19-04-2018 дата публикации
Номер: US20180104776A1
Принадлежит:
A precision forming method of a high-efficiency and near-net hollow valve blank of an engine is provided, wherein the precision performing is realized by the cross wedge rolling mold, under the rolling the metal tubing for the valve deforms, with a middle part sunken and two ends elongating, the middle part forms a stem part of a hollow valve, the two ends form disk parts to be machined, and the connection sections between the disk parts and the stem part form neck parts having arced concave faces and a frustoconical lateral face in structure, achieving better consistency among the acquired hollow valve blanks. The disk part of each acquired hollow valve preformed blank is machined by the die-forging forming mold that is matched with the disk structure of the manufactured hollow valve, the hollow valve preformed blank is directly placed in the cavities of the die-forging forming mold for forging. 1. A precision forming method of a high-efficiency and near-net hollow valve blank of an engine , comprising:Step 1: manufacturing a cross wedge rolling mold and a die-forging forming mold;Step 2: heating a metal tubing for a valve to a rolling temperature;Step 3: rolling the metal tubing for the valve that is heated to the rolling temperature by the cross wedge rolling mold to make the metal tubing for the valve change in outside diameter and elongate along an axial direction thereof to form a eudipleural hollow valve blank, wherein a symmetric line for the eudipleural hollow valve blank is vertical to an axis thereof, and the hollow valve blank has a middle part as a stem part and two ends as disk parts, and connection sections between the stem part and the disk parts as neck parts of the hollow valve blank;Step 4: segmenting the hollow valve blank along the symmetric line of the hollow valve blank to form a first hollow valve preformed blank and a second hollow valve preformed blank, both of which are the same in structure, where each of the first hollow valve preformed ...
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