JPH02108419A - Stepped bending die - Google Patents

Abstract

PURPOSE:To reduce manufacturing cost of the de and set-up man-hour for the die by fixing spacer members having cut-off corner parts in equal height attachably and detachably to face each other on 1st and 2nd V-grooves of the lower die and upper die. CONSTITUTION:The spacers 50 having the equal heights of cut-off corner parts 50a are fixed in the 45 deg. V-grooves 34,40 of the lower die 30 and upper die 36 to face each cut-off corner parts 50a respectively. A metallic plate member 55 is inserted between the lower die 30 and upper die 36, as the upper die 36 is pressurized toward the lower die 30 through driving the ram 47, the stepped bending work excellent in squareness is performed for the metallic plate member 55. The height of the stepped bending is decided by the height of the gullet corner part 50a of the spacer 50, when the stepped bending height is to be changed, through changing the spacer 50 to be inserted into the 45 deg. V-grooves 34,40 of the lower die 30 and upper die 36 into new spacer 50 having a required cut-off height simultaneously, it is easily achieved.

Description

[Detailed Description of the Invention] Summary The purpose of this invention is to provide a step bending die used for step bending of sheet metal, which reduces both the mold production cost and the number of man-hours required for removing the mold film. 45° between the first side wall surface and the first side wall surface
A lower mold having a first inclined surface arranged to form an angle with a first inclined surface defining a first V groove, and a second inclined surface arranged at right angles to the first inclined surface, and a second inclined surface perpendicular to the horizontal lower end surface. a second side wall surface and a third inclined surface forming an angle of 45° with the second side wall surface and disposed parallel to the first inclined surface of the lower mold;
an upper mold having a fourth inclined surface that defines a second V groove having the same shape as the groove and is disposed perpendicularly to the third inclined surface and parallel to the second inclined surface of the lower mold; and a spacer member in which at least one 45° corner of a member having the same shape as the second V groove is cut off perpendicularly to the bottom wall, and each corner has a spacer member having a cut-off corner of the same height. They are configured to be removably fixed to the first and second V grooves of the lower mold and the upper mold, respectively, so as to face each other.

INDUSTRIAL APPLICATION FIELD The present invention relates to a stepped bending die used for step bending of sheet metal.

Many mechanical parts made from sheet metal are used in communication equipment such as transmission equipment, switchboards, and radio equipment, and among them, step bending (bending at 90° twice and repeating the bending process so that the surface becomes stepped) is used. ) are often used. Since the height of this stepped portion ranges from 1.0 to 7.0 mm, there is a demand for a stepped bending mold that does not require much man-hours for mold setup.

2. Description of the Related Art A conventional step bending die is constructed as shown in FIG. 4, for example. In the same figure, 1 is a lower mold, and a horizontal upper end surface 2,
45° inclined surfaces 3a that are perpendicular to each other.

3b, and a 45° inclined surface 5 that is perpendicular to the inclined surface 3b. Reference numeral 6 denotes an upper mold, which includes a horizontal lower end surface 7, a right-angled V groove 9 defined by 45° inclined surfaces 3a and 3b that are perpendicular to each other, and a right-angled V groove 9 that is perpendicular to the inclined surface 8b and parallel to the inclined surface 5 of the lower mold 1. It has a 45° inclined surface 10. Reference numeral 11 denotes a mounting portion that is attached to the ram of the press. Further, 12 is a sheet metal which is subjected to step bending by the lower die 1 and the upper die 6.

The lower die 1 and the upper die 6 are arranged in a positional relationship as shown in the figure, and the sheet metal 12 to be subjected to step bending is inserted between the lower die 1 and the upper die 6. By pressing the upper die 6 against the lower die 1 by a ram (not shown), the sheet metal 1 is bent into steps as shown in the figure.
You can get 2.

However, with such a step bending mold, in order to provide many types of step bending with different step bending dimensions, it is necessary to prepare a large number of lower and upper molds with different dimensions, and the mold manufacturing process is required. In addition to being expensive, there are various problems such as troublesome mold management and the need for a large mold side space. In order to solve these problems, the present inventors prototyped a stepped bending mold as shown in FIG.

In FIG. 5, 15 is a lower die holder, and a block 16 and a spacer 17 are fixed to the lower die holder 15 by bolts (not shown). Block 16 and spacer 1
A step 18 for step bending is formed between the spacer 17 and the spacer 17, and the height of the step 18 can be adjusted by changing the height dimension of the spacer 17. 20 is an upper mold holder, and the upper mold is constructed by fixing a block 21 and a spacer 22 to this upper mold holder 20 with bolts. A step 23 having the same height as the step 18 is formed between the block 21 and the spacer 22 .

24 is a mounting portion for mounting the upper die holder 20 to a ram (not shown). Further, 25 is a sheet metal that has been subjected to step bending.

This step-bending mold has the advantage that the mold manufacturing cost is low because the step-bending dimension can be changed by changing the heights of the spacers 17 and 22.

Problems to be Solved by the Invention As mentioned above, in the stepped bending mold as shown in FIG. There are problems in that mold manufacturing costs are high, mold management is troublesome, and a large mold side space is required to accommodate many types of molds.

In addition, in the step-bending mold as shown in FIG. 5, when the upper mold holder 20 is pressed against the lower mold holder 15 by a ram,
The upper mold holder 20 escapes in the direction of arrow A, and the sheet metal 25
There was a problem in that the squareness of the stepped bent portion 25a could not be obtained, resulting in an increase in the number of man-hours required for rework. Furthermore, there is a problem in that only one dimension of step bending can be performed with one spacer, and many types of spacers with different height dimensions are required.

The present invention has been made in view of these points, and its purpose is to provide a stepped bending mold that reduces both mold manufacturing costs and mold film removal man-hours.

Means for Solving the Problem A first V-groove is defined in the lower mold by a first side wall surface perpendicular to the horizontal upper end surface and a first inclined surface arranged at an angle of 45° to the first side wall surface. and a second inclined surface disposed perpendicular to the first inclined surface.

The upper mold also has a second side wall surface perpendicular to the horizontal lower end surface and a second side wall surface perpendicular to the horizontal lower end surface.
A second V-groove having the same shape as the first V-groove is defined by a third inclined surface having an angle of 45° on the side wall surface and arranged parallel to the first inclined surface of the lower mold, and a third inclined surface. A fourth inclined surface is provided perpendicular to and parallel to the second inclined surface of the lower mold.

Furthermore, several types of spacer members are prepared in which at least one 45° corner of a member having the same shape as the first and second V-grooves is cut off perpendicularly to the bottom wall, and the spacer members have cut-off corners of the same height. The spacer members are removably fixed to the first and second V-grooves of the lower mold and the upper mold, respectively, so that their corner portions face each other.

Function: In the stepped bending die of the present invention, the third inclined surface of the upper die bites into the first inclined surface of the lower die when pressurized, so that step bending with good perpendicularity can be achieved. In addition, by cutting off the spacer members installed in the first and second V-grooves and changing them to spacer members with different corner heights, it is possible to perform many types of step bending with different dimensions with high accuracy. .

Further, by cutting off both 45° corners of the spacer member to different height dimensions and inverting them for use, it is possible to achieve two step bends with different step bending dimensions with one spacer member.

Example Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 shows a side view of an embodiment of the invention.

30 is a lower mold, which is fixed to a gouey holder 44 with bolts 45 using a block 46. The lower mold 30 has an elongated shape, and is fixed to the gouging holder 44 with a plurality of bolts 45. The lower mold 30 has a side wall surface 32 perpendicular to the horizontal upper end surface 31 and a 45° angle to this side wall surface 32.
A 45° V-groove 34 is defined by the inclined surface 33 arranged to form an angle of . Further, the lower mold 30 has a 45° inclined surface 35 arranged at right angles to the 45° inclined surface 33.

On the other hand, 36 is an upper mold, which forms a 45° angle with a side wall surface 38 perpendicular to the horizontal lower end surface 37 and the lower mold 3.
A 45° V-groove 40 having the same shape as the 45° V-groove 34 of the lower die 30 is defined by an inclined surface 39 arranged parallel to the 45° inclined surface 33 of 0.

The upper mold 36 also has a 45° inclined surface 41 arranged perpendicular to the 45° inclined surface 39 and parallel to the inclined surface 35 of the lower mold 30.
is provided. Reference numeral 42 denotes a mounting portion for the upper mold 36. By pressing this mounting portion 42 against the ram 47 using a plurality of bolts 49 using a plate member 48, the upper mold 36 can be attached to the upper mold 36.
is attached to a ram 47 of a press machine (not shown). The upper mold 36 has an elongated shape with the same length as the lower mold 30.

50 is a spacer, which is fixed in the 45° V-groove 34 of the lower mold 30 with a plurality of hexagon socket bolts 51. Similarly, a spacer 50 having the same shape is fixed in the 45° V groove 40 of the upper die 36 with a plurality of hexagon socket bolts 52. The height of the cut corner 50a of the spacer 50 and the lower die 30
The height of the exposed portion 33a of the 45° inclined surface 33 is the same height, and the height of the cut corner portion 50a of the spacer 50 is the same as the height of the exposed portion 39a of the 45° inclined surface 39 of the upper die 36. It is high. Reference numeral 55 indicates a sheet metal member subjected to step bending.

Referring now to FIGS. 2 and 3, side and front views of spacer 50 are shown, respectively.

The spacer 50 is formed with cut-off corners 50a and 50b having different height dimensions, and the distance between the cut-off corner 50a and the perpendicular line drawn from the top angle to the bottom in FIG. 2 is cut off by A1. If the distance from the corner 50b is B,
A as shown in Table 1.

By manufacturing 15 types of spacers 50 with the value of B set, the stepped bending height was changed in 0.2 mm increments.
0~? , On can be achieved. As is clear from Table 1, the value of A+B is always 20.48
It is set to be equal to mm. This is because when the height of the cut-off part of the spacer 50 is high, a larger force is applied during step bending compared to when the cut-off height is low, and the height of one cut-off part is When the height is high, the height of the other cut-out portion is set to be low, so that the pressing force applied to each spacer 50 during step bending is averaged.

Table 1 However, when performing a predetermined step bending process on the sheet metal member 55, the lower die 30, the upper die 36, and the spacer 50 are arranged as shown in FIG. That is, the cut-off corner portion 50a of the same height
A spacer 50 having a 45° angle between the lower mold 30 and the upper mold 36
Each cut-off corner 50a is fixed in the V-groove 34, 40 so as to face each other. A sheet metal member 55 is inserted between the lower mold 30 and the upper mold 36, and the ram 47 is driven to move the upper mold 36 into the lower mold 3.
When the pressure is applied to 0, the sheet metal member 55 can be bent in steps with good perpendicularity. The stepped bending height is determined by the height of the cut corner 50a of the spacer 50, and if you want to change the stepped bending height, the lower die 30 and the upper die 36
This can be easily achieved by simultaneously changing the spacer 50 inserted into the 45° V-groove 34, 40 with a new spacer 50 having the desired cutting height.

According to this embodiment, since the corners of both ends of the spacer 500 are cut to different heights, by inverting and using one spacer, two types of step bending with different dimensions can be achieved with one spacer. can do.

Effects of the Invention Since the stepped bending die of the present invention is constructed as detailed above,
This has the effect of significantly reducing mold manufacturing costs. Furthermore, the number of setup steps during step bending can be significantly reduced, mold management becomes easier, and step bending of good quality can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the present invention, Fig. 2 is a side view of a spacer member of the invention, Fig. 3 is a front view of a spacer member, Fig. 4 is a side view of a conventional example, and Fig. 5 is another conventional example. FIG. 30...lower mold, 34...45°V groove, 36...
...Upper mold, 40...45°V groove, 44...Gui holder, 47...Ram, 50...Spacer, 50a, 50b...Cut off corner, 55...Sheet metal.

Claims (1)

[Claims] A first side wall surface (32) perpendicular to the horizontal upper end surface (31) and a first inclined surface (33) disposed at an angle of 45° to the first side wall surface. While defining a 1V groove (34),
A second inclined surface (
a lower mold (30) having a second side wall surface (38) perpendicular to the horizontal lower end surface (37); A third inclined surface (39) arranged parallel to the inclined surface (33)
) and a second V groove (4) having the same shape as the first V groove (34).
0) and a fourth inclined surface (41) arranged perpendicularly to the third inclined surface (39) and parallel to the second inclined surface (35) of the lower mold (30). It is made up of a mold (36) and a spacer member (50) having the same shape as the first and second V-grooves (34, 40), with at least one 45° corner cut off perpendicularly to the bottom wall. A spacer member (50, 50) having a cut-off corner (50a, 50a) with a height and a second V-groove (34, 40), each of which is removably fixed.