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Cutter axis vector interpolation method in 5-axis numerical control machining with rotation axis angular velocity smoothness characteristic being taken into consideration

A tool axis vector, rotary axis technology, applied in the field of five-axis CNC machining, can solve problems such as increasing the difficulty of tool attitude control

Active Publication Date: 2016-06-15
DALIAN UNIV OF TECH
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Problems solved by technology

The introduction of two rotational degrees of freedom in a five-axis CNC machine tool not only improves the processing flexibility, but also increases the difficulty of tool attitude control
So far, the tool axis vector interpolation method for five-axis CNC machining considering the smoothness of the angular velocity of each rotation axis of the machine tool in the machine tool coordinate system has not appeared in the relevant literature and patents

Method used

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  • Cutter axis vector interpolation method in 5-axis numerical control machining with rotation axis angular velocity smoothness characteristic being taken into consideration
  • Cutter axis vector interpolation method in 5-axis numerical control machining with rotation axis angular velocity smoothness characteristic being taken into consideration
  • Cutter axis vector interpolation method in 5-axis numerical control machining with rotation axis angular velocity smoothness characteristic being taken into consideration

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Embodiment Construction

[0033] The flow chart of a tool-axis vector interpolation method considering the smoothness of the angular velocity of each rotating axis in five-axis NC machining is shown in Fig. figure 1 shown. Taking the A-C double swing head type five-axis CNC machine tool as an example, the specific implementation process of the present invention is described in detail with reference to the accompanying drawings and implementation steps:

[0034] (a) The workpiece coordinate system ξ (w) Inverse transformation of the key tool axis vector to the machine tool coordinate system ξ (m) Next, get the corresponding rotation angles of the A and C axes of the machine tool. The key tool position set according to the cutting characteristics and the feasible space of the tool is in Be careful, is the workpiece coordinate system ξ (w) The tool axis vector below, that is In general, the key tool positions should include at least five (m≥5), that is, the first and last tool positions of the ...

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Abstract

The invention provides a cutter axis vector interpolation method in 5-axis numerical control machining with rotation axis angular velocity smoothness characteristic being taken into consideration and belongs to the technical field of 5-axis numerical control machining. The method solves the problem of refining interpolation of cutter axis vector at the place of an ordinary cutter location point according to key cutter location set based on cutting property and cutter feasible space. The method is characterized by, to begin with, calculating the rotation angle of each rotation axis corresponding to the key cutter axis vector under a machine tool coordinate system according to an inverse kinematics transformation equation; providing an approximation calculation formula of angular velocity of each rotation axis at the place of each refining interpolation cutter location point by utilizing a finite difference method; then, establishing a least square optimization objective function with the minimum angular velocity change of each rotation axis being an objective, and giving a solving method to obtain the rotation angle of each rotation axis at the place of the refining interpolation cutter location point; and finally, carrying out forward synthesis to obtain cutter axis vector at the place of the refining interpolation cutter location point. The method enables the angular velocity change of each rotation axis to be minimum and smooth and steady, thereby improving kinematics and dynamics performances of a five-axes numerical control machine tool in the process of machining parts of complex surfaces.

Description

technical field [0001] The invention relates to a tool axis vector interpolation method considering the smooth characteristics of the angular velocities of each rotating shaft in five-axis numerical control machining, belonging to the technical field of five-axis numerical control machining. Background technique [0002] Five-axis CNC machining is a landmark processing technology in modern industry, and it occupies a dominant position in the precision and complex surface processing of automobile, aerospace, shipbuilding, mold and other industries. The introduction of two rotational degrees of freedom in a five-axis CNC machine tool not only improves the processing flexibility, but also increases the difficulty of tool attitude control. For any tool contact, its corresponding tool axis vector must exist in the feasible processing space of the point to avoid possible local or global machining interference during the machining process, but in fact the tool axis vector at the to...

Claims

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Application Information

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IPC IPC(8): G05B19/41
CPCG05B19/41G05B2219/34085
Inventor 徐金亭孙玉文
Owner DALIAN UNIV OF TECH
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