基于球头铣削方式的淬硬钢最小切削厚度确定

发布时间：2018-10-23 12:23

【摘要】：汽车覆盖件模具精加工中,精加工余量较小,较小的精加工余量与刀具刃口钝圆半径处于相同数量级,为了实现汽车覆盖件模具的高品质加工,刀具刃口钝圆半径的影响应当引起重视。刀具刃口钝圆半径存在,使得塑性材料加工中存在最小切削厚度,当实际切削厚度小于模具材料最小切削厚度时,刀具与工件之间将出现滑擦,导致汽车覆盖件模具的加工精度和表面质量难以保证。提出一种确定最小切削厚度的新方法,该方法基于球头铣削方式,并验证所提出方法的有效性;以汽车覆盖件模具常用材料淬硬钢AISI D2为研究对象,采用所提出的最小切削厚度确定方法,确定不同硬度淬硬钢AISI D2材料的最小切削厚度值,研究速度效应对淬硬钢AISI D2材料最小切削厚度的影响规律,研究结果表明:在所选切削参数范围内,温度效应对淬硬钢AISI D2材料成屑的影响大于应变率效应的影响,此时随着切削速度的增加,最小切削厚度值增大。
[Abstract]:In the finishing machining of automobile panel die, the precision machining allowance is smaller, and the smaller precision machining allowance is the same order of magnitude as the blunt circle radius of the cutting edge of the cutting tool. In order to realize the high quality machining of the automobile panel die, The influence of blunt radius of cutting edge should be paid attention to. Due to the existence of the blunt radius of the cutting edge of the cutting tool, there is a minimum cutting thickness in the plastic material processing. When the actual cutting thickness is less than the minimum cutting thickness of the die material, there will be sliding friction between the tool and the workpiece. It is difficult to guarantee the machining accuracy and surface quality of automobile panel die. A new method to determine the minimum cutting thickness is proposed, which is based on the ball milling method and validates the effectiveness of the proposed method. The minimum cutting thickness of quenched steel AISI D2 with different hardness is determined by the method proposed in this paper. The effect of velocity effect on the minimum cutting thickness of hardened steel AISI D2 is studied. The results show that in the range of selected cutting parameters, the effect of temperature on chip formation of hardened steel AISI D2 is greater than that of strain rate, and the minimum cutting thickness increases with the increase of cutting speed.
【作者单位】：哈尔滨理工大学高效切削及刀具国家地方联合工程实验室;
【基金】：国家自然科学基金重点资助项目(51235003)
【分类号】：TG506

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