Free-form surface three-axis ball-end cutter equal approximation error finish machining tool path generation method

A technology for approximating errors and surfaces, applied in the field of CNC machining toolpath generation, it can solve the problem of inability to generate other error toolpaths, etc., and achieve the effect of high-efficiency generation, reduction of calculation time, and reduction of iterations.

CN114859815APending Publication Date: 2022-08-05SUZHOU UNIV OF SCI & TECH
1 Cites 4 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-08-05
Patent Text Reader

Abstract

The invention discloses a free-form surface three-axis ball-end cutter equal approximation error finish machining tool path generation method which comprises the following steps: firstly, importing a free-form surface model to be machined, and setting data such as the radius, the line spacing, the approximation error maximum allowable value and the precision of a ball-end cutter; secondly, a group of section planes are planned according to the row spacing to intersect with the curved surface, the intersecting line serves as a cutter contact curve, and an equal-bow-height-error cutter contact iterative search method for driving cutter contact adjustment through the geometric distance is provided for the cutter contact curve on the section planes; the maximum distance between a cutter cutting envelope surface and a cutter contact track line is used as an approximation error, and an adaptive discrete method is adopted to carry out approximation error calculation; and finally, the cutter location points of the equal-bow-height-error cutter contact points serve as initial values, an equal-error cutter location point calculation method of step length self-adaptive adjustment iteration is provided, approximation errors between the cutter location points are all within an allowable range, and therefore the free-form surface three-axis ball-end cutter equal approximation error finish machining cutter path is obtained.
Need to check novelty before this filing date? Find Prior Art

Description

Technical field

[0001] The present invention is a technical field of computer aid manufacturing (CAM), especially about a CNC processing knife rail generation method. Background technique

[0002] The approach error of the CNC processing knife rail generally refers to the error caused by the processing of the tool in the direction of the tool. The approximation error is positively correlated with the distance between the adjacent knife and the distance of the knife point (that is, the length of the step). Generally, the approximate error is generally below the threshold by controlling the size of the step length. The step -long planning methods mainly include equal parameters, equidisting methods, step -long screening methods, and errors. In order to make the closer error of the knife rail not greater than the threshold, the step -length planning of the equivalent method and the equivalent method is more conservative, resulting in a large number of redundant knife points. The ste...

Examples

Embodiment

[0072] A typical implementation example of the present invention is as follows: below:

[0073] by Figure 7 (A) The curved surface is an example of the knife rail. The surface size is 120mm × 140mm × 38mm. The direction of the row distance is the positive direction of the X axis, and the error knife rail generated by generated is like Figure 7 (B) Show. In comparison, the step -long screening method is adopted and the number of initial knives per line of each row is selected to generate a knife rail, such as Figure 8 Show, evenly select the 7 -line knife rail, and its approximation error is distributed like Figure 9 (A), (b) shown, it can be seen that its distribution is uneven. The approximate error distribution of the error knife rail is like Figure 9 (C) Show, except for the last knife point corresponding to the end point of the trajectory of each row of knife (for a fixed point, cannot be adjusted), the approximation error of all other knife points is within the interval range...