Target knife utilizing laser surface texture optimization

A technology of surface texture and laser phase change hardening, which is applied in the field of targeted knives, can solve problems such as improving the surface performance of the knife body, and achieve improved freezing and ablation effects, improved wear resistance and high temperature oxidation resistance, and friction Reduced effect

Inactive Publication Date: 2017-07-21
UNIV OF SHANGHAI FOR SCI & TECH
4 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Both of the above two patents did not consider improving the surface performance of the kni...
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Method used

Because of its large power density, high surface strengthening quality, and low impact on original parts during processing, laser phase change hardening can be locally processed on complex original parts, and is easy to realize automatic control and no pollution. It is widely used on the surface of materials modification field. Laser phase transformation hardening, also known as laser quenching, uses a high-energy-density laser beam to irradiate the part of the blade that needs to be hardened, so that the area heats up sharply to form austenite, and then rapidly cools to obtain a fine martensite and other hardened layers. The surface hardness of the blade body treated with phase transformation hardening is high, and an extremely fine hardened structure can be obtained, so the wear resistance is improved. At the same time, due to the high speed of laser processing, the heat-affected area is small and the surface finish is high.
[0019] Laser remelting is the use of laser beams to melt the surface without adding any metal elements, which can achieve the purpose of improving the surface structure. Remelting the surface of the blade with a laser can release impurities, pores, and compounds, and at the same time refine the grains due to rapid cooling. Compared with the laser quenching process, the key to laser remelting treatment is to make the material surface undergo a rapid melting-solidification process. Its main features are: gen...
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Abstract

The invention relates to a target knife utilizing laser surface texture optimization. The target knife comprises a stainless steel target knife body. The surface of the target knife body is provided with optimized surface tissue obtained through laser phase transformation hardening or laser remelting, the superfine hardening tissue is obtained on the surface of the knife body, the knife body surface abrasion resistance and high temperature oxidation resistance are improved, and friction between the knife body and the human tissue is reduced. The stainless steel surface tissue optimization is achieved through laser phase changing hardening or laser remelting, the content is not changed, after laser surface texture hardening, the corrosion resistance, abrasion resistance and high temperature oxidation resistance of the stainless steel knife body surface are remarkably improved, when the knife body enters the human body and is pulled out from organ tissue, friction between the knife body and the human tissue is reduced, and a knife edge becomes smaller, and therefore pain of a patient is relieved.

Application Domain

Furnace typesSurgical instruments for cooling +1

Technology Topic

CorrosionHuman body +8

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  • Target knife utilizing laser surface texture optimization
  • Target knife utilizing laser surface texture optimization

Examples

  • Experimental program(1)

Example Embodiment

[0016] The present invention will be further described below with reference to the drawings and embodiments.
[0017] Such as figure 1 As shown, a targeted knife using laser surface texture optimization includes a stainless steel targeted blade body 1. The surface of the targeted blade body has an optimized surface tissue layer 2 through laser phase change hardening or laser remelting, so that the surface of the blade is extremely The thin hardened tissue improves the wear resistance and high temperature oxidation resistance of the blade surface, reduces the friction between the blade and the human tissue, improves the freezing and ablation effects, thereby reducing the knife edge and reducing the pain of the patient.
[0018] Laser phase change hardening is widely used in the field of material surface modification because of its high power density, high surface strengthening quality, small impact on the original during processing, local processing on complex originals, easy automatic control and no pollution. . Laser transformation hardening is also called laser quenching. High-energy density laser beams are used to irradiate the blade part that needs to be hardened to rapidly heat up the area to form austenite, and then rapidly cool to obtain a fine martensite and other hardened layers of structure. The surface hardness of the blade treated by phase change hardening is high, and a very fine hardened structure can be obtained, so the wear resistance is improved. At the same time, due to the high speed of laser processing, the heat affected area is small and the surface finish is high.
[0019] Laser remelting is to use a laser beam to melt the surface without adding any metal elements, which can achieve the purpose of improving the surface structure. Using laser to remelt the surface of the blade can release impurities, pores, and compounds, and at the same time, the crystal grains can be refined due to rapid cooling. Compared with the laser quenching process, the key of laser remelting treatment is to make the surface of the material undergo a rapid melting-solidification process. Its main features are: generally no alloying elements are added when the surface is melted, and the fusion layer and the material matrix are natural metallurgical bonding; during the laser fusion process, impurities and gases can be removed, and the structure obtained by quenching recrystallization at the same time, so there is High hardness, wear resistance and corrosion resistance; its melting layer is thin, the heat action area is small, it has little effect on the surface roughness and the original size, and it can even be used directly. Because the laser remelting surface heat treatment technology can improve the high hardness, wear resistance and corrosion resistance of the tool surface, it has a good application prospect in machinery, chemical and medical equipment industries. After laser remelting, the surface microhardness of the tool is greatly improved, and the corrosion resistance, wear resistance and high temperature oxidation resistance are also better.
[0020] The specific method of laser transformation hardening: irradiate a regular strong laser beam to the surface of the target knife, and quickly increase the surface temperature of the target knife to above the austenite transformation temperature and below the melting point. Through the rapid movement of the laser beam, the target knife The heated part quickly exchanges heat with the inside, and the cooling rate of the target knife surface is extremely fast, thereby completing the martensite transformation and obtaining extremely fine martensite.
[0021] Similarly, the specific method of laser remelting is to use higher power density (10~10W/cm 2 ) Laser beam scans the stainless steel surface of the target knife to melt the stainless steel on the surface, and then rapidly cool and solidify.
[0022] Such as figure 2 As shown, due to the very fast heating and cooling rate of laser remelting, the primary phase during solidification is the austenite phase. In this process, the higher cooling rate weakens the redistribution of the solute, making the primary austenite phase too late A transformation occurs, causing the ferrite to disappear.
[0023] In summary, the laser phase change hardening and laser remelting of the stainless steel surface of the blade can optimize the surface structure without changing the composition. The wear resistance of the surface of the blade is reduced, and its corrosion resistance and high temperature oxidation resistance are also improved, which can improve the freezing and ablation effects to a certain extent, and at the same time reduce the blade edge and reduce the pain of the patient.

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