Core roller structure of vertical ring rolling machine

Abstract

The utility model relates to the technical field of forging dies, in particular to a vertical ring rolling machine core roller structure which comprises a supporting core roller, a core roller sleeve is sleeved on the supporting core roller, a lubricating layer is arranged between the supporting core roller and the core roller sleeve, and the lubricating layer is a structural part made of lubricating materials. The core roller structure of the vertical ring rolling machine is improved, a core roller of a single structure is replaced by the composite core roller structure, the core roller structure considers complex stress and heating alternating load of rolling forming of aerospace high-performance annular forgings on the core roller, the thermal fatigue cracking phenomenon of the surface layer area of the core roller is also considered, and the layered structure is adopted; inward extension of thermal fatigue cracking of the surface layer of the core roller is effectively restrained, so that the service life of the core roller die is prolonged, the annular forging manufacturing period is ensured, and the annular forging manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of forging dies, in particular to a core roller structure of a vertical ring rolling machine. Background Art

[0002] High-performance ring forgings in aerospace are often rolled and formed using vertical ring rolling machines. However, high-performance ring forgings in aerospace are basically made of difficult-to-form materials such as titanium alloys and high-temperature alloys. The forging materials have high deformation resistance and high forming temperatures. The core rollers used for rolling and forming high-performance ring forgings in aerospace are often in extreme working conditions. On the one hand, they need to withstand extremely large cyclic loads such as bending, shearing, and impact, and on the other hand, they need to receive heat conduction from hot forgings. Under such complex alternating forces and heat, the core rollers are very prone to fatigue fracture failure. According to statistics, the average life of the cylindrical core rollers made of 5CrNiMo, which are commonly used, is 13 pieces, which seriously affects the manufacturing rhythm of ring forgings and increases the manufacturing cost of ring forgings.

[0003] Therefore, a technical solution is currently needed to solve the technical problem that when a vertical ring rolling machine is used for hole expansion rolling, the core roller is prone to fatigue fracture failure under the complex alternating effects of force and heat, which affects the manufacturing efficiency of ring forgings and increases production costs. Utility Model Content

[0004] The invention purpose of the utility model is to provide a vertical ring rolling machine core roller structure to solve the technical problem that when a vertical ring rolling machine is used for hole expansion rolling, the core roller is prone to fatigue fracture failure under the complex alternating effects of force and heat, which affects the manufacturing efficiency of the ring forgings and increases the production cost.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A core roller structure of a vertical ring rolling machine comprises a supporting core roller, a core roller sleeve is sleeved on the supporting core roller, a lubricating layer is arranged between the supporting core roller and the core roller sleeve, and the lubricating layer is a lubricating material structural member.

[0007] The utility model discloses a core roller structure of a vertical ring rolling machine. When in use, the annular forging contacts with a core roller sleeve mounted on a supporting core roller, thereby preventing the supporting core roller from being directly heated. At the same time, since a lubricating layer is arranged between the supporting core roller and the core roller sleeve, when the annular forging drives the core roller sleeve and the supporting core roller to rotate, the lubricating layer plays a lubricating role between the supporting core roller and the core roller sleeve, thereby reducing the wear of the core roller sleeve and the supporting core roller respectively. After long-term use, if the core roller sleeve has thermal fatigue cracking or other damage, it can be directly replaced, thereby reducing the maintenance cost of the core roller structure.

[0008] As a preferred solution of the utility model, the length of the core roller sleeve is adapted to the height of the annular forging to be processed. A core roller sleeve that is adapted to the height of the annular forging to be processed is sleeved on the supporting core roller, and the core roller sleeve on the supporting core roller is limited by the structure on the equipment, which can save the overall material of the core roller sleeve and reduce the production cost and replacement cost of the core roller sleeve.

[0009] As a preferred solution of the utility model, the length of the core roller sleeve is adapted to the length of the supporting core roller, and the core roller sleeve covers the supporting core roller along the length direction of the supporting core roller. The core roller sleeve completely covers the supporting core roller, so that the core roller structure can adapt to the processing of annular forgings of different heights, and the core roller sleeve is more firmly installed on the supporting core roller, and there is no need to limit the core roller sleeve separately.

[0010] As a preferred solution of the utility model, the thickness of the core roller sleeve is d, 3mm≤d≤10mm. The thickness of the core roller sleeve is set to be above 3mm to ensure that the core roller sleeve has sufficient heat insulation performance, can protect and support the core roller, and has a long service life. The thickness of the core roller sleeve is set to be below 10mm to control the production cost of the core roller sleeve.

[0011] As a preferred solution of the utility model, the core roller sleeve is a structural member made of 42CrMo material. 42CrMo is an alloy structural steel with good mechanical properties and machinability, which can reduce the manufacturing cost of the core roller sleeve.

[0012] As a preferred solution of the utility model, the supporting core roller is a structural member made of 5CrNiMo material. 5CrNiMo has good toughness, strength, wear resistance and high temperature resistance, and can reduce the replacement frequency of the supporting core roller.

[0013] As a preferred solution of the utility model, the lubricating layer is a MoS2 material structure. MoS2 is an important solid lubricant, which is particularly suitable for lubricating the core roller sleeve and the supporting core roller under high temperature and high pressure.

[0014] As a preferred solution of the utility model, the lubricating layer is a graphite structure. Graphite has a melting point of up to 3850°C, a low thermal expansion coefficient, and its own strength increases with increasing temperature, which can provide good lubrication for the core roller sleeve and the core roller during the rolling process.

[0015] As a preferred solution of the utility model, the lubricating layer is a structure of a mixed material of MoS2 and graphite.

[0016] As a preferred solution of the utility model, the thickness of the lubricating layer is c, 0.15mm≤c≤0.25mm. The thickness of the lubricating layer is set to be above 0.15mm to ensure that the lubricating layer has a good lubricating effect on the core roller sleeve and the supporting core roller, and at the same time can reduce the difficulty of installing the core roller sleeve on the supporting core roller. The thickness of the lubricating layer is set to be below 0.25mm to ensure that the core roller sleeve is firmly mounted on the supporting core roller.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0018] The utility model improves the core roller structure of the vertical ring rolling machine and replaces the single-structure core roller with a composite core roller structure. The core roller structure takes into account the complex force and thermal alternating loads on the core roller during the rolling and forming of high-performance aerospace ring forgings, as well as the thermal fatigue cracking phenomenon of the core roller surface area, and adopts a layered structure to effectively suppress the inward extension of thermal fatigue cracking of the core roller surface, thereby increasing the service life of the core roller mold, ensuring the ring forging manufacturing cycle, and reducing the manufacturing cost of the ring forgings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic axial cross-sectional view of a core roller structure of a vertical ring rolling machine of the utility model in Example 1;

[0020] Figure 2 It is a radial cross-sectional schematic diagram of a core roller structure of a vertical ring rolling machine of the utility model in Example 1;

[0021] Figure 3 It is a schematic axial cross-sectional view of a core roller structure of a vertical ring rolling machine of the utility model in Example 2;

[0022] Markings in the figure: 1-support core roller, 2-core roller sleeve, 3-lubricating layer. DETAILED DESCRIPTION

[0023] The utility model is described in detail below in conjunction with the accompanying drawings.

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] Example 1

[0026] like Figure 1 and Figure 2As shown, the present embodiment is a core roller structure of a vertical ring rolling machine, including a supporting core roller 1, on which a core roller sleeve 2 is sleeved, the length of the core roller sleeve 2 is adapted to the height of the ring forging to be processed (that is, the length of the core roller sleeve 2 is the same as the height of the ring forging), the core roller sleeve 2 on the supporting core roller 1 is limited by the structure on the equipment, and a lubricating layer 3 is provided between the supporting core roller 1 and the core roller sleeve 2, and the lubricating layer 3 is a structural member made of a lubricating material.

[0027] When in use, the annular forging contacts with the core roller sleeve 2 mounted on the supporting core roller 1, thereby preventing the supporting core roller 1 from being directly heated; at the same time, since a lubricating layer 3 is provided between the supporting core roller 1 and the core roller sleeve 2, when the annular forging drives the core roller sleeve 2 and the supporting core roller 1 to rotate, the lubricating layer 3 lubricates the supporting core roller 1 and the core roller sleeve 2, thereby reducing the wear of the core roller sleeve 2 and the supporting core roller 1; and after long-term use, if the core roller sleeve 2 suffers from thermal fatigue cracking or other damage, it can be directly replaced, thereby reducing the maintenance cost of the core roller structure.

[0028] Specific:

[0029] 1) Support core roller 1

[0030] a) Material: 5CrNiMo;

[0031] b) There shall be no tool marks on the surface of the supporting core roller 1, and the surface roughness shall not be less than Ra6.3;

[0032] c) The supporting core roller 1 is a forging, and the forging ratio is not less than 5;

[0033] d) The heat treatment state of the supporting core roller 1 is: quenching + low temperature tempering, controlled at HRC42-47;

[0034] e) After rough machining, the support core roller 1 shall be inspected according to HB 20159-2014, using the contact method, and accepted at Class A;

[0035] f) The dimensional tolerance shall be controlled according to GB / T 1804 m (medium grade), and the geometric tolerance shall be controlled according to GB / T 1184 K grade.

[0036] 2) Core roller sleeve 2

[0037] a) The core roller sleeve 2 and the supporting core roller 1 are clearance matched, and the single-side clearance is controlled at 0.15mm to 0.25mm;

[0038] b) The wall thickness of the core roller sleeve 2 is 3mm to 10mm, and the wall thickness tolerance is ±0.1mm;

[0039] c) The surface roughness of the inner and outer diameters of the core roller sleeve 2 shall not be less than Ra6.3;

[0040] d) The axial length of the core roller sleeve 2 is designed to be 250mm to 400mm;

[0041] e) The core roller sleeve 2 is made of 42CrMo;

[0042] f) The core roller sleeve 2 is a forging, and the forging ratio is not less than 5;

[0043] g) The heat treatment state of the core roller sleeve 2 is: quenching + low temperature tempering, controlled at HRC48~52;

[0044] h) The core roller sleeve 2 is installed on the supporting core roller 1, and a lubricating layer 3 is filled between the core roller sleeve 2 and the supporting core roller 1.

[0045] 3) Lubricating layer 3

[0046] a) The lubricating layer 3 is made of MoS2, graphite or a mixture of MoS2 and graphite; the thickness is controlled at 0.15 mm to 0.25 mm, and the particle size is controlled at 325 mesh to 2500 mesh.

[0047] Example 2

[0048] like Figure 3 As shown, in this embodiment, the difference from Embodiment 1 is that the length of the core roller sleeve 2 is adapted to the length of the supporting core roller 1 , and the core roller sleeve 2 covers the supporting core roller 1 along the length direction of the supporting core roller 1 .

[0049] In this embodiment, the core roller sleeve 2 completely covers the supporting core roller 1, so that the core roller structure can adapt to the processing of annular forgings of different heights, and the core roller sleeve 2 is installed more firmly on the supporting core roller 1, and there is no need to limit the core roller sleeve 2 separately.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vertical ring rolling machine core roller structure, characterized in that: It comprises a supporting core roller (1), wherein a core roller sleeve (2) is sleeved on the supporting core roller (1), a lubricating layer (3) is provided between the supporting core roller (1) and the core roller sleeve (2), and the lubricating layer (3) is a structural part made of a lubricating material.

2. The core roller structure of the vertical ring rolling machine according to claim 1 is characterized in that: The length of the core roller sleeve (2) is adapted to the height of the annular forging to be processed.

3. The core roller structure of the vertical ring rolling machine according to claim 1 is characterized in that: The length of the core roller sleeve (2) is adapted to the length of the supporting core roller (1), and the core roller sleeve (2) covers the supporting core roller (1) along the length direction of the supporting core roller (1).

4. The core roller structure of the vertical ring rolling machine according to claim 1 is characterized in that: The thickness of the core roller sleeve (2) is d, 3mm≤d≤10mm.

5. The core roller structure of the vertical ring rolling machine according to claim 1 is characterized in that: The core roller sleeve (2) is a structural component made of 42CrMo material.

6. The core roller structure of the vertical ring rolling machine according to claim 1 is characterized in that: The supporting core roller (1) is a structural component made of 5CrNiMo material.

7. The core roller structure of the vertical ring rolling machine according to claim 1 is characterized in that: The lubricating layer (3) is a structural component made of MoS2 material.

8. The core roller structure of the vertical ring rolling machine according to claim 1 is characterized in that: The lubricating layer (3) is a graphite structural component.

9. The core roller structure of the vertical ring rolling machine according to claim 1 is characterized in that: The lubricating layer (3) is a structure made of a mixed material of MoS2 and graphite.

10. The core roller structure of the vertical ring rolling machine according to claim 1 is characterized in that: The thickness of the lubricating layer (3) is c, 0.15 mm ≤ c ≤ 0.25 mm.

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