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Double-acting type friction coefficient testing device and method

A friction coefficient and measuring device technology, applied in the field of material processing, can solve problems such as the inability to guarantee the accuracy of the friction coefficient

Active Publication Date: 2013-09-25
DALIAN JIAOTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this experimental device cannot accurately measure the flow stress of the deformed metal under specific conditions, and thus cannot guarantee the accuracy of the friction coefficient measurement

Method used

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  • Double-acting type friction coefficient testing device and method
  • Double-acting type friction coefficient testing device and method
  • Double-acting type friction coefficient testing device and method

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with accompanying drawing:

[0026] Figure 4 Shown: A double-action friction coefficient measuring device includes an upper power part, a lower power part, a working part and a supporting part. The upper power part includes a material performance tester 1, a hot gas baffle 2, an upper water cooling device 3 and a connecting screw 4; the lower power part includes a hydraulic cylinder 15, a pressure sensor 14 and a lower water cooling device 13; the working part is placed in a high-temperature heating furnace 22 , the working part includes upper pressing rod 5, upper retaining cylinder (6), upper retaining cylinder top cover 7, extrusion cylinder 8, extrusion rod 9, extrusion rod ejector rod 10, lower retaining cylinder (11), fixed pin 19. Blank 20, detachable column pin 21; the support part includes an upper support plate 12, a lower support plate 16, a support screw 17, and a fastening bolt 18; two s...

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Abstract

The invention discloses a double-acting type friction coefficient testing device and method, which belong to the technical field of material processing. The method comprises the following steps of: filling a blank in an extrusion cylinder during a test, introducing protective gas into a high-temperature heating furnace, and heating a working part to a preset temperature; implementing sinking strain of the blank through an extrusion rod so as to generate a certain pressure under the action of a lower power part; pushing down the extrusion cylinder through an upper pressing rod under the action of an upper power part, measuring a loading-process curve of the cylinder push process, and calculating the friction shear stress between the blank and the extrusion cylinder; directly contacting the upper pressing rod with an upper stopper top cover after the extrusion cylinder is completely separated from the blank, and compressing the blank by the upper power part, thus obtaining a stress-strain curve of the blank and flow stress sigma s under the deformation condition, and further obtaining the maximum shear stress value K of the material through the formula that K=0.577 sigma s; and calculating the friction coefficient m according to the constant-friction formula that tau=mK. The friction coefficient of compressional deformation can be tested at different temperatures and under different pressure conditions.

Description

technical field [0001] The invention relates to a double-action friction coefficient measuring device and a measuring method thereof, belonging to the technical field of material processing. Background technique [0002] In the process of metal plastic deformation, under the condition of using the same tool and mold, the deformation force mainly depends on the deformation resistance of the metal and the friction coefficient between the metal and the mold. Therefore, in the design and selection of forming equipment and the calculation of material forming process And the exact values ​​of these two parameters are especially needed in the finite element analysis of metal plastic forming. Among the current methods of measuring the friction coefficient, the ring upsetting method is the most commonly used. The premise of applying this method is to have an accurate line diagram. It will also affect the accuracy of the results, and the friction coefficient determined by this method...

Claims

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Application Information

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IPC IPC(8): G01N19/02
Inventor 运新兵刘雪晶裴久杨李冰高飞樊志新宋宝韫
Owner DALIAN JIAOTONG UNIVERSITY
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