Self-adaptive control method of spherical numerical-control precision grinding process

Abstract

The invention relates to a self-adaptive control method of spherical numerical-control precision grinding process in the technical field of automatic control, comprising the steps of: collecting a current value of a driving motor in the grinding process and setting the current value as a processing current threshold; detecting a current value of a grinding wheel driving motor by taking once circulatory feeding of a grinding wheel frame as a detection period during the processing; and solving the average value of the currents according to continuous 5-minute current values of the grinding wheel driving motor and carrying out optimization judgment. In the invention, through detecting the current of the grinding wheel driving motor and controlling the grinding feeding depth (feeding amount)in the rotary spherical grinding process of a high-hardness material, the current of the grinding wheel driving motor is kept at a proper value all the time, namely, the feeding depth (feeding amount) of the grinding wheel frame is basically consistent with the removal rate of the workpiece material during the grinding of the grinding wheel, thereby achieving efficient and stable grinding effect.

Description

technical field [0001] The invention relates to a method in the technical field of automatic control, in particular to an adaptive control method for a high-hardness material rotary spherical surface numerical control precision grinding process. Background technique [0002] High-hardness and high-precision rotary ball is a key component in high temperature resistant, high pressure resistant and wear resistant ball valves. This type of ball valve is subjected to very harsh working conditions. In order to improve its high temperature resistance and wear resistance, the surface of the ball valve is usually sprayed with high hardness materials such as WC and Ni60 with high wear resistance. On the other hand, since this kind of ball valve generally works in a high temperature and high pressure environment, the sealing requirements are also quite high. In this case, a hard sealing method is often used. In this sealing method, the shape accuracy (sphericity) of the ball And surfa...

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Problems solved by technology

However, the detection device of this kind of special CNC spherical grinding machine only detects the size of the workpiece to be ground, but does not realize the control of the grinding process.

[0004] A further search found that Chinese Patent Document No. CN101172330A, published on May 7, 2008, records a high-hardness rotary spherical CNC precision grinding equipment. This technology mainly introduces the mechanical structure of high-hardness rotary spherical CNC precision grinding equipment. Also does not involve the patent content of the adaptive control of the grinding process

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