JP3622995B2 - Molded body manufacturing equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a molded body manufacturing apparatus. More specifically, the molded body formed by pressure molding can be easily taken out without damaging it, and the molded body is manufactured at a higher yield of molded body manufacturing. It is related with the molded object manufacturing apparatus which can be used.
[0002]
[Prior art and problems to be solved by the invention]
A multilayer capacitor is known as an example of a conventional multilayer body. This multilayer capacitor is formed by forming a plurality of layers of internal electrodes inside a ceramic unit, and forming external electrodes electrically connected to the internal electrodes at both ends thereof.
[0003]
As a method of manufacturing such a multilayer capacitor, conventionally, a plurality of electrodes having a predetermined shape, for example, a rectangular shape, are formed on a ceramic green sheet, and a plurality of green sheets each having such a plurality of electrodes are formed. A method of pressure-bonding a laminated sheet formed by lamination with a rigid press is known. In the crimping process using a rigid press, a green sheet with internal electrodes or green sheets without internal electrodes is placed by putting a laminate molding sample in a lower mold of a mold and pressing the laminated sheet with an upper mold. And a green sheet having internal electrodes are pressure-bonded and integrated. After the pressure-bonding integration, the obtained ceramic laminate is cut into a predetermined shape, for example, a rectangular parallelepiped, into a chip, which is fired, and then external electrodes are formed on both sides.
[0004]
However, there is a difference in the thickness of the sheet between the portion where the internal electrode is formed and the portion where the internal electrode is not formed. Therefore, the method of pressure bonding using a rigid press does not increase the molding density of the portion where the internal electrode is not formed. There is a problem in that layer peeling easily occurs in this portion.
[0005]
In particular, as the number of stacked green sheets increases, the density difference at the time of pressure bonding becomes more conspicuous, and the influence is greater. For this reason, in the case of manufacturing a multilayer body such as a multilayer multilayer capacitor, there is a problem that a defective product is likely to be generated due to defective crimping and a yield is deteriorated.
[0006]
In addition, since the crimping method using a rigid press causes distortion in the mold when pressurized, the method of applying force differs depending on the position of action between the upper mold and the lower mold, and the pressure is likely to be uneven. It is a cause of delamination.
[0007]
In addition, when crimping with a rigid press, the chip after firing becomes a nearly complete rectangular parallelepiped, and when external electrodes are formed on the chip, it protrudes from the rectangular parallelepiped by the thickness of the external electrode, which reduces the mountability to the substrate. There is also the problem of doing.
[0008]
This inventor is a pressure molded body manufacturing apparatus for solving such problems, a pressure vessel body having a recessed portion, a lid member having a protruding portion closely fitted in the recessed portion, and the recessed portion The elastic member that is formed on the protruding portion side and divides into a laminated sheet accommodating space for accommodating the laminated sheet and a pressure medium accommodating space, and the protruding portion may protrude from the recessed portion during pressure molding. The pressure-molded body manufacturing apparatus provided with a fixing member that restricts the lid member so as not to be examined, and its improvement are also studied.
[0009]
In this pressure molded body manufacturing apparatus, a mold containing a laminated sheet made of a plurality of green sheets is disposed in the laminated sheet accommodating space, and a pressure medium is press-fitted into the pressure medium accommodating space. The laminated sheet is pressed between the elastic member and the surface of the protruding portion facing the elastic member, and a laminated body is formed after pressing for a predetermined time.
[0010]
In this pressure molded body manufacturing apparatus, when the laminated body obtained after pressure molding the laminated sheet is taken out from the mold, the peripheral edge of the laminated body is firmly bonded to the inner peripheral surface of the mold. It has been found that there is a problem that it is very difficult to take out the laminate from the mold. If the laminate is forcibly removed from the mold, the peripheral edge of the laminate is often damaged, and a laminate without damage cannot be produced with good yield.
[0011]
Moreover, the thickness of the laminated body manufactured with such a press-molded body manufacturing apparatus will be 1-5 mm, if the example is given, and the length of one side of a laminated body is 50-300 mm. Accordingly, the diameter of the concave portion for manufacturing a laminate having such a size is 7 to 50 cm in many cases, although it varies depending on the scale of the apparatus. Moreover, the depth of the recessed part is 1-7 cm. The outer diameter of the lid member provided with the protruding portion that is tightly fitted into the recessed portion of such a scale is usually 10 to 70 cm. The lid member is supported in a cantilevered state, and the lid member can rotate from the upper part of the opening of the pressure vessel body to a position retracted from the upper part of the pressure vessel body, and in the opposite direction. It can be done.
[0012]
Since the lid member is supported in a cantilever state, the lid member is often in a very slightly inclined state. When the lid member, which is in a slightly inclined state by being supported in a cantilever state, is lowered and an attempt is made to insert the protrusion into the recess, the protrusion is not smoothly inserted into the recess. The edge of the part often hit the inner peripheral surface of the recessed part. If the protrusion is forcibly inserted into the recessed part while the edge of the protruding part hits the inner peripheral surface of the recessed part, the inner peripheral surface of the recessed part will be damaged, and the tight fit when the protruding part is attached to the recessed part It causes the problem of being damaged.
[0013]
Further, when the protruding portion is mounted in the recessed portion, there is no escape space for the air in the recessed portion, so the air in the recessed portion is compressed by inserting the protruding portion. Since the resistance of the compressed air is large, a considerable force is required to completely insert the protruding portion into the recessed portion, and the size of the device is inevitably increased. Even if the protrusion has been completely inserted into the recess, the next time the protrusion is pulled out from the recess, the inside of the recess is decompressed by pulling out the protrusion, making it very difficult to pull out the protrusion. .
[0014]
The present invention has been completed based on the above circumstances.
[0015]
That is, an object of the present invention is to solve the above problems.
[0016]
An object of the present invention is to provide a molded body manufacturing apparatus that can take out a molded body obtained by pressure molding in a complete form without damaging it, and can manufacture the molded body with good yield. .
[0017]
Another object of the present invention is to easily and smoothly attach and detach the insertion body to and from the recessed portion without causing trouble when the insertion body is inserted into and attached to or removed from the recessed portion of the pressure vessel body. It is providing the molded object manufacturing apparatus which can be performed.
[0018]
An object of the present invention is to easily and smoothly attach and detach the lid member to and from the recessed portion without causing trouble when the insertion body is attached to or removed from the recessed portion of the pressure vessel body. In addition, an object of the present invention is to provide a molded body manufacturing apparatus capable of removing a gas generated during pressure molding and thereby manufacturing a molded body having no scratches such as voids and cracks with a high yield.
[0019]
[Means for Solving the Problems]
The invention according to claim 1 for solving the above-mentioned problem is as follows.(1) (a) A cylinder formed by a cylinder body having an internal space in a penetrating state and a bottomed cylinder bottom body having an internal space larger than the internal space of the cylinder body, and a piston inserted into the cylinder, (b) By inserting the piston into the cylinder, a pressurized material accommodation space is formed by the inner peripheral surface of the cylinder and the tip surface of the piston,
(c) Piston driving means for causing the piston to advance in the internal space of the cylinder body by press-fitting air into the internal space of the cylinder bottom body; and
(d) An insertion body comprising piston regulating means for preventing the piston from being pushed out of the cylinder when pressurizing the pressurized material accommodating space;
(2) A recessed portion having an inner end surface facing an opening that allows the insertion main body to be inserted, and a molding material accommodated in the pressurized material accommodating space when the insertion main body is inserted into the recessed portion. A pressure medium is press-fitted into a pressure medium accommodating space formed by a liquid-tight elastic member, an elastic member, an inner peripheral surface of the concave portion, and the inner end surface at a position in the concave portion that directly contacts the concave portion. And pressurizing means pressure vessel body for pressurizing the molding material accommodated in the pressurized material accommodating space through the elastic member by press-fitting a pressure medium,
(3) Fixing means comprising a regulating member for fixing the pressure vessel main body and the insertion main body inserted into the recessed portion at the time of pressure moldingA molded body manufacturing apparatus characterized by comprising:
According to a second aspect of the present invention, the cylinder includes an air lead-in / out means for exhausting air in the pressurized material accommodation space and introducing air into the pressurized material accommodation space. The molded body manufacturing apparatus according to claim 1,
Claim3The invention according to claim 1 is the molded body manufacturing apparatus according to claim 1 or 2, further comprising a material heating means for heating the inside of the pressurized material accommodation space.
[0020]
[Action]
The molded body manufacturing apparatus of the present invention is operated as follows.
[0021]
Before performing the pressure molding operation, the fixing means is in a position retracted from the pressure vessel main body and the insertion main body. Further, the insertion body is in a state of being detached from the recessed portion of the pressure vessel body.
[0022]
A molding material is accommodated in a pressurized material accommodation space formed by the inner peripheral surface of the cylinder and the tip end surface of the piston.
[0023]
The insertion body in a state where the molding material is accommodated in the pressurized material accommodation space is inserted into the recessed portion of the pressure vessel body. Simultaneously with this insertion, the air in the pressurized material accommodation space is exhausted by the air lead-in / out means. If it does so, the inside of the closed space formed with the elastic member in a recessed part, the internal peripheral surface of a recessed part, the insertion front end surface of a cylinder, and the end surface of a piston will be pressure-reduced. Since the atmospheric pressure is applied to the outside of the insertion body, the pressure in the closed space is reduced, so that the insertion body is pushed into the atmospheric pressure and quickly inserted into the recess.
[0024]
By inserting the insertion body into the recessed portion, the pressure container body and the insertion body are fixed by the fixing means after the insertion of the insertion body to the pressure container body is completed.
[0025]
Next, a pressure applied by the pressurizing means is applied to the molding material via the elastic member. The applied pressure is also applied to the end face of the piston through the molding material. The force applied in the direction of retracting the piston itself from the elastic member is applied by the pressure applied to the end surface of the piston, but the piston restricting means provided in the cylinder causes the piston to retract from the elastic member. Be blocked. The applied pressure applied to the end face of the piston is applied to the cylinder itself via the piston, and acts as a force for detaching the cylinder from the recess. However, since the insertion body having the cylinder and the piston is fixed by the fixing means, and the pressurized container body itself is also fixed by the fixing means, the insertion body may be detached from the recessed portion by the applied pressure. In addition, the pressurized container body does not come out of the fixed insertion body. As a result, since the pressurized container body and the insertion body are fixed by the fixing means, the applied pressure applied by the pressing means is applied to the pressurized material in the pressurized material accommodation space, The pressure molding is performed.
[0026]
During the pressure molding, the pressurized material can be fired by heating by heating the pressurized material with a heating means.
[0027]
During the pressure forming operation of the pressurized material, the air contained in the pressurized material or the gas generated by heating by the heating device is discharged by exhausting the air in the material housing space by the air lead-in / out means. It is discharged from the storage space. Therefore, voids and cracks due to residual gas are not generated in the obtained molded body.
[0028]
After a predetermined time has elapsed since the pressurization of the pressurizing material by the pressurizing unit, the pressurizing operation by the pressurizing unit is stopped.
[0029]
Next, the fixing means is retracted from the pressurized container main body on which the insertion main body is mounted.
[0030]
Next, the insertion body is removed from the recessed portion of the pressure vessel body. At this time, air is introduced into the material accommodation space by the air lead-in / out means, and the pressure inside the material accommodation space is made larger than the atmospheric pressure. Due to the air pressure in the material accommodating space, the insertion body is quickly detached from the recessed portion.
[0031]
After the insertion body is detached from the pressure vessel body, the piston drive means is driven to push out the molded body housed in the material housing space from the material housing space with the piston.
[0032]
Since the material accommodating space is formed by the inner peripheral surface of the cylinder and the tip end surface of the piston, the molded body accommodated in the material accommodating space is pushed out of the material accommodating space by the tip end surface of the piston, and the tip of the piston The molded body placed on the surface does not break at the periphery.
[0033]
After the molded body is pushed out from the material accommodating space, the piston is returned to its original state to prepare for the next molding operation.
[0034]
【Example】
Hereinafter, the present invention will be described in more detail by describing an embodiment of the present invention with reference to the drawings.
[0035]
As shown in FIG. 1, a molded body manufacturing apparatus 1 according to an embodiment of the present invention includes a pressure vessel main body 2, an insertion main body 3, and a yoke 4 as a fixing means.
[0036]
The pressure vessel main body 2 forms a substantially cylindrical body having an upper end surface, a circumferential outer surface, and a lower end surface. On the lower end surface of the pressure vessel main body 2, a substantially circular recessed portion 5 having an opening that opens at the lower end surface and an inner end surface that faces the opening is provided.
[0037]
An elastic member 6 is stretched inside the recessed portion 5 so as to bisect the recessed portion 5 into a space on the opening side and a space on the inner end face side.
[0038]
A pressure medium accommodation space 7 is formed by the elastic member 6, the inner end surface, and the inner peripheral surface of the recessed portion 5. A pressure medium such as a pressurized liquid is press-fitted into the pressure medium accommodating space 7. Since the pressure medium must be liquid-tightly filled in the pressure medium accommodating space 7, the elastic member 6 is stretched in the recess 5 in a liquid-tight manner.
[0039]
In this embodiment, as will be described later, when the insertion body 3 is inserted into the recessed portion 5, it directly contacts the molding material accommodated in the material accommodation space. Since this elastic member 6 has moderate elasticity, even if it directly contacts the molding material, it does not adversely affect the molding material or the molding obtained by pressure molding it. In order to obtain a molded body more reliably without breakage, it is preferable to attach a protective member having elasticity to the surface of the elastic member 6 toward the opening.
[0040]
The pressure vessel main body 2 is provided with a pressure medium supply path 8, and an opening of the pressure medium supply path 8 is one of an inner end surface forming the pressure medium accommodation space 7 and an inner peripheral surface of the recessed portion 5. Open at an appropriate position. The pressure medium supply path 8 formed in the pressure vessel body 2 is connected to the pressure medium supply means through a pipe (not shown). The pressure medium supply means includes a pump that sucks and discharges the pressure medium, a pipe that connects the pump and the pressure medium supply path 8, and an opening / closing valve that is provided as necessary.
[0041]
The insertion body 3 has a cylinder 9 and a piston 10.
[0042]
As shown in FIG. 1, the cylinder 9 includes a cylinder body 11 and a cylinder bottom body 12, and the cylinder body 11 is stacked on the cylinder bottom body 12.
[0043]
As shown in FIG. 2, the cylinder body 11 has a rectangular shape when viewed from the top surface of the cylinder 9 and an outer peripheral surface 13 that is in sliding contact with the inner peripheral surface of the recessed portion 5 when the insertion body 3 is inserted into the recessed portion 5. A substantially cylindrical body having a first internal space 14 having a horizontal cross-sectional shape is formed. The first internal space 14 is formed in a penetrating state penetrating from the end surface of the cylinder body 11 to the other end surface. Although not shown in FIG. 1, an O-ring is usually mounted on the outer peripheral surface of the cylinder main body 11 so as to go around the outer peripheral surface of the cylinder main body 11, and air in a material accommodation space described later is provided. When the air is exhausted, outside air does not leak into the material accommodating space from the gap between the inner peripheral surface of the recessed portion 5 and the outer peripheral surface of the cylinder body 11.
[0044]
The cylinder bottom body 12 is a bottomed cylindrical body having the same diameter as the cylinder body 11. When the cylinder body 11 is stacked on the cylinder bottom body 12, the cylinder bottom body 12 is flush with the outer peripheral surface 13 of the cylinder body 11. And a cylindrical second internal space 16 having a diameter larger than the length of the diagonal line of the rectangle that is the horizontal cross-sectional shape of the first internal space 14 formed in the cylinder body 11. Have
[0045]
In this embodiment, the cylinder bottom body 12 is provided with a first air lead-in / out passage 17 that opens to the inner peripheral surface thereof. The first air lead-in / out passage 17 is connected to a first air supply / discharge means (not shown). Are combined.
[0046]
Here, the first air supply / discharge means has a function of supplying air into the cylinder 9 and exhausting the air in the cylinder 9 through the first air lead-in / out path 17. For example, a pipe connected to the first air lead-in / take-in path 17, a pump for sucking and discharging air, and a valve device interposed as necessary are formed.
[0047]
The cylinder bottom body 12 is provided with a second air outlet / inlet passage 18 that opens to the bottom surface of the second internal space 16, and the second air outlet / inlet passage 18 is coupled to a second air supply / exhaust means (not shown). Yes. Air is introduced into the second internal space 16 through the second air lead-in / in passage 18 so that the air in the second internal space 16 is sucked and exhausted.
[0048]
Here, the second supply / discharge means can supply air into the second internal space 16 and exhaust the air in the second internal space 16 via the second air lead-in / take-in path 18. For example, a pipe connected to the second air lead-in / take-in path 18, a pump for sucking and discharging air, and a valve device interposed as necessary are formed.
[0049]
Further, for example, as shown in FIG. 3, when the cylinder body 11 is stacked on the cylinder bottom body 12, the space between the upper end surface of the cylinder bottom body 12 and the lower end surface of the cylinder body 11 is airtight. Further, an O-ring 19 is interposed between the upper surface of the cylinder bottom body 12 and the lower end surface of the cylinder body 11.
The piston 10 has a piston main body 20 and a flange portion 21.
[0050]
The piston main body 20 is a quadrangular prism body having an outer peripheral surface that allows the inner peripheral surface of the cylinder main body 11 to slide, and a flange portion 21 is provided at the lower end of the piston main body 20. On the outer peripheral surface of the piston main body 20, an appropriate number of grooves 22 continuous from the flange portion 21 to the vicinity of the front end surface of the piston main body 20 are provided.
[0051]
The flange portion 21 has a disk shape having substantially the same diameter as the inner diameter of the second inner space 16 of the cylinder bottom body 12. An O-ring 23 is attached to the peripheral surface of the flange portion 21 so as to make a round of the peripheral surface, and the inner peripheral wall forming the second inner space 16 in the cylinder bottom body 12 and the periphery of the flange portion 21. The gap with the surface is hermetically closed, and the flange portion 21 is prevented from moving up and down in the cylinder bottom body 12.
[0052]
When the flange portion 21 of the piston 10 is in contact with the bottom surface of the second inner space 16 of the cylinder bottom body 12, the front end surface of the piston main body 20 is positioned further below the front end surface of the cylinder main body 11. In addition, when the piston 10 moves and the flange portion 21 comes into contact with the lower end surface of the cylinder body 11, the piston 10 and the cylinder are arranged so that the front end surface of the piston body 20 at least coincides with the front end surface of the cylinder body 11. The dimensions of each part 9 are determined.
[0053]
By designing in this way, when the piston 10 is arranged in the cylinder 9 so that the flange portion 21 of the piston 10 contacts the bottom surface of the second inner space 16 of the cylinder bottom body 12, the upper end surface of the piston body 20 and A material accommodating space 24 having a rectangular horizontal cross section is formed with the inner peripheral surface of the cylinder body 11.
[0054]
The yoke 4 that is a fixing means includes a pair of vertical portions 25 that are vertically arranged, and an upper horizontal portion 26 and a lower horizontal portion 27 that are provided in parallel so as to be horizontally bridged between the upper portion and the lower portion of the vertical portion 25. The pair of vertical portions 25, the upper horizontal portion 26, and the lower horizontal portion 27 are integrated. An opening formed by the upper horizontal portion 26 and the lower horizontal portion 27 and a pair of vertical portions 25 (hereinafter, this opening portion is referred to as a working opening portion 28) is used for the pressure vessel body 2 to which the insertion body 3 is attached. It has a size necessary for accommodation. In other words, when the pressure vessel body 2 to which the insertion body 3 is mounted is accommodated in the working opening 28, the lower surface of the upper horizontal portion 26 is at a higher position with a slight clearance than the upper surface of the insertion body 3, and the lower horizontal The upper surface of the portion 27 is located on the lower surface of the pressure vessel body 2, and the distance between the pair of vertical portions 25 is designed to be sufficiently longer than the diameter of the pressure vessel body 2. The pressure vessel body 2 is supported by appropriate means such as a frame (not shown).
[0055]
The yoke 4 is configured to be horizontally movable, for example, by providing a guide that straddles and slides on a pair of horizontally arranged rails (hereinafter referred to as horizontal rails). When a molding material such as a laminated sheet is placed in the material accommodating space 24, the insertion body 3 needs to be removed from the pressure vessel body 2, so that the yoke 4 stands by at a position retracted from the pressure vessel body 2, and pressure molding is performed. When the operation is performed, the yoke 4 moves so as to accommodate the pressure vessel main body 2 to which the insertion main body 3 is attached in the working opening 28 of the yoke 4. The drive source of the yoke 4 is not particularly limited, but an air cylinder (not shown) is used in this embodiment. An electric motor may be used as a drive source for the yoke 4.
[0056]
The yoke 4 is provided with heating means. As the heating means, there is no particular limitation on the structure as long as the laminated sheet accommodated in the material accommodation space 24 can be heated during the pressurizing operation. In this embodiment, a heating means is configured by providing an electric heater (not shown) in the pair of vertical portions 25, the upper horizontal portion 26 and the lower horizontal portion 27 in the yoke 4.
[0057]
Next, the operation of the molded body manufacturing apparatus having the above configuration will be described below.
[0058]
First, as an initial state, the yoke 4 is moved to the atmosphere at a position retracted from the pressure vessel main body 2 and the insertion main body 3 by horizontally moving, for example. As shown in FIG. 5, the insertion body 3 is detached from the recessed portion 5 of the pressure vessel body 2, that is, the insertion body 3 is separated from the pressure vessel body 2. As an initial state of the insertion main body 3, the insertion main body 3 may stand by at a position where the insertion main body 3 is sufficiently separated from the lower surface of the pressure vessel main body 2 for the convenience of accommodating the molding material in the material accommodation space 24. In addition, although the height dimension between the upper surface of the insertion body 3 and the lower surface of the pressure vessel body 2 is not so large, the insertion body 3 waits at a position where it is horizontally moved from directly under the pressure vessel body 2 and retracted. May be.
[0059]
In any case, the molding material is inserted into the material accommodation space 24 in the insertion body 3.
[0060]
Here, the molding material may be a powder itself, but a ceramic green having a conductive layer on the surface as a material that can fully perform the functions of the molded body manufacturing apparatus of the present invention. A sheet and a laminate formed by pressure-bonding a plurality of the green sheets so that the green sheets are not separated can be exemplified.
[0061]
This green sheet is usually of a predetermined shape (in many cases, a square or a rectangle) obtained by forming a clay having ceramics and a binder into a predetermined thickness and then cutting it into a predetermined size. In this embodiment, it is rectangular.) A conductive layer is formed on the surface of the ceramic sheet with a conductive paint or the like.
[0062]
In addition, as a forming material as another aspect, thin sheets made of ceramics are stacked, and the sheets are bonded together by pressing lightly as necessary, or the sheets are bonded by lightly firing as necessary. Or a laminate in which the sheets are lightly bonded to each other by the binder used for forming the sheet.
[0063]
As shown in FIG. 5, when the molding material P is accommodated in the material accommodation space 24, it is preferable to place a release sheet 29 on the front end surface of the piston main body 20 in the material accommodation space 24. If the release sheet 29 is provided on the front end surface of the piston main body 20, it is possible to prevent the molded body from binding to the front end surface of the piston main body 20 and to easily separate the molded body from the front end surface of the piston main body 20. it can.
[0064]
When the green sheet or laminate is used as the molding material, they are usually very thin. Therefore, even if a predetermined number of green sheets or laminates are accommodated in the material accommodation space 24, an excess space is generated between the upper surface of the accommodated green sheets or laminates and the tip surface of the cylinder body 11. There is. In such a case, it is preferable to interpose a flexible member as a spacer in the surplus space.
[0065]
As an aspect of the arrangement of the spacer, the spacer is placed directly on the tip surface of the piston body 20, the release sheet 29 is placed on the spacer, and the molding material is further placed on the release sheet 29, A mode in which a release sheet 29 is further placed on the upper surface of the molding material so that the upper surface of the release sheet 29 disposed on the upper surface of the molding material is substantially flush with the tip surface of the cylinder body 11; 20, a release sheet 29 is placed on the front end surface, a molding material is placed on the release sheet 29, a release sheet 29 is further placed on the upper surface of the molding material, and a spacer is placed on the upper surface of the release sheet 29. Can be included so that the upper surface of the spacer and the tip surface of the cylinder body 11 are substantially flush with each other.
[0066]
As shown in FIG. 1, after the molding material is loaded in the material accommodation space 24 in this way, the insertion body 3 is inserted into the recessed portion 5 of the pressure vessel body 2.
[0067]
At the time of this insertion, the air in the material accommodating space 24 is exhausted by driving the first air supply / discharge means. In this case, as shown in FIG. 4, since there is a minute gap between the inner circumferential surface of the cylinder body 11 and the outer circumferential surface of the piston body 20, the air in the material accommodation space 24 is exhausted through this minute gap. . Further, since the groove 22 is provided on the peripheral surface of the piston main body 20, the passage resistance of the air passing through the gap is small, and the inside of the material accommodation space 24 can be decompressed quickly.
[0068]
When the inside of the material accommodating space 24 is depressurized, the insertion body 3 is pressed into the atmospheric pressure and quickly loaded into the recessed portion 5. In a state where the insertion body 3 is completely loaded in the recessed portion 5, the uppermost member accommodated in the material accommodation space 24, for example, the spacer or the release sheet 29 is in contact with the elastic member 6. When a protective member is provided on the surface of the elastic member 6 on the side of the insertion body 3, the uppermost member accommodated in the material accommodating space 24, for example, the spacer or the release sheet 29 is in contact with the protective member. ing.
[0069]
The driving of the first air supply / discharge unit is continued, and the inside of the material accommodation space 24 is kept in a reduced pressure state.
[0070]
Next, the yoke 4 is moved so that the upper horizontal portion 26 of the yoke 4 is positioned on the upper surface of the pressure vessel main body 2, and at the same time, the lower horizontal portion 27 of the yoke 4 is moved to the lower surface of the insertion main body 3. Located on the lower surface of the body 12.
[0071]
In this state, the pressure medium is pressed into the pressure medium accommodation space 7. The pressurizing force of the pressure medium is applied to the molding material in the material accommodating space 24 by the press-fitting of the pressure medium. At the same time, the pressure applied by the pressure medium is applied to the cylinder 9 and the piston 10 in such a direction as to push the cylinder 9 and the piston 10 out of the recessed portion 5. A lower horizontal portion 27 of the yoke 4 is disposed on the lower surface of the yoke 4, and the lower horizontal portion 27 fixes the insertion body 3 so that the cylinder bottom body 12 cannot move. At the same time, the pressure applied by the pressure medium is applied to the pressure vessel main body 2 in the direction in which the pressure vessel main body 2 moves upward. The upper surface of the pressure vessel main body 2 is moved by the upper horizontal portion 26 of the yoke 4. It is fixed impossible. Therefore, the pressure applied by the pressure medium is concentrated on the molding material, and the molding material is pressure-molded.
[0072]
Further, if the inside of the material accommodating space 24 is heated by the heating means provided in the yoke 4, the heat and pressure molding is performed by the pressurizing force by the pressure medium and the heating by the heating means.
[0073]
Since the air in the material accommodating space 24 is continuously exhausted by the first air supply / exhaust means during the pressure molding or the heat pressure molding, the gas existing in the molding material or the heating material is heated. The decomposition gas generated by the decomposition of the components is discharged from the material accommodation space 24. As a result, it is possible to effectively prevent the generation of voids in the molded body, which would be generated when the gas remaining in the molding material or the decomposition gas generated by heating remains.
[0074]
After the pressurization of the molding material in the material accommodation space 24 by the pressurization of the pressure medium is continued for a predetermined time, the pressurization of the pressure medium is stopped and the pressure medium in the pressure medium accommodation space 7 is removed.
[0075]
The yoke 4 is retracted to the initial position.
[0076]
The insertion body 3 is removed from the recessed portion 5 of the pressure vessel body 2. In this case, the first air supply / discharge means is driven to press-fit air into the material accommodation space 24 to bring the inside of the material accommodation space 24 to a pressure higher than atmospheric pressure. When air is press-fitted into the material accommodating space 24, when the first arc supply means is driven to depressurize the material accommodating space 24, the powder of the molding material is separated from the inner peripheral surface of the cylinder body 11 and the piston body 20. Although it may have fallen into the gap with the outer peripheral surface, when the first air supply / exhaust means is driven and air is pressed into the material accommodation space 24, the powder that has fallen into the gap becomes the material accommodation space 24. Blown to the side. Therefore, the sliding obstruction of the piston 10 due to the powder entering the gap between the inner peripheral surface of the cylinder main body 11 and the outer peripheral surface of the piston main body 20 is prevented.
[0077]
Further, when the first air supply / discharge means is driven to bring the inside of the material accommodating space 24 to a pressure equal to or higher than the atmospheric pressure, the insertion body 3 is quickly pushed out from the recessed portion 5.
[0078]
After the insertion main body 3 is pushed out from the recessed portion 5 and the pressure vessel main body 2 and the insertion main body 3 are separated, the second air supply / discharge means is driven and the piston 10 is connected to the piston 10 via the second air lead-in / out passage 18. Air is pressed between the bottom surface of the flange portion 21 and the top surface of the cylinder bottom body 12. Since an O-ring is interposed on the peripheral surface of the flange portion 21, an airtight space is formed by the bottom surface of the flange portion 21, the upper surface of the cylinder bottom body 12, and the inner peripheral surface of the cylinder bottom body 12. Yes. Therefore, as shown in FIG. 6, by press-fitting air into this airtight space, the piston main body 20 rises, and the molded body formed in the material accommodating space 24 is moved by the tip surface of the piston main body 20. It is pushed out from the material accommodating space 24.
[0079]
At this time, even if the edge piece portion of the molded body is firmly bonded to the inner peripheral surface of the cylinder main body 11, the edge portion at the tip end surface of the piston main body 20 is connected to the inner peripheral surface of the cylinder main body 11. Since it slides, the molded body is pushed out of the material accommodating space 24 without damaging the edge of the molded body.
[0080]
The molded body is pressure-molded as described above, and the molded body obtained by pressure molding can be taken out from the material accommodating space 24 without damage to the edge portion.
[0081]
In the above embodiment, the bottom surface of the cylinder bottom body 12 is the piston restricting means.
[0082]
In the present invention, the piston restricting means has a function of preventing the piston 10 from retreating when the pressure of the pressure medium is applied to the piston 10 when the pressure medium is pressurized. Therefore, in this invention, as long as it has the said function, various piston control means can be devised as a design change matter of those skilled in the art.
[0083]
In the above embodiment, the piston drive means can move the piston up and down by an airtight space formed by the flange portion and the bottom surface of the cylinder bottom body and air that is press-fitted into the airtight space or forcedly exhausted. Although it is formed, the mechanism is not limited to the mechanism shown in the embodiment as long as it has a function of moving the piston up and down.
[0084]
【The invention's effect】
According to the present invention, it is possible to provide a molded body manufacturing apparatus capable of manufacturing a molded body with high yield without damaging the edge of the molded body.
[0085]
According to the present invention, the insert body can be quickly loaded into the recessed portion of the pressure vessel body, and a molded body manufacturing apparatus with good operability can be provided.
[0086]
According to this invention, it is possible to provide a molded body manufacturing apparatus capable of firing and pressure-molding powder.
[0087]
According to the present invention, the insertion body can be quickly loaded into the recessed portion of the pressure vessel body, pressure molding and heat pressure molding can be performed, and the molded body is not damaged at the edge. It is possible to provide a molded body manufacturing apparatus that can be easily taken out and can manufacture a molded body with high yield.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a molded body manufacturing apparatus according to an embodiment of the present invention, in which an insertion body is mounted in a recessed portion of a pressure vessel body, and a yoke regulates the upper surface of the pressure vessel body. And the state which is regulating the bottom face of an insertion main body is shown.
FIG. 2 is a top view showing an upper surface of a cylinder body in a molded body manufacturing apparatus according to an embodiment of the present invention.
FIG. 3 is an explanatory cross-sectional view showing the structure of an insertion body in a molded body manufacturing apparatus according to an embodiment of the present invention.
4 is a cross-sectional view showing a slight clearance between the inner peripheral surface of the cylinder main body and the outer peripheral surface of the piston main body in the molded body manufacturing apparatus according to an embodiment of the present invention; FIG. It is sectional explanatory drawing which expanded and showed the part shown with the circle of the broken line in.
FIG. 5 is an explanatory cross-sectional view showing a state where a pressure vessel main body and an insertion main body are separated in a molded body manufacturing apparatus according to an embodiment of the present invention.
FIG. 6 is an explanatory cross-sectional view showing a state in which a molded body is pushed out by a piston from a material accommodation space in a cylinder body in a molded body manufacturing apparatus according to an embodiment of the present invention.
[Brief description of symbols]
DESCRIPTION OF SYMBOLS 1 ... Molded object manufacturing apparatus, 2 ... Pressure vessel main body, 3 ... Insertion main body, 4 ... Yoke, 5 ... Recessed part, 6 ... Elastic member, 7 ... Pressure medium Housing space, 8 ... Pressure medium supply path, 9 ... Cylinder, 10 ... Piston, 11 ... Cylinder body, 12 ... Cylinder bottom, 13 ... Outer peripheral surface, 14 ... 1st internal space, 15 ... Outer peripheral surface, 16 ... 2nd internal space, 17 ... 1st air derivation | intake path, 18 ... 2nd air derivation | intake path, 19 ... O-ring, 20 ... piston main body, 21 ... flange, 22 ... groove, 23 ... O-ring, 24 ... material accommodating space, 25 ... vertical part, 26 ... upper horizontal part, 27 ... Lower horizontal part, 28 ... Working opening.

Claims (3)

(1) (a) A cylinder formed by a cylinder body having a penetrating internal space and a bottomed cylinder bottom body having an internal space larger than the internal space of the cylinder body, and being inserted into the cylinder that comprises a piston, to form a (b) the pressure圧素material accommodation space between the inner circumferential surface and the front end face of the piston of the cylinder by inserting the piston into the cylinder,
(c) provided with piston drive means for causing the piston to advance in the internal space of the cylinder body by press-fitting air into the internal space of the cylinder bottom body; and
(d) an insertion body comprising piston restricting means for preventing the piston from being pushed out of the cylinder when pressurizing the pressurized material accommodating space;
(2) A recessed portion having an inner end surface facing an opening that allows the insertion main body to be inserted, and a molding material accommodated in the pressurized material accommodating space when the insertion main body is inserted into the recessed portion. A pressure medium is press-fitted into a pressure medium accommodating space formed by a liquid-tight elastic member, an elastic member, an inner peripheral surface of the concave portion, and the inner end surface at a position in the concave portion that directly contacts the concave portion. And pressurizing means pressure vessel body for pressurizing the molding material accommodated in the pressurized material accommodating space through the elastic member by press-fitting a pressure medium,
(3) A molded body manufacturing apparatus , comprising: a pressure vessel main body and a fixing means including a regulating member for fixing the insertion main body inserted into the recessed portion during pressure molding. 2. The molded body according to claim 1, wherein the cylinder includes air lead-in / out means for exhausting air in the pressurized material accommodation space and introducing air into the pressurized material accommodation space. manufacturing device. The molded body manufacturing apparatus according to claim 1 or 2, further comprising a material heating means for heating the inside of the pressurized material accommodation space.

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