Efficient dismounting core roller structure for hot ring rolling machine

Abstract

This utility model relates to the technical field of hot ring rolling machine components, specifically to a highly efficient disassembly mandrel structure for hot ring rolling machines. It includes a mandrel body, which comprises a main shaft section for assisting in ring rolling and a mounting section for connecting to the ring rolling machine. The mounting section includes a tapered section with an annular groove. After a tapered sleeve is fitted onto the tapered section, a cavity is formed between the annular groove and the inner wall of the tapered sleeve. This utility model's mandrel structure has advantages such as efficient disassembly, high structural strength, reasonable stress distribution, and stable operation, reducing the frequency of equipment failures and downtime, and lowering maintenance costs.

Description

Technical Field

[0001] This utility model relates to the technical field of hot ring rolling machine components, specifically to a high-efficiency disassembly mandrel structure for hot ring rolling machines. Background Technology

[0002] In the forging process of bearings, the rolling and expanding process is a crucial step. This process mainly relies on the coordinated operation of the rolling rollers and mandrel on the rolling and expanding machine to achieve precise hole expansion of the workpiece. In actual production, the mandrel of the rolling and expanding machine gradually ages over time. When the mandrel shows signs of aging, it needs to be replaced with a brand new mandrel in a timely manner, and the old mandrel should be repaired. Moreover, since different types of bearings have specific process requirements, different mandrels are needed to match them. Therefore, when changing the type of bearing to be processed, the mandrel must also be changed simultaneously.

[0003] A bushing is fitted over the mounting end of the mandrel. When the bushing is removed from the mandrel, the two often become tightly bonded together. This makes direct repair and replacement of the mandrel impossible; the bushing and mandrel must first be separated. Currently, the common separation method in the industry is to heat the mandrel, then manually clamp it with pliers and forcefully drop it. Often, this requires repeated operations to successfully separate the bushing from the mandrel. This disassembly is complex and can easily affect the structural precision of the mandrel.

[0004] In the prior art, patent application CN117798598A discloses a method for disassembling a rolling mandrel and a bushing. The bushing is surrounded by an induction coil in a high-frequency furnace. The induction coil heats up when energized, thus heating the bushing. The heating temperature of the induction coil is controlled between 300℃ and 500℃ to achieve quick and easy separation of the bushing and mandrel without damaging the components. However, during the heating process, both the bushing and the mandrel expand due to heat, resulting in a large adhesive area between them, which may make separation difficult. Utility Model Content

[0005] This invention provides a highly efficient disassembly mandrel structure for a hot ring rolling machine, to solve the technical problem in the prior art that the mandrel is not easy to separate from the tapered sleeve during disassembly and replacement.

[0006] To solve the above problems, the present invention provides a high-efficiency disassembly mandrel structure for a hot ring rolling machine, which adopts the following technical solution:

[0007] The device includes a core roller body, which includes a main shaft section for assisting in ring rolling and an installation section for connecting to a ring rolling machine. The installation section includes a tapered section with an annular groove. After a tapered sleeve is fitted onto the tapered section, a cavity is formed between the annular groove and the inner wall of the tapered sleeve.

[0008] Furthermore, the depth of the annular groove is 0.5-3 mm.

[0009] Furthermore, the annular grooves on the conical segment are n spaced apart, where n≥2.

[0010] Furthermore, the total width of each annular groove is L1, and the length of the conical segment is L2, where L1∶L2=1∶1.5-3.

[0011] Furthermore, a transition section is provided between the tapered section and the main shaft section.

[0012] Furthermore, a straight connecting section is provided between the transition section and the tapered section, and the length of the straight connecting section is 5mm.

[0013] The beneficial effects of the high-efficiency disassembly mandrel structure for a hot rolling mill provided by this utility model are:

[0014] 1. This utility model incorporates an annular groove to create a cavity between the conical section and the conical sleeve. This design effectively reduces the contact area between the outer wall of the conical section and the inner wall of the conical sleeve, thereby reducing the adhesion area during disassembly. The disassembly process is gentler, allowing operators to separate the core roller body and the conical sleeve without excessive external force, significantly reducing disassembly difficulty and improving efficiency. It also reduces the risk of damage to the core roller body and the conical sleeve, avoiding surface scratches and deformation caused by forced disassembly, and ensuring the integrity and precision of the components.

[0015] 2. By reasonably limiting the depth and width of the annular groove, this utility model can ensure that a suitable cavity is formed for easy disassembly, while avoiding local stress concentration in the core roller body due to the annular groove being too wide or too long. This ensures that the core roller body has sufficient overall rigidity, prevents structural damage such as cracks or fractures in key parts, and ensures the structural stability and reliability of the core roller body under long-term high-load operation.

[0016] 3. In this invention, a transition section is provided between the conical section and the main shaft section, and a straight connecting section with a length of 5mm is provided between the transition section and the conical section. The transition section achieves a smooth transition between the conical section and the main shaft section, avoiding stress concentration caused by abrupt structural changes. The straight connecting section further strengthens the connection between the transition section and the conical section, better bearing tensile and compressive stresses, effectively dispersing stress, and preventing structural damage such as cracks or fractures at the connection point. These designs make the overall structure of the core roller body more coherent and stable, enhance the rigidity of the core roller, and improve its resistance to deformation and damage, thereby ensuring the stability of the equipment during operation. Attached Figure Description

[0017] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a front view of the present invention;

[0020] Figure 3 This is a cross-sectional view of the present invention;

[0021] Figure 4 for Figure 3 A magnified view of a portion of region A in the middle.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Core roller body; 11. Main shaft section; 12. Mounting section; 121. Conical section; 122. Annular groove; 123. Cavity; 13. Transition section; 14. Straight connecting section. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] The number of any elements in the accompanying drawings is for illustrative purposes only and not as a limitation, and any naming is for distinction only and has no limiting meaning.

[0026] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0027] Embodiment 1 of a high-efficiency disassembly mandrel structure for a hot rolling mill provided by this utility model:

[0028] like Figures 1 to 4 As shown,

[0029] The machine includes a core roller body 1, which includes a main shaft section 11 for assisting in ring rolling and an installation section 12 for connecting to the ring rolling machine. The installation section 12 includes a tapered section 121, which has an annular groove 122. After a tapered sleeve is fitted onto the tapered section 121, a cavity 123 is formed between the annular groove 122 and the inner wall of the tapered sleeve.

[0030] By setting the annular groove 122, a cavity 123 is formed between the tapered section 121 and the tapered sleeve. The cavity 123 reduces the contact area between the outer wall of the tapered section 121 and the inner wall of the tapered sleeve, thereby reducing the bonding area between the two during disassembly. The disassembly process is gentler, reducing the risk of damage to the core roller body 1 and the tapered sleeve, ensuring the integrity and precision of the parts, and facilitating subsequent reuse.

[0031] The depth of the annular groove 122 is 0.5 mm.

[0032] The width of the annular groove 122 is L1, and the length of the conical segment 121 is L2, where L1∶L2=1∶1.5.

[0033] The above-mentioned structural constraints ensure that the core roller body 1 has sufficient overall rigidity, that is, avoid affecting the structural strength of the core roller body 1 itself, avoid local stress concentration caused by the annular groove 122 being too wide or too long, thereby preventing structural damage such as cracks or fractures in key parts of the core roller body 1, and ensuring the structural stability and reliability of the core roller body 1 under long-term high-load operation.

[0034] On the other hand, it ensures the formation of a suitable cavity 123, which facilitates the separation operation between the sleeve and the conical sleeve.

[0035] The tapered section 121 and the main shaft section 11 are located in a transition section 13.

[0036] A straight connecting section 14 is provided between the transition section 13 and the tapered section 121, and the length of the straight connecting section 14 is 5mm.

[0037] The transition section 13 achieves a smooth transition between the tapered section 121 and the main shaft section 11. During the operation of the mandrel body 1, the stress conditions of different functional areas vary significantly. The main shaft section 11 mainly bears the radial force during the rolling process, while the tapered section 121 bears the axial and radial forces generated by its engagement with the tapered sleeve. The transition section 13 avoids stress concentration caused by abrupt structural changes, making the overall structure of the mandrel body 1 more coherent and stable, thereby enhancing the rigidity of the mandrel and improving its resistance to deformation and damage.

[0038] In addition, the 5mm long straight connecting section 14 further strengthens the connection between the transition section 13 and the tapered section 121. The straight structure can better withstand tensile and compressive stresses. When the core roller body 1 is subjected to complex loads, the straight connecting section 14 can effectively disperse the stress, prevent structural damage such as cracks or fractures at the connection point, and ensure the long-term stable operation of the core roller body 1.

[0039] Embodiment 2 of the high-efficiency disassembly mandrel structure for a hot rolling mill provided by this utility model:

[0040] The difference between this embodiment and Embodiment 1 is that the annular grooves 122 on the conical segment 121 are two spaced-apart grooves.

[0041] The total width of the two annular grooves 122 is L1, and the length of the conical section is L2, where L1∶L2=1∶2. The two annular grooves 122, which are spaced apart, can better disperse the stress concentration area and ensure the fatigue resistance and structural strength of the core roller body 1.

[0042] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0043] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A high-efficiency disassembly mandrel structure for a hot ring rolling machine, comprising a mandrel body (1), said mandrel body (1) including a main shaft section (11) for assisting in ring rolling and a mounting section (12) for connecting to the ring rolling machine, characterized in that, The installation section (12) includes a tapered section (121), on which an annular groove (122) is provided. After a tapered sleeve is fitted onto the tapered section (121), a cavity (123) is formed between the annular groove (122) and the inner wall of the tapered sleeve.

2. The high-efficiency disassembly mandrel structure for a hot rolling mill according to claim 1, characterized in that, The depth of the annular groove (122) is 0.5-3 mm.

3. The high-efficiency disassembly mandrel structure for a hot rolling mill according to any one of claims 1 or 2, characterized in that, The annular grooves (122) on the conical segment (121) are n spaced apart, where n≥2.

4. The high-efficiency disassembly mandrel structure for a hot rolling mill according to claim 3, characterized in that, The total width of each annular groove (122) is L1, and the length of the conical segment (121) is L2, where L1∶L2=1∶(1.5-3).

5. The high-efficiency disassembly mandrel structure for a hot rolling mill according to claim 1, characterized in that, A transition section (13) is provided between the tapered section (121) and the main shaft section (11).

6. The high-efficiency disassembly mandrel structure for a hot rolling mill according to claim 5, characterized in that, A straight connecting section (14) is provided between the transition section (13) and the tapered section (121), and the length of the straight connecting section (14) is 5mm.

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