JPH08257640A - Die for bending - Google Patents

Abstract

PURPOSE: To provide a die for bending capable of preventing the underfill of a rough-finished product without increasing the diameter of a stock. CONSTITUTION: A first surface 1a to be bent which is recessed at the center and extends in the X-direction is formed in a fixed die 1. A second surface 2a to be bent which is bulged at the center correspondingly to the first surface 1a to be bent and also extends in the X-direction is formed in a movable die. Inclined surfaces 2b, 2b which are inclined in (X, Y) direction are formed on each side of the second surface 2a to be bent, and flanges 2c, 2c which are opposite to each other and extend in Z-direction are projected at the center of the second surface 2a to be bent. While the fixed die 1 and the movable die 2 are brought close to each other, the inclined surfaces 2b, 2b press each end part of a stock in X-direction, and the flanges 2c, 2c hold the center part of the stock.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending die for bending a rough material. This bending mold is suitable for processing a three-dimensional bending arm used for a vehicle suspension, for example.

[0002]

2. Description of the Related Art Conventionally, when it is desired to obtain a three-dimensionally bent product, bending, roughing, trimming and the like may be performed from a rod-shaped metal rough material. For example, FIG. 7 (A)
FIG. 8 shows a case where a three-dimensional bending arm whose plan view is shown in FIG.
As shown in FIG. 8A, first, a rod-shaped metal rough material W ₀ is prepared, and this rough material W ₀ is bent to obtain the structure shown in FIG.
As shown in (B), a rough U-shaped material W ₁ is obtained.

As a conventional bending die used for this bending, the one shown in FIGS. 9A and 9B can be exemplified. The bending mold includes a fixed mold 91 as a first mold and a second fixed mold 91 which is provided so as to come into contact with and separate from the fixed mold 91.
And a movable mold 92 as a mold. The fixed die 91 has a recessed center, and has a first bending surface 91a extending in a direction (X direction) perpendicular to the plane of the drawing in FIG. Positioning recesses 91b and 91b are provided on both sides of the first bending surface 91a, and a positioning surface 91c is formed outside one of the positioning recesses 91b. On the other hand, the movable die 92 is provided with a second bending surface 92a which is swelled in the center and also extends in the X direction corresponding to the first bending surface 91a.

In such a bending die, first, a fixed die 91 is used.
The rough material W ₀ is placed on the positioning recesses 91b and 91b. At this time, the rough material W ₀ is brought into contact with the positioning surface 91c. Then, the movable die 92 is moved in the Y direction to approach the fixed die 91. Among the directions orthogonal to the Y direction, the direction orthogonal to the coarse material W ₀ is the X direction, and the direction parallel to the coarse material W ₀ is the Z direction. As a result, as shown in FIGS. 10 (A) and 10 (B), the rough material W _{0 is applied} to the first bending surface 91a.
And the second bending surface 92a. Thus
It is possible to obtain a roughly U-shaped rough material W ₁ .

The rough-shaped material W ₁ thus obtained is rough-processed by a rough-work die to obtain a rough product. Then, the rough product is made into a product by removing burrs by finishing such as trimming. A technique similar to the above is disclosed in Japanese Patent Laid-Open No. 4-846.
No. 40 and Japanese Patent Laid-Open No. 6-238386.

[0006]

However, in the conventional bending die described above, the movable die 92 is brought relatively close to the fixed die 91 to bend the rough material W ₀ in only one direction in the Y direction. Therefore, the obtained crude material W ₁ is not bent in the X direction as shown in FIG. For this reason, when this rough-shaped material W ₁ is subjected to roughing, a rough product, and eventually a specific portion of the product, is likely to be lacked.

That is, as the rough terrain mold, the rough terrain mold illustrated in FIGS. 12A and 12B is prepared. This wasteland type is
It comprises a fixed die 81 and a movable die 82 which is provided so as to be able to come into contact with and separate from the fixed die 81. The fixed die 81 and the movable die 82 have concave shaping surfaces 81a and 82a for shaping the general shape of the product, respectively. It is set up. The rough material W ₁ is placed on the fixed die 81 of the rough land type, and the movable die 82 is brought close to the fixed die 81 to perform punching to obtain a rough product.

Here, since the product needs to be bent also in the X direction as shown in FIG. 7B, the shaping surface 81a is in the X direction as shown in FIG. 12A. There is a step according to the degree of bending ΔX. Therefore, when placing St. coarse profile W ₁ that are not in any way bent in the X direction on the fixed mold 81, Sokatachizai W ₁ by its own weight in Fig. 12 (A) from the state of FIG. 11 As in the rough material W ₁ shown, both ends are in a state of being lifted up a little compared with the center. In this case, as shown in FIG. 12 (B), since both ends of the rough-shaped material W ₁ are displaced from the axis of the shaping surface 81a, if the stamping is performed in this state, the rough product will be defective Will be higher. In particular, if the product is a suspension arm, it is easy for the bosses at both ends to have underfills.

Therefore, in the prior art, in order to reliably prevent the thin product of the rough product, the diameter of the rough material W ₀ is increased and the deviation of the rough surface W ₁ from the axis of the shaping surface 81 a is prevented. Had to prevent. The problems such as waste of material cost, increase of trimming cost, shortening of life of the rough land mold due to increase of mold wear, etc. due to the increase of burrs caused in this way have been settled.

The present invention has been made in view of the above-mentioned conventional circumstances, and it is an object of the present invention to provide a bending die capable of preventing the blank thickness of a rough product without increasing the diameter of the rough material. To aim.

[0011]

A bending die according to the present invention has a first bending surface, a first die for placing a rough material on the first bending surface, and the first bending work. A second mold having a second bending surface having a shape corresponding to the surface, the first mold and a second mold provided so as to be capable of relative contact and separation, and by bringing the second mold relatively close to the first mold, In a bending die for bending the rough material with the first bending surface and the second bending surface to obtain a rough material, at least one of the first die and the second die is relatively During the approach, a pressing portion that presses a part of the rough material to the outside of the approach direction and a holding portion that holds the other portion of the rough material are formed.

[0012]

In the bending die of the present invention, the pressing portion presses a part of the rough material out of the approaching direction during the relative approaching of the first die and the second die. During this time, the holding portion holds the other portion of the rough material, and the pressing portion prevents the entire rough material from moving out of the approaching direction.
Therefore, the obtained rough-shaped material is bent in the approaching direction and a direction different from the approaching direction.

[0013]

Embodiments Embodiments 1 and 2 embodying the present invention will be described below with reference to the drawings. (Embodiment 1) The bending die of Embodiment 1 is also used for machining the upper control arm used for the suspension of the vehicle, and as shown in FIGS. 1 (A) and 1 (B), the first die is used. And a movable mold 2 as a second mold which is provided so as to be able to come into contact with and separate from the fixed mold 1.

The fixed die 1 has a recessed center and a first bending surface 1a extending in a direction (X direction) perpendicular to the plane of FIG. Also, this first bending surface 1a
Positioning recesses 1b, 1b are provided on both sides of the positioning recess 1b, and a positioning surface 1c is provided outside one positioning recess 1b.
Are formed. On the other hand, the movable die 2 is formed with a second bending surface 2a which is swelled at the center corresponding to the first bending surface 1a and also extends in the X direction. On both sides of the second bending surface 2a, as shown in FIG.
The inclined surfaces 2b, 2b are formed as pressing portions that are inclined in the Y) coordinate. Further, at the center of the second bending surface 2a, flanges 2c and 2c as holding portions which extend in the Z direction while facing each other are provided in a protruding manner.

In such a bending die, the fixed die 1 is also used.
A rod-shaped metal rough material W ₀ is placed on the positioning recesses 1b, 1b. At this time, the rough material W ₀ is brought into contact with the positioning surface 1c. Then, the movable die 2 is moved in the Y direction to approach the fixed die 1. Thus, as shown in FIGS. 2A and 2B, the rough material W ₀ is bent by the first bending surface 1a and the second bending surface 2a. At this time, in this bending die, the inclined surfaces 2b, 2b press both ends of the rough material W _{0 in} the X direction while the fixed die 1 and the movable die 2 are relatively approaching each other. During this time, since the flanges 2c and 2c hold the central portion of the coarse material W ₀ , the inclined surfaces 2b and 2b prevent the entire coarse material W _{0 from} moving or rotating in the X direction. The bending fulcrum of the coarse material W ₀ is determined.

The crude material W ₁ thus obtained is shown in FIG.
As shown in (B), it has a portion bent in the Y direction, which is the approaching direction, and a portion bent in the X direction orthogonal to the approaching direction, as shown in FIG. Therefore, in FIG.
As shown in (A) and (B), when this rough shaped material W ₁ is placed on the waste land fixed mold 81, the rough shaped material W ₁ has its own weight bent in the X direction. Stable support with
Does not rotate. For this reason, since the rough-shaped material W ₁ is less likely to be displaced from the axis of the roughened shape forming surface 81a, when the stamping is performed in this state, the rough product has a low defective rate of wall thickness.

Therefore, in this bending mold, it is possible to effectively prevent the blank thickness of the rough product without increasing the diameter of the rough material W ₀ . For this reason, since burrs can be reduced, effects such as reduction of material cost and trimming cost and extension of life of a rough land mold can be exhibited by suppressing mold wear. According to the inventor's test, the diameter of the coarse material W ₀ is reduced by 10 to 15% as compared with the conventional one, and the amount of burrs is reduced to about 1/2 to 2.
Even if it was reduced to / 3, defective parts of rough products could be completely eliminated. (Embodiment 2) The bending mold of Embodiment 2 is also used for processing the upper control arm used for the suspension of the vehicle, and as shown in FIGS. 5 (A) and 5 (B), the first mold is used. And a movable die 4 as a second die which is provided so as to be able to come into contact with and separate from the fixed die 3.

In the fixed mold 3, holding bases 3a and 3a are provided upright at both ends in FIG. 1A, and arc-shaped first bending surfaces 3b and 3b are formed inside the holding bases 3a and 3a, respectively. Has been done. Further, on both sides of the first bent surfaces 3b, 3b, facing surfaces 3c as holding portions extending in the Z direction,
3c are formed respectively. On the other hand, in the movable die 4, a convex portion 4a is suspended at the center in the figure (A), and a tip end of the convex portion 4a extends in the X direction corresponding to the first bending surfaces 3b and 3b. Two bending surfaces 4b are formed. As shown in FIG. 2B, the second bending surface 4b is an inclined surface 4 as a pressing portion that is inclined at the (X, Y) coordinates.
have c.

In such a bending die, the fixed die 3
A rod-shaped metal rough material W ₀ is placed between the facing surfaces 3c and 3c. Then, the movable die 4 is moved in the Y direction to approach the fixed die 3. Thereby, as shown in FIGS. 6A and 6B, the rough material W ₀ is bent by the first bending surfaces 3b and 3b and the second bending surface 4b. At this time, in this bending die, while the fixed die 3 and the movable die 4 are relatively approaching each other,
The inclined surface 4c presses the central portion of the rough material W _{0 in} the X direction. During this time, since the facing surfaces 3c, 3c hold both ends of the rough material W ₀ , the inclined surface 4c prevents the entire rough material W _{0 from} moving or rotating in the X direction, and The bending fulcrum of the material W ₀ is determined.

The rough-shaped material W ₁ thus obtained is also the same as that of the first embodiment, and the same action and effect as those of the first embodiment can be obtained.

[0021]

As described above in detail, since the bending die of the present invention has the construction described in the claims, it is possible to remove the deficiency of the rough product without increasing the diameter of the rough material. It can be effectively prevented. Therefore, if this processing die is adopted, it is possible to surely prevent the thickness of the rough product from being thinned without increasing the diameter of the rough material in the first place, so that the burr can be reduced. Therefore, reduction of material cost and trimming cost,
By suppressing the die wear, it is possible to exert the effect of extending the life of the waste land type.

[Brief description of drawings]

FIG. 1 shows a bending mold of Example 1 before mold clamping,
(A) is a cross-sectional view, (B) is a cross-sectional view taken along the line bb of (A).

FIG. 2 shows the bending mold of Example 1 after mold clamping,
(A) is a cross-sectional view, (B) is a cross-sectional view taken along the line bb of (A).

FIG. 3 is a side view from the direction orthogonal to the bending direction of the crude material obtained by the bending die of Example 1.

4A and 4B show a rough profile and a rough mold obtained by the bending mold of Example 1, where FIG. 4A is a cross-sectional view and FIG. 4B is a plan view of a fixed mold.

FIG. 5 shows a bending mold of Example 2 before mold clamping,
(A) is a cross-sectional view, (B) is a cross-sectional view taken along the line bb of (A).

FIG. 6 shows a bending mold of Example 2 after mold clamping,
(A) is a cross-sectional view, (B) is a cross-sectional view taken along the line bb of (A).

FIG. 7 shows an upper control arm as a product, where (A) is a plan view and (B) is a side view.

8A is a plan view of a rod-shaped rough material, and FIG. 8B is a plan view of a rough shaped material after bending.

FIG. 9 shows a conventional bending die before clamping, (A)
Is a cross-sectional view and (B) is a cross-sectional view taken along the line bb of (A).

FIG. 10 shows a conventional bending mold after the mold is clamped,
(A) is a cross-sectional view, (B) is a cross-sectional view taken along the line bb of (A).

FIG. 11 is a side view from a direction orthogonal to the bending direction of the rough material obtained by the conventional bending die.

12A and 12B show a rough material and a rough land mold obtained by a conventional bending mold, FIG. 12A being a cross-sectional view and FIG. 12B being a plan view of a fixed mold.

[Explanation of symbols]

1, 3 ... First mold (fixed mold) 2, 4 ... Second mold (movable mold) 1a, 3b ... First bending surface 2a, 4b ... Second
Bending surface W ₀ ... Coarse material W ₁ ... Coarse shaped material 2 b, 4 c ... Pressing portion (inclined surface) 2 c, 3 c ... Holding portion (2 c ... Flange, 3 c ... Opposing surface)

Claims (1)

[Claims] 1. A first bending surface having a first bending surface, a first die for placing a rough material on the first bending surface, and a second bending surface having a shape corresponding to the first bending surface. , A second mold provided so as to be able to come into contact with and separate from the first mold, and the second mold includes the first mold.
In a bending die for relatively roughening a rough material by bending the rough material with the first bending surface and the second bending surface by relatively approaching the die, the first die and the second die At least one of the molds is formed with a pressing portion that presses a part of the rough material to the outside in the approaching direction during relative approach, and a holding portion that holds the other portion of the rough material. Bending die.