JPH1133667A - Forming device of cup-shaped socket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the cup-shaped socket member with the stable mechanical strength. SOLUTION: A forming device plastically forms a rough shape stock by an external die 2 and an internal die 3 to provide a cup-shaped socket member 1. The forming clearance tda between the external die 2 and the internal die 3 to form an opening end part 1a of the cup-shaped socket member 1 to the prescribed thickness is formed to be smaller than the forming clearance tdb between the external die 2 and the internal die 3 to form a cup part 1b continuous to the opening end part 1a to the prescribed thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cup-shaped socket member forming apparatus suitable for manufacturing a cup-shaped socket member applied to an outer ring member or the like as a driving element or a driven element of a universal joint.

[0002]

2. Description of the Related Art A molding apparatus for a cup-shaped socket member of this type is provided with an outer die and an inner die as shown in, for example, Japanese Patent Application Laid-Open No. 5-96339. By applying plastic working to the material, a cup-shaped socket member is obtained.

[0003]

However, in the prior art, the molding gap between the outer die and the inner die, which forms the opening end of the cup-shaped socket member to a predetermined thickness, has an opening. The cup portion following the end portion is formed to have the same size as the molding gap between the outer die and the inner die for forming a predetermined thickness.

[0004] Therefore, when the cup-shaped socket member is plastically worked into a predetermined shape by the outer die and the inner die, the open end of the cup is coupled with the fact that the material easily flows in the axial direction, and thus the cup-shaped socket member is formed. When the socket member has a complicated shape and the amount of plastic deformation is large, the wall thickness of the cup-shaped socket member is locally reduced in the cup portion, etc. by applying tensile force to the rough material at the corner of each die. However, there is a possibility that the mechanical strength is reduced.

The present invention has been devised in view of the above-mentioned conventional circumstances, and has as its object to provide a molding apparatus capable of obtaining a cup-shaped socket member having stable mechanical strength.

[0006]

SUMMARY OF THE INVENTION Accordingly, the invention according to claim 1 is an apparatus for forming a cup-shaped socket member, which obtains a cup-shaped socket member by plastically processing a crude material with an outer die and an inner die. Forming a gap between an outer die and an inner die for forming the opening end of the cup-shaped socket member to a predetermined thickness, and forming an inner die and an inner die for forming a cup portion following the opening end to a predetermined thickness. It is configured to be smaller than the molding gap between the die.

Here, the cup-shaped socket member is formed by plastic working using a press or the like, and is obtained through a plurality of forming steps.

That is, a rough shaped material is formed from a plate-shaped material, and the rough shaped material is plastically processed by an outer die and an inner die to obtain a cup-shaped socket member.

The coarse material is formed in a cup shape, and the thickness thereof is equal to or slightly larger than the thickness of the cup-shaped socket member obtained in the final step.

In the final step, the rough material is disposed between the outer die and the inner die, and the outer material and the inner die are subjected to plastic working to form the cup having a predetermined shape. A socket member is obtained.

At this time, in the molding apparatus of the present invention,
A molding gap between the outer die and the inner die for forming the opening end of the cup-shaped socket member to a predetermined thickness is formed between the outer die and the inner die for forming the cup portion following the opening end to the predetermined thickness. It is formed smaller than the molding gap between the die.

For this reason, when the coarse material is plastically worked into a predetermined shape by the outer die and the inner die in the final step, a large compressive stress is applied to the open end of the cup-shaped rough material, and the cup-shaped rough material is subjected to a large compressive stress. The flow of material to the outside from the molding gap for molding the open end of the socket member is prevented.

[0013] Thereby, the cup-shaped rough material is filled in the forming gap between the outer die and the inner die,
The die is plastically worked into a predetermined shape, and a cup-shaped socket member having a predetermined thickness is obtained.

In this case, the thickness of the cup-shaped socket member can be arbitrarily set according to the size of the molding gap between the outer die and the inner die. However, it is necessary that the crude material has a volume enough to fill the volume in the molding gap between the outer die and the inner die.

Therefore, a molding device capable of obtaining a cup-shaped socket member having stable mechanical strength can be obtained.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a cross-sectional view of a forming apparatus showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of a cup-shaped rough material, and FIG. FIG. 4 is a cross-sectional view of a plate-like material obtained by forming a cup-shaped rough material, FIG. 4 is a cross-sectional view of a hemispherical material obtained in a first step, and FIG. It is explanatory drawing shown in the sectional view (c) in the state where the hemispherical material was arranged in the 2nd process metallic mold.

In the drawing, 1 is a cup-shaped socket member,
Reference numeral 2 denotes an outer die, 3 denotes an inner die, and 4 denotes a coarse material for obtaining the cup-shaped socket member 1.

The cup-shaped socket member 1 is formed by plastic working using a press or the like, and is obtained through a plurality of forming steps.

First, as shown in FIG. 4, a plate-shaped material 5 is pressed to form a rough material 4. That is, the plate-shaped material 5 (see FIG. 4A) is press-formed in the first step to obtain a hemispherical material 6 (see FIG. 4B). Subsequently, the hemispherical material 6 is subjected to a second step mold 7 in a second step,
8 (see FIG. 4 (c)), and plastic working is performed by the second step dies 7, 8 to obtain the rough material 4.

The coarse material 4 is formed in a cup shape, and has an opening end 4a whose diameter is increased outward in the radial direction, a substantially cylindrical cup portion 4b following the opening end 4a, and a cup. It has a hemispherical bottom portion 4c which is connected to the portion 4b with a reduced diameter, and a reduced diameter step portion 4d is formed between the cup portion 4b and the bottom portion 4c. The thickness of the coarse material 4 is substantially equal to the thickness t of the plate-like material 5.

Next, the rough material 4 is disposed between the outer die 2 and the inner die 3 in the final process die, that is, the outer die 2 and the inner die 3 in the final process. Apply plastic working.

More specifically, the outer die 2 is provided with a rough material 4
An open end portion 2a in contact with the open end portion 4a, a cup portion formed portion 2b in contact with the cup portion 4b, a bottom portion 2c in contact with the bottom portion 4c, and a step portion 2d in contact with the reduced diameter step portion 4d. It has. The inner die 3 has an opening end forming portion 3a in contact with the opening end 4a of the coarse material 4, a cup forming portion 3b in contact with the cup portion 4b, a bottom forming portion 3c in contact with the bottom 4c, and a reduced diameter. A step forming section 3d that is in contact with the step 4d. In this embodiment, the coarse material 4 is placed on the inner die 3.

Thereafter, the outer die 2 arranged in alignment with the inner die 3 is moved in the axial direction, so that the rough material 4 is subjected to plastic working.

That is, the opening end 4a of the crude material 4 is pressurized in the forming gap tda between the opening end forming part 2a of the outer die 2 and the opening end forming part 3a of the inner die 3, and the cup is pressed. The open end 1a of the cup-shaped socket member 1 is formed, and the cup portion 4b of the crude material 4 is pressed by the forming gap tdb between the cup-shaped forming portions 2b and 3b.
Of the bottom portion 2c, 3c
c, the bottom 4c of the crude material 4 is pressurized in the molding gap tdc to form the bottom 1c of the cup-shaped socket member 1. Similarly, the molding material 4 is formed in the molding gap tdd between the step molding parts 2d, 3d.
Is pressed to form the reduced diameter step 1d of the cup-shaped socket member 1.

As a result, plastic processing is performed on the rough shaped material 4 to obtain the cup-shaped socket member 1 having a predetermined shape.

At this time, in the molding apparatus of the present invention,
A molding gap tda between the outer die 2 and the inner die 3 for molding the open end 1a of the cup-shaped socket member 1 to a predetermined thickness makes the cup 1b following the open end 1a a predetermined thickness. It is formed smaller than the molding gap tdb between the outer die 2 and the inner die 3 to be molded.

For this reason, when the cup-shaped rough material 4 is plastically worked into a predetermined shape by the outer die 2 and the inner die 3 in the final step, the open end 4a of the cup-shaped rough material 4 A large compressive stress is applied, and the flow of the material to the outside from the molding gap tda for molding the open end 1a of the cup-shaped socket member 1 is prevented.

As a result, the rough material 4 is filled in the molding gap between the outer die 2 and the inner die 3 and is plastically worked into a predetermined shape by the dies 2 and 3 to obtain a predetermined thickness. A thick cup-shaped socket member 1 is obtained.

In this case, the cup-shaped socket member 1
Can be arbitrarily set according to the size of the molding gap between the outer die 2 and the inner die 3. That is, in this embodiment, the thickness is substantially the same as the thickness t of the plate-shaped material 5. However, the thickness can be made larger than the thickness t of the plate-shaped material 5. . However, in any case, it is necessary that the crude material 4 has a volume enough to fill the volume in the molding gap between the outer die 2 and the inner die 3.

Therefore, according to the present invention, a molding device capable of obtaining the cup-shaped socket member 1 having stable mechanical strength is obtained.

Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to this embodiment and can be changed without departing from the spirit of the invention.
For example, the embodiment has been described in which the outer die 2 is relatively moved in the axial direction to perform plastic working on the rough shaped material 4.
Not limited to this, the outer die 2 and / or the inner die 3
May be divided into a plurality of parts in the axial direction, and the outer die and / or the inner die divided into the plural parts may be moved in the radial direction to perform plastic working on the rough material 4.

[0033]

As described in detail above, according to the present invention, a molding apparatus capable of obtaining a cup-shaped socket member having stable mechanical strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a molding apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a crude material.

FIG. 3 is a cross-sectional view showing a state where a crude material is disposed in a molding apparatus of the present invention.

FIG. 4 is a cross-sectional view of a plate-shaped material (a), a cross-sectional view of a hemispherical material obtained in a first step (b), and a hemispherical material used in a second-step metallurgy. It is explanatory drawing shown in sectional drawing (c) of the state arrange | positioned in the type | mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cup-shaped socket member 1a Open end 1b Cup part 1c Bottom part 2 Outer die 3 Inner die 4 Coarse material tda, tdb Forming gap

Claims (1)

[Claims] 1. A cup-shaped socket member forming apparatus for obtaining a cup-shaped socket member by plastically processing a crude material with an outer die and an inner die, wherein an opening end of the cup-shaped socket member has a predetermined thickness. The molding gap between the outer die and the inner die is formed to be smaller than the molding gap between the outer die and the inner die for molding the cup portion following the opening end to a predetermined thickness. An apparatus for forming a cup-shaped socket member, characterized in that: