Manufacturing method for metal rings

Abstract

To provide a metal ring manufacturing method by which a metal ring of a large-diameter and long multi-layered structure can be obtained.SOLUTION: A metal ring manufacturing method comprises a process in which a second ring of aluminum or aluminum alloy is fitted into a first ring of aluminum or aluminum alloy, and a process in which a combined ring, in which the second ring is fitted into the first ring, is forged. In the forging process, a process, in which a part of the combined ring in a circumferential direction is compressed in a thickness direction by a compression apparatus, and a process, in which the combined ring is moved in the circumferential direction of the same relatively to the compression apparatus after the compressing process, are alternately repeated.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a method for manufacturing a metal ring and a metal ring. [Background technology]

[0002] A technique is known in which two metal rings are fitted together, and then the outer circumferential surface of the inner metal ring is tightly attached to the inner circumferential surface of the outer metal ring by ring rolling (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-1461 A Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned pressure welding method using ring rolling has a limit to the area to which pressure can be applied due to the structure of the equipment, and therefore it is not possible to manufacture a large-diameter, long, multi-layered metal ring.

[0005] An object of one aspect of the present disclosure is to provide a method for manufacturing a metal ring, which can produce a large-diameter, long metal ring having a multi-layer structure. [Means for solving the problem]

[0006] One aspect of the present disclosure is a method for manufacturing a metal ring, comprising the steps of fitting a second ring made of aluminum or an aluminum alloy inside a first ring made of aluminum or an aluminum alloy, and forging a combined ring in which the second ring is fitted into the first ring. In the forging step, a step of compressing a part of the combined ring in the circumferential direction in the thickness direction by a compression device and a step of moving the combined ring relatively in the circumferential direction of the combined ring with respect to the compression device after the compression step are alternately repeated.

[0007] According to this configuration, by repeating the steps of partially compressing the combined ring and then changing the portion to be compressed, it is possible to forge a combined ring having a large diameter and a long length, thereby obtaining a metal ring having a large diameter and a long length with a multi-layer structure. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1A is a schematic perspective view of a metal ring in this embodiment, and FIG. 1B is a schematic plan view of the metal ring of FIG. 1A. [Diagram 2] FIG. 2 shows a flow of a method for manufacturing a metal ring in this embodiment. [Diagram 3] FIG. 3 is a schematic diagram showing a procedure of a fitting step in the manufacturing method of the metal ring of FIG. [Figure 4] 4A is a schematic side view of a compression device used in a forging step in the manufacturing method of the metal ring of FIG. 2, and FIG. 4B is a schematic front view of the compression device of FIG. 4A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings. [1. First embodiment] [1-1. Configuration] <Metal Ring 100> The metal ring 100 shown in FIGS. 1A and 1B is a clad material having multiple metal layers with different compositions.

[0010] Specifically, the metal ring 100 includes a first layer 101, a second layer 102, and a third layer 103. The first layer 101 constitutes the outermost layer of the metal ring 100. The second layer 102 is disposed on the inner side of the first layer 101. The third layer 103 is disposed on the inner side of the second layer 102.

[0011] The first layer 101, the second layer 102, and the third layer 103 are each made of aluminum or an aluminum alloy. An example of a composition combination of the first layer 101, the second layer 102, and the third layer 103 is a combination of the first layer 101 made of A5052, the second layer 102 made of A7050, and the third layer 103 made of A6061, which is a standard combination conforming to JIS-H-4000.

[0012] The dimensions of the metal ring 100 are either in the following first or second range. The first range is an outer diameter R of 300 mm or more and 3000 mm or less, and a length L of 200 mm or more and 1500 mm or less. The second range is an outer diameter R of 300 mm or more and 1000 mm or less, and a length L of 200 mm or more and 3000 mm or less.

[0013] <Metal Ring Manufacturing Method> The manufacturing method of the metal ring shown in Fig. 2 includes a fitting step S10 and a forging step S20. The manufacturing method of the metal ring provides the metal ring 100 shown in Fig. 1A.

[0014] <Fitting process> 3, in this step, the second ring 202 is fitted inside the first ring 201. In addition, the third ring 203 is fitted inside the second ring 202.

[0015] The first ring 201, the second ring 202, and the third ring 203 respectively form the first layer 101, the second layer 102, and the third layer 103 of the metal ring 100. That is, the first ring 201, the second ring 202, and the third ring 203 are made of aluminum or an aluminum alloy.

[0016] The first ring 201 is thicker than the first layer 101. The second ring 202 is thicker than the second layer 102. The third ring 203 is thicker than the third layer 103.

[0017] As a specific procedure, first, the second ring 202 at room temperature is inserted inside the thermally expanded first ring 201, and the first ring 201 is cooled, thereby shrink-fitting the second ring 202 onto the first ring 201.

[0018] Next, the third ring 203 at room temperature is inserted inside the thermally expanded first ring 201 and second ring 202, and the first ring 201 and second ring 202 are cooled, thereby shrink-fitting the third ring 203 onto the second ring 202.

[0019] The heating temperature of each ring during shrink fitting is, for example, not less than 300° C. and not more than 450° C. By shrink fitting the second ring 202 and the third ring 203, a combined ring 210 (see FIG. 4B) in which the first ring 201, the second ring 202, and the third ring 203 are integrated is obtained.

[0020] <Forging process> In this step, a combined ring 210 is forged in which the second ring 202 is fitted into the first ring 201 and the third ring 203 is fitted into the second ring 202. This step includes a compression step S21 and a moving step S22.

[0021] <Compression process> 4A, in this step, a circumferential portion of the combined ring 210 is compressed in the thickness direction by a compression device 300. The compression device 300 has a core material 301, a support portion 302, and a press portion 303.

[0022] The core material 301 is a cylindrical member that is inserted into the hollow portion of the combined ring 210 in the axial direction of the combined ring 210. The length of the core material 301 is greater than the length of the combined ring 210. The core material 301 supports the combined ring 210 by contacting the inner circumferential surface of the combined ring 210 from below.

[0023] The support portion 302 supports the core material 301 from below. The support portion 302 does not directly support the combining ring 210.

[0024] The pressing part 303 is configured to be movable in the up and down direction. The pressing part 303 presses the combined ring 210 from the radial outside (specifically, from above) of the combined ring 210 toward the core material 301 (specifically, downward).

[0025] In the combined ring 210, the portion pressed by the press portion 303 and the core material 301 is compressed in the thickness direction. As a result, the thickness of this portion is reduced, and the inner peripheral surface of the first ring 201 and the outer peripheral surface of the second ring 202, and the inner peripheral surface of the second ring 202 and the outer peripheral surface of the third ring 203 are pressed against each other.

[0026] <Moving process> In this process, after the compression step S21, the combining ring 210 is moved relatively to the compression device 300 in the circumferential direction of the combining ring 210.

[0027] Specifically, with the pressing force from the press portion 303 released, the combining ring 210 is rotated in the circumferential direction until the next part to be compressed is on the upper side (i.e., until it reaches a position facing the press portion 303).

[0028] In addition, the combined ring 210 may be rotated while the core material 301 is inserted into the combined ring 210, or the combined ring 210 may be rotated after the core material 301 is removed from the combined ring 210, and then the core material 301 may be reinserted into the combined ring 210.

[0029] In the forging step S20, the compression step S21 and the moving step S22 are alternately repeated until the thickness of the entire circumference of the combined ring 210 reaches a target thickness. That is, compression is performed multiple times on the same region of the combined ring 210. The ratio of the thickness of the combined ring 210 after the forging step S20 to the thickness of the combined ring 210 before the forging step S20 (i.e., the compression rate) is, for example, not less than 10% and not more than 50%.

[0030] By repeating the compression step S21, the inner diameter of the combined ring 210 gradually increases. Therefore, depending on the inner diameter of the combined ring 210 (that is, the number of presses), the core material 301 may be replaced with one having a different outer diameter.

[0031] [1-2. Effects] According to the embodiment described above in detail, the following effects can be obtained. (1a) By repeating the steps of partially compressing the combined ring 210 and then changing the portion to be compressed, it is possible to perform forging on the large-diameter and long combined ring 210. As a result, the large-diameter and long metal ring 100 having a multi-layer structure can be obtained.

[0032] (1b) By fitting the second ring 202 into the first ring 201 by shrink fitting, the number of steps required to obtain the combined ring 210 can be reduced.

[0033] (1c) By rotating the combining ring 210 in the moving step S22, workability is improved compared to the case where the compression device 300 (that is, the core material 301 and the press unit 303) is moved.

[0034] (1d) By using the compression device 300 having the core material 301 and the press section 303, it is possible to manufacture a large-diameter, long metal ring 100 using existing equipment.

[0035] 2. Other embodiments Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take various forms.

[0036] (2a) In the manufacturing method of the metal ring of the above embodiment, the metal ring 100 may have a two-layer structure. That is, the metal ring 100 may have only the first layer 101 and the second layer 102. The metal ring 100 may also have a structure of four or more layers. That is, the metal ring 100 may have an additional layer inside the third layer 103.

[0037] (2b) In the manufacturing method of the metal ring of the above embodiment, in the fitting step, cold fitting may be used instead of shrink fitting. For example, the second ring 202 that has shrunk due to cooling may be inserted inside the first ring 201 at room temperature, and the second ring 202 may be heated to fit the second ring 202 into the first ring 201.

[0038] (2c) In the manufacturing method of the metal ring of the above embodiment, in the moving step, instead of rotating the combined ring 210, a part of the compression device 300 (for example, the core material 301) may be moved relative to the combined ring 210.

[0039] (2d) The function of one component in the above embodiments may be distributed among multiple components, or the functions of multiple components may be integrated into one component. In addition, a part of the configuration of the above embodiments may be omitted. In addition, at least a part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. Note that all aspects included in the technical idea identified from the wording of the claims are embodiments of the present disclosure. [Explanation of symbols]

[0040] 100...metal ring, 101...first layer, 102...second layer, 103...third layer, 201...first ring, 202...second ring, 203...third ring, 210: Combination ring; 300: Compression device; 301: Core material; 302: Support portion; 303...Press Department.

Claims

1. A step of fitting a second ring made of aluminum or an aluminum alloy inside a first ring made of aluminum or an aluminum alloy, and fitting a third ring made of aluminum or an aluminum alloy inside the second ring, A process of forging a combined ring in which the second ring is fitted into the first ring and the third ring is fitted into the second ring, Equipped with, A method for manufacturing a metal ring, comprising the steps of: compressing a portion of the circumferential direction of the combined ring in the thickness direction using a compression device; and, after the compression step, moving the combined ring relative to the compression device in the circumferential direction of the combined ring, repeating these steps alternately.

2. A method for manufacturing a metal ring according to claim 1, A method for manufacturing metal rings, comprising the fitting step of inserting the second ring inside the first ring which has been thermally expanded, cooling the first ring, inserting the third ring inside the first and second rings which have been thermally expanded, and cooling the first and second rings.

3. A step of fitting a second ring made of aluminum or an aluminum alloy inside a first ring made of aluminum or an aluminum alloy, The process of forging a combined ring in which the second ring is fitted into the first ring, Equipped with, In the forging process, the steps of compressing a portion of the circumferential direction of the combined ring in the thickness direction using a compression device, and the steps of moving the combined ring relative to the compression device in the circumferential direction after the compression process are repeated alternately. The compression device is A core material inserted into the aforementioned combined ring, It has a press section that presses the combined ring toward the core material from the radially outer side of the combined ring, A method for manufacturing a metal ring, wherein in the forging process, the core material is replaced with one of a different outer diameter according to the gradually increasing inner diameter of the combined ring.

4. A method for manufacturing a metal ring according to claim 1, A method for manufacturing a metal ring, wherein the moving step involves rotating the combined ring in the circumferential direction.

5. A method for manufacturing a metal ring according to any one of claims 1 to 3, The compression device is A core material inserted into the aforementioned combined ring, A pressing section that presses the combined ring toward the core material from the radially outer side of the combined ring, A method for manufacturing a metal ring, comprising the characteristics of a metal ring.

6. A method for manufacturing a metal ring according to any one of claims 1 to 4, A method for manufacturing a metal ring, wherein the forging process yields a metal ring having an outer diameter of 300 mm or more and 3000 mm or less and a length of 200 mm or more and 1500 mm or less, or an outer diameter of 300 mm or more and 1000 mm or less and a length of 200 mm or more and 3000 mm or less.

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