Cutting gun protective cover for plasma perforation cutting of stainless steel thick plate and cutting method

Abstract

The cutting gun protective cover for plasma perforation cutting of the stainless steel thick plate comprises a protective outer cover and a clamping ring, an elastic plate is arranged at the upper end of the protective outer cover, clamping beads are embedded in the outer side of the elastic plate, a transition groove is formed in the clamping ring, and the protective outer cover and the clamping ring are in sliding fit through the clamping beads and the transition groove. The invention further discloses a plasma perforation cutting method for the stainless steel thick plate. According to the method, the cutting efficiency of the stainless steel thick plate with the thickness of 60 mm or above is improved by creatively utilizing the cutting characteristic of numerical control plasma and adopting the method of firstly perforating and then cutting the edge, and the problem of perforating and cutting of the stainless steel thick plate part with the thickness of 80 mm is solved. Through the cutting gun protective cover which is easy to manufacture and convenient to disassemble and assemble, the cutting gun head is effectively protected, the cutting gun head is prevented from being burnt out, the replacement frequency of quick-wear parts is reduced, and the cutting cost is saved.

Description

technical field [0001] The invention relates to a cutting protection device and a cutting method, in particular to a cutting gun protective cover for plasma perforation cutting of thick stainless steel plates and a cutting method, belonging to the technical field of plasma cutting. Background technique [0002] There are three main conventional cutting methods for stainless steel sheets: plasma cutting, water cutting, and laser cutting. Among them, plasma cutting is low in cost and high in efficiency, while water cutting is low in efficiency and high in cost and is more suitable for thick plate cutting. Laser cutting has relatively high efficiency and precision, but only Suitable for thin plate cutting. [0003] The design material for large low-temperature pressure vessels is 304L stainless steel plate, and the design thickness of the local pressure-bearing shell is 60mm to 80mm. When cutting materials, a 600A high-power CNC plasma cutting machine is used for cutting. For w...

AI Technical Summary

Problems solved by technology

In the cutting process of parts with a thickness of 60mm to 80mm, the cutting lead-in line of each part is firstly perforated. When plasma perforation is used, the torch shielding cap, nozzle, electrode and nozzle protective cup are very easy to be burned, resulting in consumable parts and consumable parts. Large, the 600A CNC plasma power supply and supporting equipment used are all imported from abroad. It is very expensive to replace a complete set of wearing parts of the torch. If these wearing parts are replaced frequently, the cutting cost will increase significantly

[0004] In the process of parts cutting, each part needs to start arc cutting. When cutting, the arc is first perforated to the contour line of the part for cutting. When the perforation is cut, the surface of the stainless steel plate instantly generates a high-temperature plasma arc, which will melt under the action of cutting high-pressure gas. Stainless steel oxidized slag is blown out. Because the temperature of the blown stainless steel slag is extremely high and the temperature reaches 1300°C, it is easy to stick to the shielding cap and nozzle protective cup, which will easily cause secondary burning damage. The cutting of the workpiece is interrupted, and the wearing parts need to be replaced before restarting. Unloading, resulting in low cutting efficiency, the wearing parts of the CNC plasma torch are more expensive, and the cutting cost will increase if the replacement frequency is high

[0005] At present, there is no good solution to effectively solve similar problems

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