Method for improving machining precision of reverse extrusion female die of outer joint

Abstract

The invention discloses a method for improving machining precision of a reverse extrusion female die of an outer joint. The method is characterized by comprising the steps of sawing-rough turning-quenching-finish turning-rough milling-pressing fit-finish milling. The pressing fit step is additionally arranged before the finish milling step is executed to improve the final state and size progress of the die; the die is finely milled after pressing fit, and can be directly put into use after finish milling, that is, once molding is achieved during finish milling, so that the inner cavity size precision of the finished die is higher; the inner cavity size and the punch guide part are machined at the same time during finish milling; and the two parts are once molded to guarantee coaxiality of the two parts on machining.

Description

technical field [0001] The invention belongs to the technical field of die processing, and more specifically relates to a method for improving the processing accuracy of an external joint reverse extrusion die. Background technique [0002] At present, the technology used in the internal and external joints of Honda automobile gearboxes is compared with that of other countries. It requires that the inner cavity of the ballway is not ground, so the machining accuracy of the blank is required to be very high, so the corresponding forming die has a higher machining accuracy. There are also high demands. [0003] The existing die processing process is: sawing → rough turning → quenching → fine turning → fine milling → grinding → press fit. However, the above process has the following problems: (1) Since the press fit is an interference fit, the size of the inner cavity will change during the press fit, so that the high precision of the mold after press fit cannot be guaranteed;...

AI Technical Summary

Problems solved by technology

However, the above process has the following problems: (1) Since the press fit is an interference fit, the size of the inner cavity will change during the press fit, so that the high precision of the mold after press fit cannot be guaranteed; (2) During forging production, since the size of the cavity of the die cannot be accurately guaranteed, the gap between the punch and the mating part of the die is unstable, which makes it difficult to control the coaxiality of the inner cavity of the produced product compared to the outer shape

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