JP2006212683A - Method of joining metallic ring-like material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method capable of firmly joining a large diameter ring-like material with a small diameter ring-like material by the form rolling utilizing a rolling mill. <P>SOLUTION: A metallic small diameter ring-like material 2 is arranged inside a metallic large diameter ring-like material 1, a mandrel 11 is inserted inside the small diameter ring-like material, and the large diameter ring-like material and the small diameter ring-like material are pressed, held and form-rolled by a rolling mill 3 to join the large diameter ring-like material with the small diameter ring-like material. The large diameter ring-like material and the small diameter ring-like material are formed of dissimilar metals. Irregularities 1a, 2a are formed on an inner circumferential surface of the large diameter ring-like material and/or an outer circumferential surface of the small diameter ring-like material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for joining metal ring-shaped materials by rolling using a rolling mill.

  Conventionally, "shrink fit", "cool fit", "diffusion joint", "adhesive" have been used as a means of fitting a large diameter ring material made of different metals to the outer periphery of a small diameter ring material and joining them together. And the like "are known.

Patent Document 1 below discloses a method of manufacturing a ring-shaped product by cold rolling by loading a ring-shaped material into a rolling mill consisting of a forming roll, a receiving roll, and a mandrel (mandrel). Document 2 discloses a method of forming a ring-shaped product such as a bearing race by cold rolling a ring-shaped material made of difficult-to-process special steel without generating cracks. A method of sizing a ring-shaped material by punching is disclosed.
JP-A-3-268833 Japanese Patent Laid-Open No. 2001-9552 JP 2003-1365 A

By the way, among the above conventional ring-shaped material joining means, “shrink fit”, “cool fit” or “joining with an adhesive” has a problem that sufficient joining strength cannot be obtained. "Could not be joined depending on the metal material. Further, these joining means have a problem that the strength of the base material is reduced by heating.
Therefore, the present invention intends to provide a method capable of firmly joining a ring-shaped material by rolling using a rolling mill.

  Therefore, the metal ring-shaped material joining method according to claim 1 is arranged such that a metal small-diameter ring-shaped material is disposed inside a metal large-diameter ring-shaped material, and a mandrel is disposed inside the small-diameter ring-shaped material. The large-diameter ring-shaped material and the small-diameter ring-shaped material are joined to each other by being inserted and pressed by a rolling mill and rolled.

The invention of claim 2 is characterized in that, in the above-mentioned joining method, the large-diameter ring-shaped material and the small-diameter ring-shaped material are made of different metals.
The invention of claim 3 is characterized in that, in the above-mentioned joining method, irregularities are formed on the inner peripheral surface of the large-diameter ring-shaped material and / or the outer peripheral surface of the small-diameter ring-shaped material.

  A large-diameter ring-shaped material and a small-diameter ring-shaped material can be firmly joined by rolling. Further, the time and cost required for joining are reduced, and strong joining is possible even if the large-diameter ring-shaped material and the small-diameter ring-shaped material are dissimilar metals.

  Next, embodiments of the present invention will be described with reference to the drawings. The large-diameter ring-shaped material 1 shown in FIG. 1 is made of, for example, hard bearing steel (SUJ2), and the small-diameter ring-shaped material 2 is made of a tough gunmetal (copper / tin alloy). The difference between the inner diameter “a” of the large-diameter ring-shaped material 1 and the outer diameter “b” of the small-diameter ring-shaped material 2 is set to about 3 to 5 mm so that the small-diameter ring-shaped material 2 can be loosely fitted into the first. On the other hand, FIG. 2 and FIG. 3 show the outline of the rolling mill used for this rolling. In this rolling mill 3, a pair of receiving rolls 6, 6 are provided at an appropriate interval on a rotating shaft 5 of a motor 4, and a housing 8 is provided so that the cylinder 7 can move forward and backward in a direction perpendicular to the rotating shaft 5. A molding roll 10 that is rotated by a motor 9 is provided in the housing. Reference numeral 11 denotes a mandrel provided so as to move back and forth between the receiving rolls 6 and 6 and the forming roll 10 by operating the cylinder 12. Reference numeral 13 denotes a moving arm that is suspended from above, and a grip 14 is provided at the lower end of the moving arm.

  Then, with the small-diameter ring-shaped material 2 loosely fitted in the large-diameter ring-shaped material 1, the materials 1 and 2 are gripped by the grip 14, and the materials 1 and 2 are carried between the receiving rolls 6 and 6. In this state, the mandrel 11 is inserted into the materials 1 and 2 by operating the cylinder 12 and advancing the mandrel 11. Then, the cylinder 7 is operated to press the molding roll 10 against the outer peripheral surface of the material 1, and the mandrel 11 is supported by the receiving rolls 6 and 6, so that the materials 1 and 2 are sandwiched between the mandrel 11 and the molding roll 10. Then, the receiving rolls 6 and 6 and the forming roll 10 are rotated by the motors 4 and 9. As a result, the materials 1 and 2 are pressed and clamped by the mandrel 11 and the forming roll 10, and the small-diameter ring-shaped material 2 is integrally joined to the inner peripheral surface of the large-diameter ring-shaped material 1 as shown in FIG. Then, the ring-shaped product 15 having a desired size can be rolled. In addition, the time required for this rolling is a dozen seconds. In this case, the diameter of the small-diameter ring-shaped material 2 is expanded by rolling, and the diameter of the large-diameter ring-shaped material 1 is also expanded. However, only the small-diameter ring-shaped material 2 made of gun metal having high toughness may be expanded. Further, as shown in the cross-sectional view of the ring-shaped product in FIG. 5, the concave / convex portion 1 a is formed in advance on the inner peripheral surface of the large-diameter ring-shaped material 1, such as by forming a groove in advance. Since the ring-shaped material 2 can be extended and brought into close contact, the integral joint strength between the large-diameter ring-shaped material 1 and the small-diameter ring-shaped material 2 can be made stronger.

In addition, by forming a predetermined circumferential groove or the like on the outer peripheral surface of the forming roll 10 in advance, the outer peripheral surface of the large-diameter ring-shaped material 1 can be shaped following this shape. For this reason, ring-shaped functional parts, such as a pulley, can be shape | molded by this. In the above case, the inner gun metal functions as a bearing bush metal (dry metal).
Further, by providing a similar shape on the outer peripheral surface of the mandrel 11, it can be similarly shaped on the inner peripheral surface of the small-diameter ring-shaped material 2. For this reason, according to this rolling, the large-diameter ring-shaped material 1 and the small-diameter ring-shaped material 2 can be joined, and at the same time, ring-shaped products of various shapes can be formed in a short time, greatly increasing productivity and yield. Improve.

  Also, for example, a lightweight gear can be commercialized by joining the large-diameter ring-shaped material 1 made of carbon steel for mechanical structure (S45C) and the small-diameter ring-shaped material 2 made of duralumin by the above rolling, or a large-sized steel made of stainless steel. A corrosion-resistant pipe joint can be commercialized by joining the diameter ring-shaped material 1 and the small diameter ring-shaped material 2 made of a titanium alloy by the above rolling. As described above, the material of the large-diameter ring-shaped material 1 and the small-diameter ring-shaped material 2 can be various combinations depending on the application in addition to the above-described embodiments, and various dissimilar metals can be easily joined by rolling. it can. In addition, as shown in FIG. 6, it is possible to further improve the bonding strength by forming the unevenness 2 a on the outer periphery of the small-diameter ring-shaped material 2. Moreover, it is possible to perform rolling in an appropriate environment such as cold, warm, hot, etc. according to the material and application.

The perspective view of the large diameter ring-shaped material and small diameter ring-shaped material which concern on this invention. The front view which shows the outline of the rolling mill which concerns on this invention. The top view which shows the outline of the rolling mill which concerns on this invention. The operation state figure of FIG. The longitudinal cross-sectional view of the ring-shaped product of FIG. The longitudinal cross-sectional view of the ring-shaped product rolled by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Large diameter ring-shaped material 2 Small diameter ring-shaped material 3 Rolling mill 6 Receiving roll 10 Forming roll 11 Mandrel 1a, 2a Concavity and convexity 15 Ring-shaped product

Claims (3)

  A metal small-diameter ring material is placed inside the metal large-diameter ring material, and a mandrel is inserted inside the small-diameter ring material so that the large-diameter ring material and the small-diameter ring material are rolled. A method for joining a metal ring-shaped material, characterized in that the large-diameter ring-shaped material and the small-diameter ring-shaped material are joined by pressing and rolling with a roller.   The method for joining metal ring-shaped materials according to claim 1, wherein the large-diameter ring-shaped material and the small-diameter ring-shaped material are made of different metals.   The method for joining metal ring-shaped materials according to claim 1 or 2, wherein irregularities are formed on the inner peripheral surface of the large-diameter ring-shaped material and / or the outer peripheral surface of the small-diameter ring-shaped material.

Images