JPS6320416Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mold used for hemming work using a press machine.

Conventionally, building materials for housing, etc., have often had a cross-sectional shape as shown by W in Figure 2 (the shape beyond the hemming is indicated by a two-dot chain line). Corner A of the mold moves to the left on the blank, creating a large force in the direction of the folded end (indicated by the arrow). Therefore, the material must be firmly attached to the lower die, and since this work is generally done with a press brake, such forces have an adverse effect on the upper and lower aprons, which are structurally weak in this direction.

The purpose of this invention is to eliminate such conventional drawbacks and provide a hemming die that prevents the generation of large thrust by sliding a part of the upper die in a direction perpendicular to the lifting direction at the same time as it is lowered. shall be.

Next, a preferred embodiment of this invention will be described in detail based on the drawings.

Figure 1 is a front view of the press brake with the hemming mold of this embodiment attached, showing the upper and lower aprons 1 and 1.
3. The relative positions of the side plate 5, upper die 7, lower die 9, etc. are shown. FIG. 2 is a cross-sectional view (during material processing) of FIG. 1. An upper mold 7 is attached to the upper apron 1, and a plate holding mold 7-1 is attached to the lower surface of the upper mold 7.
It is provided opposite to the processing surface B so as to be freely engageable and detachable.
A slide mold 7-2 is further attached to the lower surface of the upper mold 7.
It is provided above the second machining surface C of , and is slidably provided in the left-right direction by a plurality of guide rods 11. The slide mold 7-2 is pushed to the left by a weak spring 13 at the beginning of the hemming operation, as shown in FIG.

When the upper apron 1 is lowered, the material W is fixed between the first processing surface B of the lower die and the plate holding die 7-1, and hemming is performed from the position shown in Fig. 2, the slide die 7-2
moves rightward along the guide rod 11 at the same time as it descends, and the lower corner A descends together with the material W along the arc shown by the dotted line. Therefore, the material W and the slide mold 7-
The contact point 2 does not change, and no large force is generated in the direction of the arrow.

As is clear from the above explanation, when hemming is performed using the mold of this invention, it is easy to attach the material because no large thrust is generated, there is no mold damage to the material, and there is no strain on the press machine. effective.

[Brief explanation of the drawing]

FIG. 1 is a front view of a press brake equipped with a hemming die according to an embodiment of this invention, and FIG. 2 is a cross-sectional view taken along the line shown in FIG. 1. 1... Upper apron, 3... Lower apron, 5
...Side plate, 7...Top mold, 7-1...Plate holding mold, 7
-2...Slide mold, 9...Bottom die, 11...Guide rod, 13...Spring, A...Lower corner of slide die, B...First machining surface of bottom die, C...Bottom die the second of
Processed surface, W...Material.

Claims (1)

[Scope of utility model registration request] In the bending mold of the press machine, the upper surface of the lower mold is configured as a first processing surface and a second processing surface so as to form a step, and the upper mold has a plate holding mold that can be freely engaged and detached on the first processing surface. Hemming of a press machine, which is provided so as to be movable up and down, and a slide mold that can be freely engaged and disengaged is provided on the lower surface of the upper die, on the second processed surface and on the upper surface of the plate holding die, so as to be slidable in a direction perpendicular to the up-and-down direction. Type.