Heat cutting working machine and cutting method utilizing the same thermal cutting working machine

Abstract

A thermal cutting machine and a cutting method using the same are described, which employ a simple, long-life torch hood for effectively shutting off spatter, the torch hood enabling easy supervision of the cut condition of a workpiece and easy replacement of the consumable parts of the torch. In the thermal cutting machine for cutting a metal by a plasma arc or laser beam generated from the torch, a hood liftable by an actuator is disposed so as to surround the torch and a control unit is provided for giving an instruction to the actuator to lower the hood to a torch-shielding position.

Description

technical field [0001] The present invention relates to a thermal cutting machine such as a plasma cutting machine or a laser cutting machine, and a cutting method using the thermal cutting machine. In more detail, it is mainly about the technology of masking the droplets generated when cutting. Background technique [0002] Traditionally, when a thermal cutting machine such as a plasma cutting machine or a laser cutting machine is used for thermal cutting processing of a metal sheet (hereinafter referred to as "the workpiece"), the molten material of the cut part of the workpiece generated by the plasma arc or laser, etc., will be Sprays (sprays of molten metal) are formed due to the air pressure of the plasma gas ejected from the cutting torch and are scattered around. The smoke (metal vapor) and noise generated at the same time deteriorate the working environment in the factory. In order to solve this problem, various technologies have been developed to shield smoke, arc...

AI Technical Summary

Problems solved by technology

[0011] (1) In the actual plasma cutting, such as Figure 7 As shown, the workpiece slices chopped on the workbench lost the support of the workpiece support frame of the above workbench, and could not maintain the level and tilted

Since the protective cover B installed around the cutting torch moves horizontally at its lower end in a state close to the workpiece, even if the workpiece is slightly tilted, the lower part of the protective cover B and the above-mentioned upright There is a risk of damage to the protective cover B due to the interference of the workpiece

In addition, the interference between the lower part of the protective cover B and the above-mentioned workpiece will cause excessive load to the movement of the cutting torch in the horizontal direction, causing problems such as stopping the machine

[0012] (2) Corresponding to this problem, although it has been shown that as the material constituting the protective cover B, it is preferable to use a thin steel plate with moderate flexibility, a thin stainless steel plate, or a synthetic resin sheet with fire resistance, etc. When C interferes, the wall of the protective cover B may be greatly bent, and if the frequency of this interference is considered, it may still form an obstacle to the movement of the cutting torch

However, even if the protective cover is made of a thin steel plate, a thin stainless steel plate, or a fire-resistant synthetic resin sheet in the conventional technology, although the service life is longer than that of the above-mentioned heat-resistant cloth, it cannot be penetrated anyhow. The largest splash that occurs during fusion cutting will also melt and fall off, and the tiny gap between the workpiece and the lower end of the protective cover cannot maintain a close bond

Therefore, the effect of shielding droplets cannot be exerted for a long time, so it is not practical

[0015] (4) In addition, in order to easily observe the state of the plasma arc and the processing state of the workpiece, the side walls of the shield are preferably made of transparent synthetic resin plates, but in this case, droplets may adhere to the synthetic resin plate and melt it, so its transparency will be damaged in a short time

also impractical

[0016] (5) Furthermore, although the amount of cutting varies, it is necessary to remove the cap of the torch several times a day, and replace consumables such as nozzles and electrodes attached to the front end of the torch.

This has brought about the problem of rising production costs

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