JP4104390B2 - High surface pressure processing press such as forging, and press forming method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a high surface pressure processing press such as forging in the press field such as forging and a press molding method thereof, and more particularly to a high surface pressure processing press such as forging that can be pressed at a high surface pressure by connecting a plurality of pistons. The present invention relates to a molding method.
[0002]
[Prior art]
Hydraulic presses that require high surface pressure, such as hot forging presses, cold forging presses, and die-pressing presses, are exclusively used by increasing the number of pressure cylinders or increasing the cylinder diameter. However, the equipment has been increased in size, the capacity of the hydraulic power source has increased, and it has become expensive and requires a large space.
[0003]
Therefore, the pressurizing cylinder of the hydraulic press is kept small, and a pressure intensifier is connected to generate high pressure oil to increase the surface pressure.
[0004]
[Problems to be solved by the invention]
However, even if the diameter of the ram (piston) can be reduced by increasing the pressure in this way, the thickness of the cylinder increases, and the expected effect cannot be obtained.
[0005]
In recent years, there has been a demand for a high surface pressure processing press that requires a large pressing force for a small table size, and it has been a challenge to develop an economical hydraulic press that can obtain a high surface pressure.
[0006]
[Means for Solving the Problems]
The present invention has been made in view of the above points, and in order to solve the above-described problems, a pressure cylinder in the form of a thick cylinder of the high surface pressure processing press is formed as a crown portion. The pressure cylinder is divided into a ring shape and oil-tightly stacked, and the tie rod is passed through the thick peripheral part and connected to the lower column. As described above, the crown part is high even if the table size is small. The pressurizing cylinder that is the surface pressure can be pressed, and the inside of the pressurizing cylinder that is the crown part is divided up and down by a partition wall, and the upper piston is arranged in a ram shape on the upper cylinder that is partitioned by the partition wall up and down and the lower cylinder The lower piston is arranged in the form of a ram, the required high pressure oil is supplied to the upper piston side and the lower piston side, and the upper and lower pistons are press molded at high surface pressure. To provide a high surface pressure working press and the press molding method such as forging to symptoms.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The high surface pressure processing press such as forging according to the present invention and the press molding method thereof are formed by forming a pressure cylinder in the shape of a thick cylinder of the high surface pressure processing press as a crown portion , and the pressure cylinder is in a ring- cut state. Divided into oil-tight layers and penetrated through the tie rods to the thick peripheral part and connected to the lower column, and as described above, even as the table size is small, high surface pressure pressing is possible. The pressure cylinder used as the crown part is divided into upper and lower parts by a partition wall, and the upper piston is arranged in a ram shape in the upper cylinder divided up and down by the partition wall, and the lower piston is arranged in a ram form in the lower cylinder. It is characterized in that it is formed so that the required high pressure oil is supplied to the upper piston side and the lower piston side and press molding is performed at a high surface pressure by the upper and lower pistons. It is intended.
[0008]
As shown in FIGS. 1 and 2, the high surface pressure processing press 1 is provided with a pressurizing cylinder 3 in the crown portion 2 and controls the slide 4 so as to be movable up and down toward the lower bed 5 side. Even if it is small, high surface pressure can be pressed.
[0009]
As shown in FIGS. 1 and 2, the pressurizing cylinder 3 is divided into a cylinder 6 with a partition wall 7 in the vertical direction, and an upper piston 9 is disposed on an upper cylinder 8 on the upper side, and a lower cylinder on the lower side. A lower piston 11 is disposed at 10. Then, the upper piston 9 and the lower piston 11 are oil-tightly connected by the upper piston rod 12 through the partition wall 7, and the lower piston 10 is attached to the lower piston 11 by attaching the ram-shaped lower piston rod 13. And a die (not shown) is attached via the slide 4 and press-molded with a predetermined stroke and high surface pressure output via the upper and lower pistons.
[0010]
The upper piston rod 12 and the lower piston rod 13 can be easily assembled by an appropriate means. As shown in the figure, the upper piston rod 12 and the lower piston rod 13 are formed into a ram shape, and the lower piston rod 13 is made as thick as possible. The diameter is preferable because the reaction force of the piston can be suppressed and the applied pressure can be used effectively.
[0011]
A hydraulic pressure supply port 15 is provided on the top 14 side of the pressurizing cylinder 3 so as to be able to supply pressure oil such as high pressure, and external air is provided in the upper cylinder 8 between the upper piston 9 and the partition wall 7. An air circulation port 16 is provided so as to be freely circulated, and a hydraulic pressure supply port 17 is provided on the partition wall 7 so as to be able to supply pressure oil such as high pressure to supply the lower cylinder 10 to pressurize the lower piston 11. . Reference numeral 18 denotes a pull-back hydraulic pressure supply port for the upper piston 9 and the lower piston 11 that are opened on the bottom 19 side of the pressure cylinder 3.
[0012]
Further, the above-described pressure cylinder 3 is formed into a thick cylinder shape as shown in FIGS. 1 and 2, and the cylinder 6 is appropriately divided into a ring shape and oil-tightly laminated so as to have a thick peripheral portion. Further, the cylinder 6 is formed as a crown portion 2 as small as possible so as to generate a high output.
[0013]
The pressurizing cylinder 3 of the high surface pressure processing press 1 includes a high pressure oil supply circuit 22 for a high pressure pump, a medium pressure oil supply circuit 23 for a medium pressure pump, and a low pressure oil supply circuit 24 for a low pressure pump as shown in FIG. The pull-back circuit 25 and the like can be appropriately switched and supplied so that press forming can be performed with an appropriate pressure such as high output, medium output, and low output.
[0014]
In the above, the pressurizing cylinder 3 is a two-stage piston consisting of an upper piston 9 and a lower piston 11, but it can be a multistage such as a three-stage or four-stage piston. And preferred.
[0015]
【Example】
FIG. 1 and subsequent figures show an embodiment of the present invention. The high surface pressure processing press 1 has a 3000 tf output. As shown in FIGS. 1 and 2, the outer diameter of the crown portion 2 formed by the pressure cylinder 6 is appropriately divided into 2000 mm and is oil-tight. The tie rod 20 is connected to the lower column 21, and the inside of the cylinder 6 is vertically divided by the partition wall 7 to form the cylinder 6 of the pressure cylinder 3. The upper piston 9 has an outer diameter of 880 mm, the upper piston rod 12 has an outer diameter of 500 mm, and the lower The outer diameter of the piston 11 was 880 mm, the outer diameter of the lower piston rod 13 was 850 mm, and the stroke was 300 mm.
[0016]
Then, as shown in FIG. 3, high pressure oil supply circuit 22 using a high pressure pump of 30 MPa, medium pressure oil supply circuit 23 of a medium pressure pump of 7 MPa, low pressure oil supply circuit of a low pressure pump at the hydraulic supply ports 15 and 17 of the pressurizing cylinder 3. 24 is connected so that required hydraulic oil can be supplied, and an accumulator 26 is connected to the pullback hydraulic pressure supply port 18 to form a pullback circuit 25.
[0017]
Various methods are conceivable for its use. For example, as shown in FIG. 4, in a low load state with high speed descent, low pressure oil is supplied from the low pressure oil supply circuit 24 to the hydraulic supply port 15 of the upper cylinder 8 of the pressurizing cylinder 3. The slide 4 is lowered at a high speed simultaneously to the hydraulic pressure supply port 17 of the side cylinder 10, and then the intermediate pressure oil is supplied from the intermediate pressure oil supply circuit 23 to the hydraulic pressure supply port 15 on the upper cylinder 8 side as shown in FIG. If the sequence valve is activated by gradually increasing the applied pressure, it is also supplied to the hydraulic pressure supply port 17 of the lower cylinder 10 and is clamped.
[0018]
Then, as shown in FIG. 6, high pressure oil is sequentially supplied from the high pressure oil supply circuit 22 to the upper cylinder 8 during molding, and is also supplied to the lower cylinder 10 via the sequence valve 27. Press the upper and lower pistons and press-mold. When press molding is performed, pressure oil is supplied to the lower cylinder 10 via a pull back hydraulic circuit 25 connected to the pull back hydraulic supply port 18 by releasing these pressures, and the slide 4 is raised at a high speed.
[0019]
Thus, since high pressure hydraulic oil can be applied to the upper and lower pistons of the upper and lower pistons for press working, high surface pressure can be pressed even if the table size is small. In addition, as described above, since the cylinder of the pressure cylinder is the crown portion, the apparatus can be miniaturized and the price can be reduced.
[0020]
In addition, it is possible to perform high-speed and high-pressure pressing with a small amount of oil as described above, without the need to place a plurality of pressure cylinders in parallel at the crown. Also, if necessary, a low-pressure oil supply circuit and a medium-pressure oil supply circuit Can be used in a variety of ways with a capacity of 370 tf using the above as described above, or by supplying a high pressure oil supply circuit only to the upper piston side.
[0021]
In addition, about the above-mentioned pressurization cylinder structure and a hydraulic circuit, a suitable deformation | transformation aspect can be implemented based on the above-mentioned meaning of this invention.
[0022]
【The invention's effect】
Above in the present invention as described above, a high surface pressure working press forging or the like for press-molding a molded article with a high surface pressure, the pressure cylinders and the high surface pressure working press of the wall thickness of the cylindrical The pressure cylinder is divided into a ring shape and oil-tightly laminated, and the tie rod is passed through the thick peripheral portion and connected to the lower column, as described above. Even if the table size is small, high surface pressure can be pressed, and the pressure cylinder used as the crown part is divided up and down by a partition wall, and the upper piston is rammed into the upper cylinder partitioned by the partition wall up and down. Since the lower piston is arranged in a ram shape on the lower cylinder, the crown portion is formed of a pressure cylinder, and a plurality of pressure cylinders are not juxtaposed on the crown portion. Small dimensions can press forming such as forging also high surface pressure output. The press cylinders of the press, which are partitioned by the partition walls at the top and bottom, can be pressurized via the upper and lower multi-stage pistons by using the upper and lower multi-stage pistons. Can be done.
[0023]
In addition, by forming a crown portion with the cylinder of the pressure cylinder and forming a cylinder space portion between the upper piston of the cylinder of the crown portion and the partition wall so as to be able to communicate with the atmosphere, the hydraulic oil below the piston It is possible to perform press molding with good pressurization efficiency by reducing discharge resistance and suppressing reaction force as much as possible.
[0024]
And, by connecting the high pressure oil supply circuit and the hydraulic circuit of the medium pressure oil supply circuit to the upper piston side and lower piston side of the pressure cylinder, it can be used as high pressure press and medium pressure press as mentioned above Can be used for
[Brief description of the drawings]
FIG. 1 is a cross-sectional front view partially omitted of an embodiment of the present invention;
FIG. 2 is a transverse cross-sectional view of the same crown part;
FIG. 3 is an explanatory diagram of a hydraulic circuit diagram partially omitted from the above,
FIG. 4 is an explanatory diagram of an example of use of the above,
FIG. 5 is an explanatory diagram of an example of use of the above,
FIG. 6 is an explanatory diagram of an example of use of the above.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... High surface pressure processing press 2 ... Crown part 3 ... Pressure cylinder 4 ... Slide 6 ... Cylinder 7 ... Partition wall 8 ... Upper cylinder 9 ... Upper piston 10 ... Lower cylinder 11 ... Lower piston 12 ... Upper piston rod 13 ... Lower piston rod

Claims (4)

A high surface pressure processing press such as forging that press-molds a molded product at a high surface pressure,
A high-pressure cylinder press cylinder is formed as a crown , and the pressure cylinder is divided into a ring-shaped state and oil-tightly laminated. Through the tie rod and connected to the lower column, as described above, high surface pressure pressing is possible even if the table size is small as the crown part,
The inside of the pressure cylinder as the crown part is divided up and down by a partition wall, and the upper piston is arranged in a ram shape in the upper cylinder partitioned by the partition wall up and down, and the lower piston is made a ram shape in the lower cylinder. High surface pressure processing such as forging, characterized in that it is arranged to supply the required high pressure oil to the upper piston side and lower piston side and press-mold with high pressure by the upper and lower pistons press.   The high surface pressure of forging or the like according to claim 1, wherein a crown portion is formed by a cylinder of a pressure cylinder, and a cylinder space between the upper piston of the cylinder of the crown portion and the partition wall is formed so as to be freely circulated to the atmosphere. Processing press. It is a press molding method for high surface pressure processing such as forging that press-molds a molded product with high surface pressure,
A high-pressure cylinder press cylinder is formed as a crown , and the pressure cylinder is divided into a ring-shaped state and oil-tightly laminated. Through the tie rod and connected to the lower column, as described above, high surface pressure pressing is possible even if the table size is small as the crown part,
The inside of the pressure cylinder as the crown part is divided up and down by a partition wall, and the upper piston is arranged in a ram shape on the upper cylinder partitioned by the partition wall up and down, and the lower piston is made a ram shape in the lower cylinder. A press forming method for high surface pressure processing such as forging, characterized in that the high pressure oil supply circuit is connected to the upper piston side and the lower piston side and press forming is performed at a high surface pressure.   The high surface pressure processing such as forging according to claim 3, wherein a high pressure oil supply circuit and a hydraulic circuit of an intermediate pressure oil supply circuit are connected to the upper piston side and the lower piston side, and press forming is performed at high surface pressure and medium surface pressure. Press molding method.

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