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Multi-constraint five-shaft machining feeding rate setting method

A feed rate and multi-constraint technology, applied in digital control, electrical program control, etc., can solve problems such as low calculation efficiency

Inactive Publication Date: 2014-08-13
DALIAN UNIV OF TECH
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Problems solved by technology

This paper mainly considers the constraints of the driving characteristics of the machine tool, and does not involve the constraints of geometric characteristics and process characteristics. At the same time, the use of constrained nonlinear optimization methods is prone to problems such as low computational efficiency.

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  • Multi-constraint five-shaft machining feeding rate setting method
  • Multi-constraint five-shaft machining feeding rate setting method
  • Multi-constraint five-shaft machining feeding rate setting method

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Embodiment Construction

[0041] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and technical solutions. The process flow of the five-axis machining feed rate customization method under the constraints of geometric characteristics, process characteristics and driving characteristics proposed by the present invention is as follows figure 1 shown. Firstly, the processing path is represented by a double NURBS curve; the number of sampling points is determined, and the position of each sampling point is obtained by dividing the sampling points at equal intervals along the processing path; at each sampling point, according to the chord height difference constraint, the tool nose point velocity constraint, and the tool axis angular velocity constraint and sub-axis speed constraints to calculate the feed rate values ​​corresponding to each constraint, take the minimum value of the feed rate as the initial feed rate value, an...

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Abstract

The invention belongs to the technical field of mechanical numerical control machining, and relates to a multi-constraint five-shaft machining feeding rate setting method. According to the method, firstly, feeding rate values of sampling points are determined according to chord height difference constraints, cutter shaft angular speed and speed constraints of shafts of a machine tool, and an original feeding rate curve is constructed; by means of a proportional control algorithm, feeding rate values of acceleration or saltus poor points are determined again, so that acceleration and saltus gradually reduce according to the synclastic rule; a curve evolution strategy is adopted, the original feeding rate curve deforms in a one-point constraint or multi-point constraint mode, so that the original feeding rate curve deforms smoothly to a designated feeding rate updating position, and smooth transition of an adjustment area and a non-adjustment area of the feeding rate curve is achieved. Off-line setting of a five-shaft machining adaptability feeding rate is achieved, parallel constraint requirements of five-shaft machining geometric characteristics, process characteristics and machine tool drive characteristics are met, and machining accuracy, quality and efficiency are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of mechanical numerical control machining, and relates to a method for customizing the feed rate of multi-constraint five-axis machining. Background technique [0002] Five-axis CNC machine tools are widely used in CNC machining of complex-shaped parts. Adaptive feed rate customization is the key to ensure the smooth movement of the machine tool, reduce the machining vibration of the machine tool, and improve the processing quality of the parts. The quality of its planning directly affects the processing of parts. precision and efficiency. The object of the invention is to adaptively customize the feed rate in the expression form of spline curve and realize the maximization of the five-axis machining feed rate on the basis of satisfying the constraints of geometric characteristics, process characteristics and machine tool driving characteristics. Among them, the geometric characteristic constraint is the ch...

Claims

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Application Information

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IPC IPC(8): G05B19/19
Inventor 孙玉文赵洋贾振元郭东明
Owner DALIAN UNIV OF TECH
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