Bearing ring outer circle centerless grinding technology

1, high speed grinding technology can improve the production efficiency 30% 60% of the durability of the grinding wheel increased about 0. 71 times, high speed grinding to achieve two goals of modern manufacturing technology to improve product quality and labor efficiency. The practice proved: if the grinding speed by 35 m / 5060 m /. Workpiece surface roughness parameter value reduced by about 50%. To realize high speed grinding, an important measures to increase grinding wheel drive ( Transmission) Power system and improving the rigidity of machine tool. And one of the high-speed spindle unit is the most key components of the high-speed grinding machine. High speed grinding, grinding wheel in addition to should have sufficient strength, also need to make sure that it has good grinding performance, the ability to get high grinding effect. 2, CBN grinding wheel grinding technology made by the grinding wheel is called the CBN grinding wheel, CBN abrasive CBN abrasive for short. The main has the following characteristics: ( 1) High hardness, high thermal conductivity, good thermal stability, affordable - 1300 1500 ° C high temperature. ( 2) High durability, small abrasion, grinding ratio can reach 4000:10000. Grinding ratio refers to the amount of grinding process to remove the workpiece material and the ratio of the grinding wheel wear. While the common corundum grinding wheel is only 50 - 80 ° C, using CBN ferrule grinding is a kind of new processing technology, for China's bearing industry. Application prospect is very broad, but need to study to solve the following technologies: CBN grinding wheel manufacturing technology, finishing technology, special bearing grinder, grinding coolant and so on. Use of CBN grinding wheel bearing ring grinding, abroad has already been developed and used in the production, due to the CBN grinding wheel has a good processing characteristics. As 'production and processing technology of a revolution' since 1982, CBN grinding wheel in Japan has a large number of applications, and high-speed growth. 3, the surface grinding wheel automatic dynamic balancing technology because of its high grinding wheel and body for heterogeneous groups, for surface grinding. Center of gravity is always deviated from the spindle center wheel system, high speed rotates must cause the vibration of grinding wheel system and the whole machine, directly affects the service life of machine tool. After startup fast approaching the equilibrium position directly, machine tool grinding wheel. Installed directly on mechanical or other means of automatic dynamic balancing device. This technology breakthrough to promote the development of grinding technology, at the same time can greatly limit extend the service life of diamond grinding wheel, trimmed with and spindle bearings, reducing machine tool vibration, temporary adhere to the original precision machine tools. 4, quickly remove empty inside surface grinding process technology levels of surface grinding machine in symbolic significance. Mainly grinding aperture limit the size of grinding wheel and the corresponding institutions set parameters, all bearing grinding equipment. Fundamentally limits the process system of rigid, at the same time, the machining accuracy is higher. These require I have internal surface grinding process into the in-depth research, in addition to play to the greatest limit machine tools and grinding wheel cutting ability, reduce the auxiliary time is the key to improve the efficiency of grinding, grinding for grinding idle accounts for about 10% of the grinding time. 5, CNC numerical control technology and servo amplifier is connected to ac servo technology can constitute a servo system, ac servo motor with positioning module of PLC programmable controller. Servo motor itself with optical rotary encoder, the output signal feedback to the servo amplifier can constitute a half closed loop control system. High speed ( 3000 RPM can ensure positioning accuracy, and a low speed servo system can complete jump, fast, trim cover, crude fine grinding, make the machine tool feed mechanism is greatly simplified, greatly improve the performance reliability. 6, ac variable frequency speed regulation technology the start and the terminal velocity ratio of about 3:2, the consumption of the linear velocity of grinding wheel in grinding with grinding wheel to reduce gradually. Grinding wheel grinding field contour grinding speed, has been adopted in order to improve the grinding efficiency, ensure the quality of grinding consistency, function is obtained by using the programmable controller is calculated after each dressing grinding wheel grinding wheel radius, and then calculate the maintain constant linear velocity of grinding wheel input frequency converter, and transfer to ac frequency converter, thus ensuring grinding wheel linear velocity is constant.