JPH05317968A - Twist straightening device for press formed article - Google Patents

Abstract

PURPOSE:To provide the device which can easily straighten the twist of a formed article when the twist is generated in the formed article by press forming molds. CONSTITUTION:This twist straightening device is provided with plural pieces of adjusting bolts 10 screwed and fixed adjustably in the projection height downward from the rear surface of an upper mold shoe 1 and plural pieces of adjusting bolts 14 screwed and fixed adjustably in the projection height upward from the front surface of a lower mold shoe 4 and is constituted to eliminate the twist of a work 7 disposed between product guides 21 and 22 erected and fixed on the lower mold shoe 4 by abutting the bolt heads 10a, 14a of the respective adjusting bolts 10, 14 against the work 7 from above and below the work 7 according to the approach of the upper mold shoe 1 and the lower mold shoe 4 to each other. A positioning block 19 for determining the distance in the height direction between the upper mold shoe 1 and the lower mold shoe 4 is inserted between guide posts 17 and 18 fixed to both shoes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straightening device capable of eliminating "twisting" that tends to occur in a molded product by a simple adjusting mechanism when press-molding a high-tensile steel plate or the like using a molding die. Is.

[0002]

2. Description of the Related Art Generally, a structure shown in the schematic view of FIG. 5 is used as a press molding die. That is, the upper die 3 is attached to the upper die plate 2 supported on the lower surface of the upper shoe 1.
Is fixed, and the lower die punch 6 is fixed to the lower die punch plate 5 supported on the upper surface of the other lower die shoe 4. Then, a work 7 made of a high-tensile steel plate is inserted between the upper die 3 and the lower punch 6 to carry out a desired pressing operation.

[0003]

However, in the case of such a conventional molding die, there is a slight "twist" in the molded product.
However, there is a problem that it may take a lot of time and processing man-hours to correct such a twist.

That is, when the above-mentioned twist occurs in a molded product, a large amount of basic data relating to the twisted numerical value is collected, and a dimensional correction value at the time of manufacturing the mold itself is calculated from these data, and a new value is calculated. It is necessary to manufacture a simple mold, which requires a long processing time, which results in a large cost.

Therefore, the present invention solves the problems of the conventional press-molding dies, and provides a device that can easily correct the twist when the twist occurs in the molded product. The purpose is to do.

[0006]

In order to achieve the above-mentioned object, the present invention is provided on the lower surface of the upper die and has a plurality of adjustments in which the downward protruding length is screwed and fixed. The upper die shoe and the lower die shoe are provided with a bolt and a plurality of adjusting bolts provided on the upper surface of the lower die shoe and screwed and fixed so that the protruding length upward can be adjusted. Along with this, a twist straightening device for a press-formed product, in which the bolt heads of the adjusting bolts are abutted from above and below a work disposed between the product guides that are vertically installed on the lower die shoe to eliminate the twist of the work. It has a structure of. Further, a positioning block that determines the heightwise distance between the shoes is inserted between the guide posts fixed to the upper shoe and the lower shoe.

[0007]

According to such a twist straightening device, the distance in the height direction between the upper die shoe and the lower die shoe corresponding to the work is determined in advance by the guide post and the positioning block, and the upper die of the press forming device is After a work made of a high-tensile steel plate is inserted between the lower die punch and a press work of a predetermined shape is performed, the work is placed between the product guides. Then, as the upper die shoe and the lower die shoe approach each other, the bolt head of the adjusting bolt screwed and fixed to the lower surface of the upper die shoe and the bolt head of the adjusting bolt screwed and fixed to the upper surface of the lower die shoe. And are in contact with each other from the upper surface and the lower surface of the press-formed work. The "twist" generated in the molded product by the pressing force at the time of this collision is corrected, and a normal molded product is transferred to the next step.

When changing the length between the surface of each shoe and the bolt head of the adjusting bolt, the screwing position of the adjusting bolt with respect to the shoe is changed and tightening is performed using a lock nut or the like.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a twist straightening device for a press-formed product according to the present invention will be described in detail below with reference to the drawings, in which the same reference numerals are given to the same components as the conventional components.
In this embodiment, the twist correcting device is provided at the final stage of the transfer press device.
The work 7 press-formed into an uneven shape by the press-forming die shown in FIG.

In the configuration shown in FIG. 1, 1 is an upper die shoe, and a plurality of adjusting bolts 10, 10 are screwed and fixed in screw holes 9, 9 formed in the lower surface of the upper die shoe 1. The lock nuts 11 for locking the locking bolts determine the downward protruding positions of the adjusting bolts 10, 10. On the other hand, 4 is a lower die shoe, and a plurality of adjusting bolts 14 and 14 are screwed and fixed in screw holes 13 and 13 formed in the upper surface of the lower die shoe 4 to prevent loosening. The adjusting bolt 1 by the nuts 15 and 15
The upward projecting positions of 4, 14 are determined.

Reference numeral 17 is a guide post fixed to the upper mold shoe 1, and 18 is a guide post fixed to the lower mold shoe 4, and a positioning block 19 is inserted between both guide posts 17, 18. The positioning block 19 determines the distance in the height direction between the upper die shoe 1 and the lower die shoe 4.

Numerals 21 and 22 are product guides which are erected and fixed on the lower die shoe 4, and a work 7 is arranged between the product guides 21 and 22. Reference numeral 23 denotes a lifter. The lifter 23 has an inner side for receiving the work 7 conveyed from the previous process in the transfer press device and for inserting a transfer finger for conveying the work 7 to the next process. Spring 2 placed in
It is lifted by 4,25.

FIGS. 3 and 4 are plan views showing the mounting positions of the adjusting bolts on the upper die 1 and the lower die 4, respectively, and the adjusting bolt 10 screwed and fixed to the upper shoe 1 as shown. The adjusting bolts 14 screwed and fixed to the lower shoe 4 are arranged in a fixed positional relationship with each other.

The operation of this embodiment having such a configuration will be described below. The distance in the height direction between the upper die shoe 1 and the lower die shoe 4 corresponding to the work 7 is previously determined by the guide posts 17 and 18 and the positioning block 19.

First, a work 7 made of a high-tensile steel plate is inserted between an upper die and a lower die punch of a usual press molding apparatus by a transfer press, and the work of pressing the uneven shape shown in the drawing is carried out. 7 is sent to the twist straightening device according to the present embodiment.

The work 7 is guided by the product guides 21, 22.
1 to be positioned at the position shown in FIG. 1, and then the upper shoe 1 is guided to the guide posts 17 and 18 based on the driving force of a driving source (not shown), and the positioning block 1
It descends to the position determined by 9. Then, the adjustment bolts 10, 1 screwed and fixed to the lower surface of the upper die shoe 1
0 bolt heads 10a and 10a, and bolt heads 14 of adjustment bolts 14 and 14 screwed and fixed to the upper surface of the lower die shoe 4.
a and 14a are in contact with each other from the upper surface and the lower surface of the work 7 which is press-molded to have an uneven cross-section.

As shown in FIG. 2, the length h between the upper surface of the lower die shoe 4 and the upper surface of the bolt head 14a of the adjusting bolt 14, in other words, when the protruding height of the adjusting bolt 14 is changed, The lock nut 15 is loosened to change the screwing position of the adjusting bolt 14 with respect to the screw hole 13, and then the lock nut 15 is tightened again.
In the case of the adjusting bolt 10 as well, by performing the same operation, the bolt head 14 of the adjusting bolt 14 from the upper die shoe 1
The protrusion length up to a can be changed.

Therefore, when a slight "twist" occurs in the molded product, the "twist" is corrected by the pressing force when the bolt head 10a of the adjusting bolt 10 and the bolt head 14a of the adjusting bolt 14 are in contact with each other. Therefore, it becomes possible to shift to the next step as a normal molded product.

Further, as shown in FIGS. 3 and 4, the screwing fixing positions of the adjusting bolt 10 and the adjusting bolt 14 are arranged over a large number of positions of the upper die 1 and the lower die 4. Therefore, it is possible to change the projecting length of the adjusting bolts 10 and 14 at a specific position, and it is possible to immediately deal with the change of the shape of the work 7, and to correct the screw fixing position. There is an advantage that it does not require a lot of time and man-hours to do.

In this embodiment, as described above, the twist straightening device provided in the final stage of the transfer press device is exemplified, but the twist straightening device itself is provided as an independent device separately from the transfer press device. Is also possible.

[0021]

As described in detail above, according to the twist straightening apparatus for a press-formed product according to the present invention, the height direction between the upper die shoe and the lower die shoe corresponding to the work by the guide post and the positioning block. After deciding the distance, the work after the pressing work is placed between the product guides and screwed to the lower surface of the upper die shoe as the upper die shoe and the lower die shoe approach each other. By the abutting action of the bolt head of the adjusting bolt and the bolt head of the adjusting bolt screwed and fixed to the upper surface of the lower mold shoe, the “twist” generated in the molded product can be corrected.

Since the screwing fixing positions of the adjusting bolts are arranged over a large number of places of the upper die shoe and the lower die shoe, it is possible to change the protruding length of the adjusting bolt at a specific location. Therefore, it is possible to immediately deal with the change of the shape of the work.

Therefore, according to the present invention, even if a slight "twist" occurs in the molded product due to the dimensional accuracy of the press die, much time is required to correct such twist. Since the number of processing steps is not required and it is not necessary to manufacture a new mold, the number of processing days can be shortened, no extra cost is required, and there is an advantage in terms of cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of a twist straightening device according to the present invention.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is a plan view showing a mounting position of an adjustment bolt on the upper die shoe.

FIG. 4 is a plan view showing a mounting position of an adjusting bolt in the lower die shoe.

FIG. 5 is a sectional view of an essential part showing an example of a conventional press-molding die.

[Explanation of symbols]

1 ... Upper die shoe, 4 ... Lower die shoe, 7 ... Work piece, 9, 1
3 ... Screw holes, 10, 14 ... Adjustment bolts, 10a, 14a
… Bolt heads, 11,15… Lock nuts, 17,18…
Guide posts, 19 ... Positioning blocks 21, 22, ...
Product guide, 23 ... Lifter.

Claims (2)

[Claims] 1. A plurality of adjusting bolts, which are provided on the lower surface of the upper mold shoe and are screwed and fixed so that the protruding length downward can be adjusted, and on the upper surface of the lower mold shoe, A plurality of adjusting bolts whose projecting lengths are screwed and fixed so that they are arranged between the product guides that are vertically fixed to the lower shoe as the upper shoe and the lower shoe approach each other. A twist correcting device for a press-formed product, characterized in that the bolt heads of the adjusting bolts are abutted from above and below the formed work to eliminate the twist of the work. 2. The press-formed product according to claim 1, wherein a positioning block that determines a heightwise distance between the upper and lower mold shoes is inserted between guide posts fixed to the upper and lower mold shoes. Twist correction device.