Combined mandrel

Abstract

The invention discloses a combined core shaft which comprises a core shaft, the surface of the core shaft is provided with a protruding shaft shoulder and an assembling end far away from the shaft shoulder, and the surface of the core shaft is further provided with a clamping groove located between the shaft shoulder and the assembling end; the special-shaped roller sleeve is sleeved into the core shaft from the assembly end along the axial direction of the core shaft and is propped against the shaft shoulder; the height adjusting cylinder is sleeved into the core shaft from the assembly end along the axial direction of the core shaft and is propped against the special-shaped roller sleeve; the clamping ring is in an inferior arc shape, is clamped into the clamping groove in a matched mode and abuts against the height adjusting cylinder. The limiting ring is sleeved with the assembling end in the axial direction of the mandrel and kept on the outer side of the clamping ring to limit the clamping ring to slide in the radial direction of the mandrel. According to the combined mandrel, the special-shaped roller sleeve and the height adjusting cylinder are limited and fixed between the clamping groove and the shaft shoulder by arranging the clamping groove in the mandrel and the clamping ring and the limiting ring which are matched with the clamping groove, and the clamping ring can be quickly disassembled to relieve limitation on the special-shaped roller sleeve and the height adjusting cylinder after the limiting ring is taken out; and the purposes of quick replacement and non-destructive replacement of the special-shaped roller sleeve are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of special-shaped ring metal processing, and in particular relates to a combined mandrel used in a ring rolling machine. Background Art

[0002] The ring rolling mill processes and rolls annular metal workpieces through the cooperation of an active roll, a core roll and two centering rolls located on both sides. When processing annular metal workpieces with special-shaped cross-sections, special-shaped core rolls are also required.

[0003] On the one hand, the special-shaped core roller has point / line contact with the ring blank in the working state, which leads to large wear of the core roller. On the other hand, the special-shaped core roller has strong targeted processing workpiece when working, which leads to the need to replace the core roller frequently during the production process. The integrated core roller is not very versatile and wastes more materials. It is also inconvenient to replace.

[0004] The application document of Chinese patent CN104148396A discloses a core roller and a rolling forming method of a large inner step cross-section ring, wherein a core roller is used, which is composed of a core roller shaft and a combined groove. The core roller can separate the core roller shaft and the combined groove, and when the core roller is worn and needs to be replaced, only the combined groove can be replaced.

[0005] In the prior art, this combined spindle is tightened and fixed by a reverse fastening nut after compensation with a height adjustment tube, that is, the fastening nut is screwed into and abutted against the height adjustment tube through the thread cooperation of the fastening nut and the spindle. However, this assembly method of the reverse fastening nut will cause the reverse fastening nut to become tighter and tighter as the combined spindle rotates with the workpiece, and the spindle thread and gasket are deformed due to the force, resulting in the nut being unable to be disassembled normally. The reverse fastening nut can only be removed by violent destruction, which not only causes damage to the reverse fastening nut, but may even cause damage to the spindle thread and scrap the spindle. Summary of the invention

[0006] The present application provides a combined mandrel to solve the technical problem that the above-mentioned assembly method of the reverse fastening nut becomes tighter and tighter during the processing of special-shaped rings, resulting in deformation of the parts and making it impossible to disassemble the fastening nut normally.

[0007] The specific technical solutions are as follows: Combined mandrel, including: A mandrel, wherein the mandrel surface has a protruding shoulder and an assembly end away from the shoulder, and the mandrel surface also has a groove between the shoulder and the assembly end; The special-shaped roller sleeve is inserted into the mandrel along the axial direction of the mandrel from the assembly end and abuts against the shaft shoulder; The height adjustment cylinder is inserted into the mandrel along the axial direction of the mandrel from the assembly end and contacts the special-shaped roller sleeve; A snap ring, which is in an arc shape and fits into the slot and contacts the height adjustment tube; The limiting ring is inserted into the axial direction of the core shaft from the assembly end and is retained on the outer side of the clamping ring to limit the radial sliding of the clamping ring along the core shaft.

[0008] Furthermore, the width of the clamping groove along the axial direction of the core shaft is greater than or equal to the thickness of the clamping ring.

[0009] Furthermore, the number of the snap rings is at least two.

[0010] Furthermore, the clamping groove is arc-shaped, and the arc length of the clamping groove is equal to or greater than the clamping ring.

[0011] Furthermore, when the snap ring is inserted into the slot, at least one line extending from both ends in the diameter direction on the cross section of the core shaft passes through the snap ring at the same time.

[0012] Furthermore, the slot is in the shape of a closed ring.

[0013] Furthermore, when the snap rings are inserted into the slots and the two adjacent slots collide with each other, the slots not filled by the snap rings are inferior arcs; Or, after the snap rings are inserted into the snap grooves, they are adjacent to each other and abut against each other to form a closed ring shape.

[0014] Furthermore, the limiting ring has a limiting portion in the form of a closed ring and a resistance portion protruding from the inner side of the limiting portion, so that the cross-section of the limiting ring is L-shaped. In the assembled state, the resistance portion resists against the end face of the retaining ring, and the limiting portion connected to the resistance portion is maintained on the outer side of the retaining ring.

[0015] Furthermore, the limiting ring has a limiting portion in the shape of a closed ring and a conical surface 1 formed on the inner wall of the limiting portion, and a conical surface 2 is formed on the outer side of the retaining ring. In the assembled state, the conical surface 1 of the limiting portion fits against the conical surface 2 of the retaining ring.

[0016] Furthermore, the limiting ring has a limiting portion in the shape of a closed ring and a resistance portion formed by a protrusion from the inner side of the limiting portion, so that the cross-section of the limiting ring is L-shaped, the inner wall of the limiting portion is a conical surface one, and a conical surface two is formed on the outer side of the retaining ring. In the assembled state, the resistance portion resists against the end face of the retaining ring, and the limiting portion connected to the resistance portion is maintained on the outer side of the retaining ring, and the conical surface one and the conical surface two are in contact with each other or separated by a gap.

[0017] Furthermore, the clamping ring is provided with a through hole, the hole includes a constant diameter section and a reduced diameter section, the cross section of the constant diameter section is square, the cross section diameter of the reduced diameter section gradually decreases in the direction away from the constant diameter section, and the side length of the constant diameter section, the maximum size of the reduced diameter section, and the diameter of the spherical member are the same; A movable spherical member is arranged in the hole, and the spherical member is exposed to the outside of the clamp ring through the opening of the reduced diameter section; A stopper is arranged above the spherical member, and the stopper is inclined from outside to inside along the radial direction of the snap ring in the equal diameter section, and an end of the stopper facing the outer side of the arc of the snap ring is higher than an end of the stopper facing the inner side of the arc of the snap ring; The stopper is made of magnetic metal, and the limiting portion of the limiting ring is magnetic; In the assembled state, the limiting part absorbs the stopper so that the two ends of the stopper abut against the inner wall of the equal diameter section to lock and maintain the abutment state between the spherical part and the height adjustment cylinder.

[0018] Furthermore, a concave spherical portion is provided in the middle of the stopper, and the diameter of the spherical portion is the same as that of the spherical member.

[0019] Furthermore, the cross-section of the reduced diameter section is circular.

[0020] The beneficial effects of the present invention are as follows: the combined mandrel restricts and fixes the special-shaped roller sleeve and the height adjustment cylinder between the slot and the shaft shoulder by setting a slot on the mandrel and a retaining ring and a limiting ring that cooperate with the slot. The retaining ring can be quickly removed by taking out the limiting ring to release the restriction on the special-shaped roller sleeve and the height adjustment cylinder, thereby achieving the purpose of rapid and non-destructive replacement of the special-shaped roller sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 What is shown is a schematic diagram of the assembly completion of the combined mandrel; Figure 2 What is shown is a schematic diagram of the combined mandrel before assembly; Figure 3 Shown is the shape of the card slot; Figure 4 The shape of the first type of limit ring that cooperates with the snap ring is shown; Figure 5 The shape of the second limiting ring that cooperates with the snap ring is shown; Figure 6 The structure diagram of the spherical member disposed in the clamp ring is shown; Figure 7 Shown is a schematic diagram of the inner hole of the snap ring; Reference numerals: 100, core shaft; 101, shoulder; 102, groove; 200, special-shaped roller sleeve; 300, height adjustment cylinder; 400, retaining ring; 401, cone surface 2; 402, hole; 4021, equal diameter section; 4022, reduced diameter section; 403, spherical part; 404, stopper; 405, spherical part; 500, limiting ring; 501, limiting part; 502, interference part; 503, cone surface 1. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0023] Figure 1 The figure shows the completed assembly diagram of the combined mandrel. Figure 2 The schematic diagram of the combined mandrel before assembly is shown. The combined mandrel includes a mandrel 100. The outer surface of the mandrel 100 is sleeved with a special-shaped roller sleeve 200, a height adjustment sleeve 300, a clamping ring 400 and a limit ring 500. The surface of the mandrel 100 has a protruding shoulder 101, so that the special-shaped roller sleeve 200 fits on the surface of the mandrel 100 and contacts the shoulder 101. On this basis, the height adjustment sleeve 300 also fits on the surface of the mandrel 100 and contacts the special-shaped roller sleeve 200. The clamping ring 400 is provided from the outside. It is stuck on the core shaft 100 and contacts the other end of the height adjustment cylinder 300, so that the special-shaped roller sleeve 200, the height adjustment cylinder 300 and the retaining ring 400 remain relatively fixed in the axial direction of the core shaft 100. The limiting ring 500 is sleeved on the outside of the retaining ring 400 along the axial direction of the core shaft 100 to limit the failure of the retaining ring 400 caused by radial sliding with the height adjustment cylinder 300. That is, the limiting ring 500 is used to ensure the stable state of the special-shaped roller sleeve 200, the height adjustment cylinder 300 and the retaining ring 400 after being sleeved on the core shaft 100.

[0024] By making a core shaft 100 as a matrix, special-shaped roller sleeves 200 with different cross-sectional shapes are developed according to different products, and a height adjustment cylinder 300 is provided according to the height of the special-shaped roller sleeve 200, so that the sum of the heights of the special-shaped roller sleeve 200 and the height adjustment cylinder 300 is equal to the distance from the shoulder 101 on the core shaft 1 to the retaining ring 400.

[0025] As a structure matching the snap ring 400 , a snap groove 102 is also correspondingly provided on the core shaft 100 , and the width of the snap groove 102 along the axial direction of the core shaft 100 matches the thickness of the snap ring 400 so that the snap ring 400 can be snapped into during assembly.

[0026] In a specific embodiment, the width of the groove 102 along the axial direction of the core shaft 100 is equal to the thickness of the snap ring 400 .

[0027] In another specific embodiment, the width of the clamping groove 102 along the axial direction of the core shaft 100 is greater than the thickness of the clamping ring 400 .

[0028] The purpose of setting the retaining ring 400 is to form another protruding structure on the surface of the core shaft 100 that matches the shoulder 101 after the retaining ring 400 is inserted into the slot 102. The retaining ring 400 and the shoulder 101 form a stable limit, and the special-shaped roller sleeve 200 and the height adjustment cylinder 300 are restricted between the retaining ring 400 and the shoulder 101. At the same time, unlike the shoulder 101, the retaining ring 400 is a detachable structure to facilitate the replacement of the special-shaped roller sleeve 200. Therefore, the retaining ring 400 is set to an arc shape, and correspondingly, it is a inferior arc state, so that the retaining ring 400 can be more conveniently inserted into the slot 102 or removed from the slot 102.

[0029] In a specific embodiment, Figure 3 As shown in (A), the slot 102 is configured to be arc-shaped to match the snap ring 400 , but the arc length of the slot 102 is not limited to be equal to the arc length of the snap ring 400 , and may also be longer than the arc length of the snap ring 400 , in order to allow the snap ring 400 to be inserted at a fixed point.

[0030] In another specific embodiment, Figure 3 As shown in (B), the slot 102 is configured as a closed ring to improve the applicability of the snap ring 400. On the one hand, the snap ring 400 can be inserted into the slot 102 from any direction. On the other hand, the snap ring 400 of any arc length can be inserted into the slot 102.

[0031] The limit ring 500 used in conjunction with the retaining ring 400 in the present application is used to limit the radial sliding of the retaining ring 400 out of the retaining groove 102. Therefore, when the retaining ring 400 is inserted into the retaining groove 102, the limit ring 500 needs to be inserted axially along the core shaft 100 and maintained on the outside of the retaining ring 400. It should be noted that the rotating center axis of the combined core shaft needs to be set to a vertical state during use.

[0032] In a specific embodiment, see Figure 4 The limiting ring 500 has a limiting portion 501 in a closed ring shape and a resistance portion 502 protruding from the inner side of the limiting portion 501, so that the cross-section of the limiting ring 500 is L-shaped as a whole. In the assembled state, the resistance portion 502 will resist the end face of the retaining ring 400, thereby limiting the position of the limiting ring 500, so that the limiting portion 501 connected to the resistance portion 502 is always maintained on the outer side of the retaining ring 400.

[0033] In another specific embodiment, see Figure 5 The limiting ring 500 has a limiting portion 501 in a closed ring shape and a conical surface 503 formed on the inner wall of the limiting portion 501. The outer side of the clamping ring 400 is also correspondingly formed with a conical surface 401 to match the conical surface 503. Figure 5In the assembled state, the conical surface 1 503 of the limiting portion 501 will fit and abut against the conical surface 2 401 of the retaining ring 400. Since the conical surface 2 401 is smaller at the top and larger at the bottom in the axial direction of the core shaft 100, when the conical surface 1 503 fits and abuts against the conical surface 2 401, it will limit the sliding tendency of the limiting ring 500 along the axial direction of the core shaft 100, so that the limiting portion 501 is always maintained on the outside of the retaining ring 400. On the other hand, since the conical surface 1 503 is provided on the inner wall of the limiting portion 501, the inner wall of the limiting portion 501 presents a trumpet shape with a smaller bottom and a larger top, which makes it easier to put the limiting ring 500 on the outside of the retaining ring 400 during the assembly process.

[0034] In another specific embodiment, the limiting ring 500 may have a limiting portion 501 , a resisting portion 502 and a conical surface 1 503 formed on the inner wall of the limiting portion 501 . Correspondingly, a conical surface 2 401 is also formed on the outer side of the retaining ring 400 .

[0035] Since the snap ring 400 is provided as a minor arc, the number of the snap rings 400 is provided to be at least two.

[0036] In a specific embodiment, the card slot 102 is configured as Figure 3 The closed ring shape shown in (B) enables the unfilled slot 102 of the snap ring 400 to be a minor arc when two adjacent ones of the snap ring 400 are in contact with each other after being inserted into the slot 102, or the snap ring 400 can directly be in a closed ring shape when two adjacent ones of the snap ring 400 are in contact with each other after being inserted into the slot 102. In this state, it can be ensured that no matter what position the snap ring 400 is in the slot 102, the limit ring 500 can remain coaxial with the central axis of the core shaft 100 without radial shaking.

[0037] In another specific embodiment, the card slot 102 is configured as Figure 3 The non-closed arc shown in (A) allows at least one line extending in the diameter direction on the cross section of the core shaft 100 to pass through the retaining ring 400 when the retaining ring 400 is inserted into the retaining groove 102. Similarly, this state is also to ensure that no matter what position the retaining ring 400 is in the retaining groove 102, the limit ring 500 can remain coaxial with the central axis of the core shaft 100 without radial shaking.

[0038] In some application scenarios, due to processing accuracy, wear and tear, assembly errors, etc., after the retaining ring 400, the limit ring 500, the special-shaped roller sleeve 200 and the height adjustment cylinder 300 are assembled on the core shaft 100, there is no conflict between the height adjustment cylinder 300 and the retaining ring 400, which inevitably causes a certain amount of axial movement of the special-shaped roller sleeve 200 on the core shaft 100.

[0039] See also Figure 6A through hole 402 is provided on the retaining ring 400, a spherical member 403 is placed in the hole 402, and a stopper 404 is placed above the spherical member 403. When the spherical member 403 is placed in the hole 402, part of the spherical member 403 will be exposed from the lower end of the hole 402, and the exposed part of the spherical member 403 can fill the gap between the height adjustment cylinder 300 and the retaining ring 400 to limit the height adjustment cylinder 300; the stopper 404 placed in the hole 402 is used to limit the position of the spherical member 403, especially the stopper 404 contacts the spherical member 403 and further limits the spherical member 403 from retracting into the hole 402.

[0040] Figure 7 What is shown is a schematic diagram of the structure of the hole 402, which includes a constant diameter section 4021 and a reduced diameter section 4022. The constant diameter section 4021 can accommodate the spherical member 403 and allow the spherical member 403 to move axially therein, and the reduced diameter section 4022 is used to limit the extreme state of the spherical member 403, especially to limit the spherical member 403 from sliding out of the hole 402.

[0041] On the other hand, the cross-section of the equal-diameter section 402 is set to a square, and the cross-section of the reduced-diameter section 4022 is set to a circle matching the spherical member 403, and the cross-sectional diameter of the reduced-diameter section 4022 gradually decreases in the direction away from the equal-diameter section 402 to match the spherical surface of the spherical member 403, and the side length of the equal-diameter section 402, the maximum diameter of the reduced-diameter section 4022, and the diameter of the spherical member 403 are the same.

[0042] Combination Figure 6 The stopper 404 is in the form of a sheet, and when the stopper 404 is placed in the equal diameter section 402 and contacts the spherical member 403 to stabilize, the stopper 404 is in an inclined state, that is, the end of the stopper 404 facing the outer side of the arc of the snap ring 400 is higher than the end of the arc of the inner side of the arc of the snap ring 400. Figure 6 In the state shown, a section is formed along the diameter direction of the clamping ring 400 , and the length of the stopper 404 is also greater than the width of the equal diameter section 402 .

[0043] On the basis of the above records, the stopper 404 is correspondingly set to be a magnetic metal, and the limiting portion 501 of the limiting ring 500 is set to be magnetic. During the assembly process, the special-shaped roller sleeve 200 and the height adjustment cylinder 300 are successively put on the core shaft 100, and then the retaining ring 400 is inserted into the slot 102. During this process, the main body of the core shaft 100 is arranged in a vertical state, and the spherical member 403 inside the retaining ring 400 will be located at the extreme position of the reduced diameter section 4022 due to the action of gravity. As the retaining ring 400 is assembled, the spherical member 403 will naturally contact the end of the height adjustment cylinder 300 and be affected by the resistance and retract a part of it into the equal diameter section 402. During this process, the stopper 404 can also retreat synchronously with the spherical member 403; after the limiting ring 500 is subsequently installed, since the limiting portion 501 of the limiting ring 500 is magnetic, it will The stopper 404 is adsorbed so that the high end of the stopper 404 abuts against the inner wall of the equal-diameter section 402. The stopper 404 and the inner wall of the equal-diameter section 402 generate friction to limit the movement of the stopper 404 in the equal-diameter section 402. In addition, the stopper 404 is inclined in the equal-diameter section 402. The other end of the stopper 404 is limited by its length and also abuts against the inner wall of the equal-diameter section 402, so that the stopper 404 forms a locked state in the equal-diameter section 402, which is used to maintain the abutment state between the spherical member 403 and the height adjustment cylinder 300, that is, the part of the spherical member 403 protruding from the retaining ring 40 can fill the gap between the compensation height adjustment cylinder 300 and the retaining ring 400, so that the height adjustment cylinder 30 is maintained in the abutment limit state, so as to avoid the movement of the special-shaped roller sleeve 200 on the core shaft 100 to a certain extent.

[0044] In some embodiments, a concave spherical portion 405 is further provided in the middle of the stop member 404, and the diameter of the spherical portion 405 is the same as that of the spherical member 403, so that the stop member 404 fits the spherical member 403 through the spherical portion 405 in the equal-diameter section 402, replacing point contact with surface contact, thereby increasing the stability of the stop member 404 in the equal-diameter section 402, and making it easier to retract synchronously with the spherical member 403 during the assembly process, thereby avoiding the stop member 404 from getting stuck in the equal-diameter section 402.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. Combined mandrel, characterized in that: include: A mandrel, wherein the mandrel surface has a protruding shoulder and an assembly end away from the shoulder, and the mandrel surface also has a groove between the shoulder and the assembly end; The special-shaped roller sleeve is inserted into the mandrel along the axial direction of the mandrel from the assembly end and abuts against the shaft shoulder; The height adjustment cylinder is inserted into the mandrel along the axial direction of the mandrel from the assembly end and contacts the special-shaped roller sleeve; A snap ring, which is in an arc shape and fits into the slot and contacts the height adjustment tube; The limiting ring is inserted into the axial direction of the core shaft from the assembly end and is retained on the outer side of the clamping ring to limit the radial sliding of the clamping ring along the core shaft.

2. The combined mandrel according to claim 1, characterized in that: The width of the groove along the axial direction of the core shaft is greater than or equal to the thickness of the retaining ring; the number of the retaining rings is at least two; the groove is arc-shaped, and the arc length of the groove is equal to or greater than the retaining ring; the groove is a closed ring.

3. The combined mandrel according to claim 2, characterized in that: When the clamping ring is clamped into the clamping groove, at least one line extending from both ends in the diameter direction on the cross section of the core shaft passes through the clamping ring at the same time.

4. The combined mandrel according to claim 1, characterized in that: When the snap rings are inserted into the slots and they collide with each other, the slots not filled by the snap rings are inferior arcs; Or after the snap rings are inserted into the snap grooves, they are adjacent to each other and abut against each other to form a closed ring shape.

5. The combined mandrel according to claim 1, characterized in that: The limiting ring has a limiting portion in the shape of a closed ring and a resistance portion formed by protruding from the inner side of the limiting portion, so that the cross section of the limiting ring is L-shaped. In the assembled state, the resistance portion resists against the end face of the clamping ring, and the limiting portion connected to the resistance portion is maintained on the outer side of the clamping ring.

6. The combined mandrel according to claim 1, characterized in that: The limiting ring has a limiting portion in a closed ring shape and a conical surface 1 formed on the inner wall of the limiting portion. A conical surface 2 is formed on the outer side of the clamping ring. In the assembled state, the conical surface 1 of the limiting portion fits against the conical surface 2 of the clamping ring.

7. The combined mandrel according to claim 1, characterized in that: The limiting ring has a limiting portion in the shape of a closed ring and a resistance portion formed by a protrusion from the inner side of the limiting portion, so that the cross-section of the limiting ring is L-shaped, the inner wall of the limiting portion is a conical surface 1, and the outer side of the retaining ring is formed with a conical surface 2. In the assembled state, the resistance portion resists against the end face of the retaining ring, and the limiting portion connected to the resistance portion is maintained on the outer side of the retaining ring, and the conical surface 1 and the conical surface 2 are in contact with each other or separated by a gap.

8. The combined mandrel according to claim 1, characterized in that: The clamping ring is provided with a through hole, the hole includes a constant diameter section and a reduced diameter section, the cross section of the constant diameter section is square, the cross section diameter of the reduced diameter section gradually decreases in the direction away from the constant diameter section, and the side length of the constant diameter section, the maximum size of the reduced diameter section, and the diameter of the spherical piece are the same; A movable spherical member is arranged in the hole, and the spherical member is exposed to the outside of the clamp ring through the opening of the reduced diameter section; A stopper is arranged above the spherical member, and the stopper is inclined from outside to inside along the radial direction of the snap ring in the equal diameter section, and an end of the stopper facing the outer side of the arc of the snap ring is higher than an end of the stopper facing the inner side of the arc of the snap ring; The stopper is made of magnetic metal, and the limiting portion of the limiting ring is magnetic; In the assembled state, the limiting part absorbs the stopper so that the two ends of the stopper abut against the inner wall of the equal diameter section to lock and maintain the abutment state between the spherical part and the height adjustment cylinder.

9. The combined mandrel according to claim 8, characterized in that: A concave spherical portion is provided in the middle of the stopper, and the diameter of the spherical portion is the same as that of the spherical member.

10. The combined mandrel according to claim 8, characterized in that: The cross section of the reduced diameter section is circular.

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