KR20100030692A - Isostatic press-forming apparatus - Google Patents

Abstract

PURPOSE: An isostatic press-molding apparatus is provided to stabilize the temperature of a mold to maintain a work piece. CONSTITUTION: An isostatic press-molding apparatus comprises the following: an inserting station which inserts a work piece; a pre-heating station(18) which pre-heats the inserted work piece; a press-molding station(22) which press-molds the pre-heated work piece; a discharge station which discharges the press-molded work piece; and a conveying member moving the work piece from the inserting station to the discharge station.

Description

Isostatic press-forming apparatus

The present invention relates to an apparatus for forming a workpiece by heating and isotropically pressing a high temperature liquid.

BACKGROUND ART An apparatus for receiving a work in a pressure vessel, supplying a liquid in a state where the pressure vessel is sealed, and applying pressure to the work through the liquid, is known. In this case, isotropic pressure can be realized by pressurizing through the liquid. In addition, when a liquid is made into high temperature, it can also pressurize, heating. Patent Literature 1 discloses an apparatus that performs isotropic pressure while heating as described above.

By using such an apparatus, shaping | molding of laminated electronic components, such as a multilayer capacitor, is performed. The multilayer capacitor is produced by alternately stacking a sheet of a conductor having a predetermined shape and a ceramic green sheet, pressing and heating at the same time to cure the binder between the layers, and firing the ceramic. The conductor of a predetermined shape becomes an electrode, and the fired ceramic layer becomes an insulator. In practice, this is cut out into a predetermined shape and used as a circuit element. In a state where the conductor sheet and the ceramic green sheet are laminated, the green sheet is soft and the shape does not become constant.

Like the green sheet described above, the workpiece before the processing is indeterminate requires a mold for holding the workpiece in a predetermined shape until the end of the processing. In the case of the said laminated body, in order to hold the laminated sheet before a process in plate shape as a mold, the plate-shaped member which mounts this is used. When raising the workpiece and the mold to a predetermined temperature during processing in the pressure vessel, the time to occupy the pressure vessel becomes long, and productivity cannot be increased. Patent Literature 2 discloses a technique of preheating the workpiece and the holding means prior to press molding to shorten the occupancy time of the pressure vessel.

[Patent Document 1] Japanese Utility Model Publication No. 04-044358

[Patent Document 2] Japanese Patent Publication No. 2002-035995

After the process of heating and pressurization is complete | finished, a mold may become hot and may interfere with the operation which removes a to-be-processed object from a mold. In addition, when the hot mold is reused, the workpiece receives heat from the mold and warms prematurely, and the hysteresis of the temperature rise is different from when the mold is cooled. For this reason, for example, after the initial stage of operation of the apparatus and a sufficient time after the operation have elapsed, processing conditions relating to temperature are different, and the quality of the product may not be stable.

An object of the present invention is to stabilize the temperature of a mold holding a workpiece.

[Means for solving the problem]

The isostatic pressure molding apparatus of the present invention cools the mold stored in the cooling bath after removing the mold in the state where the workpiece is set from the pressure vessel. By cooling the workpiece before removing it from the mold, the mold is not hot in the work to be removed from the mold, thereby making it easy to work.

In addition, the cooling tank can be arrange | positioned under the position which carries out the to-be-processed object set to the mold removed from the said isotropic pressure-molding apparatus.

Further, a water removal section for blowing out air droplets or the like adhering to the workpiece taken out from the cooling tank can be arranged between the carrying out position of the workpiece and the cooling tank.

In the isotropic pressure forming apparatus which is pressurized while heating to perform molding, the temperature of the mold holding the workpiece can be lowered, and the temperature condition of the mold can be stabilized.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described along drawing. 1 is a plan view showing a schematic arrangement of each work position of the isotropic pressure forming apparatus 10. As shown in the drawing, the swing arm 12 has a three-pronged shape, and the swing table 14 on which the basket holding the workpiece is supported is supported on the tip of each arm. The position of the lower right turn table 14 shown in the figure is an import / export station 16 which carries in the workpiece before processing and carries out the workpiece after processing. In addition, the left table position shown in the figure is a preheating station 18 for preheating the workpiece. Below the swing table 14, the preheating tank 20 in which the preheating liquid was stored is arrange | positioned. Although details are mentioned later, the to-be-processed object is put into the preheating tank 20, and is preheated in the state put on the basket. In addition, the position of the swing table 14 in the upper right shown in the figure is the press molding station 22 to which press molding is performed. The pressure container 24 is arrange | positioned under this turning table 14, and the liquid used as a medium of pressure is stored in the pressure container 24. As shown in FIG. In addition, the pressure vessel 24 is immersed in the liquid in the thermostat 26. In addition, when the isotropic pressure forming apparatus 10 is viewed in a plan view, that is, in the plan view of FIG. 1, the workpiece to be removed from the pressure vessel 24 is cooled at the same position as the loading / exporting station 16. Cooling station 28 is located. In fact, the cooling station 28 is located below the loading / exporting station 16, and a cooling tank storing liquid for cooling the workpiece or the like is disposed below the turning table 14 in the lower right corner shown. have.

FIG. 2 is a diagram showing portions of the loading and unloading station 16 and the cooling station 28 of the isotropic pressure forming apparatus 10. When the revolving table 14 is in the position shown in the figure, the basket 32 on which the plurality of workpieces are placed is placed on the revolving table 14, and the workpiece is carried into the molding apparatus 10. Lose. Since the laminated body 34 (refer FIG. 3) which alternately laminated | stacked the conductor which is a to-be-processed object, and a ceramic green sheet is soft and deform | transformed before processing, the mold 36 (FIG. 3) for making the shape of this laminated body constant Ref.). As shown in FIG. 3, the laminated body 34 is substantially rectangular flat plate shape, The mold 36 is provided with the recessed part 38 in which the laminated body 34 is accommodated exactly. The workpiece, that is, the laminate 34, is set in the mold 36, and a plurality of workpieces are accommodated in the basket 32. In this state, the basket 32 is placed on the swing table 14. Since the laminated body 34 sent to the cooling station 28 is heated and pressurized by the pressure container 24, and it was taken out here, the cooling station 28 is demonstrated later. In the loading / unloading station 16, the basket placed on the swinging table 14 is sent to the preheating station 18 by the rotation of the swinging arm 12.

FIG. 4 is a view showing the preheating station 18 and the press forming station 22 of the isostatic pressure forming apparatus 10. About other parts, the outline is shown. The basket 32 is sent from the loading / unloading station 16 to the preheating station 18 by turning the turning table 14. In the swing of the swing table 14, the reciprocating motion of the table swing cylinder 40 constituted by the hydraulic cylinder is converted to the swing motion by the rack and pinion mechanism 42, which is the swing column 44. , Swing arm 12, swing table 14. When the basket 32 is sent to the preheating station 18, it is engaged with the hanging hook 48 which is lowered by the hanging cylinder 46 constituted by the hydraulic cylinder, and also the hanging cylinder 46. Lifted by). The pivot table 14 is pivoted and retracted from directly under the basket 32. The hanging hook 48 descends with the basket 32 suspended, and puts the basket 32 on the lifting table 50. The lifting table 50 is lowered by the lifting cylinder 52 constituted by the hydraulic cylinder, whereby the basket 32 is fed into the preheating tank 20. In the preheating tank 20, a liquid, for example, water, heated to a predetermined temperature, is stored, and the laminate 34, the mold 36, and the basket 32 are pressed into the press forming station 22 by the liquid. Before being added to, it is heated in advance. After completion of the heating for a predetermined time, the elevating table 50 is raised, and the basket 32 is suspended from the hanging hook 48. Below this, the revolving turning table 14 is sent, and the basket 32 is placed on this by the lowering of the hanging hook 48. And the turning table 14 turns, and the basket 32 holding the laminated body 34 and the mold 36 is sent to the press molding station 22.

In the press forming station 22, the basket 32 is engaged with a hanging hook 56 fixed to the bottom of the pressure vessel upper lid 54. The upper cover 54 is suspended by the chain 58 and is lifted by the lifting motor in the upper cover support column 60. The upper cover 54 raises the basket 32 a little, and the revolving table 14 pivots and retracts from underneath the basket 32. When the revolving table 14 is retracted, the upper lid is lowered, and the basket 32 holding the laminated body 34 and the mold 36 is introduced into the pressure vessel 24.

FIG. 5 is a view showing an outline of the preheating station 18 and the press forming station 22, in particular the pressure vessel 24, and the configuration around them. The upper cover 54 is provided with a pin hole 61 through which the pin 62 to be described later penetrates, and a circulation hole 63 connecting the bottom surface of the upper cover 54 with the pin hole 61 is provided. The basket 32 suspended from the upper lid 54 is lowered together with the upper lid 54 and introduced into the pressure vessel 24. When the upper lid 54 blocks the opening of the container, the pin 62 is pinned. The pressure vessel 24 is sealed by being inserted into the hole 61 and penetrating through the upper lid 54, as shown in FIG. On the other hand, when the pressure vessel 24 is open, the liquid in the thermostat 26 opens the circulation valve 66 and is sent into the pressure vessel 24 by the circulation pump 64. The liquid overflowed from the pressure vessel 24 returns to the thermostat 26 again. Even when the pressure vessel 24 is covered by the upper cover 54, in the state where the pin 62 is not inserted into the pin hole 61, the fluid passes through the circulation hole 63 and the thermostat 26 ), The reflux of the liquid is maintained. Thereby, the temperature control of the to-be-processed object suspended in the upper cover 54 can be performed with more precision. When the pin 62 is inserted into the pin hole 61 of the upper cover, and the circulation hole 63 is blocked, the circulation valve 66 is closed.

Since the laminate 34 (workpiece), mold 36 and basket 32 introduced into the pressure vessel 24 is already preheated and the temperature is high, the laminate 34 is immersed in the liquid, Pressurization can be started. After closing the circulation valve 66, the boost pump 68 is driven to send the liquid in the thermostat 26 to the pressure vessel 24, thereby increasing the pressure in the vessel. When the predetermined pressure is reached, this pressure is maintained for a predetermined time. In the meantime, the laminated body 34 is press-molded and hardened by the heating and pressurization by a liquid. When a predetermined time elapses, the circulation valve 66 is opened to release the pressure in the pressure vessel 24. On the discharge side of the boosting pump 68, a backflow prevention valve 70 is provided to prevent backflow when the boosting pump 68 is not operating.

After the pressure is released, the pin 62 is pulled out, the basket 32 is raised together with the upper lid 54, the pivot table 14 is pivoted and placed thereon. Then, the swing table 14 is pivoted and the basket 32 holding the workpiece is sent to the carry-in / out station 16.

On the discharge side of the circulation pump 64, a preheating tank liquid transfer pipe 72 for sending fluid to the preheating tank 20 is connected to the front of the circulation valve 66. The preheating tank liquid conveying path formed by this preheating tank liquid conveying pipe 72 is provided with two valves 74 and 76 for adjusting the flow rate of the liquid sent to the preheating tank 20. These two valves 74 and 76 adjust the amount of liquid transfer to the preheating tank 20. The preheating tank liquid transfer path main valve 74 which is one valve opens when the circulation valve 66 is closed, and closes when it opens open conversely. That is, these valves 66 and 74 are selectively opened either one. Then, when no fluid is sent to the pressure vessel 24, the fluid is sent to the preheating tank 20, whereby the temperature of the fluid in the preheating tank is managed. The excess fluid in the preheating tank 20 overflows from the communication opening 78 and returns to the thermostat 26.

The preheating tank liquid transport channel sub-valve 76, which is another valve provided in the preheating tank liquid transport path, is disposed in parallel to the main valve 74. The sub valve 76 is provided to maintain a predetermined amount of fluid being sent to the preheating tank 20 even when the main valve 74 is closed. When the circulation valve 66 and the sub valve 76 are opened together, the flow rate passing through the sub valve 76 is set less than the flow rate of the circulation valve 66, so that the temperature management in the pressure vessel 24 takes precedence. do. However, since fluid is sent to the preheating tank 20 at this time, the fall of the temperature of the preheating tank 20 can be prevented or suppressed. The sub valve 76 is always in the open state in the present embodiment, but may be closed when the main valve 74 is opened. As the sub-valve 76, a valve capable of adjusting the flow rate is used so as to cope with a change in the operating conditions of the isotropic pressure forming apparatus 10. However, it is also possible to simplify the configuration by replacing it with a configuration in which the flow rate adjustment cannot be performed, such as an orifice, a valve that can be turned on and off only. However, the provision of two valves, the main valve 74 and the sub-valve 76, provides a small flow rate adjustment when the liquid is also transferred to the preheating tank 20 in parallel to the supply of the fluid to the pressure vessel 24. This is for the purpose of facilitating the flow rate easily. If the flow rate can be adjusted well even at a low flow rate of the main valve, the configuration may be provided only with this.

2, the operation in the cooling station 28 will be described. The basket 32 sent from the press forming station 22 is attached to the hanging hook 86 which is lifted and lowered by the loading and unloading station 16, that is, the lifting cylinder 84 disposed directly above the cooling station 28. Hang The lifting and lowering cylinder 84 lifts the basket 32, the pivoting table 14 turns, and retracts from underneath the basket 32. As shown in FIG. The lifting cylinder 84 lowers the basket 32 and soaks the laminate 34 in a liquid such as water in the cooling tank 30. After a predetermined time has elapsed, the basket 32 is lifted up, and air is blown out by the air blower 88 to blow off the liquid attached to the laminate 34, the mold 36, and the basket 32. Again, the basket 32 is lifted to a position higher than the swing table 14, the swing table 14 is pivoted, and a basket is placed thereon.

The cooling station 28 is provided with a cooling unit 90 that cools the liquid in the cooling tank 30. The cooling unit 90 circulates the low-temperature refrigerant through the heat exchange coil 92 disposed in the cooling tank 30 to lower the temperature of the liquid in the cooling tank. Moreover, the temperature sensor 94 which detects the temperature of the liquid of a cooling tank is provided, and the control of the cooling unit 90 is performed based on the detection value of this sensor.

The laminated body 34 is taken out from the basket 32 which returned to the loading / unloading station 16 via the cooling station 28 in the state set in the mold 36. The processed laminate 34 is removed from the mold 36 and sent to the next step. Moreover, the laminated body 34 before a new process is set to the mold 36, and it is carried in again.

In the present embodiment, the swing table 14 is capable of turning in a range of 120 °, and when the basket 32 is sent to the next station, the swing table 14 returns to the previous station and receives the next basket 32. . In addition, the position where the revolving table 14 rotated 60 degrees from the position in FIG. 1 is a retracted position. When press-molding is performed by the press molding station 22, preheating is performed by the preheating station 18 in parallel. In addition, in the loading / unloading station 16 and the cooling station 28, the press-molded laminate 34 is first cooled together with the mold 36, and then carried out for each basket 32 after cooling. And the laminated body 34 set to the mold 36 to be processed next is carried in the state accommodated in the basket 32.

When the turning table 14 turns, the three turning tables 14 convey the basket 32 to the next station, respectively. In addition, when one basket 32 is noticed, the movement between each station draws an arc, and the direction of movement is one direction clockwise in FIG.

As mentioned above, although the isotropic pressure shaping | molding apparatus 10 of this embodiment conveys the basket 32 from the turning table 14 which rotates in the forward and reverse directions in the range of about 120 degrees, the table is 1 It can also be made to rotate continuously only in a direction. It is also possible to arrange stations of import and export independently.

In addition, when performing press molding of a workpiece which does not require preheating, the turning table 14 may be reversed to be sent directly from the loading and unloading station 16 to the pressing forming station 22. After completion of the press molding, the swing table 14 is pivoted in the forward direction and returned to the loading and unloading station 16. In addition, when cooling after press molding is necessary, the preheating tank 20 can be used as a cooling tank. In this case, circulation of the liquid between the preheating tank 20 and the thermostat 26 is stopped, and temperature management is performed independently of each other. After press molding, the revolving table 14 is reversed again, the basket 32 is moved to the upper position of the preheating tank 20, and the cooling is performed by feeding into the preheating tank 20. After completion of cooling, the swing table 14 is reversed, and the basket 32 is returned to the loading and unloading station 16.

7 is a time chart of processing in each station. Indicates the processing of the loading / exporting station 16 and the cooling station 28. First, the pivot table 14 is rotated to receive the basket 32 from the press forming station 22. The basket 32 is raised to retract the pivot table 14 once. Then, the basket 32 is lowered and put into the cooling tank 30. After cooling for a predetermined time, the basket 32 is raised to remove moisture. In addition, the basket is raised, the evacuated turning table 14 is returned, and the basket 32 is placed thereon. Here, the basket 32 is taken out, and a new basket 32 is carried in and placed on the turning table 14. Then, the swing table 14 is retracted. This evacuation is to prevent the turning table from being obstructed when lifting the basket at another station. Then, it waits until the next cycle. However, during this waiting, the pivoting table 14 rotates with the basket 32 raised in relation to the processing of the other station.

Indicates the processing of the preheating station 18. The swing table 14 is rotated, the basket 32 is received from the loading / unloading station 16, and the lift table 14 is lifted up to retract the swing table 14. Rotation and evacuation of the swing table 14 are synchronized with other stations. The basket 32 is retracted for a predetermined time while being lifted. After the predetermined time has elapsed, the basket 32 is lowered and put into the preheating tank 20. After the end of the preheating, the basket 32 is raised, and the revolving turning table 14 is returned, and the basket is placed thereon. The preheating time can be changed. In the control part which controls the operation | movement of the said isotropic pressure shaping | molding apparatus, the time to wait before preheating is calculated from the input preheating time. The operation in the preheating station is controlled based on this waiting time and the preheating time.

⒞ indicates the processing of the press molding station 22. The pivot table 14 is rotated to receive the basket 32 from the preheating station 18 and lifted to retract the pivot table 14. Rotation and evacuation of the swing table 14 are synchronized with other stations. The basket 32 is lowered under the upper cover 54 in a suspended state, and the upper cover is closed. The booster pump 68 boosts the pressure in the pressure vessel 24, maintains the pressure for a predetermined time, and then depressurizes it. The upper cover 54 is opened, the basket 32 is raised with this, and the turning table 14 which has been evacuated is returned, the basket 32 is lowered, and it is placed on it. The operation of returning the swing table 14 from the retracted position is performed in synchronization with the operation of the preheating station.

In this embodiment, the preheating tank and the cooling tank are provided separately, and it is possible to perform both preheating and cooling in a series of processing steps. However, as long as any one can be performed, any one of the preheating tank 20 and the cooling tank 30 of this embodiment can be removed. For example, when it is set as the structure provided only with the preheating tank 20, when preheating is needed, the to-be-processed object is conveyed to the right direction in FIG. 1, after preheating, it is made to put into a pressure container, and when cooling is needed, it is left To be conveyed in the direction, and the work to be taken out from the pressure vessel is put into a preheating tank to be used as a cooling tank. When using a preheating tank as a cooling tank, the liquid filled in this cooling tank should not share the liquid of a thermostat. For this purpose, it is preferable to provide a fluid circuit device that independently circulates the liquid of the preheating tank (cooling tank) and performs temperature management.

[Appendix 1]

Import station which is a position to import a workpiece,

A preheating station which is a position for preheating the imported workpiece;

A press forming station which is a position for isostatic pressing while heating a workpiece after preheating,

Carry-out station which is a position to take out the workpiece after press molding,

Conveying means for conveying the workpiece from the loading station to the loading station via the preheating station and the press molding station so that the locus between the stations is in one direction without overlapping;

To have,

When preheating is unnecessary, the isostatic pressure molding apparatus moves the conveying means in the reverse direction and conveys the workpiece from the loading station to the press forming station directly.

[Supplementary Note 2]

An isotropic pressure forming apparatus which accommodates a workpiece in a pressure vessel filled with a liquid, pressurizes and heats the liquid by sealing the pressure vessel,

A thermostat in which the liquid for keeping the pressure vessel is stored, the liquid containing the pressure vessel,

A preheater in which a liquid is stored for preheating the workpiece before it is received in the pressure vessel,

A single pump which sends the liquid of the thermostat to the pressure vessel and the preheater, and circulates the fluid between the thermostat and the pressure vessel, the thermostat and the preheater,

A pressure vessel and a liquid transfer control device for controlling the supply of fluid to the preheating tank,

Take it,

The liquid transfer control device is an isostatic pressure molding device that controls the fluid to be sent to the preheating tank when the liquid is sent to the pressure vessel.

1 is a plan view showing a schematic configuration of an isostatic pressing apparatus of this embodiment.

Fig. 2 is a side view showing the loading and unloading station and the cooling station portion of the isotropic pressure forming apparatus of this embodiment.

3 is a view showing a laminate as a workpiece and a mold for holding the laminate.

Fig. 4 is a front view showing a preheating station and a press forming station part of the isostatic pressing apparatus of this embodiment.

Fig. 5 is a schematic configuration diagram of a pressure vessel of a press molding station, and in particular, a view showing a state in which a container is opened.

Fig. 6 is a schematic configuration diagram of the pressure vessel of the press molding station, in particular showing a state in which the container is closed.

7 is a time chart showing the processing operation in each station.

* Description of the sign *

10: isotropic pressure forming apparatus

14: turning table

16: import and export station

18: preheating station

20: preheater

22: press molding station

24: pressure vessel

26: thermostat

28: cooling station

30: cooling tank

32: basket

88: air blower

90 cooling unit

Claims (6)

The workpiece set in the mold is accommodated in a pressure vessel filled with a liquid together with the mold, and the pressure vessel is sealed, pressurized to the workpiece through the liquid, and further heated to As an isotropic pressure forming apparatus for molding, After the molding of the workpiece is finished, the isostatic pressing apparatus characterized by having a cooling tank for immersing the mold and the workpiece in a liquid to cool. The method according to claim 1, An isostatic pressure forming apparatus, wherein the cooling tank is disposed below a position at which the workpiece set in the mold, taken out from the pressure vessel, to be taken out from the isotropic pressure molding apparatus. The method according to claim 2, An isostatic pressure forming apparatus, wherein a water removing unit is provided between the discharge position of the workpiece and the cooling tank to blow out air droplets of the workpiece taken out of the cooling tank. The method according to claim 1, The cooling tank is an isostatic pressure forming apparatus, wherein the cooling tank can be converted into a preheating tank which is preheated to a predetermined temperature before the workpiece is accommodated in the pressure vessel. An import station which is a position for carrying in a workpiece, A preheating station which is a position for preheating the imported workpiece; A press forming station which is a position for isostatic pressing while heating a workpiece after preheating, Carry-out station which is a position to take out the workpiece after press molding, Conveying means for conveying the workpiece from the loading station to the loading station via the preheating station and the press molding station so that the locus between the stations is in one direction without overlapping; Has, When preheating is unnecessary, the isostatic press-molding apparatus characterized by moving the conveying means in the reverse direction to convey the workpiece from the loading station to the press-forming station directly. An isotropically pressurized molding apparatus which accommodates a workpiece in a liquid container filled with a liquid, pressurizes and heats the liquid by sealing the pressure container, A thermostat in which the liquid for keeping the pressure vessel is stored, and the pressure vessel is immersed in the liquid, A preheater in which a liquid is stored for preheating the workpiece before it is received in the pressure vessel; A single pump which sends liquid of the thermostat to the pressure vessel and the preheater, and circulates the fluid between the thermostat and the pressure vessel, the thermostat and the preheater, A pressure vessel and a liquid transfer control device for controlling the supply of fluid to the preheating tank, Has, The liquid transfer control device is an isostatic pressure forming apparatus characterized in that when the liquid is sent to the pressure vessel, the fluid is also sent to the preheating tank.

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