Laser cutting method for angle of rotation

Abstract

The invention relates to a laser cutting method for a corner. In the invention, a PLC control program is adopted to control the speed magnification of a CNC numerical control system, so that a machine tool automatically reduces speed magnification and obtains relatively low cutting speed at a contour corner of a cutter path; after smoothly passing through the contour corner of the cutter path, the machine tool gradually raises cutting speed to the normal cutting speed, so that the machine tool can not only reduce cutting speed at the contour corner of the cutter path and smoothly carry out cutting without increasing nitrogen flow for supporting cutting, but also ensure that the machine tool can carry out cutting at normal speed at other sections of the cutter path, thus obtaining relatively high processing efficiency. Moreover, as the control of the processing machine tool is improved, insufficient cutting and rejected slag in the laser cutting process are greatly reduced, thus well protecting a focus lens from being polluted by cutting rejected slag, prolonging the service life of the focus lens and reducing attrition rate thereof.

Description

【Technical field】 [0001] The invention relates to a laser cutting method, which is especially suitable for laser cutting of thick plate stainless steel by a high-power laser cutting machine tool. 【Background technique】 [0002] When laser cutting machine tools cut thick plates (above 3MM) stainless steel plates, there are phenomena such as difficulty in cutting smoothly, impermeable cutting, and anti-slag at the corners of the contour of the cutting path. Scrap, resulting in an increase in the processing scrap rate of the machine tool, an increase in material costs, and an increase in maintenance costs for consumable parts (focusing lenses). [0003] The process of laser cutting machine cutting stainless steel plate is: use high-power-density laser beam to irradiate the metal plate, so that the metal material at the irradiated place will be melted, vaporized and ablated immediately, and at the same time, the high-speed auxiliary nitrogen flow coaxial with the laser beam will...

AI Technical Summary

Problems solved by technology

[0005] There are two ways to deal with this situation in the past laser cutting machine tools: one is to increase the cutting nozzle to increase the flow rate of high-speed auxiliary nitrogen gas used for cutting. Gas flow for removing molten metal is adequate, but nitrogen consumption increases

The second is to reduce the cutting speed. After the cutting speed is reduced, the flow rate of high-speed auxiliary nitrogen gas that actually needs to blow off the molten metal is also reduced. In this way, even if the high-speed air flow at the corner has a certain degree of disturbance and loss, the flow rate used to blow off the molten metal Airflow is still sufficient, but processing efficiency is reduced

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