A steel strip cold rolling and punching device

Abstract

The present disclosure relates to the technical field of steel strip punching, and provides a steel strip cold rolling and punching device, which comprises a bearing base for intermittently conveying a steel strip in a first direction, a punching station is arranged on the bearing base, a punching mechanism and a rolling mechanism are arranged above the bearing base in a second direction; the punching mechanism comprises a driving assembly and an upper die seat, a punch is arranged below the upper die seat, and the driving assembly is used for driving the upper die seat to move in a vertical direction; the rolling mechanism comprises an upper rolling wheel and a lower rolling wheel arranged on the upper and lower sides of the punching station, the upper rolling wheel and the lower rolling wheel are connected through a synchronous transmission assembly, and the synchronous transmission assembly can enable the upper rolling wheel and the lower rolling wheel to synchronously and relatively move, so as to form a pre-rolling on the steel strip corresponding to a target hole, the pre-rolling is symmetrical up and down and has the same shape as the target hole; one punching operation comprises a rolling process and a punching process. Through the pre-rolling, the manufacturing cost of the equipment and the operation energy consumption can be reduced, and the service life of the punch is prolonged.

Description

Technical Field

[0001] This disclosure relates to the field of steel strip processing technology, and more specifically, to the field of steel strip processing technology. Background Technology

[0002] In industries such as machining, automotive parts manufacturing, and building materials processing, steel strip perforation is a common processing technique. Most existing steel strip perforation equipment uses a stamping method, where a punch and die work together to shear and punch holes in the steel strip to create pre-set holes. As industrial products increasingly demand higher structural strength and processing precision, more and more production scenarios are adopting high-strength steel.

[0003] Because high-strength steel strips have high hardness and resistance to deformation, the punch, as the core component, must withstand a large load during the actual punching process. The punching resistance of the punch increases significantly, causing the punch to bear strong impact loads, compressive stresses, and friction during operation.

[0004] Existing steel strip punching equipment, when used with high-strength steel strips, is prone to accelerated wear, dulling of the cutting edge, and even breakage under long-term high-load conditions. This not only leads to a decrease in hole wall quality and an increase in burrs, but also affects the overall processing accuracy of the product. Furthermore, because the punching force required for steel strip punching is relatively large, significant vibration and impact effects are easily generated during the punching process. This causes slight deviations or vibrations in the steel strip during processing, resulting in a decrease in hole position accuracy and making it difficult to meet the requirements of high-precision processing scenarios.

[0005] Therefore, existing steel strip punching equipment generally suffers from technical problems such as short punch life, unstable hole processing quality, and insufficient punching accuracy when processing high-strength steel strips.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure. Summary of the Invention

[0007] The purpose of this disclosure is to provide a cold rolling punching device for steel strip, which solves the problems of short punch life, unstable hole processing quality and insufficient punching accuracy that are common in existing steel strip punching equipment when processing high-strength steel strip.

[0008] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part from practice of this disclosure.

[0009] To achieve this objective, the present invention adopts the following technical solution: A cold rolling punching device for steel strip includes a support base for intermittently conveying steel strip along a first direction, the support base having a punching station, and a punching mechanism and a rolling stamping mechanism arranged above the support base along a second direction. The punching mechanism includes a drive assembly and an upper die base. A punch is provided on the lower end face of the upper die base. The drive assembly is used to drive the upper die base to move along a second direction. The rolling mechanism includes an upper rolling wheel and a lower rolling wheel disposed on the upper and lower sides of the punching station. The upper rolling wheel and the lower rolling wheel can move synchronously relative to each other through a synchronous transmission component to form a pre-roll mark on the steel strip that is symmetrical in shape and size with the same as the target hole at the corresponding target hole. The movement trajectory of the punch is on the same straight line as the movement trajectories of the upper and lower printing wheels. A punching operation includes a printing process and a punching process. The drive component first drives the synchronous transmission component to run for the printing process, and then drives the punch to run for the punching process.

[0010] Optionally, it also includes a mounting base, the bearing base being disposed on the mounting base, and the punching mechanism further includes a lower die base and a middle die base being disposed sequentially above the mounting base from bottom to top in a vertical direction, the bearing base being fixed to the upper end face of the lower die base, the lower stamping wheel being movably disposed in the lower die base, the upper stamping wheel being disposed on the lower end face of the middle die base, the upper die base being located above the middle die base, and the punch being disposed on the lower end face of the upper die base; A fixed seat is also provided above the upper mold base. The fixed seat is connected to the mounting base by a fixed column. The driving component is provided on the fixed seat and is used to drive the upper mold base and the middle mold base to move up and down in the vertical direction.

[0011] Optionally, the drive assembly includes a hydraulic cylinder fixed to the fixed base, the telescopic end of the hydraulic cylinder being connected to the upper mold base, a connecting rod and a buffer rod being provided between the upper mold base and the middle mold base, the connecting rod being fixedly connected to the upper mold base and slidingly passing through the middle mold base, and the buffer rod being fixedly connected to the middle mold base and slidingly passing through the upper mold base.

[0012] Optionally, the lower die holder has a receiving cavity, the receiving cavity communicating with the upper end face of the lower die holder, the lower printing wheel is disposed in the receiving cavity, and the synchronous transmission assembly includes: A rack, one end of which is fixedly connected to the middle mold base, and the other end extends downward in the vertical direction and is movably inserted into the lower mold base; A gear is rotatably disposed in the receiving cavity, and the gear meshes with the rack. The lifting seat is slidably disposed in the receiving cavity, and the lifting seat meshes with the gear, and the lower printing wheel is fixed to the upper end of the lifting seat.

[0013] Optionally, the upper printing wheel, the lower printing wheel, and the punch are on the same axis in the vertical direction, which is the working axis, and the middle die base is provided with a station switching component; The workstation switching component is used to enable the upper and lower printing rollers to move synchronously relative to each other along the working axis during the printing process, and to stop the upper and lower printing rollers during the punching process, allowing only the punch to move along the working axis.

[0014] Optionally, the workstation switching component includes: A limiting ejector rod is fixedly installed on the lower mold base. A contact switch is provided at the position corresponding to the lower end face of the middle mold base at the top of the limiting ejector rod. The limiting ejector rod has a first state and a second state controlled by the contact switch. The height of the limiting ejector rod in the first state is lower than the height in the second state. A connecting rod locking part is provided in the middle mold base, which includes a sliding insert rod and a driving member, wherein the sliding insert rod is movably inserted into the connecting rod; During the printing process, the limiting rod is in the first state, and the sliding rod is inserted into the connecting rod. After the printing is completed, the contact switch is triggered, the limiting rod is in the second state, and the sliding rod disengages from the connecting rod.

[0015] Optionally, the upper printing roller is composed of two symmetrical pressure blocks, and the middle die base is provided with a sliding hole, in which the two pressure blocks are slidably disposed; During the punching stroke, the two pressure blocks can move in opposite directions within the plane of the middle die base to make way for the punch to create a punching channel.

[0016] Optionally, the top of the two pressure blocks is provided with symmetrical wedges, the lower end face of the upper mold base is fixedly connected with a fixing block, the punch is installed on the lower end face of the fixing block, and the lower end of the fixing block has two symmetrically arranged inclined surfaces, which respectively fit with the inclined surfaces of the two wedges.

[0017] Optionally, a discharge baffle is slidably disposed in the lower die holder. During the rolling stroke, the discharge baffle retracts inside the lower die holder, and the opening of the receiving cavity is open. During the punching stroke, the discharge baffle extends to close the opening of the receiving cavity.

[0018] A method for punching holes in steel strip, using the aforementioned cold-rolled steel strip punching device, includes the following steps: The pre-drilling position of the steel strip is transported to the drilling station using the bearing base, and the steel strip is positioned. Start the drive assembly and first drive the synchronous transmission assembly to run, thereby driving the upper and lower printing rollers to move synchronously, so as to form a pre-printed mark with the same shape as the target hole on the upper and lower sides of the pre-drilled position of the steel strip. After the rolling process is completed, the drive assembly drives the punch to punch holes at the pre-rolling area.

[0019] Compared with the prior art, the present invention has the following beneficial effects: In the cold rolling punching device for steel strip provided in this embodiment of the invention, the complete cycle of one punching operation is as follows: the supporting base intermittently transports the steel strip to the punching station and precisely clamps and fixes the steel strip through the clamps and positioning mechanism; when the drive component works, it drives the upper die base to move up and down in the vertical direction, first driving the synchronous transmission component to run, and through the synchronous transmission component, it drives the upper and lower rolling rollers to move synchronously relative to each other, and squeezes the upper and lower surfaces of the steel strip with a set pressure, thereby forming a pre-rolled mark on the upper and lower sides of the target hole position on the steel strip, which is symmetrical and has the same shape as the target hole; after the rolling is completed, the drive component continues to drive and stops the synchronous transmission mechanism, only driving the punch to move downward. The cutting edge of the punch accurately falls into the groove of the pre-rolled mark on the upper surface. Since this area has been weakened, the punch can make the crack expand and penetrate from the pre-rolled mark with a small force, and finally punch off the waste, completing high-quality punching. By pre-printing stress concentration grooves at the punching position, the fracture mechanism of the material is changed, which greatly reduces the force required for subsequent punching, significantly reducing equipment manufacturing costs and operating energy consumption. The reduction in punching force directly leads to a reduction in impact load, extrusion, and frictional wear on the punch. At the same time, the pre-printed grooves provide precise guidance and alignment for the punch, avoiding off-center loading and chipping, and greatly extending the service life of the punch.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0023] Figure 1 This is a schematic diagram of a steel strip cold rolling punching device.

[0024] Figure 2 This is a structural cross-sectional view of a steel strip cold rolling punching device.

[0025] Figure 3 This is a structural cross-sectional view of a bearing base in a cold rolling and punching device for steel strip.

[0026] Figure 4 This is a partial structural diagram of the middle die holder in a cold rolling punching device for steel strip, after cross-section.

[0027] Figure 5 This is a cross-sectional view of the overall structure of the middle die holder in a cold rolling punching device for steel strip.

[0028] Illustrations: 1. Mounting base; 2. Bearing base; 3. Punching mechanism; 31. Lower die base; 311. Receiving cavity; 32. Middle die base; 321. Sliding hole; 33. Upper die base; 331. Fixing block; 34. Fixing seat; 35. Drive assembly; 36. Fixing column; 37. Connecting rod; 38. Buffer rod; 39. Punch; 4. Printing mechanism; 41. Upper printing wheel; 411. Wedge block; 42. Lower printing wheel; 43. Synchronous transmission assembly; 431. Rack; 432. Gear; 433. Lifting seat; 5. Station switching assembly; 51. Limiting rod; 52. Connecting rod locking part; 521. Sliding insert rod; 522. Drive component; 53. Contact switch; 6. Discharge baffle. Detailed Implementation

[0029] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0030] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," 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. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0031] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] like Figures 1-5 As shown, this embodiment of the invention provides a cold-rolled steel strip punching device for punching high-strength steel strips. Due to the high strength of the steel strip, the punching process requires high punching pressure and high punch hardness, which can easily lead to low punching quality. Therefore, this invention aims to provide a punching device that can meet the high-precision and high-efficiency punching requirements of high-strength steel strips while ensuring the service life of the punch. Through structural improvements, this invention has at least the advantages of low operating energy consumption and high precision.

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, the cold rolling and punching device for steel strip includes a support base 2, a rolling mechanism 4, and a punching mechanism 3. The support base 2 is used for intermittently conveying and positioning the steel strip, and has a punching station on it; the punching mechanism 3 includes a drive assembly 35 and an upper die base 33, with a punch 39 disposed below the upper die base 33, and the drive assembly 35 is used to drive the upper die base 33 to move vertically; the rolling mechanism 4 includes an upper rolling wheel 41 and a lower rolling wheel 42 disposed on the upper and lower sides of the punching station, the upper rolling wheel 41 and the lower rolling wheel 42 are connected by a synchronous transmission assembly 43, and the synchronous transmission assembly 43 is connected to the upper die base 33. The synchronous transmission assembly 43 enables the upper printing roller 41 and the lower printing roller 42 to move synchronously relative to each other, so as to form a pre-printing mark on the steel strip that is symmetrical and has the same shape and size as the target hole at the corresponding target hole. The drive assembly 35 can drive the synchronous transmission assembly 43 to run and drive the punch 39 to punch through the upper die base 33. The punching operation includes the printing process and the punching process. The drive assembly 35 first drives the synchronous transmission assembly 43 to perform the printing process, and then drives the punch 39 to perform the punching process.

[0034] Specifically, the cold-rolled steel strip punching device can be integrated into the steel strip processing steps. After straightening the steel strip, it is continuously and intermittently fed by a feeding mechanism, and punched using a punching device. The feeding mechanism can precisely transport the steel strip, ensuring that the punching position on the steel strip is consistent with the cutting position of the punch 39, thus ensuring punching accuracy. Simultaneously, the punching device can also integrate a positioning mechanism for precise positioning and fixing of the steel strip, further ensuring punching accuracy. The feeding mechanism and positioning mechanism are relatively mature technologies in this field, and will not be elaborated upon further in this invention.

[0035] The supporting base 2 is used to intermittently convey steel strip along the first direction, thereby punching intermittent through holes on the steel strip. The supporting base 2 has a punching station, where through holes can be opened to facilitate the punching punch 39 to punch downwards. The upper die base 33 is set above the supporting base 2, and the driving component 35 is set above the upper die base 33 to drive the upper die base 33 to move in the vertical direction. The punch 39 is set on the lower end face of the upper die base 33. The upper printing wheel 41 and the lower printing wheel 42 are respectively set on the upper and lower sides of the punching station. When the synchronous transmission component 43 is running, it can be used to drive the upper printing wheel 41 and the lower printing wheel 42 to move synchronously relative to each other at the same speed and pressure. The upper printing wheel 41 and the lower printing wheel 42 have the same shape and size, and both have the same shape and size as the target hole, so that the pre-printed outline formed by the upper printing wheel 41 and the lower printing wheel 42 can coincide with the edge of the target hole.

[0036] The workflow of this invention embodiment is as follows: After the steel strip is positioned at the punching station, the drive assembly 35 is activated, driving the upper die holder 33 to move downwards for punching. A complete punching process includes two stages: the rolling process and the punching process. When the upper die holder 33 moves downwards, it first drives the upper rolling roller 41 to descend together, and simultaneously drives the synchronous transmission assembly 43 to run, thereby driving the lower rolling roller 42 to move upwards synchronously. Thus, the upper rolling roller 41 and the lower rolling roller 42 apply pressure to the upper and lower surfaces of the steel strip simultaneously, rolling out two pre-rolled marks that are symmetrical and have the same shape as the target hole. After the rolling is completed, the upper die holder 33 resets and moves downwards again. The upper rolling roller 41 and the lower rolling roller 42 stop running, and the punch 39 moves downwards synchronously with the upper die holder 33. The cutting edge of the punch 39 accurately falls into the groove of the pre-rolled mark on the upper surface. Since this area has been weakened, the punch 39 can cause the crack to expand and penetrate from the pre-rolled mark with a small force, finally knocking off the waste material and completing high-quality punching. By pre-printing stress concentration grooves at the punching position, the fracture mechanism of the material is changed, which greatly reduces the force required for subsequent punching, significantly reducing equipment manufacturing costs and operating energy consumption. The reduction in punching force directly leads to a reduction in impact load, extrusion, and frictional wear on the punch 39. At the same time, the pre-printed grooves provide precise guidance and alignment for the punch 39, avoiding off-center loading and chipping, and greatly extending the service life of the punch 39.

[0037] like Figure 1 , Figure 2 and Figure 3 As shown, the cold rolling punching device for steel strip further includes a mounting base 1, a bearing base 2 is mounted on the mounting base 1, and the punching mechanism 3 includes a lower die base 31 and a middle die base 32 arranged vertically from bottom to top above the mounting base 1. The bearing base 2 is fixed to the upper end face of the lower die base 31, the lower stamping wheel 42 is movably mounted in the lower die base 31, the upper stamping wheel 41 is located on the lower end face of the middle die base 32, the upper die base 33 is located above the middle die base 32, and the punch 39 is located on the lower end face of the upper die base 33. A fixed seat 34 is also provided above the upper die base 33. The fixed seat 34 is connected to the mounting base 1 through a fixed column 36, and the driving assembly 35 is located on the fixed seat 34 for driving the upper die base 33 and the middle die base 32 to move up and down vertically.

[0038] Furthermore, the drive assembly 35 includes a hydraulic cylinder fixed to the fixed base 34. The telescopic end of the hydraulic cylinder is connected to the upper mold base 33. A connecting rod 37 and a buffer rod 38 are provided between the upper mold base 33 and the middle mold base 32. The connecting rod 37 is fixedly connected to the upper mold base 33 and slides through the middle mold base 32. The buffer rod 38 is fixedly connected to the middle mold base 32 and slides through the upper mold base 33.

[0039] Specifically, the mounting base 1 is the bottom foundation support base, and the fixed base 34 is the top support base. Multiple fixed columns 36 are fixedly installed between the fixed base 34 and the mounting base 1 to form a stable equipment frame. The lower die base 31 is fixedly installed on the mounting base 1, and the bearing base 2 is fixedly installed above the lower die base 31. The steel strip is placed on the bearing base 2, which has through holes for punching waste to fall off. The drive assembly 35 is specifically a hydraulic cylinder, which is fixed on the fixed base 34. Its piston rod passes through the fixed base 34 and is fixedly connected to the upper die base 33. The middle die base 32 is located between the upper die base 33 and the lower die base 31, and the middle die base 32 is connected to the upper die base 33 through a connecting rod 37. Meanwhile, the upper part of the connecting rod 37 is fixedly connected to the upper mold base 33, and the lower part slides through the middle mold base 32, so that the middle mold base 32 can slide up and down relative to the upper mold base 33; the lower part of the buffer rod 38 is fixedly connected to the middle mold base 32, and the upper part slides through the upper mold base 33. A spring can be sleeved on the buffer rod 38, with one end of the spring abutting against the middle mold base 32 and the other end abutting against the upper mold base 33.

[0040] Understandably, since the upper stamping wheel 41 is located on the lower end face of the intermediate die holder 32, and the punch 39 is located on the lower end face of the upper die holder 33, if the intermediate die holder 32 and the upper die holder 33 are fixed, when the drive assembly 35 drives the upper die holder 33 downward, the intermediate die holder 32 will move downward synchronously, and the upper stamping wheel 41 will approach the bearing base 2 first, thus enabling stamping. If the intermediate die holder 32 can slide relative to the upper die holder 33, then when the drive assembly 35 drives the upper die holder 33 downward, fixing the position of the intermediate die holder 32 allows the upper die holder 33 to move downward independently and approach the intermediate die holder 32. The punch 39 can then pass through the intermediate die holder 32 and approach the bearing base 2 first, thus enabling punching. This achieves the goal of stamping before punching, and stamping and punching can be completed on the same axis, which helps ensure the accuracy of punching.

[0041] For example, a switching mechanism can be provided on the middle die holder 32. The switching mechanism can switch the upper printing wheel 41 through the vertical guide rail, so that the upper printing wheel 41 moves towards the edge of the middle die holder 32 when punching, making way for the punch 39 to go down and pass through the middle die holder 32.

[0042] like Figure 2 and Figure 3 As shown, in this embodiment of the invention, the lower die holder 31 has a receiving cavity 311, which is connected to the upper end face of the lower die holder 31. The lower printing wheel 42 is disposed in the receiving cavity 311. The synchronous transmission assembly 43 includes a rack 431, a gear 432, and a lifting seat 433. One end of the rack 431 is fixedly connected to the middle die holder 32, and the other end extends downward in the vertical direction and is movably inserted into the lower die holder 31. The gear 432 is rotatably disposed in the receiving cavity 311 and meshes with the rack 431. The lifting seat 433 is slidably disposed in the receiving cavity 311 and meshes with the gear 432. The lower printing wheel 42 is fixed to the upper end of the lifting seat 433.

[0043] Specifically, the lower mold base 31 has an internal receiving cavity 311 that extends upward to the upper end face of the lower mold base 31 and corresponds to the through hole on the bearing base 2. The receiving cavity 311 extends symmetrically to both sides at the bottom. Two racks 431 can be symmetrically arranged. The upper end of the rack 431 is fixedly connected to the middle mold base 32. Therefore, when the middle mold base 32 moves, it can drive the rack 431 to move synchronously. The other end of the rack 431 extends vertically downward and is movably inserted into the lower mold base 31. One side of the teeth of the rack 431 is located in the receiving cavity 311. The gear 432 is rotatably installed in the receiving cavity 311 through a rotating shaft and bearings. Each rack 431 is meshed with a corresponding gear 432. The lifting seat 433 is a T-shaped block that is slidably arranged in the receiving cavity 311. Its sliding direction is vertical. The side of the lifting seat 433 facing the gear 432 is machined with teeth so that it meshes with the gear 432. The lower printing roller 42 is fixedly installed on the upper end of the lifting base 433. When the lifting base 433 rises, it can drive the lower printing roller 42 to move towards the bearing base 2. Through the synchronous transmission assembly 43, it is ensured that when the upper printing roller 41 moves downward, the lower printing roller 42 can move at the same speed relative to it, ensuring that the upper and lower printing forces are uniform and symmetrical.

[0044] In one embodiment of the present invention, the upper printing wheel 41, the lower printing wheel 42, and the punch 39 are on the same axis in the vertical direction. This axis is the working axis. A station switching component 5 is provided on the middle die base 32. The station switching component 5 is used to make the upper printing wheel 41 and the lower printing wheel 42 move synchronously relative to each other along the working axis during the printing process, and to stop the upper printing wheel 41 and the lower printing wheel 42 during the punching process, allowing only the punch 39 to run along the working axis.

[0045] The station switching component 5 enables the upper printing roller 41 and the lower printing roller 42 to be in different motion states during different work processes, so that printing and punching can be completed at the same station. Both can be achieved by driving the upper die holder 33 downward in the vertical direction through the drive component 35, ensuring that the printing position and the punching position are completely coincident, thereby reducing the punching pressure of the punch 39 while ensuring the punching accuracy.

[0046] like Figure 4 and Figure 5 As shown, the workstation switching component 5 further includes: The limiting ejector rod 51 is fixedly installed on the lower mold base 31. A contact switch 53 is provided at the position corresponding to the lower end face of the middle mold base 32. The limiting ejector rod 51 has a first state and a second state controlled by the contact switch 53. The height of the limiting ejector rod 51 in the first state is lower than the height in the second state. The connecting rod locking part 52 is provided in the middle mold base 32, and includes a sliding insert 521 and a driving member 522. The sliding insert 521 is movably inserted into the connecting rod 37. During the rolling process, the limit rod 51 is in the first state, and the sliding rod 521 is inserted into the connecting rod 37. After the rolling is completed, the contact switch 53 is triggered, the limit rod 51 is in the second state, and the sliding rod 521 is disengaged from the connecting rod 37.

[0047] Specifically, a limiting ejector rod 51 is fixedly mounted on the upper end face of the lower die holder 31. The limiting ejector rod 51 is telescopic, allowing its top height to change. A contact switch 53 is mounted on the top of the lower end face of the middle die holder 32, with its contacts located at the end of the limiting ejector rod 51. When the contacts at the top of the limiting ejector rod 51 contact the contact switch 53 and separate, the limiting ejector rod 51 is activated for height adjustment. The height of the limiting ejector rod 51 has a first state and a second state. In the first state, the top height of the limiting ejector rod 51 is lower; in the second state, the top of the limiting ejector rod 51 extends to a preset height. The limiting ejector rod 51 serves as a limiting support for the middle die holder 32, allowing the middle die holder 32 to be fixed in the corresponding position during different strokes, facilitating switching between different workstations and ensuring that the rolling and punching workstations are on the same axis.

[0048] Meanwhile, the sliding insert 521 is slidably disposed inside the intermediate mold base 32 and inserted into the corresponding pin hole on the connecting rod 37, thereby rigidly locking the intermediate mold base 32 and the connecting rod 37 together; the driving component 522 may include a screw and a motor movably inserted into the sliding insert 521. When the motor starts, it drives the screw to rotate, thereby driving the sliding insert 521 to move along the length direction, and thus it can disengage from the connecting rod 37 or be inserted into the connecting rod 37. The starting of the motor can be controlled by the contact switch 53.

[0049] For example, before a punching operation, the limiting rod 51 is in the first state, and the middle die holder 32 and the upper die holder 33 are locked. When the rolling stroke is performed, the middle die holder 32 and the upper die holder 33 move down synchronously, and the upper rolling roller 41 and the lower rolling roller 42 move closer to each other synchronously and roll on the steel strip. When the rolling depth reaches the set depth, the lower end face of the middle die holder 32 abuts against the top of the limiting rod 51, and the contact switch 53 contacts the contact point. When the middle die holder 32 moves up, the contact switch 53 is triggered, the limiting rod 51 is activated, and the middle die holder 32 reaches the second state after resetting. When punching, the middle die holder 32 and the upper die holder 33 are unlocked and can slide relative to each other. When the middle die holder 32 moves down, its lower end face abuts against the top of the limiting rod 51 to fix the position of the middle die holder 32, while the upper die holder 33 can continue to move down, and the punch 39 can pass through the middle die holder 32 to punch.

[0050] like Figure 2 , Figure 4 and Figure 5 As shown, in this embodiment of the invention, the upper stamping wheel 41 is composed of two symmetrical pressure blocks, and the middle die base 32 is provided with a sliding hole 321. The two pressure blocks are slidably disposed in the sliding hole 321. During the punching stroke, the two pressure blocks can move in opposite directions in the plane where the middle die base is located, making way for the punch 39 to punch the channel.

[0051] Furthermore, symmetrical wedges 411 are provided on the top of the two pressure blocks, and a fixing block 331 is fixedly connected to the lower end face of the upper mold base 33. The punch 39 is installed on the lower end face of the fixing block 331. The lower end of the fixing block 331 has two symmetrically arranged inclined surfaces, and the two inclined surfaces are respectively in contact with the inclined surfaces of the two wedges 411.

[0052] Specifically, the upper stamping wheel 41 is symmetrically composed of two pressure blocks of the same shape and size. The middle die base 32 has a sliding hole 321 that runs through its upper and lower end faces. The two pressure blocks are slidably disposed in the sliding hole 321. The sliding direction of the pressure blocks is in the horizontal plane, and they move towards or away from each other. Thus, when the two pressure blocks move away from each other, the center of the sliding hole 321 can be made to be connected vertically, so that the punch 39 can pass through.

[0053] Meanwhile, a wedge 411 is provided on the top of the pressure block, with two wedges 411 arranged symmetrically. Each wedge 411 has an inclined guide surface machined on it. A fixing block 331 is fixedly connected to the lower end face of the upper die base 33. The punch 39 is installed at the center of the lower end face of the fixing block 331. Two symmetrically arranged inclined surfaces are formed on both sides of the lower part of the fixing block 331, and the two inclined surfaces are respectively in contact with the inclined surfaces on the wedges 411. In addition, the wedges 411 can be slidably disposed in the sliding hole 321 by means of a guide post. The guide post is movably inserted into the middle die base 32. A return spring can be sleeved on the guide post so that the two pressure blocks can be reset when there is no lateral sliding force, so as to form a complete upper printing wheel 41.

[0054] During the rolling process, the middle die holder 32 and the upper die holder 33 are relatively fixed, and the inclined surface of the fixing block 331 is in contact with the inclined surface of the wedge block 411, and the position is fixed. During the punching process, the middle die holder 32 and the upper die holder 33 are unlocked. When the middle die holder 32 moves downward, it is limited by the limiting rod 51, so the height no longer changes. The upper die holder 33 continues to move downward, and the inclined surface of the fixing block 331 presses against the inclined surface of the wedge block 411, thereby driving the two pressure blocks to move in opposite directions, forming a punching channel through which the punch 39 can pass, so that the punch 39 can move vertically downward along the working axis and punch at the pre-rolling position, which helps to ensure the accuracy of punching.

[0055] For example, a discharge baffle 6 is slidably disposed in the lower die base 31. During the rolling stroke, the discharge baffle 6 retracts inside the lower die base 31, leaving the opening of the receiving cavity 311 open. During the punching stroke, the discharge baffle 6 extends to close the opening of the receiving cavity 311. For example, the discharge baffle 6 can be moved by an electric push rod or a cylinder, and the activation state of the electric push rod or cylinder can be controlled by a contact switch 53. During the rolling stroke, the discharge baffle 6 retracts inside the lower die base 31, leaving the upper opening of the receiving cavity 311 open to allow the lower rolling roller 42 to rise. During the punching stroke, the discharge baffle 6 closes the upper opening of the receiving cavity 311, thereby preventing the waste material generated during punching from falling into the receiving cavity 311 or contacting the lower rolling roller 42. The punching waste material can be discharged along the discharge baffle 6.

[0056] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0057] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A steel strip cold rolling punching device, characterized in that, It includes a bearing base (2) for intermittently conveying steel strips along a first direction, the bearing base (2) having a punching station, and a punching mechanism (3) and a rolling mechanism (4) arranged above the bearing base along a second direction; The punching mechanism (3) includes a drive assembly (35) and an upper die base (33). A punch (39) is provided on the lower end face of the upper die base (33). The drive assembly (35) is used to drive the upper die base (33) to move along the second direction. The rolling mechanism (4) includes an upper rolling wheel (41) and a lower rolling wheel (42) disposed on the upper and lower sides of the punching station. The upper rolling wheel (41) and the lower rolling wheel (42) can move synchronously relative to each other through a synchronous transmission assembly (43) to form a pre-rolled mark on the steel strip that is symmetrical in shape and size with the same as the target hole at the corresponding target hole. The movement trajectory of the punch (39) is on the same straight line as the movement trajectory of the upper printing wheel (41) and the lower printing wheel (42). A punching operation includes a printing process and a punching process. The drive component (35) first drives the synchronous transmission component (43) to run for the printing process, and then drives the punch (39) to run for the punching process. The punching mechanism (3) further includes a lower die base (31) and a middle die base (32). The bearing base (2) is fixed to the upper end face of the lower die base (31). The lower printing wheel (42) is movably disposed in the lower die base (31). A connecting rod (37) is provided between the upper die base (33) and the middle die base (32). The connecting rod (37) is fixedly connected to the upper die base (33) and slides through the middle die base (32). The upper printing wheel (41), the lower printing wheel (42), and the punch (39) are on the same axis in the vertical direction. This axis is the working axis. The middle die holder (32) is provided with a station switching component (5). The station switching component (5) includes: A limiting ejector rod (51) is fixedly installed on the lower mold base (31). A contact switch (53) is provided at the position corresponding to the lower end face of the middle mold base (32) on the top of the limiting ejector rod (51). The limiting ejector rod (51) has a first state and a second state controlled by the contact switch (53). The height of the limiting ejector rod (51) in the first state is lower than the height in the second state. A connecting rod locking part (52) is provided in the middle mold base (32), which includes a sliding insert (521) and a driving member (522). The sliding insert (521) is movably inserted into the connecting rod (37). During the rolling process, the limiting top rod (51) is in the first state, the sliding insert rod (521) is inserted into the connecting rod (37), and after the rolling is completed, the contact switch (53) is triggered, the limiting top rod (51) is in the second state, and the sliding insert rod (521) is disengaged from the connecting rod (37).

2. The cold rolling and punching device for steel strip according to claim 1, characterized in that, It also includes a mounting base (1), the bearing base (2) is disposed on the mounting base (1), the upper printing wheel (41) is disposed on the lower end face of the middle die base (32), the upper die base (33) is located above the middle die base (32), and the punch (39) is disposed on the lower end face of the upper die base (33); A fixed seat (34) is also provided above the upper mold base (33). The fixed seat (34) is connected to the mounting base (1) by a fixed column (36). The driving component (35) is provided on the fixed seat (34) and is used to drive the upper mold base (33) and the middle mold base (32) to move up and down in the vertical direction.

3. The cold rolling and punching device for steel strip according to claim 2, characterized in that, The drive assembly (35) includes a hydraulic cylinder fixed on the fixed base (34), the telescopic end of the hydraulic cylinder is connected to the upper mold base (33), and a buffer rod (38) is also provided between the upper mold base (33) and the middle mold base (32). The buffer rod (38) is fixedly connected to the middle mold base (32) and slides through the upper mold base (33).

4. The cold rolling and punching device for steel strip according to claim 3, characterized in that, The lower die holder (31) has a receiving cavity (311) that is connected to the upper end face of the lower die holder (31). The lower printing roller (42) is disposed in the receiving cavity (311). The synchronous transmission assembly (43) includes: A rack (431), one end of which is fixedly connected to the middle mold base (32), and the other end extends downward in the vertical direction and is movably inserted into the lower mold base (31); A gear (432) is rotatably disposed in the receiving cavity (311), and the gear (432) meshes with the rack (431); The lifting seat (433) is slidably disposed in the receiving cavity (311), and the lifting seat (433) meshes with the gear (432), and the lower printing wheel (42) is fixed to the upper end of the lifting seat (433).

5. The cold rolling and punching device for steel strip according to claim 3, characterized in that, The workstation switching component (5) is used to make the upper printing roller (41) and the lower printing roller (42) move synchronously relative to each other along the working axis during the printing process, and to stop the upper printing roller (41) and the lower printing roller (42) during the punching process, allowing only the punch (39) to run along the working axis.

6. The cold rolling and punching apparatus for steel strip according to claim 5, characterized in that, The upper printing wheel (41) is composed of two symmetrical pressure blocks. The middle mold base (32) is provided with a sliding hole (321), and the two pressure blocks are slidably disposed in the sliding hole (321). During the punching stroke, the two pressure blocks can move in opposite directions in the plane of the middle die base (32) to make way for the punch (39) to punch the hole.

7. The cold rolling and punching apparatus for steel strip according to claim 6, characterized in that, The top of the two pressure blocks is provided with symmetrical wedges (411), the lower end face of the upper mold base (33) is fixedly connected with a fixing block (331), the punch (39) is installed on the lower end face of the fixing block (331), the lower end of the fixing block (331) has two symmetrically arranged inclined surfaces, and the two inclined surfaces are respectively in contact with the inclined surfaces of the two wedges (411).

8. The cold rolling and punching apparatus for steel strip according to claim 4, characterized in that, A discharge baffle (6) is slidably disposed in the lower die base (31). During the rolling stroke, the discharge baffle (6) retracts inside the lower die base (31), and the opening of the receiving cavity (311) is open. During the punching stroke, the discharge baffle (6) extends to close the opening of the receiving cavity (311).

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