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Non-linear error control method based on eight-parameter five-axis linear interpolation

A nonlinear error and linear interpolation technology, applied in the direction of program control, computer control, general control system, etc., can solve the problems such as the inability to effectively control the nonlinear error of the linear trajectory of the tool contact and the increase in the amount of machining programs, and achieve nonlinear Error control, the effect of ensuring position accuracy

Inactive Publication Date: 2019-11-26
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

[0004] In order to solve the above existing technical problems in the non-linear error control method in the five-axis linear interpolation process in terms of the increase in the amount of processing procedures caused by data densification and the inability to effectively control the non-linear error of the linear trajectory of the knife contact, the present invention provides a A Method for Effectively Controlling the Nonlinear Error of Tool Contact During Five-axis Linear Interpolation

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  • Non-linear error control method based on eight-parameter five-axis linear interpolation

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[0016] In the present invention, an A-C double turntable five-axis CNC machine tool will be used as an example to illustrate how to implement it. The implementation principles of other types of five-axis CNC machine tools are similar. The tool of the A-C double turntable five-axis CNC machine tool moves in parallel along the translation axis, and at the same time the workpiece is fixed on the worktable to realize two rotational movements of A and C around the X axis and around the Z axis, in the coordinates of translation and rotation. After synthesis, the spatial pose of the tool relative to the workpiece is finally formed. For the convenience of explanation, firstly, the mechanism of non-linear error generation of the linear trajectory of the tool contact during five-axis linear interpolation is elaborated in detail.

[0017] In the machine tool coordinate system, the mechanism of non-linear error at the tool contact point is as follows: figure 2 shown. Generally speaking...

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Abstract

The invention discloses a non-linear error control method based on eight-parameter five-axis linear interpolation, and is to solve the problem of control of non-linear error of a linear trajectory ofa tool contact point during five-axis linear interpolation. The method is characterized by establishing a mathematical model of the non-linear error of the linear trajectory of the tool contact pointaccording to a production mechanism of the non-linear error of the linear trajectory of the tool contact point caused by tool swing and the principle of motion coordinate transformation of a five-axismachine tool; when performing eight-parameter five-axis linear interpolation, calculating an interpolation tool center point and a corresponding interpolation tool contact point in the current interpolation period, and calculating a perpendicular foot position coordinate between the interpolation tool center point and the linear trajectory of the tool contact point and spatial distance between the interpolation tool center point and the linear trajectory of the tool contact point to determine a compensation and repair vector of the non-linear error; and finally calculating and outputting a new position coordinate of the interpolation tool center point to complete control of the non-linear error of the tool contact point in one interpolation period. The method has practical value in improving control accuracy of the linear trajectory of the five-axis linear interpolation tool contact point.

Description

technical field [0001] The invention relates to the technical field of computer numerical control (CNC), in particular to the control technology aspect of the non-linear error of the linear track of the tool contact due to the swing of the tool during five-axis linear interpolation in the field. Background technique [0002] Compared with the three-axis CNC machine tool, the five-axis CNC machine tool adds two rotation axes on the basis of three translational axes, which can effectively avoid problems such as tool interference and collision during processing, and can obtain better surface processing accuracy of parts , especially when processing complex free-form surfaces. On the other hand, linear interpolation, as the most basic trajectory control method of CNC system, can obtain better machining results in three-axis machining. The difference is that during five-axis machining, since the two rotating axes and the three translation axes will jointly realize the motion syn...

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Application Information

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IPC IPC(8): G05B19/41
CPCG05B19/41G05B2219/34083
Inventor 陈良骥王中州李慧莹睢英照魏广西高飞马龙飞赵波
Owner TIANJIN POLYTECHNIC UNIV
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