Manufacturing method of aircraft canopy glass forming plate

Abstract

The invention provides a manufacturing method for a glass forming plate of an aircraft canopy, and belongs to the technical field of aviation equipment. Aiming at a female die vacuum contact forming mode, a stretching / compression test of a test piece is carried out by using the same material under the same environment condition, and the stretching and compression limits of an organic glass plate under the optimal forming temperature condition are measured; the method comprises the following steps: adopting organic glass sheet gridding marking and destructive forming, finding out the position of the formed sheet exceeding the stretching / compression limit of the material through measurement, comparison and the like, and removing the part of the formed sheet, which does not influence the forming work, in the position of the formed sheet exceeding the stretching / compression limit of the material; parts which have a hindering effect on the glass mold pasting process in the forming work are reduced, the glass is easier to paste the mold under the condition that the forming temperature and the pressure difference of the vacuum pump are kept at the optimal value, and the manufacturing quality and the success rate of the canopy glass are improved.

Description

technical field [0001] The invention belongs to the technical field of aviation equipment, and relates to a method for manufacturing an aircraft cockpit cover glass forming plate. Background technique [0002] Female mold vacuum contact forming is a common manufacturing method for the canopy glass of most military trainers and some fighter jets. Before forming, select the aviation plexiglass flat wool whose specifications meet the design requirements, and manufacture the forming board by sawing off the excess wool after scribing. When molding (such as figure 1 shown), the plexiglass forming sheet 101 preheated to a high elastic state is placed in the female mold of the forming mold tire 103, the position is limited by the pressure frame 102, and the pressure difference caused by the vacuum pump through the vacuum pipeline 104 is used to make the forming Sheet metal molding. [0003] When the aircraft canopy glass is formed, the molded frame and the flannelette on the surf...

AI Technical Summary

Problems solved by technology

[0004] In the existing manufacturing method of shaped glass sheet, when all aspects of conditions reach the optimum value (such as the highest temperature value that can ensure no serious indentation, the maximum pressure difference that can ensure no obvious pores, etc.), the glass is not easy to mold In order to complete the molding work, it can only be remolded, and try to change the temperature, pressure difference and other conditions to force it to be molded, resulting in molding temperature or vacuum pump pressure difference higher than the optimal value, so that the formed canopy glass appears Optical performance defects such as waves, ripples, refraction, and pores

In order to eliminate the defects, we can only try to adjust the temperature or pressure difference again, and re-shape, but the molding quality is still not guaranteed, resulting in repeated molding of the canopy glass, and in serious cases, the molding times exceed the specified number of times and are scrapped

[0005] To sum up, the existing manufacturing method of shaped glass sheet only considers the reservation of the forming allowance, and does not consider the influence of the shape characteristics of the glass blank sheet on the difficulty of attaching the mold under the same temperature and pressure difference conditions.

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