Modal testing method of numerical control machine tool feed system based on built-in sensors

A technology of CNC machine tools and feeding systems, which is applied in measuring/indicating equipment, metal processing mechanical parts, metal processing equipment, etc., can solve problems such as differences, achieve high precision and save test costs.

Active Publication Date: 2012-09-12
XI AN JIAOTONG UNIV
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Problems solved by technology

Therefore, the modal parameter results obtained by tradit...

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  • Modal testing method of numerical control machine tool feed system based on built-in sensors
  • Modal testing method of numerical control machine tool feed system based on built-in sensors
  • Modal testing method of numerical control machine tool feed system based on built-in sensors

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] refer to figure 1 , a modal test method for a feed system of a CNC machine tool based on a built-in sensor, comprising the following steps:

[0024] 1) According to the signal types that can be realized by the NC program of the test object, a signal is reasonably selected from the square wave signal, sine wave signal, frequency-swept sine signal, random signal, and pseudo-random signal as the excitation signal, and the excitation signal is determined. Basic parameters, and write the CNC program G code according to the excitation signal, so that the X-axis of the machine tool table moves according to the trajectory of the selected excitation signal;

[0025] 2) While the machine tool table is moving, use multi-channel signal acquisition equipment to simultaneously collect the current of the X-axis servo motor, the encoder of the X-axis servo motor and the sign...

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Abstract

The invention discloses a modal testing method of a numerical control machine tool feed system based on built-in sensors. The method comprises the following steps: a numerical control machine tool worktable is moved in accordance with given excitation signals, and at the same time servo motor current signals, motor coder signals and grating scale signals are acquired synchronously by using a signal acquisition device; the motor current signals are multiplied by the torque constant of a motor to produce the torque of the motor; second order difference is performed on the coder signals and the grating scale signals to produce acceleration signals of the worktable and angular acceleration of a screw rod; a frequency response function of the torque of the motor and an acceleration of the worktable and a frequency response function of the torque of the motor and an angular acceleration of the screw rod are calculated; fitting is performed on the two frequency response functions to obtain a fitted frequency response function; and axial modal parameters and torsional modal parameters are calculated finally. Compared with conventional modal testing methods, the novel method provided in the invention reduces cost of tests, and can realizes on-line testing of feed system modal parameters.

Description

technical field [0001] The invention relates to a modal test method for a feed system of a numerically controlled machine tool, specifically designing a modal test method for the feed system of a numerically controlled machine tool based on a built-in sensor. Background technique [0002] At present, CNC machine tools are developing along the direction of high speed and high precision, and the dynamic characteristics of machine tools are important factors affecting machining accuracy. As an important part of CNC machine tools, the feed system directly affects the processing quality and processing efficiency of the workpiece. The modal analysis is an important method to study the dynamic characteristics of the machine tool; through the modal analysis, the weak link of the machine tool structure can be found, so as to improve the machine tool structure and the dynamic characteristics of the machine tool. Modal analysis can also accurately calculate the bandwidth range of the ...

Claims

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Application Information

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IPC IPC(8): B23Q17/00
Inventor 梅雪松赵飞姜歌东邢铭宗
Owner XI AN JIAOTONG UNIV
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