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过去,人们认为机械加工产生的毛刺是不可避免的,往往需要在后道机械加工中加以消除。随着加工技术的发展和不断的生产实践,人们逐渐认识到通过改进机械零件外形设计,合理的选择刀具及切削规范,可对机械加工中毛刺进行一定程度的控制,做到加工件上不出毛刺、出小毛刺或使毛刺产生在无影响的部位,从而提高加工表面质量,降低加工成本。机械加工中产生毛刺的因素很多,但其中主要原因之一是刀具问题。由于切削刀具刃口不可能刃磨得绝对锋利,即使使用很精细的刃磨方法,最终仍在切削刃上留有不少于10～20μm的圆角。加之切削过程中刀具磨损钝化和刀瘤的影响,常使刀具处于负前角条件下工作,造成切削条件恶化、切削阻力增加,切削热增高。此时,靠近刀具刃部的金属材料不是处于被
In the past, burrs produced by machining were thought to be unavoidable and often needed to be eliminated later in machining. With the development of processing technology and continuous production practice, people have come to realize that by improving the mechanical parts shape design, a reasonable choice of tools and cutting specifications, burrs can be machined to a certain degree of control, so that the workpiece can not Burr, a small burr or burr generated in the no-impact site, thereby improving the quality of the processing surface and reduce processing costs. There are many factors that cause burrs in machining, but one of the major causes is the tooling problem. Due to the fact that it is impossible to sharpen the sharpening edge of the cutting tool to be absolutely sharp, a fillet of not less than 10 to 20 μm is finally left on the cutting edge even with a very fine sharpening method. Coupled with the cutting tool passivation and tool wear passivation, often in the negative angle tool conditions, resulting in deterioration of cutting conditions, cutting resistance increases, cutting heat increased. At this time, the metal material near the blade edge is not in the trapped state