JPH0539714U - Metal plate bending mold - Google Patents

Abstract

(57) [Abstract] [Purpose] With the lower mold that enables adjustment of the groove width of a metal plate bending mold, one purpose is to be able to perform various various bending processes with a single lower mold. [Constitution] An outer frame for the lower die is provided, and a bending die divided into two is placed inside. A wedge-shaped intermediate piece is movably provided between the outer frame and the bending die, and this intermediate piece is pushed and pulled by a push bolt. Then, the spacing between the two divided dies, that is, the groove width, is adjusted to obtain the required lower die, and the bending work can be easily performed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a metal mold for bending a metal plate such as a press and a press brake.

[0002]

[Prior Art]

 A conventional metal mold for bending a metal plate will be described with reference to FIGS. 4 and 5. The bending process in the metal plate processing is to place the metal plate 1 between the upper mold 2 and the lower mold 3 and press the metal plate 1 to form the flat plate 1 at a required angle. The bending angle and the bending radius R of the molded product after the bending process are determined by the groove width A of the V groove 4 of the lower die (die) and the shape of the upper die 2 (punch).

As described above, in order to obtain a forming plate having a predetermined bending radius, the groove width A of the lower mold 3 is set to an optimum dimension (usually, the groove width A is 6 It is necessary to change the lower mold 3 each time.

The same applies to the case of R bending as shown in FIG. 5, which is performed by the R bending upper die 5 and the R bending lower die 6, but in this case as well, the bending radius R and the plate thickness are different. Therefore, it is necessary to replace the lower die 6 for R bending.

In particular, in the case of R-bending, since "good appearance" is important together with the accuracy of the dimension of the radius R, it is necessary to finely adjust the groove width A, and the groove width A is specified. In some cases, a special lower die is manufactured, or in the process of trial bending, the lower die is removed and fine cutting is performed several times to make adjustments.

[0006]

[Problems to be solved by the device]

 As described above, in the bending process, it is necessary to replace the mold each time to obtain a specific bending angle.

The mold used for the bending work is usually a considerable weight because tool steel is used to provide sufficient rigidity. Therefore, the replacement work is very dangerous. Also, as mentioned above, when the metal plate is bent, the mold replacement work is frequently performed, so the setup time occupies most of the total work time, which in turn results in the bending work cost. Is also increasing. Furthermore, in order to support a wide variety of bending processes, it is necessary to prepare the same number of molds as the type of bending, especially the lower mold, which requires a large storage space, which increases storage costs. ing. In view of the above, the present invention has an object to make it possible to adjust the groove width of the lower mold and perform various bending processes with one lower mold.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention forms a lower mold capable of changing the groove width by forming the mold into two parts with groove parts and providing a wedge-shaped intermediate piece so that the groove width can be adjusted steplessly. .

That is, a box-shaped outer frame is provided, and a pair of bending dies are provided along the inner side of the outer frame with an interval (groove width A). Further, a wedge-shape is provided between the outer frame and the folding dies. An intermediate piece is provided, and the wedge-shaped intermediate piece is configured to be moved by a push bolt between the outer frame and the bending piece.

[0010]

[Action]

 In the above structure, when the push bolt is rotated to push in the wedge-shaped intermediate piece, the pair of bending molds approach each other along the slope of the wedge-shaped intermediate piece, and the groove width is narrowed. On the contrary, when the wedge-shaped intermediate piece is pulled out, the bending die is expanded by the spring and the groove width becomes wider. In this way, the required groove width of the lower mold can be obtained.

[0011]

【Example】

 The present invention will be described based on the embodiments shown in FIGS. A conventional solid lower mold as shown in FIGS. 4 and 5 is divided into two along the V groove, and the bending mold divided into two is moved to adjust the interval (groove width A).

That is, a box-shaped outer frame 7 is provided, and a pair of folding dies 8 in the shape of a rectangular parallelepiped having a slope on the back side are arranged inside the box with a space (groove width A). Between the folding molds 8 and 8, compression springs 9 and 9 are arranged to spread the gap.

Further, wedge-shaped intermediate pieces 10 and 10 are sandwiched between the outer frame 7 and the folding dorsal side of the folding die 8 in contact with the gradient and the opposite gradient. The intermediate piece 10 is combined with the outer frame 7 at a dovetail groove 11, and a push bolt 12 with a handle combined with the outer frame 7 is provided so as to push and pull the intermediate piece 10. The bending work using the mold having such a structure will be described with reference to FIG.

When the metal plate 1 is bent at 90 ° by R bending, the lower mold 13 and the upper mold 5 for R bending of the present invention are installed in the press brake, and the push bolt 12 with the handle is rotated to move the intermediate piece 10 1. Move by pushing and pulling, adjust the groove width A of the lower die 13 with the length B of the arc corresponding to 90 ° of the bending radius R as a guide, and press the metal plate with the upper die 5 to bend it. .

The bending angle of the metal plate 1 after molding is measured, and when the bending angle is insufficient, the bolt 12 with a handle is rotated to expand the groove width A, and the metal plate 1 is put into the mold again and pressed. The desired bending angle can be easily obtained by repeating adjustment with the handle, re-pressurization, and measurement several times. In this way, once the groove width A at which the required bending process can be performed is once adjusted, the accurate bending process can be performed a stable number of times in a stable manner.

As described above, it is possible to easily adjust the processing conditions of the upper die, the lower die and the plate to be processed, that is, the groove width A corresponding thereto, shorten the setup time, and eliminate the risk of die replacement. It enables stable bending work.

[0017]

[Effect of the device]

 According to the present invention, it is possible to handle various plate bending processes with one die, and it is not necessary to use many types of lower dies, thus reducing the storage space and setup time. Further, since it is not necessary to replace the mold, it is possible to improve work safety.

[Brief description of drawings]

FIG. 1 is a plan view of a lower die of a metal plate bending work die according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a cross-sectional view illustrating processing by a mold according to the present invention.

FIG. 4 is a sectional view for explaining a bending process using a conventional die.

FIG. 5 is a cross-sectional view for explaining an R bending process using a conventional die.

[Explanation of symbols]

 2, 5 Upper mold 3, 6 Lower mold 7 Outer frame 8 Bending mold 10 Wedge-shaped intermediate piece

Claims (1)

[Scope of utility model registration request] 1. A metal plate bending mold comprising an upper mold and a lower mold, wherein a box-shaped outer frame and a pair of wedge-shaped bending pieces facing each other at a distance are provided in the outer frame, and Between the outer frame and the bending piece, a pair of wedge-shaped intermediate pieces to be assembled with each other are provided to form a lower mold having a U-shaped cross section, and the wedge-shaped intermediate piece is slid so that a space between the pair of bending pieces is formed. Metal plate bending mold characterized by steplessly adjusting the interval.