Bearing ferrule grinding super processing new skills and development (1)

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Bearing ferrule grinding super processing new skills and development (1)

Source: Bearing network time: 2013-05-01
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1. The preface is a mechanical operation based on the entire industry; it is moving in the direction of high precision, high power, intelligence and flexibility. Grinding and superfinishing (referred to as “grinding”) are often the ultimate in mechanical products. Processing; its mechanical processing directly affects the quality and function of the product. As a bearing of the mechanical industry, the production of bearings; the grinding of the ferrule is the first step in the resolution of the ferrule parts and even the entire bearing accuracy; The super-processing of the tumbling appearance is the primary link affecting the bearing life and the vibration and noise reduction of the bearing. Therefore, the grinding and super-processing is the key skill and core skill in the bearing production skill field.
Foreign bearing industry; 60 era has formed a stable ferrule grinding super-processing process and fundamental approach; namely: double-face grinding centerless cylindrical grinding raceway cutting into centerless grinding raceway super-finishing processing. In addition to the special layout Bearings; demand is attached to a number of processes; many produced ferrules are processed according to this process. For decades, the process has not changed fundamentally; however, this does not mean that bearing production skills have not been carried out. Briefly In the 60th era, only the process of “double-end centerless circular cutting into the grinding and super-finishing” was established and carried out; and a series of cutting-in centerless grinding machines and super-finishing machines were born accordingly; the machining accuracy of parts reached 3~5um; Processing time 13 ~ 18s (small and medium scale). The 70th era is mainly based on the use of 60m / s high-speed grinding, control grinding skills and control grinding machine; the digital control skills of electronic control skills characterized by integrated circuits It has been selected a lot; then it has improved the stability of the grinding machine and the process; the machining accuracy of the parts reaches 1~3um; the processing time of parts is 10~12s.80 times; the process and equipment add Accuracy is not the problem; the primary direction is carried out under the premise of stable quality; seek higher power; adjustment more convenient and numerical control and automated production systems.
2. The grinding of the bearing ring is in the production of the bearing; the grinding labor accounts for about 60% of the total labor; the number of grinding machines used is also about 60% of the total metal cutting machine; the cost of grinding accounts for the entire bearing cost. More than 15%. About high-precision bearings; these parts of grinding processing are bigger. Others; grinding processing is the most messy in the whole processing process; it is still the most inexpensive one. It is still a messy table. Nowadays: the required functional indicators are more, the precision is higher, the processing and forming mechanism is more messy; there are many factors affecting the machining accuracy, and the processing parameters are difficult to be detected online. Therefore, the grinding process is one of the key processes in bearing production; how to choose New technology; new skills; complete the grinding process with high precision, high power and low cost; it is the primary task of grinding.
2.1 High-speed grinding skills High-speed grinding can complete the two principles of modern production skills to improve product quality and labor power. Practice has proved: if the grinding speed is improved from 35m / s to 50 ~ 60m / s; usually produced The power can be improved by 30% to 60%; the durability of the grinding wheel is improved by about 0.7 to 1 times; the roughness value of the workpiece surface is reduced by about 50%.
Generally, the grinding speed reaches 45m/s or more, which is called high-speed grinding. It is represented by ZYS 811 automatic bearing internal grinding machine developed by our company in the 80th era. It is the first to use high-speed grinding in the domestic bearing professional ring grinding process. Skills; successfully developed high-rigidity, high-speed, high-power electric spindle and high-speed grinding wheel. High-speed grinding at home and abroad has been widely used; and it is widely used with high grinding ratio, high durability super hard abrasive such as CBN; Grinding speed has reached 80 ~ 120m / s; even higher. Such as: Germany Mikrosa, Japan KOYO company's centerless grinding machine; Japan TOYO company's bearing internal grinding machine; external and external grinding wheel speed of 120m / s; inside and outside Table grinding line speed of 60m / s ~ 80m / s.
Increasing the power of the grinding wheel drive (transmission) system and improving the rigidity of the machine tool; it is an important measure to complete high-speed grinding; while the high-speed spindle unit is the most important part of the high-speed grinding machine. In high-speed grinding, the grinding wheel should be satisfied. In addition to strength; also need to ensure outstanding grinding function; to achieve high grinding effect. Others; cooling equipment is also one of the equipment to complete high-speed grinding is not short.
2. 2CBN grinding wheel grinding technology Cubic boron nitride abrasive is referred to as CBN abrasive; the grinding wheel made by it is called CBN grinding wheel; it has the following characteristics: (1) high hardness; high thermal conductivity; good thermal stability; acceptable 1300-1500 °C high temperature. (2) High durability; wear. ハ鞅瓤 4,000 ~ 10000 (grinding ratio refers to the ratio of the amount of workpiece material to the wear of the grinding wheel during the grinding process) and the general corundum grinding wheel is only 50 ~ 80. (3) grinding Force. ハ 刃 .. すぜ すぜ απ. 聿阌 α Ρ 蛎 . .. (4) assisted moments (dressing wheel, replacement grinding wheel) greatly reduced.
For China's bearing profession; the use of CBN for ferrule grinding is a new processing skill; the use of vision is very broad; but the need to discuss the following skills: CBN grinding wheel production skills, finishing skills, special bearing grinding machine and grinding cooling Liquid, etc.
Because CBN grinding wheel has outstanding processing characteristics; the use of CBN grinding wheel for bearing ring grinding has been developed and used in production abroad; and it is called "a revolution in production and processing skills". Since 1982; CBN grinding wheel It has been used in large numbers in Japan; and it has increased at a high speed.
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