JP2000176557A - Method for deep draw forming and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit deep draw forming having sufficiently secured thickness. SOLUTION: An original product 3 formed in a shape of a hanging bell is placed on a punch 6 provided to a lower die and on a ring 5 around the punch, and a shoulder part 31 of the original product 3 is pressed by a contact surface 71 of an upper die 7 to deform it to an opposed side in the direction of bulging-out. By making the punch 6 advance into a recessed part 72 of the upper die 7, the original product 3 is formed into a product of a shape of deep draw forming following the outer circumference of top part of the punch 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deep drawing method and a deep drawing machine for performing the method.

[0002]

2. Description of the Related Art As shown in FIG. 8, in order to manufacture a companion flange 9 composed of a cylindrical portion 91 having a serration 93 on the inner periphery and a mounting flange portion 92, deep drawing with a sufficient thickness is performed. Was difficult to do,
Conventionally, it is manufactured by cutting.

[0003]

However, the cutting requires a long time for the machining, so that the production efficiency is low and the material is wasteful.

Accordingly, the present invention has been made to solve the above problems, and has as its object to provide a deep drawing method capable of performing deep drawing while ensuring a sufficient thickness, and a deep drawing forming machine for performing the method. I do.

[0005]

In order to achieve the above object, in the deep drawing method according to the first aspect of the present invention, an original product (3) formed into a bell shape is placed on one press mold (10). Place
The other press die (7) presses the shoulder of the original product (3) to deform it in the direction opposite to the bulging direction, and the original product (3) is pressed against the other press die (7). Space (72)
The original product (3) is formed into a deep drawn product. According to such a deep drawing method,
Deep drawing can be performed while maintaining the thickness of the original product, thereby improving production efficiency and preventing material waste.

In the deep drawing method according to the second aspect of the present invention, the original product (3) formed into a bell shape is formed on a punch (6) provided in one press die and a ring (5) around the punch (6). And press the shoulder (31) of the original product (3) with the other press mold (7) to deform it in the direction opposite to the bulging direction, and press the punch (6) with the other press. The original product (3) is advanced into the recess (72) of the mold (7) to form a deep drawn product (4) following the outer periphery of the tip of the punch (6). According to such a deep drawing method, unnecessary deformation of the original product due to the presence of the punch can be minimized in addition to the operation and effect of the first invention.

The deep drawing method of the present invention can be carried out by the following deep drawing machine. That is, in the deep drawing forming machine of the third invention, a supporting portion (51) for supporting the opening edge (32) of the original product (3) formed in a bell shape is provided on one press mold (10), Original product (3) shoulder (3
The other press die (7) is provided with a contact surface (71) for pressing and deforming in the direction opposite to the bulging direction and a space (72) for receiving the deformed original product (3). is there.

The deep drawing machine according to the fourth aspect of the present invention provides a ring (5) having a support portion (51) for supporting an opening edge (32) of an original product (3) formed in a bell shape, and a ring (5). A punch (6), which is located at the center of (5) so as to be able to advance and protrudes from the ring (5), is provided on one of the press dies (10), and a shoulder (3) of the original product (3) is provided.
The other press die (7) is provided with a contact surface (71) for pressing and deforming in the direction opposite to the bulging direction and a concave portion (72) for receiving the punch (6) to be advanced. is there.

[0009] By elastically supporting the back of the punch (6), its advance operation can be easily performed. Also, by elastically supporting the back of the ring (5), the molded product is easily detached from the punch.

[0010] The reference numerals in parentheses indicate the correspondence with specific means described in the embodiment described later.

[0011]

FIG. 1 shows a vertical cross section of a companion flange manufactured by applying the molding method of the present invention, and FIG. 2 shows a plan view of the same viewed from below. The companion flange 1 has a stepped cylindrical portion 11 having a different diameter.
And a mounting flange portion 12 which is formed in a substantially rectangular shape at the base end of the cylindrical portion 11. A serration 13 is formed on the inner periphery of the cylindrical portion 11, and the mounting flange portion 1 is formed.
2 has four mounting holes 121 at four corners.

The process of forming the companion flange 1 will be described below with reference to FIG. In FIG. 3, first draw forming is performed by a press. This means that the flat plate 2 shown in FIG.
It is formed into a bell-shaped original product 3 having a shoulder 31 bulging outward and opening downward. Subsequent to the first drawing, a second drawing is performed, which is the deep drawing of the present invention. In this deep drawing, a flat cylindrical upper half 41 having no shoulder bulging outward as shown in FIG. 4 (C) is obtained from the original product 3 in a bell shape shown in FIG. 4 (B). And a product 4 consisting of a lower half 42 extending downward in a skirt shape. The press die used for the second drawing and the details of the forming process are shown in FIGS.

In FIG. 6, a shoe 101 is attached to a lower mold 10.
Is formed, and a ring 5 and a punch 6 are provided at the center of the ring 5 in the shoe 101. The ring 5 and the punch 6 are elastically supported behind and can move up and down in the shoe 101. A support groove 51 having a triangular cross section is formed on the upper surface of the ring 5 so as to surround the center punch 6, and the upper surface of the ring 5 rises linearly from the support groove 51 toward the center to form a receiving surface 52. ing. The punch 6 has a cylindrical shape whose tip is smoothly chamfered, and the tip protrudes upward from the upper end of the receiving surface 52. As shown in FIG. 6A, the bell-shaped original product 3 has the opening periphery 32 located in the support groove 51 of the ring 5, and
The top 33 is placed so that the inner surface thereof is in contact with the tip surface of the punch 6.

In this state, as shown in FIG. 6 (B), the upper die 7 is lowered from above, and the contact surface 7 which is linearly inclined is lowered.
When 1 abuts on the shoulder 31 of the original product 3 in the shape of a bell, the punch 6 and the ring 5 descend against the elastic force behind them, and their back surfaces reach the descending end where they abut the bottom surface of the shoe 101. .
The inclination angle of the contact surface 71 is equal to the receiving surface 52 of the ring 5.
And the same inclination angle. Even after the ring 5 and the punch 6 reach the lower end, the upper die 7 continues to lower further, and the shoulder 31 of the original product 3 is pressed and deformed by the contact surface 71 in the direction opposite to the bulging direction.

When the upper die 7 is further lowered while the shoulder 31 of the original product 3 is pressed and deformed, the load applied to the tip of the punch 6 is reduced. As a result, as shown in FIG. The punch 6 starts to enter the recess 72 of the upper die 7 due to the elastic force of the punch 6. When the upper mold 7 is further lowered, FIG.
As shown in the figure, the punch 6 largely enters into the recess 72 of the upper die 7, whereby the upper half of the original product 3 is formed into a flat cylindrical shape along the outer periphery of the punch 6, and at the same time, the lower half Is sandwiched between the contact surface 71 of the upper die 7 and the receiving surface 52 of the ring 5 and is formed into a hem shape, thereby obtaining the product 4 shown in FIG. The recess 72 of the upper die 7 is similar to the shape of the tip of the punch 6, and its cross-sectional shape is almost the same as the product 4.
Is increased by the thickness of the plate. When the upper mold 7 rises,
As a result, the ring 5 returns to the upper original position (see FIG. 6A) as indicated by the chain line in FIG. 7B, whereby the product 4 is pushed up and detached from the punch 6 to facilitate its removal. become.

As shown in FIG. 5, the product 4 that has been subjected to the second drawing is subjected to a third drawing using another press die to reduce the length and diameter of the upper half portion 41 as shown in FIG. Thereafter, the top is opened by punching (a chain line in FIG. 5), and after performing annealing and bonding,
Molding is performed. The first molding is performed by another press mold, as shown in FIG.
A product 8 having a cylindrical tubular portion 81 having a stepped and different diameter as shown in (B) and a mounting flange portion 82 projecting horizontally from the lower end of the tubular portion 81 is formed. After the first molding, as shown in FIG. 3, the outer shape of the mounting flange portion 82 is cut out in a substantially rectangular shape. Thereafter, the second molding is performed to form the same outer shape as the companion flange 1 as the final product shown in FIG.

After the second molding, a mounting hole 121 is punched out of the mounting flange portion 12 of the final product 1 (FIG. 1), and the serration 13 is molded and chamfered at the same time. Further, the top of the product 1 is flat-ground and washed, and then inspected and corrected to obtain a finished product.

As described above, since the deep drawing method of the present invention is applied to the second drawing, the companion flange 1 having a necessary thickness can be manufactured almost only by press forming, and the manufacturing time is greatly reduced. Shortening and wasteful consumption of materials can be avoided.

In the above embodiment, providing a punch on the lower mold is advantageous in that the original product does not undergo unnecessary deformation during molding. Further, the punch may be advanced by hydraulic pressure or the like instead of advanced by the elastic force.

[0020]

As described above, according to the deep drawing method of the present invention, it is possible to perform deep drawing while ensuring a sufficient thickness.
Increased production efficiency and material savings are realized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a companion flange.

FIG. 2 is a plan view of a companion flange as viewed from below.

FIG. 3 is a block diagram showing a manufacturing process of a companion flange.

FIG. 4 is a sectional view showing a manufacturing process of a companion flange.

FIG. 5 is a sectional view showing a manufacturing process of a companion flange.

FIG. 6 is a sectional view showing a deep drawing forming step.

FIG. 7 is a sectional view showing a deep drawing forming step.

FIG. 8 is a longitudinal sectional view of a conventional companion flange.

[Explanation of symbols]

3 ... Original product, 32 ... Opening edge, 4 ... Product, 5 ... Ring, 6
... punch, 7 ... upper mold, 71 ... contact surface, 72 ... recess, 10
... lower mold.

Claims (5)

[Claims] 1. An original product formed into a bell shape is placed on one press die, and the other press die presses the shoulder of the original product to the side opposite to the bulging direction. A deep drawing method, which comprises deforming the raw material into the space of the other press die and forming the raw product into a deep drawn product. 2. An original product formed into a bell shape is placed on a punch provided in one press die and a ring around the punch, and a shoulder of the original product is pressed by the other press die. And deformed in the direction opposite to the bulging direction, and the punch is advanced into the recess of the other press mold to form the original product into a deep drawing product following the outer periphery of the tip of the punch. A deep drawing method. 3. A supporting portion for supporting an opening edge of a bell-shaped original product is provided on one of the press dies, and a shoulder of the original product is pressed to be deformed in a direction opposite to the bulging direction. A deep drawing forming machine, wherein a contact surface and a space for receiving the deformed original product are provided in the other press die. 4. A press having a ring having a support portion for supporting an opening edge of an original product formed in a bell shape and a punch protruding from the ring and positioned at a center of the ring so as to be able to advance. And a pressing surface for pressing the shoulder of the original product and deforming the same in the direction opposite to the bulging direction, and a recess for receiving the punch to be advanced are provided in the other press die. Deep drawing machine. 5. The deep drawing machine according to claim 4, wherein the ring and the back of the punch are elastically supported.