Method for manufacturing drag reduction surface

The invention belongs to the technical field of micro-nanometer manufacturing and relates to a method for manufacturing the surface with resistance reduction. Micron level structure arrays in alternate arrangement are designed and manufactured on the surface of a silicon substrate, a silicon dioxide substrate, an engineering plastic substrate or a metal substrate; an ultraviolet stamping photoetching technology is used as a transferring means; a template can be repeatedly used; a fluorination process is used as a surface treatment means to obtain a microstructure substrate with the function of resistance reduction; and the microstructure surface of the substrate has quite low surface energy. The method can be used for the surface of a device for a micro-electromechanical system, and can reduce the surface friction and abrasion as well as the invalidation of adhesion under a microscale; the method can be used for the surface of a conveying pipeline and a microflow device, can reduce the ...

A low-alloy high speed steel roll material and a manufacturing method thereof

Manufacturing method of core for casting engine exhaust manifold

The invention relates to a manufacturing method of a core for casting an engine exhaust manifold, comprising the following steps of: 1, manufacturing a resin assembly mould by a photo curing fast-shaping technique; 2, manufacturing reinforcing iron wires in shape of spatial spiral curve same as the core; 3, filling sands in the mould and putting into the reinforcing iron wires manufactured in the step 2; 4, scraping resin sands along a mould sectional surface by a scraper to make the resin sands protrude a little, and then folding the mould to press tightly; 5, opening the mould to take out the core and carrying out the proper post-treatment on the core after the resin sands are solidified. In the invention, the complex core resin assembly mould manufactured by the fast-shaping method has light weight and good strength, and the surface roughness thereof can also achieve Ra=3.2mum; therefore, in the premise of guaranteeing the quality of the manufactured core, the manufacturing cost and ...

Casting high speed steel cutter and preparation method thereof

Manufacturing method of core for casting engine exhaust manifold

The invention relates to a manufacturing method of a core for casting an engine exhaust manifold, comprising the following steps of: 1, manufacturing a resin assembly mould by a photocuring fast-shaping technique; 2, manufacturing reinforcing iron wires in shape of spatial spiral curve same as the core; 3, filling sands in the mould and putting into the reinforcing iron wires manufactured in the step 2; 4, scraping resin sands along a mould sectional surface by a scraper to make the resin sands protrude a little, and then folding the mould to press tightly; 5, opening the mould to take out the core and carrying out the proper post-treatment on the core after the resin sands are solidified. In the invention, the complex core resin assembly mould manufactured by the fast-shaping method has light weight and good strength, and the surface roughness thereof can also achieve Ra=3.2mum; therefore, in the premise of guaranteeing the quality of the manufactured core, the manufacturing cost and the ...

Casting high speed steel cutter and preparation method thereof

A kind of cast high speed steel cutter and the preparation method of it, the chemical components used to produce it and the weight percent of them is as following: C: 0.6%-1.2%, Cr: 3.8%-4.5%, W: 5.0%- 7.0%, Mo: 5.0%-7.0%, V: 1.5%-3.5%, K: 0.002%-0.005%, Na: 0.002%-0.010%, B: 0.003%-0.010%, Ce: 0.025%-0.050%, N: 0.02 %-0.06%, Ti: 0.05%-0.15%, Si<0.8%, Mn<0.5%, P<0.05%, S<0.04 %, the other is Fe, the sum of chemical components is 100%.Electric cooker is used to produce it according to the preparation method, and blacklead model is used to cast it' s shape. The cast high speed steel cutter does not need to be forged and rolled, the technology is simple, the efficiency is high, the energy cost is low, the production cost is more than 25% lower than that to forge M2 high speed steel cutter. The rigidity and obdurability of the cutter is high, and the life of it is long, the life of it is 15.3%-24.8% longer than that of M2 high speed steel cutter, break and desquamation are not found when it ...

Low-alloy high speed steel roll material and preparation method thereof

A kind of low alloy high speed steel roller material and the method to produce it. The chemical components of it is( weight percent): C: 1.2-1.8%, Cr: 4.5-6.5%, W: 1.0-3.0%, Mo: 1.0- 3.0%, V: 3.0-5.0%, Al: 0.6-1.2%, Si: 0.8-1.2%, N: 0.05-0.15 %, B: 0.04-0.12%, Nb: 0.05-0.20%, Ti: 0.06-0.18%, Y: 0.04- 0.15%, Mn<0.5%, P<0.04%, S<0.04%, the other is Fe, and the actual content of carbon of it is: 0.033W+0.063Mo+0.060Cr+0.200V+(0.08-0.20). It is made by smelting with electric cooker, the roller is molded by centrifugal complex cast or continuous complex cast, the roller will be quenched and tempered after it has been processed rudely, and the regulated size and accuracy will fulfilled after a fine machining at last. Less Tungsten and Molybdenum element are contained in the low alloy high speed steel roller material, and it does not contain the expensive Cobalt, the production cost of it is lower, and it own high red-hardness, obdurability and abrasion resistance. This patent can improve the ...

Method for manufacturing raised grating alignment mark in imprinting lithography

The invention discloses a method for manufacturing a raised grating alignment mark in imprinting lithography, which comprises the following steps of: (1) determining a refractive grating refraction index range for acquiring high-contrast Moire fringe images, and selecting a grating material in the range; (2) photo-etching: manufacturing a grating mark mask plate, and etching a photoresist layer by using the grating mark mask plate as a mask to respectively obtain photoresist grids on an imprinting substrate and a template; (3) sputtering: sputtering on the substrate with photoresist grid lines to optimize the grating material; and (4) peeling off: peeling the photoresist area on the substrate to obtain raised grating fringes. The method optimizes the grating mark manufacturing material by adopting interface optical theory and finite difference computation. The method solves the problem that the Moire fringe alignment image contrast of the traditional mark declines seriously due to the introduction ...

Digital Moire fringe method for improving quality of Moire fringe images in imprinting alignment process

The invention discloses a digital Moire fringe method for improving the quality of Moire fringe images in an imprinting alignment process, which comprises the following steps of: (1) designing a mark; (2) collecting grating images; (3) pretreating the grating images; (4) synthesizing the Moire fringe images; and (5) pretreating Moire fringe signals. By adopting the scheme that a CCD (Charge Coupled Device) is used for collecting the grating images and digital Moire fringes are synthesized by a computer, nano imprinting alignment is carried out instead of the original method that the CCD is directly used for collecting the Moire fringe images for alignment. From the standpoint of Moire fringe formation, the method solves the problems of covering asymmetry of process layers, multi-time reflection of aligning light beams on process layer interfaces and contrast reduction of the Moire fringes in an aligning process in the traditional method as well as the problem of image alignment error caused ...

Photocuring die and method for manufacturing waxy template for precise casting

The invention relates to a photocuring die which comprises a male die and a female die, wherein cooling water channels are arranged in the male die and the female die; the cooling water channels are nonlinear cooling water channels; the cooling water channels are circular or spiral; the diameter of each cooling water channel is 5-10mm; the distance between the adjacent cooling water channels is larger than 5mm; the cooling water channels are at a distance of larger than 10mm from a die cavity surface; the thickness of the thinnest position of the die is larger than 10mm; and a demolding angleof the die is larger than 0.5 degrees. The photocuring die manufactured by a photocured molding technology has high precision and can freely design the cooling water channels according to the shape of a product and ensure that a wax template can be fully cooled during molding; and compared with the prior art, the method can efficiently and rapidly manufacture the waxy template for precise castingwithout ...

Method for manufacturing drag reduction surface

The invention belongs to the technical field of micro-nanometer manufacturing and relates to a method for manufacturing the surface with resistance reduction. Micron level structure arrays in alternate arrangement are designed and manufactured on the surface of a silicon substrate, a silicon dioxide substrate, an engineering plastic substrate or a metal substrate; an ultraviolet stamping photoetching technology is used as a transferring means; a template can be repeatedly used; a fluorination process is used as a surface treatment means to obtain a microstructure substrate with the function of resistance reduction; and the microstructure surface of the substrate has quite low surface energy. The method can be used for the surface of a device for a micro-electromechanical system, and can reduce the surface friction and abrasion as well as the invalidation of adhesion under a microscale; the method can be used for the surface of a conveying pipeline and a microflow device, can reduce the ...