JPS6222266Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single-acting, counter-hydraulic press, and particularly to a direct-opposing, hydraulic, single-acting press that applies hydraulic pressure directly to a blank plate.

As a method for processing cylindrical containers from flat plates, the opposed hydraulic forming method is known, in which forming is performed while applying hydraulic pressure directly to the blank plate, which greatly improves the forming limit and allows the production of products with complex shapes. It has the feature of being able to be molded with high precision.

However, when implementing this method, a special double-acting press equipped with an inner press for raising and lowering the punch and an outer press for raising and lowering the wrinkle holding plate is indispensable, resulting in an expensive equipment. proposed, in Utility Model Application No. 55-91969, an opposing hydraulic device including a hydraulic dome attached to the lower part of the slide of a single-acting press with a dictation.

According to this device, opposing hydraulic pressure forming can be performed with a single-acting press, but the opposing hydraulic device protrudes significantly downward from the slide, which lengthens the upward stroke of the slide when taking out the product. ) became larger, and there was a problem that it was difficult to obtain a large drawing depth.

The present invention is a compact device that further improves the above-mentioned device and allows the press daylight to be made smaller, the drawing depth to be larger even with the same daylight, and the punching force, that is, the force of the main ram, to be reduced. The aim is to provide a practical single-acting opposed hydraulic press that is highly resource- and energy-saving.

In order to achieve this objective, the present invention changed the idea and built a hydraulic chamber into the slide itself that is lifted and lowered by the main ram, and a movable plug equipped with a flow path opening/closing valve is placed inside this hydraulic chamber so that it can be lifted and lowered. , and the movable plug functions as an output reduction mechanism for the main ram, that is, a fixed punch is provided on the bed side, and a wrinkle presser plate supported by a dicing mechanism is provided around this, and the movable plug is raised and lowered by the main ram. A die for holding the blank between the wrinkle press plate and the slide to be molded is provided, and a dome body with the bottom facing upward is built into the slide, and the dome body is filled with the liquid sealed in the hydraulic pressure chamber in the dome during molding. A movable plug equipped with an on-off valve that allows flow to flow into an annular pressurizing chamber surrounding the punch shoulder is arranged so as to be movable up and down.Moreover, the movable plug is equipped with a sealing material that contacts the blank on its lower surface, and a dome body is attached to the rear of the movable plug. It is characterized in that a ram body is provided that penetrates through the bottom, and the distance between the outer circumferential surface of the ram body and the inner wall of the dome is larger than the distance from the sealing material to the outer diameter of the punch.

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

Figures 1 to 6 show an embodiment of the single-acting opposed hydraulic press according to the present invention, in which 1 is a punch fixed to a bolster 3 or base plate 3' on the bed side, 2 is a punch fixed to a bed side bolster 3 or a base plate 3'; Bolster 3 or base plate 3'
It is supported elastically and movably up and down by a dictation mechanism 9 via a cushion pin 10 passing through it.

4 is the bolster 3 or base plate 3'
It is a slide (slide ram) disposed on the press crown side facing the press crown, and is moved up and down by the main ram 5 while being guided by a press side frame (not shown) on both sides.

Such a configuration is almost the same as a general single-action press, but the present invention has a hydraulic chamber 6 built into the slide 4, and a movable plug 7 and a molding unit that cooperate with the hydraulic chamber 6. It is equipped with an on-off valve 8 for causing the liquid sealed in the hydraulic pressure chamber to flow out and act on the outer surface of the blank W.

The hydraulic chamber 6 is a bottomed hole having a suitably larger inner diameter than the punch 1, and is provided in the center of the slide 4. Specifically, the dome body 6a is fitted into the frame 41 constituting the slide 4, and held and fixed with the fixing fittings 42. The hydraulic chamber 6 is shown in Figs. 1 and 4.
As shown in the figure, the relief valve 11 for setting the opposing hydraulic pressure
1 and a hydraulic circuit 11 comprising a pump 112.

A stopper plate 12 is fixed to the lower surface of the slide corresponding to the outlet side of the hydraulic pressure chamber 6 so that its inner side protrudes moderately toward the hydraulic pressure chamber, and the lower surface of the stopper plate 12 is aligned with the lower surface of the slide. are doing. A die 1 that clamps the blank W with the wrinkle pressing plate 2 is provided on the lower surface side of the stopper plate 12.
3 is removably fixed.

The movable plug 7 is movable up and down along the side wall of the hydraulic chamber 6, and has a stepped portion 71 that abuts the stopper plate 12 in the middle of the side. The lower side of this stepped portion 71 has a diameter so as to form an annular pressurizing chamber A between the inner diameter surfaces of the stopper plate 12 and the die 13 during molding, as shown in the right half of the paper of FIG. A small portion 72 is formed, and a sealing material 14 that is in contact with the upper surface of the blank W is provided on the lower surface. This sealing material 14 is used to prevent hydraulic pressure from entering into the inner diameter side from the punch shoulder during molding and reduce the drawing force, and may be an O-ring as shown in the figure, or may be an O-ring in some cases. It may be a rubber plate or sheet, and by removing this sealing material 14, normal opposed hydraulic molding is performed.

The movable plug 7 is provided with a ram body 73 at the center of the top that penetrates the hydraulic pressure chamber 6 in order to double as an output reducing ram. A space is formed that allows 73 people to go up and down. The distance l ₁ from the outer peripheral surface of the ram body 73 to the inner wall of the hydraulic pressure chamber and the distance l ₂ from the center of the sealing material 14 to the outer diameter of the punch have a relationship of l ₁ > l ₂ , and due to the differential pressure due to this relationship, The movable plug 7 is pressed in the direction of the punch by the hydraulic pressure sealed in the hydraulic chamber 6.

The on-off valve 8 may have any structure as long as it has the function of shutting off the hydraulic pressure chamber 6 and the outside in a normal state and allowing communication between the hydraulic pressure chamber 6 and the outside during molding. 1 and 2 show an embodiment in which a plurality of movable plugs are provided near the periphery of the hydraulic chamber 6.
A liquid passage hole 15 is formed in the top part 74 of the movable plug 7 facing toward
61 is formed, and a through hole 17 passing through the small diameter portion 72 is formed in the lower part of the valve chamber. A valve body 18 having a head 181 in contact with the valve seat 161 and a shaft 182 passing through the movable plug 7 is inserted into the valve chamber 16, and a spring 19 installed in the upper part of the valve chamber keeps the valve seat 161 The closed state is obtained by bringing the head 181 into contact with the body under a predetermined pressure.

In the embodiments shown in FIGS. 4 and 5, the on-off valve 8 is placed in the center.
The lower end of the movable plug 7 is aligned with the lower surface of the stopper plate 12 and the lower surface of the slide. A tip member 21 is removably attached. In order to operate the valve body 18, a plurality of grooves 210 are formed in the tip member 21 radially from the center, and a push plate 22 that can come into contact with the shaft portion 182 of the valve body 18 is installed inside these grooves. A valve push rod 23 protruding from the tip member 21 is attached to the plate 22. Of course, this structure may be applied to the embodiments of FIGS. 1 and 2.

The embodiment shown in FIG. 6 shows an embodiment in which the on-off valve 8 is an electromagnetic valve, in which a sealed case 26 containing a coil 25 is attached to the movable plug, and an iron core 27 is inserted through the liquid passage hole 15. This iron core 27
The lower end of the valve body 18 is continuous with the valve body 18. In this case, the shaft portion of the valve body 18 does not necessarily need to protrude from the lower end of the movable plug.

In other drawings, 28 is an oil pan.

Next, the usage and operation of the press of the present invention as described above will be explained.

In facing hydraulic forming, the blank W is set on the wrinkle holding plate 2, and the pump 112 is driven to seal liquid such as oil from the hydraulic circuit 11 into the hydraulic chamber 6 in the slide. As a result, the movable plug 7 descends through the hydraulic pressure chamber 6, and the stepped portion 71 moves toward the stopper plate 12.
By coming into contact with the die, it comes to rest at a position aligned with the lower surface of the die as shown in FIGS. 1 and 4.

Next, when the slide 4 is lowered by the main ram 5, the hydraulic chamber 6 and the movable plug 7 built into the slide 4 are also lowered together, and then the lower surface of the die comes into contact with the blank W and the wrinkle presser plate 2. Clamp the flange of blank W with. At this time, the lower surface of the movable plug 7 also comes into contact with the blank W, and the on-off valve 8 operates to open, allowing the high-pressure liquid in the hydraulic chamber 6 to flow from the liquid passage hole 15 to the passage hole 17.
After that, it begins to flow out.

That is, in the embodiment shown in FIG. 2, the shaft portion 182 of the valve body 18 is pressed against the blank W, thereby causing the valve body 18 to rise against the elasticity of the spring 19.
The head 181 is separated from the valve seat 161. In the embodiment shown in FIG. 5, the valve pushing rod 23 is pressed by the blank W, and the pushing plate 22 moves up in the groove, thereby causing the valve body 1
8 receives pressure and the head 181 separates from the valve seat 161. In the embodiment shown in FIG. 6, when the shaft portion 182 comes into contact with the blank W, the coil 25 is energized from an electric circuit (not shown), thereby causing the valve body 18 to rise via the iron core 27.

The high pressure liquid that has flowed out from the hydraulic pressure chamber 6 as described above fills the annular pressurizing chamber A between the die 13 and the movable plug 7, that is, the vicinity of the die shoulder. And pump 11
If the slide 4 is further lowered while continuing the liquid feeding in step 2, the blank W is pressurized by the liquid in the annular pressurizing chamber A and comes into close contact with the fixed punch 1, and the die 13 and the fixed punch are connected as shown in FIG. As the degree of fitting with 1 increases, opposing vacuum molding progresses. At this time, the flange of the blank W is pulled out while being held between the wrinkle presser plate 2, which is being pushed down, and the lower surface of the die.

As the opposed hydraulic forming as described above progresses, the movable plug 7 retreats into the hydraulic pressure chamber within the slide, and when the hydraulic pressure reaches a predetermined pressure set in the relief valve 111, the liquid is returned to the tank.

When the slide 4 starts to rise after molding is completed, the movable plug 7 moves up along with the slide 4, and as the lower surface of the movable plug separates from the product, the on-off valve 8 is activated and the gap between the through hole 17 and the hydraulic chamber 6 is activated. At the same time, oil is supplied to the hydraulic pressure chamber 6, and the movable plug 7 is lowered to the position shown in FIG.

When the main ram 5 reaches the upper pressure point, the dictation mechanism 9 is unlocked and the wrinkle presser plate 2 rises.
The product is taken out and one molding operation is completed. At this time, in the present invention, the hydraulic chamber 6, movable plug 7, and on-off valve 8 that constitute the opposed hydraulic device do not protrude from the lower surface of the slide, but are built into the slide 4, so that the slide for taking out the product The ascent distance is small, and daylight is lowered accordingly. As a result, the device becomes more compact, and the drawing depth can be increased even with the same daylight, making it possible to easily form deep containers.

Furthermore, in the present invention, a sealing material 14 is attached to the lower surface of the movable plug 7 in contact with the blank, and
A ram body 73 that penetrates the bottom of the dome body 6a is provided at the rear, and the distance l ₁ between the outer peripheral surface of the ram body 73 and the inner wall of the dome is equal to the distance l ₂ from the sealing material to the outer diameter of the punch.
Since the movable plug 7 also serves as an output reducing ram at the same time, the punching force is reduced, thereby reducing the output of the main ram 5 and achieving appropriate energy savings. In other words, in the normal opposed hydraulic forming method, opposed hydraulic pressure acts on the zone inside the punch shoulder, and this opposed hydraulic pressure acts as a reaction force of the punch and only increases the drawing force and does not contribute to improving the forming limit. .

In the present invention, a sealing material 14 is attached to the lower surface of the movable plug 7, and a ram body 73 is connected to the movable plug 7. Therefore, molding progresses while the movable plug 7 is pressed against the blank W with the required pressure due to the pressure inside the hydraulic chamber 6 due to the differential pressure caused by the area difference shown in FIG. Blocks hydraulic pressure from entering. Therefore, unnecessary reaction force is not exerted, and the sliding downward pressure caused by the main ram 5 can be reduced accordingly. In addition, if there is no need to reduce the squeezing force,
The seal 14 may be removed from the movable plug 7 in advance.

Further, when the tip member 21 equipped with the valve push rod 23 and the push plate 22 is provided below the movable plug 7 as shown in FIGS. 4 and 5 to operate the on-off valve 8, Slide 4 is removed by loosening bolt 20 and removing tip member 21 and removing die 13.
The bottom surface of will be flat. Therefore, by attaching a mold to the lower surface of the slide 4, conventional mold molding can be easily performed with the counter hydraulic device built-in.

According to the present invention as described above, a fixed punch 1 and a wrinkle presser plate 2 supported around the fixed punch 1 by a dicing mechanism 9 are provided on the bed side, and the wrinkle presser plate 2 is attached to the slide 4 which is raised and lowered by the main ram 5. A die 13 is provided to sandwich the blank,
Inside the slide 4, there is a dome body 6 with the bottom facing upward.
A is built into the dome body 6a, and a movable plug 7 equipped with an on-off valve 8 that allows the liquid sealed in the dome internal hydraulic pressure chamber 6 to flow out into the annular pressurizing chamber A surrounding the punch shoulder during molding is arranged so as to be able to rise and fall. Therefore, it is possible to fully utilize the advantages of single-acting direct facing hydraulic forming while reducing the open height and improving the drawing depth.Moreover, the movable plug 7 has a sealing material 14 on the lower surface that contacts the blank. At the same time, a ram body 7 that penetrates the bottom of the dome body 6a is attached to the rear part.
3, and the distance l ₁ between the outer peripheral surface of the ram body 73 and the inner wall of the dome is configured to be larger than the distance l ₂ from the sealing material to the outer diameter of the punch. The movable plug 7 can also function as an output reduction mechanism for the main ram at the same time, thereby eliminating loss due to unnecessary reaction force and making it possible to downsize the main ram. Excellent effects such as making the device more compact and reducing costs can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing an embodiment of the single-acting opposed hydraulic press according to the present invention, Fig. 2 is a partially enlarged view thereof, and Fig. 3 is a molding by the single-acting opposed hydraulic press of the present invention. Sectional diagram showing changes in state in half, No. 4
The figure is a partially cutaway side view showing another embodiment of the present invention.
FIG. 5 is a partially enlarged view, and FIG. 6 is a sectional view showing another embodiment of the on-off valve according to the present invention. 1...Fixed punch, 2...Wrinkle press plate, 4...
Slide, 5... Main ram, 6... Hydraulic pressure chamber, 6a...
...Dome body, 7...Movable plug, 8...Opening/closing valve,
9... Diction mechanism, 14... Sealing material,
73... Ram body, A... Annular pressurizing chamber.

Claims (1)

[Scope of utility model registration request] A fixed punch 1 on the bed side and a wrinkle presser plate 2 supported around this by a dictation mechanism 9.
The slide 4, which is raised and lowered by the main ram 5, is provided with a die 13 that holds the blank between the wrinkle presser plate 2, and the slide 4 has a dome body 6a with its bottom facing upward. A movable plug 7 equipped with an on-off valve 8 that allows the liquid sealed in the dome internal hydraulic pressure chamber 6 to flow out into an annular pressurizing chamber A surrounding the punch shoulder during molding is disposed on the dome body 6a so as to be movable up and down. A sealing material 14 that contacts the blank is attached to the lower surface of 7, and a ram body 73 that penetrates the bottom of the dome body 6a is provided at the rear, and the distance l ₁ between the outer peripheral surface of this ram body 73 and the inner wall of the dome is sealed. A single-acting opposed hydraulic press characterized in that the distance from the material to the outside diameter of the punch is larger than _l2 .