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Stepping motor of bearing grinding machine and its control system
Source: China Bearing Network Time: 2018-06-07
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Followed by a large number of stepper motor control bearing grinding machine facing the city. Pouring low morning 刂 奈 奈 奈 庖 庖 庖 丛 丛 丛 éŠå¦« éŠå¦« éŠå¦« éŠå¦« éŠå¦« éŠå¦« éŠå¦« éŠå¦« éŠå¦« éŠå¦« éŠå¦« éŠå¦« ç¼ ç¼ ç¼ ç¼ ç¼ ç¼ ç¼ ç¼ ç¼ ç¼ ç¼åµ‹é™¨ 牟 牟 ç¼ ç¼ ç—ª ç—ª ç—ª ç—ª ç—ª ç—ª ç—ª ç—ª ç—ª ç—ª å·¢ å·¢ å·¢ å·¢ å·¢ å·¢ å·¢ å·¢ å·¢ å·¢ å·¢ å·¢ å·¢ å·¢
The stepping motor system presents many problems. We have done research on the inner ring groove grinder of the ball bearing; we have tried several stepping motors of several brands in China; we found that the different steps of the two systems are very serious. Not the same. Step error test starts from PLC, position control module, stepper motor driver and stepper motor.
The lead screw lead is 4 mm; the harmonic reducer has a reduction ratio of 1:80; the step angle is 0.99; the pulse equivalent is 0. 125 μm.
The repetitive positioning error of the stepping motor has now exceeded the machine accuracy specification by 3 times. According to the pulse equivalent of 0. 125 μm, the cumulative repeat positioning error of the workbench has reached 0 in 20 times. The data in Table 1 clarifies not only Only the error of the stepper motor; the error of the mechanical system is more and more significant.
We analyzed the feed organization and compensation organization of this machine tool; it was found that the mechanical problem was also severe.
The top of the list; the nominal diameter of the ball screw is biased. é20); the accuracy level is lower than the level 3; and the appearance of the hand is more severe.
Second; the feed fast-jumping cylinder and the ball screw depict the positioning; the mounting orientation error cannot be eliminated,
Third; the harmonic reducer and the ball screw have no key connection or pin connection as long as the screw is locked.
Fourth; no ball screw bearings are used.
Then we analyzed the electrical system of the machine tool; found that the inverter, transformer and stepper motor controller are placed close to each other; the data cable from the PLC output is not shielded; the combination of strong and weak power cables with the disk These problems are all factors that affect the instability of the stepper motor system.
Because the anti-interference of China's stepper motor system can be poor; the irrationality of these electrical drawing plans will directly lead to accidental feed system and compensation system errors; plus the systematic errors of the mechanical system; the machine tool will be in unstable operation. situation.
It is not to say; as long as the hydraulic feed compensation system of the machine tool is changed into the stepping motor feed compensation system; the whole induction function of the machine tool will definitely advance significantly. The stepping motor replaces the original messy hydraulic feed compensation system; The error of the hydraulic shake and mechanical parts processing drive chain is eliminated; and the stepping motor can divide the feed process into several periods; each period can use different pulse frequency to control the feed speed; the number of pulses can be used to control the machine The workbench is fine-grained; this is indeed a big step forward than the bearing grinders of the original hydraulic system. However, it is followed by the other associations of the machine tool, which are also updated with the description; the satisfaction of the grinding machine skills needs of the machine. The depiction of the mechanical layout is still the depiction of the electrical system. It should not ignore the anti-jamming characteristics of the stepper motor system. It is assumed that the solution to the above problems is not properly solved; it is assumed that all the components of the machine are especially critical. The components are still the specifications of the original mechanical hydraulic system machine tools; the bearing grinding machine controlled by the stepper motor system Will not be improved in essence.
Of course; the most complete method is to select the world's most advanced servo motor control system. Select the bearing grinding machine of the servo motor control system; remove the fast jump cylinder and the harmonic reducer; use the ball screw and the servo motor to directly connect the layout; Mechanical system errors are minimal. Although China's choice of servo motor control system bearing grinding machine is still mostly pulse control; but the induction motor drive induction; anti-interference ability and repeat positioning accuracy; compared to stepper motor bearing grinding machine has made a big move Step. Because of the characteristics of the stepper motor system and many bugs; it only mechanical hydraulic control to advance to a transition product of the servo system control center; foreign countries now rarely see the fine grinding machine controlled by the stepper motor system; The most advanced country in the use of stepper motor system on CNC machine tools. Following the acceleration of China's bearing professional technical reform speed; followed by the development of more and more high-quality bearing companies; the end of the bearing grinding machine controlled by the stepper motor will be servo motor Replacement.
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