Machining method of die core surface of graphite die for glass hot bending

Abstract

The invention provides a machining method of a die core surface of a graphite die for glass hot bending. The die core surface comprises a hook face structure, the machining method includes the step ofadopting a laser device to irradiate the die core surface of the graphite die so as to achieve the polishing effect on the dire core surface, the irradiation scope of the laser device is larger thanor equal to the projection scope of the die core surface on the horizontal face, the moving speed of irradiation burning of laser light on the die core surface is 200-20000 mm / s, all paths generated when the laser light moves on the die core surface each comprise a plurality of parallel straight lines, the number of times of irradiation burning of the laser light on the die core surface is two ormore, and the parallel straight lines of every two adjacent laser paths are crossed. By means of the machining method, the poor appearance generated after CNC of the graphite die can be removed, thedie accuracy is not influenced, the die polishing time is saved, the conditions such as edge collapse and face collapse on the die core surface are avoided, and the service life of the die is prolonged.

Description

technical field [0001] The invention relates to the field of graphite mold processing, in particular to a method for processing the core surface of a graphite mold for glass hot bending. Background technique [0002] In the processing of 3D touch screen glass for mobile phone panels, the hot bending process of glass can be regarded as the first process, and the quality of hot bending molds is directly related to the quality of glass products. Graphite is currently selected as the most suitable for hot bending of glass due to its characteristics. Material, graphite mold came into being. The core of the graphite mold refers to the part of the mold that is in direct contact with the glass. The surface of the core of the graphite mold contains a curved surface structure corresponding to the curvature of the target glass product for hot bending. [0003] Because during the hot bending process of the glass, all defects on the surface of the graphite mold core will be reflected on...

AI Technical Summary

Problems solved by technology

First, the slight defects on the surface of the mold core after manual polishing will be enlarged and intuitively displayed on the hot-bent glass; due to the differences in the operator's personal techniques, it is difficult to guarantee the consistency of the polishing quality of the same type of mold; and the manual polishing process consumes The time is too long, and a single mold needs 2-3 hours to complete the polishing; and the corner position and dead corner of the graphite mold are more difficult to guarantee the quality

Second, it is difficult for graphite molds to remove defects after CNC by sandblasting; even if the defects can be removed by adjusting the sandblasting pressure, sand particle size, and sandblasting time, the surface of the mold core is prone to sagging and collapse. Therefore, the sandblasting process is generally not suitable for polishing graphite molds with curved surfaces.

Third, it is difficult to guarantee the precision of the graphite mold after drying, the sharp corners and rounded corners of the mold are easy to collapse, and the surface of the mold core is easy to oxidize after passing through the high temperature of the hot bending machine

[0005] The above-mentioned defects have always been the technical bottleneck that those skilled in the art need to break through. In order to overcome the problems of long time-consuming surface treatment of the existing graphite mold core, unstable surface quality of the mold core, and unguaranteed accuracy, a new glass hot-bending method is needed in this field. Surface processing method of mold core with graphite mold