Metal sheet laser precision perforating device assisting in foaming

Abstract

The invention provides a foaming-assisted sheet metal laser precision boring method. The method includes: (1) mounting a sheet metal workpiece on a machining base plate, coating with a layer of high-temperature foaming agent between the sheet metal workpiece and the machining base plate, and covering the upper surface of the sheet metal workpiece with a sealed suction hood; (2) sucking air outwards through the suction hood to enable the sealed suction hood to be always kept in a negative-state internally; (3) outputting a laser boring pulse through a laser device; (4) keeping a laser beam to continue irradiating for 1ms-500ms, and then ending the laser boring pulse; (5) moving a focus position of the laser beam to a next position needing boring, and repeating the steps (3) and (4) till all holes are machined; (6) after all the holes are machined, taking down the workpiece. Since the method is adopted for laser boring, good hole roundness, no burr at edges of outlets and small hole diameter deviation between hole inlets and the outlets can be guaranteed. The invention further provides a foaming-assisted sheet metal laser precision boring device.

Description

[0001] This application is a divisional application with an application date of March 19, 2014, an application number of 201410116060.X, and a title of "a method and device for laser precision drilling of metal sheets assisted by foaming". technical field [0002] The invention belongs to the field of laser processing, and in particular relates to a foaming-assisted laser precision drilling method and device for a metal sheet. Background technique [0003] Foaming agent is a kind of substance that makes the target substance form pores, and it can be divided into three categories: chemical foaming agent, physical foaming agent and surfactant. Chemical blowing agents are those compounds that release gases such as carbon dioxide and nitrogen after thermal decomposition, and form pores in the polymer composition; physical blowing agents are foam pores, which pass through the physical form of a certain substance The change is formed by the expansion of the compressed gas, the vol...

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Problems solved by technology

[0006] This kind of laser precision drilling technology generally requires small aperture, small deviation of inlet and outlet apertures, and good hole roundness, but it is difficult to achieve it with traditional laser drilling technology; moreover, the air blowing method used in traditional laser drilling technology , there must be burrs caused by slag splashing, adhesion and solidification at the exit edge of the metal hole, which cannot be eliminated

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