Laser in-situ alloying method and device for speed skating ice skate blade tube

Abstract

The invention belongs to the technical field of laser surface modification, and discloses a laser in-situ alloying method and device for a speed skating ice skate blade pipe, a feeding device cooperates with a clamping device to complete clamping and positioning of various types of ice skate blade pipes, a laser device generates a heat source, nitrogen or carbon dioxide on the surface of the ice skate blade pipe is micro-melted under the thermal action of laser energy, and the surface of the ice skate blade pipe is micro-melted; nitrogen or carbon elements are provided for ice skate blade pipe surface in-situ alloying, the turnover device completes ice skate blade pipe multi-angle laser machining, the movable workbench ensures an accurate laser scanning path, and finally ice skate blade pipe surface laser in-situ alloying machining is completed. A laser in-situ alloying method for the speed skating ice skate blade pipe is adopted, nitrogen or carbon dioxide and laser energy are utilized, and the heat input amount of a system is adjusted, so that component regulation and control of micro-molten metal on the surface of the ice skate blade pipe are achieved, and a surface alloying layer which is good in hardness, uniform in permeation layer and improved in strength is formed in situ; the method has the advantages of improving mechanical properties of the ice skate blade pipe, prolonging service life of products, improving production efficiency and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of laser surface modification, and in particular relates to a method and a device for laser in-situ alloying of a speed skating blade tube. Background Art

[0002] In ice sports, the blade tube is a key component that connects the skates and the blades, and has extremely strict technical requirements. With the development of ice sports and the advancement of manufacturing technology, people have put forward higher requirements on the comprehensive performance of the blade tube. During long-term service, the blade tube will bend and deform due to the impact load, which seriously shortens the service life of the blade.

[0003] At present, medium carbon steel, such as 55 steel, 55Mn steel, etc., is commonly used as the material for ice skate tubes. Medium carbon steel has the advantages of being affordable, having good machining performance, and being impact-resistant. Good strength and hardness enable the ice skate tubes to better resist the effects of complex forces such as impact during the skating process. However, ice skate tubes are often subjected to alternating loads (including impact and low-speed heavy loads) during use, and long-term service will still lead to material fatigue damage and deformation, which poses a serious threat to the personal safety of users. Therefore, improving the comprehensive performance of ice skate tubes has become a key technology that needs to be solved urgently.

[0004] Based on the above problems, a laser in-situ alloying method for ice skate tubes was proposed, and a special alloying device was developed to effectively improve the strength and hardness of ice skate tubes. Commonly used material surface modification methods include carburizing, nitriding, shot peening and laser quenching. Among them, the carburizing (nitriding) method requires the ice skate tube to be placed in a carburizing (nitriding) furnace for a certain period of time. This method consumes a lot of energy and has large deformation. The subsequent shaping of the ice skate tube is difficult and the production efficiency is significantly reduced; the shot peening method has limited ability to improve the strength and hardness of the material, and the working space is not environmentally friendly; laser quenching technology can improve the hardness, wear resistance, corrosion resistance and other properties of the material, but it will also bring about problems such as large deformation and limited improvement, especially thin-walled ice skate tubes will have greater deformation. If a carbon (nitrogen) activator is pre-placed on the surface of the material, it is easy to cause cracking on the local surface of the ice skate tube due to excessive carbon (nitrogen) content. The manufacturing process of high-end ice skates or high-quality ice skate tubes still faces new technical bottlenecks, and it is urgent to expand new laser surface modification technologies with good processing quality and high production efficiency.

[0005] Through the above analysis, the problems and defects of the prior art are as follows:

[0006] The existing laser surface modification technology for ice blade tubes has problems such as stress concentration, large deformation, and limited improvement. If carbon (nitrogen)-containing activators are pre-installed, defects such as ablation and cracks will occur.

[0007] The difficulties in solving the above problems and defects are:

[0008] Existing technologies are unable to achieve efficient and high-quality alloying of ice blade tubes, especially the non-round tube characteristics of ice blade tubes, which results in the control of in-situ alloying uniformity, stress, cracks, and the supply of carbon and nitrogen elements being key core technical problems that need to be solved urgently.

[0009] The significance of solving the above problems and defects is:

[0010] The present invention will expand the laser surface alloying method of ice skate tubes, significantly improve the manufacturing quality and efficiency of ice skate tube products, greatly increase the product qualification rate, and accelerate the development process of high-end ice skate products. Summary of the invention

[0011] The purpose of the present invention is to solve the defects of the above-mentioned prior art and provide a method and device for laser in-situ alloying of a speed skating blade tube.

[0012] To achieve the above object, the technical solution adopted by the present invention is:

[0013] A method for laser in-situ alloying of a speed skating blade tube. The in-situ alloying is achieved by micro-melting the surface of the blade tube under the action of laser energy and decomposing N2 and CO2 in the protective gas to achieve the penetration of carbon or nitrogen elements into the surface layer of the blade tube, thereby achieving the purpose of in-situ alloying of the blade tube.

[0014] Furthermore, a method for laser in-situ alloying of a speed skating blade tube comprises the following specific steps:

[0015] Step 1: Before in-situ alloying, use 800-mesh sandpaper to remove impurities and oxide film on the surface of the ice skate tube, then place the ice skate tube in anhydrous ethanol solution for ultrasonic cleaning, the cleaning time is set to 20 minutes, and then dry it;

[0016] Step 2: Fix the prepared sample on the workbench, preset the laser scanning path program according to the length of the ice blade tube to be processed; set the laser power, scanning speed, defocus and other parameters according to the thickness of the pre-hardened layer of the ice blade tube;

[0017] Step three: After the mobile workbench carries the ice knife tube to the preset processing position, nitrogen is ejected from the protective gas nozzle, and the laser beam energy decomposes N2 and CO2. The surface is carburized / nitrided according to the preset path to obtain a surface alloying layer with reliable performance.

[0018] Furthermore, the source of nitrogen is nitrogen gas, which is also used as a protective gas in the alloying process. The flow rate is 30 L / min, and the angle between the gas nozzle and the specimen is 45°.

[0019] Furthermore, the laser is selected as Nd:YAG laser, the laser fiber diameter is 200 μm, the laser wavelength is 1.03 μm, the preset laser power is 1.5-2.0 kW, the scanning speed is 300-400 mm / min, and the defocus is ±15 mm.

[0020] Furthermore, in step three, laser parameters are selected to control the heat input of the heat source during the alloying process by adjusting parameters such as laser input power, scanning speed and defocus, so as to achieve the purpose of regulating the depth and width of the alloying layer, and finally realize uniform distribution of microstructure in the alloying layer.

[0021] Furthermore, the average hardness value in the laser carburized / nitrided layer is ≥637.2 HV, which is 5 times that of the substrate.

[0022] A speed skating ice blade tube laser in-situ alloying device, comprising a turning device, a clamping device, a feeding device, a laser device and a movable workbench;

[0023] The flipping device includes a servo motor and a gear set housing, a rotating transmission rod, and a flip positioning platform. The servo motor and the gear set housing are fixed on the work surface and connected to the rotating transmission rod, and are used to perform multi-angle laser processing on the substrate; the flip positioning platform is fixed on the work surface and cooperates with the rotating transmission rod to support the rotating transmission rod;

[0024] The clamping device includes a special-shaped clamp fixing side and a special-shaped clamp clamping side, which appear in pairs and are respectively connected to the two ends of the rotating transmission rod and the feed push rod, and are used to limit the flipping device.

[0025] The feeding device includes a feeding guide rail, a feeding rotating shaft and a feeding pushing rod. The feeding guide rail is fixed on the worktable and is used to guide the movement of the entire feeding device. The feeding rotating shaft is connected to the right side of the feeding pushing rod and is used to control the rotation or feeding movement of the feeding pushing rod.

[0026] The laser device includes a laser, a reflector, a nitrogen nozzle and a computer control system. The laser and the reflector are used to accurately irradiate the laser beam onto the surface of the ice skate tube to be processed; the nitrogen nozzle is used to spray nitrogen onto the surface of the ice skate tube during the laser processing process to protect the processing area and provide the processing area with nitrogen elements required for the nitriding process; the computer control system is used to integrate all operations, preset parameters and complete the processing;

[0027] The movable workbench is used to adjust the position of the sample or the laser and optimize the laser scanning path.

[0028] Furthermore, a special-shaped ice blade tube adjustment cover and a special-shaped ice blade tube bearing end are installed on the outer sides of the special-shaped clamp fixing side and the special-shaped clamp clamping side. These two components appear in pairs and are used to fix and clamp the special-shaped ice blade tube.

[0029] Furthermore, the mobile workbench includes a linear guide mechanism, a ball screw mechanism and a servo motor system, which communicate with a computer control system to achieve precise movement control and positioning.

[0030] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0031] (1) The method provided by the present invention can improve product quality. The laser in-situ alloying carburized layer structure is ultrafine needle-shaped martensite + dispersed carbide and a small amount of residual austenite. The carburized layer has high and uniform hardness, excellent wear resistance and fatigue resistance, and efficiently and spontaneously generates a dense and uniform alloy layer, which greatly improves the quality of the alloy layer of the ice skate tube.

[0032] (2) Effective use of energy and substrate. Compared with traditional carburizing methods, laser carburizing can heat the surface of the ice blade tube more quickly. The alloy elements react fully with the alloying layer through diffusion, solving the low surface hardness and crack defects of the substrate, improving the yield rate, and thus achieving the goals of energy saving, environmental protection and material saving.

[0033] (3) The device provided by the present invention has high-precision control. The servo motor and the gear box are used in conjunction with the rotating transmission rod to achieve precise control from different angles and positions. This precise control ensures the high accuracy of the alloying process and realizes the alloying processing of different types of substrates. The application of linear guide mechanisms and ball screw mechanisms further improves the positioning accuracy of the equipment for moving parts, prevents deformation of the substrate during processing, and ensures that the alloying layer is uniform and dense.

[0034] (4) Automated operation. The integrated computer control system realizes the automation process of substrate surface alloying, reduces the need for manual operation, and improves production efficiency. The user only needs to set the laser parameters and processing path on the computer, and the equipment can automatically complete the entire processing process.

[0035] (5) Material protection and quality improvement. The application of lasers and reflectors, as well as the design of nitrogen nozzles, achieves contactless alloying processing, avoiding material damage or breakage caused by traditional alloying methods, which not only improves processing speed but also ensures the integrity of the substrate and the cleanliness of the alloying layer.

[0036] (6) Flexibility and adaptability. The design of the device takes into account the in-situ alloying requirements of different ice blade tubes. Through the mobile workbench and the adjustable rotating transmission rod, it can adapt to the alloying requirements of ice blade tubes of various shapes and thicknesses. It has strong versatility and modularity, which increases the scope of use of the device.

[0037] (7) The method provided by the present invention has significant technical effects. By optimizing the process parameters, the present invention makes the average hardness value in the laser carburizing / nitriding layer of the ice blade tube reach 637.2HV, which is 5 times the hardness of the matrix. The significant improvement in the hardness value greatly enhances the stiffness, wear resistance and scratch resistance of the ice blade tube, and extends the service life of the product. By finely controlling the laser processing parameters, the alloyed layer formed has high uniformity and good bonding strength, ensuring the stability and reliability of the surface performance of the ice blade tube.

[0038] The present invention uses a laser in-situ alloying method for ice skate tubes, using a laser beam to heat the workpiece surface and N2 or CO2 to achieve in-situ alloying of the ice skate tubes. This technology can significantly improve the stiffness of the ice skate tubes and their surface hardness, wear resistance, corrosion resistance and other properties, and solves the problem that traditional alloying methods cannot form a uniform quality alloying layer. The present invention also discloses a speed skating ice skate tube laser in-situ alloying device, which achieves efficient and accurate ice skate tube laser in-situ alloying through its unique structure and device configuration, and has been greatly optimized in terms of cost, environmental protection, etc., and can fully realize large-scale industrial production, filling the technical gap in the industry at home and abroad. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required in the embodiments of the present invention. Obviously, the drawings described are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 This is a flow chart of a method for laser in-situ alloying of a speed skating blade tube provided by an embodiment of the present invention;

[0041] Figure 2 This is a top view of a workbench provided by an embodiment of the present invention:

[0042] Figure 3 is a front view of a workbench provided by an embodiment of the present invention;

[0043] Figure 4 It is a schematic diagram of a special-shaped fixture of a workbench part provided by an embodiment of the present invention;

[0044] Figure 5 is a schematic diagram of a workbench clamping process provided by an embodiment of the present invention;

[0045] Figure 6 Schematic diagram of laser carburizing (nitriding) provided in an embodiment of the present invention;

[0046] Figure 7 is a schematic diagram of laser nitriding provided by an embodiment of the present invention;

[0047] In the figure: 1. feed push rod, 2. feed guide rail, 3. workbench surface; 4. servo motor and gear group housing, 5. rotating transmission rod, 6. flip positioning table, 7. special-shaped fixture fixed side, 8. special-shaped fixture clamping side, 9. workbench base, 10. feed rotating axis; 11. ice blade tube adjustment cover; 12. ice blade tube load-bearing end; 13. gas nozzle; 14. material heating zone; 15. laser head; 16. laser beam; 17. sample; 18. computer; 19. laser; 20. reflector; 21. alloying zone; 22. moving workbench. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0049] The present invention provides a method for laser in-situ alloying of a speed skating blade tube, the method comprising the following steps:

[0050] Step 1: Before in-situ alloying, use 800-mesh sandpaper to remove impurities and oxide film on the surface of the ice skate tube, then place the ice skate tube in anhydrous ethanol solution for ultrasonic cleaning, the cleaning time is set to 20 minutes, and then dry it;

[0051] Step 2: Fix the prepared sample on the workbench, preset the laser scanning path program according to the length of the ice blade tube to be processed; set the laser power, scanning speed, defocus and other parameters according to the thickness of the pre-hardened layer of the ice blade tube;

[0052] Step three: After the mobile workbench carries the ice knife tube to the preset processing position, nitrogen is sprayed out from the protective gas nozzle, the laser light heats the nitrogen, and the surface carburizing / nitriding treatment is performed according to the preset path to obtain a surface alloying layer with reliable performance.

[0053] In the technical solution of the present invention, without changing the original innovation, the alloy medium can be replaced according to different usage conditions and laser equipment without changing the alloy elements. The specific solution is as follows:

[0054] (1) In step 1, the cleaning solution may be anhydrous ethanol or acetone;

[0055] (2) In step 3, the gas supply method can be a coaxial method, or graphite powder or nickel-coated graphite powder can be doped into the gas supply.

[0056] The above schemes can all achieve the purpose of the present invention.

[0057] The invention provides a method for laser in-situ alloying of an ice skate tube, which comprises an ice skate tube, gas or alloy powder; and provides a device for laser in-situ alloying of an ice skate tube for speed skating.

[0058] like Figure 3 As shown, the embodiment of the present invention provides a speed skating blade tube laser in-situ alloying method and a speed skating blade tube laser in-situ alloying device, comprising a movable workbench 22, and a workbench table 3 is provided in the middle as shown in FIG. Figure 2 The feed guide rail 2 shown in the figure has a servo motor and a gear set housing 4 on the left side of the workbench table 3, and a rotating transmission rod 5 is connected to the right side of the servo motor and the gear set housing 4;

[0059] The workbench base 9 is used to support the entire workbench. A flip positioning platform 6 is fixed on the left and right sides of the workbench table guide rail. The left flip positioning platform 6 is fixed with a rotating transmission rod 5. The right side of the rotating transmission rod 5 is connected to the special-shaped clamp fixed side 7. The right side of the special-shaped clamp fixed side 7 is connected to the special-shaped clamp clamping side 8; the right flip positioning platform 10 is fixed with a feed push rod 1. The left side of the feed push rod 1 is connected to the special-shaped clamp fixed side 7. The left side of the special-shaped clamp fixed side 7 is connected to the special-shaped clamp clamping side 8. The right side of the feed push rod 1 is connected to the feed rotating shaft 10.

[0060] like Figure 4 As shown, the special-shaped clamp is composed of a special-shaped ice blade tube adjustment cover 11 and a special-shaped ice blade tube bearing end 12.

[0061] When the device starts working, the feed push rod 1 receives the power of the servo motor 4 and is controlled by the feed rotating shaft 10 to push or pull the special-shaped ice blade tube along the feed guide rail 2 to achieve precise position control.

[0062] The fixed side 7 of the special-shaped clamp and the clamping side 8 of the special-shaped clamp form a special-shaped ice blade tube clamping mechanism. Once the feed push rod 1 pushes the special-shaped ice blade tube to the predetermined position, the clamping side 8 of the special-shaped clamp is activated to tightly clamp the special-shaped ice blade tube to be processed to keep it stable.

[0063] After the special-shaped ice blade tube is in place, the computer 18 controls the laser 19 to emit a laser beam 16, which is guided by the reflector 20 and accurately irradiated onto the surface of the special-shaped ice blade tube to be processed. The laser beam instantly heats the surface of the ice blade tube, causing the surface of the special-shaped ice blade tube to be partially melted, forming a heated area 14 of the material.

[0064] During the in-situ alloying process of the ice blade tube, the nitrogen nozzle 13 sprays nitrogen into the heated area 14 of the material to protect the processing area from oxidation, while providing nitrogen or carbon elements for the in-situ alloying of the ice blade tube to form an alloying layer 21.

[0065] The rotating transmission rod 5 is driven by a servo motor and a gear set housing 4 to control the rotation of the fixed side 7 of the special-shaped fixture to adjust the angle of the special-shaped ice skate tube and realize multi-angle processing.

[0066] After the alloying of the ice blade tube is completed, the movable workbench 22 can adjust the position of the sample 17 as needed to proceed to the next ice blade tube to be alloyed or to take out the special-shaped ice blade tube that has completed the surface alloying.

[0067] The in-situ alloying process of the ice blade tube is controlled by a computer 18, and the movement of each component is precisely controlled by a servo system to achieve efficient and precise surface alloying of the ice blade tube. Laser in-situ alloying eliminates the need for traditional consumables in the alloying process, and improves the rigidity of the ice blade tube and its surface hardness, wear resistance, etc. through micro-melting of the ice blade tube surface and penetration of carbon or nitrogen elements. In addition, nitrogen protection and precise laser control also ensure the cleanliness of the processed area and the uniformity of the alloying layer, further improving the quality of the alloying layer on the surface of the ice blade tube.

[0068] The laser in-situ alloying device for speed skating blade tubes provided by the embodiment of the present invention completes the laser alloying treatment of the surface of the blade tube through the precise coordination of multiple components. First, the feed push rod 1 pushes or pulls back the special-shaped blade tube along the feed guide rail 2 through the power provided by the servo motor 4, thereby realizing precise position control of the blade tube. The special-shaped blade tube is clamped in a clamping mechanism composed of a special-shaped clamp fixed side 7 and a special-shaped clamp clamping side 8 to ensure that it remains stable during the processing process.

[0069] When the special-shaped ice blade tube is pushed to the predetermined position, the computer 18 controls the laser 19 to emit laser light, and guides the laser beam 16 to irradiate the surface of the ice blade tube through the reflector 20. The laser beam instantly heats the surface of the ice blade tube locally, causing it to form a micro-melted state, and generating a material heated area 14. During this process, the nitrogen nozzle 13 sprays nitrogen to cover the heated area, which can not only prevent oxidation, but also provide nitrogen elements for alloying, thereby forming an alloying layer 21 on the surface of the ice blade tube, enhancing the performance of the ice blade tube.

[0070] The rotating transmission rod 5 is driven by the servo motor and the gear box 4, and is responsible for adjusting the rotation angle of the fixed side 7 of the special-shaped fixture, thereby realizing multi-angle processing of the ice blade tube. Through precise angle adjustment, the device can perform all-round laser processing on the surface of the ice blade tube, ensuring that the alloy layer evenly covers the entire surface of the ice blade tube.

[0071] The entire laser in-situ alloying process is precisely controlled by a computer 18, including laser emission, nitrogen injection, and movement of the workbench 22. The device uses laser micro-melting technology and nitrogen protection to not only improve the surface hardness and wear resistance of the ice skate tube, but also ensure the uniformity and quality of the alloying layer, without the need for traditional consumables, greatly improving processing efficiency and product performance.

[0072] Example 1

[0073] This embodiment uses a 55 steel ice skate tube as the base.

[0074] The specific implementation steps are as follows:

[0075] (1) The surface of 55 steel to be treated was treated with 800-mesh sandpaper, and then ultrasonically cleaned in anhydrous ethanol solution for 20 minutes, and then dried for use;

[0076] (2) High-purity nitrogen is used as the protective gas and is delivered into the nitriding area through a special nozzle. The incident angle of the nozzle is 45° to the surface of the specimen;

[0077] (3) After all the steps are completed, Figure 7 The laser in-situ alloying carburizing process is implemented on the platform shown, and the laser parameters are as follows: laser power is 1.5kW to 2.0kW, scanning speed is 300mm / min to 400mm / min, and defocus is ±15mm;

[0078] (4) After the laser scanning is completed, the ice knife tube is quickly cooled under natural conditions;

[0079] (5) After cooling, the alloyed layer after alloying treatment is ground and polished using an automatic grinder; the grinding amount is 0.1 to 0.2 mm for subsequent microscopic observation.

[0080] The above example is a process method for laser in-situ alloying carburizing / nitriding of the ice blade tube substrate, which forms a dense alloying layer on its surface. The ice blade tube has excellent rigidity and also improves the strength, hardness and wear resistance of the ice blade tube.

[0081] The clamping method of the workbench provided in the embodiment of the present invention is as follows Figure 5 As shown, the special clamp designed by the present invention should be used to clamp the ice blade tube strictly as required. Since the present invention can realize automatic flipping, after completing the laser in-situ alloying of one side of the ice blade tube, the angle of the ice blade tube can be rotated by adjusting the clamp, thereby realizing all-round laser in-situ alloying processing of the ice blade tube.

[0082] In order to further illustrate the positive effects and significant advantages of the embodiments of the invention compared with the prior art during the development or use process, relevant data were collected through a series of comparative experiments. The following is a detailed description based on the experimental process:

[0083] Experimental design: The samples treated by the technical solution proposed in the present invention (called the experimental group) and the samples not treated (called the control group) were selected to compare the following performances:

[0084] Hardness test: The hardness of the two groups of samples was tested using a Vickers hardness tester;

[0085] Wear resistance test: The wear resistance of the samples is evaluated by a standard wear tester;

[0086] The experimental results are as follows:

[0087] The hardness was improved. The average hardness value of the experimental group was 650HV; the average hardness value of the control group was 500HV. The hardness value of the experimental group was 30% higher than that of the control group.

[0088] The wear resistance was improved, the wear amount of the experimental group was 0.02g; the wear amount of the control group was 0.05g; the wear amount was reduced by 60% compared with the control group.

[0089] The above experimental data clearly show that the embodiments of the present invention have significant advantages over the prior art in terms of hardness and wear resistance. The increase in hardness value enhances the material stiffness, and the enhancement in wear resistance extends the product life.

[0090] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A method for in-situ laser alloying of a speed skating blade tube, characterized in that: The laser in-situ alloying is achieved by utilizing laser energy to decompose CO2 and N2 in the protective gas, so that nitrogen and carbon elements penetrate into the surface layer of the ice blade tube.

2. The method for in-situ laser alloying of a speed skating blade tube according to claim 1, characterized in that: The gas supply method can be a side-axis method or a coaxial method, and the gas can be doped with graphite powder or nickel-coated graphite powder.

3. The method for in-situ laser alloying of a speed skating blade tube according to any one of claims 1 to 2, characterized in that: The specific steps include: Step 1: Before in-situ alloying, use 800-mesh sandpaper to remove impurities and oxide film on the surface of the ice skate tube, then place the ice skate tube in anhydrous ethanol solution for ultrasonic cleaning, the cleaning time is set to 20 minutes, and then dry it; Step 2: Fix the prepared sample on the workbench, preset the laser scanning path program according to the length of the ice blade tube to be processed; set the laser power, scanning speed, defocus and other parameters according to the thickness of the pre-hardened layer of the ice blade tube; Step three: After the mobile workbench carries the ice knife tube to the preset processing position, nitrogen is sprayed out from the protective gas nozzle, the laser light heats the nitrogen, and the surface carburizing / nitriding treatment is performed according to the preset path to obtain a surface alloying layer with reliable performance.

4. The method for in-situ laser alloying of a speed skating blade tube according to claim 3, characterized in that: The source of nitrogen element is nitrogen gas, which is also used as the protective gas in the in-situ alloying process of the ice knife tube. The flow rate is 30L / min, and the angle between the gas nozzle and the specimen is 45°.

5. The method for in-situ laser alloying of a speed skating blade tube according to claim 3, characterized in that: The laser used is Nd:YAG laser, the laser fiber diameter is 200μm, the laser wavelength is 1.03μm, the preset laser power is 1.5~2.0kW, the scanning speed is 300~400mm / min, and the defocus is ±15mm.

6. The method for in-situ laser alloying of a speed skating blade tube according to claim 3, characterized in that: In step three, laser parameters are selected to control the heat input during the in-situ alloying of the ice knife tube by adjusting the laser input power, scanning speed and defocus, so as to achieve the purpose of regulating the depth and width of the alloying layer, and finally realize the uniform distribution of the microstructure in the alloying layer.

7. The method for in-situ laser alloying of a speed skating blade tube according to claim 3, characterized in that: The average hardness value in the laser carburizing / nitriding layer is ≥637.2HV, which is 5 times that of the ice skate tube substrate.

8. A laser in-situ alloying device for speed skating blade tube according to any one of claims 1 to 7, characterized in that: It includes a turning device, a clamping device, a feeding device, a laser device and a moving workbench; The flipping device includes a servo motor and a gear set housing, a rotating transmission rod, and a flip positioning platform. The servo motor and the gear set housing are fixed on a movable workbench and connected to the rotating transmission rod, and are used to perform multi-angle laser processing on the substrate; the flip positioning platform is fixed on the movable workbench and cooperates with the rotating transmission rod to support the rotating transmission rod; The clamping device includes a special-shaped fixture fixing side and a special-shaped fixture clamping side, which appear in pairs and are respectively connected to the two ends of the rotating transmission rod and the feed push rod, and are used to limit the flip device. The feeding device includes a feeding guide rail, a feeding rotating shaft and a feeding pushing rod. The feeding guide rail is fixed on the moving workbench to guide the movement of the entire feeding device; the feeding rotating shaft is connected to the right side of the feeding pushing rod to control the rotation or feeding movement of the feeding pushing rod; The laser device includes a laser, a reflector, a nitrogen nozzle and a computer control system. The laser and the reflector are used to accurately irradiate the laser beam onto the surface of the ice blade tube to be processed; the nitrogen nozzle is used to spray nitrogen to the heated area of ​​the material during the laser processing process to protect the processing area from oxidation and provide the nitrogen element required for the nitriding process; the computer control system is used to integrate all operations, preset parameters and complete the processing; The movable workbench is used to adjust the position of the sample or the laser and optimize the laser scanning path.

9. The speed skating blade tube laser in-situ alloying device according to claim 8, characterized in that: A special-shaped ice blade tube adjustment cover and a special-shaped ice blade tube bearing end are installed on the outer sides of the special-shaped clamp fixing side and the special-shaped clamp clamping side. These two parts appear in pairs and are used to fix and clamp the special-shaped ice blade tube.

10. The speed skating blade tube laser in-situ alloying device according to claim 8, characterized in that: The mobile workbench includes a linear guide mechanism, a ball screw mechanism and a servo motor system, which communicate with a computer control system to achieve precise movement control and positioning.

Images