JPH0780699A - Transfer press - Google Patents

Abstract

PURPOSE:To improve the life of molds by decreasing the oscillation generated in a press body during operation. CONSTITUTION:A top frame 4 housing a slide 5 at its center is placed on plural pieces of short-length uprights 3 erected on a bed 2. This top frame 4 and the bed 2 are coupled by means of first tie rods and a crown 7 in which a slide driving mechanism for vertically driving the slide 5 is installed on the top frame 4. The crown 7 and the top frame 4 are coupled by second tie rods 8. Since the oscillations by the exciting force acting on the press body during press operation are drastically decreased, the mold life is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer press which prevents the press body from shaking during operation.

[0002]

2. Description of the Related Art Most of conventional transfer presses are shown in FIG.
As shown in FIG. 2, a plurality of uprights b are erected on a bed a, and a crown c is laid horizontally between the upper ends of the uprights b. There is a connection between a and the crown c.

[0003]

However, in the above-mentioned conventional transfer press, since the length of the upright b becomes longer as the size of the press main body becomes larger, the left and right of the press main body due to the eccentric load generated between the upper and lower molds during operation. Since the amount of deformation of the crown c, the upright b, and the bed a in 3 is different, swaying occurs in the press body. Further, when the press body shakes during operation, a lower mold installed on the bed a and an upper mold mounted on the slide e (both not shown).
There is a problem that core misalignment occurs between them and the mold life is shortened at an early stage. Further, since the bed a and the crown c are connected by a single tie rod d, a crown c having substantially the same size as that of the bed a is required, and the crown c becomes large, and when soundproofing is taken, There is also a problem that a large amount of cost is required for soundproofing measures because the shaded area of must be covered with a soundproofing cover. The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a transfer press in which the press body is less likely to shake during operation.

[0004]

In order to achieve the above object, the present invention places a top frame having a slide at its center on a plurality of short uprights standing on a bed. Then, the top frame and the bed are connected by a first tie rod, and a crown in which a slide drive mechanism for vertically driving a slide is housed is installed on the top frame, and the crown is connected to the top frame. It is connected by the second tie rod.

[0005]

[Operation] With the above configuration, the vibration of the press body can be significantly reduced against the vibration force acting during operation, and the top frame blocks the noise generated from the slide drive part, so no noise is provided without a soundproof cover. Can be reduced.

[0006]

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings shown in FIG. In FIG. 2 and FIG. 3, 1 is a press body, and a plurality of, for example, four short uprights 3 having short lengths are erected at each corner of the bed 2, and a top frame 4 is mounted on these uprights 3. It is placed. As shown in FIG. 4, the top frame 4 has a box-shaped welding structure in which steel plates are arranged in a grid and welded, and has a cavity 4a for accommodating the slide 5 in the center and The four corners of the top plate 4 and the four corners of the bed 2 are connected by, for example, four first tie rods 6 vertically inserted into each of the uprights 3.

On the upper portion of the top frame 4, there is mounted a rectangular crown 7 having a width sufficiently smaller than the front and rear widths of the top frame 4. A slide drive mechanism (not shown) for driving the slide 5 up and down is housed in the crown 7, and between the top frame 4 and the crown 7, for example, four slides are provided at four corners of the crown 7. Are connected by a second tie rod 8.

To explain the operation, in the press body 1 having the above-described structure, the bed 2, the upright 3, the top frame 4, the slide 5 and the crown 7 are separately manufactured in a factory, and temporarily assembled in the factory and then disassembled. Transported to the installation site,
At the installation site, it is reassembled into the state shown in FIGS. 2 and 3.

When the press body 1 is in operation, the slide driving mechanism in the crown 7 moves the slide 5 up and down to move the slide 5 up and down to the upper die mounted on the lower surface of the slide 5 and on the bed 2 via the bolster. Mold (both not shown)
Although it is used for press molding between the upper mold and the lower mold during operation, the amounts of deformation of the crown 7, the uprights 3, and the bed 2 on the left and right of the press main body 1 are different from each other. Shaking in the left / right direction occurs.

In the present invention, in order to reduce this fluctuation,
The length of the uprights 3 is shortened, and a top frame 4 having high rigidity is interposed on each of the uprights 3, and the first tie rod 6 is provided between the bed 2 and the top frame 4, and the top frame 4 and the top frame 4 are also provided. The second tie rod 8 connects the crowns 7 installed above. As a result, for a conventional press (curve A in FIG. 5),
In the press of the present invention, the displacement in the left-right direction is significantly reduced as shown by the curve B, so that the shake during operation can be reduced.

FIG. 5 shows the result of FEM analysis (static change when an exciting force is applied in the left-right direction of the press). Further, FIG. 6 shows an FEM dynamic analysis (simulating the state of swaying on the crown when the maximum press capacity is used). In this figure, the solid line shows the conventional press and the broken line shows the press of the present invention.

[0012]

As described in detail above, according to the present invention, a top frame is installed on an upright which is erected on the bed and has a short length, and a first tie rod is provided between the top frame and the bed, and the top frame. Since the crown installed above and the top frame are connected by the second tie rod, it is possible to greatly reduce the sway of the press body against the vibration force acting during operation. As a result, there is no misalignment between the upper die and the lower die, so that the life of the die can be significantly improved, and the rigidity of the press body itself is increased, so that the molding accuracy is also improved. Further, by providing the top frame, the crown can be miniaturized, and various devices conventionally installed on the crown can be installed on the top frame, so that the overall height of the press body can be reduced. Furthermore, by housing the slide in the top frame,
Since the top frame can prevent the noise generated from the slide drive unit from being diffused to the surroundings, soundproofing can be performed without providing a soundproof cover over a wide area between the uprights, which is economical.

[Brief description of drawings]

FIG. 1 is a perspective view showing a conventional transfer press.

FIG. 2 is a perspective view of a transfer press according to an embodiment of the present invention.

FIG. 3 is a view from the direction Y in FIG.

FIG. 4 is a sectional view taken along line XX of FIG.

FIG. 5 is a diagram showing lateral displacement of a transfer press according to an embodiment of the present invention and a conventional press.

FIG. 6 is a diagram showing a dynamic displacement of a transfer press according to an embodiment of the present invention and a conventional press.

[Explanation of symbols]

1 ... Press body, 2 ... Bed, 3 ... Upright, 4 ... Top frame, 5 ... Slide, 6 ... First tie rod, 7
… Crown, 8… Second tie rod.

Claims (1)

[Claims] 1. A top frame 4 accommodating a slide 5 in the center is placed on a plurality of short uprights 3 provided upright on a bed 2, and the top frame 4 and the bed 2 are While connecting with the first tie rod 6,
A transfer press in which a crown 7 accommodating a slide driving mechanism for vertically driving a slide 5 is installed on the top frame 4, and the crown 7 and the top frame 4 are connected by a second tie rod 8.