Sedan gear-box axle piece cold finish-forging formation method and die

Abstract

The invention relates to a cold precision forging and forming method for car gear-box shafts and a die thereof, which belong to a metallic material plastic forming method and a die, and solve the problems that the prior process material has low utilization rate, dimensional precision and surface quality and has the strength incapable of meeting requirements. The method comprises the steps of preparing materials, determining the process, blank treatment and progressive forming. The die comprises an upper die holder and a lower die holder, an upper ejection device and a lower ejection device, five pairs of die units and fastening devices thereof; each pair of die units comprises an upper die and a lower die; the upper die consists of an upper sleeve, an upper shim plate, an upper support cylinder, an upper cushion cover, an upper concave die and an upper pressure ring; and the lower die consists of a lower sleeve, a lower shim plate, a lower support cylinder, a lower cushion cover, a lower concave die and a lower pressure ring. The method has the advantages of reasonable and stable process flow and high production efficiency; the die has the advantages of convenient manufacture, installation, use and maintenance, reliable work and long service life; and the dimensional precision, the surface glossiness and the strength of the produced shafts are improved.

Description

technical field [0001] The invention belongs to a metal material plastic forming method and a mold, which are used for the production of car gearbox shaft parts. Background technique [0002] In recent years, domestic die forgings for truck gearbox shaft parts are produced by hot die forging process. The process route is blank heating → flattening (or roll forging) → pre-forging → final forging → edge trimming, see literature: " Forging Die Design Manual" (2nd Edition), Machinery Industry Press, 2006: 301, 308-309; the process is an ordinary hot die forging process, with many processes, the material utilization rate is generally 75% to 80%, and the forging allowance Large, the diameter tolerance is 1.0 ~ 1.5mm, and the surface is a free surface. Liang Jicai and Liu Huamin proposed that the production method of stepped shaft forgings for automobile gearboxes is the cross wedge rolling process, and the process route is blank heating → cross wedge rolling forming. Technology ...

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Problems solved by technology

[0005] The invention provides a cold precision forging forming method for car gearbox shaft parts, and provides a mold for the process, which solves the problems of low material utilization rate, low dimensional accuracy and surface quality in the existing common die forging process and cross wedge rolling forming process. Problems that are not high and the strength cannot meet the requirements

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