JPS6320409Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a press die for bending a press material.

As is well known, automobile doors and the like are manufactured by forming pressed materials using press dies, and during the manufacturing process, the edges of the pressed materials may be bent. In some cases, a bulge occurred near the bending point. FIG. 1 is a diagram showing how such bulges occur. That is, the press material 2 placed on the lower die 1 is pressed and fixed by the pad 3, and in this state, the upper die 4 is lowered by a ram (not shown), and the press material 2 is pressed and fixed by the curved blade 5. The edges of the press material 2 are bent downward, but because complex stresses such as compressive stress act on the press material 2 near the bend, it partially swells against the pressing force of the pad 3. Such bulges greatly impair the appearance of the product, and become a serious design defect, especially in the case of parts that form a design, such as the hood luggage of an automobile. Therefore, in order to eliminate the bulge mentioned above, it is possible to increase the pressure to press down the press material, or to press the bulge of the press material at the same time as bending, but in order to increase the pressure, a pressurizing system is Since it is necessary to change or increase the amount, the equipment cost increases significantly.Therefore, in the past, the following method was used to eliminate the above-mentioned bulge. In other words, a part of the contact surface between the press material and the pad (the part farthest from the bent part of the press material) is cut to reduce the contact area and thereby increase the pressure applied to the bulge. be. However, with this method, the area to be removed cannot be determined unambiguously, so cutting operations must be carried out through trial and error based on experience.As a result, the operation becomes complex and time-consuming, and the contact between the pads There was a problem that if the surface was removed too much, it could not be corrected.

This invention was made in view of the above circumstances, and aims to provide a press mold for bending that can easily crush the bulge that occurs in the bent portion of the press material.

This committee provides a pad abutting part that protrudes from the underside of the pad so that it comes into direct contact with a part of the upper surface of the lower mold that is away from the part where the press material is to be placed, and the pad abutting part. It is characterized in that opposing contact parts for the lower mold are formed on the upper surface of the lower mold, and an adjustment plate is removably interposed between the contact parts for the pad and the contact part for the lower mold. It is something.

An embodiment of this invention will be described below with reference to FIGS. 2 and 3. FIG. 2 shows an embodiment of this invention, and shows a press die for bending the edge of the press material 2. In other words, press material 2
A lower die 1 for placing the press material 2 is fixed on a bolster (not shown), and the lower die 1 has a placing part 6 on which the press material 2 is placed and a lower die protruding upward on the side thereof. It has a contact part 7 for use. Furthermore, an upper die 4 is attached to the lower surface of a ram (not shown) located above the lower die 1, and a bend is provided at the lower end of the side of the upper die 4 for bending the edge of the press material 2 at right angles. Blade 5 is attached. Further, on the lower surface of the upper mold 4, a pad 3 for pressing the vicinity of the bent portion of the press material 2 is slidably attached to the upper mold 4 via a sliding member 8. Further, a stopper 9 for preventing the pad 3 from falling off is erected on the upper surface of the pad 3 through a through hole 10 formed in the upper mold 4. Furthermore, a spring 11 is provided at the top of the pad 3 to provide a part of the pressing force for pressing the vicinity of the bent portion of the press material 2, and plates 12 are provided at both ends (the left and right ends in FIG. 2) of the top surface of the pad 3. installed. In addition,
The stopper 9 and the spring 11 are arranged approximately symmetrically on the upper surface of the pad 3. Therefore, the pad 3 is configured to apply not only the elastic force of the spring 11 but also the rolling force of the ram directly to the press material 2 through the plate 12 near the bent portion of the press material 2. In addition, Pad 3 is
On its lower surface, there is a narrow pressing part 13 that presses the vicinity of the bent part of the press material 2, and a pad part that protrudes downward toward a part of the lower mold 1 that is opposite to the part removed from the placing part 6. It has a contact portion 14. Further, the pad contact portion 14 is located at a position opposite to the lower mold contact portion 7, and the upper surface of the lower mold contact portion 7 has a distance from the lower surface of the pad contact portion 14. An adjustment plate 15 for adjustment is detachably attached. Therefore, by adjusting the thickness of the adjusting plate 15 of the pad 3, the pad abutting part 14 can be adjusted to the adjusting plate 15 on the lower mold abutting part 7.
Immediately after coming into contact with the press material 2, the pressing part 13 contacts the upper surface of the press material 2 on the lower die 1, and as a result, the pad 3 has a structure in which the pressing part 13 moves in the direction of the bending part of the press material 2 during bending. It is configured so that it rotates very slightly.

Using the press mold configured as described above, the press material 2 is bent as follows. First, as the pad 3 is lowered together with a ram (not shown), the upper surface of the press material 2 is shown with the pad contact portion 14 in contact with the adjustment plate 15 on the lower mold contact portion 7. The thickness of the adjusting plate 15 is adjusted so that the gap between the pad 3 and the lower surface of the pressing part 13 is about 1/10 of the thickness of the press material 2. Then lower mold 1
The press material 2 is positioned and placed thereon, and the edge of the press material 2 is made to protrude from the end (left side in FIG. 2) of the lower mold 1 by a predetermined dimension. When the upper die 4 is further moved downward by the lowering of the ram, the pad contact part 14 comes into contact with the adjustment plate 15, and immediately after that, the pressing part 13 of the pad 3 comes into contact with the vicinity of the bent part of the press material 2. do. In this state, the sliding member 8 attached to the side of the pad 3 is slightly elastically deformed and a gap is formed between the upper mold 4 and the pad 3, so that the pressing part 13 is pressed against the press material. 2, the contact surface between the press material 2 and the pressing part 13 is in a narrow area near the bend of the press material 2. Further, by lowering the upper mold 4, the pressing force of the spring 11 on the upper part of the pad 3 becomes a rotational force using a predetermined point on the adjustment plate 15 as a fulcrum, so that it is even greater near the bending part of the press material 2. Pressure force can be applied. Thereafter, the upper die 4 is further lowered to bend the edge of the press material 2 which has been pressed and fixed at a right angle by the curved blade 5. At this time, since the pressing force of the pad 3 is based only on the elastic force of the spring 11, if the pressing force is small, a bulge may occur in the vicinity of the bent portion of the press material 2. As the upper mold 4 is further lowered, the upper surface of the plate 12 attached to the upper surface of the pad 3 comes into contact with the lower surface of the upper mold 4, so that the pressing force of the press machine is directly applied to the pad 3. Moreover, since the pressing part 13 of the pad 3 located near the upper part of the pressing part 13 of the pad 3 is inclined, a large pressing force is intensively applied to the bulge, and the bulge can be crushed.

In addition, in the above embodiment, a press die for bending a flat press material 2 was explained, but this invention is not limited to the above embodiment, and as shown in FIG. Even when the edge of the shaped press material 2 is bent using a cam, the bulge that occurs near the bent portion of the press material 2 can be easily crushed by using the press mold based on this invention. . That is, by rotating the pad 3 in the counterclockwise direction in FIG. 3, it is possible to press the vicinity of the bent part of the inclined part 16 of the press material 2 from a direction perpendicular to that surface. The bulge can be crushed by concentrating a large pressing force on the area. Further, instead of using the plate 12 attached to the upper surface of the pad 3 in the above embodiment, the elastic force of the spring 11 placed above the pad 3 is set to be large, so that a large pressing force can be obtained. Good too.

Furthermore, since the pressing portion 13 of the pad 3 has a considerably high surface pressure, it is preferable to increase the strength of the pressing portion by hardening the pressing portion 13 or using a hard material.

Furthermore, the adjustment plate 15 may be detachably attached to the pad abutment part 14.

As is clear from the above description, according to this invention, a pad abutment part is provided that protrudes from the bottom surface of the pad so that it comes into direct contact with a part of the top surface of the lower die that is outside the part where the press material is to be placed. , and a lower mold abutting part opposite to the pad abutting part is formed on the upper surface of the lower mold, and an adjusting plate is removably attached between these pad abutting parts and the lower mold abutting part. Since the pad is configured to be interposed therebetween, rotation occurs in the pad around the location where the adjustment plate is provided, and the pad is tilted at a slight angle toward the bending portion of the press material, resulting in a rotation near the bending portion of the press material. Since the pressing force is concentrated on the press material, it is possible to prevent the so-called blistering of the pressed material.
Alternatively, a pressed product of good quality can be obtained by crushing any bulges that have occurred. In addition, by adjusting the thickness of the adjustment plate, it is possible to adjust the pressing force of the pad that acts near the bent portion of the press material, making the work easier and It is possible to obtain effects such as shortening the manufacturing period and reducing the manufacturing cost.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram for explaining the deformation state near the bending part of the press material, Fig. 2 is a cross-sectional view showing the mounting state of the press die for bending according to an embodiment of this invention, and Fig. 3 is FIG. 7 is a cross-sectional view showing a state in which a press die for bending according to another embodiment of the invention is attached. 1... Lower die, 2... Press material, 3... Pad, 4... Upper die, 5... Curved blade, 6... Placement part, 7
...Contact part for lower die, 11...Spring, 14...
...Abutting part for pads, 15...Adjustment plate.

Claims (1)

[Scope of utility model registration request] In a bending press device in which a pad for pressing and fixing a press material against a lower die is attached to an upper die having a curved blade so as to be movable up and down, a portion of the upper surface of the lower die where the press material is to be placed. A pad abutting portion opposite to the location where the pad has come off is provided to protrude downward from the lower surface of the pad, and a lower mold abutting portion facing the pad abutting portion is formed on the upper surface of the lower mold. A press mold for bending, characterized in that an adjustment plate is detachably attached to either one of the pad contact part and the lower die contact part.