Bar hot shear blade laser-quenching manufacturing process

Abstract

The invention discloses a bar hot shear blade laser-quenching manufacturing process. The process is characterized by comprising the following steps of: (1) removing greasy dirt and rust from the surface of the shear blade, and polishing the surface of the shear blade to ensure that a light absorption coating can be sprayed conveniently and uniformly; (2) uniformly coating a SiO2 light absorption coating on the surface of the shear blade to improve the CO2 laser absorption rate of the metal surface; (3) air-drying the coating; and (4) quickly scanning the surface of the shear blade on which the light absorption coating is coated by using a DL-HL-5000 type CO2 laser to quickly heat and cool the surface of the shear blade, wherein the process parameters are that: laser power is 2.5 to 4.5kW, round light spots are changed into rectangular light spots by a broadband integral mirror technology, the bandwidth size is that length*width is equal to 10mm*1mm, lap width is 0.5 to 1mm, and scanning speed V is equal to 200 to 1,000mm / min. An appropriate laser-quenching process is selected, good metallurgical bonding of a hard gold layer and a shear blade matrix is realized.

Description

technical field [0001] The invention relates to a manufacturing method for metallurgical equipment parts, in particular to a laser quenching manufacturing process for hot shearing and shearing edges of bars, belonging to the technical field of C21D1 / 06 (2006.01)I in the IPC International Patent Classification. Background technique [0002] Bar double-foot flying shear is one of the key equipments in small and medium-sized wire and bar rolling workshops. With the diversification of rolling products, from low-speed large-section rolling to high-speed small-section slitting rolling, the requirements for flying shears are getting higher and higher, especially the cutting edges of flying shears, the performance of which directly affects the rolling workshop. The productivity, success rate and fixed-length pass rate. At present, domestic hot shearing blades are mainly made of integral high-alloy steel. In order to pursue impact resistance, the hardness is reduced, resulting in in...

AI Technical Summary

Problems solved by technology

The above technical solution also pointed out that if the focused laser spot is directly irradiated on the cutting edge of the tool and the mold, the sharp corner of the cutting edge will be easily melted, which will cause the tool and the mold to be unusable

[0012] According to the applicant's search and verification: there is no domestic precedent for using laser quenching process to complete the local surface hardening treatment of the bar hot shear blade on the steel rolling equipment, and there is no related report abroad.