Process for eliminating bucking head and surface defects of hot-rolled stainless steel clad strip

Abstract

The application discloses a process for eliminating the bucking head and surface defects of hot-rolled stainless steel composite plate strip rolling, and specifically comprises the following steps: 1) slab heating; 2) high-pressure water phosphorus removal; 3) slab rough rolling; the heated slab is conveyed to a rough rolling mill through a transmission roller, and a corresponding heat preservation cover is arranged on the conveying device; the rough rolling is performed in five passes, and a corresponding scale cleaning device is arranged between the first pass and the second pass to reduce the occurrence of the bucking head defects during the rolling of the stainless steel composite plate; 4) hot coil box curling of the stainless steel plate; 5) flying shear cutting of the head and tail of the stainless steel plate; 6) slab finishing rolling; and 7) cooling and curling transfer. According to the application, the vibration mechanism, the cleaning mechanism and the cleaning roller mechanism in the scale cleaning device can further remove the scale attached to the surface of the stainless steel composite plate and the roller, effectively reduce the friction of the roller surface and ensure the temperature consistency of the upper and lower surfaces of the stainless steel composite plate.

Description

Technical Field

[0001] This invention belongs to the field of stainless steel plate rolling technology, and specifically relates to a process for eliminating warping and surface defects in hot-rolled stainless steel composite strip. Background Technology

[0002] Stainless steel composite plates are made of a carbon steel base layer and a stainless steel cladding layer. The materials and thicknesses can be freely combined to meet the needs of different users. Stainless steel composite plates not only have the corrosion resistance of stainless steel, but also the good mechanical strength and processing performance of carbon steel. They are now widely used in industries such as petroleum, chemical, salt, water conservancy and power. As a resource-saving product, stainless steel composite plates reduce the consumption of precious metals and significantly reduce project costs. They achieve a perfect combination of low cost and high performance, resulting in good social benefits.

[0003] Various rolling defects often occur during the rolling process of stainless steel composite plates and stainless steel plates, including the defect of warping. The slab may warp upwards (warping) or bend downwards (bending) for various reasons. Warping makes the head of the steel plate prone to collision with the guard plate, protective plate or testing instruments. In severe cases, it may prevent the strip from entering the rolling mill, causing steel pile-up accidents. Bending causes the steel plate to collide with the stand rolls or roller table. In severe cases, it may cause the strip to damage the flower rack on the roller table, causing the plate to be crushed and crawl under the roller table, bringing many disadvantages to production.

[0004] A search revealed that Yang Cheng, a technician at the Wuhan Iron and Steel Group's hot-rolled strip steel plant, published a research paper titled "Analysis and Improvement of the Causes of Strip Steel Curving (Buttoning)". His references included the Wuhan Iron and Steel Group's hot-rolled strip steel plant's technical operation procedure B standard and "Rolling Technology" edited by Wang Tingpu of Northeastern Institute of Technology. The paper clearly pointed out that the causes of the curling defects in strip steel rolling include uneven heating temperature, inconsistent roll diameter, improper adjustment of the wire binding height, residual iron oxide scale covering the slab, and inconsistent roll roughness and friction coefficient.

[0005] Inconsistent temperatures between the upper and lower layers of the slab cause uneven elongation after rolling, resulting in upward or downward bending, which is easily observed in rolled products with larger cross-sections. When rolling on a slab with residual iron oxide scale, the slab tends to bend towards the side with scale. This is because the residual scale causes slippage during low rolling temperatures. Furthermore, the scale on the rolls causes uneven surface roughness, leading to inconsistent roll elongation and resulting in warped ends. To address these issues, appropriate scale removal solutions can be implemented to reduce the likelihood of warped ends during rolling.

[0006] Further research revealed a hot-rolled strip production process for corrosion-resistant stainless steel-carbon steel composite plates, disclosed in publication number CN 116371916 A. The specific process steps are as follows: 1) Surface treatment of the base plate and cladding plate; 2) Assembly welding; 3) Vacuuming of the composite plate; 4) Heating; 5) High-pressure water descaling: removing oxide scale from the heated composite plate surface using high-pressure water; 6) Rough rolling: performing seven passes of rolling on the composite plate during rough rolling; 7) Descaling before finish rolling: removing oxide scale generated on the surface of the rough-rolled composite plate using a descaling device; 8) Finish rolling: conveying the plate to the finish rolling mechanism, where speed-increasing rolling is employed; 9) Coiling: after finish rolling, the plate is fed into a coiling mechanism for coiling. This invention, by setting a descaling device before finish rolling, avoids prolonged contact of water and removed oxide scale on the surface of the stainless steel-carbon steel composite plate while performing multi-stage descaling. This solution provides a stainless steel composite plate rolling process.

[0007] Based on the existing technologies retrieved above, and addressing the rolling problems and solutions, this invention provides a process for eliminating warping and surface defects in the rolling of hot-rolled stainless steel composite strip. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a process to eliminate warping and surface defects in hot-rolled stainless steel composite strip. Based on the rolling process, the oxide scale adhering to the surface of the stainless steel composite plate and the rolls can be further removed by the vibration mechanism, cleaning mechanism and cleaning roll mechanism in the oxide scale cleaning device, which effectively reduces the friction of the roll surface and ensures the temperature consistency of the upper and lower layers of the stainless steel composite plate.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A process for eliminating warping and surface defects in hot-rolled stainless steel composite strips, comprising the following steps:

[0011] 1) Slab heating: The heating process consists of a preheating section, a first heating section, a second heating section, and a soaking section. The heating process is further divided into these sections: preheating section, first heating section, second heating section, and soaking section; preheating section: temperature controlled at 850-900°C, heating time 30-60 min; first heating section: temperature controlled at 1010-1050°C, heating time 50-75 min; second heating section: temperature controlled at 1265-1285°C, heating time 70-100 min; soaking section: temperature controlled at 1270-1280°C, heating time 60-90 min; high-temperature section includes the second heating section and the soaking section, with a temperature of 130-190 min, for a total heating time of 210-325 min.

[0012] 2) High-pressure water descaling: Preliminary cleaning is achieved by spraying high-pressure water vapor to impact the oxide scale on the surface of the stainless steel composite plate.

[0013] 3) Slab rough rolling: The heated slab is conveyed to the rough rolling mill via transfer rollers. The conveying device is equipped with a corresponding heat preservation cover. The rough rolling process involves 5 passes. Between the first and second passes, a corresponding oxide scale removal device is installed to reduce the occurrence of warping defects when rolling stainless steel composite plates. The reduction rate for the first pass is 23-25%; the reduction rate for the second pass is 16-19%; the reduction rate for the third pass is 20-22%; the reduction rate for the fourth pass is 21-23%; and the reduction rate for the fifth pass is 16-20%.

[0014] 4) Hot-rolling stainless steel sheet: The head and tail of the stainless steel sheet are replaced by a process of first rolling and then unrolling.

[0015] 5) Use a flying shear to cut off the ends of the stainless steel sheet.

[0016] 6) Slab Finish Rolling: After rough rolling, the slab is conveyed to the finishing rolling mill for finishing rolling. Finish rolling employs a speed-increasing rolling process. The initial finishing rolling temperature is set at 1070-1090°C; the final finishing rolling temperature is >900°C.

[0017] 7) After cooling, perform curling and transfer.

[0018] Step 3) The slab roughing mill oxide scale removal device includes a vibration mechanism, a cleaning mechanism, and a roll cleaning mechanism. The vibration mechanism, cleaning mechanism, and roll cleaning mechanism are set between two adjacent hot rolling mill units. The cleaning mechanism is set between the vibration mechanism and the roll cleaning mechanism. During the transmission of the stainless steel composite plate, the vibration mechanism hammers and vibrates the stainless steel composite plate to loosen the attached oxide scale. Then, the cleaning mechanism cleans the oxide scale on the surface of the stainless steel composite plate. Finally, the roll cleaning mechanism cleans the oxide scale residue adhering to the surface of the rolls to ensure the cleanliness of the roll surface.

[0019] The vibration mechanism includes a first frame, a vibration frame, a toggle shaft, a first limiting plate, and a fourth motor. The first limiting plate is fixedly connected to the first frame. The vibration frame is provided with a first guide shaft, which is inserted into the first limiting plate and can slide against it. A first spring is sleeved on the first guide shaft, and the first spring contacts the first limiting plate and the vibration frame. A horizontal shaft is provided at the end of the first guide shaft. The toggle shaft is located diagonally above the horizontal shaft. Both ends of the toggle shaft are rotatably connected to the first frame. A sprocket is provided at the end of the toggle shaft. A toggle rod is provided on the toggle shaft and located on one side of the end of the horizontal shaft. The fourth motor is fixed to the first frame by a motor base. The fourth motor is provided with a sprocket and connected to the sprocket at the end of the toggle shaft by a chain.

[0020] The cleaning mechanism includes a second frame and a cleaning mechanism. A pair of cleaning mechanisms are symmetrically arranged on the second frame. Each cleaning mechanism includes a scraper and a baffle. One end of the scraper has a first rotating shaft that is hinged to the second frame. A pair of baffles are fixed to both ends of the scraper. Each baffle has a hinged connecting screw. A fixing plate is located above the baffle and is fixedly connected to the second frame. The fixing plate has a through groove, and a fixing block is located within the through groove. A second rotating shaft is located on the fixing block and rotatably connected to the fixing plate. The screw passes through the fixing block, and the screw and the fixing block are slidably connected through a through hole. A nut is located on the screw. A second spring is sleeved on the screw, and the second spring contacts the fixing block and the top plate at the bottom end of the screw.

[0021] The upper cleaning mechanism is equipped with a pushing mechanism, which uses the commonly used conveyor belt technology in the prior art. It includes a conveyor belt, a conveyor shaft, and a first motor connected to the conveyor shaft and providing conveying power. A baffle is rotatably connected to the end of the conveyor shaft, and a toggle plate is provided on the conveyor belt to facilitate pushing and conveying.

[0022] A conveying mechanism is provided on the cleaning mechanism located above. The conveying mechanism is located on one side of the cleaning mechanism and is fixedly connected to the second frame. The conveying mechanism includes a conveying box and a conveying cable chain located inside the conveying box. The conveying cable chain includes a cable chain, a drive shaft, and a second motor. The application of the conveying cable chain here is a mature existing technology. The second motor provides power to the drive shaft so that the cable chain is driven by the gears on the drive shaft. The end of the drive shaft is rotatably connected to the conveying box, and a cam is provided on the drive shaft.

[0023] The conveying mechanism is equipped with a crushing mechanism above it, including a second limiting plate, a crushing rack, a crushing cutter head, and a through shaft; the second limiting plate is fixedly connected to the second frame, the crushing rack is equipped with a second guide shaft and a limiting screw, the second guide shaft and the limiting screw are slidably connected to the second limiting plate, the second guide shaft is equipped with a sleeved third spring, and the limiting screw is equipped with a fastening nut; a push rod is provided on one side of the crushing rack, and the push rod contacts a cam.

[0024] The shredder head is movably connected to the shredder frame; the shredder head is provided with an installation groove, and a second limiting block is provided in the installation groove; the bottom end of the shredder frame is provided with a first limiting block, which is located in the installation groove; the through shaft passes through the shredder frame, the first limiting block, the second limiting block, and the shredder head and can slide; both ends of the through shaft are provided with threads and nuts for fixing after the connection is completed, so that the through shaft and the shredder head become one piece; a fourth spring is provided on the through shaft, and the fourth spring is located between the first limiting block and the second limiting block.

[0025] The cleaning roller mechanism includes a third frame, a mounting plate, a third motor, cleaning roller plates, and a crankshaft. The mounting plate is mounted on the third frame and has a movable groove. A pair of cleaning roller plates are arranged vertically, with fixed support plates at both ends, which are slidably connected to the mounting plate. One end of the cleaning roller plate has a hinged control plate, which is located within the movable groove. The third motor is fixed to the mounting plate via a motor mount, and a crankshaft is located at the end of the motor shaft, rotatably connecting to one end of the control plate. The cleaning roller plate has serrations that contact the rolls on the hot rolling mill. Below the cleaning roller plate is a receiving box fixedly connected to the mounting plate for collecting and uniformly processing the cleaned oxide scale.

[0026] The advantages of this invention compared to existing technologies are as follows:

[0027] 1) During the rolling and transmission of stainless steel composite plates, before entering the next hot rolling mill, the stainless steel composite plates are hammered and vibrated by a vibration mechanism to loosen the attached oxide scale. Then, the oxide scale on the surface of the stainless steel composite plates is cleaned by a cleaning mechanism. Finally, the oxide scale residue adhering to the surface of the rolls is cleaned by a roll cleaning mechanism to ensure the cleanliness of the roll surface.

[0028] In the vibration mechanism, the fourth motor drives the actuating shaft to rotate, which in turn drives the actuating rod to rotate and push the horizontal shaft, causing the horizontal shaft to pull the first guide shaft and the vibration frame to rise. As the actuating rod continues to rotate, it will disengage from the horizontal shaft when it reaches a certain height. At this time, the first spring pushes the vibration frame to quickly push out and reset to strike the stainless steel composite plate, generating vibration. As the water is continuously struck, continuous vibration is generated, which can loosen the firmly attached oxide scale, so that the subsequent cleaning mechanism can clean the oxide scale.

[0029] 2) During the oxide scale removal process, the oxide scale is scraped off by the cleaning mechanism. In the upper cleaning mechanism, a second spring pushes a baffle to make the scraper contact the stainless steel composite plate. The second spring can push the scraper to adapt to the thickness of the stainless steel composite plate so that it fits tightly against the surface. During the transfer of the stainless steel composite plate, the oxide scale can be quickly collected by the scraper and baffle. Then, the transfer process of the oxide scale is accelerated by the pushing mechanism. After the oxide scale enters the conveying mechanism, it is transferred. Furthermore, the oxide scale can be crushed by the crushing mechanism during the transfer process to make the transfer process smoother. In the lower cleaning mechanism, the oxide scale is scraped off by the scraper. The oxide scale is collected and processed after falling off.

[0030] In the feeding mechanism, the first motor drives the conveyor belt, and the actuating plate moves the oxide scale on the scraper to quickly convey it into the conveyor box, avoiding the accumulation of oxide scale on the inclined scraper. After the oxide scale enters the conveyor box, it falls onto the conveyor chain in the conveying mechanism. The second motor drives the conveyor chain to quickly transfer the oxide scale, preventing it from accumulating and falling onto the slab. During the transfer of oxide scale, the cam rotates and pushes the push rod to drive the crushing rack to rise along the second guide shaft. The top block in the missing part of the cam is pushed by the third spring to quickly reset, so that the crushing cutter head breaks the oxide scale on the conveyor chain. This allows the oxide scale to be reduced in size and then smoothly transferred on the conveyor chain without friction or jamming with the inner wall of the conveyor box.

[0031] 3) Furthermore, during the above-mentioned crushing and conveying process, the conveying process continues when the crushing cutter head touches the conveyor chain. This effectively prevents the oxide scale from being pressed down by the crushing cutter head and unable to be conveyed. In this setting, the crushing cutter head is movably connected to the crushing frame. Therefore, when the crushing cutter head touches the conveyor chain, it will drive the crushing cutter head and the conveyor chain to move synchronously according to the friction force. When the cam rotates and lifts the push rod, it drives the crushing frame and the crushing cutter head to disengage from the conveyor chain. The crushing cutter head is quickly reset under the push of the fourth spring to prepare for the next crushing, avoiding inconvenience to the normal transfer of oxide scale, which would otherwise cause the oxide scale to accumulate due to untimely transfer.

[0032] Finally, the cleaning roller plate in the cleaning roller mechanism is driven by the third motor to rotate the crankshaft, which in turn pulls the control plate to move. The crankshaft and the control plate drive the upper and lower cleaning roller plates to slide back and forth. At the same time, the saw teeth are set to work with the left and right sliding of the cleaning roller plate to form a cutting force. With the rotation of the roller, not only is scraping achieved, but also oblique cutting is achieved. This reduces the difficulty of cleaning the stubborn oxide scale adhering to the roller and improves the cleaning effect. Attached Figure Description

[0033] Appendix Figure 1 This is a schematic diagram of the structure of the oxide scale cleaning device in step 3) of the process for eliminating warping and surface defects in hot-rolled stainless steel composite strip. Figure 1 ;

[0034] Appendix Figure 2 This is a schematic diagram of the structure of the oxide scale cleaning device in step 3) of the process for eliminating warping and surface defects in hot-rolled stainless steel composite strip. Figure 2 ;

[0035] Appendix Figure 3 This is a schematic diagram of the structure of the oxide scale cleaning device in step 3) of the process for eliminating warping and surface defects in hot-rolled stainless steel composite strip. Figure 3 ;

[0036] Appendix Figure 4This is a schematic diagram of the cleaning roller mechanism. Figure 1 ;

[0037] Appendix Figure 5 This is a schematic diagram of the cleaning roller mechanism. Figure 2 ;

[0038] Appendix Figure 6 This is a schematic diagram of the cleaning mechanism;

[0039] Appendix Figure 7 This is a schematic diagram of the feeding mechanism;

[0040] Appendix Figure 8 This is a schematic diagram of the vibration mechanism;

[0041] Appendix Figure 9 This is a structural diagram of the crushing mechanism and the conveying mechanism;

[0042] Appendix Figure 10 This is a structural diagram of the shredder and shredder head;

[0043] Appendix Figure 11 This is a schematic diagram of the transmission mechanism;

[0044] In the diagram: 1. Vibration mechanism; 11. First frame; 12. Vibration frame; 13. First guide shaft; 131. First spring; 14. Horizontal shaft; 15. Actuating shaft; 151. Actuating rod; 16. First limiting plate; 17. Fourth motor;

[0045] 2. Cleaning mechanism; 21. Second frame; 22. Removal mechanism; 221. Scraper; 222. Baffle; 223. First rotating shaft; 224. Fixing plate; 225. Screw; 226. Second spring; 227. Fixing block; 2271. Second rotating shaft;

[0046] 23. Pushing mechanism; 231. First motor; 232. Actuating plate;

[0047] 24. Conveying mechanism; 241. Conveying box; 242. Conveying cable chain; 243. Cam; 244. Drive shaft; 245. Second motor;

[0048] 25. Crushing mechanism; 251. Second limiting plate; 252. Crushing rack; 2521. Third spring; 2522. Second guide shaft; 2523. Limiting screw; 2524. Top rod; 2525. First limiting block;

[0049] 253. Crusher head; 2531. Mounting slot; 2532. Second limit block;

[0050] 254, Through shaft; 2541, Fourth spring;

[0051] 3. Cleaning roller mechanism; 31. Third frame; 311. Mounting plate; 312. Movable groove; 32. Third motor; 33. Cleaning roller plate; 331. Sawtooth; 332. Support plate; 333. Control plate; 34. Crankshaft; 35. Receiving box;

[0052] 4. Rolls; 5. Stainless steel composite plate. Detailed Implementation

[0053] To facilitate understanding by those skilled in the art, the following is a detailed explanation in conjunction with the appendix. Figure 1-11 The technical solution of the present invention will be further described in detail below.

[0054] Example 1 uses a double-sided composite panel as the material, with the substrate being 304 stainless steel and the cladding being Q345 low-carbon steel.

[0055] A process for eliminating warping and surface defects in hot-rolled stainless steel composite strips, comprising the following steps:

[0056] 1) Slab heating: The heating process consists of a preheating section, a first heating section, a second heating section, and a soaking section. The preheating section is controlled at 900°C for 60 minutes; the first heating section is controlled at 1050°C for 75 minutes; the second heating section is controlled at 1280°C for 100 minutes; and the soaking section is controlled at 1280°C for 90 minutes. The total heating time is 315 minutes.

[0057] 2) High-pressure water descaling: Preliminary cleaning is achieved by spraying high-pressure water vapor to impact the oxide scale on the surface of the stainless steel composite plate.

[0058] 3) Slab rough rolling: The heated slab is conveyed to the rough rolling mill via transfer rollers. The transfer device is equipped with a corresponding heat preservation cover. The rough rolling process involves 5 passes. Between the first and second passes, a corresponding oxide scale removal device is provided to reduce the occurrence of warping defects when rolling stainless steel composite plates. The reduction rate for the first pass is 25%; the reduction rate for the second pass is 19%; the reduction rate for the third pass is 22%; the reduction rate for the fourth pass is 23%; and the reduction rate for the fifth pass is 20%.

[0059] 4) Hot-rolling stainless steel sheet: The head and tail of the stainless steel sheet are replaced by a process of first rolling and then unrolling.

[0060] 5) Use a flying shear to cut off the ends of the stainless steel sheet.

[0061] 6) Slab Finish Rolling: After rough rolling, the slab is conveyed to the finishing rolling mill for finishing rolling. Finish rolling employs a speed-increasing rolling process. The starting temperature for finishing rolling is set at 1090°C; the ending temperature for finishing rolling is 1000°C.

[0062] 7) After cooling, perform curling and transfer.

[0063] Step 3) The slab roughing mill oxide scale removal device includes a vibration mechanism 1, a cleaning mechanism 2, and a cleaning roll mechanism 3. The vibration mechanism 1, cleaning mechanism 2, and cleaning roll mechanism 3 are set between two adjacent hot rolling mill units. The cleaning mechanism 2 is set between the vibration mechanism 1 and the cleaning roll mechanism 3. During the transmission of the stainless steel composite plate 5, the vibration mechanism 1 hammers and vibrates the stainless steel composite plate 5 to loosen the attached oxide scale. Then, the cleaning mechanism 2 cleans the oxide scale on the surface of the stainless steel composite plate 5. Finally, the cleaning roll mechanism 3 cleans the oxide scale residue adhering to the surface of the roll 4 to ensure the cleanliness of the surface of the roll 4.

[0064] The vibration mechanism 1 includes a first frame 11, a vibration frame 12, a toggle shaft 15, a first limiting plate 16, and a fourth motor 17. The first limiting plate 16 is fixedly connected to the first frame 11. The vibration frame 12 is provided with a first guide shaft 13, which is inserted into the first limiting plate 16 and can slide against it. The first guide shaft 13 is provided with a sleeved first spring 131, which abuts against the first limiting plate 16 and the vibration frame 12. The end of the first guide shaft 13 is provided with a horizontal shaft 14. The toggle shaft 15 is located diagonally above the horizontal shaft 14. Both ends of the toggle shaft 15 are rotatably connected to the first frame 11. The end of the toggle shaft 15 is provided with a sprocket. The toggle shaft 15 is provided with a toggle rod 151, which is located on one side of the end of the horizontal shaft 14. The fourth motor 17 is fixed to the first frame 11 by a motor base. The fourth motor 17 is provided with a sprocket and is connected to the sprocket at the end of the toggle shaft 15 by a chain.

[0065] The cleaning mechanism 2 includes a second frame 21 and a cleaning mechanism 22. A pair of cleaning mechanisms 22 are symmetrically arranged on the second frame 21. Each cleaning mechanism 22 includes a scraper 221 and a baffle 222. One end of the scraper 221 is provided with a first rotating shaft 223 and hinged to the second frame 21. A pair of baffles 222 are provided and respectively fixed to both ends of the scraper 221. Hinged connecting screws 225 are provided on each baffle 222. A fixing plate 224 is provided above the baffle 222. A second frame 21 is fixedly connected. A through groove is provided on the fixing plate 224, and a fixing block 227 is provided in the through groove. A second rotating shaft 2271 is provided on the fixing block 227 and is rotatably connected to the fixing plate 224. The screw 225 passes through the fixing block 227, and the screw 225 and the fixing block 227 are slidably connected through a through hole. A nut is provided on the screw 225. A second spring 226 is sleeved on the screw 225, and the second spring 226 abuts against the top plate of the fixing block 227 and the bottom end of the screw 225.

[0066] The upper cleaning mechanism 22 is equipped with a pushing mechanism 23. The pushing mechanism 23 uses the commonly used conveyor belt technology in the prior art for material conveying. It includes a conveyor belt, a conveyor shaft, and a first motor 231 connected to the conveyor shaft and providing conveying power. A baffle 222 is rotatably connected to the end of the conveyor shaft, and a toggle plate 232 is provided on the conveyor belt to facilitate material pushing and conveying.

[0067] A conveying mechanism 24 is provided on the cleaning mechanism 22 located above. The conveying mechanism 24 is located on one side of the cleaning mechanism 22 and is fixedly connected to the second frame 21. The conveying mechanism 24 includes a conveying box 241 and a conveying cable chain 242 disposed in the conveying box 241. The conveying cable chain 242 includes a cable chain, a drive shaft 244, and a second motor 245. The application of the conveying cable chain here is a mature existing technology. The second motor 245 provides power to the drive shaft 244 so that the cable chain is driven and transmitted by the gears on the drive shaft 244. The end of the drive shaft 244 is rotatably connected to the conveying box 241, and a cam 243 is provided on the drive shaft 244.

[0068] Above the conveying mechanism 24 is a crushing mechanism 25, including a second limiting plate 251, a crushing rack 252, a crushing cutter head 253, and a through shaft 254; the second limiting plate 251 is fixedly connected to the second frame 21, the crushing rack 252 is provided with a second guide shaft 2522 and a limiting screw 2523, the second guide shaft 2522 and the limiting screw 2523 are slidably connected to the second limiting plate 251, the second guide shaft 2522 is provided with a sleeved third spring 2521, and the limiting screw 2523 is provided with a fastening nut; a push rod 2524 is provided on one side of the crushing rack 252, and the push rod 2524 contacts the cam 243.

[0069] The shredder head 253 is movably connected to the shredder frame 252; the shredder head 253 is provided with an installation groove 2531, and a second limiting block 2532 is provided in the installation groove 2531; the bottom end of the shredder frame 252 is provided with a first limiting block 2525, which is located in the installation groove 2531; the through shaft 254 passes through the shredder frame 252, the first limiting block 2525, the second limiting block 2532, and the shredder head 253 and can slide; both ends of the through shaft 254 are provided with threads and nuts for fixing after the connection is completed, so that the through shaft 254 and the shredder head 253 become one piece; the through shaft 254 is provided with a sleeved fourth spring 2541, which is located between the first limiting block 2525 and the second limiting block 2532.

[0070] The cleaning roller mechanism 3 includes a third frame 31, a mounting plate 311, a third motor 32, a cleaning roller plate 33, and a crankshaft 34. The mounting plate 311 is mounted on the third frame 31 and has a movable groove 312. The cleaning roller plate 33 is provided in pairs and arranged vertically. Both ends of the cleaning roller plate 33 are provided with fixedly connected support plates 332, which are slidably connected to the mounting plate 311. One end of the cleaning roller plate 33 is provided with a hinged control plate 333, which is located in the movable groove 312. The third motor 32 is fixed to the mounting plate 311 by a motor base. The shaft end of the third motor 32 is provided with a crankshaft 34, which is rotatably connected to one end of the control plate 333. The cleaning roller plate 33 has serrations 331 that touch the roller 4 on the hot rolling mill. Below the cleaning roller plate, there is a receiving box 35 fixedly connected to the mounting plate 311 for collecting and uniformly processing the cleaned oxide scale.

[0071] Example 2:

[0072] The difference compared to Example 1 is:

[0073] Step 1) Slab heating: Preheating section, temperature controlled at 850°C, heating time 30min; Heating section 1, temperature controlled at 1010°C, heating time 50min; Heating section 2, temperature controlled at 1265°C, heating time 70min; Soaking section, temperature controlled at 1270°C, heating time 60min.

[0074] Step 3) Slab rough rolling: The heated slab is conveyed to the rough rolling mill via transfer rollers. The transfer device is equipped with a corresponding heat preservation cover. The rough rolling process involves 5 passes. Between the first and second passes, a corresponding oxide scale removal device is provided to reduce the occurrence of warping defects when rolling stainless steel composite plates. The reduction rate for the first pass is 23%; the reduction rate for the second pass is 16%; the reduction rate for the third pass is 20%; the reduction rate for the fourth pass is 21%; and the reduction rate for the fifth pass is 16%.

[0075] Example 3:

[0076] The difference compared to Example 1 is:

[0077] Step 1) Slab heating: Preheating section, temperature controlled at 880°C, heating time 50min; Heating section 1, temperature controlled at 1035°C, heating time 60min; Heating section 2, temperature controlled at 1270°C, heating time 80min; Soaking section, temperature controlled at 1275°C, heating time 80min.

[0078] Step 3) Slab rough rolling: The heated slab is conveyed to the rough rolling mill via transfer rollers. The conveying device is equipped with a corresponding heat preservation cover. The rough rolling process involves 5 passes. Between the first and second passes, a corresponding oxide scale removal device is provided to reduce the occurrence of warping defects when rolling stainless steel composite plates. The reduction rate for the first pass is 24%; the reduction rate for the second pass is 17%; the reduction rate for the third pass is 21%; the reduction rate for the fourth pass is 22%; and the reduction rate for the fifth pass is 18%.

[0079] Comparative Example 1:

[0080] The difference from Example 1 is that in step 3) of Comparative Example 1, no corresponding oxide scale removal device, including a vibration mechanism, a cleaning mechanism, and a cleaning roll mechanism, was installed between the first and second rolling passes.

[0081] Comparative Example 2:

[0082] The difference from Example 2 is that in step 3) of Comparative Example 1, no corresponding oxide scale removal device, including vibration mechanism, cleaning mechanism, and cleaning roll mechanism, was set up between the first and second rolling passes.

[0083] Test Example 1:

[0084] The specific steps are as follows:

[0085] 1) Slab heating: The heating process consists of a preheating section, a first heating section, a second heating section, and a soaking section. The preheating section is controlled at 800°C for 25 minutes; the first heating section is controlled at 900°C for 40 minutes; the second heating section is controlled at 1150°C for 50 minutes; and the soaking section is controlled at 1160°C for 45 minutes. The total heating time is 160 minutes.

[0086] 2) High-pressure water descaling: Preliminary cleaning is achieved by spraying high-pressure water vapor to impact the oxide scale on the surface of the stainless steel composite plate.

[0087] 3) Slab roughing: The heated slab is conveyed to the roughing mill by the conveyor rollers. The conveyor is equipped with a corresponding heat preservation cover. The roughing mill is rolled in 5 passes. The reduction rate of the first pass is 20%; the reduction rate of the second pass is 15%; the reduction rate of the third pass is 18%; the reduction rate of the fourth pass is 19%; and the reduction rate of the fifth pass is 13%.

[0088] 4) Hot-rolling stainless steel sheet: The head and tail of the stainless steel sheet are replaced by a process of first rolling and then unrolling.

[0089] 5) Use a flying shear to cut off the ends of the stainless steel sheet.

[0090] 6) Slab Finish Rolling: After rough rolling, the slab is conveyed to the finishing rolling mill for finishing rolling. Finish rolling employs a speed-increasing rolling process, with the starting temperature set at 870°C and the ending temperature at 780°C.

[0091] 7) After cooling, perform curling and transfer.

[0092] Test Example 2:

[0093] The specific steps are as follows:

[0094] 1) Slab heating: The heating process consists of a preheating section, a first heating section, a second heating section, and a soaking section. The preheating section is controlled at 1000°C for 70 minutes; the first heating section is controlled at 1150°C for 80 minutes; the second heating section is controlled at 1310°C for 110 minutes; and the soaking section is controlled at 1320°C for 100 minutes. The total heating time is 360 minutes.

[0095] 2) High-pressure water descaling: Preliminary cleaning is achieved by spraying high-pressure water vapor to impact the oxide scale on the surface of the stainless steel composite plate.

[0096] 3) Slab roughing: The heated slab is conveyed to the roughing mill via conveyor rollers. The conveyor is equipped with a corresponding heat preservation cover. The roughing mill performs 5 passes, with a reduction rate of 26.5% for the first pass, 21% for the second pass, 23% for the third pass, 25% for the fourth pass, and 22.5% for the fifth pass.

[0097] 4) Hot-rolling stainless steel sheet: The head and tail of the stainless steel sheet are replaced by a process of first rolling and then unrolling.

[0098] 5) Use a flying shear to cut off the ends of the stainless steel sheet.

[0099] 6) Slab finishing rolling: After rough rolling, the slab is transferred to the finishing rolling mechanism for finishing rolling. The finishing rolling adopts speed-increasing rolling. The starting temperature of finishing rolling is set at 1150°C; the ending temperature of finishing rolling is 1090°C.

[0100] 7) After cooling, perform curling and transfer.

[0101] Mechanical properties were tested according to GB / T 8165-2008, and the test results are shown in the table below:

[0102] Tensile strength MPa Elongation strength MPa Elongation after fracture % in conclusion Defective feature: Upturned button head (visual inspection) Example 1 482 290 51 qualified This defect does not exist. Example 2 479 287 55 qualified This defect does not exist. Example 3 469 265 53.5 qualified This defect does not exist. Comparative Example 1 481 280 52 qualified Slightly upturned head Comparative Example 2 490 278 52.8 qualified slight knock Test Example 1 376 215 39 Unqualified The discount was obvious. Test Example 2 382 225 37.5 Unqualified The discount was obvious.

[0103] In summary: In Examples 1-3 above, the numerical parameters were implemented according to the process specifications for plate rolling, and in step 3), relevant oxide scale removal devices, namely vibration mechanism, cleaning mechanism, and cleaning roll mechanism, were set up and used. In Comparative Examples 1-2, the numerical parameters were implemented according to the process specifications for plate rolling, but no relevant oxide scale removal devices were set up and used in step 3). In Test Example 1, the numerical values ​​were lower than the process specifications for plate rolling, and in Test Example 2, the numerical values ​​were higher than the process specifications for plate rolling. In Test Examples 1 and 2, no relevant oxide scale removal devices were set up and used in step 3).

[0104] By comparing Examples 1-3, Comparative Examples 1-2, and Test Examples 1-2, it was found that the composite plates rolled in Examples 1-3 and Comparative Examples 1-2 all met the production requirements in terms of mechanical properties and the experimental data were relatively stable; however, the composite plates rolled in Test Examples 1-2 did not meet the production requirements in terms of mechanical properties.

[0105] Secondly, compared with Examples 1-3, Comparative Examples 1-2 did not use the relevant oxide scale cleaning device in step 3). At the same time, the experimental results showed that the surface of the plates produced by Comparative Examples 1-2 had slight defects such as buckling and warping after visual inspection, indicating that the oxide scale cleaning device in step 3) has the ability and function to reduce the warping defects of stainless steel plates.

[0106] Compared with Examples 1-3 and Comparative Examples 1-2, Test Examples 1-2 not only failed to meet the mechanical performance standards, but also had obvious drawbacks such as the buckle curling.

[0107] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0108] In summary, the electronic or electrical components, including but not limited to motors, are existing components that are custom-made or purchased. The electrical connections between these components are conventional circuit or electrical connections in the prior art and are not within the scope of protection of this invention.

[0109] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A process for eliminating the defects of buckling head and surface of hot-rolled stainless steel clad strip, characterized in that The specific steps are as follows: 1) slab heating: the heating step is preheating section, heating section one, heating section two, soaking section; the preheating section is controlled at 850-900°C, the heating time is 30-60 min; the heating section one is controlled at 1010-1050°C, the heating time is 50-75 min; the heating section two is controlled at 1265-1285°C, the heating time is 70-100 min; the soaking section is controlled at 1270-1280°C, the heating time is 60-90 min; the total heating time is 210-325 min; 2) high-pressure water descaling: the preliminary cleaning is realized by spraying high-pressure water vapor to impact the surface scale of the stainless steel clad plate; 3) slab rough rolling: the heated slab is conveyed to the rough rolling mill through the conveying device, and the conveying device is provided with a corresponding heat preservation cover; the scale cleaning device is arranged between the first pass and the second pass during rough rolling to reduce the occurrence of the buckling head defect during rolling of the stainless steel clad plate; the one-pass reduction rate is 23-25%; the two-pass reduction rate is 16-19%; the three-pass reduction rate is 20-22%; the four-pass reduction rate is 21-23%; and the five-pass reduction rate is 16-20%; 4) hot coil box coiling of the stainless steel clad plate: the head and tail replacement of the stainless steel clad plate is realized through the process of coiling first and then uncoiling; 5) flying shear cutting of the head and tail of the stainless steel clad plate; 6) slab finishing rolling: the slab is conveyed into the finishing rolling mechanism after rough rolling, and the finishing rolling adopts speed-up rolling; the finishing rolling opening rolling temperature is set to 1070-1090°C; and the finishing rolling end temperature is greater than 900°C; 7) cooling and coiling transfer after cooling; The scale cleaning device in the step 3) slab rough rolling includes a vibrating mechanism, a cleaning mechanism and a cleaning roller mechanism, and the vibrating mechanism, the cleaning mechanism and the cleaning roller mechanism are arranged between two adjacent groups of rough rolling mills; the cleaning mechanism is arranged between the vibrating mechanism and the cleaning roller mechanism; in the conveying process of the stainless steel clad plate, the vibrating mechanism is used for hammering and vibrating the stainless steel clad plate to loosen the adhered scale, then the cleaning mechanism is used for cleaning the scale on the surface of the stainless steel clad plate, and finally the cleaning roller mechanism is used for cleaning the scale and dregs adhered to the surface of the roller to ensure the cleanliness of the surface of the roller; The vibrating mechanism includes a first rack, a vibrating frame, a shifting shaft, a first limiting plate and a fourth motor; the first limiting plate is fixedly connected with the first rack; the vibrating frame is provided with a first guide shaft, the first guide shaft is inserted into the first limiting plate and can slide relative to each other, the first guide shaft is provided with a sleeved first spring, and the first spring abuts against the first limiting plate and the vibrating frame; the first guide shaft is provided with a horizontal shaft at the end portion; the shifting shaft is arranged obliquely above the horizontal shaft, the shifting shaft is rotatably connected with the first rack at both ends, the shifting shaft is provided with a sprocket at the end portion; the shifting shaft is provided with a shifting rod, and the shifting rod is arranged at one side of the end portion of the horizontal shaft; the fourth motor is fixed on the first rack through a motor base, the fourth motor is provided with a sprocket, and the sprocket is connected with the end portion sprocket of the shifting shaft through a chain.

2. A process for eliminating the defects of the bucked head and surface of the hot rolled stainless steel clad strip as claimed in claim 1 wherein The cleaning mechanism comprises a second rack, a cleaning mechanism; the cleaning mechanism is provided with a pair of symmetrically arranged on the second rack, the cleaning mechanism comprises a scraper, a baffle; the scraper is provided with a first rotating shaft at one end and is hinged to the second rack, the baffle is provided with a pair of and is respectively fixed at both ends of the scraper, the baffle is hinged with a screw rod, the upper side of the baffle is provided with a fixed plate, the fixed plate is fixedly connected with the second rack, the fixed plate is provided with a through slot, the through slot is provided with a fixed block, the fixed block is provided with a second rotating shaft and is rotatably connected with the fixed plate; the screw rod passes through the fixed block, the screw rod and the fixed block are slidably connected through the through hole; the screw rod is provided with a nut; the screw rod is provided with a sleeved second spring, the second spring abuts against the fixed block and the top plate at the bottom end of the screw rod.

3. A process for eliminating the defects of the buckling head and surface of the hot-rolled stainless steel clad strip as claimed in claim 2, wherein The cleaning mechanism arranged above is provided with a pushing mechanism, the pushing mechanism comprises a conveying belt, a conveying shaft and a first motor connected with the conveying shaft and providing conveying power, the conveying shaft is rotatably connected with the baffle at the end, the conveying belt is provided with a pushing plate to facilitate the pushing and conveying.

4. A process for eliminating the defects of the buckling head and surface of the hot-rolled stainless steel clad strip as claimed in claim 2, wherein The cleaning mechanism arranged above is provided with a conveying mechanism, the conveying mechanism is arranged on one side of the cleaning mechanism and is fixedly connected with the second rack; the conveying mechanism comprises a conveying box and a conveying drag chain arranged in the conveying box, the conveying drag chain comprises a drag chain, a transmission shaft and a second motor, the second motor provides power for the transmission shaft to drive the drag chain to be transmitted by the gear on the transmission shaft; The transmission shaft is rotatably connected with the conveying box at the end, and the transmission shaft is provided with a cam.

5. A process for eliminating the defects of the buckling head and surface of the hot-rolled stainless steel clad strip as claimed in claim 4, wherein The conveying mechanism is provided with a crushed material mechanism above, comprising a second limiting plate, a crushed material frame, a crushed material cutter head, a through shaft; the second limiting plate is fixedly connected with the second rack, the crushed material frame is provided with a second guide shaft and a limiting screw rod, the second guide shaft and the limiting screw rod are slidably connected with the second limiting plate, the second guide shaft is provided with a sleeved third spring, and the limiting screw rod is provided with a fastening nut; one side of the crushed material frame is provided with a jacking rod, and the jacking rod abuts against the cam.

6. A process for eliminating the defects of the buckling head and surface of the hot-rolled stainless steel clad strip as claimed in claim 5 wherein The crushed material cutter head is movably connected with the crushed material frame; the crushed material cutter head is provided with a mounting groove, and the mounting groove is provided with a second limiting block; the bottom end of the crushed material frame is provided with a first limiting block, and the first limiting block is arranged in the mounting groove; the through shaft penetrates the crushed material frame, the first limiting block, the second limiting block and the crushed material cutter head and can slide, the both ends of the through shaft are provided with threads and are provided with nuts to complete the fixation after penetration, so that the through shaft and the crushed material cutter head become an integral whole; the through shaft is provided with a sleeved fourth spring, and the fourth spring is arranged between the first limiting block and the second limiting block.

7. A process for eliminating the defects of the buckling head and surface of the hot-rolled stainless steel clad strip as claimed in claim 1 wherein The cleaning roller mechanism comprises a third rack, a mounting plate, a third motor, a cleaning roller plate, and a crankshaft; the mounting plate is arranged on the third rack, and the mounting plate is provided with a movable groove; the cleaning roller plate is arranged in pairs and is arranged above and below, and the both ends of the cleaning roller plate are provided with fixedly connected support plates which are slidably connected with the mounting plate; one end of the cleaning roller plate is provided with a hinged control plate, and one end of the control plate is arranged in the movable groove; the third motor is fixed on the mounting plate through a motor base, and the crankshaft is arranged at the shaft end of the third motor and rotatably connected with one end of the control plate; the cleaning roller plate is provided with a sawtooth and abuts against the roll of the roughing mill; the lower side of the cleaning roller plate is provided with a material receiving box fixedly connected with the mounting plate for collecting and uniformly processing the cleaned scale.

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