cutting tool replaceable cutting edge

"Cutting tool cutting edge replaceable" technical field

[001] The present invention relates to a cutting tool cutting edge replaceable mount adapted to removably inserts cutting tool on a body, and in particular, a cutting tool of replaceable cutting edge which can be used to feed milling and an cutting insert for use with the same.

Background Art

[002] As a tool for use in work of cutting a mold, or the like, is used conventionally a mill end replaceable cutting edge, in which a cutting insert is coupled mechanically to a head of a generally cylindrical tool body adapted to be rotated around it to form an edge portion.

[003] In a cutting tool cutting edge replaceable of this type, the strength of the tool head, required to support the insert fixedly, is a major concerns. The Patent literature 1 says that the resistance of the head is maintained by adjusting the relation between cross-sectional area defined by the width and thickness of the insert and a center mounting hole, and a cross-sectional area defined by the height and thickness of the insert and the bore central mounting value fits within a predetermined range, and, also, by adjusting the relationship between a thickness of a metal support, in the tool head, and the thickness of the insert, to a predetermined value or greater.

List of citation

Patent literature

[004] PTL 1: Japanese Patent 2005 - 118965 made available

Summary of the invention

[005] However, the construction described in Patent literature 1 is adapted to increase the strength of the tool head is limited be necessary relationships between components, as the ratio between the thickness of the metal support and the thickness of the insert, in a predetermined relationship and this reduces the degree of freedom in the design of the cutting tool and the insert.

[006] The present invention was developed by virtue of the circumstances described above and an object thereof is to provide a cutting tool cutting edge adapted to allow a replaceable increase in resistance of the tool head without reducing the degree of freedom of the design, as well as, a cutting insert for use therein. The present invention provides a cutting tool edge cutting tool comprising a body on which a cutting insert is removably installed, the cutting tool comprising the insert mounting seat formed on the tool body and onto which the cutting insert is mounted and a portion of top wall formed integrally with the tool body protruding toward the mounting seat insert.

[008] The tool body may comprise a plurality of mounting seats insert and a plurality of upper wall portions so as to allow a plurality of cutting inserts are mounted on the tool body and, in the upper wall portion projecting toward the mounting seat insert, another mounting seat insert may be formed thereon, adjacent the mounting seat insert.

[009] Upper wall portion can cover at least a part of the cutting insert when it is mounted on the mounting seat insert.

[0010] Upper wall portion may be formed such that an amount by which the upper wall portion protrudes over the mounting seat insert on a base end side thereof to be greater than an amount by which the upper wall portion protrudes over the mounting seat insert onto one side end attack thereof.

[0011] The cutting tool edge replaceable cutting, according to an aspect of the present invention, may comprise a screw hole formed in the mounting seat of the insert, a mounting bolt being getting screwed in the screw hole through a hole of mounting over the cutting insert when the cutting insert is mounted on the mounting seat insert, and the upper wall portion may be formed so as to not impede the glued mounting bolt screw in the borehole.

[0012] The seat mounting insert may include a bottom wall surface, and a sidewall surface and a end wall, both extending to be at right angle to bottom wall surface, and the surface of upper wall extending to be in right angle with both, the side wall surface and the surface of the end wall, and opposite the surface of the bottom wall, can be formed in the upper wall portion.

[0013]Acutting tool cutting edge replaceable, according to an aspect of the present invention, may comprise a bore of adjustment screw formed to penetrate the upper wall portion toward the mounting seat insert and when the cutting insert is mounted on the seat of the insert, an adjustment screw may be getting screwed in the borehole of adjustment screw so that the cutting insert is pressed against the seat mounting insert.

[0014] The present invention provides for a cutting insert for use in the cutting tool cutting edge replaceable as described above. The cutting insert, according to the present invention, comprises two opposing end surfaces and a circumferential side surface extending between the two end surfaces, and the circumferential side surface of the cutting insert comprises a bearing surface capable of being brought into contact with a surface of the mounting seat insert when the cutting insert is mounted on the mounting seat insert, and a crest portion of fringing of the bearing surface may be beveled.

Brief description of the drawings

[0015] Fig. 1 is the perspective view of a a ball mill end of replaceable cutting edge, according to a mode for carrying out the present invention;

the Fig. 2 is an exploded perspective view showing the structure of an end of attack end mill cutting edge replaceable, in Fig. 1;

the Fig. 3 is a plan view of the end mill cutting edge replaceable, shown in Fig. 1;

the Fig. 4 is a diagram of an assortment exaggerated wrapped by a dotted line in Fig. 3;

the Fig. 5 is a diagram of a part of the exaggerated end mill attack end cutting edge in Fig. 1 replaceable, with a cutting insert removed therefrom;

the Fig. 6 is cross-sectional view taken along line VI-VI in Fig. 4 showing a part of the end mill attack end cutting edge shown in Fig. 4 replaceable, the part being obtained by cutting the end of attack along a plane containing the axes of a mounting bolt and an adjustment screw;

the Fig. 7 is an exploded perspective view showing the structure of an end of attack end mill cutting edge replaceable according to another mode of execution of the present invention;

the Fig. 8 is a plan view showing the end of attack end mill cutting edge in Fig. 7 replaceable, with a cutting insert mounted thereon; and

the Fig. 9 is an enlarged view of a part of the end mill attack end cutting edge in Fig. 7 replaceable, with the cutting insert removed therefrom.

Disclosure such testing

[0016]Acutting tool cutting edge and a replaceable cutting insert for use in forming such structure, according to the present invention will be described herein based on modes for carrying out the present invention. Firstly, will describe an mode of performing the end mill cutting edge replaceable according to the present invention based on Fig. 1 Fig. 6.

[0017] Fig. 1 the is a perspective view showing a ball mill end cutting edge replaceable according to a mode for executing the present invention. As shown in Fig. 1, a ball mill end cutting edge 10, according to the present mode of execution, may be rotated about an axis extending to one side of end of attack to a side end of base of the bottle. To the mill end replaceable cutting edge 10 includes a body 12 crimp end serving as a tool body, and the portion thereof are installed attack four cutting inserts 14 removably. Each of the cutting inserts 14, forming an edge portion, is mounted to the end of body 12 attack crimp end 12 by a mounting bolt as described below. The cutting tool cutting edge replaceable according to the present invention is not limited to provision of a plurality of cutting inserts and can be tailored to include a single cutting insert.

[0018] The main body of ball mill end 12 is generally cylindrical and formed of high speed steel, tool steel, alloy steel, stainless steel, cemented, or the like. The body surface of ball mill end 12 is subjected to an anticorrosion treatment (with black oxide finish) or a hardening treatment (hard nitriding or plating), or the like, if necessary.

[0019] As shown in Fig. 2, four mounting seats insert 16 are formed in the head body 12 crimp end 12 such that the insert 14 can be mounted on each of the mounting seats insert 16. In addition, top wall portions are provided 18 so as to project on the respective mounting seats insert 16. Each of the top wall 18 is formed integrally with the body crimp end 12. The upper wall portion is provided for each of the mounting seats insert 16. Four seats are provided mounting insert 16 in the circumferential direction of the end mill body 12 intervals substantially the same and are also provided with four portions of top wall 18 in the circumferential direction of the end mill body 12 substantially equal intervals. However, the number of mounting seats insert 16 and upper wall portions 18 is optional. Herein, a head body 12d crimp end 12 has a diameter of 20 mm.

[0020] In addition, a hole is drilled in the body 22 tubular crimp end 12 to extend along axis A, its tool head 12 to its base end 12b; a fluid is ejected through the tubular bore. When a workpiece is machined using to the mill end 10 replaceable cutting edge, a cutting fluid supplied extemamente, air, a mist mixed cutting fluid and air, is similar, may be ejected from the head machine tool end mill cutting edge 10 replaceable within the through tubular 22.

[0021] As shown in Figs, 2 and 4, the mounting seat insert includes a bottom wall 24, and a side wall surface 26 and a surface of end wall 28, each extending at right angle to the surface of bottom wall 24 (extending vertically of the surface of bottom wall 24). The surface of bottom wall 24 is flat and parallel to a plane containing the axis A. the sidewall 26 is formed to face toward the outer circumferential side of the tool. In addition, the surface of end wall 28 is formed to intersect the sidewall surfaces 26 and to face the end of attack tool. A screw hole 30 is punched out in a central portion of the surface of bottom wall 24. A mounting bolt 32 may be getting screwed in the screw hole 30.

[0022] In connection therewith, as described above, the crimp body end 12 is provided with the upper wall portion 18 projecting on the seat insert 16. The upper wall portion 18 is provided for mounting the seat insert 16 and includes a top wall 34 located opposite the surface of bottom wall 24. The surface of top wall 34 is located opposite the surface of bottom wall 24 and extends to be at right angle to sidewall 26 and the surface of end wall 28 of the mounting seat insert 16. The upper wall portion 18, constructed as described above, covers at least a part of the cutting insert when it is mounted on the mounting seat insert 16.

[0023] Upper wall portion 18 is formed, grossly, such that the amount by which it protrudes over the mounting seat insert 16 increases from the head to the base end portion of top wall 18. that is, the upper wall portion 18 is formed such that the amount by which it protrudes over the mounting seat insert 16, on the base end side thereof, is greater than that by which the upper wall portion 18 protrudes over the mounting seat insert on the side end attack thereof. Herein, specifically, as shown in Fig. 5, one end of attack 18 upper wall portion 18 corresponding to a portion between a side end attack and a central portion of the upper wall portion 18, is formed so as to project from the side wall surface 26 of the mounting seat insert 16 toward the outer circumferential side of the tool for a substantially constant amount. In addition, a base end 18b upper wall portion 18 corresponding to a portion between the central portion side and a base end portion 18 is formed so as to project from the side wall surface 26 of the upper wall portion 18 toward the outer circumference of the tool for a progressively increasing amount of attack end side towards the side of base end. Further, the base end 18b upper wall portion 18 is formed to project from the surface of end wall 28 towards the side end attack tool. For example, the amount of projection of HL whereby the upper wall portion 18 protrudes on the side of the end of the tool may be adjusted attack around a fifth to one-third the width of the base wall surface 24 herein, is set to, approximately, l,5mm. In addition, the amount of projection h2 whereby upper wall portion 18 protrudes on the side of the base end of the tool is set larger than the amount of projection of HL on the side of the end of attack tool, and the upper wall portion 18 is adjusted such that the project, in terminal thereof, by an amount substantially equal to the width of the surface of bottom wall 24.

[0024] Upper wall portion 18, constructed as described above, includes a side surface 20 facing towards the outer circumferential side of the tool. The upper wall portion 18, particularly the side surface 20 thereof, defines a cavity 35 of chips. The cavity 35 chip is shaped so as to facilitate the generation, accommodation, and discharge of chips, particularly, discharge of chips. The cavity 35 chip is formed so as to be cut of a portion outer circumferential toward a circumferential potion body inner crimp end 12 by a distance substantially equal to the length of the mounting seat insert and, in particular, is formed such that the amount of cutout is greater on the side of the end of attack thereof. As shown in Fig. 3 Fig. 5, the side surface 20 is formed to be at right angle to wall surface 24 of the base mounting seat insert 16. As shown in Fig. 5, a portion recessed 20r is formed in a central portion of side surface 20 to prevent a head portion of the mounting bolt 32 32h contacts the side surface 20 during the operation of the mounting bolt 32. That is, the upper wall portion 18 is shaped such to not hamper the mounting bolt 32 is getting screwed in the screw hole 30. Prevent impair the glued means that, for example, upper wall portion 18 prevents at least be present over the extent of a path along which the screw advances, to not interrupt an operation that uses a tool, for example, a driver. The recessed portion may be referred to as a 20r cutting portion underneath.

[0025] Upper wall portion 18 will be described in greater detail. Any portion of top wall 18 protrudes over a seat mounting insert 16 corresponding and can, thus, cover at least a part of the cutting insert 14 on the mounting seat insert 16. In the upper wall portion 18, another seat holder assembly 16, adjacent to a seat mounting corresponding insert 16, is formed thereon. In other words, each of the top wall 18 of the body 12 crimp end is formed by the extent of surface of bottom wall 24 of one of the mounting seats insert body 16 crimp end 12 to above the seat mounting adjacent insert 16. Each of the top wall 18, constructed as described above, is a portion surrounded by the surface bottom wall 24 of a seat mounting insert 16, the surface of top wall 34 relative to another mounting seat insert 16 positioned behind the surface of bottom wall 24 in the direction of rotation of the T-tool, the side surface 20, an outer peripheral surface of the body 12c crimp end 12, and a surface of the end body 12d attack crimp end 12. thereby, the upper wall portion 18, constructed as described above, form the metal reinforcing adapted for the cutting insert 14 is supported fixed on the mounting seat 16 adjacent insert is different from that which the portion of upper wall 18 projects. The upper wall portion 18 protrudes over the mounting seat insert 16, as described above and, accordingly, the metal backing is shaped so that its thickness, that is, the distance from the surface of bottom wall 24, mounting the seat insert to the side surface 20, is constant between the side end attack and the central portion and grows progressively central portion toward the base end side.

[0026] In addition, a hole 36 of the adjustment screw is formed on side of the base end portion of the tool of top wall 18 in order to penetrate the upper wall portion 18, from the outer circumferential portion of the body 12c crimp end 12 toward the mounting seat insert 16. An adjustment screw 38 may be getting screwed in the borehole of the adjustment screw 36.

[0027] Fig. 2 shows the cutting insert 14 the replaceably mounted on the body end mill 12 constructed as described above. The cutting insert 14 is formed as, termed an insert type negative, whose two sides may be used being mounted on the mounting seat insert 16 from the inside out. The cutting insert 14 has a generally rectangular tabular form. The cutting insert 14 includes an upper surface and a lower surface 50 52 which serve as two end surfaces facing opposite directions, the lower surface facing opposite to the direction faceada 50 by the upper surface, and a circumferential side surface 54 extending between the upper surface and the lower surface 50 52. The upper surface 50 and the lower surface 52 are substantially orthogonal to the surface circumferential side 54, respectively. The upper surface 50 and the lower surface 52 may be used as the lower surface and the upper surface, respectively. Herein, for understanding easily from the cutting insert 14, the disclosure of which is based on the relationship illustrated in Fig. 2. you locate the terms "upper" and "lower" do not limit the direction and construction of the cutting insert 14. In the cutting insert 14, a mounting hole 56 is formed therein in order to penetrate the cutting insert 14 in its thickness direction, that is, between the upper surface and lower surface 50 52. Forms the upper surface 50 and the bottom surface 52 is symmetrical. The cutting insert 14 is formed of cemented, cermets, ceramic, or the like.

[0028] As shown in Fig. 2, the cutting insert 14 includes rake faces, faces and edges 60 flank cutting 62, each formed in a crest portion of intersection between the rake face 58 and the face 60 flank. Two rake faces 58 are formed on each of the top and bottom surfaces 50 and 52 that are generally rectangular. Each of the faces flank 60 is formed on the circumferential side surface 54 at right angle to corresponding rake face 58. Two cutting edges 62 are provided on each of the top and bottom surfaces 50 and 52 of the cutting insert 14. Cutting edges 62 are arranged so as to be rotatably symmetrical when viewed in a plan view of a direction opposite the upper and lower surfaces and are also arranged to exhibit the same manners when body insert 20 is rotated from the inside out. The present invention is not limited to the plurality of cutting edges provided on the insert and one or any other number of cutting edges can be provided on the insert. In addition, the cutting edges need not be provided on both surfaces of the insert, but can be provided exclusively on a surface.

[0029] In addition, a seat surface (bearing surface) 64 formed on a flat surface is provided on each of the top and bottom surfaces 50 and 52 of the cutting insert 14. the cutting insert 14 to the positioned relative to the mounting seat insert 16 whereby the surface of seat 64 is mounted on the surface of bottom wall 24 of the seat mounting insert 16. The mounting bolt 32 is inserted in the borehole 56 in mounting cutting insert 14. In addition, interlocking holes 66, in form of circular truncated cones, each formed top and bottom surfaces of the cutting insert 14 near a corresponding corner surfaces. One end of the adjustment screw 38 attack 38 may be fitted to each of the fitting holes 66.

[0030] Furthermore, bearing surfaces 68, each formed by a planar surface, are provided on the side surface 54 of the circumferential cutting insert 14. When the cutting insert 14 is mounted on the mounting seat cutting 16, bearing the contact surface 68 may contact the sidewall surface 26 of the mounting seat insert 16. The end edges of the bearing contact surface 68, that is, marginal gingival crest portion thereof, are beveled. These portions 70 subjected to chamfer may, hereafter, be referred to as chamfered portions. Beveled portions 70, for example, planar bevels are formed with an angle of chamfer of 45° and a width of 0.2 1.0 mm chamber.

[0031] Further, a Juggernaut chip adapted to break chips flowing outward on the chopping appropriate small or the like is applied to the rake face 58 cutting insert 14.

[0032] When the cutting insert 14, constructed as described above, is mounted on the mounting seat insert 16, a cutting edge 62 fixed on the outer circumferential side end body attack crimp end 12 can be used for the cutting work. If this cutting edge 62 is used for cutting or the like is damaged, the cutting insert 14 is rotated around the center axis of the mounting hole 56 or rotated from the inside out. This allows the cutting edge 62, fixed on the outer circumferential side end body attack crimp end 12, is replaced with the another cutting edge 62. in this manner, the cutting insert 14 is indexable.

[0033] As mounting bolt 32, a common Phillips head screw, countersunk head screw or the like can be used. In addition, as the adjustment screw 38, for example, may be used a screw tip bore with the end of attack 38 shaped like a truncated cone, generally circular.

[0034] The operation of the mill end cutting edge constructed as replaceable given in accordance with the present mode of realization will be described herein below.

[0035] In ball mill end of replaceable cutting edge 10, according to the present mode of realization, the cutting insert 14 is inserted into the mounting seat insert 16 so as to be impinged (so as to be in contact with backup) in sidewall 26 and on the surface of the end wall 28 of the mounting seat insert 16. Next, with one of the surfaces of seat 64 seated on the bottom wall surface 24 of the seat mounting insert 16, the mounting bolt 32 is getting screwed in the screw hole 30 within the through mounting 56 in the cutting insert 14. In this manner, the cutting insert 14, serving as an edge portion, is mounted on the mounting seat insert body 16 crimp end 12.

[0036] Next, the base body 12b end crimp end 12 is mounted onto a spindle of a milling tool through a double. To the mill end replaceable cutting edge 10 is fed in a direction intersecting the axis the contacted a workpiece, such as steel attached on a table of the milling tool, while being rotated around the axis in a direction of rotation shown by reference character T in Figures relevant. Thus, parts of the milling and the like, strict mode for molds, can be cut using to the mill end replaceable cutting edge.

[0037] If the cutting edge 62 of the cutting insert 14 arrayed on the outer circumferential side of the head of the mill end cutting edge 10 used replaceable becomes damaged along with the cutting, the cutting insert 14 is temporarily removes from the mill end replaceable cutting edge 10, rotated around and mounted, again, in the mill end replaceable cutting edge 10. Specifically, the cutting insert 14 is rotated rotated around the center axis of the mounting hole 56 or rotated from the inside out. Thus, the cutting edge 62 in use can be substituted for the unused cutting edge 62. accordingly, cutting can be continued using the cutting insert 14.

[0038] In addition, as described above, the upper wall portion 18 that forms the metal reinforcing overhangs the seat mounting insert 16 and, thus the thickness of the metal reinforcing layer may be increased by an amount equal to the amount of the projection whereby the upper wall portion 18 protrudes over the mounting seat insert 16. Hence, the strength and rigidity of the tool head are enhanced. This construction also exerts the effect below. When, in order to increase the efficiency of cutting, cutting is carried out with high feed velocity of the end mill cutting edge 10 replaceable increased, the amount by which each cutting insert 14 is fed, possible chatter vibration can be inhibited even if a heavy load is placed on the tool. As a result, even if it is used for cutting high feed, possible damage of the cutting edge 62, possible breakage of the edge portion, possible breakage of the tool, and the like can be avoided, allowing, in this way, increasing tool life. This also allows for the quality of a surface milling is enhanced.

[0039] In addition, to the mill end replaceable cutting edge 10, according to the present mode of performing includes upper wall portion 18 and allows the strength of the tool head is increased as compared to the conventional end mill without upper wall portion 18. this allows an increase in the number of mounting seats insert 16 formed on the body as a result of end mill 12 ., the number of cutting inserts (the number of cutting edges) installed on the body crimp end 12 can be increased to further increase the feeding speed of the end mill cutting edge 10 replaceable, thus, highlighting, further, the cutting efficiency of.

[0040] Further, when the cutting insert 14 is mounted on the mounting seat insert 16, a part of the cutting insert 14 is covered with top wall portion 18. specifically, the cutting insert 14 is mounted on the mounting seat insert 16 such that the cutting edge 62, face 58 rake, and the face of flank 60 that differ from those arranged on the outer circumferential side head body crimp end 12 is used for cutting, are involved by the surface bottom wall 24, surface of the sidewall 26, and end wall surface 28 of the mounting seat insert 16 and by the surface top wall 34 of the upper wall portion 18. thereby, even if chips coarse flowed out when carried out high cutting power, the cutting edge 62 and other components that are not involved in the cutting may be prevented from being damaged as a result of scratches or collision of the chips. In particular, upper wall portion 18 completely covers and protects the cutting edge arranged in an unused position such that the cutting edge 62 and the unused cutting edge 62 in use are rotatably symmetrical with respect to the central axis of the bore 56. This prevents the cutting edge 62 unused damaged during use of the single cutting insert. Accordingly, all cutting edges 62 of each cutting insert 14 may be used reliably, taking, as such, to the mill end 10 and the cutting inserts 14 economically excellent.

[0041] In addition, with the cutting insert 14 positioned in a cavity defined by insert mounting seat insert 16 and upper wall portion 18 so that moving the cutting insert 14 be limited to some extent, an operator may screw the mounting bolt 32 in the borehole 30 within the through 56 in the cutting insert 14. Thus, even if, for example, the cutting insert is small-sized, the operator is prevented from dropping the cutting insert 14, or the mounting bolt 32, during assembly of the cutting insert. Hence, when the cutting edge 62 is substituted or the cutting insert 14 is replaced, the end mill 10 is excellent in operability of the cutting insert 14 and the mounting bolt 32.

[0042] In addition, in the end mill 10, base end portion top wall 18, the amount of projection of the upper wall portion 18 is increased to reinforce the strength of the end of attack tool. The amount of projection of the upper wall portion 18 is adjusted lower between end of attack and the central portion of the upper wall portion 18 to ensure sufficient volume cavity to the chips. Thus, in the end mill 10, may be acquired excellent characteristics for excluding chips, with the resistance end attack tool, is similar, increased.

[0043] Further, the surface of bottom wall 24 of the mounting seat insert 16 and the surface of top wall 34 are parallel thereto the plane containing the axis, and the mounting seat insert 16 and the surface of top wall 18 are provided so that the sidewall 26 and the surface of end wall 28 are at right angle to surface of bottom wall 24 and the upper wall surface 34. Thus, the mounting seat insert 16 may be milled at a time that the direction of diameter of the tool is at right angle with the axis A. therefore, the crimp body end 12 can be easily manufactured in a short period of time. Accordingly, the form of the upper wall portion 18 can also be set freely. In addition, the side surface 20 of the top wall portion 18 is provided to be in right angle with the surface of bottom wall 24 and the wall surface 34 of the upper mounting seat insert 16, and this prevents the direction in which the seat assembly is machined insert 16 interfering with the direction in which the cavity is machined chip. As a result, the shape of the well chip can also be set freely.

[0044] In addition, according to the mill end replaceable cutting edge 10, according to the present mode of realization, the adjustment screw 36 is formed in the upper wall portion 18 of the end mill body 12, and the cutting insert 14 is provided the bore sleeve 66 adapted to fit in the end of the adjustment screw 38 attack 38. In this manner, the cutting insert 14 is pressed toward the surface of properly bottom wall 24 of the insert mounting seat 16 using the mounting bolt 32 for mounting the cutting insert 14 mounting the seat insert 16, and screw the adjustment screw 38 in the borehole of adjustment screw 36 to mate the end 38 of the attack adjustment screw 38 wellbore fitting 66 in the cutting insert 14. Hence, the squeezing force increases to lead to seat surface 64 of the cutting insert 14 for intimate contact with the surface of bottom wall 24 of the seat mounting insert 16. Accordingly, the cutting insert 14 is tightly secured to the body of end mill 12. this prevents the situation the following even during cutting power high with a heavy load placed upon the tool: the cutting insert 14 rises the surface of bottom wall 24 of the mounting seat insert 16 and, as such, is loosened or displaced from the surface of bottom wall 24. This allows the prevention of, for example, possible vibration of jerking or to damage to the cutting edge 62, during cutting, caused by insufficient rigidity of the cutting insert mounting 14.

[0045] In addition, in end mill cutting edge replaceable 10, according to the present mode of realization, the cavity 35 chip is formed so as to be cut out of the circumferential portion to the outermost circumferential portion body inner crimp end 12, particularly such that the amount of cutout is greater on the side end body attack crimp end 12. thereby, is provided a sufficient space in the direction in which the chips flow off, allowing for acquired excellent feature for disposal of chips. Further, a space is provided above the screw hole 30 preventing upper wall portion 18 is an obstacle to assembly and disassembly of the mounting bolt 32. In addition, the upper wall portion 18 with the cut out portion 20r taking to the mill end 10 excellent the operability of the mounting bolt 32.

[0046] In addition, to the mill end replaceable cutting edge 10, according to the present mode of realization, adopts the insert type in which negative, upper and lower surfaces 50 and 52 are at right angle to side surface 54. As such, compared to an insert of a positive type wherein a surface top and a bottom surface cmzam a side surface at an acute angle, the cutting insert 14 is excellent strength of the insert itself. Once the cutting insert 14 is constructed as described above, the surface of seat 64, serving as a mounting surface mounted on the body crimp end 12, may have a large area. Hence, the cutting insert mounting has excellent stability.

[0047] In addition, the cutting insert 14 is provided with beveled portions 70 along the crest portion of the bearing surface 68 marginal gingival thereof. In this manner, during assembly and cutting the cutting insert 14, the cutting insert is prevented from being damaged, for example, contact of the crest portions of the bearing surface 68 marginal with the respective wall surfaces of the mounting seat insert 16. This eliminates the need to perform cutting down upon a corner portion in which the surface of bottom wall 24 and the side wall surface of the mounting seat insert intersect and a corner portion in which the surface of top wall 34 and the sidewall 26 intersect, in order to prevent damage to the cutting insert by contact with portions of the marginal ridges bearing surface 68 and the seat mounting insert 16 or upper wall portion. Hence, the seat mounting insert 16 can easily be milled exclusively from a direction orthogonal to the axis of tool diameter for A. accordingly, in milling insert mounting seat, interference with milling the cavity chips also need not be taken into consideration. Thus, the crimp body end 12 can be easily manufactured and is suitable for mass production, and may be in a short period of time, the cost low. In addition, portions 70 are provided on the beveled bearing surface 68 arranged on the outer circumferential side of the head body end mill 12, and this allows the cutting insert 14 and the end mill body 12 are prevented from being damaged, for example, cutting chips.

[0048] Further, the Juggernaut chips or the like is provided on the face 58 of the rake cutting insert 14 and, thus, even if the cutting insert 14 is mounted on the end mill body 12 such that the rake angle is negative, the resistance to cutting can be reduced.

[0049] To the mill end replaceable cutting edge 10, in accordance with the mode for carrying out the present invention has been described. However, various changes can be made to the mill end replaceable cutting edge 10. For example, in end mill cutting edge replaceable 10 described above, the cutting insert 14 is mechanically mounted on the body end mill using the mounting bolt, but the cutting insert 14 can be mechanically mounted on the body end mill 12 using other mechanical means. In addition, the present invention does not exclude mounting chemical cutting insert on the tool body using chemical means.

[0050] Further, for example, the form of the upper surface 34 of the upper wall portion 18 is not particularly limited, and the surface of top wall 34 may have any other form. The amount H of projection of the upper wall portion 18 can be adjusted appropriately. Preferably, substantially, the amount of projection of HL on the side end of the tool is adjusted attack relatively small, while the amount of projection h2 end on the side of the base of the tool is set larger than the amount of projection of HL. However, the amount of projection onto the side end attack of the tool may be the same as the amount of projection on the base end side of the tool. For example, the amount of the projection on the base end side of the upper wall portion 18 may be equal to or greater than half the width of the surface of bottom wall 24. In addition, for example, the amount of projection onto the side end wall portion attack top 18 may be the same or less than the half the width of the surface of bottom wall 24.

[0051] In addition, in the execution, upper wall portion 18 projecting mounting the seat insert 16 covers a part of the insert 14 mounted on the mounting seat insert 16. However, it is possible that the upper wall portion 18 does not cover any part of the insert 14 mounted on the mounting seat insert 16. Even in this case, the upper wall portion 18 protrudes over the mounting seat insert to contribute to increase the thickness of the metal backing by an amount equal to the amount of projection of the upper wall portion 18.

[0052] In addition, to the mill end cutting edge 10 adopts the following mechanism replaceable pressure. The bore of adjustment screw 36 is formed in the upper wall portion 18 of the body 12. end crimp fitting the bore 66 is formed in the cutting insert 14. the adjustment screw 38 is used, then, for pressing the cutting insert 14 against the seat mounting insert 16. However, the present invention is not limited to this mechanism. The pressure mechanism need not be adopted. Further, another mechanism of pressure may be used in place of the pressure mechanism using the adjustment screw 38.

[0053] Further, the form of the side surface of the upper wall portion 18 is not particularly limited to that of the lateral surface of the ball mill 20 end replaceable cutting edge 10, according to the mode of realization described above. Any different form than the side surface 20 can be adopted as the form the side surface of the upper wall portion 18.

[0054] Furthermore, in end mill cutting edge 10 replaceable, the crimp body end 12 is provided with the bore 22 through which a tubular cutting fluid or the like is ejected so as to remove chips and cool the cutting edge and a cutting area. However, the present invention is not limited to this aspect. For example, a cutting fluid or the like may be bathed exterior of the body crimp end 12 without any tubular bore formed in the body crimp end 12.

[0055] In addition, the mode of realization described above adopts the insert type negative in which upper and lower surfaces are angled straight with the side surface and having a tabular form, generally rectangular. However, altemativamente, an insert of a positive type may be adopted, in which the upper surface and the lower surface intersects the side surface at an acute angle. Altemativamente, adopted an insert formed of a flat plate formed as a polygon, such as a triangle, a rectangle, a pentagon, or a hexagon.

[0056] Further, in the testing described above, the bolt holes 66 are formed fitting near the corners of each of the respective top and bottom surfaces of cutting insert 14. However, positions, the number, or similar fitting bores 66 are not particularly limited. In addition, the form of the fitting hole 66 is not particularly limited. For example, when using screws round tip, generally hemispherical seat bolt holes may be adopted in place of the bolt holes formed as truncated cones fitting, usually circular.

[0057] In addition, in insertol4, according to how the testing described above, chamfered portions 70 formed flat beveled surfaces are provided by chamfer of the crest portion of the bearing surface 64 fringing of the cutting insert 14 in 45 degrees. However, the cutting insert according to the present invention is not limited to this aspect. Altemativamente, the chamfered portion may be a chamfered portion formed a beveled surface generally circular. Altemativamente, this chamfer may be omitted. If the chamfer is carried out, the width of the chamfered surface is adjusted, preferably, within the range of 0.2 mm or larger and smaller l,0mm or. A width of beveled surface less than 0.2 mm can prevent expected effects are exerted. A width of beveled surface greater than l,0mm reduce the contact surface area backup 68 and, thus, the rigidity of mounting of the insert.

[0058] Further, in the above described testing, the Juggernaut chip or the like is provided on the face 58 of the rake cutting insert 14. However, altemativamente, the Juggernaut chip or the like may be omitted from the cutting insert.

[0059] Now, a ball mill end of replaceable cutting edge 10, in accordance with another mode of execution of the present invention, constructed unlike the end mill cutting edge 10 will be described based on replaceable Fig. 7 Fig. 9. primarily, will be described the differences between the mill end 100 and replaceable cutting edge to the mill end replaceable cutting edge 10.

However, the description below, components of the mill end cutting edge 100 that are the replaceable. same as those of the end mill cutting edge replaceable 10 are denoted by the same reference numerals, and duplicate descriptions of these components are omitted. These changes, as described for the mill end replaceable cutting edge 10, can be applied to the mill end replaceable cutting edge 100, as in the case of end mill cutting edge 10 replaceable, insofar as no inconsistencies in the resulting structure. To the mill end replaceable cutting edge 100, which these changes were applied, may exert effects similar to those of the end mill cutting edge 10 replaceable.

[0060] As shown in Fig. 8 and Fig. 9 in, in end mill cutting edge 100 replaceable, upper wall portion 18 is formed such that the projection amount H of wall portion 18 increases progressively upper side end attack sides end of seat base mounting insert 16. In this case, a large space is provided on the side end attack tool takes mill end cutting edge replaceable excellent to allow chips are discarded.

[0061] In addition, unlike the end mill cutting edge 10 replaceable, to the mill end cutting edge 100 prevents the adoption of the replaceable pressure mechanism for pressing the cutting insert 14 against the seat mounting insert 16 using the adjustment screw 38. That is, in the mill end replaceable cutting edge 100, the crimp body end bore 12 does not include the adjustment screw 36, and the cutting insert 14 does not include interlocking the bore 66. compared to the mill end replaceable cutting edge giving the pressure mechanism, to the mill end cutting edge replaceable 100 increases the degree of freedom for the design of the cavity and chip form Juggernaut. This allows, further, a reduction in the cost of manufacture of the end mill 100, having for result a ball mill end 100 of low cost.

[0062] Further, as shown most clearly in Fig. 8, in end mill cutting edge 100 replaceable, the form of the upper wall portion 18 is defined such that, the chip cavity 35 has a volume large enough to prevent the head portion of the mounting bolt 32 32h contacts the wall surface 20 during the operation of the mounting bolt 32. As such, the upper wall portion 18 of the end mill cutting edge 100 does not include replaceable portion recess 20r. However, as shown in Fig. 7, the upper wall portion 18 includes the recessed portion 102 on the side surface 20 thereof. The recessed portion 102 allows an increase in the amount of projection of the upper wall portion 18 and, as such, in the thickness of the metal reinforcement to enhance the strength of the tool head while allowing for an increase in the cavity volume chip 35. Accordingly, to the mill end cutting edge 100 has excellent replaceable feature for disposing of chips.

[0063] The cutting tool cutting edge and the replaceable cutting insert for use in forming such structure, according to the present invention, have been described considering the mill end cutting edge and the replaceable cutting insert for use in forming such structure, as an example. However, for example, the present invention is applicable to, beyond the end mill, which is a rotating tool, other rotary tool replaceable cutting edge, such as a milling cutter, a countersink, a drill, and a hole cutter. The present invention is also applicable to cutting tools of replaceable cutting edge used for rotating a workpiece with a tool fixed drilling.

[0064] Modes for carrying out the above described and modifications thereof have been described with a certain degree of specificity. However, the present invention is not limited to the modes for carrying out and modifications described above. It should be noted that various changes or changes can be made to the present invention without departing from the spirits and scope of the invention set forth in claims. That is, the present invention includes any modifications, applications, and equivalents encompassed by the concepts of the present invention defined by the claims.