JPH09122810A - Forging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To forge a material having large deformation resistance by forging using a forging tool, having a semi-circular shape of cross section and a projected shape facing to an anvil, and the same shape of anvil. SOLUTION: Cold forging is applied to the material 4 to be forged using a forging press having the about semi-circular type of cross section and the projected shape facing to the anvil 2 or the forging tool 1 as the forging tool 1 or the anvil 2. As the material to be forged, simple metal, etc., such as a high strength brass, steel, other copper alloy, titanium, etc., having large deformation resistance are applied. The material is also applied to warm and hot forging besides cold forging. According to this method, even the material incapable of forging for lack of pressing ability is allowed to forge. The forging tool 1 and the anvil 2 having a circular arc shape of forging surface are easily manufactured by longitudinally cutting a cylindrical stock.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging method, and more particularly to a forging method using a forging tool having a curved forging surface and an anvil.

[0002]

2. Description of the Related Art Conventionally, when a plate-like body is formed by a forging machine such as a forging machine or a forging press, it is usually required to use the methods shown in FIGS.
As shown in FIG. 3, forging tools (hammer) (1) and anvil (2) having flat forging surfaces were used. Further, in a method of manufacturing a metal ring by forging, it is known to use a forging tool having a semicircular cross section and an anvil having a flat forging surface (Japanese Patent Laid-Open No. 58-2094).
No. 41).

[0003]

However, in the conventional method for forging using the forging tool (1) and the anvil (2) having a flat forging surface, the area of the forging surface is wide because the forging is flat. Moreover, since the capacity of the forging device is limited, it is often impossible to forge a material having a large deformation resistance. Therefore, it is conceivable to narrow the width of the forging tool and the anvil to narrow the forged surface, but if the width is narrowed, the strength becomes insufficient, and it has not been possible to make it so narrow. Further, the forging method using a forging tool having a semicircular cross section is a method of forging a metal ring, not for forging a material having a large deformation resistance,
Nor is it a forging method that uses an anvil with a semicircular cross section. An object of the present invention is to provide a forging method capable of forging even a material having a large deformation resistance.

[0004]

To achieve the above object, in the forging method of the present invention, a forging tool having a cross section of a substantially semicircular shape and a shape projecting toward an anvil and a cross section of a substantially semicircular shape are used. , Forging using an anvil having a shape protruding toward the forging tool.

The forging method of the present invention is cold, warm and hot forging. The materials to be forged that can be forged by the forging method of the present invention are steel, copper alloys, Ni alloys, alloys such as Ti having a large deformation resistance, and single metals.

The "substantially semicircular section" of the forging tool and anvil used in the forging method of the present invention means that the section is semicircular (see FIG. 1).
2a), a semi-ellipse (d in FIG. 2 (hereinafter the same)), a polygon with rounded corners (g), a circle smaller than half (b), an ellipse (e) and rounded corners. (H), a circle (c) larger than half, an ellipse (f), and a polygon with rounded corners (i).

[0007]

In the forging method of the present invention, since the forging tool and the anvil have a substantially semicircular cross section and have a shape protruding toward the anvil or the forging tool, forging is performed in one hammering. Although the amount that can be produced is small, the forging force may be small, and since the forging tool and the anvil have a substantially semicircular cross section, the strength of the forging tool and the anvil will not be insufficient. Further, when the forging tool and the anvil have a semicircular cross section, the forging tool and the anvil can be manufactured by vertically cutting a columnar material, so that the manufacturing is simple.

[0008]

Embodiments of the present invention will be described below. As shown in FIGS. 5 and 6, the width is 125 mm,
An attempt was made to cold forge the following forging object 4 with a forging press (3) of 3500 tons using an anvil (1) having a forging surface of 1000 mm in length and a forging tool (2), but the ability of the forging press was insufficient. That is, although a capacity of about 4500 tons was required, cold forging could not be performed because the capacity of the forging press was 3500 tons. The material of the forging is
High-strength brass composed of Al: 1.0%, Cr: 1.0%, Cu: 98%, with a deformation resistance of 40 kg / mm ^{2 and} a thickness of 90 m.
It is a plate-like body having m, a width of 900 mm and a length of 3000 mm.

Therefore, as shown in FIGS. 1, 3 and 4, a cylindrical body of hot die steel having a diameter of 500 mm and a length of 1000 mm cut at the center has a semicircular cross section and a length of 10 mm.
Using a 00 mm anvil (1) and a forging tool (2), the above-mentioned object to be forged (4) was cold forged using the above 3500t forging press (3). Since the forging of the above material could be performed at 1500 t, it was possible to forge a plate having a thickness of 45 mm without any problem.

In the above embodiment, cold forging of high-strength brass was carried out, but other alloys such as steel, other copper alloys, and simple metals such as Ti can also be used. Further, although the above embodiment is cold forging, it can be carried out for hot forging, warm forging, straightening and the like.

[0011]

According to the present invention, the following excellent effects can be obtained by employing the above-described structure. (1) With the conventional method, it is possible to forge a material that could not be forged due to insufficient press capacity. (2) Since a forging tool and anvil with an arc-shaped forging surface can be manufactured by cutting a cylindrical material, the forging tool and anvil can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of an example forging tool and anvil used in the method of the present invention.

FIG. 2 is a cross-sectional view of various forging tools and anvils used in the method of the present invention.

FIG. 3 is a front view for explaining the forging method of the present invention.

FIG. 4 is a side view for explaining the forging method of the present invention.

FIG. 5 is a front view for explaining a conventional forging method.

FIG. 6 is a side view for explaining a conventional forging method.

[Explanation of symbols]

 1 Forging tool 2 Anvil 3 Forging press 4 Workpiece

Claims (1)

[Claims] 1. A forging tool (1) having a substantially semicircular cross section and projecting toward an anvil, and a substantially semicircular cross section,
A forging method, characterized in that forging is performed using an anvil (2) having a shape protruding toward a forging tool.