Ball-head cuter processing shaft vector smoothing method based on BA type five-axis numerically-controlled machine tool

A tool axis vector and CNC machine tool technology, which is applied to the tool axis vector smoothing of five-axis CNC machine tools. Fluctuation and other problems, to achieve smooth and smooth motion, avoid sudden changes, reduce angular velocity and angular acceleration

Active Publication Date: 2017-08-15
SHANDONG UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problem of sudden changes and large fluctuations in the tool axis vector of the existing five-axis machining of complex curved surfaces with ball-end cutters, the present invention provides a smoothing method for the tool-axis vector based on BA-type five-axis CNC machine tool ball-end cutter processing

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  • Ball-head cuter processing shaft vector smoothing method based on BA type five-axis numerically-controlled machine tool
  • Ball-head cuter processing shaft vector smoothing method based on BA type five-axis numerically-controlled machine tool
  • Ball-head cuter processing shaft vector smoothing method based on BA type five-axis numerically-controlled machine tool

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Embodiment Construction

[0046] The present invention is based on a BA-type five-axis CNC machine tool ball-end cutter processing tool axis vector smoothing method, the basic process of which is as follows figure 1 As shown, its preferred specific implementation method includes:

[0047] Step A, establishing the relational equation between the tool axis vector of the ball-end cutter and the design variable of the cutter position. Described step A specifically is:

[0048] (1) The relationship equation between the tool axis vector of the ball head cutter and the design variable of the cutter position in the local coordinate system

[0049] like figure 1 As shown, let the ball-end cutter process the complex surface S: r(u,v), P cc (u cc ,v cc ) is any point on the surface, n cc is the unit normal vector of the point, O w x w Y w Z w is the workpiece coordinate system. Let r be the radius of the ball nose cutter, O L is the origin of the local coordinate system, in and point O L and P ...

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Abstract

The invention discloses a ball-head cuter processing shaft vector smoothing method based on a BA type five-axis numerically-controlled machine tool. The method comprises: a relation equation between a ball-head cuter shaft vector and a cutter spacing design variable is established; a motion transformational equation between the ball-head cuter shaft vector and drive shafts B and A of a five-axis numerically-controlled machine tool is established; a relation equation between a ball-head cuter spacing design variable and drive shafts B and A of the five-axis numerically-controlled machine tool is established; a design variable, an objective function and a constraint condition of ball-head cuter shaft vector smoothing are determined and a BA-type-five-axis-numerically-controlled-machine-tool-based ball-head cuter processing shaft vector smoothing mathematical model is established; and a solution method of the shaft vector smoothing mathematical model is determined. With the method disclosed by the invention, the rapid change of the drive shaft of the machine tool can be avoided and thus the drive shaft of the machine tool can work smoothly and stably, so that the angular velocity and the angular acceleration speed of the drive shaft of the machine tool can be reduced and thus the processing quality and the processing efficiency of the curved surface can be improved. The method has the high practical application value.

Description

technical field [0001] The invention relates to a tool axis vector smoothing method of a five-axis numerical control machine tool, in particular to a tool axis vector smoothing method based on a BA-type five-axis numerical control machine tool ball head cutter, and belongs to the technical field of five-axis numerical control machining. Background technique [0002] When using a ball-end cutter for five-axis machining of complex surfaces, due to the poor geometric properties of the surface, such as the surface's normal vector, main direction, curvature, etc., it is easy to cause sudden changes and large fluctuations in the generated ball-end cutter tool axis vector. Even if the simplest tool positioning method (such as the Sturz method) is used to process the above-mentioned curved surface area five-axis, it will cause a drastic change in the tool axis vector, which will affect the stability of the five-axis machine tool motion, the servo capability and increase of the feed a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/408
CPCG05B19/4086G05B2219/33263
Inventor 徐汝锋周喆郭前建于珊珊贺磊陈海真
Owner SHANDONG UNIV OF TECH
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