What materials are used for gears?

The common steels used in the manufacture of gears are tempered steel, quenched steel, carburized quenched steel and nitrided steel. The strength of cast steel is slightly lower than forged steel, commonly used in gears of larger sizes; gray cast iron mechanical properties are poor, can be used for light load open gear transmission; ductile iron can partially replace the steel manufacturing gears; plastic gears are used for light loads and low noise requirements, and its paired gears are generally used with good thermal conductivity of steel gears.

Future gears are heavy-duty, high-speed, high-precision and high-efficiency direction, and strive for small size, light weight, long life and economic reliability.

Introduction of gears

Gear is a rim with teeth can be continuous meshing transfer of movement and power of the mechanical elements, is able to mesh with each other with the teeth of the mechanical parts, the diameter of the large gears is the diameter of the pinion double. Gears in the transmission of the application appeared very early, more than 300 years BC, the ancient Greek philosopher Aristotle in the "mechanical problems", on the issue of bronze or cast iron gears to transmit rotary motion. the end of the 19th century, the principle of spreading into the tooth cutting method and the use of the principle of cutting teeth of the special machine tools and cutting tools appeared one after another, so that the gear processing with a more complete means, and with the development of the production of gears and gears, the smoothness of operation has been attached importance to. The smoothness of the gear operation has been attached importance.

Gear processing

Involute gear processing methods have two categories, one is the imitation method, milling the gear groove with molding milling cutter, is "imitation shape". The other is the Fan Cheng method (Spreading method).

(1) Hobbing machine hobbing: it can process helical gears up to 8 modules

(2) Milling machine milling: it can process straight racks

(3) Inserting machine inserting: it can process internal gears

(4) Cold punching machine punching: it can be processed without any chips

(5) Planer planer planing: it can process large gears with 16 modules

(6) Precision casting: it can process large quantities of gears

(7) Precision casting: it can process large amounts of gears with 16 modes. Precision gear casting: can be processed in large quantities of cheap small gears

(7)Gear grinding machine grinding: can be processed on the precision master gears

(8)Die-casting machine casting: most of the processing of non-ferrous gears

(9)Shaving machine: a gear finishing metal cutting machine tools

Chinese market development

China's gear industry in the "Tenth Five-Year" period. "Tenth Five-Year" period has been rapid development: in 2005, the annual output value of the gear industry increased from 24 billion yuan in 2000 to 68.3 billion yuan, with a compound annual growth rate of 23.27%, has become China's largest industry in the basic parts of machinery. In terms of market demand and production scale, China's gear industry in the global ranking has exceeded Italy, ranking fourth in the world.

China's gear manufacturing industry, compared with developed countries, there is still a lack of independent innovation, new product development, slow, disorderly market competition, weak corporate management, low degree of information technology, the comprehensive quality of practitioners need to be improved, etc. In 2012, the development of the gear industry may be presented, "before the low after the high, medium-speed growth," the situation. Last year, the fourth quarter of the industry growth slowdown trend will continue into the first half of this year. In the second half of the year, with the national policy of expanding domestic demand gradually in place, the development of strategic emerging industries and the country's "three-based planning" began to be implemented, will certainly enhance the modern equipment manufacturing industry, thereby driving the gear industry as a whole a new round of rise.

With the gear industry competition continues to intensify, large gear enterprises between mergers and acquisitions and capital operations are increasingly frequent, the domestic outstanding gear production enterprises pay more and more attention to the study of the industry market will be conducive to the construction of a new world of gear modernization, to promote China's economy, technology to a new height.