JP2002224753A - Press mold equipment - Google Patents

Abstract

(57) [Problem] To provide a press die device capable of forming a molded product with little springback or warpage. A punch (4) for forming a plate-shaped work (6) between a die (2) and a movable punch (4a) near a flange (4d).
And the fixed punch 4b, and the flange 4d protruding from the lower part of the movable punch 4a is slightly larger than the outer dimension of the movable punch 4a. When the workpiece 6 is formed, the work 6 is broken. Can be suppressed,
There is no distortion that causes springback in the molded product, so that a molded product with less springback can be obtained. In addition, by dividing the punch 4 into a movable punch 4a and a fixed punch 4b, the work 6 can be formed. Since the work 6 can be prevented from being strongly rubbed by the shoulder 2b of the die 2 during molding, a molded product with less warpage can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press die apparatus for bending a plate-shaped work.

[0002]

2. Description of the Related Art Conventionally, a mold apparatus of this kind is disclosed in, for example, Japanese Utility Model Laid-Open Publication No.
No. 30 is known.

[0003] As shown in Fig. 19, a mold apparatus of a conventional general hat cross-sectional shape forming method includes a die b attached to a slide a of a press, and a bolster c installed below the slide a. The work e is formed by a fixed punch d and is formed as follows.

That is, a workpiece e to be formed is punched d.
When the operation of the press is started by placing the work on the die, the pad f provided at the center of the die b is lowered, and the work e is fixed to the punch d as shown in FIG.

Thereafter, as the slide a is lowered, the die b is lowered, and both ends of the work e are bent downward by the shoulder g of the die b as shown in FIG.
Are in contact with the flange portion i of the punch d.

Thereafter, when the slide a further descends, the punch d enters the cavity k of the die b as shown in FIG. 21, and the work e is formed between the die b and the punch d. As shown in the figure, when the bottom dead center is reached, the forming of the work e is completed.

In the mold apparatus disclosed in Japanese Patent Application Laid-Open No. 61-82930, a work portion located far away from a shoulder of a bending die is pressed by a first operating point provided on a movable die, and the work is previously spring-backed. Then, the work is bent at a predetermined angle between the bending die and the movable die.

[0008]

However, in the case where the outer dimensions of the flange portion are sufficiently larger than the outer dimensions of the punch, as in the above-described mold apparatus, both ends h of the work e are connected to the flanges of the punch d. When the workpiece e is formed in a state in which the workpiece e is in contact with the portion i, the workpiece e is broken by the shoulder g of the die b as shown in FIG. However, the distortion causes a springback in the molded product as shown by a solid line in FIG. 23, and there is a problem that a molded product B having a predetermined shape as shown by a virtual line in FIG. 23 cannot be obtained. .

In the case where distortion occurs on the side wall of the molded product B, conventionally, the distortion is corrected by pressing the correction mold j from the lateral direction of the molded product B as shown in FIG. Although a molded product B having a predetermined shape as shown by the solid line is obtained, this method requires a large number of man-hours for the correction work, so that there is a problem that the molded product B is expensive.

On the other hand, as disclosed in Japanese Utility Model Laid-Open Publication No. 64-33313, a work is formed in advance in a direction opposite to the springback, and then the work is bent at a predetermined angle between a bending die and a movable die. When the workpiece is bent at a predetermined angle, the workpiece is strongly rubbed by the die, so that the side wall of the obtained molded product is warped as shown by the solid line in FIG. There is a problem that a molded product B having a predetermined shape as shown by a virtual line cannot be obtained.

Further, if the molding is repeated continuously, there is another problem that seizure occurs on the friction surface between the work and the die, causing galling.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and a press die in which springback and warpage of a molded article are reduced by suppressing breakage and friction generated during molding. It is intended to provide a device.

[0013]

According to a first aspect of the present invention, there is provided a press die apparatus comprising: a die having a cavity; and a punch having a flange formed on an outer periphery of a lower portion. A press die apparatus for forming a work, wherein the punch is divided into a movable punch and a fixed punch in the vicinity of the flange, and a flange protruding from a lower portion of the movable punch is provided with an outer dimension of the movable punch. It is slightly larger.

According to the above configuration, it is possible to prevent the work from being broken when the work is formed.
Since the distortion that causes springback does not occur on the side wall of the molded product, high precision molding with less springback is possible, and the punch is divided into a movable punch and a fixed punch. Since the end of the work does not come into contact with the fixed punch when the work is formed, it is possible to prevent the work from being strongly rubbed by the shoulder of the die, which may cause the molded product to be seized. As a result, a molded article of good quality can be obtained.

According to a second aspect of the present invention, there is provided a press die apparatus in which a work is fixed between a movable punch and a pad when the work is formed.

According to the above configuration, the curl phenomenon can be suppressed from occurring in the work, and the work does not move when the work is formed, so that the occurrence of defective products can be prevented. .

According to a third aspect of the present invention, there is provided a press die apparatus in which a movable punch is urged in a direction away from a fixed punch by an urging means.

According to the above configuration, since the movable punch can be reliably separated from the fixed punch, a stable forming operation can be performed.

According to a fourth aspect of the present invention, there is provided a press die apparatus in which a die and a movable punch are provided with a forming section for forming a bead, a jokkle, or the like.

According to the above configuration, beads or jocks can be simultaneously formed on the flange of the molded product at the time of forming the work, so that the number of forming steps can be reduced as compared with the case where beads or jocks are formed in a separate step. Can be achieved.

According to a fifth aspect of the present invention, there is provided a press die apparatus for forming a plate-shaped work by a die having a cavity and a punch having a flange projecting from a lower outer periphery. A mold device, wherein the die is divided into a plurality, and provided so as to be movable in the contact and separation directions,
A cam member for moving the die toward the punch from obliquely above the punch is provided beside the fixed punch.

According to the above configuration, since the forming is completed with the work hardly rubbed by the shoulder of the die, even when the forming is continuously repeated, the seizure does not occur on the friction surface between the work and the die. A molded article of good quality without galling or the like can be obtained.

According to a sixth aspect of the present invention, there is provided a press die apparatus in which a work is fixed between a punch and a pad when the work is formed.

According to the above configuration, the curl phenomenon can be suppressed from occurring in the work, and the work does not move when the work is formed, so that the occurrence of defective products can be prevented. .

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings shown in FIGS.

FIG. 1 shows a die apparatus mounted on a press, which comprises a die 2 mounted on the lower surface of a slide 1 and a punch 4 mounted on a bolster 3.

A cavity 2 having an open lower surface is provided in the die 2.
a is formed, and the pad 5 is accommodated in the cavity 2a.

The pad 5 can be moved up and down by a driving means (not shown) so that the work 6 placed on the movable punch 4a of the punch 4 can be fixed.

The punch 4 includes a movable punch 4a and a fixed punch 4.
b, the movable punch 4a enters the cavity 2a of the die 2 from the front end side, thereby forming the work 6 into a predetermined shape between the inner peripheral surface of the cavity 2a and the outer peripheral surface of the movable punch 4a. I can do it.

The tip side shoulder 4c of the movable punch 4a is chamfered in a small arc shape, and a work 6
In order to prevent the work 6 from being broken when forming the workpiece, a flange portion 4d slightly larger than the outer dimension of the movable punch 4a is protruded, and the continuous portion 4e of the flange portion 4d and the movable punch 4a also has a small arc shape. Is formed.

The fixed punch 4b of the punch 4 has a concave portion 4f whose upper surface is open, and the bottom surface is fixed on the bolster 3.

The inner dimension of the recess 4f is slightly larger than the outer dimension of the flange 4d formed on the outer periphery of the lower part of the movable punch 4a, and the flange 4d fits more closely in the recess 4f. Can be combined.

From the bottom of the recess 4f, a plurality of guide rods 4
The movable punch 4a is vertically slidably fitted into the guide rods 4g, and each guide rod 4g has a compression spring or a cushion for urging the movable punch 4a upward. A biasing means 7 composed of a pin is fitted.

The biasing means 7 is set to have a spring constant larger than the forming load of the work 6 and smaller than the forming ability of the press, so that the movable punch 4a does not descend while the work 6 is being formed. Near the bottom dead center, the movable punch 4a starts to descend.

Next, the operation of the above-configured mold apparatus will be described.

As shown in FIG. 1, when the work 6 to be formed is placed on the movable punch 4a and the operation of the press is started, first, the gap between the pad 5 provided in the die 2 and the movable punch 4a is formed. The work 6 is fixed.

Thereafter, as the slide 1 is lowered, the die 2 is lowered, and the forming of the work 6 is started between the shoulder 2b of the die 2 and the shoulder 4c of the movable punch 4a as shown by a virtual line in FIG. And the upper end of the movable punch 4a is
As the workpiece 6 enters the cavity 2a, both ends of the work 6 are bent as shown by a solid line in FIG. 2 so that both ends 6a abut against a flange portion 4d protruding from a lower outer periphery of the movable punch 4a. Is done.

Since the flange portion 4d of the movable punch 4a is formed to be slightly larger than the outer dimension of the movable punch 4a in advance, the angle of the bent portion 6b of the work 6 becomes almost a right angle. Even if the movable punch 4a is lowered into the cavity 2a of the die 2 as shown in FIG. 3, the work 6 can be prevented from being broken. Almost no distortion occurs.

When almost all of the movable punch 4a enters the cavity 2a of the die 2 and the shoulder 2b of the die 2 reaches the continuous portion 4e of the movable punch 4a, the flange 6c is attached to both ends 6a of the work 6. When the slide 1 reaches the vicinity of the bottom dead center, the urging means 7 starts buckling, and the flange 4d of the movable punch 4a is inserted into the recess 4f of the fixed die 4b. Slide 1 as shown in 4
Has reached the bottom dead center, the forming of the work 6 is completed.

Thereafter, while the die 2 starts to rise with the rise of the slide 1 and reaches the top dead center, the molded article A adhered to the die 2 or the movable punch 4a is removed by knockout means (not shown). And is carried out of the mold.

As described above, the outer size of the flange portion 4d of the movable punch 4a is reduced to prevent the work 6 from being broken when the work 6 is formed. The distortion which causes the spring back does not occur on the side wall portion of the substrate, thereby enabling high-precision molding with little spring back.

The punch 4 is divided into a movable punch 4a and a fixed punch 4b.
Is biased in a direction away from the fixed punch 4b,
When the work 6 is formed, the end 6b of the work 6 does not come into contact with the fixed punch 4b, so that the work 6 can be prevented from being rubbed by the shoulder 2b of the die 2, whereby the molded product A It becomes possible to prevent the occurrence of galling or the like.

FIGS. 5 and 6 show that the concave portion 2c is formed on the lower surface of the die 2 and the convex portion 4i is formed on the upper surface of the fixed punch 4b in advance, and the bead 6d or the jokkle is formed on the flange 6c of the molded product A at the same time. This shows a modified example of the mold apparatus configured to perform beading or jogging at the same time on the flange 6c of the molded product A at the time of molding the work 6, so that the effect of reducing the number of molding steps can be obtained. .

FIGS. 7 to 12 show actual examples of the molded article A molded by the above-mentioned mold apparatus, and can be applied to molded articles A having various shapes.

FIGS. 13 to 18 show another modified example of the mold apparatus, which will be described below.

The same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the modification shown in FIGS. 13 to 17, the die 2 is divided into a plurality of parts and mounted on the slide 1 so as to be movable in the contact and separation directions, and the punch 4 is fixed on the bolster 3 so that the side of the punch 4 A wedge-shaped cam member 10 is provided.

The die 2 movably attached to the slide 1 is provided with a shoulder 2b for forming the work 6 and an inclined surface 2d which comes into sliding contact with a cam surface 10a formed on the cam member 10.

The cam member 10 has a surface facing the punch 4
It has cam surfaces 10a which incline gradually toward the punch 4 side, and these cam surfaces 10a are configured to move the dies 2 in directions approaching each other.

Next, the operation of the above-configured mold apparatus will be described. The work 6 to be molded is placed on the punch 4, and the work 6 is slid while the work 6 is fixed by the pad 5 as shown in FIG. 1 is lowered to start forming the work 6.

When the shoulder 2b of the die 2 lowered together with the slide 1 comes into contact with the upper surface of the work 6 as shown in FIG. 14, the inclined surface 2d of the die 2 also comes into contact with the cam surface 10a of the cam member 10. Thereafter, as the slide 1 is lowered, the dies 4 are moved in a direction approaching each other by the cam surface 10a of the cam member 10, whereby the dies 2 are moved in FIG.
As shown by the arrow A, the work 6 is pressed obliquely downward from above the punch 4 to start forming the work 6.

Then, as the slide 1 further descends, both ends 6a of the work 6 are moved to the flanges 4d of the punch 4.
As shown in FIG. 16, the workpiece 2 is pressed obliquely downward from obliquely upward by the shoulder 2b of each die 2 in this state, and the forming of the work 6 proceeds.

When the slide 1 reaches the bottom dead center shown in FIG. 17, the molding of the work 6 is completed. According to this mold apparatus, the work 6 is almost rubbed by the shoulder 2b of the die 2. Therefore, there is almost no risk of seizure due to the friction between the work 6 and the die 2 even if the molding is continuously repeated, so that a molded product A of good quality without galling can be obtained, as shown in FIG. By providing the dimensional accuracy margin 4j in advance on the punch 4 as described above, the straightening work can be performed without using the straightening die, so that the man-hour required for the forming work is smaller than the conventional case where the straightening work is performed in another process. Can be greatly reduced.

[0054]

As described in detail above, according to the present invention, a punch for forming a plate-shaped work between a die and a die is divided into a movable punch and a fixed punch in the vicinity of a flange portion, and the punch is formed below the movable punch. Since the protruding flange is slightly larger than the outer dimension of the movable punch, it is possible to prevent the work from being broken when forming the work.
There is no distortion that causes springback in the molded product, which enables high-precision molding with little springback. In addition, the work is formed by dividing the punch into a movable punch and a fixed punch. Since the end of the work does not come into contact with the fixed punch when performing the work, it is possible to suppress the work from being strongly rubbed by the shoulders of the die, thereby preventing the molded product from galling. Good quality molded products can be obtained.

Further, since the movable punch is urged by the urging means in a direction away from the fixed punch, the movable punch can be reliably separated from the fixed punch, so that a stable forming operation can be performed. In addition, by providing the die and movable punch with a forming part for forming beads and jocks, it is possible to simultaneously form beads or jocks on the flange of the molded product at the time of forming the work, so that the bead is formed in a separate process. Alternatively, the number of molding steps can be reduced as compared with the case of molding a jokkle or the like.

Further, the die is divided into a plurality of parts and provided so as to be movable in the contact and separation directions, and a cam member for moving the die toward the punch from obliquely above the punch is provided beside the fixed punch. For example, since the workpiece is hardly rubbed on the shoulder of the die and the molding is completed, even if the molding is repeated continuously, there is no seizure on the friction surface between the workpiece and the die, so there is no galling etc. Good quality molded products can be obtained.

[Brief description of the drawings]

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

FIG. 2 is an operation explanatory view when a work is formed by a press die apparatus according to an embodiment of the present invention.

FIG. 3 is an operation explanatory diagram when a work is formed by a press die apparatus according to the embodiment of the present invention.

FIG. 4 is an operation explanatory view when a work is formed by the press die apparatus according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a modification of the press die apparatus according to the embodiment of the present invention.

FIG. 6 is an operation explanatory view showing a modification of the press die apparatus according to the embodiment of the present invention.

FIG. 7 is a perspective view of a molded product formed by the press die apparatus according to the embodiment of the present invention.

FIG. 8 is a perspective view of a molded product formed by the press die apparatus according to the embodiment of the present invention.

FIG. 9 is a perspective view of a molded product formed by the press die apparatus according to the embodiment of the present invention.

FIG. 10 is a perspective view of a molded product formed by a press die apparatus according to the embodiment of the present invention.

FIG. 11 is a perspective view of a molded product formed by the press die apparatus according to the embodiment of the present invention.

FIG. 12 is a perspective view of a molded product formed by the press die apparatus according to the embodiment of the present invention.

FIG. 13 is a cross-sectional view showing a modification of the press die apparatus according to the embodiment of the present invention.

FIG. 14 is an operation explanatory view showing a modification of the press die apparatus according to the embodiment of the present invention.

FIG. 15 is an operation explanatory view showing a modification of the press die apparatus according to the embodiment of the present invention.

FIG. 16 is an operation explanatory view showing a modification of the press die apparatus according to the embodiment of the present invention.

FIG. 17 is an operation explanatory view showing a modification of the press die apparatus according to the embodiment of the present invention.

FIG. 18 is an operation explanatory view showing a modification of the press die apparatus according to the embodiment of the present invention.

FIG. 19 is a cross-sectional view showing a conventional press die apparatus.

FIG. 20 is an operation explanatory view when a work is formed by a conventional press die apparatus.

FIG. 21 is an explanatory diagram of an operation when a work is formed by a conventional press die apparatus.

FIG. 22 is an operation explanatory diagram when a work is formed by a conventional press die apparatus.

FIG. 23 is a cross-sectional view of a molded product formed by a conventional press die apparatus. FIG.

FIG. 24 is a cross-sectional view of a molded product formed by a conventional press die apparatus. FIG.

FIG. 25 is an explanatory diagram for correcting a molded product formed by a conventional press die apparatus.

FIG. 26 is a sectional view of a corrected molded product.

[Explanation of symbols]

 Reference Signs List 2 die 2a cavity 4 punch 4a movable punch 4b fixed punch 4d flange portion 5 pad 6 work 6d bead 7 biasing means 10 cam member

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Koji Obuchi, 191-1 Aobacho, Fuji-shi, Shizuoka Prefecture Inside Unipres Co., Ltd. (72) Kenichi Watanabe 1 Kanazawacho, Kakogawa-shi, Hyogo Prefecture Kobe Steel Works Kakogawa Corporation Inside the steelworks (72) Inventor Masaaki Miura 1 Kanazawa-cho, Kakogawa-shi, Hyogo Prefecture Kobe Steel Works Kakogawa Works F-term (reference) 4E063 AA01 CA06 DA01 DA06 DA08 JA01

Claims (6)

[Claims] 1. A press die apparatus for forming a plate-shaped work by using a die having a cavity and a punch having a flange protruding from a lower periphery thereof, wherein the punch is formed near the flange. A press die apparatus which is divided into a movable punch and a fixed punch, and wherein a flange portion projecting from a lower portion of the movable punch is slightly larger than an outer dimension of the movable punch. 2. The press die apparatus according to claim 1, wherein the work is fixed between the movable punch and the pad when the work is formed. 3. The press die apparatus according to claim 1, wherein the movable punch is urged by an urging means in a direction away from the fixed punch. 4. The press die apparatus according to claim 1, wherein said die and said movable punch are provided with a forming part for forming a bead, a jockey or the like. 5. A press die apparatus for forming a plate-like work by using a die having a cavity and a punch having a flange portion projecting from the lower periphery, wherein the die is divided into a plurality of pieces, and A press die apparatus, wherein a cam member is provided movably in a separating direction, and a cam member for moving the die toward the punch from obliquely above the punch is provided on a side of the fixed punch. . 6. The press die apparatus according to claim 5, wherein the work is fixed between the punch and the pad when the work is formed.