Process for eliminating warping, buckling and surface defects in rolling of hot-rolled stainless steel composite plate strip

Abstract

The invention discloses a process for eliminating warping, buckling and surface defects in rolling of a hot-rolled stainless steel composite plate strip. The process comprises the following specific steps: 1) heating a plate blank; 2) removing phosphorus with high-pressure water; (3) rough rolling of the plate blank: rough rolling of the plate blank: the heated plate blank is conveyed to a rough rolling machine through a conveying roller, and a conveying device is provided with a corresponding heat preservation cover; five-pass rolling is carried out in rough rolling, and a corresponding oxide skin cleaning device is arranged between the first-pass rolling and the second-pass rolling so as to reduce the defect of warping when the stainless steel composite plate is rolled; 4) coiling the stainless steel plate by a hot coiling box; 5) shearing the head and the tail of the stainless steel plate; (6) plate blank finish rolling; and (7) after cooling, curling and transferring are conducted. On the basis of the rolling technology, oxide skin attached to the stainless steel composite plate and the surface layer of the roller can be further removed through the vibration mechanism, the cleaning mechanism and the roller cleaning mechanism in the oxide skin cleaning device, the surface friction force of the roller is effectively reduced, and it is guaranteed that the temperatures of the upper layer and the lower layer of the stainless steel composite plate are consistent.

Description

Technical Field

[0001] The invention belongs to the technical field of stainless steel plate rolling, and in particular relates to a process for eliminating buckled heads and surface defects in hot-rolled stainless steel composite plate strips. Background Art

[0002] Stainless steel composite plate is made of carbon steel base and stainless steel cladding. The material and thickness can be freely combined to meet the needs of different users. Stainless steel composite plate not only has the corrosion resistance of stainless steel, but also has the good mechanical strength and processing performance of carbon steel. It is now widely used in petroleum, chemical, salt, water conservancy and electricity industries. As a resource-saving product, stainless steel composite plate reduces the consumption of precious metals and greatly reduces the project cost. It achieves a perfect combination of low cost and high performance and has good social benefits.

[0003] In the rolling process of stainless steel composite plates and stainless steel plates, various rolling defects often occur, including the defect of buckle head. The slab is warped (warped head) or bent (buckled head) due to various reasons. The warped head makes the head of the steel plate easy to collide with the guard plate, guard plate or detection instrument. In severe cases, the strip steel cannot enter the rolling mill, causing steel pile accidents. The buckle head causes the steel plate to collide with the frame roller or roller table. In severe cases, the strip steel hits the flower rack on the roller table, causing the plate to drill under the roller table, which brings many disadvantages to production.

[0004] After searching, it was found that Yang Cheng, a technician in the hot-rolled strip steel plant of Wuhan Iron and Steel Corporation, had published a research paper titled "Analysis and Improvement of the Causes of Strip Head Warping (Buckling)", and its references included the Technical Operation Procedure B Standard of Wuhan Iron and Steel Corporation's hot-rolled strip steel plant and "Steel Rolling Technology" edited by Wang Tingpu of Northeast Polytechnic University. The paper clearly pointed out that the causes of strip steel rolling buckling include uneven heating temperature, inconsistent roll diameter, improper adjustment of wire binding height, residual iron oxide covering the slab, inconsistent roll roughness and friction coefficient, etc.

[0005] The temperature of the upper and lower surfaces of the slab is inconsistent, which makes the extension inconsistent after rolling, resulting in warping or bending, which is easy to be observed on the rolled products with larger cross-sections; the plate surface with residual iron oxide scale is prone to bend toward the side with oxide scale when rolling, because the residual oxide scale will cause slipping due to low rolling temperature. Secondly, the oxide scale on the roller will make the surface roughness of the roller inconsistent, so the extension of the roller rolling is inconsistent and the buckle head appears; for the above problems, corresponding oxide scale cleaning solutions can be adopted to reduce the probability of the disadvantage of rolling buckle head;

[0006] Further searching revealed that the prior art publication number is CN 116371916 A, which is a hot strip rolling production process for corrosion-resistant stainless steel carbon steel composite plates. The specific process steps are as follows: 1) surface treatment of substrate and cover plate; 2) assembly welding; 3) vacuuming of composite plate; 4) heating; 5) high-pressure water descaling: the oxide scale on the surface of the heated composite plate is removed by high-pressure water; 6) rough rolling: the composite plate is rolled 7 times during rough rolling; 7) descaling before finishing rolling, the oxide scale generated on the surface of the composite plate after rough rolling is removed by a descaling device; 8) finishing rolling: after transmission, it enters the finishing rolling mechanism, and the finishing rolling adopts increased speed rolling; 9) coiling: after finishing rolling, it is sent to the coiling mechanism for coiling. The present invention arranges a descaling device before finishing rolling, and while performing multi-stage descaling on the stainless steel carbon steel composite plate, it avoids the water flow and the cleaned oxide scale from staying on the surface of the stainless steel carbon steel composite plate for a long time; this scheme provides a stainless steel composite plate rolling process;

[0007] In combination with the above retrieved prior art, the present invention provides a process for eliminating buckles and surface defects in the rolling of hot-rolled stainless steel composite plate strips in view of rolling problems and solutions. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a process for eliminating the buckled heads and surface defects of hot-rolled stainless steel composite plate strips. On the basis of the rolling process, the oxide scale attached to the surface of the stainless steel composite plate and the roller can be further removed through the vibration mechanism, cleaning mechanism, and roller cleaning mechanism in the oxide scale cleaning device, thereby effectively reducing the friction force on the surface of the roller and ensuring that the temperature of the upper and lower surfaces of the stainless steel composite plate is consistent.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] A process for eliminating buckled heads and surface defects in hot-rolled stainless steel composite plate strips, the specific steps are as follows:

[0011] 1) Slab heating: The heating steps are preheating section, heating section one, heating section two, and soaking section; the heating steps are divided into preheating section, heating section one, heating section two, and soaking section; in the preheating section, the temperature is controlled at 850-900°C, and the heating time is 30-60min; in the heating section one, the temperature is controlled at 1010-1050°C, and the heating time is 50-75min; in the heating section two, the temperature is controlled at 1265-1285°C, and the heating time is 70-100min; in the soaking section, the temperature is controlled at 1270-1280°C, and the heating time is 60-90min; the high temperature section includes the heating section two and the soaking section, the temperature is 130-190min, and the total heating time is 210-325min;

[0012] 2) High-pressure water dephosphorization: The surface oxide scale of the stainless steel composite plate is initially cleaned by spraying high-pressure water vapor to impact the surface oxide scale of the stainless steel composite plate.

[0013] 3) Slab rough rolling: The heated slab is transferred to the rough rolling mill through the transfer roller, and the transfer device is provided with a corresponding heat preservation cover; the rough rolling is performed in 5 passes, and a corresponding oxide scale cleaning device is provided between the first and second passes to reduce the occurrence of warping defects when rolling stainless steel composite plates; the first pass reduction rate is 23-25%; the second pass reduction rate is 16-19%; the third pass reduction rate is 20-22%; the fourth pass reduction rate is 21-23%; the fifth pass reduction rate is 16-20%;

[0014] 4) Hot coil box coiling stainless steel plate: The head and tail of the stainless steel plate are replaced by coiling first and then uncoiling.

[0015] 5) Fly shears the head and tail of the stainless steel plate.

[0016] 6) Slab finishing rolling: After rough rolling, the slab is transferred to the finishing rolling mechanism for finishing rolling. The finishing rolling adopts the speed increase rolling, and the finishing rolling start temperature is set at 1070-1090℃; the finishing rolling end temperature is greater than 900℃

[0017] 7) After cooling, curl transfer is performed.

[0018] Step 3) The oxide scale cleaning device during the rough rolling of the slab includes a vibration mechanism, a cleaning mechanism, and a roll cleaning mechanism. The vibration mechanism, the cleaning mechanism, and the roll cleaning mechanism are arranged between two adjacent groups of hot rolling mills; the cleaning mechanism is arranged between the vibration mechanism and the roll cleaning mechanism. During the transmission of the stainless steel composite plate, the stainless steel composite plate is hammered and vibrated by the vibration mechanism to loosen the attached oxide scale, and then the oxide scale on the surface of the stainless steel composite plate is cleaned by the cleaning mechanism. Finally, the oxide scale residue adhered to the surface of the roller is cleaned by the roll cleaning mechanism to ensure the cleanliness of the roller surface.

[0019] The vibration mechanism includes a first frame, a vibration frame, a toggle shaft, a first limit plate, and a fourth motor; the first limit plate is fixedly connected to the first frame, the vibration frame is provided with a first guide shaft, the first guide shaft is plugged into the first limit plate and can slide with each other, the first guide shaft is provided with a sleeved first spring, the first spring touches the first limit plate and the vibration frame; a transverse axis is provided at the end of the first guide shaft, the toggle shaft is arranged obliquely above the transverse axis, 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 the toggle rod is arranged on one side of the end of the transverse axis; the fourth motor is fixed to the first frame through a motor seat, a sprocket is provided on the fourth motor and the sprocket at the end of the toggle shaft is connected through a chain.

[0020] The cleaning mechanism includes a second frame and a cleaning mechanism; the cleaning mechanism is provided with a pair and symmetrically arranged on the second frame, and the cleaning mechanism includes a scraper and a baffle; a first rotating shaft is provided at one end of the scraper and is hingedly connected to the second frame, and a pair of baffles are provided and are respectively fixed to the two ends of the scraper, and a hinged screw is provided on the baffle, and a fixing plate is provided above the baffle, and the fixing plate is fixedly connected to the second frame, and a through groove is provided on the fixing plate, and a fixing block is provided in the through groove, and a second rotating shaft is provided on the fixing block and is 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 provided on the screw; a second spring is provided on the screw, and the second spring contacts the fixing block and the top plate at the bottom end of the screw.

[0021] A pushing mechanism is provided on the cleaning mechanism above. The pushing mechanism adopts the commonly used conveyor belt technology in the prior art, including a conveyor belt, a conveyor shaft and a first motor connected to the conveyor shaft and providing conveying power. The end of the conveyor shaft is rotatably connected to a baffle, 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 above. The conveying mechanism is provided 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 drag chain provided in the conveying box. The conveying drag chain includes a drag chain, a transmission shaft, and a second motor. The application of the conveying drag chain here is a mature existing technology. The second motor provides power to the transmission shaft so that the drag chain is driven by the gears on the transmission shaft for transmission. The end of the transmission shaft is rotatably connected to the conveying box, and a cam is provided on the transmission shaft.

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

[0024] The crushing cutter head is movably connected to the crushing frame; a mounting groove is provided on the crushing cutter head, and a second limit block is provided in the mounting groove; a first limit block is provided at the bottom end of the crushing frame, and the first limit block is provided in the mounting groove; the through shaft penetrates the crushing frame, the first limit block, the second limit block, and the crushing cutter head and can slide, and threads are provided at both ends of the through shaft and nuts are provided to fix the through shaft after the penetration is completed, so that the through shaft and the crushing cutter head become one; a sleeved fourth spring is provided on the through shaft, and the fourth spring is provided between the first limit block and the second limit block.

[0025] The roller cleaning mechanism includes a third frame, a mounting plate, a third motor, a roller cleaning plate, and a crankshaft; the mounting plate is arranged on the third frame, and a movable groove is provided on the mounting plate; a pair of roller cleaning plates are provided and are arranged up and down, and fixedly connected support plates are provided at both ends of the roller cleaning plates, and the support plates are slidably connected to the mounting plates; a hinged control plate is provided at one end of the roller cleaning plate, and one end of the control plate is arranged in the movable groove; the third motor is fixed to the mounting plate through a motor seat, and a crankshaft is provided at the shaft end of the third motor, and the crankshaft is rotatably connected to one end of the control plate; the roller cleaning plate is provided with saw teeth and touches the rollers on the hot rolling mill; a material receiving box fixedly connected to the mounting plate is provided under the roller cleaning plate for collecting the cleaned oxide scale and treating it uniformly.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1) During the rolling and transmission process of the stainless steel composite plate, before entering the next hot rolling unit, the stainless steel composite plate is hammered and vibrated by the vibration mechanism to loosen the attached oxide scale, and then the oxide scale on the surface of the stainless steel composite plate is cleaned by the cleaning mechanism, and finally the oxide scale residue adhering to the surface of the roller is cleaned by the roller cleaning mechanism to ensure the cleanliness of the roller surface;

[0028] In the vibration mechanism, the fourth motor drives the toggle shaft to rotate, and then drives the toggle rod to rotate and push the horizontal shaft, so that the horizontal shaft pulls the first guide shaft and the vibration frame to rise. As the toggle rod continues to rotate, it will be separated from the push on the horizontal shaft when it reaches a certain height. At this time, the first spring pushes the vibration frame to quickly eject and reset to hit the stainless steel composite plate to generate vibration. As the water is continuously hit, 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 cleaning process of the oxide scale, the cleaning mechanism scrapes off the oxide scale; in the cleaning mechanism at the top, the second spring pushes the baffle to make the scraper touch the stainless steel composite plate, and the second spring can push the scraper to adapt to the thickness of the stainless steel composite plate to make it close to the surface; during the transmission of the stainless steel composite plate, the oxide scale can be quickly collected by the scraper and the baffle, and then the transmission process of the oxide scale is accelerated by the pushing mechanism, and the oxide scale enters the transmission mechanism and is transferred, and further, the oxide scale can be crushed by the crushing mechanism during the transmission process, so that the transmission process is smoother; the scraper is set in the cleaning mechanism below to scrape off the oxide scale, and the oxide scale is directly collected and processed uniformly after falling;

[0030] In the pushing mechanism, the conveyor belt is driven to run by the first motor and the oxide scale on the scraper is moved by the toggle plate so that the oxide scale can be quickly transferred into the conveying box, thereby preventing the oxide scale from accumulating in large quantities on the scraper with an inclination. After the oxide scale enters the conveying box, it falls on the conveying chain in the conveying mechanism, and the conveying chain can be driven by the second motor to quickly transfer the oxide scale to avoid accumulation and falling on the slab. During the process of transferring the oxide scale, the cam rotates to push the ejector rod to drive the crushing rack to rise along the third guide shaft, and the ejector block is quickly reset by the third spring at the missing part of the cam so that the crushing cutter head crushes the oxide scale on the conveying chain, thereby reducing the volume of the oxide scale so that it can be smoothly transferred on the conveying chain without causing friction and jamming with the inner wall of the conveying box.

[0031] 3) Furthermore, in the above-mentioned crushing and conveying process, when the crushing cutter head hits the conveying chain, the conveying process continues, which can effectively prevent the oxide scale from being suppressed by the crushing cutter head and unable to be conveyed. In this arrangement, the crushing cutter head is movably connected to the crushing frame, so when the crushing cutter head hits the conveying chain, the crushing cutter head and the conveying chain will be driven to move synchronously according to the friction force. When the cam rotates and lifts the push rod, the crushing frame and the crushing cutter head are driven to separate from the conveying chain. The crushing cutter head is quickly reset under the push of the fourth spring to prepare for the next crushing, avoiding inconvenient interference with the normal transmission and transfer of the oxide scale, which will cause the oxide scale to be untimely transmitted and cause accumulation;

[0032] Finally, the roller cleaning plate in the roller cleaning mechanism is driven by the third motor to rotate the crankshaft and then pull the control plate to move, so that the crankshaft and the control plate are used to drive the upper and lower roller cleaning plates to slide back and forth left and right. At the same time, the serrations cooperate with the left and right sliding of the roller cleaning plates to generate cutting force, which cooperates with the rotation of the rolling roller to not only achieve scraping but also oblique cutting, thereby reducing the difficulty of the roller cleaning plate to clean the stubborn oxide scale adhered to the rolling roller and improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Attached Figure 1 The present invention is a schematic diagram of the structure of the oxide scale cleaning device in the process step 3) of eliminating the buckle head and surface defects of the hot-rolled stainless steel composite plate strip. Figure 1 ;

[0034] Attached Figure 2 The present invention is a schematic diagram of the structure of the oxide scale cleaning device in the process step 3) of eliminating the buckle head and surface defects of the hot-rolled stainless steel composite plate strip. Figure 2 ;

[0035] Attached Figure 3 The present invention is a schematic diagram of the structure of the oxide scale cleaning device in the process step 3) of eliminating the buckle head and surface defects of the hot-rolled stainless steel composite plate strip. Figure 3 ;

[0036] Attached Figure 4This is the structural diagram of the roller cleaning mechanism. Figure 1 ;

[0037] Attached Figure 5 This is the structural diagram of the roller cleaning mechanism. Figure 2 ;

[0038] Attached Figure 6 It is a schematic diagram of the structure of the cleaning mechanism;

[0039] Attached Figure 7 It is a structural diagram of the pushing mechanism;

[0040] Attached Figure 8 It is a structural schematic diagram of the vibration mechanism;

[0041] Attached Fig. 9 It is a schematic diagram of the structure of the crushing mechanism and the conveying mechanism;

[0042] Attached Fig.10 It is a schematic diagram of the structure of the crushing rack and the crushing cutter head;

[0043] Attached Fig.11 It is a schematic diagram of the structure of the transmission mechanism;

[0044] In the figure: 1, vibration mechanism; 11, first frame; 12, vibration frame; 13, first guide shaft; 131, first spring; 14, horizontal axis; 15, toggle shaft; 151, toggle rod; 16, first limit plate; 17, fourth motor;

[0045] 2. cleaning mechanism; 21. second frame; 22. cleaning 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. Toggle plate;

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

[0048] 25, crushing mechanism; 251, second limit plate; 252, crushing frame; 2521, third spring; 2522, third guide shaft; 2523, limit screw rod; 2524, push rod; 2525, first limit block;

[0049] 253, crushing cutter head; 2531, mounting slot; 2532, second limit block;

[0050] 254, through shaft; 2541, fourth spring;

[0051] 3. Roller cleaning mechanism; 31. Third frame; 311. Mounting plate; 312. Movable slot; 32. Third motor; 33. Roller cleaning plate; 331. Saw teeth; 332. Support plate; 333. Control board; 34. Crankshaft; 35. Material receiving box;

[0052] 4. Roller; 5. Stainless steel composite plate. DETAILED DESCRIPTION

[0053] To facilitate the understanding of those skilled in the art, Figure 1-11 , the technical solution of the present invention is further specifically described.

[0054] Example 1, using double-sided composite plate as the implementation material, the base plate is 304 stainless steel, and the cover plate is Q345 low carbon steel:

[0055] A process for eliminating buckled heads and surface defects in hot-rolled stainless steel composite plate strips, the specific steps are as follows:

[0056] 1) Slab heating: The heating steps are preheating section, heating section one, heating section two, and soaking section; the heating steps are divided into preheating section, heating section one, heating section two, and soaking section; in the preheating section, the temperature is controlled at 900°C and the heating time is 60min; in the heating section one, the temperature is controlled at 1050°C and the heating time is 75min; in the heating section two, the temperature is controlled at 1280°C and the heating time is 100min; in the soaking section, the temperature is controlled at 1280°C and the heating time is 90min; the total heating time is 315min;

[0057] 2) High-pressure water dephosphorization: The surface oxide scale of the stainless steel composite plate is initially cleaned by spraying high-pressure water vapor to impact the surface oxide scale of the stainless steel composite plate.

[0058] 3) Slab rough rolling: The heated slab is transferred to the rough rolling mill through the transfer roller, and the transfer device is provided with a corresponding heat preservation cover; the rough rolling is performed in 5 passes, and a corresponding oxide scale cleaning device is provided between the first and second passes to reduce the occurrence of warping defects when rolling stainless steel composite plates; the first pass reduction rate is 25%; the second pass reduction rate is 19%; the third pass reduction rate is 22%; the fourth pass reduction rate is 23%; the fifth pass reduction rate is 20%;

[0059] 4) Hot coil box coiling stainless steel plate: The head and tail of the stainless steel plate are replaced by coiling first and then uncoiling.

[0060] 5) Fly shears the head and tail of the stainless steel plate.

[0061] 6) Slab finishing rolling: After rough rolling, the slab is transferred to the finishing rolling mechanism for finishing rolling. The finishing rolling adopts the speed increase rolling, and the finishing rolling start temperature is set at 1090℃; the finishing rolling end temperature is 1000℃

[0062] 7) After cooling, curl transfer is performed.

[0063] Step 3) The oxide scale cleaning device in the rough rolling of the slab includes a vibration mechanism 1, a cleaning mechanism 2, and a roller cleaning mechanism 3. The vibration mechanism 1, the cleaning mechanism 2, and the roller cleaning mechanism 3 are arranged between two adjacent groups of hot rolling mills; the cleaning mechanism 2 is arranged between the vibration mechanism 1 and the roller cleaning mechanism 3. During the transmission of the stainless steel composite plate 5, the stainless steel composite plate 5 is hammered and vibrated by the vibration mechanism 1 to loosen the attached oxide scale, and then the oxide scale on the surface of the stainless steel composite plate 5 is cleaned by the cleaning mechanism 2, and finally the oxide scale residue adhered to the surface of the roller 4 is cleaned by the roller cleaning mechanism 3 to ensure the cleanliness of the surface of the roller 4.

[0064] The vibration mechanism 1 includes a first frame 11, a vibration frame 12, a toggle shaft 15, a first limit plate 16, and a fourth motor 17; the first limit plate 16 is fixedly connected to the first frame 11, the vibration frame 12 is provided with a first guide shaft 13, the first guide shaft 13 is plugged into the first limit plate 16 and can slide with each other, the first guide shaft 13 is provided with a sleeved first spring 131, the first spring 131 touches the first limit plate 16 and the vibration frame 12; the end of the first guide shaft 13 is provided with a transverse shaft 14, the toggle shaft 15 is arranged obliquely above the transverse 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, and the toggle rod 151 is arranged on one side of the end of the transverse shaft 14; the fourth motor 17 is fixed to the first frame 11 through a motor seat, and the fourth motor 17 is provided with a sprocket and connected to the sprocket at the end of the toggle shaft 15 through a chain.

[0065] The cleaning mechanism 2 includes a second frame 21 and a cleaning mechanism 22; the cleaning mechanism 22 is provided with a pair and symmetrically arranged on the second frame 21, and the 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 is hingedly connected to the second frame 21, and the baffle 222 is provided with a pair and is respectively fixed at both ends of the scraper 221, and the baffle 222 is provided with a hinge screw 225, and a fixing plate 224 is provided above the baffle 222, and the fixing plate 224 The fixing plate 224 is fixedly connected to the second frame 21, a through slot is provided on the fixing plate 224, a fixing block 227 is provided in the through slot, a second rotating shaft 2271 is provided on the fixing block 227 and is rotatably connected to the fixing plate 224; the screw rod 225 passes through the fixing block 227, and the screw rod 225 and the fixing block 227 are slidably connected through a through hole; a nut is provided on the screw rod 225; a second spring 226 is sleeved on the screw rod 225, and the second spring 226 touches the fixing block 227 and the top plate at the bottom end of the screw rod 225.

[0066] A pushing mechanism 23 is provided on the cleaning mechanism 22 arranged above. The pushing mechanism 23 adopts the commonly used conveyor belt technology in the prior art for transmission, including a conveyor belt, a conveyor shaft and a first motor 231 connected to the conveyor shaft and providing transmission power. The end of the conveyor shaft is rotatably connected to a baffle 222, and a toggle plate 232 is provided on the conveyor belt to facilitate pushing and transmission.

[0067] A conveying mechanism 24 is provided on the cleaning mechanism 22 arranged above. The conveying mechanism 24 is arranged 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 drag chain 242 arranged in the conveying box 241, and the conveying drag chain 242 includes a drag chain, a transmission shaft 244, and a second motor 245. The application of the conveying drag chain here is a mature existing technology. The second motor 245 provides power to the transmission shaft 244 so that the drag chain is driven by the gear on the transmission shaft 244 for transmission; wherein the end of the transmission shaft 244 is rotatably connected to the conveying box 241, and a cam 243 is provided on the transmission shaft 244.

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

[0069] The crushing cutter head 253 is movably connected to the crushing frame 252; the crushing cutter head 253 is provided with a mounting groove 2531, and a second limit block 2532 is provided in the mounting groove 2531; the bottom end of the crushing frame 252 is provided with a first limit block 2525, and the first limit block 2525 is arranged in the mounting groove 2531; the through shaft 254 penetrates the crushing frame 252, the first limit block 2525, the second limit block 2532, and the crushing cutter head 253 and can slide, and both ends of the through shaft 254 are provided with threads and nuts for fixing after the penetration is completed, so that the through shaft 254 and the crushing cutter head 253 become one; the through shaft 254 is provided with a sleeved fourth spring 2541, and the fourth spring 2541 is arranged between the first limit block 2525 and the second limit block 2532.

[0070] The roller cleaning mechanism 3 includes a third frame 31, a mounting plate 311, a third motor 32, a roller cleaning plate 33, and a crankshaft 34; the mounting plate 311 is arranged on the third frame 31, and a movable groove 312 is provided on the mounting plate 311; the roller cleaning plate 33 is provided with a pair and is arranged up and down, and fixedly connected support plates 332 are provided at both ends of the roller cleaning plate 33, and the support plates 332 are slidably connected to the mounting plate 311; a hinged control plate 333 is provided at one end of the roller cleaning plate 33, and one end of the control plate 333 is arranged in the movable groove 312; the third motor 32 is fixed to the mounting plate 311 through a motor seat, and a crankshaft 34 is provided at the shaft end of the third motor 32, and the crankshaft 34 is rotatably connected to one end of the control plate 333; the roller cleaning plate 33 is provided with saw teeth 331 and contacts the rollers 4 on the hot rolling mill; a material receiving box 35 fixedly connected to the mounting plate 311 is provided below the roller cleaning plate for collecting the cleaned oxide scale and treating it uniformly.

[0071] Embodiment 2:

[0072] The difference compared with Example 1 is:

[0073] Step 1) Slab heating: preheating section, temperature controlled at 850°C, heating time 30min; heating section, 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 transferred to the rough rolling mill via a transfer roller, and a corresponding heat preservation cover is provided on the transfer device; the rough rolling is performed in 5 passes, and a corresponding oxide scale cleaning device is provided between the first and second passes to reduce the occurrence of warping defects when rolling the stainless steel composite plate; the first pass reduction rate is 23%; the second pass reduction rate is 16%; the third pass reduction rate is 20%; the fourth pass reduction rate is 21%; and the fifth pass reduction rate is 16%.

[0075] Embodiment 3:

[0076] The difference compared with Example 1 is:

[0077] Step 1) Slab heating: preheating section, temperature controlled at 880°C, heating time 50min; heating section, 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) rough rolling of slab: the heated slab is transferred to the rough rolling mill via a transfer roller, and a corresponding heat preservation cover is provided on the transfer device; the rough rolling is performed in 5 passes, and a corresponding oxide scale cleaning device is provided between the first and second passes to reduce the occurrence of warping defects when rolling the stainless steel composite plate; the first pass reduction rate is 24%; the second pass reduction rate is 17%; the third pass reduction rate is 21%; the fourth pass reduction rate is 22%; the fifth pass reduction rate is 18%.

[0079] Comparative Example 1:

[0080] The difference compared with Example 1 is that in step 3) of this comparative example 1, no corresponding oxide scale cleaning device, including a vibration mechanism, a cleaning mechanism, and a roller cleaning mechanism, is set between the first and second rolling passes.

[0081] Comparative Example 2:

[0082] The difference compared with Example 2 is that in step 3) of this comparative example 1, no corresponding oxide scale cleaning device, including a vibration mechanism, a cleaning mechanism, and a roller cleaning mechanism, is set between the first and second rolling passes.

[0083] Test Example 1:

[0084] The specific steps are as follows:

[0085] 1) Slab heating: The heating steps are preheating section, heating section one, heating section two, and soaking section; the heating steps are divided into preheating section, heating section one, heating section two, and soaking section; in the preheating section, the temperature is controlled at 800°C and the heating time is 25min; in the heating section one, the temperature is controlled at 900°C and the heating time is 40min; in the heating section two, the temperature is controlled at 1150°C and the heating time is 50min; in the soaking section, the temperature is controlled at 1160°C and the heating time is 45min; the total heating time is 160min;

[0086] 2) High-pressure water dephosphorization: The surface oxide scale of the stainless steel composite plate is initially cleaned by spraying high-pressure water vapor to impact the surface oxide scale of the stainless steel composite plate.

[0087] 3) Slab rough rolling: The heated slab is transferred to the rough rolling mill through the transfer roller, and the transfer device is provided with a corresponding heat preservation cover; the rough rolling is performed in 5 passes, with a first pass reduction rate of 20%; a second pass reduction rate of 15%; a third pass reduction rate of 18%; a fourth pass reduction rate of 19%; and a fifth pass reduction rate of 13%;

[0088] 4) Hot coil box coiling stainless steel plate: The head and tail of the stainless steel plate are replaced by coiling first and then uncoiling.

[0089] 5) Fly shears the head and tail of the stainless steel plate.

[0090] 6) Slab finishing rolling: After rough rolling, the slab is transferred to the finishing rolling mechanism for finishing rolling. The finishing rolling adopts the speed increase rolling, and the finishing rolling start temperature is set at 870℃; the finishing rolling end temperature is 780℃

[0091] 7) After cooling, curl transfer is performed.

[0092] Test Example 2:

[0093] The specific steps are as follows:

[0094] 1) Slab heating: The heating steps are preheating section, heating section, heating section and soaking section; the heating steps are divided into preheating section, heating section, heating section and soaking section; in the preheating section, the temperature is controlled at 1000℃ and the heating time is 70min; in the heating section, the temperature is controlled at 1150℃ and the heating time is 80min; in the heating section, the temperature is controlled at 1310℃ and the heating time is 110min; in the soaking section, the temperature is controlled at 1320℃ and the heating time is 100min; the total heating time is 360min;

[0095] 2) High-pressure water dephosphorization: The surface oxide scale of the stainless steel composite plate is initially cleaned by spraying high-pressure water vapor to impact the surface oxide scale of the stainless steel composite plate.

[0096] 3) Slab rough rolling: The heated slab is transferred to the rough rolling mill through the transfer roller, and the transfer device is provided with a corresponding heat preservation cover; the rough rolling is performed in 5 passes, with a first pass reduction rate of 26.5%; a second pass reduction rate of 21%; a third pass reduction rate of 23%; a fourth pass reduction rate of 25%; and a fifth pass reduction rate of 22.5%;

[0097] 4) Hot coil box coiling stainless steel plate: The head and tail of the stainless steel plate are replaced by coiling first and then uncoiling.

[0098] 5) Fly shears the head and tail of the stainless steel plate.

[0099] 6) Slab finishing rolling: After rough rolling, the slab is transferred to the finishing rolling mechanism for finishing rolling. The finishing rolling adopts the speed increase rolling, and the finishing rolling start temperature is set at 1150°C; the finishing rolling end temperature is 1090°C;

[0100] 7) After cooling, curl transfer is performed.

[0101] According to GBT8165-2008, the mechanical properties of the above examples were tested, and the test results are shown in the following table:

[0102] Tensile strengthMpa Elongation strength Mpa Elongation after break % in conclusion Button head defect (visual inspection) Example 1 482 290 51 qualified No such defect Example 2 479 287 55 qualified No such defect Example 3 469 265 53.5 qualified No such defect Comparative Example 1 481 280 52 qualified Slight tilt Comparative Example 2 490 278 52.8 qualified Slightly deduct Test Example 1 376 215 39 Failure Obvious discount Test Example 2 382 225 37.5 Failure Obvious discount

[0103] In summary: the numerical parameters in the above embodiments 1-3 are implemented according to the process standards for plate rolling, and relevant oxide scale cleaning devices, namely, vibration mechanism, cleaning mechanism, and roller cleaning mechanism, are set and used in step 3); the numerical parameters in comparative examples 1-2 are implemented according to the process standards for plate rolling, and relevant oxide scale cleaning devices are not set and used in step 3); the numerical parameters in test example 1 are lower than the process standards for plate rolling, and the numerical parameters in test example 2 are higher than the process standards for plate rolling, and test examples 1 and 2 also do not set and use relevant oxide scale cleaning devices in step 3).

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

[0105] Secondly, compared with Example 1-3, Comparative Example 1-2 does not use the relevant oxide scale cleaning device in step 3). At the same time, in the experimental results, the surface of the plate produced by Comparative Example 1-2 was found to have slight buckle and warping defects through 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 Example 1-3 and Comparative Example 1-2, Test Example 1-2 not only has substandard mechanical properties, but also has obvious disadvantages of lifted buckle heads.

[0107] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0108] In summary, electronic or electrical components including but not limited to motors are components in the prior art, obtained through private customization or purchase, and the electrical connections between the components are conventional circuit connections or electrical connections in the prior art, which are not within the scope of protection of the present invention;

[0109] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A process for eliminating buckle heads and surface defects in hot-rolled stainless steel composite plate strips, characterized in that The specific steps are as follows: 1) Slab heating: The heating steps are preheating section, heating section one, heating section two, and soaking section; the heating steps are divided into preheating section, heating section one, heating section two, and soaking section; in the preheating section, the temperature is controlled at 850-900°C, and the heating time is 30-60min; in the heating section one, the temperature is controlled at 1010-1050°C, and the heating time is 50-75min; in the heating section two, the temperature is controlled at 1265-1285°C, and the heating time is 70-100min; in the soaking section, the temperature is controlled at 1270-1280°C, and the heating time is 60-90min; the high temperature section includes the heating section two and the soaking section, the temperature is 130-190min, and the total heating time is 210-325min; 2) High-pressure water dephosphorization: The surface oxide scale of the stainless steel composite plate is initially cleaned by spraying high-pressure water vapor to impact the surface oxide scale of the stainless steel composite plate. 3) Slab rough rolling: The heated slab is transferred to the rough rolling mill through the transfer roller, and the transfer device is provided with a corresponding heat preservation cover; the rough rolling is performed in 5 passes, and a corresponding oxide scale cleaning device is provided between the first and second passes to reduce the occurrence of warping defects when rolling stainless steel composite plates; the first pass reduction rate is 23-25%; the second pass reduction rate is 16-19%; the third pass reduction rate is 20-22%; the fourth pass reduction rate is 21-23%; the fifth pass reduction rate is 16-20%; 4) Hot coil box coiling stainless steel plate: The head and tail of the stainless steel plate are replaced by coiling first and then uncoiling. 5) Fly shears the head and tail of the stainless steel plate. 6) Slab finishing rolling: After rough rolling, the slab is transferred to the finishing rolling mechanism for finishing rolling. The finishing rolling adopts the speed increase rolling, and the finishing rolling start temperature is set at 1070-1090℃; the finishing rolling end temperature is greater than 900℃ 7) After cooling, curl transfer is performed.

2. The process for eliminating buckled heads and surface defects of hot-rolled stainless steel composite plate strip according to claim 1, characterized in that Step 3) The oxide scale cleaning device during the rough rolling of the slab includes a vibration mechanism, a cleaning mechanism, and a roll cleaning mechanism. The vibration mechanism, the cleaning mechanism, and the roll cleaning mechanism are arranged between two adjacent groups of hot rolling mills; the cleaning mechanism is arranged between the vibration mechanism and the roll cleaning mechanism. During the transmission of the stainless steel composite plate, the stainless steel composite plate is hammered and vibrated by the vibration mechanism to loosen the attached oxide scale, and then the oxide scale on the surface of the stainless steel composite plate is cleaned by the cleaning mechanism. Finally, the oxide scale residue adhered to the surface of the roller is cleaned by the roll cleaning mechanism to ensure the cleanliness of the roller surface.

3. The process for eliminating buckled heads and surface defects of hot-rolled stainless steel composite plate strip according to claim 2, characterized in that The vibration mechanism includes a first frame, a vibration frame, a toggle shaft, a first limit plate, and a fourth motor; the first limit plate is fixedly connected to the first frame, the vibration frame is provided with a first guide shaft, the first guide shaft is plugged into the first limit plate and can slide with each other, the first guide shaft is provided with a sleeved first spring, the first spring touches the first limit plate and the vibration frame; a transverse axis is provided at the end of the first guide shaft, the toggle shaft is arranged obliquely above the transverse axis, 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 the toggle rod is arranged on one side of the end of the transverse axis; the fourth motor is fixed to the first frame through a motor seat, a sprocket is provided on the fourth motor and the sprocket at the end of the toggle shaft is connected through a chain.

4. The process for eliminating buckled heads and surface defects of hot-rolled stainless steel composite plate strip according to claim 2, characterized in that The cleaning mechanism includes a second frame and a cleaning mechanism; the cleaning mechanism is provided with a pair and symmetrically arranged on the second frame, and the cleaning mechanism includes a scraper and a baffle; a first rotating shaft is provided at one end of the scraper and is hingedly connected to the second frame, and a pair of baffles are provided and are respectively fixed to the two ends of the scraper, and a hinged screw is provided on the baffle, and a fixing plate is provided above the baffle, and the fixing plate is fixedly connected to the second frame, and a through groove is provided on the fixing plate, and a fixing block is provided in the through groove, and a second rotating shaft is provided on the fixing block and is 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 provided on the screw; a second spring is provided on the screw, and the second spring contacts the fixing block and the top plate at the bottom end of the screw.

5. The process for eliminating buckled heads and surface defects of hot-rolled stainless steel composite plate strip according to claim 4, characterized in that A pushing mechanism is arranged on the upper cleaning mechanism, including a conveyor belt, a conveyor shaft and a first motor connected to the conveyor shaft and providing conveying power. The end of the conveyor shaft is rotatably connected to a baffle, and a toggle plate is arranged on the conveyor belt to facilitate pushing and conveying.

6. The process for eliminating buckled heads and surface defects of hot-rolled stainless steel composite plate strip according to claim 4, characterized in that A conveying mechanism is provided on the cleaning mechanism arranged above, and the conveying mechanism is arranged on one side of the cleaning mechanism and fixedly connected to the second frame; the conveying mechanism includes a conveying box and a conveying drag chain arranged in the conveying box, and the conveying drag chain includes a drag chain, a transmission shaft, and a second motor. The application of the conveying drag chain here is a mature existing technology, and the second motor provides power to the transmission shaft so that the drag chain is driven by the gear on the transmission shaft for transmission; The end of the transmission shaft is rotatably connected to the conveying box, and a cam is arranged on the transmission shaft.

7. The process for eliminating buckled heads and surface defects of hot-rolled stainless steel composite plate strip according to claim 6, characterized in that A crushing mechanism is provided above the conveying mechanism, including a second limit plate, a crushing frame, a crushing cutter head, and a through shaft; the second limit plate is fixedly connected to the second frame, the crushing frame is provided with a third guide shaft and a limit screw rod, the third guide shaft and the limit screw rod are slidably connected to the second limit plate, the third guide shaft is provided with a sleeved third spring, and the limit screw rod is provided with a fastening nut; a push rod is provided on one side of the crushing frame, and the push rod touches the cam.

8. The process for eliminating buckled heads and surface defects of hot-rolled stainless steel composite plate strip according to claim 7, characterized in that The crushing cutter head is movably connected to the crushing frame; a mounting groove is provided on the crushing cutter head, and a second limit block is provided in the mounting groove; a first limit block is provided at the bottom end of the crushing frame, and the first limit block is provided in the mounting groove; the through shaft penetrates the crushing frame, the first limit block, the second limit block, and the crushing cutter head and can slide, and threads are provided at both ends of the through shaft and nuts are provided to fix the through shaft after the penetration is completed, so that the through shaft and the crushing cutter head become one; a sleeved fourth spring is provided on the through shaft, and the fourth spring is provided between the first limit block and the second limit block.

9. The process for eliminating buckled heads and surface defects of hot-rolled stainless steel composite plate strip according to claim 2, characterized in that The roller cleaning mechanism includes a third frame, a mounting plate, a third motor, a roller cleaning plate, and a crankshaft; the mounting plate is arranged on the third frame, and a movable groove is provided on the mounting plate; a pair of roller cleaning plates are provided and are arranged up and down, and fixedly connected support plates are provided at both ends of the roller cleaning plates, and the support plates are slidably connected to the mounting plates; a hinged control plate is provided at one end of the roller cleaning plate, and one end of the control plate is arranged in the movable groove; the third motor is fixed to the mounting plate through a motor seat, and a crankshaft is provided at the shaft end of the third motor, and the crankshaft is rotatably connected to one end of the control plate; the roller cleaning plate is provided with saw teeth and touches the rollers on the hot rolling mill; a material receiving box fixedly connected to the mounting plate is provided under the roller cleaning plate for collecting the cleaned oxide scale and treating it uniformly.

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