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Collision-free machining method between tool and workpiece in NC machining based on visible cone theory

A technology for processing tools and processing methods, which is applied in the field of workpiece processing, and can solve problems such as the inability to quickly and efficiently realize collision-free processing, large amount of calculation, and complex collision inspection procedures.

Inactive Publication Date: 2017-05-10
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide a kind of NC machining tool-workpiece collision-free processing method based on the theory of visible cone, which can solve the problem of complex collision inspection program and large amount of computation in the prior art, which lead to Unable to quickly and efficiently achieve the purpose of collision-free processing

Method used

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  • Collision-free machining method between tool and workpiece in NC machining based on visible cone theory
  • Collision-free machining method between tool and workpiece in NC machining based on visible cone theory
  • Collision-free machining method between tool and workpiece in NC machining based on visible cone theory

Examples

Experimental program
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Effect test

example 1

[0068] Example 1: Five-axis CNC machining tool

[0069] According to the configuration of a given machine tool, the configuration code of the machine tool is analyzed, and the homogeneous coordinate transformation [11] is performed on the configuration code of the machine tool to calculate the feasible direction of the tool axis, and then obtain the reachable range of the machine tool. example, Figure 8 (a) For this machine tool processing coordinate system diagram, the corresponding machine tool configuration code is k=W / axz0yb / T, and the feasible tool axis direction calculated by using the homogeneous coordinate transformation matrix is o r t . Figure 8 (b) shows the result of projecting the feasible tool axis direction onto the unit sphere.

[0070]

[0071] It can be known from formula (4) that the tool axis vector of a five-axis machine tool can rotate around the A axis by an angle of α, and around the B axis by an angle of β, and its tool axis vector is r t＝ [si...

example 2

[0072] Example 2: Processing of impeller blades

[0073] Figure 9 The area where the tool collides on the machining of the impeller blades (part A is the collision part); Figure 11 Two situations of the spindle in machining (A represents the visible cone 1 of the point, B represents the tool axis r p1 ’, C represents the tool axis r p ′, D represents the reachable range of the machine tool, and E represents the tool axis r p2 ′, F represents the visible cone of the point 2); Figure 11 (a) The tool axis is outside the visible cone area (A represents the visible cone of the point, B represents the tool axis, and C represents the collision part), (b) the tool axis is located in the visible cone area after rotation (A represents the point that can be Cone of view, B stands for modified rear cutter axis).

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Abstract

The invention provides a method for no-collision machining between a numerical control machining tool and a workpiece based on a visual cone theory. The method comprises the following specific steps: 1, generating a visual cone for each machining point on the curved surface of the workpiece; 2, judging whether the visual cone is intersected with a cutter-axis vector or not, if so, no collision is generated, and otherwise, collision is generated; 3, for the visual cone corresponding to the happening of collision, calculating the cutter-axis vector, rotating to be at a minimum rotating angle of a visual cone region, and rotating the cutter-axis vector according to the minimum rotating angle so as to finish the no-collision machining between the machining tool and the workpiece. According to the method, whether collision between the numerical control machining tool and the workpiece exists or not is judged based on the visual cone theory, and adjustment is performed according to a judgment result, so that the collision in a machining process is avoided and the purpose of fast machining is achieved.

Description

technical field [0001] The invention belongs to the technical field of workpiece processing, and in particular relates to a non-collision processing method between a numerical control machining tool and a workpiece based on the visible cone theory. Background technique [0002] As the volume of the workpiece continues to decrease, the processing space becomes smaller, the structure becomes more and more complex, and the constraints become more and more, the collision between the tool and the workpiece becomes more and more likely. For example, the space between adjacent blades in the five-axis machining of complex curved parts is small, and the processing area is a semi-closed spiral cavity with large surface change angles. During processing, collisions and interference between the tool and the workpiece are very likely to occur, which seriously affects the accuracy of the workpiece. Processing quality, reduce tool life. Therefore, how to make the tool reach the workpiece s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/4061
CPCG05B19/4061
Inventor 刘志兵段裕刚王西彬何理论闫正虎刘彪
Owner BEIJING INSTITUTE OF TECHNOLOGYGY