JP6123810B2 - Double-acting system for forging dies - Google Patents

Description

  The present invention relates to a double-acting system for a forging die.

  The die of the forging device is driven using fluid pressure such as hydraulic pressure and air pressure, or mechanically driven using a crank mechanism having a clutch and a brake, a knuckle mechanism, etc. It is driven by a combination of driving means.

  For example, Patent Document 1 describes a forging device including an upper punch, a lower punch, and left and right side punches as a forging die. In this forging device, a cam is provided in an upper die provided with an upper punch, and when the upper die descends, the side punch is driven by sliding the inclined surface of the cam on the inclined surface of the side punch, The lower punch is moved up and down by a cylinder.

  Patent Document 2 describes that forging is performed by clamping the mold with the hydraulic pressure generated by the lowering of the press ram, then applying the hydraulic pressure to the upper punch and the lower punch, and projecting both the punches. In Patent Document 3, an upper die and a lower die are brought into contact with each other by lowering a slide provided at an upper portion of a press machine, and then hydraulic pressure is generated by further lowering the slide, and the hydraulic chambers of the upper and lower die sets are maintained at high pressure Then, it is described that the closed forging is continued.

Japanese Utility Model Publication No. 63-85346 Japanese Patent Laid-Open No. 11-156471 JP-A-11-197779

  In the punch driving method described in Patent Document 1, the inclined surface of the cam and the inclined surface of the side punch are in contact with each other and slide with a large pressure, so that both inclined surfaces are worn. The stop position changes gradually. Patent Documents 2 and 3 do not disclose a side mold that applies pressure from both sides to a forged material.

  Therefore, the present invention aims to simplify and miniaturize the drive / control system of a forging die having an upper die and a lower die for pressing a forging material and a pair of opposing side dies.

  In order to solve the above-described problems, the present invention drives the upper mold, the lower mold, and one set of side molds using a hydraulic mechanism with one drive source.

The double-acting system of a forging die disclosed here drives an upper mold and a lower mold that pressurize the forging material from above and below, and a pair of opposing side molds that advance and press the forging material from both sides. A system,
Driving means for raising and lowering the upper mold;
A lower die hydraulic cylinder for raising and lowering the lower die;
A pair of side type hydraulic cylinders for advancing and retracting each of the side types;
A first hydraulic mechanism for operating the hydraulic cylinders for the upper Symbol both side type,
And a second hydraulic mechanism for actuating the upper Symbol lower die hydraulic cylinder,
The first hydraulic mechanism receives the driving force of the driving means from the upper mold holder so that the both side molds advance in conjunction with the lowering of the upper mold from the rising end. First hydraulic pressure generating means for generating hydraulic pressure to be transmitted to
The second hydraulic mechanism includes second hydraulic pressure generating means for receiving a driving force of the driving means from a pressing portion provided in the upper mold holder and generating hydraulic pressure transmitted to the lower hydraulic cylinder.
The both side molds move forward in conjunction with the lowering of the upper mold from the rising end, and the lower mold rises in conjunction with the lowering of the upper mold after the upper mold descends a predetermined distance from the rising end. The upper mold so that the pressing part of the upper mold holder and the pressure receiving part of the second hydraulic pressure generating means corresponding to the pressing part come into contact with each other when the upper mold descends a predetermined distance from the rising end. It is characterized by being vertically spaced at the rising end of the.

  According to this double-action system, when the upper die is lowered by the driving means, a part of the driving force of the driving means is converted into hydraulic pressure by the first hydraulic mechanism, and the both-side type hydraulic cylinder is operated. Thereby, both side type | molds advance from both sides of a forge raw material in response to the fall of an upper mold | type, and pressurize a forge raw material. When the upper die is lowered by a predetermined distance, part of the driving force of the driving means is converted into hydraulic pressure by the second hydraulic mechanism, and the lower die hydraulic cylinder is operated. As a result, the lower die rises in conjunction with the lowering of the upper die, and forging pressure is applied to the forging material from above and below by the upper die and the lower die.

  Then, since the driving force of the driving means for lowering the upper mold is driven by converting the hydraulic power into hydraulic pressure, the both side mold and the lower mold need not be provided with dedicated drive sources for both the side mold and the lower mold, The system configuration becomes simple, which is advantageous for downsizing and cost reduction of the system. In particular, since a sliding part such as a cam is not necessary, it is possible to avoid deviations in the operation timing and stop position of both side types and the lower type.

Further, according to the above double-acting system, the first and second hydraulic mechanisms are each provided with hydraulic pressure generating means, and in the second hydraulic mechanism, both side molds move forward in conjunction with the lowering from the rising end of the upper mold. Then, the pressing part of the upper mold holder and the pressure receiving part of the second hydraulic pressure generating means are vertically separated so that the lower mold rises after the upper mold descends a predetermined distance from the ascending end. Accordingly, when the upper die is lowered by a predetermined distance, the pressure portion of the upper die holder is mechanically brought into contact with the pressure receiving portion of the hydraulic pressure generating means to generate the hydraulic pressure. This is advantageous for preventing slippage. Further, the operation timing of the lower mold can be determined by adjusting the interval between the pressing portion and the pressure receiving portion when the upper mold is positioned at the rising end, and it is easy to obtain the expected operation timing.

In a preferred embodiment, the first hydraulic mechanism includes a hydraulic pressure generating cylinder as the first hydraulic pressure generating means, and a connecting member protruding downward from the upper holder is connected to a piston rod of the hydraulic pressure generating cylinder.

  In a preferred embodiment, the first hydraulic mechanism includes a pressure adjustment valve that adjusts a pressure applied to the forging material by the both side dies to a predetermined value. Accordingly, the forging material can be forged from above and below by the upper die and the lower die while keeping the pressure applied to the forging material from both sides to a predetermined value, and it becomes easy to obtain an undercut forged product.

  According to the present invention, since the driving force of the driving means for lowering the upper mold is converted into hydraulic pressure to drive both the side mold and the lower mold, it is necessary to provide a dedicated drive source for both the side mold and the lower mold. The system configuration is simple, and it is advantageous for downsizing and cost reduction of the system. Especially, it is converted into hydraulic pressure by receiving the driving force of the driving means from the lower mold holder, so the both side type In addition, deviations in the operation timing and the stop position of the lower mold can be avoided.

Further, each of the first and second hydraulic mechanisms is provided with a hydraulic pressure generating means. In the second hydraulic mechanism, both side molds move forward in conjunction with the lowering from the rising end of the upper mold, and the upper mold is moved to the rising end. Since the pressing part of the upper mold holder and the pressure receiving part of the second hydraulic pressure generating means are vertically separated so that the lower mold rises after falling a predetermined distance from the system, the system configuration is simplified and the lower mold This is advantageous for preventing the deviation of the operation timing. That is, the operation timing of the lower die can be determined by adjusting the interval between the pressing portion and the pressure receiving portion when the upper die is located at the rising end, and it becomes easy to obtain the expected operation timing.

The front view made into the partial cross section which shows the state before the forge start of the double-acting system of the forge die which concerns on embodiment of this invention. The front view made into the partial cross section which shows the state in the middle of forging of the double acting system. The front view made into the partial cross section which shows the forge completion state of the double action system.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its application, or its use.

<System configuration>
In the double-acting system for forging die shown in FIG. 1, reference numerals 1 and 2 indicate upper and lower molds that press the forging material M from above and below, and 3 and 4 press the forging material M by advancing from both sides thereof. A pair of opposite side types. The upper die 1 is held by an upper die holder 5 and is moved up and down by the operation of a fluid pressure type driving means (hydraulic cylinder) 6.

  The system converts the driving force of a lower mold hydraulic cylinder 7 for raising and lowering the lower mold 2, a pair of side hydraulic cylinders 8 and 9 for moving both side molds 3 and 4 forward and backward, and a driving means 6 into hydraulic pressure. The first hydraulic mechanism 11 for operating the side type hydraulic cylinders 8 and 9 and the second hydraulic mechanism 12 for operating the lower type hydraulic cylinder 7 by converting the driving force of the driving means 6 into hydraulic pressure. Each of the side molds 3 and 4 is supported on support bases 13 and 14 on the base 10 so as to be movable forward and backward horizontally toward the forging material M.

  The first hydraulic mechanism 11 receives a driving force of the driving means 6 from the upper mold holder 5 to generate a hydraulic pressure, a hydraulic pressure generating cylinder 15, a supply oil passage 16 that transmits the hydraulic pressure to the side type hydraulic cylinders 8 and 9, and a return. And an oil passage 17.

  The hydraulic pressure generating cylinder 15 is a double acting cylinder supported on the support base 13 with the cylinder axis vertical. A connecting member 19 protruding downward from the upper holder 5 is connected to the piston rod 18 of the hydraulic pressure generating cylinder 15.

  Connected to the supply oil passage 16 is a pressure adjustment valve 20 that adjusts the pressure applied to the forging material M by the side dies 3 and 4 to a predetermined value. An accumulator 21 is connected to the return oil passage 17.

  The second hydraulic mechanism 12 receives a driving force of the driving means 6 from the upper mold holder 5 and generates a hydraulic pressure, and a supply oil path 26 and a return oil path that transmit the hydraulic pressure to the lower mold hydraulic cylinder 7. 27.

  The hydraulic pressure generating cylinder 25 is a single-acting cylinder supported by the support base 14 with the cylinder axis vertical. A pressure receiving plate (pressure receiving portion) 29 is fixed to the piston rod 28 of the oil pressure generating cylinder 25. Corresponding to the pressure receiving plate 29, a pressing member (pressing portion) 30 protrudes downward from the upper mold holder 5. The pressure receiving plate 29 and the pressing member 30 are vertically moved so that the pressing member 30 comes into contact with the pressure receiving plate 29 when the upper die 1 is lowered from the rising end by a predetermined distance (until the upper die 1 comes into contact with the forging material M). Separated.

  When the upper die holder 5 is raised after forging, hydraulic oil for returning the pressure receiving plate 29 to the original position is supplied from the tank 32 to the oil pressure generating cylinder 25 in the supply oil passage 26 (the return of the pressure receiving plate 29 is returned). (Supported) pump 33 is connected by supply oil passage 34. The supply oil passage 26 is provided with a normally closed electromagnetic directional control valve 35 that prevents hydraulic oil from being supplied to the lower mold hydraulic cylinder 7 when the pump 33 is operated. A check valve 36 and a safety valve 37 are provided in the replenishing oil passage 34, and an accumulator 38 is further connected thereto.

  The hydraulic pressure generating cylinder 25 of the second hydraulic mechanism 12 has a larger diameter than the hydraulic pressure generating cylinder 15 of the first hydraulic mechanism 11. Therefore, the lower die 2 applies a forging pressure larger than that of the side dies 3 and 4 to the forging material M. Connected to the supply oil passage 26 of the second hydraulic mechanism 12 is a pressure adjustment valve 39 that adjusts the pressure applied to the forging material M by the lower mold 2 to a predetermined value larger than the pressure applied by the side molds 3 and 4.

<System operation>
At the time of forging, the direction control valve 35 is set to the open position (see FIG. 2). When the upper die holder 5 is lowered by the operation of the driving means 6, the piston rod 18 of the hydraulic pressure generating cylinder 15 of the first hydraulic mechanism 11 is pushed by the upper die holder 5 via the connecting member 19 and lowered. As a result, forward hydraulic pressure is generated in the hydraulic pressure generating cylinder 15, and the hydraulic pressure is transmitted to the side-type hydraulic cylinders 8 and 9 via the supply oil passage 16, so that the side molds 3 and 4 move forward. As a result, as shown in FIG. 2, the upper die 1 comes into contact with the upper surface of the forging material M, and both side dies 3 and 4 come into contact with both side surfaces of the forging material M. The pressing member 30 contacts the pressure receiving plate 29 of the second hydraulic mechanism 12.

  When the upper mold holder 5 is further lowered, the side molds 3 and 4 are in a state of pressurizing the forging material M from both sides with the hydraulic pressure adjusted by the pressure regulating valve 20 of the first hydraulic mechanism 11. On the other hand, in the second hydraulic mechanism 12, the piston rod 28 of the hydraulic pressure generation cylinder 25 is pushed down by the pressing member 30 via the pressure receiving plate 29. As a result, a hydraulic pressure for raising is generated in the hydraulic pressure generating cylinder 25, and the hydraulic pressure is transmitted to the lower die hydraulic cylinder 7 through the supply oil passage 26, and the lower die 2 is raised.

  As a result, the forging material M is pressed from above and below by the upper mold 1 and the lower mold 2 and formed into a predetermined forged product P as shown in FIG. In this case, the forging material M is pressurized from above and below with the pressure applied from both sides kept at a predetermined value, so that an undercut forged product P shown in FIG. 3 is obtained.

  When the upper die holder 5 is raised after forging, the piston rod 18 of the hydraulic pressure generating cylinder 15 of the first hydraulic mechanism 11 is pulled up by the connecting member 19. As a result, reverse hydraulic pressure is generated in the hydraulic pressure generating cylinder 15, and the hydraulic pressure is transmitted to the side-type hydraulic cylinders 8 and 9 via the return oil passage 17, so that the side molds 3 and 4 are retracted.

  In the second hydraulic mechanism 12, when the upper mold holder 5 is raised, the raising hydraulic pressure by the hydraulic pressure generating cylinder 25 is lowered, and the lower mold 2 is lowered by its own weight. On the other hand, since the pressure receiving plate 29 and the pressing member 30 are not connected, the pump 33 is operated by switching the direction control valve 35 to the closed position (see FIG. 1) in order to quickly return the pressure receiving plate 29 to the original position. As a result, hydraulic oil is supplied from the tank 32 to the hydraulic pressure generating cylinder 25, and the pressure receiving plate 29 returns to the original position.

  As described above, in the first hydraulic mechanism 11, since the piston rod 18 of the hydraulic pressure generating cylinder 15 and the connecting member 19 on the upper mold holder 5 side are coupled, the side mold is interlocked with the lowering and raising of the upper mold 1. 8, 9 will move forward and backward. On the other hand, in the second hydraulic mechanism 12, since the pressing member 30 and the pressure receiving plate 29 are not coupled, even if the upper die 1 starts to descend from the ascending end, the lower die 2 does not rise, and the upper die 1 becomes the forging material M. The pressing member 30 comes into contact with the pressure receiving plate 29 when it is lowered until it comes into contact, and the lower mold 2 rises in conjunction with the lowering of the upper mold 1. The operation timing of the lower mold 2 can be determined by adjusting the distance between the pressing member 30 and the pressure receiving plate 29 when the upper mold 1 is located at the rising end, and it becomes easy to obtain the desired operation timing. .

  Further, since the lower mold 2 and the side molds 3 and 4 are driven by converting the driving force of the driving means 6 for lowering the upper mold 1 into hydraulic pressure, the lower mold 2 and the side molds 3 and 4 have a dedicated drive source. The system configuration is simplified, which is advantageous for downsizing and cost reduction of the system. In particular, since a sliding part such as a cam is not required, the operation timing and stop position of the lower mold 2 and the side molds 3 and 4 can be avoided.

  The driving means 6 for raising and lowering the upper mold 1 is not limited to the hydraulic cylinder 6 and may be a pneumatic cylinder, or a mechanical press mechanism (a crank mechanism having a clutch and a brake, a knuckle press mechanism, a cam press). It is also possible to employ a mechanism or the like.

  Moreover, although the said embodiment is a case provided with one set of side type | molds 3 and 4, in the case which provides another set of side type | molds which oppose the direction orthogonal to the direction which both these side types 3 and 4 oppose. The other set of side molds can also be advanced and retracted by the driving force of the driving means 6 of the upper mold 1 by providing the first hydraulic mechanism 11 described above.

1 Upper mold 2 Lower mold 3 and 4 Side mold 5 Upper mold holder 6 Hydraulic drive cylinder (drive means)
7 Lower Hydraulic Cylinders 8 and 9 Side Die Hydraulic Cylinder 11 First Hydraulic Mechanism 12 Second Hydraulic Mechanism 15 Hydraulic Pressure Generation Cylinder ( First Hydraulic Pressure Generation Means)
20 Pressure adjusting valve 25 Hydraulic pressure generating cylinder ( second hydraulic pressure generating means)
29 Pressure receiving plate (pressure receiving part)
30 Pressing member (pressing part)

Claims (3)

A forging die double-acting system comprising an upper die and a lower die that pressurize the forging material from above and below, and a pair of opposing side dies that advance and press the forging material from both sides,
Driving means for raising and lowering the upper mold;
A lower die hydraulic cylinder for raising and lowering the lower die;
A pair of side type hydraulic cylinders for advancing and retracting each of the side types;
A first hydraulic mechanism for operating the hydraulic cylinders for the upper Symbol both side type,
And a second hydraulic mechanism for actuating the upper Symbol lower die hydraulic cylinder,
The first hydraulic mechanism receives the driving force of the driving means from the upper mold holder that holds the upper mold so that the both side molds advance in conjunction with the lowering of the upper mold from the rising end. Comprising first hydraulic pressure generating means for generating hydraulic pressure to be transmitted to the side type hydraulic cylinder;
The second hydraulic mechanism includes second hydraulic pressure generating means for receiving a driving force of the driving means from a pressing portion provided in the upper mold holder and generating hydraulic pressure transmitted to the lower hydraulic cylinder.
The both side molds move forward in conjunction with the lowering of the upper mold from the rising end, and the lower mold rises in conjunction with the lowering of the upper mold after the upper mold descends a predetermined distance from the rising end. The upper mold so that the pressing part of the upper mold holder and the pressure receiving part of the second hydraulic pressure generating means corresponding to the pressing part come into contact with each other when the upper mold descends a predetermined distance from the rising end. A double-acting system for forging dies characterized by being vertically spaced at the rising end of the forging die. In claim 1,
The first hydraulic mechanism includes a hydraulic pressure generating cylinder as the first hydraulic pressure generating means, and a forging member that is connected to a piston rod of the hydraulic pressure generating cylinder and that projects downward from the upper mold holder. Mold double-acting system. In claim 1 or claim 2,
The double acting system for a forging die, wherein the first hydraulic mechanism includes a pressure adjusting valve for adjusting a pressure applied to the forging material by the both side dies to a predetermined value.

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