JPH08257800A - Method for tightening frame of large press - Google Patents

Abstract

PURPOSE: To precisely maintain a large press device by tightening divided long size members while applying a pre-load of a specific magnitude to the division joining tie rods, and joining them. CONSTITUTION: In order to facilitate a transportation, a large press device is divided into a crown 2, a bed 3 and a slide 8. Further, the crown 2, the bed 3 and the slide 3 are divided to the lateral direction, each of them is made to divided long size members 12, 13, 14. After transportation, these are assembled at a prescribed position. Each of divided long size members 12, 13, 14 is tightened with a division joining tie rod 15, 16, 17 and joined. At the time of joining them, a pre-load of 1.2 to 1.5 times of the usual tightening force is applied to the tie rod 15, 16, 17, and they are tightened. Therefore, they can be joined firmly to maintain the high precision. The crown 2, the bed 3 and the slide 8 are joined with the tie rods 8 to form the large press device. The large press device is made easy in transportation and excellent in durability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large press machine, and more particularly to a method for fastening a large press frame in which a long crown and a bed are divided.

[0002] Conventionally, in a large structure such as a shipbuilding tank or a tank, it has been required to press-mold components as integrally as possible, and the pressing apparatus is becoming larger and larger.

[0003]

However, as the press device becomes larger, the crown, bed, etc. become larger, and a large lifting device is required for manufacturing and assembling the press. Due to restrictions, it becomes a big problem especially in land transportation.

For this reason, it has been proposed to divide large components such as a crown, a slide, and a bed into separate parts. However, it is a problem to maintain a high precision against a large pressing force and to mold them with high durability. Was there.

[0005]

The present invention has been made in view of the above points, and in order to solve the above problems, a long crown and a bed are connected by tie rods, and
In a large-sized press device arranged to press-mold the slide by elevating the slide between the crown and the bed, the long crown and the bed are each divided into a plurality in the width direction perpendicular to the press-molding direction, To provide a method for fastening a large-sized press frame, characterized in that the divided long members are joined together, and a preload of a predetermined size is applied to the split joining tie rods to tighten and join the divided long members. It is in.

[0006]

In the large-sized press device of the present invention, which is connected by the tie rods, the width and weight of the large-sized part are determined by dividing the long crown and the bed into a plurality of parts in the width direction perpendicular to the press molding direction. It is possible to limit it to the range of, and it is easy to transport by land and in the factory, and it is easy to process and assemble.

Further, since the divided long members are joined together and a preload of a predetermined size is given to the split joining tie rods to tighten and join the divided long members, a large pressing force can be obtained. The divided long members can be firmly joined with the pre-loaded split joining tie rods, high precision can be maintained, and press molding can be performed with good durability.

Further, by increasing the preload of the split connecting tie rods on both sides of the split elongated member rather than on the center side, it is possible to appropriately cope with the force applied to the crown and the bed and to maintain high accuracy.

Further, the crown and the bed are divided into a plurality of parts with their cross-sections being bilaterally symmetrical, and a paragraph portion is provided near the neutral line position of the joint surface of the divided divided long members to provide the divided long members. By joining and tightening and joining, the divided long members can be joined accurately at the paragraph, and can be evenly distributed in the front and rear even with respect to the press load, and durability can be maintained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. FIG. 1 et seq. Are embodiments of the present invention. As shown in FIGS. 1 and 2, the large-sized press machine 1 is provided with connecting portions 4 and 5 at the front and rear of the upper and lower crowns 2 and both sides of the bed 3, respectively, and a tie rod 6 having a predetermined length is used to make nuts 7 in parallel. Are assembled and disassembled via.

Then, as shown in FIGS. 1 and 2, a slide 8 is fitted between the crown 2 and the bed 3 via a connecting portion 9 to a tie rod 6, and a hydraulic cylinder 10 disposed in the crown 2 portion is used. It can be moved up and down freely. Reference numeral 11 is a pullback cylinder for the slide 8.

The above-mentioned crown 2, bed 3 and slide 8 have a welded structure divided into a plurality of three parts in a symmetrical manner as shown in FIGS. 2 and 3, and divided in the width direction perpendicular to the press forming direction. Each of the divided elongated members 12, 1
3, 14 are joined, and are tied together at predetermined intervals with predetermined tie rods 15, 16, 17 at predetermined intervals to integrally join.

These split connection tie rods 15 and 1
6, 17 are vertically symmetrically arranged on the crown 2, the bed 3, and the slide 8, respectively, and the tie rods 15, 16 and 17 for split coupling are each 1.2 to 1.5 times the normal tightening force. The preload is given and tightened and joined.

The tie rods 15, 16 and 1 for split connection described above.
It is relatively easy and preferable to give a preload to No. 7 by heating with an electric heater or heating with steam to a predetermined temperature, thermally expanding and tightening. However, it can also be performed by tightening with a predetermined force using a hydraulic jack or the like.

Further, the split coupling tie rods 15 and 1 are provided.
It is preferable that the preloading forces of 6 and 17 are greater on both sides of the crown 2, the bed 3 and the slide 8 than on the center side of the crown 2, the bed 3 and the slide 8 in order to balance the supporting force for the press. It is preferable because high accuracy can be maintained against warpage and bending.

Further, the crown 2, the bed 3, the slide 8
Is a long member 1 divided into three as shown in FIGS. 2 and 3.
Paragraph 1 near the neutral line position of the joint surface of 2, 13, 14
8, 19, and 20 are provided, and each divided long member 1
The two, 13, and 14 are joined and joined together to improve the accuracy.

In the manufacturing process, however, the crown 2, the bed 3 and the slide 8 are divided into the elongated members 1 respectively.
It can be handled as 2, 13, and 14, the width and weight can be suppressed, the handleability is good, and it can be performed smoothly and quickly.

Further, even in the assembling, since the width and the weight are suppressed, the handling is good and the carrying is relatively easy, which is preferable.

Further, in press molding, since the divided long members are joined by giving a preload to the above-mentioned split joining tie rods, the crown, bed and slide can be firmly joined together for press forming.

In the above-mentioned embodiment, the crown, bed and slide are divided into three, but it is also possible to divide into two or four or more. However, increasing the number of divisions too much is not preferable in terms of strength and economy.

[0021]

As described above, according to the present invention, the width and weight of large parts of a large press machine can be suppressed within a predetermined range, and they can be easily transported by land or in a factory and processed or assembled. Can be done easily.

Further, even with respect to a large pressing force, the divided long members can be firmly joined by the pre-loaded split connecting tie rods, high precision can be maintained, and press molding can be performed with high durability.

Also, by increasing the preload of the split connecting tie rods on both sides of the split elongated member rather than on the center side, it is possible to properly respond to the component force applied to the crown and the bed and to maintain high accuracy. .

Further, by providing paragraphs near the neutral line position of the joint surface of the divided long members divided into the crown and the bed, the divided long members are joined and tightened to be joined together, whereby the divided lengths are divided at the paragraphs. The length members can be joined with high precision and can be evenly distributed in the front and rear even with respect to the press load, and the durability can be maintained.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention,

FIG. 2 is a side view of the above,

FIG. 3 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

1 ... Large press machine 2 ... Crown
3 ... Bed 6 ... Tie rod 8 ... Slide 12, 13, 14 ... Divided long member 15, 16, 17 ...
Tie rods for split connection 18, 19, 20 ... Paragraph part

Claims (5)

[Claims] 1. A large-sized press device in which a long crown and a bed are connected by a tie rod, and a slide is lifted between the crown and the bed to perform press molding. The bed is divided into multiple pieces in the width direction perpendicular to the press molding direction, the divided long members are joined together, and a preload of a predetermined size is applied to the split tie rods to tighten the divided long members. A method for fastening a large press frame, which is characterized by being joined together. 2. The preload of the split coupling tie rods is 1.2 to 1.5 times the normal tightening force, and the preload of the split coupling tie rods on both sides is larger than the center side of the split elongated member. The method for fastening the large press frame described in. 3. The method for fastening a large press frame according to claim 1, wherein the split connection tie rods are arranged symmetrically with respect to the vertical direction of the crown and the bed. 4. The paragraph and the divided long members are provided near the neutral line position of the joining surface of the divided long members divided into the crown and the bed, and the divided long members are joined and tightened and joined. The method for fastening the large press frame described in. 5. The method for fastening a large press frame according to claim 1, wherein the slides are also divided and joined together.