JP2536814B2 - Pneumatic press equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic press device that operates by air pressure.

[0002]

2. Description of the Related Art FIG. 8 shows a conventional pneumatic press device A.
In the pneumatic press device A, a plurality of straight side type frames C are erected on a plate-shaped bolster B, a plate D is supported in parallel with the bolster B, and a pneumatic cylinder E is placed on the plate D. There is. In the pneumatic cylinder E, a piston G that slides in the axial direction is arranged in a cylindrical cylinder tube F, and a cap side space H and a rod side space I are formed above and below the piston G. Further, a rod J is provided on the lower surface of the piston G, and a packing K is provided on the peripheral surface. In the method of using the pneumatic press device A, the lower mold L of the mold divided into the upper and lower parts is attached to the bolster B, and the upper mold M is attached to the tip of the rod J. Then, air pressure is applied to the cap side space H to cause the piston G to slide downward, the upper die M is pressed against the lower die L via the rod J, and the workpiece is pressed. After the pressing, the air pressure in the cap side space H is cut off, and air pressure is applied to the rod side space I to move the upper mold M upward. The outer diameter of the piston G of the pneumatic press device A is 200 mm, and the pneumatic pressure supplied to the cap side space H is 7 kg.
A pressing force of about 2t can be obtained with f / cm ² .

[0003]

[Problems to be Solved by the Invention] The conventional pneumatic press apparatus A has the following problems. <A> In order to obtain a high pressing force without changing the air pressure, it is necessary to increase the piston outer diameter. As a result, the pneumatic press device A becomes large.

<B> When an unbalanced load is applied to the mold, a strong bending force is applied to the rod J, which may deform and damage the rod J.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. An object of the present invention is to provide a pneumatic press device which is small in size, can obtain a high pressing force, and can cope with an unbalanced load. It is to be.

[0006]

A solution for the] Namely, the present invention includes: a cylinder tube exhibiting a cylindrical, in part this cylinder tube
A piston that is slidable within the scope, opened in the vicinity of one end of the cylinder tube circumference, a workpiece
The pneumatic press device is configured by an insertable opening, applies air pressure to the inside of the cylinder tube, moves the piston in the direction of the opening, and presses in the cylinder tube.

[0007]

[Embodiment 1] Embodiment 1 of the present invention with reference to the drawings.
Will be described.

<B> Overall Configuration (FIG. 1) FIG. 1 is a perspective view of the pneumatic press device 10. The pneumatic press device 10 is configured by disposing pistons 21 and 31 in two cylinder tubes 20 and 30, respectively, and connecting the pistons 21 and 31 with a rod 40. Each part will be described in detail below.

<B> Pressurizing Cylinder Tube (FIGS. 1 and 2) The pressurizing cylinder tube 20 is a cylinder whose lower end is closed by a bolster 22 and whose upper end is closed by a plate 23. In order to obtain a large pressing force, it is preferable that the pressurizing cylinder tube 20 has a larger diameter than the returning cylinder tube 30 described later. As shown in FIG. 1, an opening 26 is formed in the lower peripheral surface of the pressurizing cylinder tube 20. A plurality of openings 26 may be provided if necessary. As shown in FIG. 2, the inner peripheral surface of the pressurizing cylinder tube 20 has a smaller diameter in the lower portion than in the upper portion, and a step 24 is formed at the boundary. A port 25 penetrating the inner and outer peripheral surfaces is formed in the upper part of the peripheral surface of the pressurizing cylinder tube 20. Bolster 22
Is a member for mounting a lower mold 221 of a mold which is divided into upper and lower parts. The upper surface of the bolster 22 may be processed to form a lower die, and the bolster 22 and the lower die 221 may be integrally formed. The plate 23 is a member that functions as a partition that separates the pressurizing cylinder tube 20 and the returning cylinder tube 30, and has a through hole 231 for the rod 40. A packing 232 is arranged on the inner peripheral surface of the through hole 231. The pressurizing cylinder tube 20 houses a pressurizing piston 21 therein.

<C> Pressurizing Piston (FIGS. 1 and 2) The pressurizing piston 21 has an outer peripheral surface just fitted to the inner peripheral surface of the pressurizing cylinder tube 20. It is formed so that it can slide up and down. A step 211 is formed on the outer peripheral surface of the pressurizing piston 21, and the step 211 contacts the step 24 to function as a stopper. A packing 212 is attached to the outer peripheral surface of the pressurizing piston 21. The lower end of the rod 40 is fixed to the upper end surface of the pressurizing piston 21. The fixed position of the rod 40 is slightly deviated from the center of the pressurizing piston 21 so that the pressurizing piston 21 does not rotate. Therefore, even if the pressurizing piston 21 slides up and down, the lower end surface of the pressurizing piston 21 and the upper end surface of the lower die 221 are always in contact with each other at the same position and fitted. The lower end surface of the pressurizing piston 21 is processed in advance as an upper die of a die which is divided into upper and lower halves. That is, the pressurizing piston 21 and the upper die are integrally formed. This upper die is for pressurizing piston 2
It may be formed separately from 1 and detachably attached to the lower end of the pressurizing piston 21.

<D> Returning Cylinder Tube (FIG. 2) The returning cylinder tube 30 has the lower end at the plate 2
It is a cylinder closed at 3. As shown in FIG. 2, the return cylinder tube 30 is placed on the plate 23. In the lower part of the circumference of the return cylinder tube 30,
A port 32 is opened to penetrate the inner and outer peripheral surfaces. Further, a ventilation hole 33 penetrating the inner and outer peripheral surfaces is formed in the upper part of the peripheral surface of the return cylinder tube 30. In FIG. 2, the upper end of the returning cylinder tube 30 is closed, but the upper end may be opened and the ventilation hole 33 may be omitted. The return cylinder tube 30 houses the return piston 31 therein.

<E> Returning Piston (FIG. 2) The returning piston 31 has an outer peripheral surface which fits exactly with the inner peripheral surface of the returning cylinder tube 30, and the inside of the returning cylinder tube 30 is vertically moved. It is formed so that it can slide. A packing 312 is arranged on the outer peripheral surface of the returning piston 31 along the circumferential direction. Return piston 31
The end of the rod 40 is fixed to the lower end surface of the rod 40, and the return piston 31 includes the pressurizing piston 21 and the rod 40.
Are connected by.

[0013]

Next, a method of using the pneumatic press device 10 will be described.

<A> Set of pneumatic press device The port 25 and the port 32 are connected to an existing compressed air pipe or compressor which serves as an air pressure source. A connection selector is provided between the air pressure source and the ports 25 and 32, and the pneumatic press device 10 is set so that the ports 25 and 32 can be switched between a pressurized state and an open state. deep.

<B> Pressing Step (FIGS. 1 to 3) The port 25 is opened and the port 32 is pressurized to move the pressurizing piston 21 and the returning piston 31 upward. The workpiece 50 is inserted into the pressurizing cylinder tube 20 through the opening 26 and set on the lower die 221.

Then, the states of the port 25 and the port 32 are switched to lower the pressurizing piston 21 and the returning piston 31 as shown in FIG. At this time, since the rod 40 is fixed to the upper end surface of the pressurizing piston 21 by removing the center of the pressurizing piston 21, the pressurizing piston 21 does not rotate about the vertical axis. Therefore, the pressurizing piston 21 having the upper mold formed on the lower end surface can be securely fitted to the lower mold 221. Further, since the pressurizing piston 21 has a larger diameter than the return piston 31, a high pressing force can be obtained. For example, if the outer diameter of the pressurizing piston 21 is 400 mm and the supplied air pressure is 7 kgf / cm ² , a pressing force of about 8 t can be obtained. At the time of pressing, the pressurizing piston 21, that is, the upper die is directly pressed without the rod 40, and the outer periphery of the pressurizing piston 21 is guided by the inner peripheral surface of the pressurizing cylinder tube 20. Therefore, even if an eccentric load is applied to the pressurizing piston 21, a biased compressive force is not applied to the rod 40, and the load position does not deviate from the pressurizing point. Therefore, there is no concern that the rod 40 will be deformed during pressing.

When the pressurizing piston 21 is lowered,
As shown in FIG. 3, the step 221 of the pressurizing piston 21 and the step 24 of the pressurizing cylinder tube 20 come into contact with each other to stop the pressurizing piston 21 and press the workpiece 50.

<C> Piston Return Step The port 32 is opened and the port 25 is pressurized to move the pressurizing piston 21 and the returning piston 31 upward. Then, the material 50 that has been pressed is taken out from the opening 26, and the next material 50 to be processed is moved to the lower die 22.
Set to 1 and press again.

[0019]

[Embodiment 2] FIG. 4 is a perspective view of a pneumatic press device 60 of this embodiment. In the pneumatic press device 60, the upper and lower open ends of the cylinder tube 61 are closed by a cylinder cap 62 and a bolster 64, and a piston 63 is placed inside the cylinder tube 61.
Are arranged. Each part will be described in detail below. As shown in FIG. 4, the cylinder tube 61 has an opening 612. As shown in the cross-sectional view of FIG. 5, a piston guide 611 for restricting the downward movement of the piston 63 is attached to the inner peripheral surface of the cylinder tube 61. Example 1 without the piston guide 611
As described above, a step may be provided on the inner peripheral surface of the cylinder tube 61. On the cylinder cap 62, a pole 621 is vertically provided so as to project from one surface. The pawl 621 prevents the piston 63 from rotating. Although a plurality of poles 621 are installed in FIGS. 4 and 5, if they are installed avoiding the center of the piston 63, they may be formed as a single pole. The piston 63 includes the cylinder tube 61 and the pole 6 from the cylinder cap 62 to the position where it abuts on the piston guide.
It is arranged slidably along 21. Further, the bolster 64 is provided with an outlet 641 for the workpiece 50. Inner peripheral surface of cylinder tube 61, cylinder cap 6
A processing pressure chamber 65 is formed in a space surrounded by the second pole 621 installation surface and the piston 63 upper surface. A piston rising pressurizing chamber 66 is formed in a space surrounded by the inner peripheral surface of the cylinder tube 61, the upper surface of the piston guide 611, and the lower surface of the edge of the piston 63. Although not shown, the working pressure chamber 65 and the piston raising pressure chamber 66 are each provided with an air pressure port.

Next, a method of using the pneumatic press device 60 will be described. As shown in FIG. 5, the upper die 67 for processing the workpiece 50 is fixed to the lower surface of the piston 63, and the lower die 68 is fixed to the upper surface of the bolster 64 in advance. The workpiece 50 is mounted on the lower mold 78 through the opening 612. Pneumatic pressure is applied to the processing pressure chamber 65 to lower the piston 63. Then, the upper mold 67
Contacts the workpiece 50. At this time, even if an unbalanced load is applied to the piston 63, the piston 63 will not
Since it is supported by the pole 621 on the inner peripheral surface of No. 1, it slides without tilting. Further, the piston 63 has a plurality of poles 62.
Since it is supported by 1, it does not rotate about the vertical axis. Therefore, the upper die 67 fixed to the lower surface is replaced with the lower die 68.
Can be securely fitted to. The processed material 50 drops into the outlet 641 of the bolster 64 and is collected. After processing, pneumatic pressure is applied to the piston raising pressure chamber 66 to raise the piston 63, discharge the scraps, set the next workpiece 50 on the lower die 68, and perform processing again.

[0021]

Third Embodiment FIG. 6 shows a perspective view of a pneumatic pressing device 70 of this embodiment. The pneumatic press device 70 is configured by closing the opening lower end of the cylinder tube 71 with a bolster 74 and disposing a piston 73 inside the cylinder tube 71.
Each part will be described in detail below. As shown in FIG. 6, the cylinder tube 71 has an opening 712. Figure 7
As shown in the cross-sectional view of FIG. 1, the cylinder tube 71 has a cup shape with one end closed and the other end open.
It is formed by drawing a sheet metal or processing a can. The cylinder tube 71 does not need the cylinder cap as in the first and second embodiments. The piston 73 is slidably arranged along the inner surface of the cylinder tube 71. A plurality of small cylinders 741 for raising the piston are installed in the bolster 74, and the piston 73 can be moved up and down by expanding and contracting the small cylinders 741. Further, the bolster 74 has an outlet 742 for the workpiece 50. In the space surrounded by the inner peripheral surface of the cylinder tube 71 and the upper surface of the piston 73,
A processing pressure chamber 75 is formed. Although not shown,
An air pressure port is provided in the processing pressure chamber 75.

Next, a method of using the pneumatic press device 70 will be described. As shown in FIG. 7, the upper mold 77 for processing the workpiece 50 is fixed to the lower surface of the piston 73, and the lower mold 78 is fixed to the upper surface of the bolster 74 in advance. The workpiece 50 is mounted on the lower mold 78 through the opening 712. Next, pneumatic pressure is applied to the processing pressurizing chamber 75, the small cylinder 741 is contracted, and the piston 73 is lowered. By using the small cylinder 741, the piston 73 can be lowered at a high speed. Then, the upper die 77 comes into contact with the workpiece 50. At this time, even if an unbalanced load is applied to the piston 73, since the piston 73 is supported by the inner peripheral surface of the cylinder tube 71 and the plurality of small cylinders 741, the piston 73 slides without tilting. Further, the piston 73 has a plurality of small cylinders 741.
Since it is supported by, it does not rotate about its vertical axis. Therefore, the upper die 77 fixed to the lower surface can be securely fitted to the lower die 78. The processed material 50 drops into the outlet 742 of the bolster 74 and is collected. After processing, the small cylinder 741 is extended, the piston 73 is raised, the next workpiece 50 is set on the lower die 78, and processing is performed again.

[0023]

Since the present invention is as described above, the following effects can be obtained.

<A> Since the structure is such that the press working is performed in the cylinder tube, the cylinder tube diameter is set to a large value to the extent of the frame width of the conventional pneumatic pressing device, and the cylinder tube is arranged in the cylinder tube. The piston diameter can be increased. Therefore, without increasing the size of the device,
High pressing force can be obtained.

<B> The structure is not a structure in which the material to be processed is pressed through the rod, but a structure in which the material is directly pressed by a piston. Therefore, there is no need to worry about the breakage of the rod due to an unbalanced load as in the conventional case.

<C> Since the pressurizing cylinder tube is extended to function as a frame, no frame is required. Therefore, it can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view of a pneumatic press device according to a first embodiment.

FIG. 2 is an explanatory view of how to use the pneumatic press device.

FIG. 3 is an explanatory diagram of how to use the pneumatic press device.

FIG. 4 is an explanatory diagram of a pneumatic press device according to a second embodiment.

FIG. 5 is an explanatory diagram of a pneumatic press device according to a second embodiment.

FIG. 6 is an explanatory diagram of a pneumatic press device according to a third embodiment.

FIG. 7 is an explanatory diagram of a pneumatic press device according to a third embodiment.

FIG. 8 is an explanatory view of a conventional pneumatic press device.

Claims (1)

(57) [Claims] A cylinder tube exhibiting 1. A tubular, a piston that is slidable within the scope of the part this cylinder tube, opened in the vicinity of one end of the cylinder tube circumference,
Pneumatic press device that is composed of an opening into which a work piece can be inserted , applies air pressure to the inside of the cylinder tube, moves the piston toward the opening, and performs press working inside the cylinder tube.