【作者】 刘石头；

【导师】 陈永洁；

【作者基本信息】 华中科技大学 ， 机械电子工程， 2006， 硕士

【摘要】 随着现代制造业的发展,对金属切削加工的要求也变的越来越高。刀具是切削加工中的一个关键环节,它直接关系到切削性能的好坏。本文在大量实验的基础上,主要对当前的刀具在设计制造中遇到的一些问题进行了研究。本文的内容分成两个方面,一个是刀具设计中的问题,主要针对断屑槽的设计问题与刀具使用中出现的问题进行研究,总结刀具设计中一些特点,对以后的刀片设计给予指导;另一个是刀具制造工艺中的问题,以对麻花钻的刃磨为例对空间直纹面的加工问题进行了研究。论文阐述了断屑槽研究的意义,对国内外切屑控制和断屑槽的研究概况进行了总结。论文提出了切削过程中经常遇到的飞溅问题,从原理上对飞溅产生的原因进行了分析,并进行了实验研究,对比了不飞溅刀具与飞溅刀具设计上的异同,论证了飞溅与三维断屑槽几何特征之间的关系。论文还论述了刀具几何特征及被加工材料与切削力之间的关系,对刀具的断屑范围、切削力、刀具耐用度与断屑槽设计之间的联系进行了深入的分析。从理论上分析了减摩槽作用的机理,并使用实验的方法,指出了减摩槽应用于三维断屑槽时对于切屑形态的影响,进一步确定了对切削力的影响,并论证了减摩槽对于刀具耐用度的影响。介绍了对国外刀片的切削实验研究,提出了实验中切削速度与工件直径对于切削的影响;在大量试验的基础上,重点分析了工件材料、刀片的结构与几何特征在切削时的不同影响,指出了现今不锈钢用切削刀片的设计特点。以刃磨麻花钻后刀面为例研究了切削刀具加工中的直纹面加工问题,并将这种方法应用到实际的数控磨床改造中,收到了良好的效果。更多还原

【Abstract】 With the rapid development of the modern manufacture, modern cutting technology is demanded higher increasingly. Tools play an important role in the cutting manufacture because of their great effect on the performance of cutting. The paper studies some problems in the cutting tools design and manufacture experimentally. There are two parts in the paper. One studies the chip-breaking groove design, which is an important part of the turning tools design, and some problems in the using of the cutting tools. The other studies grinding ruled surface, which is an important part of grinding the twist drill, and the method can be applied into grinding the ruled surface of another cutting tool.The paper presents the significance of chip-breaking groove studies, and summarizes the background of chip control and chip-breaking groove at home and abroad.The analytical and experimental research presented here deals with the chip flying. The relationship between the chip flying and the geometrical feature of the groove is studied. The relationship of the geometrical feature of the groove, the material, and the cutting force is studied, and the relationship of the chip-breakability, the cutting force and the tool life is studied, too.The theory of the friction-reducing groove is presented here, and its effect on the chip form, the cutting force and the tool life are studied analytically and experimentally. The paper, based on the experiments, points two problems in the cutting test, which are the effects of the cutting speed and the radii of the workpiece in the cutting process. The paper analyzes the materials and the geometrical feature of the insert, and summarizes the characteristics of the chip-breaking groove for the stainless steel. The paper studies the method of grinding the ruled surface of the twist drill in the 6-axis CNC grinding machine with the conical grinding method, and the method is applied in the manufacture.更多还原