CN-121976148-A - Non-oriented silicon steel surface treatment device and method

CN121976148ACN 121976148 ACN121976148 ACN 121976148ACN-121976148-A

Abstract

The invention relates to the technical field of silicon steel surface treatment, in particular to a non-oriented silicon steel surface treatment device and a non-oriented silicon steel surface treatment method, wherein an independent laser glazing furnace is arranged between a continuous annealing furnace soaking section and a high-pressure nitrogen quick cooling section, the length of the laser glazing furnace is 3 m-6 m, a hearth shell adopts an airtight welding structure, the furnace adopts a high temperature resistant roller bottom structure, an adjustable gap type air inlet is arranged at the top, a micro negative pressure air extraction opening is arranged at the bottom, a heat insulation inner wall lining is arranged in the furnace chamber, a pair of heat resistant sealing rollers and micro positive pressure nitrogen curtains are respectively arranged at the inlet and the outlet of the laser glazing furnace, laser bins are symmetrically arranged at the top and the bottom of the furnace chamber, and laser scanning heads are arranged at the outside of the bin openings. The invention has the beneficial effects of solving the problems of insufficient adhesive force, poor uniformity, environmental pollution and the like of the traditional coating, realizing the remarkable improvement of the coating performance and providing a new technical approach for the application of non-oriented silicon steel in the fields of high-performance motors and the like.

Inventors

LIU WENPENG
HOU RUIQIANG
LI FUQIANG
GAO ZHENYU
CHEN CHUNMEI
LI YADONG
SUN CHAO
HU WANQING
LI ZHIJIAN
JIA ZENGBEN

Assignees

鞍钢股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260209

Claims (10)

1. The non-oriented silicon steel surface treatment device is characterized in that an independent laser glazing furnace is arranged between a continuous annealing furnace soaking section and a high-pressure nitrogen quick cooling section, the length of the laser glazing furnace is 3-6 m, a hearth shell adopts an airtight welding structure, a high-temperature resistant roller bottom structure is adopted in the furnace, a heat insulation inner wall lining is arranged in the hearth, an adjustable gap type air inlet is arranged at the top of the hearth, a micro negative pressure extraction opening is arranged at the bottom of the hearth, a pair of heat-resistant sealing rollers and micro positive pressure nitrogen curtains are respectively arranged at the inlet and the outlet of the laser glazing furnace, laser bins are symmetrically arranged at the top and the bottom of the hearth, and laser scanning heads are arranged outside the bin openings.
2. The non-oriented silicon steel surface treatment device according to claim 1, wherein the heat-insulating inner wall lining is made of light heat-insulating bricks and ceramic fiber board materials.
3. The non-oriented silicon steel surface treatment device according to claim 1 is characterized in that the outer layer of a bottom roller of the high-temperature-resistant roller bottom structure adopts a silicon carbide full-ceramic roller body, the inner layer is a metal mandrel with a water cooling channel, and the surface of the metal mandrel is coated with a zirconia heat-insulating coating.
4. The non-oriented silicon steel surface treatment device according to claim 1, wherein a clean nitrogen curtain is arranged on the inner side of the laser bin, and the nitrogen flow is 5-10L/min.
5. The non-oriented silicon steel surface treatment device according to claim 1, wherein the laser scanning head adopts pulse green laser, λ=515 nm and pulse width is 1-60 ns.
6. A surface treatment method based on the non-oriented silicon steel surface treatment device as claimed in any one of claims 1 to 5, characterized in that the specific method comprises the following steps: S1, maintaining the strip steel at 900-1000 ℃ at an outlet of a continuous annealing soaking section, directly entering an air atmosphere laser glazing furnace, and maintaining a normal pressure air atmosphere in the laser glazing furnace; S2, immediately scanning the strip steel by pulse green lasers which are arranged symmetrically up and down after the strip steel enters a laser glazing furnace, and triggering the formation of a surface Fe-Si-O liquid film by utilizing the self-height Wen Reshi to overlap laser transient overtemperature of 20-70 ℃; S3, directly entering a rear-end high-pressure nitrogen quick cooling section, adopting three-section composite cooling of aerosol cooling, high-pressure nitrogen spraying and laminar cooling, namely realizing quick cooling by aerosol spraying, enabling the atomized water pressure to be 0.2-0.4 MPa, enabling the air-water ratio to be 20:1, enabling high-pressure nitrogen spraying to accelerate cooling by 0.4-0.8 MPa, and finally enabling laminar nitrogen to be at uniform temperature, enabling the total cooling rate to be 40-100 ℃ to complete vitrification, and obtaining a compact amorphous glaze layer with the thickness of 50-100 nm.
7. The surface treatment method of the non-oriented silicon steel surface treatment device according to claim 6, wherein the silicon content of the strip steel is 1.5-3.5%.
8. The surface treatment method of the non-oriented silicon steel surface treatment device according to claim 6, wherein in the step S2, the laser power density in the laser scanning is 0.8-4.0J/cm < 2 >, the scanning speed is 10-100 m/S, and the light spot overlap ratio is 30-70%.
9. The surface treatment method of the non-oriented silicon steel surface treatment device according to claim 6, wherein the high-pressure nitrogen rapid cooling section in the step S3 reduces the temperature of the strip steel to below 700 ℃.
10. The surface treatment method of the non-oriented silicon steel surface treatment device according to claim 6, wherein the temperature of the outer wall of the furnace body is less than or equal to 60 ℃ when the laser glazing furnace is operated.

Description

Non-oriented silicon steel surface treatment device and method Technical Field The invention relates to the technical field of silicon steel surface treatment, in particular to a non-oriented silicon steel surface treatment device and method. Background The non-oriented silicon steel is used as an important soft magnetic material and is widely applied to manufacturing of various motor cores. The insulating coating on the surface has the functions of insulation, corrosion resistance and rust resistance, and can also improve the energy efficiency of the motor. However, the traditional insulating coating has poor adhesive force and is easy to fall off in the high-temperature treatment and machining processes. In addition, many conventional coatings contain chromate and other harmful substances that can cause environmental pollution during the production process and cause harm to human health. The uniformity of the coating is difficult to control in the coating process of the traditional coating, and the insulation performance and the mechanical performance are easily affected due to the inconsistent thickness of the coating. Some coating materials, such as phosphate coatings, reduce the sheet properties of silicon steel and increase the processing difficulty. Meanwhile, although the coating can reduce eddy current loss, the conventional coating has limited positive effects on the overall performance of the core due to non-uniformity problems after high temperature treatment. Disclosure of Invention In order to overcome the defects of the prior art, the invention provides the non-oriented silicon steel surface treatment device and the method, and a uniform Fe-Si-O glass phase glaze layer is generated on the surface of the non-oriented silicon steel through a laser induced oxidation-reduction reaction, so that the problems of insufficient adhesive force, poor uniformity, environmental pollution and the like of the traditional coating are solved, the remarkable improvement of the coating performance is realized, and a new technical approach is provided for the application of the non-oriented silicon steel in the fields of high-performance motors and the like. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: An independent laser glazing furnace is arranged between a continuous annealing furnace soaking section and a high-pressure nitrogen quick cooling section, the length of the laser glazing furnace is 3-6 m, a hearth shell adopts an airtight welding structure, a high-temperature resistant roller bottom structure is adopted in the furnace, a heat insulation inner wall lining is arranged in the hearth, an adjustable gap type air inlet is arranged at the top of the hearth, a micro negative pressure extraction opening is arranged at the bottom of the hearth, a pair of heat-resistant sealing rollers and micro positive pressure nitrogen curtains are respectively arranged at the inlet and the outlet of the laser glazing furnace, laser bins are symmetrically arranged at the top and the bottom of the hearth, and laser scanning heads are arranged outside the bin openings. Further, the heat-insulating inner wall lining is made of light heat-insulating bricks and ceramic fiber board materials. Furthermore, the bottom roller of the high-temperature-resistant roller bottom structure adopts a silicon carbide full-ceramic roller body as an outer layer, a metal mandrel with a water cooling channel as an inner layer and a zirconia thermal-insulation coating coated on the surface. Further, a clean nitrogen curtain is arranged on the inner side of the laser bin, and the nitrogen flow is 5-10L/min. Furthermore, the laser scanning head adopts pulse green laser, lambda=515 nm and pulse width is 1-60 ns. The surface treatment method of the non-oriented silicon steel surface treatment device comprises the following steps of: S1, maintaining the strip steel at 900-1000 ℃ at an outlet of a continuous annealing soaking section, directly entering an air atmosphere laser glazing furnace, and maintaining a normal pressure air atmosphere in the laser glazing furnace; S2, immediately scanning the strip steel by pulse green lasers which are arranged symmetrically up and down after the strip steel enters a laser glazing furnace, and triggering the formation of a surface Fe-Si-O liquid film by utilizing the self-height Wen Reshi to overlap laser transient overtemperature of 20-70 ℃; S3, directly entering a rear-end high-pressure nitrogen quick cooling section, adopting three-section composite cooling of aerosol cooling, high-pressure nitrogen spraying and laminar cooling, namely realizing quick cooling by aerosol spraying, enabling the atomized water pressure to be 0.2-0.4 MPa, enabling the air-water ratio to be 20:1, enabling high-pressure nitrogen spraying to accelerate cooling by 0.4-0.8 MPa, and finally enabling laminar nitrogen to be at uniform temperature, enabling the total cooling