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Friction factor measuring and calculating method during metal plastic forming

A technology of plastic forming and friction factor, which is applied to measuring devices, instruments, and mechanical devices, etc., can solve the problems that the influence of metal materials cannot be taken into account, the convenience and accuracy of measurement methods cannot meet the requirements at the same time, and avoid inconvenience. and the effect of bias

Inactive Publication Date: 2013-02-27
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

[0008] (1) Generally, the influence caused by different metal materials cannot be considered;
[0009] (2) The measurement method generally cannot meet the requirements in terms of convenience and accuracy

Method used

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  • Friction factor measuring and calculating method during metal plastic forming
  • Friction factor measuring and calculating method during metal plastic forming
  • Friction factor measuring and calculating method during metal plastic forming

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Embodiment Construction

[0036] The present invention is further illustrated by an example below.

[0037] Such as Figure 1 to Figure 5 As shown, a method for calculating friction factor in metal plastic forming according to the present invention, the method comprises the following steps:

[0038]1) Use the metal material to be tested (aluminum alloy 1100) to make a tensile test sample, and use the standard metal material tensile test method to measure the strain intensification coefficient of the metal material to be tested n =0.242;

[0039] 2) Use the mold material to be tested (steel H13) to make the upsetting forming mold, including the upsetting forming upper mold 2 and the upsetting forming lower mold 4, install the upsetting forming mold on the universal material testing machine, and set the upsetting forming mold on the upsetting forming mold. Apply the lubricant to be tested (graphite lubricant);

[0040] 3) Use the metal material to be tested (aluminum alloy 1100) to make a cylindrical ...

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Abstract

The invention discloses a friction factor measuring and calculating method during metal plastic forming. Firstly, a standard metal material tensile test is performed to obtain mechanical characteristic parameters of a metal material to be measured, a cylindrical workpiece is subjected to upsetting and compressive deformation, geometric data of the workpiece before and after deformation are obtained by measuring, and the mechanical parameters and the upsetting geometric data are combined to figure out the friction factor between an upsetting forming mold and an upsetting forming workpiece. The measuring and calculating method is convenient and accurate, material characteristics are considered, and inconveniences and deviation caused by curve correlation method and the like are avoided. The method is mainly specific to evaluation of friction and lubrication conditions during metal forming and has an important application value in the metal forming machining technology.

Description

technical field [0001] The invention relates to a friction factor measurement method, in particular to a friction factor measurement method in metal plastic forming. Background technique [0002] In the metal plastic forming process, the contact friction between the workpiece and the mold is ubiquitous. For example, in typical plastic forming processes such as metal upsetting, extrusion, embossing, and drawing, force consumption, deformation characteristics and rules, mold wear, formed product quality, and production efficiency are all closely related to contact friction conditions. and is significantly affected by it. Therefore, it is of great significance to study the friction problem in the metal plastic forming process. [0003] The nature of contact friction is extremely complex, and despite centuries of research, the mechanism of contact friction remains unclear. During the metal plastic forming process, the friction factor at different positions of the contact surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/02
Inventor 梅德庆姚喆赫沈辉陈子辰
Owner ZHEJIANG UNIV
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