A CNC machine tool backlash monitoring method for a full-closed-loop servo system
A backlash and servo system technology, applied in measuring devices, measuring/indicating equipment, metal processing machinery parts, etc., can solve problems such as high requirements for operators and inability to measure backlash, and achieve a high degree of automation
Inactive Publication Date: 2016-05-18
XIAN RUITE RAPID MFG ENG
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[0003] The patent application number 201010557048.4 uses a dial indicator to test the machine tool backlash at certain points. This method cannot measure and describe the backlash at any point in the entire feed stroke, and it is a manual test. more demanding
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[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. In this embodiment, a turning-milling compound machining center is used for monitoring.
[0029] Machine tool linear servo shaft transmission chain structure such as figure 1 As shown, the permanent magnet synchronous AC servo motor transmits the torque to the ball screw through the gear reduction mechanism, and the ball screw converts the rotary motion into the linear motion of the table along the well-lubricated guide rail through the nut. The control strategy adopts the three-loop control of position loop, speed loop and current loop. The position loop is a proportional gain P controller, and the speed loop and current loop are PI controllers. The whole system diagram is as follows figure 2 shown. The speed feedback signal of the speed loop is the speed signal obtained by the difference of the rotation angle signal at the output shaft end of the mo...
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Disclosed is a reverse gap monitoring method of a numerical control machine tool of a fully-closed loop servo system. The method comprises continuously sampling the positions of a motor and a workbench through the build-in encoder of the machine tool and taking the position of the motor as a reference position to calculate the reverse gap sequence c (n) in a reference position sequence xm (n). Compared with traditional reverse gap testing methods, the reverse gap monitoring method of the numerical control machine tool of the fully-closed loop servo system does not need external sensors, can achieve testing of full-process reverse gaps and accordingly can test the reverse gap conditions more accurately and more comprehensively compared with by representing full-process gaps with the gap value of a point. Meanwhile, the method is high in automation degree and obtains the reverse gap contour errors of the fully-closed loop numerical control machine tool by monitoring and calculating the reverse gap condition of the machine tool in real time to achieve monitoring and control of the contour errors and to ensure that the contour errors can be within an allowed error range all the time. The reverse gap monitoring method of the numerical control machine tool of the fully-closed loop servo system is relatively high in automation degree, low in monitoring cost and high in monitoring reliability.
Description
technical field [0001] The invention relates to the field of machine tool precision monitoring and control, in particular to a method for monitoring the backlash of a numerically controlled machine tool in a full-closed-loop servo system. Background technique [0002] The following error and contour error of the machine tool are the main evaluation indicators of the accuracy performance of the machine tool. The following error refers to the difference between the single-axis servo command position and the actual position, and the contour error refers to the orthogonal distance from the actual position to the command trajectory. When the servo axis changes the feed direction, there will be a backlash. For the CNC machine tool of the fully closed-loop servo system, the occurrence of the backlash will seriously cause the huge time lag and following error of the servo system. The huge following error also leads to the contour Larger contour errors during machining. For example,...
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IPC IPC(8): B23Q17/00G01B21/16
CPCB23Q17/007
Inventor 林京史生宇王琇峰赵明
Owner XIAN RUITE RAPID MFG ENG