JPH02179338A - Method for forging deformed ring - Google Patents

Abstract

PURPOSE:To reduce wt. of a raw material and man-hour of machining by partially rolled-forging an end face of the straight ring raw material with an anvil to make this bulging, forged-pressing the bulging end-part with the anvil to adjust the shape and dimension thereof and making the deformed ring. CONSTITUTION:The straight ring raw material 7 heated to the prescribed heating temp. is laid on a surface plate 8 and partially rolling-forged with a flat anvil 9 or bar-like anvil 10 and gradually forging-pressed until the required end part thickness is secured to make a raw forged pipe 11. Successively, the obtd. raw forged pipe 11 is adjusted in the shape and dimension while applying the forged-pressing this in the radius direction with a V-shape anvil 12 or R-shape anvil 13 at upper and lower sides to make the deformed ring 14. By this method, the deformed ring 14 having the different thickness at the end parts and the equal outer diameter, is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of forming a deformed ring having a wall thickness difference at the end, which is used, for example, as a component of a rolling plant.

[Prior Art] For example, a rolling plant component shown by 6 in FIG. 7, which has a difference in wall thickness at the end of the ring, is made by forging holes in a rough material 1 and forming holes in the rough material 1, as shown in FIG. The raw material 2 was first subjected to hole expansion forging to produce a straight ring-shaped forged product 3, and finally, a machined product 4 was obtained by cutting by machining to ensure a predetermined product shape and size.

[Problems to be Solved by the Invention] However, in the conventional manufacturing method described above, the weight of the rough material 1 is large, and as shown in the longitudinal cross-sectional view of FIG.
In order to machine a machined product with a vertical cross section of 6 from a straight ring-shaped forged product with a shape of Also, a lot of time was spent on machining.

This led to increased costs.

[Means for Solving the Problems 1 Effect] The present invention was made as a result of various studies in view of the above-mentioned circumstances. Alternatively, use a rod-shaped anvil to partially reduce the thickness of the end to increase the wall thickness, and then use a V-shaped or R-shaped concave anvil to reduce the thickened end in the radial direction to adjust the shape and dimensions. This method solves the problems of the conventional method by forming an irregularly shaped ring with a difference in wall thickness at the end portions and performing a machining finish on this irregularly shaped ring.

The present invention will be specifically explained below based on the drawings. 1st
The figure shows the forging process according to the present invention.

The straight ring material 7 heated to a predetermined heating temperature is placed on a surface plate 8 and partially rotary forged using a flat anvil 9 or a rod-shaped anvil 10 to ensure the required end wall thickness. The pressure is sequentially reduced until the initial pressure is reached to form a plain pipe 11. The shape of the end at this time is as shown in 16 in Figure 2, the wall thickness increases and the external shape expands into a trumpet shape, but the lower surface of the straight ring material as shown in Figure 1 connects to the surface plate 8. No deformation of the contact surface occurs.

The main reason for this is that the lower surface of the straight ring material is fixed to the surface plate, so there is no deformation of the lower surface.

Next, the shape and dimensions of the obtained prefabricated pipe 11 are adjusted using upper and lower V-shaped anvils 12 or R-shaped anvils 13 while applying pressure in the radial direction to form a deformed ring 14.

With these, it is possible to obtain a deformed ring 14 with a uniform outer diameter and a difference in wall thickness at the ends, but depending on the purpose, by adjusting the amount of reduction applied in the radial direction,
It is also possible to manufacture a ring with a stepped outer diameter as shown at 17 in FIG. In addition, by applying the above process to both end surfaces of the straight ring material, (A) and CB in FIG.
It is also possible to mold a deformed ring having a difference in wall thickness at both ends of the ring as shown in Figure 2, and the range of applications for molding a deformed ring having a difference in wall thickness at the end faces of the ring is wide.

Next, further details will be explained using examples.

[Example] For the purpose of manufacturing a rolling plant component having the shape and dimensions shown in Fig. 5, the yield and machining time when a straight ring material is first forged and then manufactured by the process according to the present invention by the conventional method. So No. 1 Table machine cutter = (Product weight/Forged molding, tt)Xl(3
)% and are shown in Table 1. It can be clearly seen that the method according to the present invention is superior.

[Effects of the Invention] As is clear from the above embodiments, according to the present invention, the weight of the material and the number of machining steps are extremely reduced. It can be forged into a specific shape, and has significant industrial effects.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a method for forging a deformed ring according to the present invention. FIG. 2 is a diagram showing changes in the longitudinal cross-sectional shape at each stage in the method for forging a deformed ring according to the present invention. 3 and 4 are diagrams showing an application example of the present invention, and FIG.
The figure is a diagram showing an example of components of a rolling plant according to an embodiment. FIG. 6 is a diagram illustrating a ring manufacturing process using a conventional method, and FIG. 7 is a diagram illustrating machining of a conventional straight ring-shaped forged product. 1: Raw material, 2: Perforated material, 3 Nistredo ring-shaped forged product, 4: Machined product. 5: Cross-sectional view of conventional forged product (straight ring-shaped forged product), 6: Vertical section of machined product, 7: Straight ring material, 8: Surface plate, 9: Flat anvil, 10: Bar-shaped anvil, 11 : Plain pipe construction, 12: V-shaped anvil, 13: R
shaped anvil, 14: odd-shaped ring, 15 longitudinal section of Nistrade ring material, 16.16': thick end part, 17:
Longitudinal cross section of an irregularly shaped ring with a stepped outer diameter. Patent applicant: Japan Casting and Forging Steel Co., Ltd.

Claims (1)

[Claims] The end surface of the straight ring material is partially reduced in the axial direction with a flat or rod-shaped anvil to increase the thickness of the end of the straight ring material, and then the thickened end is reduced with a V-shaped or R-shaped concave anvil. 1. A method for forging an irregularly shaped ring, which comprises adjusting the shape and dimensions by reducing the portion in the radial direction, and forming a ring having a wall thickness difference at the end portions.