三角形摩擦块粉末压制工艺模拟分析

Simulation Analysis of Powder Compaction Processes of Triangle Friction Blocks

三角形摩擦块在压制过程中出现裂纹、掉角等缺陷,严重影响压坯的使用性能。采用MSC.Marc软件对三角形铜基粉末冶金摩擦块的压制过程进行有限元模拟分析,研究压制方式、摩擦因数、保压时间等参数对摩擦块的应力及相对密度分布的影响。结果表明:与单向压制方式相比,双向压制制备的粉末压坯相对密度较大,密度均匀性好;摩擦因数对摩擦块相对密度和等效应力分布的影响较大,摩擦因数越小,摩擦块密度均匀性越好,等效应力越小且分布越均匀,而保压时间对摩擦块相对密度和等效应力分布的影响较小。对原压制工艺进行改进,提出较为经济实用的压制工艺方案。

Some defects easily occur in triangular brake pad during compacting, such as cracks and crush,which impacts on the properties of the green compact.Compacting process of triangular brake pad composed of copper-based powder metallurgy material was simulated by MSC. Mare software, and the influence of different friction conditions, dwell time and other process conditions on stress distribution and relative density of brake pad was researched.The results show that the relative density of brake pads prepared by the bidirectional pressing is higher and well-distributed.The influences of friction coefficient on the relative density and the distribution of equivalent stress of the brake pad are larger, with smaller friction coefficient in the pressing process, the prepared triangular brake pad has more uniform density, smaller equivalent stress and more uniform equivalent stress distribution.While the holding time has small influence on the relative density and the distribution of equivalent stress of the brake pad.The original press process of the triangular brake pad is improved, a more economical and practical pressing process was put forward.