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Method for manufacturing thin-wall cylindrical member necking die

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

Active Publication Date: 2011-01-26
THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME +1
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  • Description
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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

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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] In a specific example, the necking coefficient and the necking pass are calculated with nine-pass necking parameters.

[0110] There is a cylindrical aluminum workpiece with a wall thickness of 2mm and a diameter of Φ80mm (M=0), which is required to be necked to Φ50mm. Calculate and determine the number of shrinking passes n and the shrinking coefficient mi of each pass and the shrinkage of each pass. Diameter di after 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 small. so choose m 平 = 0.945.

[0117] 3. Find the total number of shrinking 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. scientifically and 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 the advantages 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 [0002] The invention belongs to the field of mold manufacturing, and relates to the manufacture of molds for thin-walled cylindrical parts, in particular to a manufacturing method for shrinking dies for thin-walled cylindrical parts. Background technique [0003] Thin-walled cylindrical parts are made of aluminum, because of their light weight and relatively low strength. During multi-pass necking and pressure processing, if the mold is poorly prepared, it is very easy to cause instability and deformation of the workpiece, resulting in cracks at the bottom of the thin-walled cylindrical parts. Deformation, or even scrapping; and the height and dimensional consistency requirements of thin-walled special-shaped cylindrical parts are high, so mold design and manufacture are very important. [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. Th...

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Application Information

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IPC IPC(8): B21D37/20B21D41/04
Inventor 张孝云崔岩孙树勋
Owner THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME
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