Tool-axis vector smoothing method based on ab-type five-axis CNC machine tool machining circular knife
A tool axis vector and CNC machine tool technology, which is applied to the tool axis vector smoothing of five-axis CNC machine tools. Based on the field of AB-type five-axis CNC machine tool ring cutter processing tool axis vector smoothing, it can solve the sudden change and large fluctuation of the surface tool axis vector. and other problems to achieve smooth and smooth motion, avoid sudden changes, reduce angular velocity and angular acceleration
Active Publication Date: 2019-07-16
SHANDONG UNIV OF TECH
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[0006] In order to overcome the problem of abrupt change and large fluctuations in the tool axis vector of the existing five-axis machining of the complex curved surface with the circular knife, the present invention provides a smoothing method of the tool axis vector based on the AB type five-axis CNC machine tool for the machining of the circular knife
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[0043] According to the present invention, a method based on AB type five-axis CNC machine tool machining tool axis vector smoothing method, its basic process is as follows figure 1 As shown, preferred specific implementation methods include:
[0044] Step A, establishing the relational equation between the tool axis vector of the annular cutter and the design variable of the cutter position. Described step A specifically is:
[0045] (1) The relationship equation between the circular tool axis vector and the tool position design variables in the local coordinate system
[0046] like figure 1 As shown, assume that the circular cutter processes the surface S of the workpiece, 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. Let r be the truncated circle radius of the ring knife, O L is the origin of the local coordinate system, then in point O L and P cc Corresponding radial vector. At the same time, with point ...
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The invention discloses a tool axis vector smoothing method based on an AB type five-axis numerical control machine tool for machining annular cutters, which comprises the following steps: establishing a relational equation between an annular cutter axis vector and a tool position design variable; establishing an annular cutter axis vector The kinematic transformation equation between the rotary axes A and B of the five-axis CNC machine tool; establish the relationship equation between the design variables of the ring tool position and the rotary axes A and B of the five-axis CNC machine tool; determine the design of the vector smoothing of the ring tool tool axis Variables, objective functions and constraints, establish a mathematical model based on the AB type five-axis CNC machine tool axis vector fairing for machining circular cutters; determine the solution method for the above-mentioned tool axis vector smoothing mathematical model. This method can avoid the sharp change of the rotary axis of the machine tool, make the movement of the rotary axis of the machine tool more stable and smooth, greatly reduce the angular velocity and angular acceleration of the rotary axis of the machine tool, thereby improving the processing quality and efficiency of the curved surface, and has strong 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 an AB-type five-axis numerical control machine tool for circular knife processing, and belongs to the technical field of five-axis numerical control machining. Background technique [0002] When using a ring cutter to process complex surfaces in five axes, due to the poor geometric properties of the surface, such as the surface normal vector, main direction, curvature, etc., it is easy to cause sudden changes and large fluctuations in the generated ring 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 ...
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IPC IPC(8): G05B19/19
CPCG05B19/19G05B2219/35349
Inventor 徐汝锋程祥郑光明孟建兵
Owner SHANDONG UNIV OF TECH