A comprehensive test platform and test method for thermal error causes of CNC machine tool spindle
A comprehensive test, CNC machine tool technology, applied in the direction of mechanical bearing testing, etc., can solve the problem of not considering the influence of bearing installation error, not analyzing and studying the spindle, not establishing the operating characteristics of the spindle bearing, and the thermal error of the spindle, so as to eliminate additional errors and improve The effect of testing accuracy
Inactive Publication Date: 2017-05-17
WUHAN UNIV OF TECH
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Problems solved by technology
There is no analysis and research on the root cause of the thermal error of the spindle, the relationship between the operating characteristics of the spindle bearing, the cutting force and the thermal error of the spindle is not established, especially the influence of the bearing installation error on the thermal error is not considered, and only the thermal error of the spindle unit is analyzed External manifestations and other issues, these test devices and test methods cannot fundamentally solve the problems existing in thermal error research
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[0039] The present invention will be further described below in conjunction with specific examples and accompanying drawings.
[0040] A comprehensive test platform for the thermal error of the CNC machine tool spindle, such as figure 1 As shown, it includes:
[0041]The main shaft fixing device includes the main shaft unit box 107, the main shaft unit box 107 is provided with a bearing, the main shaft 108 is sleeved in the bearing, and the lock nut 103 is used to fix the inner ring of the rear end bearing. The leaked sealing ring 106 and the main shaft unit box 107 are fixed on the vibration isolation platform; the main shaft unit box 107 is provided with a cavity 105 for applying pretightening force to the bearing; the front end of the main shaft is connected with the handle shaft 409 (this In the embodiment, the pull rod 109 is connected to the handle shaft 409), the other end is the tail end, and the two ends of the main shaft are provided with end caps 111.
[0042] The...
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The invention provides an integrated testbed for numerical control machine spindle thermal error causes. The integrated testbed comprises a spindle fixing device, a driving system, a transmission device, a signal acquisition module, a bearing pre-tightening force loading system, a bearing pre-tightening force feedback control system, a bearing installation error simulation device and a spindle cutting force simulation loading device. The spindle fixing device comprises a spindle unit box, a bearing is arranged in the spindle unit box, and a spindle is nested in the bearing; a cavity used for applying pre-tightening force to the bearing is arranged on the spindle unit box. The bearing pre-tightening force feedback control system is used for acquiring a theoretical value of bearing pre-tightening force through the spindle speed and the temperature distribution of the outer ring of the bearing, comparing the theoretical value of the bearing pre-tightening force with the acquired pre-tightening force applied to the bearing and controlling the bearing pre-tightening force loading system to regulate the size of the pre-tightening force after performing PI regulation. By the testbed and a test method, an integrated test device is provided for researches on operating characteristics of the bearing of the spindle unit, the thermal error causes of the spindle can be discovered, and the size is predicated accurately.
Description
technical field [0001] The invention relates to research on the thermal error of the spindle of a numerical control machine tool, in particular to a comprehensive test platform and a testing method for the causes of the thermal error of the spindle of a numerical control machine tool. Background technique [0002] In order to meet the development needs of modern manufacturing industry, the spindle of CNC machine tools is constantly developing with the goal of high speed and high precision. As the carrier of the tool or workpiece, the thermal error of the spindle is directly related to the surface quality of the workpiece. Thermal errors are unavoidable, and thermal error prediction and compensation can only be completed by exploring its mechanism. There are various factors affecting thermal error, which can be mainly divided into three categories: bearing operating characteristics, spindle cutting force and bearing installation error. Bearing is the main heat source in the...
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IPC IPC(8): G01M13/04
Inventor 周祖德董艳方刘明尧刘繄严才根
Owner WUHAN UNIV OF TECH