Corner Transition Toolpath Generation Based on Velocity-Blending Algorithm for Glass Edge Grinding

Kun Ren,Wenhua Chen,Yujia Pan,Danyan Jiang,Jun Pan,Xuxiao Hu

doi:10.1186/s10033-019-0398-7

Kun Ren, Wenhua Chen + Show 4 more

Open Access

https://doi.org/10.1186/s10033-019-0398-7

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Abstract

Sharp corners usually are used on glass contours to meet the highly increasing demand for personalized products, but they result in a broken wheel center toolpath in edge grinding. To ensure that the whole wheel center toolpath is of G1 continuity and that the grinding depth is controllable at the corners, a transition toolpath generation method based on a velocity-blending algorithm is proposed. Taking the grinding depth into consideration, the sharp-corner grinding process is planned, and a velocity-blending algorithm is introduced. With the constraints, such as traverse displacement and grinding depth, the sharp-corner transition toolpath is generated with a three-phase motion arrangement and with confirmations of the acceleration/deceleration positions. A piece of glass with three sharp corners is ground on a three-axis numerical-control glass grinding equipment. The experimental results demonstrate that the proposed algorithm can protect the sharp corners from breakage efficiently and achieve satisfactory shape accuracy. This research proposed a toolpath generation method based on a velocity-blending algorithm for the manufacturing of personalized glass products, which generates the transition toolpath as needed around a sharp corner in real time.

Highlights

Sharp corners usually are used on glass contours to highlight a unique, personalized appearance, but they create challenges in edge grinding
To achieve sharp-corner grinding for personalized glass product manufacturing, a real-time toolpath generation method based on a velocity-blending algorithm is proposed
5 Conclusions A toolpath generation method based on a velocity-blending algorithm for the manufacturing of personalized glass products was proposed

Summary

Introduction

Sharp corners usually are used on glass contours to highlight a unique, personalized appearance, but they create challenges in edge grinding. Without the consideration of grinding depth control, direct application of a velocity-blending algorithm can further increase the grinding depth due to the sacrifice of contour accuracy, which results in easy corner breakage. Corner rounding is another selection for sharp-corner machining and usually uses different kinds of parametric curves to correct the sharp corners and impose G1, G2, or higher-order continuity on the toolpaths. To achieve sharp-corner grinding for personalized glass product manufacturing, a real-time toolpath generation method based on a velocity-blending algorithm is proposed. When a wheel penetrates into the sharp-corner zone from point A (see Figure 3), the glass becomes thinner, but the redundant material becomes greater, thereby increasing the total grinding force F. There are three requirements for transition toolpath planning

C Pa vnor dn b

Toolpath Generation

Grinding Depth Constraint

Conclusions