精品国产三级在线观看3_欧美日韩高清在线一区二区_日韩欧美国产黄片在线视频_国产在线观看天堂_欧洲日韩另类精品专区在线_亚洲精品偷拍区偷拍无码AV_最新高清中文字幕免费mv_放荡h粗大高潮女神视频_丰满的闺蜜2中文字幕_日韩久久无码看A

In fact, as early as the Qin and Han Dynasties gear appeared, was made of wood and metal. From its manufacturing materials, we can see that it is used to manufacture all kinds of mechanical products, one of the important parts. In the real life of our common gear types are: from the structural point of view, there are mainly bevel gears, cylindrical gears and non-circular gear, etc., from the tooth point of view, the main application of the most widely used involute gear and cycloidal gear Wait. Gear manufacturing is a specialized process, in order to mass and efficient production of gear, must be used with professional equipment and special tools.

Recently, the application of computers has been expanding and widely used and the continuous development of numerical control technology, along with the development of powder metallurgy products and processing technology, especially the processing of large gears is a leap of development, Out of a lot of new technology. Such as the new CNC milling machine, the new spiral bevel gear CNC machine tools, the use of new tool materials. Which can make large gears faster and more efficient; can be processed more types of gear, the scope of application is more extensive; processing efficiency and accuracy also improved, but also to a certain extent, to protect the environment; work efficiency has improved The In addition, with the development of powder metallurgy products, the application of oil bearing more and more widely.