JP2002346662A - Die for press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die for press capable of enhancing accuracy and simply leveling strain by reducing the strain caused when being cooled. SOLUTION: A punch 1, along which an outer peripheral wall part 11 is provided with a gap part 14 formed between and inside the outer peripheral wall part 11 and is also provided with a gap part 14 formed between each other, has eight pillar parts 12. Consequently, the pillar parts 12 do not pull the outer peripheral wall part 11, because the outer peripheral wall parts 11 of the punch 1 and each pillar parts 12 are formed with the gap part 14 formed between each other. Therefore, strain is hardly caused on the punch 1, thereby enhancing the accuracy of the punch 1. Even when the punch 1 is distorted, the leveling force of an leveling press machine is not prevented by the pillar parts 12, so that the die can be easily leveled, because the outer peripheral wall part 11 and the eight pillar parts 12 are formed with the gap part 14 provided therebetween.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a press die for performing press molding.

[0002]

2. Description of the Related Art A conventional press die is mainly composed of a punch (male) and a die (female). When a deep drawing die is used, a blank holder is additionally provided. And three dies. These molds are
Storage or transportation is performed in a combined state due to setting to a press machine or the like. For this reason, it is necessary to keep these combined dies in such a weight that they can be lifted by a forklift, a crane, or the like, and in the conventional dies, unnecessary parts in the dies are cast out to reduce the weight. Was. As a general casting structure, as shown in FIG. 7, an outer peripheral wall 71 of a mold 7 and a grid-like rib 72 are integrally cast.
There is known a cast-out structure in which a portion surrounded by a rib 72 and a rib 72 is a cast-out portion 73. Since the bottom surface 72a of the rib 72 is flush with the bottom surface 71a of the outer peripheral wall 71, the rib 72 also plays a role of transmitting the force of the press machine to the molding surface 74 of the mold 7.

[0003]

However, in the portion where the outer peripheral wall 71 and the rib 72 in the conventional mold 7 intersect, the rib 72 is more than the outer peripheral wall 71 when the mold 7 is cooled after casting. By shrinking later,
The outer peripheral wall portion 71 is pulled, and as a result, the entire mold 7 tends to be warped and warped.

[0004] Further, even if the distortion of the mold 7 is to be corrected by a press machine for correcting the distortion, the conventional structure in which the outer peripheral wall portion 71 and the rib 72 are integrally cast is:
The rib 72 intersecting with the outer peripheral wall 71 acts so as to hinder the straightening force of the press machine. That is, in the conventional mold 7, the molding surface portion 74 is distorted and the rib 72 intersecting the outer peripheral wall portion 71 is also distorted.
In order to perform the correction, the rib 72 had to be corrected together. Therefore, in addition to the force for correcting the distortion of the molding surface portion 74, a force for correcting the distortion of the rib 72 is required, and it has been difficult to correct the distortion.

Accordingly, an object of the present invention is to improve the accuracy by reducing the distortion caused by cooling the mold, and to improve the accuracy.
An object of the present invention is to provide a press die that can easily correct the distortion of the die.

[0006]

Means for Solving the Problems The invention according to claim 1 of the present invention which has solved the above-mentioned problems is a press mold for performing press molding manufactured by casting, wherein An outer peripheral wall portion erected along the outer periphery of the molding surface portion side of the mold toward the back side of the molding surface portion, and a pillar erected inside the outer peripheral wall portion at the same height as the outer peripheral wall portion And a gap is formed between the outer peripheral wall portion and the pillar portion.

According to the first aspect of the present invention, since the gap is formed between the outer peripheral wall of the mold and the pillar, the outer peripheral wall of the mold does not intersect the pillar. Shrinkage due to cooling of the column does not distort the outer peripheral wall. Therefore, distortion is less likely to occur in the mold, and the accuracy of the mold can be improved. Further, even if the mold is distorted, since a gap is formed between the outer peripheral wall portion and the column portion, the column portion does not act so as to hinder the correcting force of the distortion correcting press machine. . That is, when the warped mold is corrected, a force for correcting the distortion of the rib is not required, so that the mold can be corrected with a small correction force, and the mold can be easily corrected. it can. And since a metal mold | die can be corrected with a small correction force, the press machine for distortion correction can be made small, and the cost concerning equipment can be reduced. Further, since the pillar portion has the same height as the outer peripheral wall portion, a force can be firmly applied to the molding surface portion at the time of straightening, and the accuracy of the molding surface portion can be improved.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a press die according to the present invention. This embodiment is, as shown in FIG. 1, applied to a punch 1 which is a male die for press.

The punch 1 has a rectangular outer peripheral shape, and has an outer peripheral wall 11 formed as an outer surface along the outer periphery, and the outer peripheral wall 1 inside the outer peripheral wall 11.
1 and a molding surface 13 formed on a surface of the punch 1 on the pressing direction side. Here, the material of the punch 1 is a zinc alloy (ZA).
S) is used.

The bottom surface 11a of the outer peripheral wall portion 11 is substantially flush with the bottom surfaces 12a, 12a,... Of the pillar portions 12, 12,.・ ・
-The structure is such that the force of the press machine is transmitted to the molding surface 13. The bottom surface 12a of the pillar 12 is substantially square. The pillar 12 and the outer peripheral wall 1
A gap 14 having substantially the same width is provided between each of the columns 1 and 12. That is,
Four rows of pillars 12, 12,... Are interposed between the outer peripheral wall sections 11 parallel to the short side direction of the punch 1 with a gap 14 between each other and with the outer peripheral wall section 11. It is arranged.
Further, between the outer peripheral wall portions 11 parallel to the long side direction of the punch 1, two rows of column portions 12, 12,. It is arranged in between.

As shown in FIG. 2 (a), when the punch 1 is distorted during casting, if the punch 1 is distorted, the punch 1 is heated, and then a distortion correcting press machine (not shown) is used. ) To perform the correction. This straightening method includes a method of performing a press in a state where a model die having the same shape as a female die and a punch 1 are combined, and a method in which a steel block is attached to a base of a press machine, and There is a method in which the punch 1 is pressed in a state where the punch 1 is placed with its molding surface side facing downward. Here, in the method using the block, the block has such a height that the convex portion of the molding surface of the punch 1 does not contact the base of the press machine. In addition, a flat surface portion is provided outside the molding surface portion of the punch 1.

According to such a straightening method, the pressing machine presses the bottom surface 11a of the outer peripheral wall portion 11 of the punch 1 and the bottom surfaces 12a, 12a,. As shown in FIG. 2B, the punch 1 is corrected so as to return to a normal state. At this time, the correction mold attached to the drive unit of the press machine descends from above the punch 1, and first, the correction mold comes into contact with the bottom surface 11 a of the outer peripheral wall portion 11 of the punch 1. The bottom surface 11a of the wall 11 is pressed. Next, the bottom surface 1 of the pillars 12, 12 in which the mold for correction is disposed with the outer peripheral wall 11 and the gap 14 interposed therebetween.
The bottom surfaces 12a, 12a are pressed by contacting the bottom surfaces 12a, 12a. Finally, the correction mold comes into contact with the bottom surfaces 12a, 12a of the pillar portions 12, 12 disposed inside the punch 1, and presses the bottom surfaces 12a, 12a. in this way,
Since the pressed outer peripheral wall portion 11 and the pillar portions 12, 12,... Are provided with the gaps 14 therebetween, the outer peripheral wall portion 1
1 and the respective column portions 12, 12,... Individually press the molding surface portion 13 independently. When the correction mold is located near the bottom dead center, the bottom surface 11a of the outer peripheral wall 11 of the punch 1 and the bottom surfaces 12a, 12 of the pillars 12, 12,.
are flush with each other, the force of the press machine is applied to the punch 1 until the correction mold is located at the bottom dead center.
The correction is carried out by firmly transmitting the entire molding surface portion 13.

Next, a method of manufacturing the punch 1 will be described. In the method for manufacturing the punch 1, as shown in FIG.
The main mold 2 and the core 3 are used as molds. The main mold 2 has an outer shape portion 2 in which the inside is hollowed out in a shape along the outer shape of the punch 1.
1 and a gate section 22 formed so as to communicate with the outer shape section 21. The core 3 has a gap forming portion 31 that forms a gap portion 14 provided between the outer peripheral wall portion 11 of the punch 1 and the eight pillar portions 12, 12,. Here, the main mold 2 and the core 3 are formed by solidifying sand for casting with a wooden mold.

The main mold 2 is placed on the ground, and the core 3 is mounted in the outer shape 21 thereof. At this time, the core 3
The support 4 is previously provided on the upper surfaces of the gap forming portions 31, 31,.
Are supported by bolts 5, 5,.... Further, support pillars 42, 42 are attached to both ends of the core support pillars 41, 41 with bolts 5, 5,. As shown in FIG. 4, the core 3 is attached to the main die 2 by such a support 4 in a floating state without contacting the outer shape portion 21 of the main die 2. The support 4 is fixed to the main mold 2 by bolts or the like (not shown).

After the core 3 is attached to the main mold 2, the molten metal is poured from the gate 22 of the main mold 2. And
The molten metal poured into the space between the main mold 2 and the core 3 is cooled. At this time, since the outer peripheral wall 11 of the punch 1 and the eight pillars 12, 12,... Are formed with the gaps 14 provided therebetween, the outer peripheral wall 11 and the pillars 12, 12,. 12,
... are separately cooled and contract respectively. After the punch 1 cast in the main mold 2 and the core 3 is cooled and completely solidified, the main mold 2 and the core 3
Is broken by vibration or the like, and the punch 1 is taken out.

As described above, according to the present embodiment, the following effects can be obtained. Outer peripheral wall 1 of punch 1
1 and each column part 12, 12,... Shrink separately,
The outer peripheral wall portion 11 is not pulled by the column portion 12. Therefore, distortion of the punch 1 is less likely to occur, and the accuracy of the punch 1 can be improved. Even when the punch 1 is distorted, the gaps 14 are provided between the outer peripheral wall 11 and the column 12 and between the column 12 and the column 12 of the punch 1. The two pillars 12, 12,... Do not act so as to hinder the straightening force of the press machine for straightening. That is, since it is only necessary to correct the distortion of the molding surface portion 13 of the punch 1, the punch 1 can be corrected with a small correcting force, and the correction of the punch 1 becomes easy. And since the punch 1 can be corrected with a small correction force,
It is possible to reduce the size of the press machine for correcting distortion, and it is possible to reduce the cost of equipment. Furthermore, the bottom surfaces 12a, 12a,.
Are flush with the bottom surfaces 11a, 11a,... Of the outer peripheral wall portion 11, so that a force can be firmly applied to the molding surface portion at the time of correction, and the accuracy of the molding surface portion can be improved.

As described above, the present invention is not limited to the above embodiment, but can be implemented in various forms. (1) In the present embodiment, the present invention is applied to a punch (male type), but the present invention is not limited to this. For example, the present invention may be applied to a die (female type). (2) In the present embodiment, the pillar portion is a square pillar having a square bottom surface, but the present invention is not limited to this.
This pillar may have any shape. For example, FIG.
As shown in FIG. 7, the column 6 may be a column having a bottom surface 6a that is circular. As described above, even when the column portion 6 is a column, the same operation and effect as in the present embodiment can be obtained. (3) In the present embodiment, the number of pillar portions is eight, but the present invention is not limited to this, and may be more or less than eight. In addition, the position of the pillar portion can be freely changed, for example, the pillar portion is arranged in a portion of the molding surface portion that particularly requires pressing, and as a result, the pillar portion is arranged irregularly. Is also good. Further, the size of the pillar portion can be freely changed, and by reducing the size of the pillar portion, it is possible to reduce the weight of the mold and reduce the material cost. (4) Further, the pillar portion of the present embodiment may be provided with a cast hole penetrating from the side surface thereof. By increasing the size of the cast hole, it is possible to reduce the weight of the mold and reduce the material cost. (5) In the present embodiment, the outer peripheral wall is formed to be the outer surface along the outer periphery of the mold. However, the present invention is not limited to this, and the outer peripheral wall may be formed on the outer periphery of the mold. Anything that is along may be used. For example, as shown in FIG. 6, in the structure of the die (female type) 8, the outer peripheral wall 81 is provided inside the outer peripheral end of the die 8, and the outside of the outer peripheral wall 81 is provided with a rib 82 similar to the conventional one. The provided structure may be a structure in which the pillar portions 83, 83,... Of the present invention are formed inside. (6) In the present embodiment, a zinc alloy (Z
Although AS) was used, the present invention is not limited to this. For example, materials such as spheroidal graphite cast iron, malleable cast iron, gray cast iron, and aluminum may be used.

[0018]

According to the first aspect of the present invention, since a gap is formed between the outer peripheral wall portion and the column portion of the mold, the mold is less likely to be distorted and the accuracy of the mold is reduced. And the mold can be easily corrected.

[Brief description of the drawings]

FIG. 1 is a perspective view of a press die to which the present invention is applied.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG.
FIG. 4B is a sectional view (b) showing a state in which the distorted press mold is corrected.

FIG. 3 is a perspective view showing a main mold and a core which are molds of the press die of FIG. 1;

FIG. 4 is a cross-sectional view along the line BB of FIG. 3;

FIG. 5 is a perspective view showing another embodiment of a press die to which the present invention is applied.

FIG. 6 is a perspective view showing another embodiment of a press die to which the present invention is applied.

FIG. 7 is a perspective view showing a conventional press die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Punch (die for press) 11 Outer peripheral wall part 12 Column part 14 Void part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Sumio Ichikawa 1-33 Unuma Asahimachi, Kakamigahara-shi, Gifu F-term (reference) Ichikawa Kinzoku Co., Ltd. 4E050 JA01 JB04 JC04 JD03

Claims (1)

[Claims] 1. A press die for press-molding manufactured by casting, and is erected along the outer periphery of the press-mold side of the press die toward the back side of the molding surface. An outer peripheral wall portion, and a pillar portion erected at the same height as the outer peripheral wall portion inside the outer peripheral wall portion, and a gap is formed between the outer peripheral wall portion and the pillar portion. A press die.