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Method for manufacturing thin-wall cylindrical member necking die

A manufacturing method and technology of thin-walled tubes, applied in the field of mold manufacturing, can solve problems such as the instability of workpieces, and achieve the effects of high production efficiency, good quality and simple operation

Active Publication Date: 2012-08-15
THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the fact that hot-rotation compression is generally used in the multi-pass necking of thin-walled cylindrical parts, the workpiece is prone to instability. Therefore, a method that can improve the quality of the workpiece after multi-pass necking , it is very necessary to ensure the flatness and no deformation of the bottom of the thin-walled cylindrical parts, and the mold with the same height and size

Method used

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  • Method for manufacturing thin-wall cylindrical member necking die
  • Method for manufacturing thin-wall cylindrical member necking die
  • Method for manufacturing thin-wall cylindrical member necking die

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specific example

[0109] For a specific example, the shrinking coefficient and the shrinking pass are calculated with nine-pass shrinking parameters.

[0110] There is a cylindrical aluminum workpiece with a wall thickness of 2mm and a diameter of Φ80mm (M=0). It is required to shrink to Φ50mm. Calculate and determine the number of shrinkage passes n and the shrinkage coefficient mi of each pass and the shrinkage of each pass. Diameter di behind the mouth.

[0111] calculation steps:

[0112] 1. Find the total shrinkage coefficient: known: D=Φ80; d=Φ50;

[0113] According to the formula:

[0114]

[0115] 2. Find the average shrinkage coefficient:

[0116] According to the empirical data, m level = 0.945~0.960; according to the selection principle of m level, a. the material is thicker; b. the cylinder diameter is smaller. Therefore choose m 平 =0.945.

[0117] 3. Find the total number of necking passes n:

[0118] According to the formula: where: m 总 = 0.625; m 平 =0.945.

[0119]...

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Abstract

The invention relates to a method for manufacturing a thin-wall cylindrical member necking die, which comprises the following steps of: 1. precisely calculating and confirming reasonable necking coefficients and necking passes, wherein the step 1 has the key of well distributing the necking coefficients of all passes, to be used as a theoretical basis of necking die preparation; 2. scientificallyand reasonably designing a multipass necking die structure to ensure easy material selection and processing manufacture; 3. establishing a feasible processing manufacture process to ensure the manufacture precision of the necking die; and 4. designing an installation structure of the die on an automatic necking press to ensure the positioning precision of the die. The die of the invention has theadvantages of simple manufacture method, scientific and reasonable design, convenient installation and use and durability, and the invention can effectively ensure the quality of a thin-wall heterogenic cylindrical member during multipass necking, and is a novel method for manufacturing the multipass necking die and particularly suitable for various thin-wall cylindrical members during necking.

Description

[0001] Field of study [0002] The invention belongs to the field of mold manufacturing, and relates to the mold manufacturing of thin-walled cylindrical parts, in particular to a manufacturing method of a shrinking mold for thin-walled cylindrical parts. Background technique [0003] The thin-walled cylindrical parts are made of aluminum, because of their light weight and low relative strength. During the multi-pass shrinking pressure processing, if the mold preparation is not good, it is easy to cause instability and deformation of the workpiece, resulting in the occurrence of the bottom of the thin-walled cylindrical parts. deformation, and even scrapping; and the height and dimensional consistency of thin-walled special-shaped cylindrical parts are required to be high, so the design and manufacture of molds is very important. [0004] In view of the fact that the hot-spin compression port is generally used in the multi-pass shrinking of the current thin-walled cylindrical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D37/20B21D41/04
Inventor 赖军绳以健王修行张孝云崔岩孙树勋
Owner THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME
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