JP3206922U - Ring roll forming machine - Google Patents

Abstract

A ring roll forming machine capable of improving wear resistance at a lower cost and easily. A forming roll 11 is disposed on an outer peripheral side of an annular workpiece W, and a mandrel 12 is disposed on an inner peripheral side of the annular workpiece W, so that a part of the annular workpiece W is clamped. On the outer peripheral side of the annular workpiece W, a pair of axial rolls 13 are arranged so as to be sandwiched in a direction perpendicular to the radial direction, and a measurement roll 14 is arranged therebetween. Further, centering rolls 15 are arranged on both sides of the forming roll 11. At least one of the mandrel 12, the axial roll 13, the measurement roll 14, and the centering roll 15 is made of a steel material whose surface is hardened by induction hardening at least at a portion in contact with the annular workpiece W. . [Selection] Figure 1

Description

  The present invention relates to a ring roll forming machine for manufacturing a ring roll product by a ring roll method.

  The ring roll method is to rotate a work piece while pressing a part of the work ring with a mandrel located on the inner circumference side and a forming roll located on the outer circumference side against an annular work piece. It is formed into a thin and large-diameter product (see, for example, Patent Document 1). According to this ring roll method, the material yield at the time of manufacture can be improved, a grooved product can be easily manufactured, and the thickness variation can be extremely reduced.

  As a ring roll forming machine used in this ring roll method, for example, a forming roll is disposed on the outer peripheral side of the annular workpiece, a mandrel is disposed on the inner peripheral side, and rolling in the thickness direction is performed. As for the vertical direction, one in which rolling is performed between a pair of axial rolls is known. In addition, a centering roll for holding a perfect circle and a measurement roll for measuring the outer diameter of the annular workpiece are arranged on the outer peripheral side of the annular workpiece. Among these, for mandrels, axial rolls, centering rolls, and measuring rolls, for example, chrome molybdenum steel (SCM), nickel chrome molybdenum steel (SNCM), or SKD61 (JIS standard) is prepared. The material is used.

Japanese Patent Laying-Open No. 2015-24420

  However, these tempered hardnesses are about HRC38 for chrome molybdenum steel and nickel chrome molybdenum steel, and about HRC53 for die steel. Therefore, in order to improve the wear resistance and extend the service life, build-up welding of high-hardness material or plasma powder build-up welding is performed on the surface, but the price increases, and the production lead There was a problem that the time also became long.

  The present invention has been made based on such a problem, and an object of the present invention is to provide a ring roll forming machine capable of improving wear resistance at a lower cost and easily.

  The ring roll forming machine of the present invention is to manufacture a ring roll product by expanding the diameter of an annular work while thinning the ring, and is a forming roll that is arranged on the outer peripheral side of the annular work and forms an outer diameter shape. And a mandrel that is arranged on the inner peripheral side of the annular workpiece and forms an inner diameter shape, and is arranged so as to sandwich the annular workpiece in a direction perpendicular to the radial direction, and rolling in a direction perpendicular to the radial direction is performed. A pair of axial rolls to be performed and arranged on the outer peripheral side of the annular work, and while rotating the annular work smoothly, a centering roll for holding a perfect circle and an outer peripheral side of the annular work, A measuring roll for measuring the outer diameter of the annular workpiece, and at least one of a mandrel, an axial roll, a centering roll, and a measuring roll is at least annular Portion in contact with over click is made of steel material obtained by curing the surface by induction hardening.

  According to the present invention, at least one of the mandrel, the axial roll, the centering roll, and the measuring roll is hardened by induction hardening at least at the portion that contacts the annular workpiece, so that it is inexpensive and simple. In addition, the wear resistance can be improved.

It is a figure showing the structure of the principal part of the ring roll molding machine which concerns on one embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a configuration of a main part of a ring roll forming machine 10 according to an embodiment of the present invention. This ring roll molding machine 10 includes a part of the annular workpiece W between a molding roll 11 disposed on the outer circumferential side of the annular workpiece W and a mandrel 12 disposed on the inner circumferential side of the annular workpiece W. A ring roll product is manufactured by a ring roll construction method for sandwiching and pressing.

  The forming roll 11 is for forming an outer diameter shape, and the mandrel 12 is for forming an inner diameter shape. The forming roll 11 and the mandrel 12 are disposed so that the mandrel 12 and the annular workpiece W rotate along with the rotation of the forming roll 11, and the forming roll 11 has a larger diameter than the mandrel 12. In the ring roll molding machine 10, for example, the outer peripheral surface of the annular workpiece W is pressed against the outer peripheral surface of the molding roll 11, and the outer peripheral surface of the mandrel 12 is pressed against the inner peripheral surface of the annular workpiece W to rotate them. The molding roll 11 and the mandrel 12 are configured to move in a relatively approaching manner. As a result, the annular workpiece W sandwiched between the forming roll 11 and the mandrel 12 is expanded in diameter while being thinned. The outer peripheral surface shape of the forming roll 11 is formed corresponding to the outer peripheral surface and the width surface shape of the ring roll product to be manufactured, and the outer peripheral surface shape of the mandrel 12 corresponds to the inner peripheral surface shape of the ring roll product to be manufactured. Is formed.

  The ring roll forming machine 10 is also provided with a pair of axial rolls 13 that are arranged so as to sandwich the annular workpiece W in a direction perpendicular to the radial direction and perform rolling in the direction perpendicular to the radial direction. For example, the pair of axial rolls 13 is disposed on the opposite side of the forming roll 11 and has a conical shape or a truncated cone shape. Between the pair of axial rolls 13, for example, a measurement roll 14 is disposed on the outer peripheral side of the annular workpiece W. The measuring roll 14 comes into contact with the annular workpiece W during rolling and measures the outer diameter of the annular workpiece W. The ring roll molding machine 10 is further provided with a center ring roll 15 that is disposed on the outer peripheral side of the annular workpiece W, smoothly rotates the annular workpiece W, and holds a perfect circle. For example, one centering roll 15 is disposed on each side of the forming roll 11.

  At least one of the mandrel 12, the axial roll 13, the measurement roll 14, and the centering roll 15 is made of a steel material whose surface is hardened by induction hardening at least at a portion in contact with the annular workpiece W. . As a steel material constituting these, for example, a chromium molybdenum steel material (SCM material), a nickel chromium molybdenum steel material (SNCM material), or an SKD material (JIS standard SKD material and its improved steel type) is preferable. Thereby, it is cheap and surface hardness can be raised to about HRC59.

  For example, the ring roll forming machine 10 manufactures a ring roll product as follows. First, for example, the outer peripheral surface of the forming roll 11 is disposed in contact with the outer peripheral surface of the annular workpiece W, and the outer peripheral surface of the mandrel 12 is disposed in contact with the inner peripheral surface of the annular workpiece W. . Next, while rotating these, the forming roll 11 and the mandrel 11 are moved so as to be relatively close to each other. Thereby, the thickness of the annular workpiece W is reduced, and the diameter of the annular workpiece W is enlarged correspondingly. The outer diameter of the annular workpiece W is measured by the measuring roll 14, and the elongation in the direction perpendicular to the radial direction of the annular workpiece W is rolled and controlled by the pair of axial rolls 13.

  Thus, according to the present embodiment, at least one of the mandrel 12, the axial roll 13, the measurement roll 14, and the centering roll 15 is at least a portion that contacts the annular workpiece W by induction hardening. Since it is cured, the wear resistance can be improved at low cost and easily.

  The present invention has been described with reference to the embodiment. However, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, each component has been specifically described. However, not all the components may be provided, and other components may be provided.

  It can be used for the ring roll method.

  DESCRIPTION OF SYMBOLS 10 ... Ring roll molding machine, 11 ... Forming roll, 12 ... Mandrel, 13 ... Axial roll, 14 ... Measuring roll, 15 ... Centering roll, W ... Circular workpiece

Claims (2)

A ring roll forming machine that manufactures a ring roll product by expanding the diameter while thinning an annular work,
A forming roll that is disposed on the outer peripheral side of the annular workpiece and forms an outer diameter shape,
A mandrel that is arranged on the inner peripheral side of the annular workpiece and forms the shape of the inner diameter;
A pair of axial rolls arranged so as to sandwich the annular work piece in a direction perpendicular to the radial direction, and rolling in a direction perpendicular to the radial direction;
A centering roll that is arranged on the outer peripheral side of the annular workpiece, smoothly rotates the annular workpiece, and holds a perfect circle;
It is arranged on the outer peripheral side of the annular workpiece, and comprises a measuring roll for measuring the outer diameter of the annular workpiece,
At least one of the mandrel, the axial roll, the centering roll, and the measuring roll is made of a steel material having a surface hardened by induction hardening at least at a portion that contacts the annular workpiece. Ring roll forming machine.   The ring roll forming machine according to claim 1, wherein the steel material is made of a chromium molybdenum steel material, a nickel chromium molybdenum steel material, or an SKD material.

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