<1> Metal cutting tools must possess a variety of different properties in order to cut the different metal under varying conditions of severity. To meet these demands, tool has been produced from a variety of materials.www.mapeng.net 马棚网机械资讯

Properties of Cutting Toolswww.mapeng.net 马棚网机械资讯

<2> The most important properties of cutting tools are hardness at high temperature, wear resistance ,and impact strength.www.mapeng.net 马棚网机械资讯

<3> As a tool cuts, high heat is developed as a result of compression and friction at the cutting edge of the tool. All metal cutting tools begin to lose hardness when heated to sufficiently high temperature .As the tool softens due to heat, it wears and breaks down at the cutting edge or face. Various cutting tool materials begin to lose their hardness at different temperatures. Hence, the hardness of the tool and the degree to which it remains its hardness at high temperature are important in the selection of a cutting-tool material.www.mapeng.net 马棚网机械资讯

<4> A cutting tool is wear-resistant if it resists abrasion at the cutting edge and along the tool face. Wear resistance improves as cutting tool hardness increase.www.mapeng.net 马棚网机械资讯

<5> Cutting tools must also have strength in order to be vibration and impact-resistant. Strength in cutting-tool material is not always proportional to hardness. Some of the hardest tool materials lack strength because they are too brittle.www.mapeng.net 马棚网机械资讯

Materials Used in Cutting Toolswww.mapeng.net 马棚网机械资讯

<6> The various materials from which most metal cutting tools are made can be classified under the following principal headings: www.mapeng.net 马棚网机械资讯

1. Carbon tool steel www.mapeng.net 马棚网机械资讯

2. High-speed steelwww.mapeng.net 马棚网机械资讯

3. Cast alloyswww.mapeng.net 马棚网机械资讯

4. Cemented carbideswww.mapeng.net 马棚网机械资讯

5. Ceramicwww.mapeng.net 马棚网机械资讯

6. Diamondswww.mapeng.net 马棚网机械资讯

Tool lifewww.mapeng.net 马棚网机械资讯

<7> Tool life, or the number of parts produced by a cutting-tool edge before regrinding is required, is a very important cost factor in manufacturing a part or product. Cutting tools must be reground at the first sign of dullness. If a tool is beyond this point, it will break down rapidly.www.mapeng.net 马棚网机械资讯

<8> In order to detect the time when a cutting tool should be changed, most modern machines are equipped with indicators that show the horsepower used during the machining operation. When a tool becomes dull, more horsepower is required for the operation, which will show on the indicator. When this occurs, the tool should be reconditioned immediately.www.mapeng.net 马棚网机械资讯