JP3677599B2 - Multistage pressurizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multistage pressurizing apparatus that heats and pressurizes a laminated sheet in which ceramic films for obtaining a multilayer capacitor are laminated, an unvulcanized rubber sheet, and the like with a mold.
[0002]
[Prior art]
The laminated sheet is arranged on a lower mold, and is integrally pressed by clamping the lower mold and the upper mold to become a pressure forming sheet for forming a capacitor.
By the way, in order to obtain a plurality of pressure sheets at once, a multistage pressure device is preferable. That is, for example, a plurality of movable plates are mounted on four columns so as to be movable up and down, a lower mold is arranged on the upper surface of each movable plate, an upper mold is arranged on the lower surface, and stacked on each lower mold. After placing the sheet, the lowermost movable plate is moved up by the hydraulic cylinder to reduce the distance between the movable plates, thereby continuously clamping the upper mold and the lower mold of each pair facing each other. it can.
[0003]
[Problems to be solved by the invention]
However, in a multi-stage pressurizing device that simply moves the lowermost movable plate upward, the uppermost upper die and the lower die are moved after the lowermost upper die and lower die are clamped. A large time difference will occur before the mold is clamped. For this reason, the pressure sheet formed by the upper mold and the lower mold at the lower position is heated for a longer time than the pressure sheet formed by both molds at the upper position. Therefore, a heated sheet having variations in quality may be obtained, and if the heating time is long, a defective pressure sheet may be obtained due to overcuring.
Although it is conceivable that all upper molds and lower molds are temporarily clamped and then each upper mold and the like are heated by the operation of the heater, it takes time until the molds are heated. The operating rate of will decrease.
An object of the present invention is to provide a multistage pressurizing apparatus capable of forming a pressurizing sheet excellent in quality with good workability.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises the following arrangement.
<Constitution>
A multi-stage pressurizing device for heating and pressurizing a sheet, wherein a plurality of movable members are supported so as to be movable up and down while being spaced apart from each other in a vertically extending support, and an upper portion of the support A plurality of lower molds having a fixing member fixed to the upper surface of the plurality of movable members, a plurality of lower molds each having a plate and a heater fixed and elastically levitated and supported by the sheet. A plurality of upper molds each having a heater fixed to the lower surface of each of the plurality of movable members and the lower surface of the fixed member so as to oppose each of the lower molds; The upper moving means for moving the lowest movable member in order to bring the molds closer to each other, the distance between the fixed member and the uppermost movable member, and the distance between the movable members are respectively opposed upper molds. To hold the tool and the lower mold in the specified proximity And pressurizing the upper and lower molds facing each other in close proximity so as to heat and press the sheet. And an energization control unit that controls energization of the heaters so that the upper mold and the lower mold are heated in advance before the operation of the upper moving unit is started.
[0005]
<Action>
The upper die and the lower die of each opposing pair is heated more heating data is moved upward the bottom of the movable member by upward movement means from. The mold interval regulating means regulates the movable member so that the movable member is held at a constant interval even when the lowermost movable member is moved upward. Therefore, the upper mold and the lower mold of each set are placed at predetermined predetermined positions. Retained. In this state, since each sheet is floated by the plate, it is not heated.
In this state, when the pressurizing unit further moves the lowermost movable member, the upper mold and the lower mold of each set are close to each other and are clamped almost simultaneously. Therefore, each sheet can be heated simultaneously.
The upper moving means and the pressurizing means for moving the lowest movable member up may be constituted by one hydraulic cylinder. Further, the upward moving means may be constituted by an auxiliary hydraulic cylinder, and the pressurizing means may be constituted by a main hydraulic cylinder.
Further, the mold interval regulating means may be constituted by a hydraulic cylinder attached to each movable member side, and the interval between the movable members may be regulated by the protruding amount of the piston rod.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a multistage pressurizing apparatus according to the present invention. The pressurizing device 100 includes four support columns 50 (only two on the front side are shown in the figure). These struts 50 are fixed at a lower end to a lower mounting base 51 and extend upward, and each upper end is fixed by a fixing block 52.
A pair of sliding bodies 53A, 53B, and 53C for connecting these columns to each other are fitted to the front column 50 and the back column (not shown). The movable plate 54A is fixed to the pair of sliding bodies 53A and 53A, the movable plate 54B is fixed to the pair of sliding bodies 53B and 53B, and the movable plate 54C is fixed to the pair of sliding bodies 53C and 53C. Yes.
[0007]
On each of the movable plates 54A to 54C, a placing table 55 that can be pulled out to the near side in the drawing is arranged, and each placing table 55 is positioned by a positioning cylinder 56 and fixed on the movable plate. A lower mold 30 is fixed on each mounting table 55.
Further, the upper mold 10 is fixed to the lower surface of the movable plates 54 </ b> A and 54 </ b> B and the lower surface of the fixed block 52 so as to face the lower mold 30.
A main hydraulic cylinder 57 is attached to the center of the attachment base 51. The ram of the main hydraulic cylinder 57 is connected to the lower surface of the lowermost movable plate 54C. A small hydraulic cylinder 58 is attached to each of the sliding bodies 53A to 53C, and the rod of each hydraulic cylinder 58 projects toward the upper sliding body and the lower surface of the fixed block 52.
[0008]
Here, the configuration of the upper mold 10 and the lower mold 30 will be described.
That is, as shown in FIG. 3, the upper mold 10 has an attachment base 11 and a mold body 12 that are fixed to a movable plate or the like. The mounting base 11 has a heat insulating portion 13, and the mold body 12 is mounted on the lower surface of the mounting base 11 via a mounting block 27.
A plurality of cartridge heaters 14 are embedded in the mold body 12, and a temperature sensor 15 is disposed between the heaters 14 and 14. A pressure plate 16 is fixed to the lower surface of the mold body 12, and a soft elastic member 17 is accommodated in the pressure plate 16.
[0009]
The mold body 12 is fitted into a frame-shaped side mold 18 so as to be movable up and down. The side mold 18 is suspended from a mounting block 27 via a bolt 19, and a coil spring 20 that elastically presses the side mold 18 downward is attached to the bolt 19. A cut die 21 is fixed to the lower side of the side die 18. The cut die 21 is formed in a rectangular shape, and a pressurizing plate 16 is fitted therein so as to be movable up and down. A cutting blade 22 is formed on the cut die 21 along the inner surface (pressure plate 16).
A vacuum holding cover 23 covers the lower side of the side mold 18 via an O-ring 24. The vacuum holding cover 23 is elastically suspended via a coil spring 28 fixed to the mounting block 27. The side mold 18 is provided with a vacuum port (not shown). The port passes through the side mold 18 and communicates with a suction path that opens at the lower surface of the cut mold 21. The suction path is connected to a vacuum pump 60 shown in FIG. 4 via a pipe line.
[0010]
The lower mold 30 has a heat plate 31, a plurality of cartridge heaters 32 are embedded in the heat plate 31, and a heat insulating portion 33 is provided. A mold body 34 is fixed on the hot plate 31. A plurality of support pins 36 that float and support a plate 35 on which the laminated sheet 40 is disposed are embedded in the mold body 34 so as to protrude. Clamp pins 26 for sandwiching the plate 35 are located immediately above the support pins 36, and each clamp pin 26 is attached to the cut die 21.
The laminated sheet 40 is formed by arranging and laminating ceramic films on which a large number of electrodes are printed.
[0011]
Explaining the pressurizing operation by the mold, the heaters 14 and 32 of the upper mold 10 and the lower mold 30 are operated, and the mold main bodies 12 and 34 are heated in advance.
Next, in the mold clamping step, the vacuum holding cover 23 of the upper mold 10 is brought into contact with the mold main body 34 of the lower mold 30 while maintaining airtightness. In this state, the vacuum pump 60 is operated to evacuate the upper mold 10 and the lower mold 30.
Next, the lower mold 30 is further moved upward, the support pins 36 are moved backward while pressing the plate 35 by the clamp pins 26, and the plate 35 is positioned and fixed.
[0012]
When the lower die 30 is further moved upward, the cutting blade 22 of the cut die 21 bites into the edge of the laminated sheet 40 and makes a rectangular cut, while the pressure plate 16 is in sliding contact with the inner wall of the cut die 21. It moves downward and presses the soft elastic member 17 onto the laminated sheet 40. Thereby, the lamination sheet 40 can be integrated by heating-pressing.
[0013]
Next, the operation of the multistage pressurizing apparatus according to the present invention will be described with reference to the control block diagram of FIG.
In FIG. 4, the control unit 61 is provided on the control panel, and a proximity sensor 62 is connected thereto. The proximity sensor 62 is disposed on the lower surface on one end side of the fixed block 52 in FIG. 1 and is used to detect the rod of the hydraulic cylinder 58 attached to one sliding body 53A. An energization control unit 63 is connected to the control unit 61. Under the control of the energization control unit 63, the upper mold heater 14 and the lower mold 30 heater 32 (see FIG. 3) are energized. Further, a hydraulic unit 64 is connected to the control unit 61, and the hydraulic cylinder 57 and the plurality of hydraulic cylinders 58 are connected to the hydraulic unit 64 so as to be refuelable.
[0014]
First, a plurality of hydraulic cylinders 58 are operated by the hydraulic unit 64 under the control of the control unit 61, and each rod protrudes. Accordingly, the initial state shown in FIG. 1, that is, the movable plates 54A to 54C are held apart.
Next, the mounting table 55 is pulled out from each movable plate 54 </ b> A to 54 </ b> C, the laminated sheet 40 is positioned and arranged on each lower mold 30, and then the mounting table 55 is returned to each movable plate 54 </ b> A to 54 </ b> C. Fix it.
After the three laminated sheets 40 are thus arranged, the heaters 14 of the upper mold 10 and the heaters 32 of the lower mold 30 are energized through the energization control unit 63 under the control of the control unit 61, and both molds. 10 and 30 are heated in advance to, for example, 200 ° C.
[0015]
Next, the control unit 61 controls the hydraulic unit 64 to set the rod protrusion amounts of the plurality of hydraulic cylinders 58. That is, the rod position of each hydraulic cylinder 58 is set to the position shown in FIG.
Next, as shown in FIG. 2, the main hydraulic cylinder 57 is operated to cause the ram 57a to protrude. As a result, the lowermost movable plate 54C moves up, and the upper movable plates 54B and 54A also move up in this order. In this case, since the rod protrusion amounts of the plurality of hydraulic cylinders 58 are set, the distance between the movable plates 54A to 54C and the distance between the movable plate 54A and the fixed block 52 are regulated to be constant. When the interval is regulated in this way, the lower die 30 facing each upper die 10 can be brought close to the upper die 10 with an interval of, for example, 2 mm.
[0016]
When the lower molds 30 are brought close to each other as described above, the proximity sensor 62 outputs a detection signal because the rod of the hydraulic cylinder 58 attached to one sliding body 53A is close to the proximity sensor 62. Accordingly, the control unit 61 determines that all the upper mold 10 and the lower mold 30 are close to each other.
Next, the control unit 61 controls the hydraulic unit 64 to retract the rods of the plurality of hydraulic cylinders 58 and simultaneously operates the main hydraulic cylinder 57 to further protrude the ram 57a. Thereby, the upper mold 10 and the lower mold 30 which are close to each other are clamped almost simultaneously. Therefore, since the plurality of laminated sheets 40 are simultaneously heated and pressed as described above, a plurality of pressure sheets that are uniform and excellent in quality can be obtained simultaneously. At the time of mold clamping, the vacuum pump 60 is operated to evacuate the mold as described above.
[0017]
In the above embodiment, a pair of kicker hydraulic cylinders are mounted on the mounting base 51, and the movable plate 54C is moved upward by pressing the pair of sliding bodies 53C with these kicker hydraulic cylinders, and then the main hydraulic cylinder for mold clamping The movable plate 54 </ b> C may be further moved upward by actuating 57. In this case, since the kicker hydraulic cylinder is used, the movable plates 54C, 54B, 54A can be quickly moved up.
In the above embodiment, a three-stage pressurizing device is shown, but the present invention can be applied to a pressurizing device having two or more stages.
In addition, this invention can be utilized for the pressurization of the sheet | seat which needs to be heated like an unvulcanized rubber sheet.
[Brief description of the drawings]
FIG. 1 is a front view of a multistage pressurizing apparatus according to the present invention.
FIG. 2 is a front view of the apparatus when a mold interval is restricted.
FIG. 3 is a cross-sectional view of an upper mold and a lower mold of the apparatus.
FIG. 4 is a control block diagram of the apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Upper metal mold | die 30 Lower metal mold | die 40 Laminated sheet 50 Support | pillar 51 Mounting base 52 Fixed block 53A-53C Sliding body 54A-54C Movable plate 55 Mounting stand 56 Cylinder 57 Main hydraulic cylinder 58 Hydraulic cylinder 62 Proximity sensor 100 Pressurizing device

Claims (4)

A multistage pressurizing device for heating and pressurizing a sheet,
A plurality of movable members that are supported so as to be movable up and down while maintaining an interval on a support extending in the vertical direction;
A fixing member fixed to the upper portion of the support;
Each fixed to the upper surface, and a plurality of lower mold that have a said plate and heater sheet is being mounted resiliently floatingly supported in the plurality of movable members,
A plurality of upper molds each having a heater fixed to the lower surface of each of the plurality of movable members other than the lowest and the lower surface of the fixed member so as to face each of the lower molds;
An upper moving means for moving the lowermost movable member upward so as to make the upper and lower molds facing each other approach each other;
Mold interval regulating means for regulating the interval between the fixed member and the uppermost movable member and the interval between the movable members so as to hold the opposed upper mold and lower mold in a predetermined proximity position;
A pressurizing means for further moving the moved up lowermost movable member and clamping the adjacent upper and lower molds to heat and press the sheet ;
An energization control unit for energizing the heaters to preheat the upper mold and the lower mold before the operation of the upper moving means;
A multi-stage pressurizing device comprising:   2. The multistage pressurizing apparatus according to claim 1, wherein the sheet is a laminated sheet for forming a multilayer capacitor.   The multistage pressurizing apparatus according to claim 1, wherein the upper moving means and the pressurizing means are one hydraulic cylinder.   2. The multistage pressurizing apparatus according to claim 1, wherein the mold interval regulating means is a hydraulic cylinder attached to each movable member side.

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