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Process method for secondary cold extrusion forming of large-diameter outer spline

A technology of extrusion forming and process method, which is applied in the field of mechanical processing, and can solve problems such as the inability to directly apply torsion shaft processing

Inactive Publication Date: 2014-03-19
JIANGLU MACHINERY & ELECTRONICS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, domestic spline cold extrusion equipment is designed for processing spline shafts of family passenger cars and large trucks. The maximum processing diameter is φ40, the modulus is 1.75, and the maximum length is 1000mm. Usually, the processing diameter is less than φ35 and cannot be directly applied. Machining on torsion shaft

Method used

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  • Process method for secondary cold extrusion forming of large-diameter outer spline
  • Process method for secondary cold extrusion forming of large-diameter outer spline

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Experimental program
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Embodiment Construction

[0024] The specific process of this method is:

[0025] 1. Preparation:

[0026] Knife: The inclined iron design is added, and the knife is designed into a wedge-shaped structure together, with a wedge angle of 0.5°. During manufacture, the cutting tool and inclined iron are ground in the same group to ensure uniform angles and engrave the same group logo.

[0027] Workpiece: The splines at both ends of the torsion shaft are finely turned according to the size before cold extrusion, with a roughness of 1.6, and surface defects such as scale and rust are not allowed;

[0028] The workpiece is spheroidized and annealed, and the hardness is 190HB~215HB;

[0029] Wedge mechanism installation: connect the wedge mechanism with the left and right brackets of the machine tool according to the requirements of the design drawing, align the engraved line with an angle ruler, and make the middle point of the left (or right) tool shaping section equal to the workpiece rotation center, and...

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Abstract

The invention relates to a process method for the secondary cold extrusion forming of a large-diameter outer spline. An inclined wedge device is designed, so that a spline forming tool (rack-shaped) can move along the radial direction of a workpiece; since the workpiece does not separate from the tool, the normal involute generating attribute is kept, so that the process system has the capability of secondary extrusion processing, the processing range of equipment is expanded and the suitability for processing large-diameter workpieces is achieved. A spherical annealing temperature area is optimized, so that the rigidity of the workpiece is remained, simultaneously the cold-extrusion plasticity of a material is improved and the processing characteristic of cold deformation is improved. As principle tests, test bar processing and batch production are carried out, the spline processing of a phi70mm workpiece is finished on cold-extrusion equipment with the maximum allowable processing diameter phi 40mm. The wedge-shaped device of the tool is designed by adopting the method, a carbon-alloy-steel spherical temperature area in the workpiece is optimized, and the fatigue resistance of a torsion shaft of the spline is enhanced by 28%-32%.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and in particular relates to a secondary cold extrusion forming process for large-diameter external splines. Background technique [0002] The spline shaft is a part that transmits torque between shafts in the mechanical transmission system. It has the characteristics of high connection strength, compact structure, and convenient assembly and disassembly. Spline processing usually adopts cutting methods, such as milling, hobbing, broaching, etc. [0003] The characteristics of spline connection, such as high strength, compact structure, and convenient loading and unloading, are also used in some special fields: torsion shafts are widely used in the action parts of military armored vehicles. The diameter of the inner part is smaller than that of the splines at both ends, and it transitions to the spline end with a circular arc. [0004] When the torsion shaft is used, one end of the spline i...

Claims

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Application Information

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IPC IPC(8): B21C23/00B23P15/00
Inventor 周铭黄丽琴陈坚杨美花林楠
Owner JIANGLU MACHINERY & ELECTRONICS GROUP
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