JPH0810469Y2 - Press equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a press device for closing and molding a material by pressing a die from both vertical and horizontal directions.

[Conventional technology]

2. Description of the Related Art As a conventional pressing apparatus, there is one that presses an upper die and a lower die from both upper and lower directions to bring the upper die and the lower die into close contact with each other, and then advances a punch in a horizontal direction to close and form a material in a die.

FIG. 4 shows a conventional pressing device of such a bidirectional pressing type. This press device is provided with a base 20 and a press ram 21 that can be moved up and down, and a number of through holes 22 formed in the base 20 are provided with pressing pins 23 that can be moved up and down. A pin driving device 24 for raising and lowering the pressing pin 23 is provided.

A mold support 25 having a lower mold 26 fixed to the upper surface is placed on the upper part of the base 20, and an upper mold 27 is placed at the lower end of the press ram 21 so as to face the lower mold 26. It is installed.

When the support pins 25 are pushed down by the pressing pins 23 on both sides of the mold support base 25, they swing about a shaft 28 as a fulcrum and the upper mold 27
And a pressing arm 29 that is rotated by being guided by a guide surface provided on the contact surface of the lower die 26.
A punch 31 that moves horizontally with respect to the upper and lower dies is attached to the tip of the punch.

In order to perform press molding in the above press device, the press ram 21 is lowered to press the upper die 27 to the lower die 26 while the die support base 25 is raised and held by the pressing pin 23. As a result, the ram 21 continues to descend while the mold support 25 is held by the driving of the pin drive device 24, so that the pressing arm 29 swings about the shaft 28 as a fulcrum, and the punch 31 moves forward in the horizontal direction. Pressurize from both sides. Therefore, the material is pressed in the mold in a closed state, and the molding is completed.

[Problems to be solved by the device]

By the way, in the above-mentioned closing molding, a pressing force exceeding several tens of tons is required as a molding pressure, and the driving device 24 of the press ram 21 and the pressing pin 23 has a driving capacity sufficient to output the pressing force. Will be required.

However, the conventional pin driving device 24 is formed by using an air cylinder, and in order to obtain a pressing force exceeding several tens of tons using the air cylinder, a large diameter air cylinder is used, and FIG. It is necessary to connect a large number of air cylinders 30 in series to increase the applied pressure as shown in FIG.

However, in such a structure in which a large number of large-diameter air cylinders are connected, the overall size of the device becomes significantly large, so a vast installation space is required. It had the drawback of being expensive.

Further, since the above-mentioned press device is a dedicated machine that normally performs only closure molding because it is difficult to remove the pin drive device 24, a normal press that presses only the upper mold and the lower mold without blocking the material. When it is used for molding, it takes a lot of time to change the setup and there is a problem that the work is limited.

The present invention has been made in view of the above-mentioned drawbacks, and by compacting and simplifying the driving portion of the pressing pin, it can be compactly formed at low cost, and can be easily diverted to a press other than the closing molding. It is an object of the present invention to provide a press device capable of

[Means for solving the problem]

In order to solve the above problems, the present invention provides a piston at the lower end of each pressing pin, and forms a cylinder in which the piston slides in the vertical direction inside the base,
A working fluid for pressurizing the piston is enclosed in each cylinder, and each cylinder is communicated with a manifold inside the base having a volume amount larger than the total volume of the respective cylinders added together, The manifold was connected to a fluid pressure adjusting means for injecting or releasing a working fluid into the manifold.

Further, a high pressure inert gas can be used as the working fluid. As the inert gas, N ₂ , CO, Ar gas or the like can be used.

[Action]

In the above structure, the working fluid enclosed in the cylinder pressurizes the piston to raise the pressing pin and push up and hold the die support.

In the above structure, since the drive part of the pressing pin is housed inside the base, it can be used for press molding other than the closing molding by removing the base.

Further, when the cylinders communicate with each other through the manifold, the pressure inside all the cylinders becomes uniform, so that the upward and downward movements of the pressing pins can be made uniform. In addition, since a manifold with a large volume communicates with each cylinder, the pressure change inside each cylinder during the stroke of piston movement can be reduced, and a constant fluid pressure is always applied to each pressing pin during press operation. Can be operated.

In addition, since the fluid pressure adjusting means can introduce and maintain a fluid pressure of a predetermined pressure inside the manifold, it is possible to exert a driving force necessary for the press through each pressing pin.

〔Example〕

1 to 3 show a base of the pressing apparatus of the embodiment. The structure of the press ram and the die support other than this base is the same as the conventional structure shown in FIG. 4, and the description thereof is omitted here.

As shown in FIG. 1 and FIG. 2, the base 1 is provided with a large number of cylinder holes 2 whose upper portions are opened at concentric circles at equal intervals. The cylinder hole 2 is formed by hollowing out the base 1 into a cylindrical shape in the vertical direction, and the cylinder plug 3 is attached by screwing into the screw portion 2a formed in the upper opening thereof.

As shown in FIG. 3, the cylinder plug 3 is open at the top and bottom, and a pressing pin 4 is fitted inside the cylinder plug 3 so as to be movable up and down. A piston 5 is formed at the lower end of the pressing pin 4, and the piston 5 is slidably fitted to the inner peripheral surface of the cylinder plug 3 via a seal 6. Within the fitting range, the pressing pin 4 Is to be projected and retracted from the upper opening 3a of the cylinder plug 3. In the above case, the space where the inside of the cylinder plug 3 on which the piston 5 slides and the cylinder hole 2 are combined is
A cylinder for pressurizing the piston 5 is configured.

Inside the base 1, a manifold 7 is formed by hollowing out vertical and horizontal cylindrical holes, and all the cylinder holes 2 are communicated by the manifold 7. This manifold 7 has four openings 8 on each side of the base 1.
Are formed, and each is closed by a screw plug 9, and the inside of the manifold 7 and the inside of each cylinder hole 2 are filled with high-pressure N ₂ gas. Above manifold 7
As shown in FIGS. 2 and 3, has an inner diameter substantially the same as that of the cylinder hole 2, and its length is as shown in FIG. 1 along the arrangement of the cylinder holes 2 of the base 7. It extends in the interior in two rows in the vertical and horizontal directions, and has a larger volume than the total volume of the cylinders that press the pressing pin 4.

A control box 11 provided on the side surface of the base 1 as a fluid adjusting means is connected to the manifold 7 through a communication hole 10. This control box 11
Detects the gas pressure inside the manifold 7 through the communication hole 10 and performs setting, injection, release, pressure display, etc. of the gas pressure. The gas pressure inside the manifold 7 is adjusted and maintained at a predetermined value. .

In the press apparatus of the embodiment having the above-described structure, N ₂ gas is introduced into the manifold 7 from the control box 11 during press molding to set the gas pressure inside the cylinder hole 2 to a required value. In this case, push pin 4
The pressing force applied to the press ram 21 is set within the range of several tons to 10 tons against the pressing force of the press ram 21 of several tens of tons.

After the gas is introduced into the manifold 7, the press ram descends, and further descends even after the upper and lower molds are in close contact,
Since the gas pressure rises uniformly inside the manifold 7,
The pressure of each cylinder hole 2 communicating with the manifold 7 rises uniformly, and each piston 5 is pressurized with the same pressure. Therefore, all the pressing pins 4 are lifted up uniformly and hold the die support 25 in a horizontal state.

By connecting the cylinder holes 2 to each other through the manifold 7 as in the above embodiment, the gas pressure in each cylinder hole 2 can be uniformly changed, and the die support table 25 can be moved vertically. is there. In addition, since the manifold 7 increases the volume of gas that can be expanded / contracted to pressurize the pistons 5, as compared with the case where only each cylinder hole 2 is independent, the pressure change during the moving stroke of the pistons 5 is increased. There is an effect that can be reduced.

On the other hand, when press molding other than the closing molding is performed, the mold support 25 is removed from the base 1 and then the base 1 is removed. As a result, the pressing arm and the driving portion of the pressing pin 4 can be completely removed, so that the pressing device can be used for other different molding.

The working fluid for pressurizing the piston 5 may be another inert gas such as CO or Ar, in addition to the N ₂ gas. Since such an inert gas exerts an extremely large pressing force with a small volume change, it is most suitable for a structure which produces a pressing force exceeding several tens of tons with a small capacity cylinder as in the present invention.

Further, as the working fluid, a liquid may be used in addition to the above gas. In this case, the liquid undergoes less expansion / contraction volume change than gas, so an accumulator that stores the fluid is connected to the fluid inlet to take a structure that can cope with the volume change that occurs when the pressing pin moves up and down. Is good.

[Effect of device]

As described above, according to the present invention, the cylinder for pressing the pressing pin is formed inside the base, and the driving part of the pin is housed inside the base. Therefore, compared with the conventional structure in which many air cylinders are connected, Therefore, the shape of the device can be made extremely compact and the number of parts is reduced,
There is an advantage that it can be formed at low cost.

Further, since the entire drive portion of the pressing pin can be removed by removing the base, there is an advantage that it can be easily diverted to press molding other than the closure molding.

Further, since a large volume manifold connected to the fluid adjusting means communicates with each cylinder, the fluid pressure necessary for press working can always be applied to each press pin, and stable press performance for a long period of time can be achieved. Can be held.

[Brief description of drawings]

FIG. 1 is a partial vertical plan view showing a base of the embodiment, FIG. 2 is a side sectional view taken along the line I-I of FIG. 1, and FIG. 3 is a side sectional view showing an essential part of the same. FIG. 4 is a side sectional view showing a conventional structure. 1 ... Base, 2 ... Cylinder hole, 3 ... Cylinder plug, 4
...... Pressing pin, 5 ...... Piston, 7 ...... Manifold,
8 ... Opening, 11 ... Control box, 21 ... Press ram, 25 ... Mold support, 26 ... Lower mold, 27 ... Upper mold.

Claims (2)

[Scope of utility model registration request] 1. A base is provided with a large number of pressing pins projecting upward and downward from the upper surface thereof, and a die support provided between the base and a press ram which can be raised and lowered is pushed up and held by the pressing pins. At the same time, in a press device for closing and molding the upper die attached to the press ram to the lower die attached to the die support base, a piston is provided at the lower end of each of the pressing pins, and inside the base. The piston forms a cylinder that slides in the vertical direction, and the working fluid that pressurizes the piston is enclosed in each cylinder, and the cylinders are more than the sum of the total volumes of the cylinders. It is characterized in that it communicates with a manifold inside a base having a large volume, and a means for adjusting a fluid pressure for injecting or releasing a working fluid into the inside is connected to the manifold. Press apparatus. 2. The press apparatus according to claim 1, wherein the working fluid is a high-pressure inert gas.