香蕉视频在线免费看91香蕉视频APP黄香蕉视频黄色网站91香蕉在线观看视频 国产精品揄拍100色网视频,日韩三级久久,国产一级无码Av片在线观看,亚洲色图专区

[I] metallurgical machinery gears up to be hard
    In order to obtain a higher metallurgical machinery parts gear hardness during use, good wear resistance and fatigue resistance, heat treatment process is often used to increase the performance of metallurgical machinery gears, which require heat treatment gear drive axle cars differential gears, transmission gears, engines and other gear.
    First, we use to be normalizing, also known as normalizing, the workpiece is heated to Ac3 (Ac refers heating free ferrite transformed to austenite finish temperature, typically from 727 ℃ to 912 ℃ of inter) or Acm (Acm is the actual heating hypereutectoid fully austenitic steel critical temperature line) more than 30 ~ 50 ℃, holding time, remove from the oven in the air or water, or hair spray cooling metal heat treatment process. Secondly longer be quenched, that is, quenching and tempering (500 ° -650 °) complex heat treatment process of steel or steel. Used for quenching said steel quenched and tempered steel. It generally refers to the carbon-carbon structural steel and alloy steel. The final step is to be carried out after carburizing, carburizing to be fully beneficial effects carburizing. Carburizing purpose is to obtain a high surface hardness, high wear resistance and fatigue strength, and maintain core part have low carbon steel toughness after quenching, the workpiece can withstand the impact load, in order to extend the life of the part.
    To sum up using the above approach can effectively make several metallurgical machinery gears improve the hardness to give a qualitative sublimation, thereby increasing life expectancy. This article comes from Jiangsu New Silver Leaf Transmission Ltd provided.

Links:
Belt conveyor gear http://nsk-zg.com/products-detail.asp?cpid=453
Universal gear gear http://nsk-zg.com/products-detail.asp?cpid=442