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Path Planning Method of Advance and Retreat Tool in NC Polishing

A technology of path planning, knife advance and retreat, applied in the direction of digital control, electrical program control, etc., can solve problems such as traces of knife advance and retreat, and achieve the effect of improving processing quality

Active Publication Date: 2017-01-25
BEIJING GUOWANG OPTICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method for planning the advance and retreat path of the CNC lapping tool in order to solve the problem that the lapping tool adopts the straight-line advance and retreat mode in the prior lapping and polishing process, resulting in traces of the advance and retreat cutters.

Method used

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  • Path Planning Method of Advance and Retreat Tool in NC Polishing
  • Path Planning Method of Advance and Retreat Tool in NC Polishing
  • Path Planning Method of Advance and Retreat Tool in NC Polishing

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specific Embodiment approach 1

[0018] Specific implementation mode 1. Combination figure 1 with figure 2 Description of this embodiment, the method for planning the advance and retreat path of the tool in CNC lapping and polishing is used to realize the planning of the path of entry and exit of the lapping tool in the process of CNC lapping and polishing. The method includes:

[0019] The first step is to determine the effective processing path end point P s (x,y,z), the normalized direction vector at the endpoint Then calculate the direction angle α of the direction vector of the endpoint;

[0020] The second step is to calculate the endpoint P s (x, y, z) corresponding polar diameter ρ and polar angle θ s ;

[0021] The third step is to calculate the time T of the tool advance and retreat according to the second safety height value h" and the speed v of the tool advance and retreat, and then calculate the total angle of the tool advance and retreat process according to the angular velocity ω of t...

specific Embodiment approach 2

[0033] Specific embodiment two, combine figure 1 with figure 2 Describe this implementation mode, this implementation mode is an embodiment of the path planning method for advancing and retreating tools in CNC grinding and polishing described in the first specific implementation mode:

[0034] (1) Determine the end point P of the effective machining path 2 according to the surface profile 1 of the workpiece s (x,y,z), the normalized direction vector at the endpoint Then calculate the direction angle α of the direction vector of the endpoint:

[0035] α = arccos(e sz )

[0036] (2) Calculate the endpoint P s (x, y, z) corresponding polar diameter ρ and polar angle θ s :

[0037] ρ = x s 2 + y s 2 θ...

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Abstract

The invention provides a cutter advancing and retreating path planning method in numerically controlled grinding and polishing, relates to a grinding and polishing path planning method, and solves a problem of appearance of cutter advancing and retreating traces in the existing grinding and polishing process caused by the fact that a linear cutter advancing and retreating mode is adopted a grinding and polishing tool. The cutter advancing and retreating path planning method in numerically controlled grinding and polishing comprises the steps that a starting point and a terminal point of an effective grinding and polishing path and a normalized direction vector are calculated firstly; then total time of cutter advancing and retreating and a second safety height position vector of the cutter advancing and retreating path are calculated according to a given safety height value and cutter advancing and retreating speed; furthermore, position vectors and direction vectors of all the cutter position points of the spiral cutter advancing and retreating path; moreover, directions of the spiral cutter advancing and retreating path and the effective polishing path are adjusted so as to be maintained to be consistent; and finally the position vector of the first safety height is calculated. The invention is suitable for the field of numerically controlled grinding and polishing so that uniform removal caused by partial contact of a grinding and polishing mould and a processed piece can be avoided and thus avoidance of the cutter advancing and retreating traces is facilitated.

Description

technical field [0001] The invention relates to a path planning method for grinding and polishing, in particular to a spiral path planning method for a polishing tool advancing and retreating in numerically controlled grinding and polishing. Background technique [0002] CNC grinding and polishing is a processing procedure to obtain high-precision surface quality, and the path planning of the polishing tool is a key technology in the entire processing process. The path of the polishing tool is mainly composed of two parts: the effective processing path and the advancing and retreating path of the polishing tool. The effective processing path is the path to achieve deterministic removal of materials. Currently, the commonly used effective processing paths include helical path, raster scanning path, and pseudo-random path. The advancing and retreating tool path refers to the path where the polishing tool approaches or leaves the machined surface at the beginning or end of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/19
CPCG05B19/19
Inventor 刘健王绍治隋永新杨怀江张春雷
Owner BEIJING GUOWANG OPTICAL TECH CO LTD