Issue 58: Hengyu Guoqiang reducer - development and process
Time：2018-08-25 | Source：恒宇国强 | Browse：1035692
The development trend of general reducer is as follows:
① High level and high performance. Carburizing, quenching and gear grinding are widely used in cylindrical gears. The bearing capacity is increased by more than 4 times. The cylindrical gears are small in size, light in weight, low in noise, high in efficiency and high in reliability.
② Modular design. It is easy to expand and renovate the series, which is conducive to mass production and cost reduction.
③ Various types and variant designs. It gets rid of the traditional single base installation mode, and adds different types, such as hollow shaft suspension type, floating support base, integrated connection of motor and reducer, and multi-directional installation surface, so as to expand the scope of application.
The main factors to improve the reducer level are as follows:
① With the improvement of theoretical knowledge, it is closer to reality (such as gear strength calculation method, modification technology, deformation calculation, optimization design method, smooth transition of tooth root, new structure, etc.).
② The quality control level of materials and heat treatment is improved by using good materials and all kinds of high-quality alloy steel forgings.
③ The structure design is more reasonable.
④ The machining accuracy has been raised to ISO 5-6.
⑤ The bearing quality and service life are improved.
⑥ The quality of lubricating oil is improved.
Since the 1960s, China has formulated jb1130-70 "cylindrical gear reducer" and other standards for general purpose reducers. In addition to the self-made and matching use of the main engine factory, a number of professional reducer manufacturers have also formed. At present, there are hundreds of enterprises producing reducers in China, with an annual output of about 250000 universal reducers, which has contributed to the development of China's mechanical products.
Most of the reducers in the 1960s were manufactured with reference to the technology of the Soviet Union from the 1940s to the 1950s. Although they were developed later, they were limited to the design, technological level and equipment conditions at that time. There was a big gap between their overall level and the international level.
Since the reform and opening up, China has introduced a number of advanced processing equipment. Through the introduction, digestion and absorption of foreign advanced technology and scientific research, China has gradually mastered the design and manufacturing technology of various high-speed and low-speed heavy-duty gear units. The quality of material and heat treatment as well as the machining accuracy of gears have been greatly improved. The manufacturing accuracy of general cylindrical gears can be improved from grade 8-9 of jb179-60 to grade 6 of gb10095-88, and the manufacturing accuracy of high-speed gears can be stabilized at grade 4-5. After adopting hard tooth surface, the volume and mass of some reducers are obviously reduced, the bearing capacity, service life and transmission efficiency are greatly improved, which plays a great role in energy saving and improving the overall level of the main engine.
The power of the high-speed gear decelerator (speed increaser) designed and manufactured by our country has reached 42000kw, and the circumferential speed of the gear is more than 150m / s. However, the technical level of most of the reducers in our country is not high, the old products can not be replaced immediately, and the coexistence of new and old products will take a long time.
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