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

A technology of processing precision and external joints, applied in metal processing equipment, metal extrusion forming tools, metal extrusion, etc., can solve the problem of unstable gap between the punch and the die and the inability to accurately guarantee the size of the die mouth , can not guarantee the high precision of the mold and other problems, to achieve the effect of simple processing method, suitable for popularization and application, and enhance the corporate image

Inactive Publication Date: 2017-12-01
JIANGSU SUNWAY PRECISION FORGING
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 product

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

Examples

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Example Embodiment

[0025] A method for improving the processing accuracy of the external joint reverse extrusion die, including the following steps:

[0026] For sawing, according to the total length of the finished product, there is a margin left at both ends of the blank from the die steel raw material bar; specifically, according to the total length of the finished product, a margin of 5-10mm is left from the die steel raw material bar. Saw the blank up.

[0027] For rough turning, the blank is roughed according to the total length of the finished product with a margin left at both ends. Specifically, the blank is roughed according to the total length of the finished product with a margin of 0.5-1 mm at both ends.

[0028] Quenching, heat treatment of the rough-turned mold to increase the hardness of the material and improve the performance of the mold.

[0029] Finish turning, the mold is processed according to the set size.

[0030] For rough milling, the shape is milled by leaving a margin along th...

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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;...

Claims

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Application Information

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IPC IPC(8): B23P15/24B21C25/10
CPCB23P15/24B21C25/10
Inventor 姚杨华袁海兵王维张卫
Owner JIANGSU SUNWAY PRECISION FORGING
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