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Error-control-based smooth interpolation method for five-axis NC (numerical control) system

An error control and interpolation technology, applied in the direction of automatic control devices, manufacturing tools, metal processing machinery parts, etc., can solve the problems of processing influence, tool axis attitude error, track error, etc., and achieve the goal of improving stability and processing accuracy Effect

Active Publication Date: 2014-05-21
中国科学院沈阳计算技术研究所有限公司
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Problems solved by technology

[0003] The existing nonlinear error control methods are only aimed at the path error synthesized by each axis, or only at the attitude error of the tool axis. Considering that these two errors are caused by the nonlinear motion of five-axis machining, they will affect the machining

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  • Error-control-based smooth interpolation method for five-axis NC (numerical control) system
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  • Error-control-based smooth interpolation method for five-axis NC (numerical control) system

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] In this embodiment, the AC double turntable five-axis machine tool is the research object, such as figure 1 Shown is a structural schematic diagram of the AC double turntable five-axis machine tool used in the method of the present invention. figure 2 Kinematic chain for this type of machine tool. The interpolation method based on error control includes the following steps: establishing the forward and reverse kinematics equations of machine tool kinematics; Carry out tilt processing; calculate the nonlinear error at the midpoint, if it exceeds the allowable error, use the interpolation method based on the ideal tool position trajectory for the linear axis.

[0030] For the processing interval composed of adjacent tool position data, the interpolation process is as follows Figure 4 shown.

[0031] Step 1) Establish the forward and...

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Abstract

The invention relates to a five-axis machining technology in the technical field of NC (numerical control), in particular to an error-control-based smooth interpolation method for a five-axis NC system. According to the method, a rotary shaft of the five-axis NC system is interpolated in a tool vector interpolation mode based on detection of singular points; a linear shaft of the five-axis NC system is interpolated in a linear interpolation mode based on the ideal trajectory of cutter location points. In a vector interpolation process, over-large nonlinear errors nearby the singular points and over-large motion of the rotary shaft are avoided through tool shaft vectors of an inclined midpoint position for a machining interval in a singularity area; the linear shaft is interpolated in a mode based on the ideal trajectory of the cutter location points at an interval with over-large trajectory nonlinear errors, so that trajectory errors can be effectively reduced. Compared with single linear interpolation and single vector interpolation, an error-control-based smooth interpolation strategy has the advantages that the machining accuracy is improved, and the machining stability of a machine tool is improved as well.

Description

technical field [0001] The invention relates to a five-axis machining technology in the technical field of numerical control, in particular to an error control-based smooth interpolation method for a five-axis NC system. Background technique [0002] Five-axis CNC machining can effectively avoid the interference between the tool and the part by changing the direction of the tool axis, better match the tool geometry and the workpiece surface, control the area where the tool participates in cutting, adjust the cutting force and reduce tool wear, thereby improving processing efficiency and improving Processed surface quality. However, the emergence of the rotary axis also brings the problems of difficult control of the tool attitude and large nonlinear errors. At present, there are two main interpolation methods for motion axes in CNC linkage control: linear interpolation and vector interpolation. The linear interpolation method is simple to calculate and has a short executio...

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Application Information

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IPC IPC(8): B23Q15/12
CPCB23Q15/12
Inventor 林浒王峰刘峰郑飂默杨磊耿聪
Owner 中国科学院沈阳计算技术研究所有限公司
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