Sectional type mandrel

Abstract

The utility model discloses a sectional type core shaft, which relates to the technical field of equipment parts of large ring rolling mills, and comprises an upper core shaft, a lower core shaft and a core shaft locking ring, and the upper core shaft and the lower core shaft are connected by adopting a concave-convex structure; the sectional type mandrel is adopted to replace a traditional integrated mandrel, and a more economical, efficient and reliable solution is provided for a large ring rolling mill. The sectional type core shaft can be specifically replaced according to abrasion and deformation positions, the whole core shaft is prevented from being replaced, and the maintenance cost can be remarkably reduced; the sectional type design allows the damaged mandrel part to be quickly replaced, so that the downtime of the machine is reduced, and the production efficiency is improved; the sectional mandrel is assembled by adopting a welding and shrinkage fit process, so that the durability of the connecting part of the mandrel can be enhanced, the service life of the mandrel can be prolonged, and the stability of the mandrel in a high-temperature environment can be improved; and by reducing the requirement for replacing the whole mandrel, the sectional type design is beneficial to reducing material waste, and the concept of sustainable development is met.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment parts of large-scale ring rolling machines, in particular to a segmented core shaft. Background Art

[0002] In the prior art, the mandrel of a large ring rolling machine adopts an integrated structure. The integrated mandrel is usually made of high-strength materials to withstand the high temperature and mechanical stress in the production process. The entire mandrel is used as a single part to ensure its structural integrity and consistency of machining. During the production process, the lower end of the mandrel is in direct contact with the high-temperature ring forging for a long time, which requires the mandrel material to have not only good thermal stability but also excellent mechanical properties to resist shear force and pressure. However, due to being in a high temperature and high shear force operating environment for a long time, the lower end of the mandrel is prone to deformation and wear. This wear and deformation will gradually affect the accuracy of the machine, and eventually lead to a decrease in the accuracy of the entire mandrel, which cannot meet production requirements. Once the mandrel accuracy is reduced, according to the existing integrated mandrel structure, the mandrel usually needs to be replaced as a whole. This replacement not only increases the risk of production interruption, but also brings about a significant increase in material and labor costs, resulting in a large cost waste. How to reduce the replacement cost caused by mandrel wear and deformation while ensuring production efficiency and machine accuracy is the main technical challenge facing the current large ring rolling machine design.

[0003] The core roller of a ring rolling machine with application number: CN201822240169.0 provides an integrated core shaft. When the core shaft needs to be replaced, the entire core shaft needs to be replaced. This replacement not only increases the risk of production interruption, but also brings about a significant increase in material and labor costs, thereby causing a large waste of costs. Utility Model Content

[0004] The purpose of the utility model is to provide a segmented mandrel to solve the problem that the integrated mandrel structure in the prior art proposed in the above background technology needs to be replaced as a whole when the mandrel needs to be replaced. Such replacement not only increases the risk of production interruption, but also brings about a significant increase in material and labor costs, thereby causing a large cost waste.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a segmented mandrel, including a vertical segmented mandrel and a mandrel upper support seat and a mandrel lower support seat are respectively arranged at the upper and lower ends of the mandrel; the segmented mandrel includes an upper mandrel at an upper portion and a lower mandrel at a lower portion, and a mandrel locking ring is arranged on the outer side of the connecting portion of the upper mandrel and the lower mandrel; the upper mandrel includes a first upper mandrel at an upper portion and a second upper mandrel at a lower portion, which are coaxially arranged cylindrically, the diameter of the second upper mandrel is larger than the diameter of the first upper mandrel, and the diameter of the second upper mandrel is A cylindrical concave upper core shaft groove is arranged at the axis center of the bottom end; the lower core shaft comprises a first lower core shaft with a cylindrical upper portion and a second lower core shaft with a cylindrical lower portion coaxially arranged above and below, the diameter of the first lower core shaft is equal to the diameter of the second upper core shaft, and the diameter of the second lower core shaft is smaller than the diameter of the first lower core shaft; a cylindrical convex lower core shaft block matching the upper core shaft groove is arranged at the axis center of the top end of the first lower core shaft; the core shaft locking ring is arranged in a circular ring shape, and its inner diameter is equal to the outer diameters of the second upper core shaft and the first lower core shaft.

[0006] Preferably, an upper core shaft reducing bevel is provided on the outer side wall of the second upper core shaft near the top end; an inwardly concave threaded hole is provided at the top axis of the first upper core shaft, which is connected and fixed to the core shaft upper support seat by bolts.

[0007] Preferably, a lower mandrel diameter reducing bevel is provided on the outer side wall of the second lower mandrel close to the top end, and a downwardly inclined welding bevel is provided on the outer side wall of the top end of the first lower mandrel on the plane with the outer side of the lower mandrel protrusion.

[0008] Preferably, the bottom surface of the second upper core shaft is fixed to the welding bevel by welding.

[0009] Preferably, after the bottom surface of the second upper core shaft is welded to the welding bevel, the outer diameter is machined with a minimum turning amount to ensure concentricity.

[0010] Preferably, a welding groove obliquely downward from outside to inside is provided at the top of the inner wall of the mandrel locking ring, and a locking ring inclined surface obliquely downward from outside to inside is provided at the bottom end of the mandrel locking ring between the inner and outer walls.

[0011] Preferably, the mandrel locking ring is heated to 870° and then heat-shrunk onto the outside of the welding portion between the second upper mandrel and the first lower mandrel, and the outer wall of the second upper mandrel is fixed to the welding groove by welding.

[0012] Preferably, the diameter of the second lower mandrel is equal to the diameter of the first upper mandrel.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model provides a segmented mandrel to replace the traditional integrated mandrel to cope with some challenges encountered by large ring rolling machines in the production process; the segmented mandrel can be replaced specifically according to the wear and deformation position without replacing the entire mandrel, which can significantly reduce maintenance costs; the segmented design allows for quick replacement of damaged mandrel parts, reduces machine downtime, and improves production efficiency; the concave-convex connection structure of the upper mandrel groove and the lower mandrel protrusion can ensure that the mandrel still maintains high precision after the replacement of the parts; the assembly of the segmented mandrel adopts welding and heat-shrinking processes, which can enhance the durability of the mandrel connection part and extend the service life of the mandrel; the minimum turning amount after welding can ensure the concentricity of the mandrel, thereby improving the quality of the product; the heat-shrinking process can ensure the close fit between the mandrel lock ring and the mandrel, and improve the stability in a high temperature environment; by reducing the need to replace the entire mandrel, the segmented design helps to reduce material waste and conforms to the concept of sustainable development; the segmented mandrel provides a more economical, efficient and reliable solution for large ring rolling machines through its unique structure and connection method. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 Schematic diagram of the upper mandrel;

[0017] Figure 3 is a schematic diagram of the lower mandrel;

[0018] Figure 4 It is a schematic diagram of the mandrel lock ring;

[0019] Figure 5 It is a schematic diagram of the assembly of the segmented mandrel;

[0020] Figure 6 for Figure 5 A magnified view of middle;

[0021] Figure 7 It is a schematic diagram of the assembly of the integrated mandrel and the ring rolling machine;

[0022] In the figure: upper mandrel -1, first upper mandrel -11, second upper mandrel -12, upper mandrel reducing bevel -13, threaded hole -14, upper mandrel groove -15, lower mandrel -2, first lower mandrel -21, second lower mandrel -22, lower mandrel reducing bevel -23, lower mandrel protrusion -24, welding bevel -25, mandrel locking ring -3, welding groove -31, locking ring bevel -32. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the technical solution in the embodiments of the present utility model is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Please refer to Figure 1-7 , Figure 1 It is a schematic diagram of the structure of the utility model; Figure 2 Schematic diagram of the upper mandrel; Figure 3 is a schematic diagram of the lower mandrel; Figure 4 It is a schematic diagram of the mandrel lock ring; Figure 5 It is a schematic diagram of the assembly of the segmented mandrel; Figure 6 for Figure 5 A magnified view of middle; Figure 7 It is a schematic diagram of the assembly of the integrated mandrel and ring rolling machine.

[0025] The utility model provides a segmented mandrel used as the mandrel of a large ring rolling machine; it comprises a vertical segmented mandrel, wherein an upper mandrel support seat and a lower mandrel support seat are respectively arranged at the upper and lower ends of the segmented mandrel for connecting with the large ring rolling machine.

[0026] The segmented mandrel comprises an upper mandrel 1 and a lower mandrel 2 . A mandrel locking ring 3 is disposed on the outer side of the connection portion between the upper mandrel 1 and the lower mandrel 2 .

[0027] The upper core shaft 1 includes a first upper core shaft 11 and a second upper core shaft 12, which are coaxially arranged cylindrically. The diameter of the second upper core shaft 12 is larger than the diameter of the first upper core shaft 11, and an upper core shaft reducing slope 13 is provided on the outer side wall of the second upper core shaft 12 near the top. A concave threaded hole 14 is provided at the top axis of the first upper core shaft 11 for connecting and fixing with the core shaft upper support seat using bolts; a cylindrical concave upper core shaft groove 15 is provided at the bottom axis of the second upper core shaft 12 for connecting and fixing with the lower core shaft 2 for use.

[0028] The lower core shaft 2 includes a first lower core shaft 21 and a second lower core shaft 22, which are coaxially arranged cylindrically. The diameter of the first lower core shaft 21 is equal to the diameter of the second upper core shaft 12, and the diameter of the second lower core shaft 22 is equal to the diameter of the first upper core shaft 11. A lower core shaft reducing slope 23 is provided on the outer wall near the top end of the second lower core shaft 22, and a cylindrical convex lower core shaft block 24 is provided at the top axis of the first lower core shaft 21, which can be connected to the upper core shaft groove 15 through a concave-convex connection structure; a downwardly inclined welding slope 25 is provided on the outer wall of the top end of the first lower core shaft 21 on the plane outside the lower core shaft block 24, and the upper core shaft 1 and the lower core shaft 2 are welded and fixed by the welding slope 25; the bottom end of the second lower core shaft 22 is connected to the core shaft lower support seat.

[0029] The mandrel locking ring 3 is in a circular shape, and its inner diameter is equal to the outer diameter of the second upper mandrel 12 and the first lower mandrel 21. The top of the inner wall of the mandrel locking ring 3 is provided with a welding groove 31 which is inclined downward from the outside to the inside, and can be welded and fixed to the second upper mandrel 12 by welding; the bottom end of the mandrel locking ring 13 is provided with a locking ring inclined surface 32 which is inclined downward from the outside to the inside between the inner and outer walls;

[0030] When assembling the segmented mandrel, the lower mandrel protrusion 24 is matched and inserted into the inner side of the upper mandrel groove 15, and then welded and fixed between the bottom surface of the second upper mandrel 12 and the welding bevel 25; after welding, the outer diameter is processed with the minimum turning amount to ensure concentricity; then the mandrel locking ring 3 is heated to 870° and hot-fitted on the outer side of the welding part of the second upper mandrel 12 and the first lower mandrel 21, and after it cools down, it is welded and fixed between the outer wall of the second upper mandrel 12 and the welding groove 31, thereby completing the assembly of the segmented mandrel.

[0031] The utility model provides a segmented mandrel to replace the traditional integrated mandrel to cope with some challenges encountered by large ring rolling machines in the production process; the segmented mandrel can be replaced specifically according to the wear and deformation position without replacing the entire mandrel, which can significantly reduce maintenance costs; the segmented design allows for quick replacement of damaged mandrel parts, reduces machine downtime, and improves production efficiency; the concave-convex connection structure of the upper mandrel groove and the lower mandrel protrusion can ensure that the mandrel still maintains high precision after the replacement of the parts; the assembly of the segmented mandrel adopts welding and heat-shrinking processes, which can enhance the durability of the mandrel connection part and extend the service life of the mandrel; the minimum turning amount after welding can ensure the concentricity of the mandrel, thereby improving the quality of the product; the heat-shrinking process can ensure the close fit between the mandrel lock ring and the mandrel, and improve the stability in a high temperature environment; by reducing the need to replace the entire mandrel, the segmented design helps to reduce material waste and conforms to the concept of sustainable development; the segmented mandrel provides a more economical, efficient and reliable solution for large ring rolling machines through its unique structure and connection method.

[0032] Although the embodiments of the utility model have been shown and described, it is obvious that the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, it can be understood by ordinary technicians in this field that all other embodiments obtained by making various changes, modifications, substitutions and variations to these embodiments without departing from the principle and spirit of the utility model and without making creative work, all belong to the scope of protection of the utility model.

Claims

1. A segmented mandrel, characterized in that: The invention comprises a vertical segmented mandrel and an upper mandrel support seat and a lower mandrel support seat are respectively arranged at the upper and lower ends of the mandrel; the segmented mandrel comprises an upper mandrel (1) and a lower mandrel (2), and a mandrel locking ring (3) is arranged on the outer side of the connecting part of the upper mandrel (1) and the lower mandrel (2); the upper mandrel (1) comprises an upper first upper mandrel (11) and a lower second upper mandrel (12) which are coaxially arranged cylindrically, the diameter of the second upper mandrel (12) is larger than the diameter of the first upper mandrel (11), and a cylindrical upper mandrel groove (15) is arranged at the bottom axis of the second upper mandrel (12) ; The lower mandrel (2) comprises a first lower mandrel (21) and a second lower mandrel (22) which are coaxially arranged cylindrically on the upper and lower parts, the diameter of the first lower mandrel (21) being equal to the diameter of the second upper mandrel (12), and the diameter of the second lower mandrel (22) being smaller than the diameter of the first lower mandrel (21); a cylindrical convex lower mandrel bump (24) matching the upper mandrel groove (15) is arranged at the top axis of the first lower mandrel (21); the mandrel locking ring (3) is arranged in a circular ring shape, and its inner diameter is equal to the outer diameter of the second upper mandrel (12) and the first lower mandrel (21).

2. The segmented mandrel according to claim 1, characterized in that: An upper core shaft reducing inclined surface (13) is arranged on the outer side wall of the second upper core shaft (12) near the top end; an inner concave threaded hole (14) is arranged at the top axis of the first upper core shaft (11) and is connected and fixed to the core shaft upper support seat by bolts.

3. The segmented mandrel according to claim 2, characterized in that: A lower core shaft diameter reduction slope (23) is provided on the outer side wall of the second lower core shaft (22) near the top end, and a downwardly inclined welding slope (25) is provided on the outer side wall of the top end of the first lower core shaft (21) on the plane of the outer side of the lower core shaft protrusion (24).

4. The segmented mandrel according to claim 3, characterized in that: The bottom surface of the second upper core shaft (12) is fixedly welded to the welding bevel (25).

5. The segmented mandrel according to claim 4, characterized in that: After the bottom surface of the second upper core shaft (12) is welded to the welding bevel (25), the outer diameter is machined with a minimum turning amount to ensure concentricity.

6. The segmented mandrel according to claim 5, characterized in that: The top end of the inner wall of the mandrel locking ring (3) is provided with a welding groove (31) which is inclined downward from the outside to the inside, and the bottom end of the mandrel locking ring (3) is provided with a locking ring inclined surface (32) which is inclined downward from the outside to the inside between the inner and outer walls.

7. The segmented mandrel according to claim 6, characterized in that: The mandrel locking ring (3) is heated to 870° and then heat-fitted onto the outer side of the welding portion between the second upper mandrel (12) and the first lower mandrel (21), and the outer wall of the second upper mandrel (12) and the welding groove (31) are welded and fixed.

8. The segmented mandrel according to any one of claims 1 to 7, characterized in that: The diameter of the second lower mandrel (22) is equal to the diameter of the first upper mandrel (11).

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