A surface hardening process for cold rolled stainless steel strip

Abstract

The application discloses a surface hardening process for cold-rolled stainless steel strips, and belongs to the technical field of surface hardening of cold-rolled stainless steel strips. In order to solve the technical problem that residues of oxides and grease on the surface of the cold-rolled stainless steel strips during pickling have a negative impact on surface hardening treatment, the surface hardening process for the cold-rolled stainless steel strips comprises the following steps: after annealing treatment of stainless steel raw materials, the stainless steel raw materials are sent into a cold-rolling machine to perform flattening, calendering and winding operations to obtain cold-rolled stainless steel strips; the cold-rolled stainless steel strips are cut through a cutting device; the cold-rolled stainless steel strips after cutting are pickled; after the pickling is completed, the cold-rolled stainless steel strips are washed clean of acid liquid on the cold-rolled stainless steel strips through deionized water and the cold-rolled stainless steel strips are dried; the cold-rolled stainless steel strips after cleaning are placed into a nitriding furnace to perform nitriding treatment; the cold-rolled stainless steel strips after nitriding are taken out of the nitriding furnace and sequentially subjected to cooling and cleaning to obtain the cold-rolled stainless steel strips after surface hardening treatment.

Description

Technical Field

[0001] The invention relates to the technical field of surface hardening of cold-rolled stainless steel strips, and in particular to a surface hardening process of cold-rolled stainless steel strips. Background Art

[0002] The surface hardening process is a process that changes the properties of the material surface to obtain higher hardness and wear resistance. Cold-rolled stainless steel strip is a cold-rolled stainless steel strip processed by the cold rolling process. Surface hardening treatment can further improve the hardness and wear resistance of the cold-rolled stainless steel strip, enhance its scratch resistance, wear resistance and durability. The gas nitriding process is often used to surface harden the cold-rolled stainless steel strip. By introducing nitrogen into the material surface under a high temperature environment, the nitrogen element penetrates into the metal lattice to form a nitride layer. The cold-rolled stainless steel strip needs to be pre-treated to remove surface oxides and grease during surface hardening. The current cold-rolled stainless steel strip is generally pre-treated by pickling, but the current pickling effect is not good, and the pickling speed is slow, resulting in oxides and grease residues on the surface of the cold-rolled stainless steel strip, which will have a negative impact on the surface hardening treatment of the cold-rolled stainless steel strip. Summary of the Invention

[0003] The object of the present invention is to provide a surface hardening process for cold-rolled stainless steel strips, which can solve the problem mentioned in the above background technology that the current pickling effect is poor, resulting in the residue of oxides and grease on the surface of the cold-rolled stainless steel strips, which will have a negative impact on the surface hardening treatment of the cold-rolled stainless steel strips.

[0004] To achieve the above object, the present invention provides the following technical solution: a surface hardening process for a cold-rolled stainless steel strip, comprising the following steps:

[0005] S1: After annealing the stainless steel raw material, the stainless steel raw material is sent to a cold rolling mill for flattening, rolling and coiling to obtain a cold-rolled stainless steel strip;

[0006] S2: Cut the cold-rolled stainless steel strip into the required size and shape through cutting equipment;

[0007] S3: Pickling the cold-rolled stainless steel strip after cutting to remove pollutants such as the oxide layer and oil on the surface of the stainless steel. After the pickling is completed, the acid on the cold-rolled stainless steel strip is rinsed with deionized water and the cold-rolled stainless steel strip is dried.

[0008] S4: placing the cleaned cold-rolled stainless steel strip into a nitriding furnace for nitriding treatment;

[0009] S5: After the nitriding is completed, the cold-rolled stainless steel strip is taken out from the nitriding furnace, cooled and cleaned in sequence to obtain a surface-hardened cold-rolled stainless steel strip.

[0010] Furthermore, S3 includes the following steps:

[0011] S301: Prepare a pickling solution by mixing hydrochloric acid, nitric acid, water, and sodium dodecylbenzenesulfonate in a ratio of 10:3:7:1. The concentrations of hydrochloric acid and nitric acid are both 15%. Pour the pickling solution into the pickling equipment.

[0012] S302: heating the pickling solution to 40-50°C by a heating device;

[0013] S303: placing the cold-rolled stainless steel strip in a pickling device for pickling for 20-25 minutes to remove impurities and grease on the surface of the cold-rolled stainless steel strip;

[0014] S304: fish out the cold-rolled stainless steel strip and rinse it with deionized water to obtain a cleaned cold-rolled stainless steel strip;

[0015] S305: drying the cold-rolled stainless steel strip.

[0016] Furthermore, S4 includes the following steps:

[0017] S401: placing the cleaned cold-rolled stainless steel strip into a nitriding furnace for nitriding treatment at a temperature of 900° C. for 7 hours;

[0018] S402: nitrogen gas is introduced into the nitriding furnace as a nitriding atmosphere, with a nitrogen concentration of 99.9% and a flow rate of 35 liters / minute;

[0019] S403: taking the cold-rolled stainless steel strip out of the nitriding furnace and cooling it appropriately;

[0020] S404: Clean the surface of the cold-rolled stainless steel strip after nitriding to remove oxides or residual impurities generated during the nitriding process.

[0021] Furthermore, the pickling equipment includes a pickling tank and a height adjustment assembly arranged through the pickling tank. The bottom of the height adjustment assembly is provided with an anti-sticking assembly for limiting the cold-rolled stainless steel strip and a swing assembly for stirring the pickling liquid. The anti-sticking assembly and the swing assembly are provided in multiple groups, and the multiple groups of the anti-sticking assembly and the swing assembly are arranged alternately in sequence. A stirring assembly for stirring the pickling liquid is embedded in one side of the pickling tank, and two groups of stirring assemblies are provided. A control unit is fixedly provided on one side of the pickling tank.

[0022] The height adjustment assembly includes a lifting component that is arranged through the outer surface of the pickling tank, and the lifting component is symmetrically arranged in two groups, a supporting component is arranged between the two groups of lifting components, the stirring assembly includes a driving component embedded in one side of the pickling tank and a movable component that is arranged through the outer surface of the driving component, a laser ranging sensor is fixedly connected to the inner wall of the pickling tank, and the laser ranging sensor is electrically connected to the control unit, the anti-fitting assembly includes an elastic component arranged at the upper end of the supporting component and a limiting component that is arranged through the elastic component, there are multiple groups of elastic components, and two groups of limiting components are symmetrically arranged, an extrusion block is fixedly connected to the inner wall of the pickling tank, the lifting component is used to drive the supporting component to lift and lower, the supporting component is used to transmit and thereby adjust the height of the limiting component, the driving component is used to adjust the position of the movable component, the laser ranging sensor is used to measure the position of the movable component, the movable component is used to stir the pickling liquid, the elastic component is used to drive the limiting component to move, the two groups of limiting components are used to limit the cold-rolled stainless steel strip, and the extrusion block is used to guide the limiting component.

[0023] Furthermore, movable cavities are provided inside both sides of the pickling tank, and the lifting components include an electric telescopic rod fixedly connected to the ground and a connecting plate fixedly connected to the upper end of the electric telescopic rod, and the electric telescopic rod is electrically connected to the control unit, and a transmission rod is fixedly connected to the lower end of the connecting plate, and one end of the transmission rod is embedded in the movable cavity and fixedly connected to a T-shaped transmission bar. A movable groove for the movement of the T-shaped transmission bar is provided on the inner wall of the pickling tank, and a fixed frame is fixedly connected between the two groups of T-shaped transmission bars, and a support plate is fixedly connected to the inner side of the fixed frame. The electric telescopic rod can drive the fixed frame to move through the connecting plate and the transmission rod, and the fixed frame and the support plate are used for transmission.

[0024] Furthermore, the elastic component includes a fixed plate fixedly connected to the upper end of the support plate, and two groups of fixed plates are arranged at intervals, a guide rod is fixedly connected between the two groups of fixed plates, and the second spring is fixedly connected on opposite sides of the two groups of fixed plates. The limiting component includes a movable frame arranged above the support plate, a first spring is fixedly connected between the two groups of movable frames, and mounting plates are fixedly connected on both sides of the movable frame, one side of the two groups of mounting plates is respectively fixedly connected to the other end of the two groups of second springs, the guide rod is used to guide the movable frame, and the second spring is used to push the movable frame to move.

[0025] Furthermore, fixed rods are fixedly connected on both sides of the mobile frame, and an extrusion rod is fixedly connected on the other side of the mobile frame, and multiple groups of extrusion rods are provided. The fixed rods and the extrusion blocks are arranged correspondingly. The lower end of the mobile frame is embedded in and fixedly connected to a mounting block, and a rolling ball is movably embedded in the lower end of the mounting block. The rolling ball is rotatably connected to the inner wall of the mounting block through a rotating shaft, and the outer surface of the rolling ball is in contact with the upper end of the support plate. The rolling ball is used to reduce the resistance of the mobile frame when it moves, the extrusion rod is used to extrude the cold-rolled stainless steel strip, and the extrusion block is used to guide the fixed rod.

[0026] Furthermore, the driving component includes a motor fixedly connected to one side of the pickling tank through an arc plate and a screw fixedly connected to the output end of the motor, and the motor is electrically connected to the control unit. The screw is embedded in both sides of the pickling tank for rotation, and a limit rod is fixedly connected between the inner walls of both sides of the pickling tank. The moving component includes a threaded block connected to the outer surface of the screw through a thread, and the threaded block and the limit rod are movably connected through a thread. A group of the threaded blocks are provided with a pushing member on the outer surface, and a moving plate is fixedly connected to the upper end of the threaded block, and the moving plate is arranged corresponding to the laser ranging sensor. The motor is used to drive the screw to rotate, so that the threaded block moves on the outer surface of the screw, and the laser ranging sensor is used to detect the distance between the moving plate and the laser ranging sensor.

[0027] Furthermore, the lower end of the threaded block is rotatably connected to a rotating shaft, a connecting rod is fixedly connected to one side of the threaded block, and a triangular pushing block is fixedly connected to the other end of the connecting rod. Gears and stirring blades are fixedly connected to the outer surface of the rotating shaft at intervals, and a rack is fixedly connected to the inner wall of one side of the pickling tank, and the gear is meshed with the rack. The rack is used to drive the gear to rotate, and the rotating shaft is used for transmission.

[0028] Furthermore, the swinging assembly includes a rotating column rotatably connected to the upper end of the support plate and a square hole plate fixedly connected to the upper end of the rotating column. A torsion spring is fixedly connected to the outer surface of the rotating column, and the other end of the torsion spring is fixedly connected to the upper end of the support plate. An L-shaped transmission plate is fixedly connected to the upper end of the square hole plate. The L-shaped transmission plate is arranged corresponding to the triangular pushing block. The triangular pushing block is used to push the L-shaped transmission plate, and the L-shaped transmission plate is used to transmit so that the square hole plate deflects.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a surface hardening process for a cold-rolled stainless steel strip. The process comprises the following steps: annealing a stainless steel raw material, feeding the stainless steel raw material into a cold rolling mill for flattening, rolling, and coiling to obtain a cold-rolled stainless steel strip; cutting the cold-rolled stainless steel strip into a desired size and shape by a cutting device; pickling the cold-rolled stainless steel strip after cutting to remove pollutants such as an oxide layer and oil stains on the stainless steel surface; rinsing the acid solution on the cold-rolled stainless steel strip with deionized water after the pickling, and drying the cold-rolled stainless steel strip; placing the cleaned cold-rolled stainless steel strip into a nitriding furnace for nitriding; removing the cold-rolled stainless steel strip from the nitriding furnace, and sequentially cooling and cleaning to obtain a surface-hardened cold-rolled stainless steel strip. The pickling is performed by the pickling device, the pickling solution comprises hydrochloric acid, nitric acid, water, and sodium dodecylbenzenesulfonate in a ratio of 10:3:7:1, the pickling temperature is 40-50°C, and the pickling time is 20-25 minutes. The pickling process can improve the removal effect and speed of oxides and grease on the surface of the cold-rolled stainless steel strip.

[0031] The present invention proposes a surface hardening process for a cold-rolled stainless steel strip, which achieves the purpose of improving the pickling effect of the cold-rolled stainless steel strip by arranging an elastic component, a limiting component, an extrusion block, a driving component, a moving component, a laser ranging sensor, a lifting component, a supporting component and a swinging component, and solves the problem that the pickling effect of the cold-rolled stainless steel strip is poor due to the easy adhesion of multiple cold-rolled stainless steel strips and uneven pickling liquid during pickling. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is an overall process flow chart of a surface hardening process for a cold-rolled stainless steel strip according to the present invention;

[0033] Figure 2 This is a process flow chart of the pickling process for the surface hardening of a cold-rolled stainless steel strip according to the present invention;

[0034] Figure 3 This is a process flow chart of nitriding of a cold-rolled stainless steel strip according to the present invention;

[0035] Figure 4 This is a schematic diagram of the overall three-dimensional structure of a surface hardening process for a cold-rolled stainless steel strip according to the present invention;

[0036] Figure 5 This is a schematic diagram of the internal structure of a pickling tank for a surface hardening process of a cold-rolled stainless steel strip according to the present invention;

[0037] Figure 6 This is a schematic diagram of the structure of an active cavity in a surface hardening process for a cold-rolled stainless steel strip according to the present invention;

[0038] Figure 7 This is a schematic structural diagram of a lifting component and a supporting component in a surface hardening process for a cold-rolled stainless steel strip according to the present invention;

[0039] Figure 8 This is a schematic diagram of the anti-sticking component structure of a surface hardening process for a cold-rolled stainless steel strip according to the present invention;

[0040] Figure 9 This is a schematic structural diagram of an elastic component and a limiting component in a surface hardening process for a cold-rolled stainless steel strip according to the present invention;

[0041] Figure 10 This is a schematic diagram of the mounting block and rolling ball structure of a surface hardening process for a cold-rolled stainless steel strip according to the present invention;

[0042] Figure 11 This is a schematic structural diagram of a driving component and a moving component of a surface hardening process for a cold-rolled stainless steel strip according to the present invention;

[0043] Figure 12This is a schematic diagram of the structure of an oscillating assembly for a surface hardening process of a cold-rolled stainless steel strip according to the present invention.

[0044] In the figure: 1. Pickling tank; 11. Active cavity; 2. Anti-sticking assembly; 21. Elastic component; 211. Fixed plate; 212. Guide rod; 213. Second spring; 22. Limiting component; 221. Mounting plate; 222. Moving frame; 223. Extrusion rod; 224. Fixed rod; 225. Mounting block; 226. Rolling ball; 23. First spring; 24. Extrusion block; 3. Stirring assembly; 31. Driving component; 311. Motor; 312. Screw rod; 313. Limiting rod; 32. Moving component; 321. Threaded block; 322. Rotating shaft; 323. Stirring blade; 324. Gear; 325. Pusher; 3251. Connecting rod; 3252. Triangular pusher; 326. Moving plate; 327. Rack; 33. Laser ranging sensor; 4. Height adjustment component; 41. Lifting component; 411. Electric telescopic rod; 412. Connecting plate; 413. Transmission rod; 414. T-shaped transmission bar; 42. Support component; 421. Fixed frame; 422. Support plate; 5. Swinging component; 51. Rotating column; 52. Torsion spring; 53. Square hole plate; 54. L-shaped transmission plate; 6. Control unit. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] like Figure 1 As shown, a surface hardening process for a cold-rolled stainless steel strip comprises the following steps:

[0047] Step 1: After annealing the stainless steel raw material, the stainless steel raw material is sent to a cold rolling mill for flattening, rolling and coiling to obtain a cold-rolled stainless steel strip;

[0048] Step 2: Cut the cold-rolled stainless steel strip into the required size and shape through cutting equipment;

[0049] Step 3: Pickling the cold-rolled stainless steel strip after cutting to remove the oxide layer and oil stains on the surface of the stainless steel. After pickling, rinse the cold-rolled stainless steel strip with deionized water and dry it.

[0050] Step 4: Place the cleaned cold-rolled stainless steel strip into a nitriding furnace for nitriding treatment;

[0051] Step 5: After the nitriding is completed, the cold-rolled stainless steel strip is taken out from the nitriding furnace, cooled and cleaned in sequence to obtain a surface-hardened cold-rolled stainless steel strip.

[0052] The present invention will be further described below with reference to the embodiments. Example 1

[0053] See also Figure 2 , step three includes the following steps:

[0054] (1): Prepare a pickling solution by mixing hydrochloric acid, nitric acid, water and sodium dodecylbenzenesulfonate in a ratio of 10:3:7:1. The concentrations of hydrochloric acid and nitric acid are both 15%. Pour the pickling solution into the pickling equipment.

[0055] (2): Heat the pickling solution to 40-50°C using a heating device;

[0056] (3): Place the cold-rolled stainless steel strip in the pickling equipment for pickling for 20-25 minutes to remove impurities and grease on the surface of the cold-rolled stainless steel strip;

[0057] (4): Take out the cold-rolled stainless steel strip and rinse it with deionized water to obtain a cleaned cold-rolled stainless steel strip;

[0058] (5): Dry the cold rolled stainless steel strip.

[0059] See also Figure 3 , step four includes the following steps:

[0060] (1): Place the cleaned cold-rolled stainless steel strip into a nitriding furnace for nitriding treatment at a temperature of 900°C for 7 hours;

[0061] (2): Nitrogen is introduced into the nitriding furnace as the nitriding atmosphere. The concentration of nitrogen is 99.9% and the flow rate is 35 liters / minute.

[0062] (3): Take the cold-rolled stainless steel strip out of the nitriding furnace and cool it appropriately;

[0063] (4): Clean the surface of the cold-rolled stainless steel strip after nitriding to remove oxides or residual impurities generated during the nitriding process. Example 2

[0064] See also Figure 4-12The pickling equipment includes a pickling tank 1 and a height adjustment component 4 that is arranged through the pickling tank 1. The bottom of the height adjustment component 4 is provided with an anti-sticking component 2 for limiting the cold-rolled stainless steel strip and a swing component 5 for stirring the pickling liquid. There are multiple groups of anti-sticking components 2 and swing components 5, and the multiple groups of anti-sticking components 2 and swing components 5 are arranged alternately in sequence. A stirring component 3 for stirring the pickling liquid is embedded on one side of the pickling tank 1, and there are two groups of stirring components 3. A control unit 6 is fixedly provided on one side of the pickling tank 1. The height adjustment component 4 includes a lifting component 41 that is arranged through the outer surface of the pickling tank 1, and two groups of lifting components 41 are symmetrically arranged. A support component 42 is arranged between the two groups of lifting components 41. The stirring component 3 includes A driving component 31 is embedded in one side of the pickling tank 1, and a moving component 32 is provided through the outer surface of the driving component 31. A laser ranging sensor 33 is fixedly connected to the inner wall of the pickling tank 1, and the laser ranging sensor 33 is electrically connected to the control unit 6. The anti-sticking component 2 includes an elastic component 21 provided at the upper end of the supporting component 42 and a limiting component 22 provided through the elastic component 21. There are multiple groups of elastic components 21, and two groups of limiting components 22 are symmetrically provided. An extrusion block 24 is fixedly connected to the inner wall of the pickling tank 1. The lifting component 41 is used to drive the supporting component 42 to rise and fall, and the supporting component 42 is used to transmit and adjust the height of the limiting component 22. The driving component 31 is used to adjust the position of the moving component 32, and the laser ranging sensor 33 is used to measure The position of the movable component 32 is measured, the movable component 32 is used to stir the pickling liquid, the elastic component 21 is used to drive the limiting component 22 to move, the two groups of limiting components 22 are used to limit the cold-rolled stainless steel strip, and the extrusion block 24 is used to guide the limiting component 22. Active cavities 11 are provided on both sides of the pickling tank 1. The lifting component 41 includes an electric telescopic rod 411 fixedly connected to the ground and a connecting plate 412 fixedly connected to the upper end of the electric telescopic rod 411, and the electric telescopic rod 411 is electrically connected to the control unit 6. The lower end of the connecting plate 412 is fixedly connected to a transmission rod 413, one end of the transmission rod 413 is embedded in the active cavity 11 and fixedly connected to a T-shaped transmission bar 414, and the inner wall of the pickling tank 1 is provided with a movable groove for the T-shaped transmission bar 414 to move. The fixing frame 421 is fixedly connected between the T-shaped transmission bars 414 of the two groups, and the inner side of the fixing frame 421 is fixedly connected to the support plate 422. The electric telescopic rod 411 can drive the fixing frame 421 to move through the connecting plate 412 and the transmission rod 413. The fixing frame 421 and the support plate 422 are used for transmission. The height of the support plate 422 can be adjusted by the extension and contraction of the electric telescopic rod 411. The elastic component 21 includes a fixing plate 211 fixedly connected to the upper end of the support plate 422, and the fixing plates 211 are arranged in two groups at intervals. A guide rod 212 is fixedly connected between the fixing plates 211 of the two groups. The opposite sides of the fixing plates 211 of the two groups are fixedly connected to the second spring 213. The limiting component 22 includes a movable frame 222 arranged above the support plate 422.A first spring 23 is fixedly connected between the two groups of mobile frames 222, and both sides of the mobile frames 222 are fixedly connected to the mounting plates 221. One side of the mounting plates 221 of the two groups is fixedly connected to the other end of the second springs 213 of the two groups. The guide rod 212 is used to guide the mobile frames 222, and the second spring 213 is used to push the mobile frames 222 to move. The first spring 23 and the second springs 213 of the two groups can make the two groups of mobile frames 222 approach each other. Both sides of the mobile frames 222 are fixedly connected to fixed rods 224, and the other side of the mobile frames 222 is fixedly connected to extrusion rods 223, and multiple groups of extrusion rods 223 are provided. The fixed rods 224 are correspondingly arranged with the extrusion blocks 24. The lower end of the mobile frame 222 is embedded and fixedly connected with the mounting block 225. The lower end of the mounting block 225 is movably embedded with a rolling ball 226, and the rolling ball 226 is rotatably connected to the inner wall of the mounting block 225 through a rotating shaft. The outer surface of the rolling ball 226 is in contact with the upper end of the support plate 422. The rolling ball 226 is used to reduce the resistance of the movable frame 222 when it moves. The extrusion rod 223 is used to extrude the cold-rolled stainless steel strip. The extrusion block 24 is used to guide the fixed rod 224. When the support plate 422 moves upward, it will drive the fixed plate 211, the guide rod 212, the movable frame 222 and the fixed rod 224 to move. When the fixed rod 224 moves a certain distance, it will be pushed by the extrusion block 24, so that the two groups of fixed rods 224 are separated from each other, thereby making the two groups of movable frames 222 also separated from each other, which is convenient for placing the cold-rolled stainless steel strip. The pressing rod 223 is used to squeeze the cold-rolled stainless steel strip to limit it. Since the contact area between the squeezing rod 223 and the cold-rolled stainless steel strip is very small, the negative impact on the pickling of the cold-rolled stainless steel strip can be reduced. The driving component 31 includes a motor 311 fixedly connected to one side of the pickling tank 1 through an arc plate and a screw rod 312 fixedly connected to the output end of the motor 311, and the motor 311 is electrically connected to the control unit 6. The screw rod 312 is embedded in both sides of the pickling tank 1 for rotation. A limiting rod 313 is fixedly connected between the inner walls of both sides of the pickling tank 1. The moving component 32 includes a threaded block 321 that is threadedly connected to the outer surface of the screw rod 312, and the threaded block 321 is movably connected to the limiting rod 313. A group of threaded blocks 321 are provided with a pushing member 32 on the outer surface. 5. The upper end of the threaded block 321 is fixedly connected to a movable plate 326, and the movable plate 326 is correspondingly arranged to the laser distance sensor 33. The motor 311 is used to drive the screw rod 312 to rotate, so that the threaded block 321 moves on the outer surface of the screw rod 312. The laser distance sensor 33 is used to detect the distance between the movable plate 326 and the laser distance sensor 33, so that the accurate position of the threaded block 321 can be controlled by the control unit 6 to prevent the rotating shaft 322 and the stirring blade 323 from affecting the movement of the movable frame 222 and the fixed rod 224. When the screw rod 312 rotates, it can drive the threaded block 321 to move horizontally along the screw rod 312. The lower end of the threaded block 321 is rotatably connected to the rotating shaft 322, and one side of the threaded block 321 is fixedly connected to the connecting rod 3251.The other end of the connecting rod 3251 is fixedly connected to a triangular pushing block 3252, and the outer surface of the rotating shaft 322 is fixedly connected to a gear 324 and a stirring blade 323 at intervals. A rack 327 is fixedly connected to the inner wall of one side of the pickling tank 1, and the gear 324 is meshed with the rack 327. The rack 327 is used to drive the gear 324 to rotate, and the rotating shaft 322 is used for transmission. When the threaded block 321 moves, it can drive the rotating shaft 322 and the connecting rod 3251 to move together, and the rotating shaft 322 will drive the gear 324 and the stirring blade 323 to move. When the gear 324 rotates, it will drive the rotating shaft 322 to rotate, so that the stirring blade 323 also rotates, which can stir the pickling solution evenly and avoid the phenomenon of insufficient local pickling. The swing assembly 5 includes a rotating column 51 rotatably connected to the upper end of the support plate 422 and a rotating column 51 fixedly connected to the rotating column 5 The square hole plate 53 at the upper end of the rotating column 51 is fixedly connected to the outer surface of the rotating column 51 with a torsion spring 52. The other end of the torsion spring 52 is fixedly connected to the upper end of the support plate 422. The upper end of the square hole plate 53 is fixedly connected to an L-shaped transmission plate 54. The L-shaped transmission plate 54 is correspondingly arranged with the triangular push block 3252. The triangular push block 3252 is used to push the L-shaped transmission plate 54. The L-shaped transmission plate 54 is used to transmit and deflect the square hole plate 53. After the triangular push block 3252 moves to contact the L-shaped transmission plate 54, it pushes the L-shaped transmission plate 54, causing the L-shaped transmission plate 54 to deflect, thereby causing the square hole plate 53 to deflect. At the same time, the torsion spring 52 is twisted. After the L-shaped transmission plate 54 deflects a certain angle, it separates from the triangular push block 3252, causing the square hole plate 53 to swing under the elastic force of the torsion spring 52, which can make the pickling liquid more uniform.

[0065] First, the control unit 6 controls the electric telescopic rod 411 to extend a certain distance, so that the support plate 422, the movable frame 222 and the fixed rod 224 all move upward, so that the two groups of movable frames 222 are squeezed away by the squeezing block 24 through the fixed rod 224. At this time, the cold-rolled stainless steel strip can be placed between the two groups of movable frames 222. Then, the control unit 6 controls the electric telescopic rod 411 to shorten a certain distance, so that the cold-rolled stainless steel strip is immersed in the pickling liquid, and the two groups of movable frames 222 are brought closer to each other by the first spring 23 and the two groups of second springs 213. The extrusion rod 223 of the group can limit the cold-rolled stainless steel strip, which can prevent the cold-rolled stainless steel strips from sticking to each other during pickling. Then, the control unit 6 controls the motor 311 to start, so that the threaded block 321 moves back and forth on the outer surface of the pushing member 325. When the threaded block 321 moves, the rotation of the gear 324 causes the stirring blade 323 to rotate continuously, which can stir the pickling solution evenly. At the same time, the triangular pushing block 3252 will reciprocate the L-shaped transmission plate 54, so that the square hole plate 53 swings, which can promote the uniformity of the pickling solution, thereby improving the pickling effect of the cold-rolled stainless steel strip.

[0066] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0067] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A surface hardening process for a cold-rolled stainless steel strip, characterized in that: The following steps are involved: S1: After annealing the stainless steel raw material, the stainless steel raw material is sent to a cold rolling mill for flattening, rolling and coiling to obtain a cold-rolled stainless steel strip; S2: Cut the cold-rolled stainless steel strip into the required size and shape through cutting equipment; S3: Pickling the cold-rolled stainless steel strip after cutting to remove the oxide layer and oil contaminants on the stainless steel surface. After the pickling is completed, the acid on the cold-rolled stainless steel strip is rinsed with deionized water and the cold-rolled stainless steel strip is dried. S4: placing the cleaned cold-rolled stainless steel strip into a nitriding furnace for nitriding treatment; S5: After the nitriding is completed, the cold-rolled stainless steel strip is taken out from the nitriding furnace, cooled and cleaned in sequence to obtain a surface-hardened cold-rolled stainless steel strip; S3 includes the following steps: S301: Prepare a pickling solution by mixing hydrochloric acid, nitric acid, water, and sodium dodecylbenzenesulfonate in a ratio of 10:3:7:

1. The concentrations of hydrochloric acid and nitric acid are both 15%. Pour the pickling solution into the pickling equipment. The pickling equipment comprises a pickling tank (1) and a height adjustment component (4) provided through the pickling tank (1); an anti-sticking component (2) for limiting the position of the cold-rolled stainless steel strip and a swing component (5) for stirring the pickling liquid are provided at the bottom of the height adjustment component (4); the anti-sticking component (2) and the swing component (5) are provided in multiple groups, and the multiple groups of the anti-sticking components (2) and the swing components (5) are alternately provided in sequence; a stirring component (3) for stirring the pickling liquid is embedded in one side of the pickling tank (1); the stirring component (3) comprises a driving component (31) embedded in one side of the pickling tank (1) and a moving component (32) provided through the outer surface of the driving component (31); The height adjustment assembly (4) includes a lifting component (41) that is arranged to penetrate the outer surface of the pickling tank (1), and a movable cavity (11) is opened inside both sides of the pickling tank (1). The lifting component (41) includes an electric telescopic rod (411) fixedly connected to the ground and a connecting plate (412) fixedly connected to the upper end of the electric telescopic rod (411). The lower end of the connecting plate (412) is fixedly connected to a transmission rod (413), one end of the transmission rod (413) is embedded in the movable cavity (11) and fixedly connected to a T-shaped transmission bar (414), and an movable groove for the T-shaped transmission bar (414) to move is opened on the inner wall of the pickling tank (1). A fixed frame (421) is fixedly connected between the two groups of the T-shaped transmission bars (414), and a support plate (422) is fixedly connected to the inner side of the fixed frame (421); The driving component (31) includes a motor (311) fixedly connected to one side of the pickling tank (1) through an arc plate, and a screw rod (312) fixedly connected to the output end of the motor (311); The moving part (32) includes a threaded block (321) connected to the outer surface of the screw rod (312) through a thread, and a group of pushing members (325) are provided on the outer surface of the threaded block (321); The lower end of the threaded block (321) is rotatably connected to a rotating shaft (322), one side of the threaded block (321) is fixedly connected to a connecting rod (3251), and the other end of the connecting rod (3251) is fixedly connected to a triangular push block (3252); The swing assembly (5) includes a rotating column (51) rotatably connected to the upper end of the support plate (422) and a square hole plate (53) fixedly connected to the upper end of the rotating column (51). A torsion spring (52) is fixedly connected to the outer surface of the rotating column (51). The other end of the torsion spring (52) is fixedly connected to the upper end of the support plate (422). An L-shaped transmission plate (54) is fixedly connected to the upper end of the square hole plate (53). The L-shaped transmission plate (54) is correspondingly arranged with a triangular push block (3252). The triangular push block (3252) is used to push the L-shaped transmission plate (54). The L-shaped transmission plate (54) is used to transmit so that the square hole plate (53) deflects.

2. The surface hardening process for a cold-rolled stainless steel strip according to claim 1, characterized in that: S3 also includes the following steps: S302: heating the pickling solution to 40-50°C by a heating device; S303: placing the cold-rolled stainless steel strip in a pickling device for pickling for 20-25 minutes to remove impurities and grease on the surface of the cold-rolled stainless steel strip; S304: fish out the cold-rolled stainless steel strip and rinse it with deionized water to obtain a cleaned cold-rolled stainless steel strip; S305: drying the cold-rolled stainless steel strip.

3. The surface hardening process for a cold-rolled stainless steel strip according to claim 1, characterized in that: S4 includes the following steps: S401: placing the cleaned cold-rolled stainless steel strip into a nitriding furnace for nitriding treatment at a temperature of 900° C. for 7 hours; S402: nitrogen gas is introduced into the nitriding furnace as a nitriding atmosphere, with a nitrogen concentration of 99.9% and a flow rate of 35 liters / minute; S403: taking the cold-rolled stainless steel strip out of the nitriding furnace and cooling it appropriately; S404: Clean the surface of the cold-rolled stainless steel strip after nitriding to remove oxides or residual impurities generated during the nitriding process.

4. The surface hardening process for a cold-rolled stainless steel strip according to claim 2, wherein: Two groups of stirring components (3) are provided, and a control unit (6) is fixedly provided on one side of the pickling tank (1); Two groups of lifting components (41) are symmetrically arranged, and a support component (42) is arranged between the two groups of lifting components (41). A laser distance sensor (33) is fixedly connected to the inner wall of the pickling tank (1), and the laser distance sensor (33) is electrically connected to the control unit (6). The anti-sticking component (2) includes an elastic component (21) arranged at the upper end of the support component (42) and a limiting component (22) arranged through the elastic component (21). The elastic component (21) is provided with multiple groups, and the limiting component (22) is symmetrically arranged in two groups. The inner wall of the pickling tank (1) is fixedly connected with an extrusion component (33). The pressing block (24) is used to drive the supporting component (42) to move up and down, the supporting component (42) is used to transmit and thereby adjust the height of the limiting component (22), the driving component (31) is used to adjust the position of the moving component (32), the laser ranging sensor (33) is used to measure the position of the moving component (32), the moving component (32) is used to stir the pickling liquid, the elastic component (21) is used to drive the limiting component (22) to move, the two groups of limiting components (22) are used to limit the cold-rolled stainless steel strip, and the extrusion block (24) is used to guide the limiting component (22).

5. The surface hardening process for a cold-rolled stainless steel strip according to claim 4, characterized in that: The electric telescopic rod (411) is electrically connected to the control unit (6). The electric telescopic rod (411) can drive the fixed frame (421) to move through the connecting plate (412) and the transmission rod (413). The fixed frame (421) and the support plate (422) are used for transmission.

6. A surface hardening process for a cold-rolled stainless steel strip according to claim 5, characterized in that: The elastic component (21) includes a fixed plate (211) fixedly connected to the upper end of the support plate (422), and two groups of fixed plates (211) are arranged at intervals. A guide rod (212) is fixedly connected between the two groups of fixed plates (211), and the opposite sides of the two groups of fixed plates (211) are fixedly connected to the second spring (213). The limiting component (22) includes a movable frame (222) arranged above the support plate (422), a first spring (23) is fixedly connected between the two groups of movable frames (222), and both sides of the movable frame (222) are fixedly connected to the mounting plates (221). One side of the two groups of mounting plates (221) is fixedly connected to the other end of the two groups of second springs (213), the guide rod (212) is used to guide the movable frame (222), and the second spring (213) is used to push the movable frame (222) to move.

7. A surface hardening process for a cold-rolled stainless steel strip according to claim 6, characterized in that: Both sides of the movable frame (222) are fixedly connected with fixed rods (224), and the other side of the movable frame (222) is fixedly connected with an extrusion rod (223), and multiple groups of extrusion rods (223) are provided. The fixed rods (224) and the extrusion blocks (24) are provided correspondingly. The lower end of the movable frame (222) is embedded with a mounting block (225) and fixedly connected thereto. The lower end of the mounting block (225) is movably embedded with a rolling ball (226). The rolling ball (226) is rotatably connected to the inner wall of the mounting block (225) through a rotating shaft. The outer surface of the rolling ball (226) is contacted with the upper end of the support plate (422). The rolling ball (226) is used to reduce the resistance when the movable frame (222) moves. The extrusion rod (223) is used to extrude the cold-rolled stainless steel strip, and the extrusion block (24) is used to guide the fixed rod (224).

8. The surface hardening process for a cold-rolled stainless steel strip according to claim 5, characterized in that: The motor (311) is electrically connected to the control unit (6), the screw rod (312) is embedded in both sides of the pickling tank (1) for rotational connection, a limit rod (313) is fixedly connected between the inner walls of both sides of the pickling tank (1), a movable plate (326) is fixedly connected to the upper end of the threaded block (321), and the movable plate (326) and the laser distance sensor (33) are correspondingly arranged, the motor (311) is used to drive the screw rod (312) to rotate, thereby causing the screw rod (321) to move on the outer surface of the screw rod (312), and the laser distance sensor (33) is used to detect the distance between the movable plate (326) and the laser distance sensor (33).

9. The surface hardening process for a cold-rolled stainless steel strip according to claim 8, characterized in that: The outer surface of the rotating shaft (322) is fixedly connected with a gear (324) and a stirring blade (323) at intervals. A rack (327) is fixedly connected to the inner wall of one side of the pickling tank (1), and the gear (324) is meshed with the rack (327). The rack (327) is used to drive the gear (324) to rotate, and the rotating shaft (322) is used for transmission.

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