【正文】 ate system (2)Angles of cutter Establishment of plane coordinate system, cutter knife surface and each coordinate plane arose between angle, so that they can be used to express the degree of tilt of each knife, thereby changing the sharp edges of the cutter and the strength, design, grinding and measuring tool geometry, the cylindrical turning tool, knife surface are three main one, each blade according to the side two analysis requires two angles to determine the spatial position, therefore requires a total of six angles to determine the outer circle lathe tool geometry, the six angle is called the outer circle lathe tool independent point of view, as shown in figure 34: 大連交通大學 2020 屆本科畢業(yè)設計（論文）外文翻譯 Figure34The orthogonal plane of the reference coordinate system of cutting tool angle The angle of cutting tool manufacturing and grinding tool is needed, and the cutter design drawing shall be stated angle, outside round tool as an example, the angle is defined: ① anterior horn in the orthogonal plane measurement of the rake face and the angle between the front surface, angle of rake face inclined degree. Higher the rake angle cutter sharper rake face and the base surface, according to the relative positions of the different, respectively defined as positive rake angle, zero rake angle and side rake angle. ② the angle in the orthogonal plane measurement of the flank and the angle between the cutting plane. After the main main flank angle of tilt degree, generally positive. ③ side angle in the side cutting edges orthogonal plane measuring side flank face and the angle between the cutting plane. Back clearance angle said side flank inclination degree, generally positive. ④ the main angle in the inner base surface measurement of the main cutting edge on the base with the direction of feed angle projection. The main general positive angle. ⑤ on the surface side angle measurement in the secondary cutting edge on the surface projection and the feed motion in the opposite direction angle. General positive side angle. ⑥ in a cutting plane cutting edge inclination measurement in the main cutting edge and base of the angle between the. When the blade is positive, the strength 大連交通大學 2020 屆本科畢業(yè)設計（論文）外文翻譯 of the tool tip is low, iron filings to knife direction outflow, applicable to finish type cutter. Commonly used tool materials (1)Tool material should have the properties of In the process of metal cutting, cutting part of the tool at a high temperature under a lot of cutting force and cutting of intense friction, when working, also acpanied by shock and vibration caused by cutting, temperature fluctuations, therefore, cutting part of the tool materials should have good mechanical and physical and chemical properties, mainly: ① high hardness hardness must be higher than the material hardness, general cutting tool materials at room temperature shall be above 60HRC hardness. ② high wear resistance between the tool and the workpiece has a lot of relative motion velocity, friction, require high wear resistance material, generally the higher hardness wear resistance. ③ sufficient strength and toughness of cutting tool and workpiece to produce great cutting force, simultaneously also has the big impact force, the cutting tool material should have enough strength and toughness to ensure that the tool does not generate damage. ④ high heat resistance and high heat resistance is at a high temperature can still maintain the cutting performance of a character, usually with high temperature hardness values measured, can also be used while the tool is cutting allows the heat resisting temperature values measured. It is the important index of cutting tool material. Heat resistance and better material allows the cutting speed is higher. Tool material should also have better technological and economic. Tool steel should have good heat treatment, quenching deformation, hardening layer depth, decarburized layer shallow。 選擇刀具材料時，很難找到各方面的性能都是最佳的，因為材料性能之間有的是相互制約的，只能根據(jù)工藝需要保證主要需求的性能，如