Study on laser degumming and non-destructive technology of rubber press valve

Abstract

Laser degumming is a new technology in the maintenance of press valve, which has the advantages of high efficiency, high accuracy, complete degumming and low pollution. However, the metal matrix is prone to thermal damage when subjected to laser action. It is found that 1Cr18Ni9Ti is the most prone to oxidation. If 1Cr18Ni9Ti is not damaged, 2A12 and HPB59 materials will not be damaged under the same laser parameter processing. The internal metallographic structure of 1Cr18Ni9Ti sample does not change when it is oxidized at the boundary without illumination. Therefore, if the nonilluminated surface does not oxidize, it can be considered that the internal metallography of the press valve has not changed; The simulation model of rubber removal was established, and it was found that the method of switching off and on light could control the temperature in the process. When the time ratio of switching on and off light was 1: 3, the rubber residue could be completely removed without damaging the rubber press valve. The simulation parameters are applied to the actual parts experiment, and the simulation results are verified to be reliable, the temperature is controllable and the parts have no damage. The research results in this paper can achieve the task of rubber removal without damaging the substrate.