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Manufacturing method of multislot eccentric workpiece and cold heading reducing die

A technology of cold heading and diameter reduction, which is applied in the manufacture of multi-groove eccentric workpieces, cold heading shrinking dies, and multi-groove eccentric bolt manufacturing. It can solve the problems of low production efficiency and high processing costs, reduce production costs, and optimize product processing. The effect of craft

Active Publication Date: 2013-11-13
FAWER AUTOMOTIVE PARTS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention discloses a method for manufacturing a multi-groove eccentric workpiece and a cold-heading shrinking die to solve the problems in the prior art that the multi-groove eccentric workpiece has chip processing milling grooves, low production efficiency, and high processing cost.

Method used

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  • Manufacturing method of multislot eccentric workpiece and cold heading reducing die
  • Manufacturing method of multislot eccentric workpiece and cold heading reducing die
  • Manufacturing method of multislot eccentric workpiece and cold heading reducing die

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Embodiment Construction

[0018] In an embodiment of the present invention, a two-groove eccentric workpiece manufacturing method is as follows figure 1 , figure 2 , image 3 Shown: the first step: cold heading, the bolt end J1, the bolt flange J2, the screw J3, the first groove J5 and the second groove J6 of the screw groove are sequentially processed at each station of the cold heading machine; the second step : thread rolling, the thread rolling machine processes the threads on the screw rod J3.

[0019] Such as Figure 4 As shown: the rod portion J3 is divided into a uniform deformation zone J7 and a uniform deformation zone J8, and a first groove J5 and a second groove J6 in a non-uniform deformation zone in the radial and circumferential direction. The first groove J5 and the second groove J6 in the non-uniform deformation area flow at different speeds relative to the uniform deformation area J7 and the uniform deformation area J8; Partial radial cold heading shrinkage deformation at the rad...

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Abstract

The invention discloses a manufacturing method of a multislot eccentric workpiece. The method comprises the following steps of: S1, sequentially and respectively processing a bolt end head, a bolt flange, a screw, a screw groove in every station of a cold header; and S2, processing threads on the screw by a thread rolling machine. The diameter of a rod part is peripherally divided into a uniform deformation area and a non-uniform deformation area. The metal of the non-uniform deformation area flows at a different speed relative to the uniform deformation area. When a workblank on the rod part of the workpiece is deformed by a cold heading groove die, the workblank of the workpiece is cold-headed, reduced and deformed locally and radially along reducing belts, and the part of metal which is locally reduced and deformed forms arc-shaped grooves after deformation. Before the rod part of the workpiece deforms, the rod part has a circular section, and after deformation, a multislot eccentric workpiece section is formed. The workblank of the workpiece is cold-headed and deformed, and slots which are equal to the reducing belts in quantity and have certain length are formed on the rod part of a part in circumferential direction. The method has the advantages that the multislot workpiece is cold-headed and formed, and the manufacturing process of products is optimized, so that the production cost is greatly lowered, and the manufacturing method is very suitable for large-scale production of fasteners for automobiles.

Description

technical field [0001] The invention belongs to the technical field of cold heading forming, and relates to a method for manufacturing a multi-groove eccentric workpiece and a cold heading reducing die; it is especially suitable for manufacturing multi-groove eccentric bolts. Background technique [0002] Eccentric bolt products are widely used in the adjustment of the chassis of various models of passenger cars. The known processing methods of multi-groove eccentric bolts are: chip milling after the thread rolling process, manual deburring of the milling grooves, low production efficiency and difficult processing. high cost. [0003] The die diameter reduction zone of the existing cold heading reduction die has a cross section perpendicular to the mold axis and is a circle uniformly distributed radially on the same circumference. The metal material that has been uniformly reduced on the surface is uniformly thinned and deformed in the radial direction on the same circumfer...

Claims

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Application Information

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IPC IPC(8): B21J13/02B21K1/54
Inventor 李兴慧
Owner FAWER AUTOMOTIVE PARTS
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