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Stepping motor and its control system for bearing grinding machines in China
Source: Bearing network time: 2017-11-01
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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.
Ball screw lead 4mm; harmonic reducer reduction ratio is 1:80; step angle is 0. 9°
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; found that the mechanical problem is also more 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, the second; Feeding fast-jumping cylinder and ball screw depicting positioning; installation orientation error can not be eliminated, third; harmonic reducer and ball screw as long as the screw is locked without key connection or pin connection, fourth; no ball screw bearing is selected and many more.
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. The pulse equivalent is 0. 125 μm.
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 original hydraulic shake and mechanical parts processing drive chain is eliminated; and the stepping motor can divide the feed process into several periods; The same pulse frequency controls the feed rate; the number of pulses can be used to control the precision of the machine table; this is indeed a big step forward compared to the original bearing system of the hydraulic system. However, it is followed by other related functions of the machine. Followed by the update description; will be satisfied with the grinding machine processing skills of the machine. Whether the depiction of the mechanical layout is still the depiction of the electrical system should not ignore the anti-interference of the stepper motor system can be weaker characteristics. Suppose we have the above problems The solution has not been properly solved; it is assumed that all the components of the machine tool, especially the critical components, are still the specifications of the original mechanical hydraulic system machine; 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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