Variable thickness rolling apparatus and method of use
Patent Information
- Application Number
- CN202611201257.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-10
- Publication Date
- 2026-09-18
AI Technical Summary
然而，现有双辊系轧机通常采用固定传动比，两道次轧辊线速度固定且无法独立调节，难以满足不同材质、不同厚度规格对变形工艺参数的动态需求
本发明采用内置双联齿轮和换挡机构的换挡齿轮箱，通过设置第一齿轮与第二齿轮及第三齿轮的模数相同而齿数不同，使得第一输出轴与第三输出轴的传动比不同，进而实现第一道次轧辊与第二道次轧辊的线速度不同。该设计可根据不同材料的变形特性，独立设定两道次的轧制速度，优化变形条件和张力控制，提高变厚度轧制的工艺适应性；
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Figure CN122769263A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of rolling equipment technology, and specifically relates to a variable thickness rolling equipment and its usage method. Background Technology
[0002] Rolling is one of the main methods of metal plastic processing and is widely used in the production of sheet and strip. In multi-pass rolling processes, to improve the microstructure and properties of the sheet and control the shape and thickness accuracy, it is often necessary to apply different reductions (i.e., variable thickness) and different rolling speeds in different passes. There are two main traditional methods to achieve variable thickness: one is to use a multi-stand continuous rolling mill, where each stand has an independent reduction device and transmission system, which requires large equipment investment, a large footprint, and high maintenance costs; the other is to use a single-stand reversible rolling mill, which achieves multiple passes through repeated back-and-forth rolling. However, this method has low production efficiency, and the machine needs to be stopped between each pass to adjust the roll gap and speed, making continuous production impossible. At the same time, frequent start-ups and shutdowns affect equipment life and product consistency.
[0003] In recent years, some patents have proposed twin-roll or multi-roll combined rolling mills, attempting to complete two or more rolling passes in a single pass. However, existing twin-roll rolling mills typically use a fixed transmission ratio, with the linear speeds of the two rolls fixed and unable to be adjusted independently, making it difficult to meet the dynamic requirements of deformation process parameters for different materials and thicknesses. Furthermore, when it is necessary to change the thickness distribution, gears often need to be replaced, which is cumbersome and cannot be switched online, thus limiting the development of flexible rolling production. Summary of the Invention
[0004] The present invention provides a variable thickness rolling equipment and a method for using it to address the above-mentioned problems.
[0005] To achieve the above objectives, the present invention employs the following technical solution: A variable thickness rolling mill includes a geared motor. The output shaft of the geared motor is fixedly connected to the input shaft of a shift gearbox. The shift gearbox includes a housing, and a first gear is disposed within the housing. The first gear is slidably mounted on the input shaft of the shift gearbox via a spline. The other end of the input shaft is rotatably connected to a first support plate, which is fixedly mounted within the housing. The left and right sides of the first gear mesh with a second gear and a third gear, respectively. The second gear is a double gear and is fixedly connected to one end of a first output shaft. A fourth gear is fixedly connected to the other end of the first output shaft. Both ends of the first output shaft are rotatably connected to the housing. The fourth gear meshes with a fifth gear, which is fixedly connected to a second output shaft. One end of the output shaft is rotatably connected to the second support plate, and the other end of the second output shaft is rotatably connected to the housing. The second support plate is fixedly installed inside the housing. The second output shaft is parallel to and directly above the first output shaft. The third gear is fixedly connected to one end of the third output shaft, and the other end of the third output shaft is fixedly connected to the sixth gear. Both ends of the third output shaft are rotatably connected to the housing. The sixth gear meshes with the seventh gear. The seventh gear is fixedly connected to the fourth output shaft. The fourth output shaft is parallel to and directly above the third output shaft. Both ends of the fourth output shaft are rotatably connected to the housing. A shifting mechanism is installed on the upper part of the first support plate to switch the meshing state of the first gear. The output shaft of the shifting gearbox extends out of the housing and is fixedly connected to the rolls of the variable thickness rolling mill.
[0006] Furthermore, the first gear has the same module as the second and third gears, but different numbers of teeth, while the fourth, fifth, sixth, and seventh gears have the same module and number of teeth.
[0007] Furthermore, the shifting mechanism includes a shifting hydraulic cylinder, the piston rod of which is fixedly connected to one end of a telescopic hydraulic rod. The axis of the telescopic hydraulic rod is parallel to and located directly above the input shaft. The other end of the telescopic hydraulic rod is fixedly connected to a shift fork, which pushes the first gear to reciprocate axially.
[0008] Furthermore, the shift fork is U-shaped, and the left and right ends of the first gear are provided with annular grooves that cooperate with the shift fork.
[0009] Furthermore, the variable thickness rolling mill includes a frame, within which are arranged two sets of parallel and spaced-apart first and second roll systems. The first roll system consists of a lower roll and an upper roll, while the second roll system consists of a lower roll and an upper roll. The lower roll of the first roll system is fixedly connected to the first output shaft, and the upper roll of the first roll system is fixedly connected to the second output shaft. The lower roll of the second roll system is fixedly connected to the third output shaft via a cross-shaft coupling, and the upper roll of the second roll system is fixedly connected to the fourth output shaft via a cross-shaft coupling. A pressing drive is mounted on the frame, and the output end of the pressing drive is connected to the bearing seat of the upper roll of the second roll system, for driving the upper roll of the second roll system to move vertically to adjust the pressing amount of the second roll system.
[0010] Furthermore, the pressing drive is a manual pressing device or a hydraulic cylinder pressing device.
[0011] The rolling method of the variable thickness rolling equipment includes the following steps: S1, first gear: The shifting hydraulic cylinder is in its initial state, with its piston rod in the retracted position, driving the telescopic hydraulic rod and shift fork to the initial working position. At this time, the first gear disengages from the third gear and only engages with the second gear. The transmission path between the first output shaft and the third output shaft is disconnected, and the second roller system is in a follow-up state. At the same time, the roll gap between the first roller system and the second roller system is kept consistent, that is, the roll gap between the lower roll and the upper roll of the first roller system is equal to the roll gap between the lower roll and the upper roll of the second roller system, thus achieving equal thickness rolling. S2, second gear: In the stopped state, the shifting hydraulic cylinder drives the piston rod to extend, causing the telescopic hydraulic rod and shift fork to move axially in the forward direction. The shift fork pushes the first gear until the first gear meshes with the second and third gears simultaneously. At this time, the shifting mechanism switches to the second gear. The pressing drive is operated to press the output end of the press down on the bearing seat of the rolls on the second roll system. The rolls on the second roll system move downward in the vertical direction, reducing the roll gap of the second roll system. This makes the reduction of the second roll system less than that of the first roll system, thus achieving variable thickness rolling with different linear velocities between the first and second roll systems.
[0012] Compared with the prior art, the present invention has the following advantages: This invention employs a gearbox with a built-in double gear and shifting mechanism. By setting the first, second, and third gears to have the same module but different numbers of teeth, the transmission ratios of the first and third output shafts differ, thereby achieving different linear velocities between the first and second passes of the rolling mill. This design allows for independent setting of the rolling speeds for the two passes based on the deformation characteristics of different materials, optimizing deformation conditions and tension control, and improving the process adaptability of variable thickness rolling. This invention achieves online switching of the reduction amount by switching the meshing state of the first gear through a shifting mechanism and adjusting the vertical position of the rolls on the second roll system in conjunction with the pressing drive component. When the first gear is in the first gear position, the roll gap of the two sets of rolls is consistent, and the reduction amount of the two rolling passes is the same, which is suitable for equal thickness rolling. When the first gear is in the second gear position, the pressing drive component drives the rolls on the second roll system to press down, so that the reduction amount of the second pass is less than that of the first pass, realizing variable thickness rolling. This design eliminates the need to stop the machine to change gears, making operation convenient and significantly improving production efficiency. This invention, by using different rolling speeds and adjusting the reduction amount, can adapt to the two-pass rolling requirements of plates with different materials and thicknesses, and is especially suitable for flexible production scenarios with multiple varieties and small batches, enabling the production of multiple specifications of products without changing equipment. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the gearbox structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the shift gearbox of the present invention; Figure 4 This is a schematic diagram of the shifting mechanism of the present invention; Figure 5 This is a schematic diagram of the structure of the first output roller system of the present invention; Figure 6 This is a schematic diagram of the structure of the second output roller system of the present invention; Figure 7 This is a schematic diagram of the structure of the first gear and the shift fork of the present invention. Figure 8 This is a schematic diagram of the structure of the first gear position of the present invention; Figure 9 This is a schematic diagram of the second gear position of the present invention.
[0014] In the figure, there is a geared motor 1, a gearbox 2, a housing 201, a first gear 202, a first support plate 203, a second gear 204, a third gear 205, a first output shaft 206, a fourth gear 207, a fifth gear 208, a second output shaft 209, a second support plate 210, a third output shaft 211, a sixth gear 212, a seventh gear 213, a fourth output shaft 214, a shifting mechanism 215, a shifting hydraulic cylinder 2151, a telescopic hydraulic rod 2152, a shift fork 2153, an annular groove 2154, a variable thickness rolling mill 3, a frame 301, a first roll system 302, a lower roll of the first roll system 3021, an upper roll of the first roll system 3022, a second roll system 303, a lower roll of the second roll system 3031, an upper roll of the second roll system 3032, and a pressing drive component 304. Detailed Implementation
[0015] To further illustrate the technical solution of the present invention, the present invention will be further described below through embodiments.
[0016] like Figures 1 to 9As shown, a variable thickness rolling mill and its method of use include a geared motor 1. The output shaft of the geared motor 1 is fixedly connected to the input shaft of a shift gearbox 2. The shift gearbox 2 includes a housing 201, in which a first gear 202 is disposed. An external spline is machined axially on the outer periphery of the input shaft of the shift gearbox 2. An internal spline is machined in the inner hole of the first gear 202 to match it. The first gear 202 forms a sliding spline pair through the meshing of the internal spline and the external spline, so that it can be driven by the input shaft to rotate and transmit torque, and can also slide axially along the input shaft of the shift gearbox 2 to switch the meshing state. The other end of the input shaft of the shift gearbox 2 is rotatably connected to a first support plate 203 through a bearing. A support plate 203 is fixedly installed inside the housing 201. The left and right sides of the first gear 202 mesh with the second gear 204 and the third gear 205, respectively. The second gear 204 is a double gear and is fixedly connected to one end of the first output shaft 206. The two ends of the first output shaft 206 are rotatably connected to the housing 201 via bearings. The other end of the first output shaft 206 is fixedly connected to a fourth gear 207, which meshes with a fifth gear 208. The fifth gear 208 is fixedly connected to a second output shaft 209. One end of the second output shaft 209 is rotatably connected to the second support plate 210 via a bearing, and the other end of the second output shaft 209 is rotatably connected to the second support plate 210 via a bearing. The first output shaft 206 is movably connected to the housing 201. The second support plate 210 is fixedly installed inside the housing 201. The first output shaft 206 passes through a through hole in the lower part of the second support plate 210 and penetrates the lower part of the second support plate 210. The second output shaft 209 is arranged parallel to the first output shaft 206 directly above it. The third gear 205 is fixedly connected to one end of the third output shaft 211. The two ends of the third output shaft 211 are rotatably connected to the housing 201 through bearings. The other end of the third output shaft 211 is fixedly connected to the sixth gear 212. The sixth gear 212 meshes with the seventh gear 213. The seventh gear 213 is fixedly connected to the fourth output shaft 214. The two ends of 14 are rotatably connected to the housing 201 via bearings. The fourth output shaft 214 is arranged parallel to and directly above the third output shaft 211. The first gear 202, the second gear 204, and the third gear 205 all have the same module but different numbers of teeth. The fourth gear 207, the fifth gear 208, the sixth gear 212, and the seventh gear 213 all have the same module and number of teeth, resulting in different transmission ratios between the first output shaft 206 and the third output shaft 211, thereby achieving different linear velocities between the first and second passes of the rolling mill. A shifting mechanism 215 is installed on the upper part of the first support plate 203 to switch the meshing state of the first gear 202. The shifting mechanism 215 includes a shifting hydraulic cylinder 2151.The piston rod of the shift hydraulic cylinder 2151 is fixedly connected to one end of the telescopic hydraulic rod 2152. The axis of the telescopic hydraulic rod 2152 is parallel and located directly above the input shaft. The other end of the telescopic hydraulic rod 2152 is fixedly connected to a shift fork 2153. The shift fork 2153 pushes the first gear 202 to move axially back and forth. The shift fork 2153 is U-shaped, and its two arms are respectively embedded in the annular grooves 2154 opened at the left and right ends of the first gear 202, for pushing the first gear 202 to move axially back and forth along the input shaft. The output shaft of the shift gearbox 2 extends out of the housing and is fixedly connected to the rolls of the variable thickness rolling mill 3. The variable thickness rolling mill 3 includes a frame 301, and a roll is arranged inside the frame 301. Two sets of parallel and spaced-apart first roll systems 302 and second roll systems 303 are provided. The first roll system 302 consists of a lower roll 3021 and an upper roll 3022. The two roll systems are arranged sequentially along the material feeding direction. The second roll system 303 consists of a lower roll 3031 and an upper roll 3032. The lower roll 3021 is fixedly connected to the first output shaft 206. Both ends of the lower roll 3021 are supported and fixed to the frame 301 by bearing seats. The shaft end of the lower roll 3021 extends out of the frame 301 and is fixedly connected to the first output shaft 206 by a coupling. It is driven to rotate by the first output shaft 206. The upper roll 3021... The shaft end of roll 022 extends out of frame 301 and is fixedly connected to the second output shaft 209 via a coupling, and is driven to rotate by the second output shaft 209. Both ends of the lower roll 3031 of the second roll system are supported and fixed to frame 301 by bearing seats. The shaft end of the lower roll 3031 extends out of frame 301 and is fixedly connected to the third output shaft 211 via a cross shaft coupling, and is driven to rotate by the third output shaft 211. Both ends of the upper roll 3032 of the second roll system are supported on frame 301 by bearing seats, whose bearing seats cooperate with the slide plate of frame 301, allowing vertical movement. The shaft end of the upper roll 3032 extends out of frame 301 and is fixedly connected to the fourth output shaft 214 via a cross shaft coupling. A fixed connection is established, driven to rotate by the fourth output shaft 214. A pressing drive 304 is mounted on the frame 301. The output end of the pressing drive 304 is connected to the bearing seat of the rolls on the second roll system 303, and is used to drive the rolls 3032 on the second roll system to move vertically, thereby adjusting the pressing amount of the second roll system 303. The pressing drive 304 can be a manual pressing device or a hydraulic cylinder pressing device. When the pressing drive 304 is a hydraulic cylinder pressing device, the cylinder body of the hydraulic cylinder pressing device is fixed to the upper part of the frame 301, and the piston rod of the hydraulic cylinder pressing device is connected to the bearing seat of the rolls 3032 on the second roll system. When the pressing drive 304 is a manual pressing device, a worm gear mechanism is installed on the frame 301.The lower end of the worm gear is connected to the bearing housing. Through the extension, retraction, or rotation of the pressing drive 304, the rolls 3032 on the second roll system are driven to rise or fall vertically, thereby adjusting the pressing amount of the second pass.
[0017] Usage steps: S1, first gear: The shifting hydraulic cylinder 2151 is in the initial state, with its piston rod in the retracted position, driving the telescopic hydraulic rod 2152 and the shift fork 2153 to the initial working position. At this time, the first gear 202 disengages from the third gear 205 and only engages with the second gear 204. The transmission path between the first output shaft 206 and the third output shaft 211 is disconnected, and the second roller system 303 is in a follow-up state. At the same time, the roll gap between the first roller system 302 and the second roller system 303 is kept consistent, that is, the roll gap between the lower roll 3021 and the upper roll 3022 of the first roller system is equal to the roll gap between the lower roll 3031 and the upper roll 3032 of the second roller system, thus achieving equal thickness rolling. S2, second gear: In the stopped state, the shifting hydraulic cylinder 2151 drives the piston rod to extend, which in turn drives the telescopic hydraulic rod 2152 and the shift fork 2153 to move axially in the forward direction. The shift fork 2153 pushes the first gear 202 until the first gear 202 meshes with the second gear 204 and the third gear 205 at the same time. At this time, the shifting mechanism 215 switches to the second gear position. The pressing drive 304 is operated so that its output end presses down on the bearing seat of the second roll 3032. The second roll 3032 moves downward in the vertical direction, reducing the roll gap of the second roll 303. This makes the reduction of the second roll 303 less than that of the first roll 302, thus achieving variable thickness rolling with different linear velocities between the first roll 302 and the second roll 303.
[0018] The foregoing has shown and described the main features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.
[0019] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A variable thickness rolling mill, characterized in that, The gearbox includes a geared motor (1), the output shaft of which is fixedly connected to the input shaft of a gearbox (2). The gearbox (2) includes a housing (201), and a first gear (202) is disposed inside the housing (201). The first gear (202) is slidably disposed on the input shaft of the gearbox (2) via a spline. The other end of the input shaft of the gearbox (2) is rotatably connected to a first support plate (203), which is fixedly disposed inside the housing (201). The left and right sides of the first gear (202) are respectively connected to the input shaft of the gearbox (2). The second gear (204) meshes with the third gear (205). The second gear (204) is a double gear. The second gear (204) is fixedly connected to one end of the first output shaft (206). The other end of the first output shaft (206) is fixedly connected to the fourth gear (207). Both ends of the first output shaft (206) are rotatably connected to the housing (201). The fourth gear (207) meshes with the fifth gear (208). The fifth gear (208) is fixedly connected to the second output shaft (209). One end of the second output shaft (209) rotates. The second output shaft (209) is connected to the second support plate (210), and the other end of the second output shaft (209) is rotatably connected to the housing (201). The second support plate (210) is fixedly installed inside the housing (201). The second output shaft (209) is arranged parallel to the first output shaft (206) directly above it. The third gear (205) is fixedly connected to one end of the third output shaft (211). The other end of the third output shaft (211) is fixedly connected to the sixth gear (212). Both ends of the third output shaft (211) are rotatably connected to the housing (201). The sixth gear... (212) meshes with the seventh gear (213), the seventh gear (213) is fixedly connected to the fourth output shaft (214), the fourth output shaft (214) is arranged parallel to the third output shaft (211) directly above, the two ends of the fourth output shaft (214) are rotatably connected to the housing (201), the upper part of the first support plate (203) is equipped with a shifting mechanism (215) for switching the meshing state of the first gear (202), the output shaft of the shifting gear box (2) extends out of the housing (201) and is fixedly connected to the rolls of the variable thickness rolling device (3).
2. The variable thickness rolling equipment according to claim 1, characterized in that, The first gear (202) has the same module as the second gear (204) and the third gear (205), but the number of teeth is different. The fourth gear (207), the fifth gear (208), the sixth gear (212), and the seventh gear (213) have the same module and number of teeth.
3. The variable thickness rolling equipment according to claim 2, characterized in that, The shifting mechanism (215) includes a shifting hydraulic cylinder (2151), the piston rod of which is fixedly connected to one end of a telescopic hydraulic rod (2152). The axis of the telescopic hydraulic rod (2152) is parallel and located directly above the input shaft. The other end of the telescopic hydraulic rod (2152) is fixedly connected to a shift fork (2153), which pushes the first gear (202) to reciprocate axially.
4. The variable thickness rolling equipment according to claim 3, characterized in that, The shift fork (2153) is U-shaped, and the left and right ends of the first gear (202) are provided with annular grooves (2154) that cooperate with the shift fork (2153).
5. The variable thickness rolling equipment according to claim 4, characterized in that, The variable thickness rolling mill (3) includes a frame (301), within which are arranged two sets of parallel and spaced first roll systems (302) and second roll systems (303). The first roll system (302) consists of a lower roll (3021) and an upper roll (3022). The second roll system (303) consists of a lower roll (3031) and an upper roll (3032). The lower roll (3021) is fixedly connected to the first output shaft (206), and the upper roll (3022) is fixedly connected to the first output shaft (206). Two output shafts (209) are fixedly connected. The lower roll (3031) of the second roll system is fixedly connected to the third output shaft (211) through a cross shaft coupling. The upper roll (3032) of the second roll system is fixedly connected to the fourth output shaft (214) through a cross shaft coupling. A pressing drive (304) is installed on the frame (301). The output end of the pressing drive (304) is connected to the bearing seat of the upper roll of the second roll system (303) to drive the upper roll (3032) of the second roll system to move in the vertical direction to adjust the pressing amount of the second roll system (303).
6. The variable thickness rolling equipment according to claim 5, characterized in that, The pressing drive (304) is a manual pressing device or a hydraulic cylinder pressing device.
7. A rolling method for a variable thickness rolling mill, characterized in that, Using the variable thickness rolling equipment described in claim 6, Includes the following steps: S1, first gear: The shifting hydraulic cylinder (2151) is in the initial state, and its piston rod is in the retracted position, driving the telescopic hydraulic rod (2152) and the shift fork (2153) to the initial working position; at this time, the first gear (202) and the third gear (205) are disengaged, and only the second gear (204) is engaged. The transmission path between the first output shaft (206) and the third output shaft (211) is disconnected, and the second roller system (303) is in the follow-up state. At the same time, the roll gap between the first roller system (302) and the second roller system (303) is kept consistent, that is, the roll gap between the lower roll (3021) of the first roller system and the upper roll (3022) of the first roller system is equal to the roll gap between the lower roll (3031) of the second roller system and the upper roll (3032) of the second roller system, so as to achieve equal thickness rolling. S2, second gear: In the stopped state, the shifting hydraulic cylinder (2151) drives the piston rod to extend, which in turn drives the telescopic hydraulic rod (2152) and the shift fork (2153) to move in the forward direction along the axial direction. The shift fork (2153) pushes the first gear (202) until the first gear (202) meshes with the second gear (204) and the third gear (205) at the same time. At this time, the shifting mechanism (215) switches to the second gear position. The pressing drive (304) is operated to press down the bearing seat of the second roll (3032) on the second roll system. The second roll (3032) on the second roll system moves downward in the vertical direction, reducing the roll gap of the second roll system (303). This makes the pressing amount of the second roll system (303) less than the pressing amount of the first roll system (302), thus realizing variable thickness rolling with different linear velocities of the first roll system (302) and the second roll system (303).