Precision Forming Technology of Warm Forgings for Universal Joints

Abstract

The invention provides a universal joint warm forging precision-forming technology which comprises the following steps: providing a forging comprising a first side wall and a second side wall, wherein the included angle between the extended line of the first side wall and the second side wall is 5-7 degrees; providing a die comprising a forming ligament part; molding, wherein the forging and the die are contacted at a point C at a forming ligament opening, wherein the molding angle of the die is 8-10 degrees; forming: the forging moves downwards relative to the die, and the precision forging of the forging is finished. Compared with the prior art, products forged according to the technology provided by the invention are highly consistent in dimensional precision and have a high qualification rate.

Description

Technical field [0001] The invention relates to the field of metal precision forging, in particular to a precision forming process for universal joint warm forgings. Background technique [0002] The universal joint, also known as the sliding sleeve, is a component of the constant velocity universal joint drive device of an automobile. Constant velocity universal joints are a necessary component of automobile drive shafts. In the prior art, the production of universal joints is forged by a combination of warm, cold and precision forging, which greatly improves the efficiency of previous pure warm forging. In warm and cold precision forging, cold finishing is a key process to control the size of the inner cavity of the universal joint. Therefore, the design of the warm forging blank and the design of the cold finishing die determine the precision of the finished product, and the reasonable blank design and reasonable The cold finishing mold design is the key to producing qualifie...

AI Technical Summary

Problems solved by technology

like Figure 1A - As shown in 1C, when the forging 100 is finely formed, the forging 100 is in contact with the mold 200 at point A, and point A is higher than the forming ligament a. When the forging 100 continues to move downward, the forging 100 at B The lateral force given by the mold 200 causes the material at B to flow back. After the material is reflowed, a large deformation force and a large amount of deformation will be generated. When B of the forging 100 passes through the forming edge a, B The material at the place springs back due to the application of force. The greater the deformation force, the greater the amount of springback, resulting in a large deviation in the size of the forging, resulting in the appearance of unqualified products.

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