A Method for Texturing the Surface to be Bonded of the Diffusion Section Shell of an Alloy Structural Steel

Abstract

The present invention discloses a method for texturing the surface to be glued of an alloy structural steel diffusion section housing, specifically relating to the technical field of alloy structural steel surface treatment. Through the control of specific laser parameters, the present invention conducts texturing treatment three times respectively. In the first texturing treatment, shallower and narrower spiral texturing pits are obtained. Then, a molten material containing alloy micropowder is sprayed inside the texturing pits, and high-temperature heat treatment is carried out to form ultrafine grains. And the second texturing treatment is carried out on the surface of the molten material to form several texturing pits and edge protrusions. In the third texturing treatment, spiral texturing pits that are deeper and wider and have the opposite direction to the first and second times are formed, greatly improving the roughness of the surface to be glued, and also greatly enhancing the bonding strength. Moreover, the addition of the molten material ensures the strength of the diffusion section housing, improving the anti-destruction ability as well.

Description

Technical Field

[0001] The present invention relates to the technical field of surface treatment of alloy structural steel, and more specifically, the present invention relates to a method for texturing the surface to be bonded of a diffusion section housing of alloy structural steel. Background Art

[0002] Currently, the connection of the diffusion section housing of alloy structural steel is generally carried out by texturing the surface to be bonded and then performing bonding treatment. Using texturing technology for connection can not only give full play to the overall performance of the composite material, avoid the stress concentration problem caused by opening holes, but also transfer a large load. Therefore, texturing technology is widely used in the bonding field.

[0003] In the prior art, the most commonly used texturing methods are sandblasting treatment and laser texturing treatment. The surface roughness of the diffusion section housing after sandblasting treatment is uneven, and the surface morphology and microstructure of the material cannot be quantitatively controlled, resulting in poor reliability and stability of the bonding strength of the diffusion section components, and further making the quality reliability of the product unable to be effectively guaranteed. During the laser texturing treatment process, generally only the texturing degree is adjusted by simply adjusting different laser parameters. Not only are the parameter settings difficult to cooperate well, but the hardness decreases after treatment, resulting in an overall reduction in the anti-destruction ability, and the bonding strength after texturing cannot be well guaranteed either.

[0004] Therefore, aiming at the problems existing in laser texturing in the prior art, if the deficiencies of the existing laser texturing methods can be avoided, and the treatment effect, hardness after treatment, and bonding strength after treatment of laser texturing can be improved, it is of great significance for promoting the application of laser texturing technology. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a method for texturing the surface to be bonded of a diffusion section housing of alloy structural steel. The technical problem to be solved by the present invention is: the surface roughness of the diffusion section housing after sandblasting treatment is uneven, making the quality reliability of the product unable to be effectively guaranteed, and during the laser texturing treatment process, not only are the parameter settings difficult to cooperate well, but the hardness decreases after treatment, resulting in an overall reduction in the anti-destruction ability, and the bonding strength after texturing cannot be well guaranteed either.

[0006] To achieve the above object, the present invention provides the following technical solution: A method for texturing the surface to be bonded of a diffusion section housing of alloy structural steel, comprising the following steps:

[0007] S1. First texturing treatment

[0008] S11. Fix the diffusion section housing of alloy structural steel using a fixed fixture, adjust the laser head, and set the parameters of the laser head so that the surface to be bonded is located on the focal plane of the laser spot.

[0009] S12. Then, control the fixed fixture to drive the diffusion section housing of alloy structural steel to rotate, and at the same time, control the laser to move horizontally along the axis of the diffusion section housing of alloy structural steel.

[0010] S13. Make the laser pulses emitted by the laser head form shallower and narrower spiral textured pits on the surface of the housing to be adhesively bonded. At this time, the first texturing treatment is completed.

[0011] Among them, the parameters of the laser head are as follows: output power 2 - 4 KW, optical pulse power 40 - 46 W, spot size 35 - 45 μm, pitch 80 - 120 μm, laser repetition frequency 38 - 60 kHz, optical pulse width 3 - 5 μs, random rate 58 - 72%, distribution density 45 - 55 dots per square millimeter.

[0012] S2. Second texturing treatment

[0013] S21. Fix the diffusion section housing of alloy structural steel with a fixed fixture, and spray a layer of molten material containing alloy micropowders on the surface of the spiral textured pits formed after the first texturing treatment with pulsed laser.

[0014] S22. Then, perform high-temperature heating treatment on the molten material. Under the action of the pulsed laser beam, it fuses with the surface of the diffusion section housing of alloy structural steel and forms convex bumps after cooling.

[0015] S23. Once again, perform the second texturing treatment on the surface of the formed convex bumps through the above steps, so that textured pits are formed inside the convex bumps and protrusions are formed at the edges of the convex bumps.

[0016] S3. Third texturing treatment

[0017] S31. Fix the diffusion section housing of alloy structural steel after the second texturing again, and readjust the starting position of the laser head so that the focal plane of the laser spot of the laser head is located at the center position of the leftmost thread line of the spiral textured pits, and use it as the starting position A for the third texturing treatment.

[0018] S32. Control the fixed fixture to drive the diffusion section housing of alloy structural steel to rotate again, in the opposite direction, and at the same time, control the laser to move horizontally along the axis of the diffusion section housing of alloy structural steel, so that the laser pulses emitted by the laser head can form deeper and wider spiral textured pits on the surface of the housing to be adhesively bonded. At this time, the third texturing treatment is completed.

[0019] Among them, the parameters of the laser head are as follows: the output power is 5 - 7 KW, the optical pulse power is 30 - 40 W, the spot size is 45 - 80 μm, the dot pitch is 120 - 170 μm, the laser repetition frequency is 60 - 70 kHz, the optical pulse width is 5 - 9 μs, the random rate is 72 - 80%, and the distribution density is 55 - 70 dots per square millimeter.

[0020] As a further solution of the present invention: the rotation speed of the fixed fixture driving the alloy structural steel diffusion section housing to rotate is two circles per minute, and the moving speed of the laser along the horizontal direction of the axis of the alloy structural steel diffusion section housing is 2 - 3 cm / min.

[0021] As a further solution of the present invention: the spraying thickness of the alloy micro - powder melting material is 0.1 - 0.3 mm, and the particle size of the alloy micro - powder in the alloy micro - powder melting material is 9 - 12 μm.

[0022] As a further solution of the present invention: the laser is one of a gas laser, a stacked laser, a picosecond laser, a femtosecond laser, a solid laser or an optical fiber laser.

[0023] As a further solution of the present invention: the distance between the textured surface and the laser emission position remains unchanged, and the scanning speed of the laser texturing head on the surface of the substrate is constant.

[0024] As a further solution of the present invention: before fixing the alloy structural steel diffusion section housing, it is necessary to use an ultrasonic cleaning device to clean its surface, and then after ultrasonic cleaning, wipe it clean with a cotton ball soaked in anhydrous ethanol to remove surface impurities, and dry it in a ventilated place.

[0025] As a further solution of the present invention: the coverage area of the laser - textured area is greater than 68% of the surface to be bonded of the alloy structural steel diffusion section housing, and the coverage area of the laser - textured area is less than 83% of the surface to be bonded of the alloy structural steel diffusion section housing.

[0026] As a further solution of the present invention: the alloy micro - powder melting material includes, but is not limited to, one or a mixture of high - purity metallic red copper powder, metallic yttrium powder, stainless steel alloy powder, iron - based alloy powder, chromium metal powder, titanium carbide powder, etc.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1. The present invention conducts three times of texturing treatments respectively under the control of specific laser parameters. In the first texturing treatment, shallower and narrower spiral texturing pits are obtained. Then, a molten material containing alloy micropowder is sprayed inside the texturing pits and subjected to high-temperature heating treatment to form ultrafine grains, thereby increasing the overall strength and wear resistance to a certain extent. And the second texturing treatment is carried out on the surface of the molten material, thus forming several texturing pits and edge protrusions on the surface to be bonded. In the third texturing treatment, the rotation direction of laser texturing is changed to form spiral texturing pits that are deeper and wider and opposite to the directions of the first and second times, greatly increasing the roughness of the surface to be bonded and also well improving the bonding strength. Moreover, the addition of the molten material ensures the strength of the diffusion section housing, and the anti-destruction ability is also improved;

[0029] 2. Before fixing the alloy structural steel diffusion section housing, the present invention uses an ultrasonic cleaning device to clean its surface, and then after ultrasonic cleaning, it is wiped clean with a cotton ball soaked in anhydrous ethanol, thereby well removing the impurities on the surface of the alloy structural steel diffusion section housing and avoiding the adverse effects caused by excessive surface impurities on the subsequent laser texturing treatment. Brief Description of the Drawings

[0030] Figure 1 It is a three-dimensional structural schematic diagram of the position of the surface to be bonded of the alloy structural steel diffusion section housing after the first texturing treatment of the present invention;

[0031] In the figure: A is the starting position of the third texturing treatment. Detailed Embodiment

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment 1:

[0033] A texturing method for the surface to be bonded of an alloy structural steel diffusion section housing, comprising the following steps:

[0034] S1. The first texturing treatment

[0035] S11. Fix the alloy structural steel diffusion section housing with a fixing jig, adjust the laser head, and set the parameters of the laser head so that the surface to be bonded is located on the focal plane of the laser spot.

[0036] S12. Then, control the fixed fixture to drive the diffusion section housing of alloy structural steel to rotate, and at the same time, control the laser to move horizontally along the axis of the diffusion section housing of alloy structural steel.

[0037] S13. Make the laser pulses emitted by the laser head form shallower and narrower spiral textured pits on the surface of the housing to be adhesively bonded. At this time, the first texturing treatment is completed.

[0038] Among them, the parameters of the laser head are: output power 2KW, optical pulse power 40W, spot size 35μm, dot pitch 80μm, laser repetition frequency 38kHz, optical pulse width 3μs, random rate 58%, and distribution density 45 points per square millimeter.

[0039] S2. Second texturing treatment

[0040] S21. Fix the diffusion section housing of alloy structural steel with a fixed fixture, and spray a layer of molten material containing alloy micropowders on the surface of the spiral textured pits formed after the first texturing treatment by pulsed laser.

[0041] S22. Then, perform high-temperature heat treatment on the molten material. Under the action of the pulsed laser beam, it fuses with the surface of the diffusion section housing of alloy structural steel and forms convex bumps after cooling.

[0042] S23. Once again, perform the second texturing treatment on the surface of the formed convex bumps through the above steps, so that textured pits are formed inside the convex bumps and protrusions are formed at the edges of the convex bumps.

[0043] S3. Third texturing treatment

[0044] S31. Fix the diffusion section housing of alloy structural steel after the second texturing treatment again, and readjust the starting position of the laser head so that the focal plane of the laser spot of the laser head is located at the center position of the leftmost thread of the spiral textured pits, as shown in the figure, and use it as the starting position A for the third texturing treatment.

[0045] S32. Control the fixed fixture to drive the diffusion section housing of alloy structural steel to rotate again, in the opposite direction, and at the same time, control the laser to move horizontally along the axis of the diffusion section housing of alloy structural steel, so that the laser pulses emitted by the laser head can form deeper and wider spiral textured pits on the surface of the housing to be adhesively bonded. At this time, the third texturing treatment is completed.

[0046] Among them, the parameters of the laser head are: output power 5KW, optical pulse power 30W, spot size 45μm, dot pitch 120μm, laser repetition frequency 60kHz, optical pulse width 5μs, random rate 72%, and distribution density 55 points per square millimeter.

[0047] The rotation speed of the fixed fixture driving the diffusion section housing of alloy structural steel is two revolutions per minute, and the moving speed of the laser along the horizontal direction of the axis of the diffusion section housing of alloy structural steel is 2 cm / min.

[0048] The spraying thickness of the alloy powder molten material is 0.1 mm, the particle size of the alloy powder in the alloy powder molten material is 9 μm, and the alloy powder molten material is pure metal red copper powder.

[0049] The laser is a solid-state laser.

[0050] The distance between the textured surface and the laser emission position remains unchanged, and the scanning speed of the laser texturing head on the surface of the substrate is constant.

[0051] Before fixing the diffusion section housing of alloy structural steel, it is necessary to use an ultrasonic cleaning device to clean its surface, and then after ultrasonic cleaning, wipe it clean with a cotton ball soaked in anhydrous ethanol to remove surface impurities, and dry it in a ventilated place.

[0052] The coverage area of the laser-textured area is 68% of the surface to be bonded of the diffusion section housing of alloy structural steel. Example 2:

[0053] A method for texturing the surface to be bonded of a diffusion section housing of alloy structural steel, comprising the following steps:

[0054] S1. First texturing treatment

[0055] S11. Fix the diffusion section housing of alloy structural steel using a fixed fixture, adjust the laser head, and set the parameters of the laser head so that the surface to be bonded is located on the focal plane of the laser spot.

[0056] S12. Then control the fixed fixture to drive the diffusion section housing of alloy structural steel to rotate, and at the same time control the laser to move along the horizontal direction of the axis of the diffusion section housing of alloy structural steel.

[0057] S13. Make the laser head emit laser pulses to form relatively shallow and narrow spiral textured pits on the surface to be bonded of the housing, and at this time the first texturing treatment is completed.

[0058] Among them, the parameters of the laser head are: output power 3 KW, optical pulse power 43 W, spot size 40 μm, dot pitch 100 μm, laser repetition frequency 50 kHz, optical pulse width 4 μs, random rate 60%, and distribution density 50 points per square millimeter.

[0059] S2. Second texturing treatment

[0060] S21. Fix the alloy structural steel diffusion section housing with a fixed fixture, and spray a layer of molten material containing alloy micropowders on the surface of the spiral textured pits formed after the first texturing treatment using pulsed laser.

[0061] S22. Then perform a high-temperature heating treatment on the molten material. Under the action of the pulsed laser beam, it fuses with the surface of the alloy structural steel diffusion section housing and forms convex bumps after cooling.

[0062] S23. Perform a second texturing treatment on the surface of the formed convex bumps again through the above steps, so that textured pits are formed inside the convex bumps and protrusions are formed at the edges of the convex bumps.

[0063] S3. Third texturing treatment

[0064] S31. Fix the alloy structural steel diffusion section housing after the second texturing again, and adjust the starting position of the laser head again so that the focal plane of the laser spot of the laser head is located at the center position of the leftmost thread of the spiral textured pits, as shown in the figure, and use it as the starting position A for the third texturing treatment.

[0065] S32. Control the fixed fixture to drive the alloy structural steel diffusion section housing to rotate again in the opposite direction, and at the same time control the laser to move horizontally along the axis of the alloy structural steel diffusion section housing, so that the laser pulses emitted by the laser head can form deeper and wider spiral textured pits on the surface of the housing to be glued. At this time, the third texturing treatment is completed.

[0066] Among them, the parameters of the laser head are: output power is 6KW, optical pulse power is 35W, spot size is 60μm, dot pitch is 150μm, laser repetition frequency is 65kHz, optical pulse width is 8μs, random rate is 76%, and distribution density is 60 dots per square millimeter.

[0067] The rotation speed of the fixed fixture driving the alloy structural steel diffusion section housing to rotate is two revolutions per minute, and the moving speed of the laser along the horizontal direction of the axis of the alloy structural steel diffusion section housing is 3 cm / min.

[0068] The spraying thickness of the alloy micropowder molten material is 0.2 mm, the particle size of the alloy micropowders in the alloy micropowder molten material is 11μm, and the alloy micropowder molten material is stainless steel alloy powder.

[0069] The laser is a gas laser.

[0070] The distance between the textured surface and the laser emission position remains unchanged, and the scanning speed of the laser texturing head on the surface of the substrate is constant.

[0071] Before fixing the diffusion section housing of alloy structural steel, it is necessary to use an ultrasonic cleaning device to clean its surface, and then after ultrasonic cleaning, wipe it clean with a cotton ball soaked in anhydrous ethanol to remove surface impurities, and dry it in a ventilated place.

[0072] The coverage area of the laser texturing region is 72% of the surface to be bonded of the diffusion section housing of alloy structural steel. Example 3:

[0073] A method for texturing the surface to be bonded of a diffusion section housing of alloy structural steel includes the following steps:

[0074] S1. First texturing treatment

[0075] S11. Fix the diffusion section housing of alloy structural steel using a fixing jig, adjust the laser head, and set the parameters of the laser head so that the surface to be bonded is located on the focal plane of the laser spot.

[0076] S12. Then control the fixing jig to drive the diffusion section housing of alloy structural steel to rotate, and at the same time control the laser to move horizontally along the axis of the diffusion section housing of alloy structural steel.

[0077] S13. Make the laser pulses emitted by the laser head form relatively shallow and narrow spiral texturing pits on the surface to be bonded of the housing, and at this time the first texturing treatment is completed.

[0078] Among them, the parameters of the laser head are: output power 4KW, optical pulse power 46W, spot size 45μm, dot pitch 120μm, laser repetition frequency 60kHz, optical pulse width 5μs, random rate 72%, and distribution density 55 points per square millimeter.

[0079] S2. Second texturing treatment

[0080] S21. Fix the diffusion section housing of alloy structural steel using a fixing jig, and spray a layer of molten material containing alloy micropowders on the surface of the spiral texturing pits formed after the first texturing treatment with pulsed laser.

[0081] S22. Then perform high-temperature heating treatment on the molten material, and under the action of the pulsed laser beam, fuse it with the surface of the diffusion section housing of alloy structural steel, and form convex bumps after cooling.

[0082] S23. Again perform the second texturing treatment on the surface of the formed convex bumps through the above steps, so that texturing pits are formed inside the convex bumps and protrusions are formed at the edges of the convex bumps.

[0083] S3. Third texturing treatment

[0084] S31. Fix the alloy structural steel diffusion section housing after the second texturing again, and readjust the starting position of the laser head so that the focal plane of the laser spot of the laser head is located at the center position of the leftmost thread of the spiral textured pit, as shown in the figure, and use it as the starting position A for the third texturing process.

[0085] S32. Control the fixed fixture to drive the alloy structural steel diffusion section housing to rotate again in the opposite direction. At the same time, control the laser to move horizontally along the axis of the alloy structural steel diffusion section housing so that the laser pulses emitted by the laser head can form deeper and wider spiral textured pits on the surface of the housing to be bonded. At this time, the third texturing process is completed.

[0086] Among them, the parameters of the laser head are: output power is 7KW, optical pulse power is 40W, spot size is 80μm, dot pitch is 170μm, laser repetition frequency is 70kHz, optical pulse width is 9μs, random rate is 80%, and distribution density is 70 dots per square millimeter.

[0087] The rotation speed of the fixed fixture driving the alloy structural steel diffusion section housing to rotate is two turns per minute, and the moving speed of the laser along the horizontal direction of the axis of the alloy structural steel diffusion section housing is 3 cm / min.

[0088] The spraying thickness of the alloy micro-powder melting material is 0.3 mm, the particle size of the alloy micro-powder in the alloy micro-powder melting material is 12μm, and the alloy micro-powder melting material is a mixture of iron-based alloy powder, chromium metal powder and titanium carbide powder.

[0089] The laser is a gas laser.

[0090] The distance between the textured surface and the laser emission position remains unchanged, and the scanning speed of the laser texturing head on the surface of the substrate is constant.

[0091] Before fixing the alloy structural steel diffusion section housing, it is necessary to use an ultrasonic cleaning device to clean its surface, and then wipe it clean with a cotton ball soaked in anhydrous ethanol after ultrasonic cleaning to remove surface impurities, and dry it in a ventilated place.

[0092] The coverage area of the laser textured area is 83% of the surface of the alloy structural steel diffusion section housing to be bonded.

[0093] Comparative Example 1:

[0094] Use the common laser texturing method in the prior art to texture the surface of the alloy structural steel diffusion section housing to be bonded.

[0095] Measure the surface roughness, texturing morphology, surface hardness and tensile shear strength of the textured diffusion sections obtained in each example and comparative example.

[0096] The measurement method is as follows:

[0097] 1. The test methods for surface roughness and texturing morphology are as follows:

[0098] Put it into an ultrasonic cleaning instrument, take it out and dry it after cleaning, and evenly select eight sampling points on the surface to be bonded of the alloy structural steel diffusion section shell. Use a WYKO-NT1100 type surface three-dimensional morphology analyzer to detect the morphology size of the area without texturing treatment and the textured area. Among them, the eight sampling points are evenly distributed along the circumferential direction of the alloy structural steel diffusion section shell, and measure its surface roughness Ra according to the results. The final result is the average value.

[0099] 2. The test method for the surface hardness of the textured area is as follows:

[0100] Use a microhardness tester to detect the hardness of the area without texturing treatment and the textured area respectively, and evenly select eight sampling points at each detection position. The final result is the average value.

[0101] 3. Tensile shear strength test method:

[0102] Use E-7 glue to bond the laser-textured alloy structural steel diffusion section shell. After bonding, let it stand and cure for 24h, and then conduct a shear tensile test on the bonded standard specimen to test the tensile shear strength of the bonded standard specimen. The result is the average value.

[0103] According to Examples 1-3 and Comparative Example 1, the following table is obtained:

[0104] Surface roughness Ra Surface hardness HB Tensile shear strength MPa Texturing morphology Example 1 3.26μm 362 23 Better Example 2 3.56μm 410 28 Better Example 3 4.63μm 454 32 Better Comparative example 1 2.58μm 236 12 Worse

[0105] It can be seen from the comparison in the above table that according to the test results of surface roughness, surface hardness and tensile shear strength of Examples 1-3 and Comparative Example 1, the methods of Examples 1-3 have good localization, uniform texturing effect, good controllability of the morphology within the textured area, relatively high surface roughness, the surface hardness reaches 454, and the tensile shear strength reaches up to 32 at most. While in Comparative Example 1, the texturing effect is not uniform enough and the localization is poor, resulting in poor controllability of texturing, relatively low surface roughness, relatively low surface hardness, and the tensile shear strength is not ideal enough.

[0106] Under the control of specific laser parameters, the present invention performs three texturing treatments respectively. In the first texturing treatment, shallower and narrower spiral texturing pits are obtained. Then, a molten material containing alloy micropowders is sprayed inside the texturing pits and high-temperature heat treatment is carried out to form ultrafine grains, thereby increasing the overall strength and wear resistance to a certain extent. And the second texturing treatment is carried out on the surface of the molten material, thereby forming several texturing pits and edge protrusions on the surface to be bonded. In the third texturing treatment, the rotation direction of laser texturing is changed to form spiral texturing pits that are deeper and wider and opposite to the first and second directions, greatly increasing the roughness of the surface to be bonded and also well improving the bonding strength. Moreover, the addition of the molten material ensures the strength of the diffuser section housing, improving the anti-destruction ability as well. Before fixing the alloy structural steel diffuser section housing, the present invention uses an ultrasonic cleaning device to clean its surface, and then after ultrasonic cleaning, it is wiped clean with a cotton ball soaked in absolute ethanol, thereby well removing the impurities on the surface of the alloy structural steel diffuser section housing and avoiding the adverse effects caused by excessive surface impurities on the subsequent laser texturing treatment.

[0107] Finally, several points should be noted: Although the present invention has been described in detail with general descriptions and specific embodiments above, on the basis of the present invention, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for texturing the bonding surface of an alloy structural steel diffusion section housing, characterized in that, it comprises the following steps: S1. First texturing treatment S11. Fix the alloy structural steel diffusion section housing using a fixing jig, adjust the laser head, and set the parameters of the laser head so that the surface to be bonded is located on the focal plane of the laser spot; S12. Then control the fixing jig to drive the alloy structural steel diffusion section housing to rotate, and at the same time control the laser to move horizontally along the axis of the alloy structural steel diffusion section housing; S13. Make the laser pulses emitted by the laser head form shallower and narrower spiral texturing pits on the surface of the housing to be bonded, and at this time the first texturing treatment is completed; S2. Second texturing treatment S21. Fix the alloy structural steel diffusion section housing using a fixing jig, and spray a layer of molten material containing alloy micropowder on the surface of the spiral texturing pits formed after the first texturing treatment using pulsed laser; S22. Then perform high-temperature heating treatment on the molten material, and under the action of the pulsed laser beam, fuse it with the surface of the alloy structural steel diffusion section housing, and form convex bumps after cooling; S23. Once again perform the second texturing treatment on the surface of the formed convex bumps through the above steps, so that texturing pits are formed inside the convex bumps and protrusions are formed at the edges of the convex bumps; S3. Third texturing treatment S31. Fix the alloy structural steel diffusion section housing after the second texturing again, and readjust the starting position of the laser head so that the focal plane of the laser spot of the laser head is located at the central position between the leftmost thread of the spiral texturing pits and its adjacent spiral, and use it as the starting position A for the third texturing treatment; S32. Control the fixing jig to drive the alloy structural steel diffusion section housing to rotate again, in the opposite direction of rotation, and at the same time control the laser to move horizontally along the axis of the alloy structural steel diffusion section housing, so that the laser pulses emitted by the laser head can form deeper and wider spiral texturing pits on the surface of the housing to be bonded, and at this time the third texturing treatment is completed.

2. A method for texturing the bonding surface of an alloy structural steel diffusion section housing according to claim 1, characterized in that: The rotation speed of the fixing jig driving the alloy structural steel diffusion section housing to rotate is two revolutions per minute, and the moving speed of the laser along the horizontal direction of the axis of the alloy structural steel diffusion section housing is 2 - 3 cm / min.

3. A method for texturing the bonding surface of an alloy structural steel diffusion section housing according to claim 1, characterized in that: The spraying thickness of the molten material is 0.1 - 0.3 mm, and the particle size of the alloy micropowder in the molten material is 9 - 12 μm.

4. A method for texturing the bonding surface of an alloy structural steel diffusion section housing according to claim 1, characterized in that: The laser is one of a gas laser or a solid laser.

5. A method for texturing the bonding surface of an alloy structural steel diffusion section housing according to claim 1, characterized in that: The distance between the texturing surface and the laser emission position remains unchanged, and the scanning speed of the laser texturing head on the surface of the substrate is constant.

6. A method for texturing the surface to be adhesively bonded of an alloy structural steel diffusion section housing according to claim 1, characterized in that: Before fixing the alloy structural steel diffusion section housing, it is necessary to clean its surface using an ultrasonic cleaning device, and then wipe the alloy structural steel diffusion section housing after ultrasonic cleaning with a cotton ball soaked in anhydrous ethanol to remove surface impurities, and dry it in a ventilated place.

7. A method for texturing the surface to be adhesively bonded of an alloy structural steel diffusion section housing according to claim 1, characterized in that: The coverage area of the laser texturing region is greater than 68% of the surface to be adhesively bonded of the alloy structural steel diffusion section housing, and the coverage area of the laser texturing region is less than 83% of the surface to be adhesively bonded of the alloy structural steel diffusion section housing.

8. A method for texturing the surface to be adhesively bonded of an alloy structural steel diffusion section housing according to claim 3, characterized in that: The molten material includes one or a mixture of more of high-purity metallic copper powder, metallic yttrium powder, iron-based alloy powder, chromium metal powder, and titanium carbide powder.

9. A method for texturing the surface to be adhesively bonded of an alloy structural steel diffusion section housing according to claim 1, characterized in that: During the first and second texturing processes, the parameters of the laser head are: output power 2 - 4 KW, optical pulse power 40 - 46 W, spot size 35 - 45 μm, dot pitch 80 - 120 μm, laser repetition frequency 38 - 60 kHz, optical pulse width 3 - 5 μs, random rate 58 - 72%, and distribution density 45 - 55 points per square millimeter.

10. A method for texturing the surface to be adhesively bonded of an alloy structural steel diffusion section housing according to claim 1, characterized in that: During the third texturing process, the parameters of the laser head are: output power 5 - 7 KW, optical pulse power 30 - 40 W, spot size 45 - 80 μm, dot pitch 120 - 170 μm, laser repetition frequency 60 - 70 kHz, optical pulse width 5 - 9 μs, random rate 72 - 80%, and distribution density 55 - 70 points per square millimeter.

Images