挤压切削加工工艺参数的多目标优化

高速重载制动盘表面需要具有高抗疲劳性能和接触强度,且摩擦接触时提供较大的摩擦力。为实现以上性能,提出采用挤压切削工艺对制动盘表面进行加工的方法,以获得高质量的接触表面。基于挤压切削原理,建立挤压切削力学模型。以制动盘常用材料Q345B作为试验材料,考虑切削速度、切削深度、刀具前角、刀具后角、刃口圆弧半径5个因素,以表面粗糙度、残余应力、显微硬度为评价指标进行正交试验。采用信噪比法和灰色关联度法进行多目标参数优化,获得了制动性能好、使用寿命长的制动盘表面。

Multi objective Optimization of Extrusion Cutting Process Parameters

The surface of high speed and heavy duty brake disc needs to have high fatigue resistance and contact strength, and provides large frictional force during frictional contact. In order to achieve the above performance, a method of processing the surface of the brake disc by using an extrusion cutting process was proposed to obtain high quality contact surface. Based on the principle of extrusion cutting, a mechanical model of extrusion cutting was established. The common material Q345B of brake disc was used as test material, five factors including cutting speed, depth of cut, rake angle, clearance angle and edge arc radius were taken into account, the orthogonal test was carried out with surface roughness, residual stress and micro hardness as evaluation indexes. The signal-to-noise ratio (SNR) method and grey correlation method were used to optimize the multi objective parameters, and the brake disc surface with good braking performance and long service life was obtained.