In the 1980s, the world gear technology developed greatly. The general trend of product development is miniaturization, high speed, low noise, high reliability. One of the most striking aspects of technology development is the technology of power branching and modular design of hard tooth surfaces.
In the 1980s, the technology of foreign hard tooth surface gear became more and more mature. Adopt high quality alloy steel forgings carburizing and quenching hard tooth surface gear grinding, precision is not lower than ISO1328-1975 level 6, the comprehensive carrying capacity of the hard tooth face and tempering gear 4 times, for 5 ~ 6 times of soft tooth surface gear. A medium-sized hard gear reducer weighs only about a third of the gear reducer. Power branch technology, which mainly refers to the power of the planet and the power of large power and multi-branch device, such as the central drive of the main reducer of cement mill, its core technology is reload.
Modular design technology, the universal and standard gear reducer to point to in the pursuit of high performance and diversification big coverage to meet user needs at the same time, minimize the blank parts specifications, in order to organize production, to form parts production batch, reduce costs, achieve economies of scale.
The application and maturation of these technologies make the performance ratio of gear products greatly improved, and the products are more and more perfect.
From the 1970s to the early 1990s, China's high-speed gear technology experienced three stages: mapping imitation, technology introduction (and technological breakthrough) to independent design and manufacturing. At present, our country's own design and manufacturing capacity can basically meet the domestic production needs, and the highest parameters designed and manufactured are: the maximum power of 44MW, the maximum linear speed of 168m/s, the maximum speed of 6700r/min.
China's low-speed heavy-duty tooth technology, especially the gear technology of hard tooth surface, has also experienced the stage of mapping and imitation, which has been gradually developed from scratch. In addition to understanding manufacturing technology, in the late 1980s and early 1990s, we also carried out a series of tasks such as "broken axis" and "selection". In the 1980s, it was considered that the cement grinding reducer and the rolling mechanical reducer, which were the two major problems in the domestic heavy duty gear, could be solved completely.
At the beginning of 80 s to the 90 s, successively formulated a batch of deceleration standard in our country, many of the goods according to the standard production of the main technical indicators are at or near the level of similar products, which are comparatively fully learned Germany FLENDER YNK reducer company characteristics of similar products, combined with national conditions to do a lot of improvement and innovation. The development of some products plays an active role in promoting the development of China's gear technology and promoting the development of national economy.
In the 1980 s, FLENDER etc. Only a few foreign companies entered the Chinese market, although they have the advantage in technology, but for the rapid development of China's industry of machine of decelerate of hard tooth flank, still structure is not too much of a threat. Since the mid-1990s, as the country has become more and more open, foreign companies have started to grab the Chinese market. In tianjin alone, there are many foreign companies, such as SEW, FLENDER and sumitong, etc. These companies are not only global, they are global manufacturing, they compete fiercely with domestic gear reducers with the advantage of equipment, technology, capital and production scale. They roll out the new update of hard tooth surface gear reducer, not only on the main technical indexes such as bearing capacity and improve, and in the aspect of modular design is a new effort. FLENDER, for example, updated its samples every two years from 1993 to 1999, with new enhancements each time. By contrast, many of China's gear factories now have more than a decade of constant production, are lagging behind, and have lost their price advantage. Say, begin from 1995, our country in the field of high-power gm's hard tooth surface gear reducer product we can not compete with foreign phase product series, led to our enterprise in competition with foreign companies often defeat, occupy market by foreign companies one by one; Many of China's general speed reducers are facing a serious market crisis. China's industrial general gear reducer products are facing the standard lag, the product innovation slow passive situation.