JPH0787961B2 - Ring rolling method and device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a ring rolling method and apparatus.

[Prior Art] As shown in FIG. 4, a conventional ring rolling apparatus for rolling a ring tube a to manufacture a ring product having an irregular cross section has a pair of upper hole type rolls b which rotate in parallel with each other. And the lower hole type roll c are supported by the shaft boxes d and e, the upper hole type roll b is provided with a convex type roll f having a predetermined width, and the lower hole type roll c has a predetermined groove width. It has a concave roll g.

In the above apparatus, the ring element tube a is inserted between the upper hole type roll b and the lower hole type roll c, and the upper hole type roll b and the lower hole type roll c are rotated by a driving device (not shown). On the other hand, a ring-rolling is carried out by applying a pressure reduction to the ring tube a through an upper hole type roll b by a reduction device (not shown).

[Problems to be Solved by the Invention] However, in the above-described conventional ring rolling method and device, since the hole-shaped rolls b and c are rolled without shifting, a raw tube having a width close to the product width is required. In addition, since there are various product widths, it is difficult to manage materials because many types of raw tubes are required. When the hole-shaped rolls b and c are rolled without shifting, they extend in the week direction of the ring tube, but do not extend so much in the width direction.Furthermore, between the center and both ends of the ring tube in the width direction. Tension is generated, resulting in defective shape of the rolled ring product. Therefore, in order to prevent the occurrence of defective shape of this ring product, adopting a method of exchanging the hole roll at each stage of progress of rolling, it is necessary to prepare a hole roll according to the stage of rolling. It is necessary to prepare the number of holes corresponding to the product size of the ring product. For this reason, in the conventional means, a large number of die rolls are required, and it is necessary to perform a die roll exchange operation that requires time and labor at each stage of the above rolling or for each ring product having a different size. There is a problem called.

In view of the above-mentioned circumstances, the present invention provides a ring rolling method and apparatus that prevent the occurrence of defective shape of a ring product and prepare a large number of hole type rolls or do not need to replace the hole type rolls. It was done in order to do.

[Means for Solving the Problem] The present invention is directed to an axial direction during rolling of a portion of a pair of hole-shaped rolls arranged in parallel at which a thick portion of a ring element pipe of at least one hole-shaped roll is machined. While supporting the ring element pipe, while shifting the portion of the pair of hole-shaped rolls for processing the thick portion of the ring element tube of at least one of the hole-shaped rolls in the axial direction during rolling, , Roll to a specified thickness.

[Operation] Therefore, in the present invention, since ring rolling can be performed while reciprocating the shiftable hole-type roll in the width direction of the ring element pipe, it is possible to prevent the defective shape of the ring product from occurring and to perform rolling. It is not necessary to replace the hole rolls for each progressing stage or for ring products having different sizes, and the efficiency of the rolling operation can be improved.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 3 (A) and (B) show an embodiment of the present invention, which includes an upper hole type roll 1 and a lower hole type roll 2 which rotate in parallel with each other. Is provided with a convex roll 5 having a width narrower than the width of the ring element pipe 4 at the center of the shaft 3 of the upper hole type roll, and is freely rotatable by a shaft box 6 which is moved up and down by a reduction device (not shown). It is supported and is shiftable in the axial direction by a shift cylinder 7 connected to one end of the shaft 3.

The lower hole type roll 2 is provided with a concave type roll 9 having a predetermined groove width in the central portion of the shaft 8 portion of the lower hole type roll.
It is rotatably supported by 10.

FIG. 2 shows a post-process hole roll, and an upper hole roll 11 having a flat roll having the same width as the ring product,
It consists of a lower roll 12 with a concave roll having the same groove width as the width of the ring product.

The ring element pipe 4 formed into a cylindrical shape in the previous step is suspended on the lower hole type roll 2 and the shift cylinder 7 is operated to shift the upper hole type roll 1, whereby the ring element pipe 4 is suspended. After moving the upper hole type roll 1 directly above the lower hole type roll 2, a rolling down force is applied to the ring tube 4 via the upper hole type roll 1 by a rolling down device (not shown), and not shown. The upper hole type roll 1 and the lower hole type roll 2 are rotated by a driving device to start rolling from the central portion of the ring raw tube 4 and roll the central portion of the ring raw tube 4 to a desired thickness.

Next, after pulling up the upper hole type roll 1 to maintain an appropriate gap between the upper hole type roll 1 and the ring tube 4, the shift cylinder 7 is operated to move the upper hole type roll 1 to the upper hole. The ring roll 4 is shifted to the right or left by a distance slightly smaller than the width of the rolling surface of the die roll 1, and a rolling force is again applied to the ring element pipe 4 via the upper hole die roll 1 to roll it to a desired thickness.

As described above, rolling is repeated while alternately shifting the upper hole-type roll 1 to the left and right (in the direction of the arrow in the figure), rolling to the desired thickness and widening the width to obtain the ring product of the desired size. And

Further, in a subsequent step, the ring product is hung on the hole-type rolls 11 and 12 shown in FIG. 2 and widened and rolled. From the modified cross-section ring product shown in FIG. 3 (A) to that shown in FIG. 3 (B). Ring rolling into rectangular section ring products.

According to the above, since the upper hole type roll can be shifted, it is possible to reduce the number of types of the ring element pipe, facilitate the widening and rolling, and prevent the defective shape of the ring product from occurring. Further, it is not necessary to prepare a large number of hole-shaped rolls for each stage of rolling or for each ring product having a different size, and therefore, the complicated work of replacing the hole-shaped rolls is not required. A ring product having an asymmetric cross section can be easily obtained by appropriately selecting a post-process roll.

In the embodiment of the present invention, the case where the upper hole type roll is shifted has been described, but the lower hole type roll may be shifted, or both the upper and lower hole type rolls may be shifted. Needless to say, various changes can be made without departing from the scope of the present invention.

[Effects of the Invention] As described above, according to the ring rolling method and apparatus of the present invention, it is easy to manage the ring tube and it is not necessary to replace the hole rolls. Therefore, it is possible to achieve various excellent effects such as shortening, labor saving, and significant improvement in production efficiency.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the ring rolling method and apparatus of the present invention, FIG. 2 is an illustration of a hole-type roll in the post-process of the embodiment of FIG. 1, and FIGS. ) Is an explanatory view of the rolling process by the hole type roll of FIG. 2, and FIG. 4 is an explanatory view of a conventional ring rolling method and apparatus. In the figure, 1 is an upper hole type roll, 2 is a lower hole type roll, 4 is a ring tube, 5 is a convex roll, 7 is a shift cylinder, and 9 is a concave roll.

Claims (2)

[Claims] 1. With respect to a ring element pipe, a portion of at least one of the hole type rolls for processing the thick portion of the ring element tube is set in a predetermined direction while being axially shifted during rolling. A method for rolling a ring, which comprises rolling to a predetermined thickness. 2. A pair of hole rolls arranged in parallel, wherein at least one of the hole rolls has a portion for processing a thick portion of a ring element pipe, which is supported so as to be axially shiftable during rolling. And ring rolling equipment.