摘要：机械制造业在整个国民经济中占有举足轻重的地位,金属切削作为机械制造的根本，在机械、电子、汽车、航空航天、船舶等现代产业部门中起着十分重要的作用。金属切削是用能够直接进行切削加工的刀具去切除工件表面材料,从加工条件来看，刀具在金属切削过程中至关重要。可以说切削加工技术的发展很大程度上源于刀具的发展。切断刀主要用于车削加工中工件的切断、切槽、切断面等工作,但一般切断刀在切削过程中都存在振颤现象，严重的将导致不能正常工作。经过多年的切削经验发现，改变刀具结构，实现自由切削，可以降低震颤,从而使切削顺畅。49010

    本文从切削机理和刀具结构两方面入手，以刀具寿命为目标，对切断刀进行几何参数优化。设计出一把在切削过程中，能够保持平稳、切线效率高、寿命长的切断刀。然后再对刀具进行AlTiN涂层，使其红硬性、耐磨性得到增强，切削性能更优，并且延长使用寿命。

毕业论文关键词：震颤；自由切削；结构优化；涂层

Design of coated tool for cutting and cutting grooves

Abstract：Machinery manufacturing industry occupies a very important position in the whole national economy, and the metal cutting process plays an important role in the modern industrial sector, such as machinery, electrical machinery, electronics, aerospace, shipbuilding and so on. Metal cutting is generally achieved through direct cutting tool, cutting tool in the process of metal cutting is very important. It can be said that the development of cutting technology, the history of innovation is the history of the development of the tool. And it is the most effective tool to improve the cutting efficiency. Cutting knife is mainly used for cutting, cutting, cutting, cutting and so on. In general, there is a serious vibration in the cutting process and can not work properly. The tremor can be reduced by free cutting, resulting in smooth cutting.

  In this paper, from two aspects of the cutting mechanism and chip removal, the cutting tool life is the goal, and the cutting tool geometry parameters are optimized. The cutting process is smooth, the cutter life is long, and the cutting efficiency is high. AlTiN coating on the tool to increase its red hardness, wear resistance, so that the cutting performance is better.

Key words: tremor; free cutting; structural optimization; coating 

目录

第一章 绪论 1

1.1 所选课题的背景 1

1.2 课题研究概况 1

1.2.1 刀具材料发展历史 1

1.2.2 自由切削理论 1

1.3 课题研究的目的与意义 3

1.4 课题来源和研究的主要内容 3

第二章 切削机理的研究 5

2.1 切屑形成机理 5

2.2 积屑瘤 5

2.3切削力 6

2.3.1 切削力分析 6

2.3.2 切削力计算 6

2.3.3 切削力的影响因素 7

2.4切削震颤 7

2.4.1 切削震颤现象及弊端 7

2.4.2 切削震颤的控制 7

第三章 双柱面切断刀机理研究与改进 9

3.1 双柱面刀切削机理及特点