JPH0416278B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ultra-high pressure hydraulic molding machine.

[Conventional technology and its technical issues]

When drawing or bulging large parts at ultra-high pressures such as 30,000 to 100,000 tons, if the forming machine adopts a general portal frame structure, the frame The structure becomes extremely large and the manufacturing cost increases significantly.

Conventionally, cylindrical frames that do not receive bending stress have been adopted, especially endless frame types. Inside this endless frame, a diaphragm (rubber membrane) that is held liquid-tight at both ends by a sealing mechanism is placed, and from behind it The structure was such that high-pressure fluid was applied to press the work against the punch.

However, this configuration has the problem that not only is indirect molding performed through an inclusion called a rubber film, but also that the wrinkle pressing force cannot be adjusted, resulting in insufficient moldability and difficulty in creating deep or sharp shapes. .

The present invention was devised to solve the above-mentioned problems, and its purpose is to use this type of ultra-high pressure hydraulic system that can easily process large products with good moldability. Our goal is to provide molding machines.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an upper frame and a lower frame whose outer surfaces are in close contact with the inner surface of the outer frame inside an outer frame whose inner surface has a circular cross section, A hydraulic dome communicating with a hydraulic pressure supply source and a die are provided on the outside of the dome, and the upper frame is provided with a wrinkle pressing mechanism facing the die, while the outer frame is provided with an inner cylinder facing the hydraulic dome. The upper frame should be fixed, and the upper frame should have a built-in punch connected to the ram of the inner cylinder, and the upper frame should be in the movement area of the ram, retreating normally and advancing behind the punch at the end of forming. It is equipped with a hydraulic restrike mechanism consisting of an insert block and a locking cylinder that moves it forward and backward.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a opposed hydraulic molding machine. 1a is an upper half frame, and 1b is a lower half frame. In this embodiment, each has a hemispherical or semielliptic spherical shape, and by combining the upper half frame 1a and the lower half frame 1b, a spherical, ellipsoidal or cylindrical shape can be formed. outer frame 1
It has come to consist of

The upper half frame 1a and the lower half frame 1b are provided with radial reinforcing ribs 13, 13 on their outer peripheral surfaces, and have flanges 12, 12 on the outer edge of the joint, and these flanges 12, 12 have radial reinforcing ribs 13, 13 on their outer peripheral surfaces. Notches 120, 120 are formed at equal intervals, and a tightening bolt 14 for maintaining the necessary forming force is provided at a position corresponding to the notches 120, 120 so as to be tiltable with one end as a fulcrum. An inner cylinder 4 is fixed to the upper part of the upper half frame 1a.

2 is the upper frame, 3 is the lower frame,
Each outer surface has a curved shape, and the upper frame frame 2 is attached to the inner surface of the upper half frame 1a, and the lower frame frame 3 is attached to the inner surface of the upper half frame 1a.
are installed so as to be in close contact with the inner surface of the lower half frame 1b.

The lower frame 3 is provided with a hydraulic dome 9 that opens on the upper surface, and a die 90 is provided on the outside of the hydraulic dome 9.
is provided. A hydraulic port 91 communicates with the lower part of the hydraulic dome 9, and the hydraulic port 91 passes through the lower half frame 1b and is connected to an external counter hydraulic pressure supply/control device A via piping.

The upper frame frame 2 has a guide space 20 at a position corresponding to the inner cylinder 4 of the upper half frame 1a.
On the other hand, a punching cavity 21 is provided on the lower surface so as to face the hydraulic dome 9. A punch 6 having a desired shape is arranged in this punch cavity 21, and a mounting block 60 on the back of the punch 6 extends into the guide cavity 20 and is rigidly connected to the ram (piston rod) 40 of the inner cylinder 4. There is.

Further, the upper frame 2 is provided with a plurality of wrinkle presser cylinders 5, 5 on the outer side of the punching space 21, that is, the portion facing the die 90, and each of the wrinkle presser cylinders 5, 5 is provided with a plurality of wrinkle presser cylinders 5, 5. Hydraulic pressure ports 51, 51 passing through the upper frame frame 2 and the upper half frame 1a are provided in the upper part, and these hydraulic ports 51, 51 are connected to an external wrinkle presser hydraulic pressure supply/control device B through piping. There is. Further, each wrinkle presser cylinder 5, 5 has a ram 70,
70 are disposed, and an annular presser plate 7 is integrally provided below the rams 70, 70.

Then, a plurality of insert blocks 1 are placed in the guide cavity 20 in order to perform hydrorestriking at the final stage of molding and take out a sharp shape.
0 and 10, and a locking cylinder 1 for advancing and retracting insert blocks 10 and 10 into a space provided through a guide space 20 and a partition wall.
1 and 11 are arranged. When this additional device is used, the insert blocks 10, 10 are inserted between the inner cylinder 4 and the ram head by the operation of the locking cylinders 11, 11, so that it is possible to prevent the punch 6 from floating during hydro restriking.

FIGS. 2a, b, and c show the frame shapes according to the embodiment shown in FIG. 1, which may be spherical, ellipsoidal, oblong spherical, or cylindrical as shown in c.

3 to 5 show an embodiment in which the present invention is applied to an endless frame type with upper and lower moving devices.

In this embodiment, the outer frame 1 is a cylindrical integral frame and is fixed to a base 100. On both sides of the outer frame 1 in the longitudinal direction, frames 104 and 105 with rollers are disposed with phases shifted in the height direction. Inside the outer frame 1, there is an upper frame frame guide 102, 1 with rollers at the same level as the upper frame 104 with rollers.
02 is fixedly installed, while the lower roller frame 10
Lower frame frame guides 103, 103 with rollers are fixedly installed at the same level position as 5.

An upper frame frame 2 having a split circular cross section is disposed on the upper frame with rollers 104, and a lower frame frame 3 having a split circular cross section is disposed on the lower frame with rollers 105. 2,
3 slides on the rollers and is inserted into the outer frame 1, so that the upper and lower frame guides 1
02, 102, 103, and 103, and the outer surface is in close contact with the inner surface of the outer frame 1.

The lower frame frame 3 is provided with a hydraulic dome 9 and dies 90, 90 on both sides thereof, as in the embodiment of FIG. Further, the upper frame frame 3 has a built-in wrinkle pressing mechanism on both sides of the lower surface. For these, only the same symbols are shown.

On the other hand, a plurality of inner cylinders 4 (two in the drawing) are fixedly mounted on the upper part of the outer frame 1, and a ram 40 having a dovetail-like protrusion 41 projects inward from the inner cylinders 4. There is.

A groove 33 that substantially matches the shape of the ram 40 is formed in the upper frame 2 in the longitudinal direction (see FIG. 5), and a guide cavity 20 is formed in a portion that matches the ram 40 in the axial direction. A block 60 protruding from the punch 6 is housed in this guide cavity 20. An engagement groove 61 like a dovetail groove corresponding to the protrusion 41 of the ram 40 is formed in the upper part of the block 60.
The force is transmitted between the punch 6 and the inner cylinder 4 by the restraining action of the engagement groove 61.

Further, fall prevention grooves 62 are formed on both sides of the block 60, and each insert block 10, 10 in the guide cavity 20 is provided with a protrusion 101 that can fit into the fall prevention groove 62. . Therefore, in this embodiment, the insert blocks 10, 10 exhibit the function of preventing punches from rising during hydrorestriking, and the function of preventing punches from falling when the upper frame frame 2 is moved or taken out from the outer frame 1.

[Effect of the embodiment]

In the embodiment of FIG. 1, the blank W is placed on the die 90 of the lower frame 3. In the embodiment of FIG. and,
Liquid is filled into the hydraulic dome 9 from the opposing hydraulic pressure supply/control device A through the hydraulic port 91, while from the wrinkle presser hydraulic pressure supply/control device B to the hydraulic port 5.
Hydraulic pressure is supplied to the crease presser cylinders 5, 5 via 1, 51. As a result, the peripheral portion of the blank W is held between the die 90 and the blank W.

If the inner cylinder 4 is operated in this state, the mounting block (or bracket) 60 will move down the guide cavity 20 in the upper frame 2 due to the extension of the ram 40, and therefore the punch 6 will also move into the punch cavity 2.
1 to come into contact with the blank W and push it into the hydraulic dome 9. This generates or increases the opposing hydraulic pressure, and the blank W is wound around the punch 6.

The counter hydraulic pressure acts directly on the blank W and is independent of the counter hydraulic pressure, the wrinkle presser hydraulic pressure supply/control device B
Since the pressure of the wrinkle presser cylinders 5, 5, that is, the wrinkle presser force, can be freely adjusted by the hydraulic pressure from the presser, the drawability is good and even complex shapes can be formed accurately.

In order to create a sharper shape, the locking cylinders 11, 11 are operated at the end of the molding stage, and in this state, opposing hydraulic pressure increased to ultra-high pressure is sent from the hydraulic pressure port 91. , 11, the insert block 10 advances as shown in the right half of FIG. It does not float up and allows for proper hydro restrike.

Once the molding is completed, the hydraulic ports 51, 91
The hydraulic pressure is released from the punch 6, and the punch 6 is pulled up to the top dead center by the inner cylinder 4 as shown in the left half of FIG. Then, all the tightening bolts 14, 14 are loosened and tilted through the notches 120. This releases the connection between the upper half frame 1a and the lower half frame 1b, so either lift the upper half frame 1a with a crane or the like, rotate the upper half frame 1a horizontally, or tilt it using one of the flanges as a fulcrum. let Upper frame frame 2 is upper half frame 1
Since it moves together with a, the lower frame frame 3 is exposed,
Therefore, the molded product can be easily taken out. So all that's left to do is place a new blank on dice 90,
The upper half frame 1a is again put together with the lower half frame 1b, fastened and combined with the tightening bolts 14, 14, and the next molding operation is started.

In the embodiments shown in FIGS. 3 to 5, the blank W is mounted on the lower frame 3, and in this state, the lower frame 3 is attached to the outer frame 3 via the lower roller mount 105 and the frame guides 103, 103. inserted inside. Similarly, upper frame frame 2
is inserted into the outer frame 1 via the mount 104 with upper rollers and the frame guides 102, 102.

At this time, the ram 40 protrudes into the outer frame 1, but there is no problem because the upper frame frame 2 has a groove 33 of the same shape running in the longitudinal direction, and it reaches just below the inner cylinder 4. Incidentally, a mounting block 60 is fitted onto the ram 40. During this time, insert the protrusion 101 of the insert block 10 into the fall prevention groove 62 on the side surface of the mounting block 60.
are fitted, so the punch 6 is attached to the upper frame frame 2.
It is integrated with.

Once the ram 40 and the mounting block 60 are in the combined state as described above, the insert block 10 is moved back by the locking cylinder 11. When the inner cylinder 4 is actuated, the punch 6 is lowered and the blank W is pushed into the hydraulic dome 9 to perform opposed hydraulic forming. At this time, since hydraulic pressure is being sent from the hydraulic ports 51, 51 to the wrinkle presser cylinders 5, 5, an appropriate variable wrinkle presser force is applied regardless of the opposing hydraulic pressure, as in FIG.

Then, when performing hydrorestriking using ultra-high pressure at the final stage of molding, the locking cylinder 11 is operated again. At this time, the mounting block 60 is lowered, so the insert block 1
0 is inserted between the inner cylinder 4 and the mounting block 60 to prevent the punch 6 from floating due to the reaction force of the ultra-high pressure.

In addition, in the embodiment shown in FIG. 1, if a female mold is attached in place of the punch 6, ultra-high pressure hydraulic bulge forming can be performed into a desired shape.

〔Effect of the invention〕

According to the present invention described above, an upper frame 2 and a lower frame 3 whose outer surfaces are in close contact with the inner surface of the outer frame 1 are arranged inside the outer frame 1 whose inner surface has a circular cross section, and inside the lower frame A hydraulic dome 9 that communicates with an external hydraulic pressure supply source and a die 90 are provided on the outside thereof, and the upper frame frame 2 is provided with a wrinkle holding mechanism that opposes the die 90, so that the circular cross section is free from bending stress. The frame makes it possible to directly face hydraulic molding under ultra-high pressure due to its compact structure.
An inner cylinder 4 is fixed to the outer frame 1 facing the hydraulic dome 9, and a punch 6 connected to the ram 40 of the inner cylinder 4 is built into the upper frame 2. In the movement area of the ram 40, a hydro restrike mechanism is provided, which consists of insert blocks 10, 10 which are normally retracted and are to be advanced behind the punch 6 at the end of forming, and locking cylinders 11, 11 which advance and retreat the insert blocks. Therefore, when the hydraulic pressure in the hydraulic dome is increased at the end of molding, lifting of the punch 6 due to the reaction force is controlled, and the compact structure allows large parts to be produced at extremely high pressures of 30,000 to 100,000 tons. It has the excellent effect of being able to be processed into deep or sharp shapes.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of an embodiment in which the present invention is applied to an opposed hydraulic molding machine, showing the state from the start of molding to the final stage of molding with the center line as the border, and Fig. 2 a, b, and c are frames according to the present invention. FIG. 3 is a side view showing an embodiment in which the present invention is applied to an endless type hydroforming machine, FIG. 4 is a sectional view taken along the line of FIG. 3, and FIG. FIG. 1... Outer frame, 1a... Upper half frame,
1b... lower half frame, 2... upper frame frame, 3
...Lower frame frame, 4...Inner cylinder, 5...
...Wrinkle holding cylinder, 6...Punch, 6'...Female mold, 7...Wrinkle holding plate, 9...Hydraulic dome, 10
...Insert block, 11...Lock cylinder.

Claims (1)

[Claims] 1. Outer frame 1 with at least an inner surface having a circular cross section.
An upper frame 2 and a lower frame 3 whose outer surfaces are in close contact with the inner surface of the outer frame 1 are arranged inside the frame, and within the lower frame there is a hydraulic dome 9 that communicates with an external hydraulic pressure supply source and a die on the outside thereof. 90, and the upper frame 2 is provided with a wrinkle pressing mechanism facing the die 90, while the inner cylinder 4 is fixed to the outer frame 1 facing the hydraulic dome 9. Inner cylinder 4 ram 40
Insert blocks 10, 10, which are normally retracted in the movement area of the ram 40 and are to be advanced behind the punch 6 at the end of molding, and the insert blocks 10, 10, which are moved forward and backward, are built into the upper frame frame 2. An ultra-high pressure hydraulic molding machine characterized by being equipped with a hydro restrike mechanism consisting of locking cylinders 11, 11. 2. The ultra-high pressure hydraulic forming machine according to claim 1, wherein the outer frame 1 is divided into two parts, an upper half frame 1a and a lower half frame 1b, which are integrated by tightening bolts 14. 3. Claim 1 includes an outer frame 1 having a cylindrical shape, and an upper frame 2 and a lower frame 3 having a split circular cross section that can be inserted into and removed from the outer frame 1. ultra-high pressure hydraulic molding machine.