JP3216733B2 - Forging equipment for stepped cup-shaped parts that form part of the outer wall to be thick - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for forging a stepped cup-shaped part for forming a part of an outer wall of a cup-shaped part to be thick.

[0002]

2. Description of the Related Art A stepped cup-shaped part is manufactured by forming a thickened part in which the thickness of the part is larger than that of other parts in order to perform spline processing or tapping on the outer wall of the cup-shaped part. In the prior art, a part of the outer wall is ironed from a drawn cup as shown in FIG. 4 to form a step on the outer wall, or a part of the outer wall is upset as shown in FIG. A method of forming a step is known.

In FIGS. 4A and 4B, reference numeral 1 denotes a cup-shaped part,
Reference numeral 2 denotes a die, and reference numeral 3 denotes a punch. When the cup-shaped component 1 is put into the die 2 and ironing is performed, a thick portion 4 is formed on the outer wall of the cup. However, there is no process that thickened the part in forming a thick portion of the outer wall in the machining process, larger than bottom thickness t ₀ is the large-diameter portion t ₁ of absolutely wall thickness. This means that since the cup-shaped part 1 is drawn from a plate material, the thickness of the cup-shaped part as a processing material is all equal.

[0004] Therefore, as shown in FIG. 4C, bottom thickness t ₂
The in obtaining the the same as the side wall thickness t _3, there is a problem that it is necessary to measures such as obtaining a molded article 5 in the bottom thickness t ₂ by cutting the bottom thickness t ₀ shown in Figure 4B.

On the other hand, in FIG. 5, reference numeral 10 denotes a cup-shaped part, 11 denotes a die, 12 denotes a mandrel, 13 denotes a counter punch, and 14 denotes a ring-shaped punch. Perform upset processing. In this case, the height L of the portion to be compressed in FIG.
There becomes equal to or larger than 2 to 2.5 times the thickness t _4, cause buckling the portion as shown in FIG. 5B, there are problems such as defects overlap meat wall occurs.

[0006]

The problem to be solved by the present invention is that when forming a part of the outer wall of the cup-shaped part to be thick, it is possible to form the part without causing defects due to buckling in the part. An object of the present invention is to provide a forging method and apparatus.

[0007]

Means for solving the problem are a cup-shaped material having an outer wall portion having a substantially uniform thickness.
Forging machine for processing a part of the outer wall of
And a die (21) in which a large-diameter hole (22), a conical approach portion (23), and a small-diameter hole (24) are continuously formed from the open end, and into the die (21). lifting and, and, with the mandrel (25) to the small diameter portion (26) is formed at the distal end, a counter punch corresponding to the mandrel (25) is elastically supported within the die (21) (27) A ring-shaped punch (29) slidably provided on the outer periphery of the mandrel (25) and having a tip end facing the approach portion (23) of the die (21) ;
The die (21) is placed on the counter punch (2).
7) a base (20) whose lower surface is formed to be abuttable;
Having the mandrel (25) at the bottom of the cup-shaped material.
The mandrel (25) and the
The bottom of the cup-shaped material is removed by a counter punch (27).
Draw the cup-shaped material while holding it
Then, the ring-shaped punch (29) is operated to operate the cup.
By pressing the opening of the shape material,
The material is flowed, the mandrel (25), the counter
Punch (27) and ring-shaped punch (29)
And move the lower surface of the counter punch (27)
After making contact with the table (20), the ring-shaped punch (2
9) to further lower the mandrel (25)
Formed by the diameter portion (26) and the inner diameter of the cup-shaped material.
Characterized in that the material is swaged into the space (33)
That forging equipment.

[0008]

1 and 2 are cross-sectional views of a mold for processing according to the present invention, and FIG. 3 is a cross-sectional view showing a processing example of a molded product.

In these figures, reference numeral 20 denotes a base on which a die 21 is placed. The die 21 is provided with a hole 22 and an approach portion 23 corresponding to the outer diameter large diameter portion φd ₁ of the molded product, and a die 21 of the molded product. A hole 24 corresponding to the outer diameter small diameter portion φd ₂ is provided. Reference numeral 25 denotes a mandrel having a small diameter portion 26 at the lower end.
Is provided. 27 is a counter punch elastically supported by a spring 28, and 29 is a ring punch.

In the cup-shaped part 30, the bottom thickness T ₀ and the thickness T _{1 of the} outer wall portion are in a relationship of “T ₀ ≧ T ₁ ”, and T ₁ is a thickness close to the outer wall thin thickness T ₂ of the molded product 31. Having. Here, the cup-shaped component 30 is put into the die 21, and the ring-shaped punch 29 is operated to push the material opening while holding the material bottom by the mandrel 25 and the counter punch 27. Then, the material bottom side is pushed into the approach portion 23, and the counter punch 27 descends with the material,
As a result, a drawing process is performed on the material, and a semi-processed portion 30a whose thickness is slightly increased is formed.

At this time, the material near the approach portion 23 is
The biasing force 32 of the counter punch 27 and the approach portion 2
3, the thickness gradually increases due to the resistance of the semi-processed portion 30a itself. Then, after the counter punch 27 comes into contact with the base 20 (with a body), the ring-shaped punch 29 is lowered and the material is set up in the space 33 formed between the small diameter portion 26 of the mandrel 25 and the material inner diameter. rarely, the semi-processed portion 30a is formed into the thick portion 30b having an outer wall thicker thickness T ₃ becomes machining end.

As described above, in the method of the embodiment, when forming a thick portion, a drawing process is performed to form a semi-processed portion, and then the portion is upset, so that the increase in the thickness is two steps. Therefore, the upsetting can be performed without causing buckling of the thick portion.

The embodiment of the cup-shaped part is shown in FIGS.
In addition, as shown in FIG. 3, a part with a hole (FIG. 3A), a part with a boss (FIG. 3B), and a part with a stepped part in the inner diameter (FIG. 3C)
If it is a cup-shaped part with a thick part on the outer wall,
It goes without saying that other shapes are not limited.

[0014]

According to the present invention, a cup-shaped part in which the large diameter portion of the outer wall is thicker than the bottom can be formed with high precision.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a mold for carrying out the method of the present invention at the start of processing.

FIG. 2 is a cross-sectional view illustrating a state at the time of finishing processing in FIG.

FIGS. 3A, 3B, and 3C are cross-sectional views illustrating examples of molded articles according to the present invention.

FIG. 4 is a cross-sectional view illustrating a processing example according to the related art.

FIG. 5 is a cross-sectional view illustrating another processing example according to the related art.

[Explanation of symbols]

 REFERENCE SIGNS LIST 20 base 21 dice 22 hole 23 approach portion 24 hole 25 mandrel 26 small diameter portion 27 counter punch 28 spring 29 ring-shaped punch 30 cup-shaped component 31 molded product 32 biasing force 33 space

Claims (1)

(57) [Claims] 1. A cup shape having an outer wall portion having a substantially uniform thickness.
MaterialForging machine that processes part of the outer wall of
And  Larger hole (22) from the open end, conical approach (2)
3) and a die in which the small-diameter hole (24) is formed continuously.
Chair (21), and ascends and descends into the dice (21),And,tipSmall diameter
Part (26)A mandrel (25) on which the dies are formed;
A counter punch (27), which is elastically supported by a mandrel (25);
The end is the approach part of the die (21)(23)To
With a ring-shaped punch (29), The die (21) is placed and the counter punch
A base (20) formed so that the lower surface of (27) can be abutted.
When, ToHave Place the mandrel (25) on the bottom of the cup-shaped material.
The above mandrel (25) and the above counter
Punch the bottom of the cup-shaped material with a punch (27)
While drawing the cup-shaped material,
By operating the ring-shaped punch (29),
The material flows to the thick part by pressing the opening
Let The mandrel (25), the counter punch (27)
And further lower the ring-shaped punch (29)
The lower surface of the counter punch (27) is brought into contact with the base (20).
After contact, the ring-shaped punch (29) is further lowered
And the small diameter part (26) of the mandrel (25)
Space formed by the inner diameter of the cup-shaped material (33)
Characterized by swaging material into Forging equipment.