Method for producing punctiform coarse particle matte SDH surface stainless steel band by using laser texturing machine

Abstract

The invention relates to a manufacturing method of a stainless steel band, in particular to a method for producing a dotted coarse particle matte SDH surface stainless steel band by using a laser texturing machine. The point-shaped coarse particle matte SDH surface stainless steel band can be obtained through material selection, primary rolling, cleaning, solution treatment, secondary rolling, cleaning and withdrawal and straightening. The punctiform coarse particle matte SDH surface stainless steel band produced by the method is free of filamentous through visual inspection, punctiform and free of dragging under a 40X microscope, fine and smooth in surface, and 100-220GU in glossiness in the Y-axis direction, and is relatively high in input-output rate, good in stability and easy to control in the production process.

Description

Technical Field

[0001] The invention relates to a method for manufacturing a stainless steel belt, in particular to a method for producing a stainless steel belt with dot-shaped coarse particles and matte SDH surface by using a laser texturing machine. Background Art

[0002] The stainless steel belt with dot-shaped coarse grains and matte SDH surface is a stainless steel belt with a dot-shaped surface under a 40X light source microscope and visually coarse grains that are dull and matte. This is a stainless steel belt with a special surface shape.

[0003] At present, there are two kinds of stainless steel strips with special surface shapes produced in the industry, one is the ordinary stainless steel strip with a wire-shaped grinding pattern surface, and the other is the conventional stainless steel strip with a low gloss on the dot-shaped surface. For the ordinary stainless steel strip with a wire-shaped grinding pattern surface, the processing process generally finely grinds the working roller to control the surface roughness of the working roller to Ra0.3-0.4um, and the gloss is relatively high, basically exceeding 350GU, but the original grinding marks always exist, especially under a 40X microscope, there are obvious signs of dragging, which can never be overcome. For the conventional stainless steel strip with a low gloss on the dot-shaped surface, the dot-shaped surface is produced by sandblasting or shot blasting. The surface roughness Ra of the working roller treated by sandblasting or shot blasting is basically above 0.6um, and the gloss cannot meet customer needs. Moreover, the randomness of the sandblasting or shot blasting process is very large, and the uniformity is poor. It is difficult to make the head, middle and tail of different rolls of steel strips or the same roll of steel strips consistent, and it is impossible to accurately control. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and provide a method for producing a stainless steel belt with a dot-shaped coarse-grained matte SDH surface by using a laser texturing machine. The stainless steel belt with a dot-shaped coarse-grained matte SDH surface produced by the method is not only free of filaments when visually observed, but also dot-shaped and drag-free under a 40X microscope, with a fine surface and a glossiness of 100-220GU in the Y-axis direction, but also has a relatively high input-output ratio, good stability, and easy control of the production process.

[0005] To solve the above problems, the following technical solutions are adopted: The method of producing a stainless steel strip with a dot-shaped coarse grain matte SDH surface by using a laser texturing machine of the present invention is characterized by comprising the following steps: The first step is material selection. Select Zhangpu's SUS304 cold-rolled stainless steel billet with a thickness of more than 0.5 mm for use.

[0006] The second step is one-time rolling. The raw material thickness selected according to the finished product performance requirements is rolled in 3-4 passes. The last pass is rolled using SDH rough shot blasting roller Ra0.6-1.0um working roller, directly rolling to the semi-finished product thickness of 0.22+ / -0.01mm. At this time, the surface glossiness of the steel strip is low, only 100-160GU, and it is dot-shaped under a 40X microscope with light source.

[0007] The third step is cleaning. The rolled semi-finished product is removed from the surface of the steel strip at a speed of 80-100m / min on the degreasing cleaning unit to prepare for the solution treatment.

[0008] The fourth step is solution treatment. The semi-finished steel strip that has been cleaned once passes through a bright annealing furnace at a temperature of 1100-1140°C at a speed of 9-13m / min.

[0009] The fifth step is secondary rolling. For the first rolling, the SDH surface working roll produced by the laser texturing machine is directly used for rolling. The surface after rolling is a point surface roughness of Ra0.4-0.6um, and the Y-axis glossiness reaches 150-280GU. The performance of the finished product is adjusted by the thickness tolerance to ensure the performance of the finished steel strip. Among them, the processing technology of the SDH surface working roll is as follows: first, use an 80-mesh grinding wheel to grind to obtain a relatively rough surface of Ra0.6-1.0um, and the surface glossiness of the working roll reaches 150-250GU, and then use a laser texturing machine to perform laser texturing on the ground working roll to ensure the surface roughness Ra0.6-1.0um and the glossiness 100-250GU.

[0010] The sixth step is cleaning. The finished steel strip is removed from the surface of the steel strip at a speed of 80-100m / min on the degreasing cleaning unit to prepare for straightening.

[0011] The seventh step is straightening. The cleaned finished steel strip is straightened on the straightening machine, and the surface gloss of the steel strip is guaranteed to be 100-220GU by small pressure reduction and small elongation control. The gloss of each roll of material must be tested, which is the only step to control the surface gloss of the steel strip.

[0012] Step 8: Cut and pack. Cut and pack according to customer requirements and put into storage.

[0013] In the fourth step of solution treatment, in order to ensure the rolling hardness and surface gloss, the solution treatment is carried out under the protection of pure hydrogen or ammonia decomposition gas, and the dew point of the protective gas is strictly controlled below -70°C, in order to ensure that the surface of the steel strip does not turn blue during the solution treatment process. The heating section of the bright annealing furnace is 9 meters long.

[0014] The tensile straightening machine used in the seventh step of the straightening process is a 23-roller tensile straightening machine produced by Unger Company of Germany.

[0015] The above solution has the following advantages: The method of the present invention for producing a stainless steel belt with a dot-shaped coarse grain and matte SDH surface by using a laser texturing machine is as follows: material selection → primary rolling → cleaning → solution treatment → secondary rolling → cleaning → straightening, and a stainless steel belt with a dot-shaped coarse grain and matte SDH surface can be obtained. Since the SDH surface working roller used in the secondary rolling is laser texturing treated after grinding, the stainless steel belt with a dot-shaped coarse grain and matte SDH surface obtained through the entire process has no filaments when visually observed, is dot-shaped and drag-free under a 40X microscope, has a fine surface, and has a glossiness of 100-220GU in the Y-axis direction, which can fully meet customer needs. Moreover, when using the SDH surface working roller treated with laser texturing for production, there is no problem of randomness, the uniformity and stability are good, the input-output ratio is relatively high, and the production process is easy to control. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below with reference to the embodiments. Embodiment 1

[0017] The method of producing a stainless steel strip with a dot-shaped coarse grain matte SDH surface by using a laser texturing machine in this embodiment comprises the following steps: The first step is material selection. Select Zhangpu's SUS304 cold-rolled stainless steel billet with a thickness of more than 0.5 mm for use.

[0018] The second step is one-time rolling. The raw material thickness selected according to the finished product performance requirements is rolled in three passes. The last pass is rolled using SDH rough shot blasting roller Ra0.6-1.0um working roller, directly rolling to the semi-finished product thickness of 0.22+ / -0.01mm. At this time, the surface glossiness of the steel strip is low, only 100-160GU, and it is dot-shaped under a 40X microscope with light source.

[0019] The third step is cleaning. The rolled semi-finished products are removed from the surface of the steel strip at a speed of 80m / min on the degreasing and cleaning unit to prepare for the solution treatment.

[0020] The fourth step is solution treatment. The semi-finished steel strip that has been cleaned once is passed through a bright annealing furnace at a temperature of 1100-1140℃ at a speed of 9m / min. In order to ensure the rolling hardness and surface glossiness, the solution treatment is carried out under the protection of pure hydrogen or ammonia decomposition gas. The dew point of the protective gas is strictly controlled below -70℃ to ensure that the surface of the steel strip does not turn blue during the solution treatment process. The heating section length of the bright annealing furnace is 9 meters.

[0021] The fifth step is secondary rolling. For the first rolling, the SDH surface working roll produced by the laser texturing machine is directly used for rolling. The surface after rolling is a point surface roughness of Ra0.4-0.6um, and the Y-axis glossiness reaches 150-280GU. The performance of the finished product is adjusted by the thickness tolerance to ensure the performance of the finished steel strip. Among them, the processing technology of the SDH surface working roll is as follows: first, use an 80-mesh grinding wheel to grind to obtain a relatively rough surface of Ra0.6-1.0um, and the surface glossiness of the working roll reaches 150-250GU, and then use a laser texturing machine to perform laser texturing on the ground working roll to ensure the surface roughness Ra0.6-1.0um and the glossiness 100-250GU.

[0022] The sixth step is cleaning. The finished steel strip is removed from the surface of the steel strip at a speed of 80m / min on the degreasing and cleaning unit to prepare for straightening.

[0023] The seventh step is straightening. The cleaned finished steel strip is straightened on a straightening machine, and a small reduction and small elongation control are used to ensure that the surface gloss of the steel strip is 100-220GU. The gloss of each roll of material must be tested. This is the only step to control the surface gloss of the steel strip. The straightening machine is a 23-roll straightening machine produced by Unger, Germany.

[0024] Step 8: Cut and pack. Cut and pack according to customer requirements and put into storage. Embodiment 2

[0025] The method of producing a stainless steel strip with a dot-shaped coarse grain matte SDH surface by using a laser texturing machine in this embodiment comprises the following steps: The first step is material selection. Select Zhangpu's SUS304 cold-rolled stainless steel billet with a thickness of more than 0.5 mm for use.

[0026] The second step is one-time rolling. The raw material thickness selected according to the finished product performance requirements is rolled in 4 passes. The last pass is rolled using SDH rough shot blasting roller Ra0.6-1.0um working roller, directly rolling to the semi-finished product thickness of 0.22+ / -0.01mm. At this time, the surface glossiness of the steel strip is low, only 100-160GU, and it is dot-shaped under a 40X microscope with light source.

[0027] The third step is cleaning. The rolled semi-finished products are removed from the surface of the steel strip at a speed of 90m / min on the degreasing and cleaning unit to prepare for the solution treatment.

[0028] The fourth step is solution treatment. The semi-finished steel strip that has been cleaned once is passed through a bright annealing furnace at a temperature of 1100-1140°C at a speed of 11m / min. In order to ensure the rolling hardness and surface glossiness, the solution treatment is carried out under the protection of pure hydrogen or ammonia decomposition gas. The dew point of the protective gas is strictly controlled below -70°C to ensure that the surface of the steel strip does not turn blue during the solution treatment process. The heating section length of the bright annealing furnace is 9 meters.

[0029] The fifth step is secondary rolling. For the first rolling, the SDH surface working roll produced by the laser texturing machine is directly used for rolling. The surface after rolling is a point surface roughness of Ra0.4-0.6um, and the Y-axis glossiness reaches 150-280GU. The performance of the finished product is adjusted by the thickness tolerance to ensure the performance of the finished steel strip. Among them, the processing technology of the SDH surface working roll is as follows: first, use an 80-mesh grinding wheel to grind to obtain a relatively rough surface of Ra0.6-1.0um, and the surface glossiness of the working roll reaches 150-250GU, and then use a laser texturing machine to perform laser texturing on the ground working roll to ensure the surface roughness Ra0.6-1.0um and the glossiness 100-250GU.

[0030] The sixth step is cleaning. The finished steel strip is removed from the surface of the steel strip at a speed of 90m / min on the degreasing cleaning unit to prepare for straightening.

[0031] The seventh step is straightening. The cleaned finished steel strip is straightened on a straightening machine, and a small reduction and small elongation control are used to ensure that the surface gloss of the steel strip is 100-220GU. The gloss of each roll of material must be tested. This is the only step to control the surface gloss of the steel strip. The straightening machine is a 23-roll straightening machine produced by Unger, Germany.

[0032] Step 8: Cut and pack. Cut and pack according to customer requirements and put into storage. Embodiment 3

[0033] The method of producing a stainless steel strip with a dot-shaped coarse grain matte SDH surface by using a laser texturing machine in this embodiment comprises the following steps: The first step is material selection. Select Zhangpu's SUS304 cold-rolled stainless steel billet with a thickness of more than 0.5 mm for use.

[0034] The second step is one-time rolling. The raw material thickness selected according to the finished product performance requirements is rolled in 4 passes. The last pass is rolled using SDH rough shot blasting roller Ra0.6-1.0um working roller, directly rolling to the semi-finished product thickness of 0.22+ / -0.01mm. At this time, the surface glossiness of the steel strip is low, only 100-160GU, and it is dot-shaped under a 40X microscope with light source.

[0035] The third step is cleaning. The rolled semi-finished product is removed from the surface of the steel strip at a speed of 100m / min on the degreasing cleaning unit to prepare for the solution treatment.

[0036] The fourth step is solution treatment. The semi-finished steel strip that has been cleaned once is passed through a bright annealing furnace at a temperature of 1100-1140°C at a speed of 13m / min. In order to ensure the rolling hardness and surface glossiness, the solution treatment is carried out under the protection of pure hydrogen or ammonia decomposition gas. The dew point of the protective gas is strictly controlled below -70°C to ensure that the surface of the steel strip does not turn blue during the solution treatment process. The heating section length of the bright annealing furnace is 9 meters.

[0037] The fifth step is secondary rolling. For the first rolling, the SDH surface working roll produced by the laser texturing machine is directly used for rolling. The surface after rolling is a point surface roughness of Ra0.4-0.6um, and the Y-axis glossiness reaches 150-280GU. The performance of the finished product is adjusted by the thickness tolerance to ensure the performance of the finished steel strip. Among them, the processing technology of the SDH surface working roll is as follows: first, use an 80-mesh grinding wheel to grind to obtain a relatively rough surface of Ra0.6-1.0um, and the surface glossiness of the working roll reaches 150-250GU, and then use a laser texturing machine to perform laser texturing on the ground working roll to ensure the surface roughness Ra0.6-1.0um and the glossiness 100-250GU.

[0038] The sixth step is cleaning. The finished steel strip is removed from the surface of the steel strip at a speed of 100m / min on the degreasing cleaning unit to prepare for straightening.

[0039] The seventh step is straightening. The cleaned finished steel strip is straightened on a straightening machine, and a small reduction and small elongation control are used to ensure that the surface gloss of the steel strip is 100-220GU. The gloss of each roll of material must be tested. This is the only step to control the surface gloss of the steel strip. The straightening machine is a 23-roll straightening machine produced by Unger, Germany.

[0040] Step 8: Cut and pack. Cut and pack according to customer requirements and put into storage.

[0041] Since the method of producing point-shaped coarse-grained matte SDH surface stainless steel strip using a laser texturing machine of the present invention, the SDH surface working roller used in the secondary rolling is laser texturing treated after grinding, so the point-shaped coarse-grained matte SDH surface stainless steel strip obtained through the whole process has no filaments when visually observed, and is point-shaped without drag under a 40X microscope, with a fine surface and a glossiness of 100-220GU in the Y-axis direction, which can fully meet customer needs. Moreover, the production using the SDH surface working roller treated with laser texturing does not have the problem of randomness, has good uniformity and stability, has a relatively high input-output ratio, and is easy to control the production process.

Claims

1. A method for producing a stainless steel strip with a dot-shaped coarse grain matte SDH surface by using a laser texturing machine, characterized in that The following steps are involved: The first step is material selection Select Zhangpu's SUS304 cold-rolled stainless steel billet with a thickness of more than 0.5 mm for standby use; The second step is one-time rolling The raw material thickness selected according to the finished product performance requirements is rolled in 3-4 passes. The last pass is rolled using SDH rough shot blasting roller Ra0.6-1.0um working roller, directly rolling to the semi-finished product thickness of 0.22+ / -0.01mm. At this time, the surface glossiness of the steel strip is low, only 100-160GU, and it is dot-shaped under a 40X microscope with light source; Step 3: Cleaning The rolled semi-finished products are removed from the surface of the steel strip at a speed of 80-100m / min on the degreasing and cleaning unit to prepare for the solution treatment; Step 4: Solution treatment The semi-finished steel strip after one cleaning is passed through a bright annealing furnace at a temperature of 1100-1140°C at a speed of 9-13m / min; Step 5: Secondary rolling In one pass rolling, the SDH surface working roll produced by the laser texturing machine is directly used for rolling. The surface after rolling has a point surface roughness of Ra0.4-0.6um, and the Y-axis glossiness reaches 150-280GU. The performance of the finished product is adjusted by the thickness tolerance to ensure the performance of the finished steel strip; Among them, the SDH surface working roll processing technology is as follows: Firstly, the 80-mesh grinding wheel is used to grind to obtain a relatively rough surface of Ra0.6-1.0um, and the surface glossiness of the working roller reaches 150-250GU. Then, the laser texturing machine is used to perform laser texturing on the ground working roller to ensure the surface roughness of Ra0.6-1.0um and the glossiness of 100-250GU. Step 6. Cleaning The finished steel strip is removed from the surface of the steel strip at a speed of 80-100m / min on the degreasing and cleaning unit to prepare for straightening. Step 7: Straighten The cleaned finished steel strip is corrected on the tensioning and straightening machine, and the surface gloss of the steel strip is guaranteed to be 100-220GU by small pressure reduction and small elongation control. The glossiness of each roll of material must be tested, which is the only step to control the surface glossiness of the steel strip; Step 8: Cutting and packaging Cut, pack and store according to customer requirements.

2. The method for producing a stainless steel strip with a dot-shaped coarse grain matte SDH surface by using a laser texturing machine as claimed in claim 1, characterized in that In the fourth step of solution treatment, in order to ensure the rolling hardness and surface gloss, solution treatment is carried out under the protection of pure hydrogen or ammonia decomposition gas. The dew point of the protective gas is strictly controlled below -70°C. The purpose is to ensure that the surface of the steel strip does not turn blue during the solution treatment process.

3. The method for producing a stainless steel strip with a dot-shaped coarse grain matte SDH surface by using a laser texturing machine as claimed in claim 1, characterized in that In the fourth step of solution treatment, the heating section length of the bright annealing furnace is 9 meters.

4. The method for producing a stainless steel strip with a dot-shaped coarse grain matte SDH surface by using a laser texturing machine as claimed in claim 1, characterized in that The tensile straightening machine used in the seventh step of the straightening process is a 23-roller tensile straightening machine produced by Unger Company of Germany.