EXPERIMENTAL DETERMINATION OF THE DRAW BEAD COEFFICIENT OF FRICTION OF CuZn SHEETS IN SHEET METAL FORMING PROCESSES

IF 1.1 Q3 METALLURGY & METALLURGICAL ENGINEERING Acta Metallurgica Slovaca Pub Date : 2023-09-25 DOI:10.36547/ams.29.3.1780

Tomasz Trzepieciński, Valmir Dias Luiz, Marcin Szpunar

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Abstract

In sheet metal forming, draw beads are used to limit the flow of sheet metal in specific areas of the stamping die. The value of the coefficient of friction at the draw bead determines achievement of the desired resistance to sheet displacement. This article presents the results of experimental tests for determining the coefficient of friction on a draw bead using a specially developed tribotester. The test material consisted of CuZn37, CuZn30 and CuZn10 brass sheets in various states of hardening. Investigations were carried out with different roughness of the countersamples and sliding speeds. In addition, the tests were carried out under conditions of dry friction and lubrication of the sheet surface with LAN-46 machine oil. The relationships between the process parameters and the value of the coefficient of friction were analysed using the analysis of variance. It was found that the coefficient of friction decreases with increasing mean roughness of the countersamples. Lubrication reduced friction by about 6.2-29.8% depending on the grade of the tested sheet and the sliding speed.

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金属板成形过程中锌板拉延头摩擦系数的实验测定

在钣金成形中，拉伸珠用于限制冲压模具特定区域内钣金的流动。拉伸头处的摩擦系数决定了板料位移阻力的实现。本文介绍了用专门研制的摩擦试验机测定拉延头摩擦系数的试验结果。试验材料由不同硬化状态的CuZn37、CuZn30和CuZn10黄铜片组成。在不同的反样粗糙度和滑动速度下进行了研究。此外，还在干摩擦和用LAN-46机油润滑板料表面的条件下进行了试验。采用方差分析法分析了工艺参数与摩擦系数之间的关系。结果表明，摩擦系数随反样平均粗糙度的增大而减小。根据被测薄片的等级和滑动速度的不同，润滑减少了约6.2-29.8%的摩擦。

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