CN112222639A - Method for cutting stainless steel with thickness of 0.5mm by laser - Google Patents

Abstract

The invention relates to a method for cutting stainless steel with the diameter of 0.5mm by laser, which comprises the steps of (1) removing oil stain and dust on the surface of the stainless steel, and keeping the surface of the stainless steel smooth; (2) cutting a stainless steel plate with the thickness of 0.5mm by using a ProCutter laser cutting gun, wherein the process parameters are as follows: the cutting speed is 14-16 m/min; the laser power is 1-2 kW; the gas pressure is 1-2 MPa; the defocusing amount is-1-0 mm; the working distance is 0.6-1.0 mm; the diameter of the cutting nozzle is 0.8-1.2 mm; the cutting gas was nitrogen. The invention has the advantages of stable process, repeatability, safety, stability and reliability, smooth and flat cutting seam, no slag adhering and good cutting seam quality.

Description

Method for cutting stainless steel with thickness of 0.5mm by laser

Technical Field

The invention relates to a method for cutting stainless steel, in particular to a method for cutting stainless steel with the diameter of 0.5mm by laser.

Background

304 stainless steel is a chromium-nickel stainless steel which is most widely used, and has good corrosion resistance, heat resistance, low-temperature strength and mechanical properties as a steel with wide application; good hot workability such as stamping, bending and the like, and no heat treatment hardening phenomenon (the use temperature is-196 ℃ below zero to 800 ℃). Corrosion resistance in the atmosphere, and timely cleaning to avoid corrosion if it is an industrial atmosphere or a heavily polluted area. Is suitable for processing, storing and transporting food. Has good processing property and weldability. Plate heat exchangers, corrugated pipes, household articles (class 1, 2 tableware, cabinets, indoor piping, water heaters, boilers, bathtubs), automobile parts (windshield wipers, mufflers, molded articles), medical appliances, building materials, chemicals, food industry, agriculture, ship parts, and the like.

Among stainless steels, the work hardening phenomenon is most prominent with austenitic and austenitic + ferritic stainless steels. For example, the strength sigma b of the austenitic stainless steel after hardening reaches 1470-1960 MPa, and the yield limit sigma s is increased along with the increase of sigma b; the austenitic stainless steel in the annealed state has sigma s not exceeding 30-45% of sigma b and reaches 85-95% after work hardening. The depth of the work hardening layer may be 1/3 or more of the cutting depth; the hardness of the hardened layer is improved by 1.4-2.2 times compared with the original hardness. Because the stainless steel has large plasticity, the product lattice is distorted during plastic deformation, and the strengthening coefficient is large; the austenite is not stable enough, and part of the austenite can be transformed into martensite under the action of cutting stress; in addition, the compound impurities are easy to decompose and disperse under the action of cutting heat, so that a hardened layer is generated during cutting. The work hardening phenomenon generated by the previous feeding or the previous working procedure seriously influences the smooth proceeding of the subsequent working procedure.

The conventional method of cutting stainless steel has many disadvantages: large cutting force, high cutting temperature, difficult breakage of chips, easy abrasion of cutters and large linear expansion coefficient. Based on the reasons, other cutting methods are adopted to obtain high-quality cutting seams, so that the cutting method has important significance and practical value, and an optimal cutting process window is not available for the stainless steel with the thickness of the plate at present.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a method for cutting stainless steel with the diameter of 0.5mm by laser, which can obtain high-quality cutting seams.

The invention is realized by the following technical scheme:

(1) removing oil stain and dust on the surface of the stainless steel, and keeping the surface of the stainless steel smooth.

(2) Cutting a stainless steel plate with the thickness of 0.5mm by using a ProCutter laser cutting gun, wherein the process parameters are as follows: the cutting speed is 14-16 m/min; the laser power is 1-2 kW; the gas pressure is 1-2 MPa; the defocusing amount is-1-0 mm; the working distance is 0.6-1.0 mm; the diameter of the cutting nozzle is 0.8-1.2 mm; the cutting gas was nitrogen.

Among the above-mentioned, the preferred adopts the supplementary cutting of manipulator among the cutting process, predetermines walking route, guarantees among the cutting process that gas pressure can not be too high, prevents that the barrier is touch to the cutting head, keeps away from combustible substance.

Among the above, the stainless steel is preferably 304 stainless steel.

In the invention, aiming at the stainless steel plate with the thickness of 0.5mm, the cutting process parameters are changed, so that a high-quality joint cutting section can be obtained, and meanwhile, a higher cutting speed is obtained.

The invention has the advantages that:

(1) the cutting seam is smooth and flat, no slag is attached, and the cutting seam quality is good.

(2) The cutting nozzle has long service life, the maintenance period of the cutting gun is prolonged, and the cost is saved.

(3) The cutting speed is high, the production efficiency is improved, and the delivery according to the schedule is ensured.

(4) The method for cutting stainless steel with the thickness of 0.5mm by laser has relatively low cost and relatively easy process realization, and further plays a reference role in cutting other stainless steel plates with different thicknesses.

Detailed Description

Example (b):

the stainless steel plate of 0.5mm thickness is purchased, greasy dirt and dust are got rid of to the surface, and the panel location, the relevant equipment of debugging laser instrument, whether the inspection cutting head lens need be changed, whether the cutting nozzle damages, adjustment defocus volume, set for mechanical arm parameter before the cutting, prepare nitrogen gas, the cutting process parameter is: the cutting speed is 15 m/min; the laser power is 1.5 kW; the gas pressure is 1.0 MPa; the defocusing amount is-0.5 mm; the working distance is 0.8 mm; the diameter of the cutting tip is 1.0 mm; the cutting gas was nitrogen. The cutting head is prevented from touching the barrier in the cutting process, and the flammable objects are far away in the cutting process, so that the equipment and personal safety are ensured.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (3)

1. A method of laser cutting 0.5mm stainless steel, the method comprising:

(1) removing oil stains and dust on the surface of the stainless steel;

(2) cutting a stainless steel plate with the thickness of 0.5mm by using a ProCutter laser cutting gun, wherein the process parameters are as follows: the cutting speed is 14-16 m/min; the laser power is 1-2 kW; the gas pressure is 1-2 MPa; the defocusing amount is-1-0 mm; the working distance is 0.6-1.0 mm; the diameter of the cutting nozzle is 0.8-1.2 mm; the cutting gas was nitrogen.

2. The method for laser cutting 0.5mm stainless steel according to claim 1, wherein a robot is used for assisting cutting during cutting, and a walking path is preset.

3. A method of laser cutting 0.5mm stainless steel as claimed in claim 1, wherein the stainless steel is 304 stainless steel.