JPS5927680B2 - press frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a frame applied to a large press.

In general, large press frames have problems such as vehicle restrictions during land transportation and the need for extremely large processing machines.

For this reason, it is conventionally known to construct a single frame by stacking steel plates formed into a frame shape and tightly tightening them with tie rods, but large steel plates may be manufactured by a steel manufacturer depending on the size. Since the steel plate is not made of steel, there is a problem that the material is not available, and therefore it cannot be manufactured from a single plate, and generally the method of using two steel plates joined by welding is taken. However, even if welded together to form a frame-shaped single plate, a wide steel plate is required to use as the frame for a large press, and the allowable stress of the welded part is higher than that of other parts. The stress is lower than the allowable stress, and the frame must be made larger accordingly, making it very expensive.

Further, as steel materials become larger, they are inevitably disadvantageous in that their material reliability decreases.

Furthermore, when a frame shape is formed by welding and joining, there is a drawback that the maximum width dimension of the workpiece that can be press-formed cannot be larger than the lateral spacing of the frame.

This invention was made with the aim of eliminating the above-mentioned conventional problems, and one embodiment of the invention will be described below with reference to the drawings.

In the figure, 1 is a frame provided to face each other, and includes a plurality of frame segments formed of steel plates,
At least two or more tie rods 2 that tightly tighten this
It is composed of

A cylinder 3 and a pressure receiving plate 4 are interposed between each frame 1 so as to engage with stepped portions a and b formed on each frame 1, and the upper and lower ends of each frame 1 are interposed so as to sandwich the stepped portions a and b formed on each frame 1. From the outside, warpage prevention beams 5 and 6, respectively;
Separators I and 8 interposed between each beam, tie rods 9 and 10 passing through these, and tie rods 9 and 1
It is tightly tightened through nuts 11 and 12 that have been screwed back to zero.

During this tightening, a certain preload is applied to the tie rods 9 and 10ζ.

Note that 13 is a ram fitted into the cylinder 3, 14 is a packing, 15 is an adapter, 16 is a packing holder, and A indicates an oil-tight chamber formed inside the cylinder 3.

Next, the present invention will be explained in detail.

When pressure oil is fed into the oil-tight chamber A in the cylinder 3, the ram 1
3 begins to descend, the lower end surface of the ram 13 presses the workpiece placed on the pressure receiving plate 4, and a predetermined forming is performed, just as in the conventional case.

At the time of this pressurization, the frame 1 is pulled up and down, and at the same time, the stepped portions a and b that engage the cylinder 3 and the pressure receiving plate 4 are
A strong pressing force acts, and the frame 1 tends to warp in the direction of pulling the tie rods 9 and 10.

The amount of warpage of each frame segment constituting the frame 1 is not constant, and there is a certain difference between both ends and the center, but this difference is due to the warpage prevention beams 5 and 6 and the application of a certain preload. The tie rods 9 and 10 and the nuts 11 and 12 hold it down to a constant or minimum limit.

When the pressurized object completes the predetermined shaping, the ram 13 is pulled up to its initial position by a separately provided pull-back device (not shown).

Since the present invention has the structure and operation described in detail above, the frame of the large press can be formed from a relatively narrow steel plate, which greatly contributes to reducing the manufacturing cost of the large press.

In addition, since the two-part frame is tightened with anti-warpage beams and tie rods, even if the press becomes larger, it is only necessary to lengthen the partitions and tie rods, making it extremely economical to cope with the problem. It is easy to change the size of the workpiece and the machine configuration (frame spacing), and it has many benefits such as diversification.

[Brief explanation of the drawing]

: The drawings show one embodiment of the present invention, and FIG. 1 is a partially sectional front view, and FIG. 2 is a sectional view taken along line 1 to 2 in FIG. 1. 1...Frame, 2,9,10...Tie rod, 3...Cylinder, 4...Pressure plate, 5,6... Warpage prevention beam, 7, 8...
... septum, 11, 12... nut, 13.
...Rum.

Claims (1)

[Claims] 1 A pair of frames constructed by tightening a plurality of frame segments formed from steel plates are arranged opposite to each other, and each frame has a stepped section on the top and bottom inside thereof that engages with the cylinder and the pressure receiving plate. At the same time, anti-warpage beams were arranged on opposite outer edge sides at both upper and lower ends of each frame, a partition was interposed between the two anti-warpage beams, and the two anti-warpage beams and the partition were tightened with tie rods. A press frame characterized by: