Double-ball-bar-based geometric error recognition method for five-axis machine tool front sway

A technology of geometric error and double ballbar, which is applied in the field of CNC machine tools, can solve the problems of few identification methods of swinging heads of five-axis CNC machine tools, many sources of geometric errors, and inability to provide machining accuracy, etc.

Inactive Publication Date: 2019-02-22
BEIJING UNIV OF TECH
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Problems solved by technology

However, compared with the three-axis CNC machine tool, due to the increase of the machine tool swing head, it leads to more sources of geometric errors, so that the existing five-axis CNC machine tool cannot provide the same machining accuracy as the three-axis CNC machine tool, thus hindering the five-axis Development and practical implementation of shaft precision machining
[0003] Over the past few decades, dual ballbars have been proven to be competent for the calibration of machine tool rotation axes, and many researchers have developed some effective methods to measure and identify geometric errors of five-axis CNC machine tools, but for five-axis There are few methods for identifying the geometric errors of the oscillating head of CNC machine tools
Moreover, existing identification methods can only identify geometric errors that have nothing to do with position

Method used

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  • Double-ball-bar-based geometric error recognition method for five-axis machine tool front sway
  • Double-ball-bar-based geometric error recognition method for five-axis machine tool front sway
  • Double-ball-bar-based geometric error recognition method for five-axis machine tool front sway

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Embodiment Construction

[0079] The method of the present invention specifically comprises the following steps:

[0080] Step 1, based on the multi-body theory, establish the equation of motion relationship between adjacent two bodies

[0081] Step 2, by analyzing the geometric error parameters of the swing head of the machine tool, according to the working principle of the double ballbar, identify the geometric error parameters of the swing head in the three measurement modes of X, Y, and Z of the machine tool. By establishing a reference coordinate system and a motion coordinate system on the workbench, the position coordinates of points A, C, and D are respectively obtained.

[0082] Step 3, according to the above analysis, in the measurement mode in the Y direction, identify the geometric error parameters, and establish the relationship between the position equation of the actual point D' and the theoretical point D in O-XYZ and the change in the length of the rod in the Y direction , identify ε ...

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Abstract

The invention discloses a double-ball-bar-based geometric error recognition method for a five-axis machine tool front sway. On the basis of motion conditions of an inclination head of a five-axis machine tool, three kinds of measurement modes of an X direction, a Y direction and a Z direction are put forward respectively; relative displacement equations of two DBB balls under three kinds of measurement modes are established respectively based on a HTM and a multibody system (MBS) theory; and a geometric error parameter of the inclination head is fully recognized. According to the invention, all error terms of the front sway are identified and the coupling phenomenon among parameters is avoided. Moreover, the identification precision and the universality are high; and the reference is provided for error recognition of the five-axis machine tool front sway.

Description

technical field [0001] The invention relates to a geometric error identification method of a five-axis machine tool swing head based on a double ballbar. The invention is suitable for numerically controlled machine tools and belongs to the fields of precision processing technology and industrial automation control. Background technique [0002] With the rapid development of precision machining of complex parts, the geometric shape of the workpiece is becoming more and more complex. In order to meet the requirements of precision machining, five-axis CNC machine tools are more and more widely used. Five-axis CNC machine tools have the advantages of higher material removal rate, positioning and orientation ability relative to the workpiece, and lower production cost. However, compared with the three-axis CNC machine tool, due to the increase of the swing head of the machine tool, it leads to more geometric error sources, so that the existing five-axis CNC machine tool cannot p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/404
CPCG05B19/404G05B2219/31434
Inventor 范晋伟齐国超邬昌军贾鑫张红亮
Owner BEIJING UNIV OF TECH
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