JPS6037130Y2 - Diction device in press - Google Patents

Description

[Detailed description of the invention] This invention relates to a press consisting of a lower die attached to the bed and an upper die attached to the lower surface of the slide, and its purpose is to use fluid pressure to To provide a gou cushion device which can easily adjust the force, can make the gou cushion force constant after the start of drawing, can be provided simply and inexpensively, and is especially suitable for deep drawing.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1 is a bed, and a lower mold 3 is attached to its upper surface 1a via a bolster plate 2.

4 is a slide, and an upper mold 5 corresponding to the lower mold 3 is attached to the lower surface 4a of the slide.

Reference numeral 6 denotes a blank holder which holds the blank material 7 between it and the upper mold 5, and is movable up and down around the lower mold 3.

A space 8 is formed in the bed 1 below the bolster plate 2, and a piston 9 is provided in this space 8.

This piston 9 is integrated with the blank holder 6 via a plurality of cushion pins 10, and a through hole 11 is formed in the bolster plate 2 to allow the cushion pins 10 to move up and down.

A case-shaped fixing member 12 is attached to the lower surface 1b of the bed 1 with a fixture 13, and an elevating member 14 is provided within the fixing member 12 so as to be movable up and down.

A cylinder 15 into which the piston 9 is fitted is erected from the upper surface of the elevating member 14, and a seal 16 is provided on the outer periphery of the piston 9.

Further, an elastic body (such as a spring) 17 is provided between the elevating member 14 and the fixed member 12 to urge the elevating member 14 upward. Let's do it.

Reference numeral 18 indicates a fluid supply/discharge pipe communicating with a fluid chamber 19 formed below the piston 9.

A plurality of rods 20 are erected from the upper surface of the elevating member 14, and a through hole 2 is provided to allow these rods 20 to rise and fall.
1 is installed on the bed 1.

When the blank material 7 is clamped, the upper surface 20 of the rod 20
a and the lower surface 4a of the slide 4, and this gap A is equal to the gap a created between the lower surface of the blank material 7 and the surface of the lower die 3 at this point. The settings are as follows.

The cylinder device consisting of the piston 9 and the cylinder 15 is designed to absorb at least an amount equal to the gap A, a.

As shown in FIG. 1, when the blank material 7 is held between the blank presser 6 and the upper mold 5, the circumferential gaps A and a are equally generated.

When the slide 4 is lowered in this state, the lowering force is transmitted to the piston 9 via the upper mold 5, blank material 7, blank holder 6, and cushion pin 10, and as shown in FIG. The fluid (air, oil, etc.) is compressed against the supply pressure and a portion is discharged from the fluid supply/discharge pipe 18.

Then, the lower surface 4a of the slide 4 is connected to the upper surface 20a of the rod 20.
When the blank material 7 is brought into contact with the lower die 3 to eliminate the gap A, the blank material 7 is brought into contact with the lower mold 3 to eliminate the gap A.

By eliminating the gaps A and a, the aperture starting point B is reached as shown in FIG. 4, and up to this point the cushion pin load increases.

When the slide 4 is further lowered, the blank material 7 is formed between the lower die 3 and the upper die 5 as shown in FIG.

At that time, the elevating member 14 is lowered via the rod 20 and against the elastic force of the elastic body 17, so that the blank presser 6
is lowered with the cushion load being constant P.

The descending amount of the elevating member 14 is equal to the forming descending amount d.

As described above, according to the present invention, it is possible to easily adjust the cushioning force by using fluid pressure, and the downward force of the slide is transmitted to the elevating member via the rod from the start of throttling. Therefore, the die cushion force caused by the elastic body is always constant after the drawing starts.

Furthermore, since an elastic body, a cylinder device, etc. are used, the structure can be simplified and it can be provided at low cost.

Furthermore, it is possible to provide a product particularly suitable for deep drawing.

Furthermore, since the stroke of the cylinder device for the Gui cushion is small, the heat generation of the fluid can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIGS. 1 to 3 are longitudinal sectional front views showing the operating state, and FIG. 4 is a graph. 1... Bed, 2... Bolster plate, 3... Lower mold, 4... Slide, 4
a...Bottom surface, 5...Top mold, 6...
...Blank presser, 7...Blank material, 9...
...Piston, 10...Cushion pin,
12...Fixing member, 14...Elevating member, 15...Cylinder, 17...Elastic body, 18...Fluid supply and discharge pipe , 19...fluid chamber, 20...marked, 20a...upper surface.

Claims (1)

[Scope of utility model registration request] In a press consisting of a lower die mounted on a bed and an upper die attached to the lower surface of a slide, a blank holder that holds a blank material between the upper die and the upper die is configured to be able to be raised and lowered around the lower die. An integrated piston is provided below the bed, and a cylinder for guiding this piston is mounted on an elevating member disposed below the bed, and an elastic force is provided between the elevating member and a fixing member disposed below the elevating member. Set up your body,
A gou cushion device for a press, characterized in that a rod facing the lower surface of the slide is erected from the elevating member.