An inner ring flattening device for forging bearing rings
By designing an inner ring flattening device for bearing ring forging that combines lateral translation components and vertical translation components, the problem of bearing ring position offset after stamping is solved, and stamping efficiency and staff safety are improved.
Patent Information
- Application Number
- CN202411686347.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2044-11-25
AI Technical Summary
During the forging and processing of bearing rings, the impact force of the stamping equipment is relatively large, resulting in the offset of the bearing ring position after each stamping, and manual handheld fixtures are required for correction, which is inefficient and affects the safety of the staff.
An inner ring flattening equipment for forging bearing rings is designed, using an inverted U-shaped fixing frame, a disc-shaped bearing stage and an electric telescopic rod. Combined with a lateral translation component and a vertical translation component, the automatic adjustment of the bearing ring position is achieved through the cooperation of the sliding part, the adjustment part and the push plate.
It improves stamping efficiency, reduces the need for manual correction, enhances the safety of staff, and ensures the stable position of the bearing ring during stamping.
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Figure CN119175318B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of forging equipment, and in particular, to an inner ring flattening device for forging bearing rings. Background Art
[0002] A bearing is a relatively important part in current machinery. There are many processes in the machining of bearings, and turning the bearing is a key machining process. A bearing ring is an important component of a bearing. Different bearings have different shapes of their outer bearing rings, and forging is required when machining the bearings.
[0003] When forging and machining a bearing ring, it is necessary to flatten the bearing, so stamping equipment is required to process the bearing ring. Currently, when stamping and machining a bearing ring, the bearing ring is placed on the surface of a stamping table, and the stamping equipment intermittently performs continuous stamping on it.
[0004] The impact force of the stamping equipment is relatively large. After a single stamping, the position of the bearing ring on the surface of the stamping table will shift. Therefore, during each stamping interval, it is necessary for a worker to hold a fixture by hand to correct the position of the bearing ring, which not only has a low stamping efficiency but also affects the personal safety of the worker. Summary of the Invention
[0005] The purpose of the present invention is to provide an inner ring flattening device for forging bearing rings to solve the problems raised in the above background art.
[0006] To achieve the above purpose, the present invention provides the following technical solutions:
[0007] An inner ring flattening device for forging a bearing ring, comprising a workbench, on the surface of which a fixing frame is fixedly installed. The fixing frame is of an inverted U-shaped structure. A bearing platform is fixedly installed on the surface of the workbench. The bearing platform is of a disc-shaped structure. A flattening assembly cooperating with the bearing platform is arranged on the surface of the fixing frame. The flattening assembly includes an electric telescopic rod fixedly installed on the inner top wall of the fixing frame. The telescopic end of the electric telescopic rod is fixedly installed with a cross plate, and a stamping block is fixedly installed on the bottom wall of the cross plate. A positioning mechanism is arranged on the surface of the bearing platform. The positioning mechanism includes a push plate, a horizontal translation assembly and a vertical translation assembly. A plurality of groups of push plates are arranged and distributed annularly on the surface of the bearing platform. The horizontal translation assembly includes a sliding part and an adjusting part. The sliding part is located inside the bearing platform and is connected to the push plate. The adjusting part is connected to the sliding part. When the cross plate moves upward in the vertical direction, the adjusting part controls the push plate to move synchronously along the radial direction of the bearing platform by cooperating with the sliding part. The vertical translation assembly is connected to the push plate. When the push plate moves along the radial direction of the bearing platform, the vertical translation assembly controls the push plate to move synchronously in the vertical direction. When the push plate moves from the periphery of the bearing platform towards the center of the bearing platform, the vertical translation assembly controls the push plate to move from inside the bearing platform to above the bearing platform.
[0008] As a further scheme of the present invention: The sliding part includes a plurality of groups of annularly distributed sliding grooves opened inside the bearing platform. A connecting groove communicating with the sliding groove is opened downward on the surface of the bearing platform. A sliding block is slidably installed in the sliding groove. The push plate is arranged on the surface of the sliding block. One end of the sliding groove close to the center of the bearing platform is fixedly installed with a compression spring. The telescopic end of the compression spring is connected to the sliding block. One end of the sliding groove close to the bearing platform is inwardly opened with a wire groove extending to the outside of the bearing platform. A vertical rod is fixedly installed between the top wall of the fixing frame and the workbench. A control rope is fixedly installed on the side wall of the sliding block. One end of the control rope away from the sliding block passes through the wire groove and extends to the outside of the bearing platform and is fixedly installed with a control block. The control block is made of a magnetic material. The control block is slidably connected to the vertical rod in the vertical direction. A magnetic block cooperating with the control block is fixedly installed on the bottom wall of the cross plate.
[0009] As a further scheme of the present invention: The adjusting part includes a telescopic cavity opened inside the bearing platform and communicating with the wire groove. The control rope passes through the telescopic cavity. The control rope is divided into two sections in the telescopic cavity. One end of the control rope located in the telescopic cavity is fixedly installed with a first telescopic block. The other end of the control rope located in the telescopic cavity is fixedly installed with a second telescopic block. A buffer spring is connected between the first telescopic block and the second telescopic block.
[0010] As a further solution of the present invention: The vertical translation component includes a vertical groove opened downward on the surface of the sliding block. The push plate is slidably installed in the vertical groove in the vertical direction. Lateral grooves communicating with the vertical groove are respectively opened on the opposite side walls of the sliding block. A guiding groove is opened on the side wall of the slideway. A guiding column is fixedly installed on the side wall of the push plate. The guiding column passes through the lateral groove and is inserted into the guiding groove. The guiding groove is of a broken-line structure and includes a bottom groove, a connecting groove and a top groove. The two ends of the connecting groove are respectively communicated with the bottom groove and the top groove.
[0011] As a further solution of the present invention: A roller cooperating with the control rope is rotatably installed in the wire groove.
[0012] As a further solution of the present invention: A damping spring surrounding the vertical rod and cooperating with the control block is fixedly installed on the surface of the workbench.
[0013] As a further solution of the present invention: The cross plate and the vertical rod are slidably connected in the vertical direction.
[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: When the cross plate and the stamping block move vertically for stamping, by arranging the horizontal translation component composed of a sliding part and an adjusting part to cooperate with the vertical translation component, the positions of multiple push plates can be conveniently adjusted. The multiple push plates can adjust the position of the bearing race on the surface of the bearing platform, which can effectively improve the stamping efficiency. It solves the problem that at present, it is necessary to manually hold a fixture to correct the position of the bearing race, which not only has a low stamping efficiency but also affects the personal safety of the staff. Description of the Drawings
[0015] Figure 1 It is a three-dimensional structural schematic diagram of an inner ring flattening device for forging bearing races provided in an embodiment of the present invention.
[0016] Figure 2 It is a front view structural schematic diagram of an inner ring flattening device for forging bearing races provided in an embodiment of the present invention.
[0017] Figure 3 It is a schematic diagram of the sliding block and its connection structure in an inner ring flattening device for forging bearing races provided in an embodiment of the present invention.
[0018] Figure 4 It is Figure 2 The enlarged structural schematic diagram of A in
[0019] Figure 5 It is Figure 2 The enlarged structural schematic diagram of B in
[0020] Wherein: 1 - workbench, 2 - fixing frame, 3 - bearing platform, 4 - flattening component, 41 - electric telescopic rod, 42 - cross plate, 43 - stamping block, 5 - positioning mechanism, 51 - push plate, 52 - horizontal translation component, 521 - sliding part, 5211 - slideway, 5212 - connecting groove, 5213 - sliding block, 5214 - extrusion spring, 5215 - wire groove, 5216 - vertical rod, 5217 - control block, 5218 - magnetic block, 5219 - control rope, 522 - adjusting part, 5221 - telescopic cavity, 5222 - first telescopic block, 5223 - second telescopic block, 5224 - buffer spring, 53 - vertical translation component, 531 - vertical groove, 532 - lateral groove, 533 - guiding column, 534 - guiding groove, 5341 - bottom groove, 5342 - communicating groove, 5343 - top groove, 6 - roller, 7 - shock absorption spring. Detailed implementation mode
[0021] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.
[0022] The following describes in detail the specific implementation of the present invention in combination with specific embodiments.
[0023] As Figure 1 、 Figure 2 、 Figure 4 shown, the structural diagram of an inner ring flattening device for forging bearing rings provided by an embodiment of the present invention includes a workbench 1, a fixing frame 2 is fixedly installed on the surface of the workbench 1, the fixing frame 2 is of an inverted U-shaped structure, a bearing platform 3 is fixedly installed on the surface of the workbench 1, the bearing platform 3 is of a disc-shaped structure, and a flattening component 4 matching with the bearing platform 3 is arranged on the surface of the fixing frame 2. The flattening component 4 includes an electric telescopic rod 41 fixedly installed on the inner top wall of the fixing frame 2, a cross plate 42 is fixedly installed at the telescopic end of the electric telescopic rod 41, and a stamping block 43 is fixedly installed on the bottom wall of the cross plate 42. A positioning mechanism 5 is arranged on the surface of the bearing platform 3. The positioning mechanism 5 includes a push plate 51, a horizontal translation component 52 and a vertical translation component 53. Multiple groups of push plates 51 are arranged and distributed in a ring shape on the surface of the bearing platform 3. The horizontal translation component 52 includes a sliding part 521 and an adjusting part 522. The sliding part 521 is located inside the bearing platform 3 and is connected to the push plate 51. The adjusting part 522 is connected to the sliding part 521. When the cross plate 42 moves upward in the vertical direction, the adjusting part 522 controls the push plate 51 to move synchronously along the radial direction of the bearing platform 3 by cooperating with the sliding part 521. The vertical translation component 53 is connected to the push plate 51. When the push plate 51 moves along the radial direction of the bearing platform 3, the vertical translation component 53 controls the push plate 51 to move synchronously in the vertical direction. When the push plate 51 moves from the periphery of the bearing platform 3 towards the center of the bearing platform 3, the vertical translation component 53 controls the push plate 51 to move from inside the bearing platform 3 to above the bearing platform 3.
[0024] Initially, multiple sets of push plates 51 are located around the bearing table 3 and inside the bearing table 3. Place the bearing ring to be flattened on the surface of the bearing table 3. The electric telescopic rod 41 pushes the cross plate 42 and the stamping block 43 downward. The stamping block 43 can perform stamping on the bearing ring on the surface of the bearing table 3. After a single stamping, the electric telescopic rod 41 controls the cross plate 42 and the stamping block 43 to move vertically upward. When the cross plate 42 moves upward, the sliding part 521 can control multiple sets of push plates 51 to move towards the center of the bearing table 3 along the radial direction of the bearing table 3. While the push plates 51 move along the radial direction of the bearing table 3, the vertical translation assembly 53 controls the push plates 51 to move to the outside of the bearing table 3. When the multiple sets of push plates 51 move, they can adjust the position of the bearing ring on the surface of the bearing table 3, and can stably place the bearing ring at the center position of the bearing table 3, facilitating continued stamping next time. After the bearing ring moves to the center position, after the cross plate 42 moves upward to the limit position, the adjusting part 522 and the sliding part 521 cooperate with each other to control the push plates 51 to move in the opposite direction towards the periphery of the bearing table 3. When the push plates 51 move to the inside of the bearing table 3, the push plates 51 will not interfere with the downward movement of the cross plate 42 and the stamping block 43, facilitating continued stamping next time.
[0025] As Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown in, as a preferred embodiment of the present invention, the sliding part 521 includes multiple sets of annularly distributed sliding grooves 5211 opened inside the bearing table 3. A connection groove 5212 communicating with the sliding grooves 5211 is opened downward on the surface of the bearing table 3. A sliding block 5213 is slidably installed in the sliding grooves 5211. The push plate 51 is arranged on the surface of the sliding block 5213. One end of the sliding groove 5211 close to the center of the bearing table 3 is fixedly installed with a compression spring 5214. The telescopic end of the compression spring 5214 is connected to the sliding block 5213. A wire groove 5215 extending to the outside of the bearing table 3 is opened inward at one end of the sliding groove 5211 close to the bearing table 3. A vertical rod 5216 is fixedly installed between the top wall of the fixed frame 2 and the workbench 1. A control rope 5219 is fixedly installed on the side wall of the sliding block 5213. One end of the control rope 5219 away from the sliding block 5213 passes through the wire groove 5215 and extends to the outside of the bearing table 3 and is fixedly installed with a control block 5217. The control block 5217 is made of a magnetic material. The control block 5217 is slidably connected to the vertical rod 5216 in the vertical direction. A magnetic block 5218 cooperating with the control block 5217 is fixedly installed on the bottom wall of the cross plate 42.
[0026] Initially, the compression spring 5214 exerts a thrust on the sliding block 5213. At this time, the sliding block 5213 is at one end of the slideway 5211 away from the center of the bearing platform 3. When the cross plate 42 and the stamping block 43 move downward to stamp the bearing ring, the magnetic block 5218 on the bottom wall of the cross plate 42 is connected to the control block 5217 as a whole through magnetic attraction. After a single stamping is completed, the electric telescopic rod 41 controls the cross plate 42 and the stamping block 43 to move upward. The cross plate 42 and the magnetic block 5218 cooperate with each other to drive the control block 5217 to move upward synchronously in the vertical direction. The control block 5217 and the control rope 5219 cooperate with each other to pull the sliding block 5213 to move synchronously in the slideway 5211 towards the center of the bearing platform 3. The sliding block 5213 drives the push plate 51 to move synchronously. After the control block 5217 moves upward to the limit position, the cross plate 42 continues to move upward, and the adjusting part 522 releases the suction force of the magnetic block 5218 on the control block 5217. The control block 5217 moves downward to the bottom end of the vertical rod 5216, and the compression spring 5214 exerts a thrust on the sliding block 5213. At this time, the sliding block 5213 moves to one end of the slideway 5211 away from the center of the bearing platform 3.
[0027] As Figure 2 , Figure 4 , Figure 5 shown, as a preferred embodiment of the present invention, the adjusting part 522 includes a telescopic cavity 5221 opened inside the bearing platform 3 and communicated with the wire groove 5215. The control rope 5219 passes through the telescopic cavity 5221. The control rope 5219 is divided into two sections inside the telescopic cavity 5221. One end of the control rope 5219 located inside the telescopic cavity 5221 is fixedly installed with a first telescopic block 5222, and the other end of the control rope 5219 located inside the telescopic cavity 5221 is fixedly installed with a second telescopic block 5223. A buffer spring 5224 is connected between the first telescopic block 5222 and the second telescopic block 5223.
[0028] When the control block 5217 moves upward and cooperates with the control rope 5219, it can pull the sliding block 5213 to move synchronously in the slideway 5211. After multiple groups of push plates 51 push the bearing ring to move to the center position of the bearing platform 3, the cross plate 42 continues to move upward. The cross plate 42 and the magnetic block 5218 cooperate with each other to further pull the control block 5217 to move synchronously. The control block 5217 pulls the control rope 5219 to move synchronously. The control rope 5219 pulls the second telescopic block 5223 to move synchronously in the telescopic cavity 5221. The second telescopic block 5223 and the first telescopic block 5222 cooperate with each other to conveniently adjust the position of the control rope 5219. When the first telescopic block 5222 moves to the end of the telescopic cavity 5221, at this time, the control block 5217 moves upward to the limit position, and the cross plate 42 drives the magnetic block 5218 to continue to move upward, and the magnetic block 5218 is separated from the control block 5217.
[0029] AsFigure 2 , Figure 3 , Figure 4 , Figure 5 As shown in Figure 2 , Figure 3 , Figure 4 , and Figure 5 , as a preferred embodiment of the present invention, the vertical translation assembly 53 includes a vertical groove 531 formed downward on the surface of the sliding block 5213. The push plate 51 is slidably installed in the vertical groove 531 in the vertical direction. Lateral grooves 532 communicating with the vertical groove 531 are respectively formed on the opposite side walls of the sliding block 5213. A guiding groove 534 is formed on the side wall of the slideway 5211. A guiding post 533 is fixedly installed on the side wall of the push plate 51. The guiding post 533 passes through the lateral groove 532 and is inserted into the guiding groove 534. The guiding groove 534 is of a broken-line structure and includes a bottom groove 5341, a connecting groove 5342, and a top groove 5343. The two ends of the connecting groove 5342 are respectively communicated with the bottom groove 5341 and the top groove 5343.
[0030] Initially, the sliding block 5213 is at one end of the slideway 5211 away from the center of the bearing platform 3. At this time, the guiding post 533 is inserted into the bottom groove 5341. When the sliding block 5213 moves in the slideway 5211 towards the center of the bearing platform 3, the sliding block 5213 drives the guiding post 533 to move synchronously. The guiding post 533 passes through the bottom groove 5341 and the connecting groove 5342 and moves into the top groove 5343. The guiding post 533 drives the push plate 51 to move upward synchronously in the vertical groove 531. At this time, the push plate 51 moves to the outside of the bearing platform 3, and the position of the bearing race can be adjusted conveniently.
[0031] As shown in Figure 2 , Figure 4 , Figure 5 As a preferred embodiment of the present invention, a roller 6 cooperating with the control rope 5219 is rotatably installed in the wire groove 5215. The roller 6 can effectively reduce the wear between the control rope 5219 and the wire groove 5215.
[0032] As shown in Figure 1 , Figure 2 As a preferred embodiment of the present invention, a shock-absorbing spring 7 surrounding the vertical rod 5216 and cooperating with the control block 5217 is fixedly installed on the surface of the workbench 1. When the control block 5217 moves downward, the shock-absorbing spring 7 can effectively reduce the impact force received by the control block 5217.
[0033] As shown in Figure 1 , Figure 2 As a preferred embodiment of the present invention, the cross plate 42 is slidably connected to the vertical rod 5216 in the vertical direction.
[0034] The working principle of the present invention is as follows: Initially, the extrusion spring 5214 applies a thrust to the sliding block 5213. At this time, the sliding block 5213 is located at one end of the slideway 5211 away from the center of the bearing platform 3. At this time, the guiding column 533 is inserted into the bottom groove 5341. Place the bearing ring to be flattened on the surface of the bearing platform 3. The electric telescopic rod 41 pushes the cross plate 42 and the stamping block 43 downward. The stamping block 43 can perform stamping on the bearing ring on the surface of the bearing platform 3. The magnetic block 5218 on the bottom wall of the cross plate 42 is integrated with the control block 5217 through magnetic attraction. After a single stamping, the electric telescopic rod 41 controls the cross plate 42 and the stamping block 43 to move upward. The cross plate 42 and the magnetic block 5218 cooperate with each other to drive the control block 5217 to move upward synchronously in the vertical direction. The control block 5217 and the control rope 5219 cooperate with each other to pull the sliding block 5213 to move synchronously in the slideway 5211 towards the center of the bearing platform 3. The sliding block 5213 drives the push plate 51 to move synchronously. When the sliding block 5213 moves towards the center of the bearing platform 3 in the slideway 5211, the sliding block 5213 drives the guiding column 533 to move synchronously. The guiding column 533 passes through the bottom groove 5341 and the communication groove 5342 and moves into the top groove 5343. The guiding column 533 drives the push plate 51 to move upward synchronously in the vertical groove 531. At this time, the push plate 51 moves to the outside of the bearing platform 3. When multiple groups of push plates 51 move, they can adjust the position of the bearing ring on the surface of the bearing platform 3, and can stably place the bearing ring at the center position of the bearing platform 3, facilitating continuous stamping next time.
[0035] After multiple groups of push plates 51 push the bearing ring to move to the center position of the bearing platform 3, the cross plate 42 continues to move upward. The cross plate 42 and the magnetic block 5218 cooperate with each other to pull the control block 5217 to move synchronously. The control block 5217 pulls the control rope 5219 to move synchronously. The control rope 5219 pulls the second telescopic block 5223 to move synchronously in the telescopic cavity 5221. The second telescopic block 5223 and the first telescopic block 5222 cooperate with each other to conveniently adjust the position of the control rope 5219. When the first telescopic block 5222 moves to the end of the telescopic cavity 5221, at this time, the control block 5217 moves upward to the limit position. The cross plate 42 drives the magnetic block 5218 to continue to move upward, and the magnetic block 5218 is separated from the control block 5217. The extrusion spring 5214 applies a thrust to the sliding block 5213. At this time, the sliding block 5213 moves to one end of the slideway 5211 away from the center of the bearing platform 3.
[0036] The above has described the preferred embodiments of the present invention in detail. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention.
Claims
1. An inner ring flattening device for forging a bearing ring, comprising a workbench, a fixing frame is fixedly installed on the surface of the workbench, the fixing frame is an inverted U-shaped structure, a bearing platform is fixedly installed on the surface of the workbench, and the bearing platform is a disc-shaped structure, characterized in that: The surface of the fixed frame is provided with a flattening component that cooperates with the bearing platform, and the flattening component includes an electric telescopic rod fixedly installed on the top wall of the fixed frame, and a cross plate is fixedly installed on the telescopic end of the electric telescopic rod, and a stamping block is fixedly installed on the bottom wall of the cross plate. A positioning mechanism is provided on the surface of the bearing platform, and the positioning mechanism includes a push plate, a lateral translation component and a vertical translation component. The push plates are provided in multiple groups and are distributed in a ring shape on the surface of the bearing platform. The lateral translation component includes a sliding part and an adjusting part, and the adjusting part is connected to the sliding part. When the cross plate moves upward in the vertical direction, the adjusting part controls the vertical movement of the cross plate by cooperating with the sliding part. The push plate moves synchronously along the radial direction of the bearing platform, and the sliding part includes multiple groups of slideways distributed in an annular manner opened inside the bearing platform, and a connecting groove connected to the slideway is opened downwardly on the surface of the bearing platform, and a sliding block is slidably installed in the slideway, and an extrusion spring is fixedly installed at one end of the slideway close to the center of the bearing platform, and the telescopic end of the extrusion spring is connected to the sliding block, and a wire groove extending to the outside of the bearing platform is opened at one end of the slideway, and a vertical rod is fixedly installed between the top wall of the fixed frame and the workbench, and a control rope is fixedly installed on the side wall of the sliding block, and the end of the control rope away from the sliding block passes through the wire groove and extends to the outside of the bearing platform and is fixedly installed with a control block, and the control block The control block is made of magnetic material, and is slidably connected to the vertical rod in the vertical direction. A magnetic block that cooperates with the control block is fixedly installed on the bottom wall of the horizontal plate. The adjustment part includes a telescopic cavity opened inside the bearing platform and connected to the wire groove. The control rope passes through the telescopic cavity. The control rope is divided into two sections in the telescopic cavity. A first telescopic block is fixedly installed on one end of the control rope located in the telescopic cavity, and a second telescopic block is fixedly installed on the other end of the control rope located in the telescopic cavity. A buffer spring is connected between the first telescopic block and the second telescopic block. The vertical translation assembly is connected to the push plate. When the push plate moves along the radial direction of the bearing platform, the vertical translation assembly controls the push plate to move. Moving synchronously in the vertical direction, when the push plate moves from the periphery of the bearing platform toward the center of the bearing platform, the vertical translation assembly controls the push plate to move from the inside of the bearing platform to the top of the bearing platform, and the vertical translation assembly includes a vertical groove opened downwardly on the surface of the sliding block, and the push plate is slidably installed in the vertical groove along the vertical direction, and the two side walls opposite to each other of the sliding block are respectively provided with lateral grooves connected with the vertical grooves, and the side walls of the slide are provided with guide grooves, and the side walls of the push plate are fixedly installed with guide columns, and the guide columns pass through the lateral grooves and are inserted into the guide grooves, and the guide grooves are of a zigzag structure, and the guide grooves include a bottom groove, a connecting groove and a top groove, and the two ends of the connecting groove are respectively connected with the bottom groove and the top groove.
2. The inner ring flattening device for forging a bearing ring according to claim 1, characterized in that: A roller that cooperates with the control rope is rotatably installed in the wire groove.
3. The inner ring flattening device for forging a bearing ring according to claim 1, characterized in that: A shock absorbing spring which surrounds the vertical rod and cooperates with the control block is fixedly installed on the surface of the workbench.
4. The inner ring flattening device for forging a bearing ring according to claim 1, characterized in that: The horizontal plate is slidably connected to the vertical rod along the vertical direction.
Citation Information
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Novel hydraulic casting device
CN111468576A
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Inner ring flattening equipment for bearing ring forging
CN220073147U