JPS6025302Y2 - Direct-to-face hydraulic forming equipment using a single-acting deep drawing press - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an opposed hydraulic forming apparatus, and more particularly, to an apparatus for performing direct opposed hydraulic forming by single-acting deep drawing repress.

As a method for processing cylindrical containers of arbitrary shapes from flat plates,
The hydroform method is known, in which a rubber film is stretched over the die opening and the blank is formed by deformation of the rubber film, but since the rubber film is only used to form indirectly and there is no lubrication effect, there are limits to forming. There were disadvantages such as no improvement in the properties of the rubber film, severe wear and tear on the rubber film due to its interaction with the rubber film, and the need to manufacture a rubber film to suit each molded shape.

Therefore, as an alternative method, there is known a opposed hydraulic molding method in which molding is performed while applying hydraulic pressure directly to the blank plate without using a flexible film such as a rubber film.

However, in implementing this method, it is necessary to quickly seal the liquid into the gou before and after molding and take it out from the gou while suppressing the wrinkles in the flange of the blank plate, and the technique is quite difficult, so it is difficult to do so. However, it was not possible to perform opposed hydraulic forming as easily and efficiently as conventional press operations.

In other words, as a device for implementing this method, a single-acting press system can be considered in which a fixed punch and a crease presser with a goo cushion are arranged on the base side, and a goo is arranged on the slide side, but with this structure, the goo hole is Since the mold is opened downward, it is not possible to properly seal the liquid, and a considerable amount of liquid flows out of the apparatus each time the molding is performed.

Furthermore, the liquid is supplied to the goo cavity after the goo comes into contact with the wrinkle presser plate, and air must also be vented, resulting in a problem that efficiency is reduced due to time loss during the molding preparation stage.

For this reason, conventionally, devices for opposed hydraulic molding generally have a structure in which a fixed die is provided on the base side, and a punch and an independent wrinkle presser plate are arranged on the slide side facing the fixed die. was used.

However, with this type of structure, although it is easy to seal in liquid, there are problems in that the structure is complex and an expensive double-acting press is indispensable. There are problems such as the work process becomes complicated because the process involves lowering the blank plate to pinch the flange portion of the blank plate, and then lowering the punch to probe.

This invention was developed after repeated research in view of the above circumstances, and its purpose is to provide a device that can efficiently perform direct facing hydraulic forming using an inexpensive single-action press method. be.

For this purpose, the present invention incorporates a lid member that can be raised and lowered freely with the goo surface as the lower limit in the goo cavity on the slide side.
This lid member is provided with a liquid passage hole that connects the inside and outside of the gou and a valve mechanism that opens and closes the liquid passage hole. Under normal conditions, the valve mechanism shuts off the inside and outside of the gou to prevent liquid from flowing out, and the flow starts when the gou comes into contact with the blank. The liquid hole is opened to generate opposing liquid pressure.

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

Figures 1 to 4 show an embodiment of the opposed hydraulic forming apparatus using a single-acting deep drawing press according to the present invention, in which 1 is a fixed punch protruding from a bolster or bed (hereinafter referred to as a bolster) 3; is a wrinkle pressing plate installed around the fixed punch 1, and a support member 1 passing through the bolster 1.
0, it is supported elastically and movably by a lockable cushion mechanism 4.

A die 5 is fixed to a slide 6 facing the wrinkle pressing plate 2, and can be moved up and down by a main ram 7 by an arbitrary stroke length.

The configuration up to this point is almost the same as the previous single-action press, but
In the present invention, a stepped portion 8 is formed near the shoulder of the die 5, and a closed-bottomed chamber 9 is provided in the deeper part of the stepped portion 8, and a part of this chamber 9 is provided with an external A passage 1 connected to a hydraulic circuit 11 is bored.

Furthermore, a seal pad 13 is slidably installed inside the container chamber 9 via a seal link 14 that is in close contact with the inner wall surface of the container. 8 is provided with a flange portion 15 that can be locked,
The flange portion 15 and the step portion 8 allow the lower surface of the seal pad and the guide face to be flush with each other at the lower limit position.

The seal pad 13 has a lower circumferential portion thereof.
A cutout surface 131 is formed in order to obtain a predetermined gap between the die shoulder and the opening/closing valve mechanism 16 for blocking the container chamber 9 and the outside in a normal state and for communicating the container chamber 9 and the outside in particular during molding. is installed.

Therefore, the on-off valve mechanism 16 may have any structure as long as it has the above function.

For example, in the embodiments shown in FIGS. 2 and 3, a valve hole 17 in which a large diameter hole 171 and a shaft hole 172 are connected is formed in the center of the seal pad 13, and a valve hole 17 is formed in the center of the seal pad 13, and a valve hole 17 is formed in the center of the seal pad 13. On the other hand, a head portion 19 is formed in the valve hole 17 so that the inclination angle of the large-diameter hole 171 almost matches the inclination angle of the large-diameter hole 171.
1 and whose shaft length is moderately larger than the shaft hole 172, and the head 191 of this pin 19 is fixed to the entrance of the large diameter hole 171 through the holed seat 20, and then the spring 21 is inserted. I try to keep it pressed all the time.

Furthermore, in the embodiment shown in FIG.
A valve hole 17 consisting of a large diameter hole 171 and a shaft hole 172 and a liquid passage hole 18 communicating with the shaft hole are formed in the valve hole 1.
A pin 19 biased by a spring 21 is inserted into the pin 19 so that the tip protrudes from the lower surface of the seal pad under normal conditions. It has a structure in which a spool 22 similar to a T-shape is bored to communicate with the liquid passage hole 18.

Furthermore, FIG. 10 shows an embodiment in which a solenoid valve is used as the opening/closing valve mechanism 16, and a watertight case 31 is mounted on a receiving seat 20 with a hole.
The coil 32 and the iron core 33 are fixed in this watertight case 31.
The lower part 330 of the iron core extends through the holed seat 20 and is connected to the head 191 of the pin 19, and the conductor 34 is led from the coil 32 and connected to an electric circuit.

With this structure, in the normal state (when not energized), the pin 19 is placed in a lowered state by the spring 21,
When the coil 32 is energized by a conductor during opposed hydraulic forming, the pin 19 rises against the elasticity of the spring as the iron core 33 rises, thereby communicating the chamber 9 and the liquid passage hole 18. be.

Next, the hydraulic circuit 11 includes a liquid tank 23, a pump 24 for feeding liquid into the passage 12, and a check valve 25.
and a relief valve 26 for returning the liquid in the chamber to the liquid tank 23 when the set pressure is reached.

In other countries, 27 is the piston of the Gui cushion mechanism 4, 28 is the oil seal attached to the surface of the die 5, 29 is the seal ring attached to the lower surface of the seal pad, 3
Reference numeral 0 denotes a liquid receiving tray arranged to surround the lower part of the wrinkle presser plate 2, and is connected to the liquid tank 23 by a circuit (not shown).

Next, the opposed hydraulic molding method using the device of the present invention will be explained.

. FIGS. 5 to 9 show the forming process step by step. The blank (W) is set on the wrinkle holding plate 2, and the pump 24 is driven with the die 5 raised to the top dead center.

By driving this pump 24, a liquid (for example, oil) for opposed hydraulic molding flows into and fills the chamber 9 through the hydraulic circuit 11 and the passage 12, and the seal pad 13 is filled with this inflow liquid.
is pressed from the back and descends into the chamber, and is stopped near the die entrance by the collar 15.

At this time, the seal pad 13 has a seal ring 14 on the outer peripheral surface.
The seal ring 14 slides on the inner circumferential wall of the container chamber 9, and the opening/closing valve mechanism 16 also stops operating to close the liquid passage hole 18 (in the embodiment, the pin protrudes). The liquid in the container does not flow out, and preparations for opposing hydraulic pressure restriction are quickly completed.

(Situation shown in Figure 5) Next, when the slide 6 is operated by the main ram, the dice 5 is lowered, and the chamber 9 whose entrance is closed by the on-off valve mechanism 16 is also lowered, and then the guiface becomes blank (W). Blank (W) in contact with wrinkle presser plate 2
')' flange part (W') is clamped.

At this time, the lower surface of the seal pad 13 also comes into contact with the blank (W), and the opening/closing valve mechanism 16 is actuated by the bending to open the liquid passage hole 18.

This is the state shown in FIG.
9 contacts the blank (W) and is pushed up against the elasticity of the spring 21, thereby communicating the liquid passage hole 18 with the chamber 9.

As a result, the liquid sealed in the container flows out of the seal pad through the valve hole 17 and the liquid passage hole 18, but since the seal pad 13 has a cut surface 131 on the shoulder, as shown in FIG. 6a, It fills up around the shoulder of the die.

Note that, even at this stage, the pump 24 continues to supply liquid.

If the die 5 continues to descend further from the above state, opposing hydraulic pressure will be generated in the liquid filled around the die shoulder, and the blank (W) will be held against the fixed punch 1 by the frictional restraining force caused by the addition of this opposing hydraulic pressure. As the die 5 and the fixed punch 1 come into close contact with each other and the degree of engagement between the die 5 and the fixed punch 1 increases, opposing hydraulic squeezing is started.

The flange portion (W') of the blank is sandwiched between the wrinkle presser plate 2 which is being pushed down and the guide face, and is pulled out while being lubricated by the opposing hydraulic pressure.

This is the state shown in Fig. 7a, and the seal pad 13 is moved back into the chamber by the fixed punch 1 being press-fitted into the die 5, and as a result, the liquid in the chamber is discharged from the chamber wall, the outer wall of the punch, and the lower surface of the seal pad. continues to flow into the enclosed void,
When the predetermined liquid pressure set in the relief valve 26 is reached, the liquid is sequentially returned to the liquid tank 23 through the passage 12, and the narrowing by the opposing liquid pressure is completed as shown in FIG.

When the narrowing is completed in this manner, the goo cushion mechanism 4 is once locked at the bottom dead center, and then the die 5 begins to rise by the main ram, and during this time, the liquid feeding is interrupted by a limit switch (not shown).

As the die 5 continues to rise, the seal pad 13 housed in the chamber 9 of the die also begins to rise along with the die due to frictional force, and the lower surface of the seal pad separates from the punch surface.

This causes the on-off valve mechanism 16 to operate, closing the liquid passage hole 18 and sealing the chamber again.

That is, in this embodiment, the pin 19 is lowered by the pressing force of the spring 21, and the head 191 blocks the liquid passage hole 18.

This is the state shown in FIG. 8, and when the liquid passage hole 18 is closed and the die surface reaches above the punch surface, the limit switch causes the liquid to be fed into the chamber again.

Then, when the main ram reaches the top dead center, the Gui cushion mechanism 4 is unlocked, the wrinkle presser plate 2 is raised, and the ninth
The product is taken out as shown in the figure.

During this time, the chamber 9 is filled with liquid, and the seal pad 13 is lowered to a predetermined position.

With the above, one round of forming operation is completed, and after that, the blank (W) is set on the wrinkle presser plate 2 and the main ram is lowered to immediately perform the next opposed hydraulic forming operation.During forming, the fixed punch 1 The liquid remaining in the small gap between the chambers of the die and the die is stored in the liquid receiver 30, so there is almost no waste.

Further, the pump 24 of the hydraulic circuit has an output of, for example, 5ko
A low pressure specification such as /crl or less is sufficient.

According to the present invention explained above, the fixed punch 1,
A wrinkle pressing plate 2 supported by a cushion mechanism 4 around the fixed punch 1, and a die 5 facing the wrinkle pressing plate 2 and raised and lowered by a main ram are provided. A container chamber 9 is formed which communicates with the hydraulic circuit 11, and the container chamber 9 has a liquid passage hole 1 which can be raised and lowered along the inner wall of the chamber and which communicates with the inside and outside of the container chamber.
8, and this seal pad 13 is provided with an on-off valve mechanism 16 that blocks the liquid passage hole 18 in normal state and opens the liquid passage hole 18 during molding to allow the liquid in the container to flow in and out. Therefore, it was difficult to seal the liquid in the tipping chamber, which is a problem when performing direct opposed hydraulic forming with a single-action press.
The liquid can be automatically and easily and quickly taken in and out of the blank from the chamber according to the forming stroke, and this improves the forming limit due to the frictional restraint of the material on the punch shoulder and the lubrication effect on the die surface. Sharp molding with extremely good dimensional accuracy can be performed efficiently and smoothly using a simple single-action press, and excellent effects such as a simple structure and low cost can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing an embodiment of a direct facing hydraulic forming device using single-acting deep drawing repress according to the present invention, Fig. 2 is a cross-sectional view showing details of the seal pad in the same invention, The figures are also bottom views, Figures 4a and 4b are cross-sectional views showing other embodiments of the seal pad before and after the molding process, and Figures 5 to 9 show the molding process using the device of the present invention step by step. 6a is an enlarged view showing a state in which the on-off valve mechanism is in operation, and FIG. 10 is a sectional view showing an embodiment using a solenoid valve as the on-off valve mechanism of the present invention. 1...Fixed punch, 2...Wrinkle press plate, 4...Gui cushion mechanism, 5...
Dice, 9... Container, 11... Hydraulic pressure circuit, 12... Passage, 13... Seal pad, 16... Open/close Valve mechanism, 17...
Valve hole, 18...Liquid passage hole, 19...Zen.

Claims (1)

[Claims for Utility Model Registration] ■ A fixed punch 1, a wrinkle presser plate 2 supported by a Gui cushion mechanism 4 around the fixed punch 1, and a wrinkle presser plate 2 that is raised and lowered by a main ram in opposition to the wrinkle presser plate 2. A chamber 9 is formed in the die 5 and communicates with an external hydraulic circuit 11 through a passage 12, and the chamber 9 is movable up and down along the inner wall of the chamber 9 and communicates with the inside and outside of the chamber. A seal pad 13 having a liquid passage hole 18 is installed inside the seal pad 13, and the liquid passage hole 1 is provided in the seal pad 13 in a normal state.
A direct opposing hydraulic forming apparatus using a single-acting deep drawing repress, characterized in that it is provided with an on-off valve mechanism 16 which shuts off the liquid flow hole 8 and opens the liquid passage hole 18 during molding to allow liquid in the container to flow in and out. 2. The opening/closing valve mechanism 16 is inserted with its head into the center hole 17 of the seal pad that communicates with the liquid passage hole 18, and the pin 19 is biased so that its tip protrudes from the lower surface of the seal pad in normal state. A direct opposed hydraulic forming apparatus using a single-acting deep drawing press according to claim 1, which has the following features: 3. The opening/closing valve mechanism 16 includes a pin 1 which is provided with a spool 22 that can fit into the liquid passage hole 18 when leaving the machine, and which is normally biased so that its tip protrudes from the lower surface of the seal pad.
9. A direct facing hydraulic forming apparatus using a single-acting deep drawing press according to claim 1 of the utility model registration claim. 4. The direct opposing hydraulic forming apparatus using a single-acting deep drawing press according to claim 1, wherein the opening/closing valve mechanism 16 is a solenoid valve.