A cutting device for processing of a hanger embedded double slip

Abstract

This invention relates to a cutting device for machining a double-slip assembly embedded in a suspension device, belonging to the technical field of slip cutting devices. The invention includes a positioning structure comprising a mandrel and multiple support rods mounted on the mandrel. These support rods can be divided into multiple groups of support rods evenly arranged around the central axis of the mandrel. Each support rod group supports the inner sidewall of the area in the slip blank used to form the slip. Each support rod group includes two rows of support rods symmetrically arranged about the plane containing the central axis of the mandrel. Each row of support rods includes multiple support rods with the same extension direction, spaced apart along the central axis of the mandrel. The support rods in the two rows within the same support rod group are staggered along the central axis of the mandrel, and the central axes of all support rods are skewed from the central axis of the mandrel. This invention can apply tangential support force to the slip blank, improving support stability.

Description

Technical Field

[0001] This invention relates to the field of slip cutting device technology, and more particularly to a cutting device for machining double slips embedded in a suspension. Background Technology

[0002] In modern oil and gas drilling and production engineering, the tailpipe hanger is a key piece of equipment for achieving efficient and safe well completion in complex, deep, and small-aperture wells. The performance of its core anchoring component, the embedded double slips, directly determines the reliability and safety of the entire tubing suspension system. In recent years, with the development of drilling technology towards ultra-deep, ultra-high temperature and high pressure, and unconventional resource extraction, unprecedented challenges have been posed to the load-bearing capacity, sealing performance, and operational reliability of the tailpipe hanger. Against this backdrop, the embedded double slip structure has emerged and, due to its significant technological advantages, is gradually replacing traditional slips.

[0003] The embedded double slip is a double-conical, multi-piece anchoring mechanism integrated into the internal cavity of the suspension body. Its core design concept is to pre-place two independent slip components in a specific cavity of the suspension body in an embedded manner. Through hydraulic or mechanical stimulation, they expand synchronously along the radial direction of the conical surface, engaging the upper sleeve wall, thereby achieving reliable suspension and load transfer of the tailpipe string.

[0004] In the existing technology, when processing slips, a tubular blank is usually clamped on a cutting device and cut to produce multiple slips.

[0005] A clamping device for machining, as disclosed in patent application CN119657970A, includes a mandrel, an elastic support assembly disposed on the outer surface of the mandrel, and a first pressure plate and a second pressure plate sleeved on the outer surface of the mandrel. The first and second pressure plates are respectively provided with a first clamping groove and a second clamping groove. The two ends of the clamping pad are respectively engaged in the first and second clamping grooves. The end of the elastic support assembly away from the mandrel is in abutting contact with the surface of the clamping pad. This device can provide sufficient support force through the first and second pressure plates and the elastic support assembly, and the elastic support assembly can provide vibration damping performance for the clamping pad, thereby giving the clamping pad better stability during machining, preventing the clamping pad from falling off the loading mechanism, and improving workpiece accuracy and machining efficiency.

[0006] However, the elastic support component in this device generally extends radially along the mandrel. The elastic support can only support the blank in the radial direction of the blank, but lacks tangential restraint on the blank. During the processing, if the blank encounters a large tangential resistance, it is easy for the blank to rotate relative to the mandrel, affecting the processing accuracy. Summary of the Invention

[0007] This invention provides a cutting device for processing double slips embedded in a suspension unit, which solves the technical problem that existing cutting devices for processing slips cannot limit the slip blank in the tangential direction, causing the slip blank to easily rotate relative to the mandrel when subjected to large tangential resistance during processing, thus affecting the processing accuracy.

[0008] To solve the above problems, the present invention provides a cutting device for machining a double slip embedded in a suspension device, which adopts the following technical solution:

[0009] A cutting device for machining a double slip embedded in a suspension device includes a positioning structure. The positioning structure includes a mandrel and multiple support rods mounted on the mandrel. The multiple support rods can be divided into multiple groups of support rods evenly arranged around the central axis of the mandrel. Each group of support rods is supported on the inner sidewall of the area where the slip is formed in the slip blank. Each group of support rods includes two rows of support rods symmetrically arranged about the plane containing the central axis of the mandrel. Each row of support rods includes multiple support rods with the same extension direction arranged at intervals along the central axis of the mandrel. The support rods in the two rows of support rods in the same support rod group are arranged alternately along the central axis of the mandrel. The central axis of each support rod is skewed from the central axis of the mandrel, so that the support rods form a tangential supporting force on the slip blank.

[0010] By adopting the above technical solution, the central axis of the support rod and the central axis of the mandrel are kept out of plane, that is, the central axis of the support rod does not pass through the central axis of the mandrel. In this way, when the support rod supports the blank of the clamping plate, the supporting force of the support rod on the blank of the clamping plate will generate a component force along the tangential direction of the blank of the clamping plate. Since the rotation directions of the two adjacent sets of support rods are opposite, the blank of the clamping plate is subjected to two tangential forces in opposite directions. In this way, no matter which direction the blank of the clamping plate rotates relative to the mandrel, there is a corresponding tangential force to counteract it, thereby achieving effective limiting of the blank of the clamping plate in the tangential direction, avoiding the blank of the clamping plate from being subjected to a large tangential load during processing and rotating relative to the mandrel. Furthermore, the staggered arrangement of support points further improves the uniformity of support and overall rigidity, ensuring the processing accuracy and consistency of the final clamping plate shape.

[0011] Furthermore, the mandrel is tubular, and a push rod is coaxially inserted inside the mandrel. Multiple conical push blocks are fixedly mounted on the push rod, arranged at equal intervals along the length of the rod. The small diameter ends of each conical push block face the same direction. Multiple support rods whose rod axes are located in the same cross section of the mandrel are called a ring of support rods. Each ring of support rods corresponds to the position of each conical push block, and the inner end of each support rod is elastically pressed against the outer wall of the corresponding conical push block. The push rod can move along the length of the rod to push each support rod in the support rod group to extend or retract.

[0012] By adopting the above technical solution, a push rod and a conical push block are coaxially arranged, and the inner end of the support rod is elastically pressed against the side wall of the conical block, achieving synchronous and linked extension and retraction control of all support rods. When the push rod moves axially, the conical block synchronously pushes the corresponding support rods of each turn to extend radially outward to support the blank, or allows them to retract under elastic action for loading and unloading workpieces. This centralized drive method is not only easy to operate and responds quickly, but also ensures that the extension of each support rod is highly consistent, thereby applying a uniform and symmetrical support force to the tubular clamp blank. Compared with the existing technology where the support rods are threaded onto the mandrel and the extension length of the support rod is adjusted by rotating each support rod, this method can effectively reduce the error between the extension lengths of each support rod, avoid excessive local stress or weak support, further improve the stability and reliability of clamping, and make the structure more compact. At the same time, the operation is simpler, as only the push rod is driven to move along the axis to drive each support rod to extend or retract synchronously, resulting in higher assembly efficiency.

[0013] Furthermore, a mounting plate is fixedly installed inside the mandrel, and a push rod is spirally inserted through the mounting plate. By rotating the push rod, each conical push block can be driven to reciprocate along the axial direction of the mandrel.

[0014] By employing the above technical solution, the rotational motion of the push rod is converted into its own linear motion through a helical transmission, thereby driving the conical push block. This transmission method has good motion accuracy and self-locking performance, allowing the operator to fine-tune the extension of the support rod by precisely controlling the rotation angle. Once adjusted, the position automatically locks without external force, preventing the push rod from accidentally moving during processing vibrations and causing the support to loosen. This greatly enhances the anti-interference capability and long-term working stability of the entire positioning structure during processing.

[0015] Furthermore, the push rod is equipped with scale lines, which are located on the side where the mounting plate is located.

[0016] By employing the above technical solution, scale lines are set on the push rod, providing the operator with intuitive and quantifiable positional feedback. By observing the changes in the scale lines relative to the mounting plate, the operator can precisely control the movement distance of the push rod, thereby precisely controlling the radial extension of all support rods. This facilitates rapid and accurate adaptive adjustment of clamp blanks with different wall thicknesses or initial inner diameters, ensuring consistent support force and tightness in each clamping operation, reducing errors caused by experience-based operation, and improving the dimensional consistency of batch-processed workpieces.

[0017] Furthermore, the end of the push rod with graduated lines is connected to a screw handle.

[0018] By adopting the above technical solution and connecting a screw handle to the end of the push rod, the ergonomics of the device are significantly improved. The handle provides a larger lever arm and a more comfortable grip point, allowing the operator to rotate the push rod for adjustment with less effort and more smoothly. This not only reduces the intensity of operation but also makes precise control of the push rod easier, contributing to further improvements in adjustment accuracy and efficiency, and making the entire clamping process more convenient and reliable.

[0019] Furthermore, a vibration damping component is coaxially connected to the outer end of the support rod, and the vibration damping component is elastically pressed against the inner wall of the clamp blank.

[0020] By adopting the above technical solution, a vibration damping component is added to the outer end of the support rod, enabling it to elastically press against the inner wall of the blank. This design provides the necessary support force while introducing buffering and vibration absorption functions. During the cutting process, the vibration damping component can absorb and attenuate the vibration generated by the interaction between the tool and the workpiece, preventing the vibration from being directly transmitted to the entire mandrel system through the rigid support or causing high-frequency chatter in the workpiece. This effectively improves the smoothness of the cutting process, helps to obtain better machined surface quality, and further improves machining accuracy. At the same time, it can also prevent the blank from being loosened from the positioning structure due to long-term vibration.

[0021] Furthermore, the vibration damping assembly includes a vibration damping rod, the outer end of which is connected to a rubber head. The support rod is hollow inside, and the vibration damping rod and the support rod are slidably inserted coaxially inside the support rod. An elastic element capable of extending and retracting along the axis of the support rod is connected between the vibration damping rod and the support rod. The elastic element applies an elastic force to the vibration damping rod in the opposite direction to the support rod, so that the rubber head is pressed against the inner wall of the clamp blank.

[0022] Using the above technical solution, the damping rod slides within the support rod and is provided with elastic force by the elastic element, allowing the rubber head to always adaptively press against the potentially irregular inner wall of the blank. The rubber head provides sufficient friction to prevent slippage while avoiding scratches on the workpiece surface. The elastic element gives the support a certain degree of flexibility, dynamically compensating for gaps caused by changes in cutting force or slight deformation of the blank, maintaining stable contact, and thus enhancing the dynamic stability of the system.

[0023] Furthermore, two end limiting components are installed on the mandrel. The end limiting components are provided with annular grooves for the end of the clamp blank to be inserted into, and the openings of the two annular grooves on the two end limiting components are arranged opposite to each other.

[0024] The above technical solution uses two end-positioning components with opposing annular grooves to secure the blank from both axial ends. This provides reliable axial positioning and constraint for the blank, effectively preventing movement or offset along the mandrel axis during machining. The combination of axial positioning and radial and tangential support constitutes comprehensive constraint on the workpiece in six degrees of freedom in space, achieving more stable and precise positioning, which is beneficial for subsequent high-precision cutting.

[0025] Furthermore, the position of the end stop on the mandrel along the mandrel axis is adjustable.

[0026] By adopting the above technical solution, the axial position of the end limiting component on the mandrel is adjustable. This design greatly improves the versatility and flexibility of the device, enabling it to adapt to blanks of different lengths. By adjusting the distance between the two end limiting components, the length of the blank can be accurately matched, ensuring that the annular groove can firmly hold the end of the blank without causing the clamping to be too tight and unable to be installed, or too loose and lose its axial limiting function due to improper distance. This expands the applicability of the processing device.

[0027] Furthermore, the mandrel is provided with multiple threaded holes arranged at equal intervals along the axis of the mandrel, and a locking bolt is provided on the end limiting member. The locking bolt can be screwed into different threaded holes to adjust the position of the end limiting member in the axial direction of the mandrel.

[0028] By employing the above technical solution, the discrete, stepped adjustment of the position of the limiting component is achieved through the cooperation of equally spaced threaded holes on the mandrel and locking bolts. The equally spaced threaded holes ensure the standardization and consistency of the adjustment. During operation, simply loosen the bolts, slide the limiting component to the corresponding hole position, and then re-tighten. This mechanical locking method has a robust structure, good vibration resistance, and ensures that the limiting component will not shift during high-speed cutting. It also has low manufacturing costs and is easy to maintain.

[0029] The beneficial effects of the cutting device for processing double slips embedded in a suspension device provided by this invention are as follows: By setting the axis of the support rod to be out of plane with the axis of the mandrel, the supporting force of the support rod on the slip blank can generate a tangential component force, providing tangential support to the slip blank and preventing the slip blank from rotating relative to the mandrel during processing. By setting multiple conical push blocks, the bottom of each support rod is elastically pressed against the outer wall of the conical push block. When the conical push block is driven to move axially, it can drive multiple support rods to extend outward synchronously to provide more uniform support to the slip blank. Attached Figure Description

[0030] Figure 1 A front view of a cutting device for machining a double slip embedded in a suspension device provided by the present invention;

[0031] Figure 2 A three-dimensional structural diagram of a positioning structure supporting a blank in a cutting device for machining a double slip embedded in a suspension device, provided by the present invention.

[0032] Figure 3 A three-dimensional structural diagram of a cutting device for machining a double slip embedded in a suspension device, provided by the present invention, showing the positioning structure supporting the machined slip.

[0033] Figure 4 A three-dimensional structural diagram of the positioning structure in a cutting device for machining a double slip embedded in a suspension device provided by the present invention;

[0034] Figure 5 A front sectional view of the positioning structure in a cutting device for machining a double slip embedded in a suspension device provided by the present invention;

[0035] Figure 6 A side sectional view of the positioning structure in a cutting device for machining a double slip embedded in a suspension device, provided by the present invention;

[0036] Figure 7 for Figure 6 Enlarged structural diagram at point A;

[0037] Figure 8 This is a side view of the positioning structure in a cutting device for machining a double slip embedded in a suspension, as provided by the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Mandrel; 101. Threaded positioning hole; 2. Slip blank; 3. Slip; 4. End limiting component; 401. Connecting part; 402. Limiting part; 403. Limiting block; 404. Annular groove; 5. Locking bolt; 6. Push rod; 7. Tightening handle; 8. Vibration damping rod; 9. Support rod; 10. Conical push block; 11. Rubber head; 12. Mounting plate one; 13. Mounting plate two; 14. Push head; 15. Elastic component one; 16. Elastic component two; 17. Cutting machine tool; 18. Three-jaw chuck; 19. Scale line. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] The following is one embodiment of a cutting device for machining a suspension-embedded double slip provided by the present invention:

[0042] like Figures 1-8 As shown, a cutting device for machining a suspension-embedded double slip includes a cutting machine tool 17 and a positioning structure.

[0043] like Figure 1 As shown, the cutting machine tool 17 is arranged on the ground, and the cutting machine tool 17 is equipped with a three-jaw chuck 18, the clamping axis of the three-jaw chuck 18 extending to the left and right.

[0044] The positioning structure is mounted on the cutting machine tool 17, and the left end of the positioning structure is held by a three-jaw chuck 18.

[0045] The positioning structure includes a spindle 1, a support rod assembly, a push rod 6, a vibration damping component, and an end limiting component 4.

[0046] like Figure 2 , Figure 3 As shown, the mandrel 1 is a tubular structure extending left and right along the central axis. The mandrel 1 is provided with two rows of symmetrically arranged positioning holes, which include multiple threaded positioning holes 101 arranged at equal intervals on the left and right.

[0047] like Figure 5 As shown, the mandrel 1 is also provided with two circular mounting plates that are perpendicular to the central axis of the mandrel 1, namely mounting plate one 12 and mounting plate two 13. Mounting plate one 12 and mounting plate two 13 are located on the left and right sides of the two sets of positioning holes, respectively. Mounting plate two 13 is provided with threaded through holes extending left and right along the axis.

[0048] There are four sets of support rods, all of which are installed on the spindle 1 and are evenly arranged around the central axis of the spindle 1.

[0049] like Figure 4 As shown, each support rod group includes two rows of support rods, and each row of support rods includes multiple support rods 9 arranged at equal intervals along the left and right directions.

[0050] Two columns of support rods in the same support rod group are defined as the first support rod column and the second support rod column. The extension direction of each support rod 9 in the first support rod column is consistent, and the extension direction of each support rod 9 in the second support rod column is also consistent. The support rods 9 in the first support rod column and the support rods 9 in the second support rod column are arranged alternately in the left-right direction.

[0051] The axial extension direction of support rod 9 in the first support rod row forms an acute angle with the axial extension direction of support rod 9 in the second support rod row, such as... Figures 6-8As shown, the first and second support rod rows in the same support rod group support the inner wall of the area in the jaw blank 2 where the jaw 3 is machined. The angle between the axis of the support rod 9 in the first support rod row and the plane passing through the central axis of the mandrel 1 and bisecting the corresponding jaw 3 is equal to the angle between the axis of the support rod 9 in the second support rod row and the plane passing through the central axis of the mandrel 1 and bisecting the corresponding jaw 3. Thus, after the jaw 3 is machined from the jaw blank 2, the first and second support rod rows can support the jaw 3, preventing it from falling off.

[0052] like Figure 8 As shown, the central axes of each support rod 9 in the first and second support rod rows are skewed from the central axis of the mandrel 1, meaning that the central axis of the support rod 9 does not pass through the central axis of the mandrel 1. The line connecting the center of the mandrel 1 and the support point on the slip blank 2 forms an acute angle with the central axis of the support rod 9. The central axis of the support rod 9 deviates from the radial direction of the mandrel 1. Thus, the supporting force of the support rod 9 on the slip blank 2 does not pass through the center of the mandrel 1. This supporting force will generate a component force along the tangential direction of the slip blank 2, providing tangential support to the slip blank 2 and preventing the slip blank 2 from rotating relative to the mandrel 1.

[0053] like Figure 6 , Figure 7 As shown, each of the aforementioned support rods 9 is slidably mounted on the spindle 1 along its length. Each support rod 9 has a push head 14 connected to its bottom end, and the bottom end of the push head 14 is hemispherical. An elastic element 16 is fitted onto the outer side of each support rod 9. The elastic element 16 connects the push head 14 and the spindle 1, and applies an elastic force to the support rod 9 towards the inside of the spindle 1.

[0054] like Figure 5 As shown, the push rod 6 is coaxially inserted into the spindle 1, and the right section of the push rod 6 is spirally inserted into the threaded hole on the mounting plate 13. The left section of the push rod 6 is slidably inserted into the mounting plate 12. The left end of the push rod 6 is also fixedly connected to a screw handle 7. By rotating the screw handle 7, the push rod 6 can be rotated, thereby causing the push rod 6 to move in the left and right directions.

[0055] like Figure 5As shown, five conical push blocks 10 are fixedly mounted on the outer side of the push rod 6, arranged at equal intervals along the left and right directions. The small diameter end of each conical push block 10 is set to the right. Among the support rods 9 mentioned above, the four support rods 9 located at the same position in the axial direction of the spindle 1 are called a ring of support rods 9. The five rings of support rods 9 on the spindle 1 correspond to the positions of the five conical push blocks 10 respectively. The push head 14 at the bottom of each support rod 9 in each ring of support rods is elastically pressed against the outer wall of the corresponding conical push block 10 under the action of the elastic element 16.

[0056] When the aforementioned push rod 6 is rotated and moved to the right, it drives each conical push block 10 to move to the right synchronously, and the conical push block 10 pushes each support rod 9 to extend outward synchronously.

[0057] like Figure 6 , Figure 7 As shown, the vibration damping assembly includes a vibration damping rod 8 and a rubber head 11. The support rod 9 is hollow inside. The vibration damping rod 8 and the support rod 9 are slidably inserted into the support rod 9 in a coaxial manner. An elastic element 15 is connected between the vibration damping rod 8 and the support rod 9. The rubber head 11 is connected to the top of the vibration damping rod 8. When the support rod 9 extends outward, the rubber head 11 is pressed against the inner side wall of the clamp blank 2.

[0058] like Figure 3 , Figure 4 As shown, the mandrel 1 is also provided with two end limiting members 4 arranged symmetrically on the left and right. The end limiting members 4 are ring-shaped structures, and both end limiting members 4 are fitted on the outside of the mandrel 1. The end limiting member 4 includes a connecting part 401 and a limiting part 402. A locking bolt 5 is passed through the connecting part 401. The locking bolt 5 is screwed into the threaded positioning hole 101 on the mandrel 1 to fix the end limiting member 4 on the mandrel 1. By changing the threaded positioning hole 101 in which the locking bolt 5 is screwed, the position of the end limiting member 4 on the mandrel 1 can be changed, so that it can be used to position the blanks 2 of different lengths.

[0059] The outer end of the limiting part 402 is provided with four limiting blocks 403 evenly arranged around the central axis of the limiting part 402. The limiting blocks 403 are provided with U-shaped grooves with openings facing the other end limiting member 4. The U-shaped grooves on the four limiting blocks 403 are spliced ​​together to form an annular groove 404. The two annular grooves 404 in the two end limiting members 4 are used for the left and right ends of the clamp blank 2 to be clamped in, respectively. The vertical groove wall of the annular groove 404 blocks the left and right end faces of the clamp blank 2, thereby restricting the movement of the clamp blank 2 in the left and right direction on the mandrel 1. The inner wall of the outer ring of the annular groove 404 blocks the circumferential outer wall of the clamp blank 2, thereby restricting the movement of the clamp blank 2 in the radial direction.

[0060] The four limiting blocks 403 correspond one-to-one with the four sets of support rods on the mandrel 1 in the left-right direction. This ensures that after the blank 2 is processed into the blank 3, the inner side of the independent blank 3 is supported by the support rod 9 and the vibration damping component, while the outer side is blocked by the limiting blocks 403, thus clamping the independent blank 3. This allows the blank 2 to be directly processed into multiple independent blank 3 pieces during the processing, eliminating the need to process the blank 2 into multiple continuously spliced ​​blank 3 pieces for easy positioning and then cut the continuously spliced ​​blank 3 pieces separately later. The blank 3 can be formed in one process.

[0061] like Figure 2 As shown, a scale line 19 is provided on the outer side wall of the left end of the push rod 6. The left side of the mounting plate 12 can be used as a positioning plane. During the process of screwing the push rod 6, the distance that the support rod 9 is pushed out can be determined by observing which scale line 19 the positioning plane is aligned with, thereby determining the magnitude of the support force. That is, different scale lines 19 represent different support forces, making it easier to control the magnitude of the support force when assembling the clamp blank 2 onto the positioning structure.

[0062] In use, the blank 2 to be processed is first fitted onto the outside of the mandrel 1. Then, the two end limiting members 4 are symmetrically fitted onto the mandrel 1, so that both ends of the blank 2 are inserted into the annular grooves 404 on the two end limiting members 4 respectively. After adjusting the positions of the two end limiting members 4 and the blank 2 on the mandrel 1, the two end limiting members 4 will hold the blank 2 in place. The locking bolts 5 on the end limiting members 4 are then screwed into the corresponding threaded positioning holes 101, thus completing the axial positioning of the blank 2 on the mandrel 1.

[0063] Then, the operator holds the screw handle 7 and rotates the push rod 6, driving the push rod 6 to move to the right. The push rod 6 drives the conical push block 10 to move to the right. The outer wall of the conical push block 10 pushes each support rod 9 outward in sync. The support rod 9 drives the damping rod 8 to move outward. The rubber head 11 at the top of the damping rod 8 is braced against the inner wall of the clamp blank 2, thus clamping and fixing the clamp blank 2. Since the central axis of the support rod 9 does not pass through the center of the mandrel 1, the supporting force of the support rod 9 and the damping rod 8 on the clamp blank 2 has a component force extending tangentially along the clamp blank 2. This tangential component force can enhance the limiting effect of the clamp blank 2 in the circumferential direction, and prevent the clamp blank 2 from rotating relative to the mandrel 1 when subjected to a large tangential load during processing, thus affecting the cutting accuracy.

[0064] During the adjustment process, by observing the alignment of the positioning plane with the scale line 19 on the push rod 6, it is possible to determine the length of the distance that the support rod 9 is pushed out by the conical push block 10, thereby determining the magnitude of the supporting force on the blank 2, enabling the operator to adjust the supporting force more accurately.

[0065] The left end of the mandrel 1 is then fixedly clamped in the three-jaw chuck 18 on the cutting machine tool 17, and the positioning structure is fixed on the cutting machine tool 17. The cutting machine tool 17 is then started to cut the slip blank 2. During the cutting process, the two rows of support rods in each set of support rods support the area in the slip blank 2 used to form the slip 3, preventing the slip 3 from falling off after it is formed.

[0066] After the chuck 3 is processed, remove the positioning structure from the three-jaw chuck 18, then rotate the handle 7 in the opposite direction to move the push rod 6 to the left, the support rod 9 retracts, and the chuck 3 is no longer pressed by the support rod 9. Then, tighten the locking bolt 5 to remove the end limit piece 4, and the processed chuck 3 can be removed.

[0067] The present invention sets the support rod 9 in a structure in which the central axis is skewed from the central axis of the mandrel 1, so that the support rod 9 can generate tangential support force on the blank 2, thereby preventing the blank 2 from rotating relative to the mandrel 1 due to the large tangential load during processing, and making the support of the blank 2 more stable.

[0068] In this embodiment, a vibration damping component is provided at the outer end of the support rod 9, which supports the inner wall of the blank 2. In other embodiments, the vibration damping component is not provided at the outer end of the support rod 9, and a rubber head 11 is directly installed at the outer end of the support rod 9. The rubber head 11 is supported on the inner wall of the blank 2 by the support rod 9. At this time, the vibration damping effect of the support rod 9 is weakened.

[0069] In this embodiment, the push rod 6 is screwed onto the mounting plate 13. By rotating the push rod 6, it is driven to move axially, thereby driving the conical push block 10 to move axially and push out the support rod 9. In other embodiments, a cylinder can be arranged inside or beside the spindle 1. The piston rod of the cylinder is connected to the push rod 6. The extension and retraction of the piston rod drives the push rod 6 to move axially to adjust the extension amount of the support rod 9.

[0070] In this embodiment, the outer wall of the push rod 6 is provided with scale lines 19. The magnitude of the supporting force applied to the blank 2 can be determined by observing which line of scale lines 19 aligns with the outer side of the mounting plate 12. In other embodiments, the push rod 6 may not be provided with scale lines 19. In this case, the magnitude of the supporting force applied to the blank 2 can be determined by the amount of effort required to rotate the handle 7.

[0071] In this embodiment, the end of the push rod 6 is connected to a screw handle 7. The push rod 6 is driven to rotate by rotating the screw handle 7. In other embodiments, the end of the push rod 6 may not be provided with a screw handle 7. In this case, it is more difficult to operate by directly holding the push rod 6 to rotate it.

[0072] In this embodiment, the end limiting member 4 is adjustable along the axis of the mandrel 1, so that it can be used to support the blanks 2 of different lengths. In other embodiments, the end limiting member 4 can also be installed on the mandrel 1 with the axial position relatively fixed. In this case, it can only support blanks 2 of the same length.

Claims

1. A cutting device for machining a double-slip suspension assembly, comprising a positioning structure, the positioning structure including a spindle (1) and multiple support rods (9) mounted on the spindle (1), characterized in that, Multiple support rods (9) can be divided into multiple groups of support rods evenly arranged around the central axis of the mandrel (1). Each support rod group is supported on the inner side wall of the area in the blank (2) where the blank (3) is formed. Each support rod group includes two rows of support rods symmetrically arranged about the plane of the central axis of the mandrel (1). Each row of support rods includes multiple support rods (9) with the same extension direction arranged at intervals along the central axis of the mandrel (1). In the same support rod group, each support rod (9) in the two rows of support rods is arranged alternately along the central axis of the mandrel (1). The central axis of each support rod (9) is skewed from the central axis of the mandrel (1) so that the support rod (9) forms a tangential supporting force on the blank (2). The mandrel (1) is tubular, and a push rod (6) is coaxially inserted inside the mandrel (1). Multiple conical push blocks (10) are fixedly mounted on the push rod (6) and arranged at equal intervals along the length of the rod. The small diameter ends of each conical push block (10) face the same direction. Multiple support rods (9) whose rod axes are located in the same cross section of the mandrel (1) are called a ring of support rods. Each ring of support rods corresponds to the position of each conical push block (10), and the inner end of each support rod (9) is elastically pressed against the outer wall of the corresponding conical push block (10). The push rod (6) can move along the length of the rod to push each support rod (9) in the support rod group to extend or retract.

2. The cutting device for machining a double-slip type embedded in a suspension device according to claim 1, characterized in that, The mandrel (1) is fixedly installed with an mounting plate, and the push rod (6) is spirally inserted on the mounting plate. By rotating the push rod (6), each conical push block (10) can be driven to move back and forth along the axis of the mandrel (1).

3. The cutting device for machining a double-slip type embedded in a suspension device according to claim 2, characterized in that, The push rod (6) is provided with a scale line (19), which is located on the side where the mounting plate is located.

4. A cutting device for machining a double-slip type embedded in a suspension unit according to claim 3, characterized in that, The push rod (6) has a scale line at one end connected to a screw handle (7).

5. A cutting device for machining a suspension-embedded double slip according to any one of claims 1-4, characterized in that, The outer end of the support rod (9) is coaxially connected to a vibration damping component, which is elastically pressed against the inner wall of the card blank (2).

6. A cutting device for machining a suspension device with embedded double slips according to claim 5, characterized in that, The vibration damping assembly includes a vibration damping rod (8), the outer end of which is connected to a rubber head (11). The support rod (9) is hollow inside. The vibration damping rod (8) and the support rod (9) are slidably inserted coaxially inside the support rod (9) and are connected to an elastic element that can extend and retract along the axis of the support rod (9). The elastic element applies an elastic force to the vibration damping rod (8) in the opposite direction to the support rod (9) so that the rubber head (11) is pressed against the inner wall of the card blank (2).

7. A cutting device for machining a suspension-embedded double slip according to any one of claims 1-4, characterized in that, Two end limiting parts (4) are installed on the mandrel (1). The end limiting parts (4) are provided with annular grooves (404) for the end of the blank (2) to be inserted. The openings of the two annular grooves (404) on the two end limiting parts (4) are arranged opposite to each other.

8. A cutting device for machining a double slip embedded in a suspension unit according to claim 7, characterized in that, The position of the end limiter (4) on the mandrel (1) along the axis of the mandrel (1) is adjustable.

9. A cutting device for machining a double-slip type embedded in a suspension device according to claim 8, characterized in that, The mandrel (1) is provided with multiple threaded holes arranged at equal intervals along the axis of the mandrel (1), and the end limiting member (4) is provided with locking bolts (5). The locking bolts (5) can be screwed into different threaded holes to adjust the position of the end limiting member (4) in the axis of the mandrel (1).

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