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Grinding and high-speed grinding skills for bearing rings
Source: Bearing network time: 2017-12-30
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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 the production power can be improved 30%～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 above 45m/s, which is called high-speed grinding. It is represented by ZYS 811 automatic bearing internal grinding machine developed by our company in the 1980s. 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 for the completion of high-speed grinding; and 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 finish high-speed grinding is not short.
CBN 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; can accept high temperature of 1300 ~ 1500 °C (2) High durability; wear. ãƒéž…瓤 4000 4000～10000 (grinding ratio refers to the ratio of the amount of workpiece material to the wear amount of the grinding wheel during the grinding process) and the general corundum grinding wheel is only 50-80. (3) Grinding force.ム刃 . . . . . . . . . . . . . . . . . . . ( ( ( ( ( ( ( ( ( ( ( ( ( (.
For China's bearing profession; the use of CBN for ferrule grinding is a new processing skill; the application of the 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 researched and developed abroad and used in production; 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.
External and external grinding wheel automatic balancing skills for external and external surface grinding; due to the large grinding wheel and non-homogeneous structure; the center of gravity of the grinding wheel system always violates the middle of the spindle; high-speed rotation must incur the oscillation of the grinding wheel system and its entire machine tool; Directly affect the service life of the machine tool. Under this circumstance; the grinding process will be difficult to reach high precision; it is easy to cause the grinding surface of the workpiece to occur; the waviness is increased.
Automatic balancing equipment for mechanical or other methods on the machine grinding wheel; the speed is directly forced to the most balanced position after starting up; the automatic balance is perfect and the static balance of the grinding wheel can be saved. The breaking of this skill promotes grinding The development of skills; together can greatly extend the grinding wheel, trim diamond and spindle bearing life; reduce machine oscillation; long-term adherence to the original accuracy of the machine.
The ability to quickly eliminate internal and external surface grinding in all bearing grinding equipment; the level of the internal and external surface grinding machine has the meaning of the mark. This is mainly because the grinding aperture constrains the grinding wheel scale and the corresponding system organization mobilization parameters; fundamentally Constraining the rigidity of the process system; together with the high processing precision requirements, it is necessary for us to deepen the process of the internal and external surface grinding process; in addition to the maximum constraint to carry out the cutting of the machine tool and the grinding wheel; The grinding moment is the key to improving the grinding power; since the grinding idle time accounts for about 10% of the entire grinding moment.
At present, the skills of using a wide range of speeds to eliminate grinding and air-moving at home and abroad include the following: control grinding skills; constant power grinding skills; using automatic measuring instrument skills and measuring electric spindle current skills.
CNC numerical control skills and communication servo skills communication servo motor and PLC programmable controller positioning module; servo amplifier connected to form a servo system; servo motor itself with optical rotary encoder; its output signal is reflected to the servo amplifier It can form a semi-closed loop control system. It can ensure the positioning accuracy at high speed (3000rpm) and low speed operation. The servo system can complete the fast jump, fast trend, trimming compensation and rough grinding; the machine feed organization is greatly simplified; Reliability has greatly improved.
Communication frequency control technology in the grinding process, the line speed of the grinding wheel gradually decreases with the cost of the grinding wheel; the ratio of the starting end to the end line speed is about 3:2. Currently; high line speed grinding has been used in the grinding wheel grinding category. In order to improve the grinding power and ensure the consistency of the grinding quality; use the programmable controller accounting function to calculate the grinding wheel radius after each dressing wheel; and then calculate the input frequency of the inverter that adheres to the constant line speed of the grinding wheel; Inverter; then ensure that the wheel speed is constant.
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