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A Necking Die with Reduced Necking Instability Tendency

A shrinking and trending technology, applied in forming tools, metal processing equipment, manufacturing tools, etc., can solve the problems of scrapped parts, easy instability of the lower half of the blank, waste of materials, etc., to achieve strong shrinkage ability and save molds. Capital investment, the effect of reducing the contact area

Active Publication Date: 2020-06-09
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the technical problem that the lower half of the blank is prone to instability, scrapping of parts and waste of materials existing in the existing shrinking die, and to provide a shrinking die that reduces the tendency of shrinking instability

Method used

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  • A Necking Die with Reduced Necking Instability Tendency
  • A Necking Die with Reduced Necking Instability Tendency
  • A Necking Die with Reduced Necking Instability Tendency

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Such as image 3 and Figure 5 As shown, in this embodiment, a necking die that reduces the tendency of necking instability is based on the fact that the generatrix of the inner wall of the necking die 1 is a curve, and multiple transverse annular grooves are set on the inner wall of the necking die Groove 2, the ratio of the height H of the inclined wall of the inner wall of the shrinking die to the height L of the transverse annular groove is the straight-to-space ratio H / L, the straight-to-space ratio is 1:1.2, and the depth t of the transverse annular groove 2 is 2mm . The number of transverse annular grooves 2 can be 5-10 in the height dimension of the shrinking die.

Embodiment 2

[0027] Such as Figure 4 and Figure 5 As shown, in this embodiment, a necking die that reduces the tendency of necking instability, on the basis that the generatrix of the inner wall of the necking die 1 is a straight line, multiple transverse annular grooves are arranged on the inner wall of the necking die Groove 2, the ratio of the height H of the inclined wall of the inner wall of the shrinking die to the height L of the transverse annular groove is the straight-to-space ratio H / L, the straight-to-space ratio is 1:1.5, and the depth t of the transverse annular groove 2 is 3mm . The number of transverse annular grooves 2 can be 5-10 in the height dimension of the shrinking die.

[0028] The selection of the generatrix form of the inner wall of the shrinking die is determined according to the outer contour of the product and the machining allowance.

[0029] The straight-to-empty ratio can be arbitrarily selected in the range of 1:1-1:1.6.

[0030] The depth t of the tr...

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Abstract

The invention relates to a reducing concave die lowering the instability tendency of reducing, belongs to the technical field of light alloy plasticity shaping, and mainly aims at solving the technical problems that a present reducing concave die tends to be instable in the lower half section of a blank, cause rejection of a product and waste materials. On the basis of a bus of an inner wall of the reducing concave die, the inner wall is provided with multiple horizontally annular grooves, the ratio H / L of the height H of a separated inclined wall of the inner wall of the reducing concave dieto the height L of the horizontally annular grooves ranges from 1:1 to 1:6, and the depth t of the horizontally annular grooves ranges from 0.5 to 3mm. The reducing concave die is suitable for different types of non ferrous metal and ferrous metal, and is wide in application range.

Description

technical field [0001] The invention relates to a necking die which reduces the tendency of necking instability and belongs to the technical field of plastic forming of light alloys. Background technique [0002] In the traditional necking process, the busbar form of the inner wall of the necking die is basically divided into two situations, one is that the busbar of the necking die is a straight line (see figure 1 ), another shrinking die generatrix is ​​a curve (see figure 2 ). [0003] If the form of the busbar of the shrinking die is a straight line, because the inner wall of the die and the finished shrinking area of ​​the blank will be 100% in contact, so as the shrinking process progresses, the contact area between the inner wall of the die and the blank will become larger and larger. The axial pressure F transmitted by the press to the blank cylinder through the die 轴 The larger the size, the greater the possibility of instability at the lower end of the blank cy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D37/10B21D41/04
CPCB21D37/10B21D41/04
Inventor 程眉李国俊吴昂张治民王强郭为民
Owner ZHONGBEI UNIV
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