Ring-shaped workpiece necking device

Abstract

The utility model discloses an annular workpiece necking device which is used for compressing the inner diameter of an annular workpiece with an opening and comprises an operation table, a machining table, a ring pressing assembly and a driving mechanism, and the machining table, the ring pressing assembly and the driving mechanism are arranged on the operation table. A convex point used for stopping the annular workpiece upwards to enable the two ends of the opening to be staggered up and down is arranged in the machining area, the pressing ring assembly comprises a first necking pressing ring and a second necking pressing ring, and the driving mechanism is connected with the second necking pressing ring. The driving mechanism is used for driving the second necking pressing ring to move close to the first necking pressing ring so as to compress the annular workpiece in the machining area. In the necking process, the annular workpiece is subjected to extrusion force jointly applied by the first necking pressing ring and the second necking pressing ring, it is guaranteed that the annular workpiece is evenly stressed, the possibility that stress concentration happens to partial areas of the annular workpiece is reduced, and then the possibility that the annular workpiece is irregularly deformed due to stress concentration is reduced.

Description

Technical Field

[0001] This application belongs to the field of ring component processing, specifically relating to a ring-shaped workpiece necking device. Background Technology

[0002] Ring-shaped workpieces are common components in daily life and mechanical production, and are widely used in many fields, including automotive parts, due to their wide applicability and versatility. For some ring-shaped components with openings, after initial production, the ring-shaped workpieces need to be compressed and narrowed to varying degrees to adjust their inner diameter and adapt to different working conditions. Because ring-shaped workpieces have a certain degree of resilience, during compression and narrowing, uneven force application and difficulty in fixing the ring-shaped workpiece often lead to irregular deformation or the ring-shaped workpiece flying up and down during the narrowing process, affecting the forming efficiency of the ring-shaped workpiece. Utility Model Content

[0003] This application provides a device for reducing the opening of annular workpieces, which solves the technical problems of difficulty in forming annular structural parts and easy dislocation caused by uneven force application and positioning difficulties when compressing and closing annular workpieces in traditional technology.

[0004] The technical solution adopted in this application is as follows:

[0005] A device for reducing the diameter of an annular workpiece is disclosed, used to compress the inner diameter of an annular workpiece with an opening. The device includes an operating table and a processing table, a pressure ring assembly, and a driving mechanism respectively disposed on the operating table. The processing table has a processing area for placing the annular workpiece. The processing area has protrusions for stopping the annular workpiece upward and causing the two ends of the opening to be misaligned vertically. The pressure ring assembly includes a first reducing pressure ring and a second reducing pressure ring, which are distributed on both sides of the processing area. The first reducing pressure ring is fixedly connected to the processing table. The driving mechanism is connected to the second reducing pressure ring and is used to drive the second reducing pressure ring to move closer to the first reducing pressure ring to compress the annular workpiece in the processing area.

[0006] The annular workpiece necking device described in this application also includes the following additional technical features:

[0007] The first constricted pressure ring is provided with a first compression recess area, and the second constricted pressure ring is provided with a second compression recess area. The inner walls of the first compression recess area and the second compression recess area are used to compress the annular workpiece, and the inner walls of the first compression recess area and the second compression recess area are provided with anti-slip teeth.

[0008] The driving mechanism includes a drive motor and a lead screw and a nut that are driven to the output shaft of the drive motor. The nut is provided with a transmission component, which is connected to the second constricted pressure ring so that the second constricted pressure ring can be driven to move closer to or away from the first constricted pressure ring by the forward and reverse rotation of the output shaft of the drive motor.

[0009] The narrowing device also includes a guide frame, in which a guide cavity is provided. The nut is confined within the guide cavity, which is used to guide the nut to move along the lead screw.

[0010] The necking device also includes a pressing block located directly above the processing area and capable of being raised and lowered, the pressing block being used to press the annular workpiece downwards into the processing area.

[0011] The operating platform is equipped with a support, on which a counterweight cylinder and multiple pulleys are mounted. The piston rod of the counterweight cylinder is connected to the pressing block via pulley ropes wound around the multiple pulleys, so that the counterweight cylinder drives the pressing block to move up and down through the extension and retraction of the piston rod.

[0012] The necking device also includes a buffer cylinder, which is located in the processing area and is used to buffer the stroke of the clamping block pressing down on the annular workpiece.

[0013] The processing table includes a top plate and side plates supporting the top plate. The processing area is located on the top plate, and the top plate and the side plates form an accommodating space. The buffer cylinder is located in the accommodating space and connected to the top plate. The processing area is provided with a clearance hole for avoiding the buffer cylinder.

[0014] The operating platform is equipped with a protective frame, and the processing table, the pressure ring assembly and the drive mechanism are all located inside the protective frame. The protective frame is equipped with an operating window.

[0015] Safety light curtains are installed on both sides of the operation window.

[0016] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0017] 1. The ring-forming and shrinking device of this application includes an operating table with a processing table for supporting annular workpieces. During the shrinking process, the annular workpiece is first placed on the processing area of ​​the processing table, and one end of the opening in the ring-forming structure is placed on the protrusion. A driving mechanism drives a second shrinking ring to move towards the first shrinking ring to compress the annular workpiece. Under this compression, the annular workpiece gradually shrinks inward, thus reducing its inner diameter. Throughout the shrinking process, the shrinking of the annular workpiece is controlled by driving the second shrinking ring; that is, the degree of shrinking of the annular workpiece is directly proportional to the movement amplitude of the second shrinking ring. Therefore, the operator only needs to control the movement amplitude of the second shrinking ring to control the degree of shrinking of the annular workpiece. Precise control helps improve the consistency of necking of each annular workpiece under continuous operation conditions. In addition, since the annular workpiece is subjected to the extrusion force jointly applied by the first and second necking pressure rings during the necking process, the stress on the annular workpiece is ensured to be uniform, reducing the possibility of stress concentration in some areas of the annular workpiece caused by uneven stress, and thus reducing the possibility of irregular deformation of the annular workpiece due to stress concentration. Furthermore, the setting of the protrusions provides a staggered platform at both ends of the opening of the annular workpiece, and on this basis, it provides a guiding role for the subsequent inward necking of the annular workpiece, so that the part of the annular workpiece above the protrusions can achieve necking along a preset trajectory, which helps to improve the forming stability of the annular workpiece.

[0018] 2. In a preferred embodiment of this application, the provision of the first extrusion recess area and the second extrusion recess area makes the shapes of the first and second narrowing pressure rings more compatible with the shape of the annular workpiece. This helps to increase the uniformity of the extrusion force applied to the annular workpiece by the first and second narrowing pressure rings, allowing the annular workpiece to gradually narrow inward under a more uniform extrusion force, further reducing the probability of irregular deformation of the annular workpiece due to uneven force. On this basis, the anti-slip teeth can increase the friction between the first and second narrowing pressure rings and the annular workpiece, thereby improving the clamping stability of the first and second narrowing pressure rings on the annular workpiece and reducing the probability of the annular workpiece shifting circumferentially under the extrusion force.

[0019] 3. As a preferred embodiment of this application, by setting a drive motor and a lead screw and nut that are connected to the output shaft of the drive motor, the second shrinking pressure ring moves stably under the transmission of the lead screw and nut, which helps to improve the travel stability of the second shrinking pressure ring and ensures the directional accuracy of the travel path of the second shrinking pressure ring. The second shrinking pressure ring can only move along the transmission direction of the lead screw and nut, which improves the extrusion stability of the annular workpiece in multiple directions. In addition, the second shrinking pressure ring can move closer to or further away from the first shrinking pressure ring under the drive of the drive motor. After the shrinking work of a single annular workpiece is completed, the second shrinking pressure ring is driven away from the first shrinking pressure ring by the drive motor until it is reset to the initial position, which facilitates the placement of subsequent annular workpieces into the processing area and eliminates the need for the operator to reset the first shrinking pressure ring, which helps to improve the work efficiency during continuous operation.

[0020] 4. As a preferred embodiment of this application, since the annular workpiece is continuously compressed during the narrowing process, its internal elastic potential energy continues to accumulate, thus posing a risk of displacement along the vertical direction. By setting a clamping block, the movement of the annular workpiece in the vertical direction can be restricted, preventing the annular workpiece from vertically displacing during the narrowing process and improving the stability of the narrowing operation.

[0021] 5. In a preferred embodiment of this application, the operating table is provided with a support and a counterweight cylinder mounted on the support. The lifting and lowering movement of the clamping block is controlled by controlling the extension and retraction of the piston rod of the counterweight cylinder. This facilitates the adjustment of the position of the counterweight cylinder for annular workpieces of different thicknesses. For larger annular workpieces, the clamping block needs to be moved upward to prevent the weight of the clamping block from being fully applied to the annular workpiece, which could cause the annular workpiece to deform under pressure. For some smaller annular workpieces, the clamping block needs to be moved downward so that the annular workpiece abuts against the clamping block. In addition, after the necking work is completed, the clamping block can be moved upward by controlling the counterweight cylinder to facilitate the removal of the necked annular workpiece and the placement of subsequent annular workpieces that need to be necked in the rib processing area.

[0022] 6. As a preferred embodiment of this application, by setting a buffer cylinder, the descent process of the clamping block can be buffered. During the descent, the clamping block will first contact the buffer cylinder. Under the action of the buffer cylinder, the descent speed of the clamping block is reduced rapidly, and it contacts the annular workpiece at a relatively gentle speed, preventing the clamping block from falling too quickly and causing the annular workpiece to collide and be damaged. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0024] Figure 1 This is a schematic diagram of the annular workpiece necking device according to one embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the structure of a portion of the annular workpiece necking device according to one embodiment of this application. Figure 1 ;

[0026] Figure 3 for Figure 2 Enlarged view of part A;

[0027] Figure 4 This is a front view of a portion of the structure of the annular workpiece necking device according to one embodiment of this application;

[0028] Figure 5 for Figure 4 Enlarged view of part B;

[0029] Figure 6 This is a schematic diagram of the structure of a portion of the annular workpiece necking device according to one embodiment of this application. Figure 2 ;

[0030] Figure 7 for Figure 6 Enlarged view of part C;

[0031] Figure 8 This is a schematic diagram of the structure of a portion of the annular workpiece necking device according to one embodiment of this application. Figure 3 .

[0032] List of reference numerals in the attached diagram:

[0033] 1 control panel, 11 protective frames, 111 operation windows;

[0034] 2. Machining table; 21. Protrusion; 22. Top plate; 23. Side plate;

[0035] 3 First constriction pressure ring, 31 First extrusion recess area;

[0036] 4. Second constriction ring; 41. Second extrusion recess area;

[0037] 5 anti-slip teeth;

[0038] 6 drive motors;

[0039] 7. Lead screw;

[0040] 8 nuts;

[0041] 9. Guide frame, 91. Guide cavity;

[0042] 10 clamping blocks;

[0043] 110 bracket;

[0044] 120 counterweight cylinder;

[0045] 130 pulley, 1301 pulley rope;

[0046] 140 buffer cylinder;

[0047] 150mm clearance hole;

[0048] 160 ring-shaped workpiece, 1601 first end point, 1602 second end point;

[0049] 170 safety light curtain. Detailed Implementation

[0050] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0051] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0052] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", 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 this application 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 this application.

[0053] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0054] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0055] like Figures 1 to 8 As shown, a device for reducing the diameter of an annular workpiece 160 is used to compress the inner diameter of an annular workpiece 160 with an opening. The device includes an operating table 1 and a processing table 2, a pressure ring assembly, and a driving mechanism respectively disposed on the operating table 1. The processing table 2 is provided with a processing area for placing the annular workpiece 160. The processing area is provided with protrusions 21 for stopping the annular workpiece 160 upward and causing the two ends of the opening to be misaligned vertically. The pressure ring assembly includes a first reducing pressure ring 3 and a second reducing pressure ring 4. The first reducing pressure ring 3 and the second reducing pressure ring 4 are distributed on both sides of the processing area. The first reducing pressure ring 3 is fixedly connected to the processing table 2. The driving mechanism is connected to the second reducing pressure ring 4. The driving mechanism is used to drive the second reducing pressure ring 4 to move closer to the first reducing pressure ring 3 to compress the annular workpiece 160 in the processing area.

[0056] The ring-forming and shrinking device of this application includes an operating table 1 with a processing table 2 for supporting an annular workpiece 160. During the shrinking process, the annular workpiece 160 is first placed on the processing area of ​​the processing table 2, and one end of the opening in the ring-forming structure is placed on the protrusion 21. A driving mechanism drives the second shrinking ring 4 to move towards the first shrinking ring 3 to compress the annular workpiece 160. Under the compression, the annular workpiece 160 gradually shrinks inward, thus reducing its inner diameter. Throughout the shrinking process, the shrinking of the annular workpiece 160 is controlled by driving the second shrinking ring 4; that is, the degree of shrinking of the annular workpiece 160 is directly proportional to the movement amplitude of the second shrinking ring 4. Therefore, the operator only needs to control the movement amplitude of the second shrinking ring 4 to control the degree of shrinking of the annular workpiece 160. Precise control helps improve the consistency of the necking of each annular workpiece 160 under continuous operation conditions. In addition, since the annular workpiece 160 is subjected to the extrusion force jointly applied by the first necking pressure ring 3 and the second necking pressure ring 4 during the necking process, the force on the annular workpiece 160 is uniform, reducing the possibility of stress concentration in some areas of the annular workpiece 160 due to uneven force, thereby reducing the possibility of irregular deformation of the annular workpiece 160 due to stress concentration. Furthermore, the setting of the protrusion 21 provides a staggered platform at both ends of the opening of the annular workpiece 160, and on this basis, it provides a guiding role for the subsequent inward necking of the annular workpiece 160, so that the part of the annular workpiece 160 above the protrusion 21 necks along a preset trajectory, which helps to improve the forming stability of the annular workpiece 160.

[0057] For ease of explanation, such as Figure 5 As shown, the portion of the annular structural member 6 located above the protrusion 21 before the narrowing operation is called the first end point 1601, and the end point abutting against the side of the protrusion 21 is called the second end point 1602. Figure 5 In the middle, the annular structure 6 is in a preparatory state before the narrowing work, with the first end point 1601 and the second end point 1602 being flush in the vertical direction; when the narrowing work is carried out, the second end point 1602 remains stationary under the abutment of the protrusion 21, and the first end point 1601 gradually slides inward along the upper surface of the annular structure 6, which is the narrowing of the annular structure 6.

[0058] As a preferred embodiment of this application, such as Figure 2 , Figure 3 As shown, the first constricted pressure ring 3 is provided with a first compression recess 31, and the second constricted pressure ring 4 is provided with a second compression recess 41. The inner walls of the first compression recess 31 and the second compression recess 41 are used to compress the annular workpiece 160. The inner walls of the first compression recess 31 and the second compression recess 41 are provided with anti-slip teeth 5.

[0059] The first compression recess 31 and the second compression recess 41 make the shapes of the first narrowing pressure ring 3 and the second narrowing pressure ring 4 more compatible with the shape of the annular workpiece 160. This helps to increase the uniformity of the extrusion force applied to the annular workpiece 160 by the first narrowing pressure ring 3 and the second narrowing pressure ring 4, so that the annular workpiece 160 gradually narrows inward under the action of a more uniform extrusion force, further reducing the probability of irregular deformation of the annular workpiece 160 due to uneven force. On this basis, the anti-slip teeth 5 can increase the friction between the first narrowing pressure ring 3, the second narrowing pressure ring 4 and the annular workpiece 160, thereby improving the clamping stability of the first narrowing pressure ring 3 and the second narrowing pressure ring 4 on the annular workpiece 160 and reducing the probability of the annular workpiece 160 shifting circumferentially under the action of extrusion force.

[0060] Preferably, a portion of the first extrusion recess 31 and the second extrusion recess 41 are provided with spaced grooves to form anti-slip teeth 5. The outer surface of the anti-slip teeth 5 facing the processing area is flush with the inner surface of the first extrusion recess 31 and the second extrusion recess 41.

[0061] As a preferred embodiment of this application, such as Figure 6 , Figure 7 As shown, the drive mechanism includes a drive motor 6 and a lead screw 7 and a nut 8 that are connected to the output shaft of the drive motor 6. The nut 8 is provided with a transmission component, which is connected to the second constricted pressure ring 4 so that the second constricted pressure ring 4 can be driven to move closer to or away from the first constricted pressure ring 3 by the forward and reverse rotation of the output shaft of the drive motor 6.

[0062] By setting up a drive motor 6 and a lead screw 7 and a nut 8 that are connected to the output shaft of the drive motor 6, the second constricting pressure ring 4 moves stably under the transmission of the lead screw 7 and the nut 8, which helps to improve the travel stability of the second constricting pressure ring 4 and ensures the directional accuracy of the travel path of the second constricting pressure ring 4. The second constricting pressure ring 4 can only move along the transmission direction of the lead screw 7 and the nut 8, which improves the compression stability of the annular workpiece 160 in multiple directions. In addition, the second constricting pressure ring 4 can move closer to or further away from the first constricting pressure ring 3 under the drive of the drive motor 6. After the constriction work of a single annular workpiece 160 is completed, the drive motor 6 drives the second constricting pressure ring 4 away from the first constricting pressure ring 3 until it is reset to the initial position, which facilitates the placement of subsequent annular workpieces 160 into the processing area. This eliminates the need for the operator to reset the first constricting pressure ring 3 and helps to improve the work efficiency during continuous operation.

[0063] Preferably, such as Figure 7As shown, the necking device also includes a guide frame 9, within which a guide cavity 91 is provided. The nut 8 is confined within the guide cavity 91, which guides the nut 8 to move along the lead screw 7. The guide cavity 91 serves to guide and limit the movement of the nut 8. Furthermore, the guide frame 9 also provides some protection for the lead screw 7 and the nut 8, preventing external debris from affecting their normal operation and thus contributing to improved stability of the drive mechanism.

[0064] As a preferred embodiment of this application, such as Figure 8 As shown, the necking device also includes a lifting and lowering clamping block 10 located directly above the processing area. The clamping block 10 is used to press the annular workpiece 160 downwards into the processing area. Because the annular workpiece 160 is continuously compressed during the necking process, its internal elastic potential energy continuously accumulates, thus posing a risk of vertical displacement. By setting the clamping block 10, the vertical movement of the annular workpiece 160 can be restricted, preventing vertical displacement of the annular workpiece 160 during the necking process and improving the stability of the necking operation.

[0065] As a preferred embodiment of this implementation, such as Figure 8 As shown, the operating table 1 is provided with a bracket 110, and the bracket 110 is provided with a counterweight cylinder 120 and multiple pulleys 130. The piston rod of the counterweight cylinder 120 is connected to the pressing block 10 through the pulley rope 1301 wound around the multiple pulleys 130, so that the counterweight cylinder 120 drives the pressing block 10 to move up and down through the extension and retraction of the piston rod.

[0066] The operating table 1 is equipped with a support 110 and a counterweight cylinder 120 mounted on the support 110. The lifting and lowering movement of the clamping block 10 is controlled by controlling the extension and retraction of the piston rod of the counterweight cylinder 120. This allows for adjustment of the position of the counterweight cylinder 120 for annular workpieces 160 of different thicknesses. For larger annular workpieces 160, the clamping block 10 needs to be moved upward to prevent the weight of the clamping block 10 from being fully applied to the annular workpiece 160 and causing it to deform under pressure. For smaller annular workpieces 160, the clamping block 10 needs to be moved downward so that the annular workpiece 160 abuts against the clamping block 10. In addition, after the necking work is completed, the clamping block 10 can be moved upward by controlling the counterweight cylinder 120 to remove the necked annular workpiece 160 and place the annular workpieces 160 that need to be necked later into the rib processing area.

[0067] As another preferred embodiment of this implementation, such as Figure 4As shown, the necking device also includes a buffer cylinder 140, which is located in the processing area and is used to buffer the downward stroke of the clamping block 10 pressing the annular workpiece 160. By setting the buffer cylinder 140, the descent process of the clamping block 10 can be buffered. During the descent, the clamping block 10 will first contact the buffer cylinder 140. Under the action of the buffer cylinder 140, the descent speed of the clamping block 10 is rapidly reduced, and it contacts the annular workpiece 160 at a relatively gentle speed, preventing the clamping block 10 from falling too quickly and causing the annular workpiece 160 to collide and be damaged.

[0068] Preferably, the top of the buffer cylinder 140 is provided with a flexible anti-collision pad to reduce the relative collision when the clamping block 10 comes into contact with the buffer cylinder 140.

[0069] Preferably, such as Figure 3 , Figure 4 As shown, the processing table 2 includes a top plate 22 and side plates 23 supporting the top plate 22. The processing area is located on the top plate 22, and the top plate 22 and side plates 23 form a receiving space. The buffer cylinder 140 is located in the receiving space and connected to the top plate 22. The processing area is provided with a clearance hole 150 for avoiding the buffer cylinder 140. The setting of the receiving space provides an installation position for the buffer cylinder 140, separating the buffer cylinder 140 from other components and avoiding mutual interference between the components.

[0070] As a preferred embodiment of this application, such as Figure 1 As shown, the operating table 1 is equipped with a protective frame 11, and the processing table 2, the pressure ring assembly and the drive mechanism are all located inside the protective frame 11. The protective frame 11 is equipped with an operating window 111.

[0071] By setting up the protective frame 11, the components on the operating table 1 can be protected to a certain extent, reducing the probability of external debris interfering with the pressure ring assembly and drive mechanism; and the protective frame 11 is provided with an operating window 111, which makes it easy for the operator to observe the inside of the protective frame 11 through the operating window 111, realize the real-time observation of the shrinkage state of the annular workpiece 160, and help optimize the shrinkage work.

[0072] Preferably, such as Figure 1 As shown, safety light curtains 170 are installed on both sides of the operation window 111. The safety light curtains 170 can detect the approach of personnel or objects. When personnel or objects are working within the normal operating range, the safety light curtains 170 will not issue a warning and will not interfere with the normal operation of the operator; however, when personnel or objects enter the necking processing area, the safety light curtains 170 will detect and issue a warning in real time, thereby stopping the equipment operation and preventing accidents from occurring.

[0073] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0074] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0075] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A device for reducing the diameter of an annular workpiece, used to compress the inner diameter of an annular workpiece with an opening, characterized in that, The necking device includes an operating table and a processing table, a pressure ring assembly, and a driving mechanism respectively disposed on the operating table. The processing table has a processing area for placing an annular workpiece. The processing area has protrusions for stopping the annular workpiece upwards, thereby causing the two ends of the opening to be misaligned vertically. The pressure ring assembly includes a first necking pressure ring and a second necking pressure ring, which are distributed on both sides of the processing area. The first necking pressure ring is fixedly connected to the processing table. The driving mechanism is connected to the second necking pressure ring and is used to drive the second necking pressure ring to move closer to the first necking pressure ring to compress the annular workpiece in the processing area.

2. The annular workpiece necking device according to claim 1, characterized in that, The first constricted pressure ring is provided with a first compression recess area, and the second constricted pressure ring is provided with a second compression recess area. The inner walls of the first compression recess area and the second compression recess area are used to compress the annular workpiece, and the inner walls of the first compression recess area and the second compression recess area are provided with anti-slip teeth.

3. The annular workpiece necking device according to claim 1, characterized in that, The driving mechanism includes a drive motor and a lead screw and a nut that are driven to the output shaft of the drive motor. The nut is provided with a transmission component, which is connected to the second constricted pressure ring so that the second constricted pressure ring can be driven to move closer to or away from the first constricted pressure ring by the forward and reverse rotation of the output shaft of the drive motor.

4. The annular workpiece necking device according to claim 3, characterized in that, The narrowing device also includes a guide frame, in which a guide cavity is provided. The nut is confined within the guide cavity, which is used to guide the nut to move along the lead screw.

5. The annular workpiece necking device according to claim 1, characterized in that, The necking device also includes a pressing block located directly above the processing area and capable of being raised and lowered, the pressing block being used to press the annular workpiece downwards into the processing area.

6. The annular workpiece necking device according to claim 5, characterized in that, The operating platform is equipped with a support, on which a counterweight cylinder and multiple pulleys are mounted. The piston rod of the counterweight cylinder is connected to the pressing block via pulley ropes wound around the multiple pulleys, so that the counterweight cylinder drives the pressing block to move up and down through the extension and retraction of the piston rod.

7. The annular workpiece necking device according to claim 5, characterized in that, The necking device also includes a buffer cylinder, which is located in the processing area and is used to buffer the stroke of the clamping block pressing down on the annular workpiece.

8. The annular workpiece necking device according to claim 7, characterized in that, The processing table includes a top plate and side plates supporting the top plate. The processing area is located on the top plate, and the top plate and the side plates form an accommodating space. The buffer cylinder is located in the accommodating space and connected to the top plate. The processing area is provided with a clearance hole for avoiding the buffer cylinder.

9. The annular workpiece necking device according to claim 1, characterized in that, The operating platform is equipped with a protective frame, and the processing table, the pressure ring assembly and the drive mechanism are all located inside the protective frame. The protective frame is equipped with an operating window.

10. The annular workpiece necking device according to claim 9, characterized in that, Safety light curtains are installed on both sides of the operation window.

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