JP2004299089A - Suction jig and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To hold a fragile extremely thin-walled sheet material to feed the same in an injection molding machine. <P>SOLUTION: A suction jig 10 is constituted so as to suck a part W to be sucked such as a molded product, an insert part or the like to feed the same in the injection molding machine and has a suction pad 12 forming a suction surface 12a to which the part W to be sucked is sucked. This suction pad 12 is constituted of a porous metal body having air permeability. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a suction jig that has a suction pad and conveys a component to be sucked, and a method of manufacturing a suction pad in a resin injection molding machine.
[0002]
[Prior art]
Conventionally, a metal insert part such as a terminal is placed in a cavity formed by a mold, and then the cavity is filled and cured with a molten resin, so that the insert part is cast with the resin and integrally formed. Insert molding for molding complex composite parts has been performed. This type of insert molding is used to combine the performance of different types of materials and provide a composite function, as well as to consolidate parts, shorten the process, streamline the assembly of the next process, obtain stable parts accuracy, and function reliability. (For example, see Patent Document 1).
[0003]
When performing such insert molding, the insert component is held by a robot provided with a transfer jig such as a clamp or a suction jig according to the shape and material of the insert component, and placed in a mold. Also, such a robot may be used for taking out a molded product.
[0004]
[Patent Document 1]
JP 08-207077 A
[0005]
[Problems to be solved by the invention]
In the meantime, in the insert molding, in which a combination of different kinds of materials has been generally used in the past, in recent years, a technique has been proposed in which, for example, a film on which a pattern is printed is molded as an insert part, thereby eliminating a coating step in a resin molded product. . In response to such diversification of insert parts, production of a resin molded product having an extremely thin portion by, for example, inserting a very thin plate material is being studied.
[0006]
However, it is difficult to hold an ultra-thin plate using a conventional holder such as a clamp. Further, when a very thin large plate material is sucked by the suction jig, there is a possibility that bending or breakage may occur.
[0007]
That is, a suction jig having an internal space formed, for example, in a dome shape or a bowl shape from rubber such as silicon or urethane, which is conventionally used, directly contacts and supports the sucked component to be sucked. What is done is only the edge of the opening of the suction jig. Therefore, the sucked component drawn into the internal space of the suction jig which has been under negative pressure bends inside the edge. In this case, the only way to prevent the component to be sucked from bending is to keep the opening small or reduce the suction force of the exhaust device. Therefore, with the conventional suction jig, it has been difficult to achieve both stable suction holding and prevention of bending of the sucked component.
[0008]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to hold and transport a fragile ultra-thin plate without damaging it in an injection molding machine.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention is a suction jig for suctioning and transporting a suctioned component such as a molded product or an insert component in an injection molding machine, wherein the suctioned component is sucked. It is characterized in that it has a suction pad which forms a suction surface, and this suction pad is made of a porous metal body having air permeability.
[0010]
According to the present invention, since the suction surface for sucking the molded product or the insert component has a sufficient area, even if the component to be sucked is a thin plate-shaped body, it can be suction-held without bending.
[0011]
The suction pad is attached to the jig body so as to close the opening of the jig body having the internal space. Thus, a large suction surface can be provided, and the component to be sucked can be stably held without causing bending or the like.
[0012]
Further, the suction pad includes a dense layer provided as a suction surface and having fine pores, and a highly permeable layer provided on the back surface of the dense layer and having pores larger than the fine pores of the dense layer.
That is, the dense layer that forms the adsorption surface has high strength and abrasion resistance and excellent durability because the fine particles are densely arranged, and does not easily damage the surface even when in contact with a molded product or insert part. On the other hand, a highly permeable layer having larger pores has a higher permeable property, so that the suction pad can sufficiently secure the permeable property.
[0013]
Furthermore, since the dense layer is supported by the highly permeable layer, the thickness of the dense layer can be reduced. That is, since the thickness of the dense layer having low air permeability can be reduced, sufficient air permeability can be secured, and pressure loss of intake air can be reduced.
[0014]
Depending on the application, the porosity of the suction pad is set higher when strong suction force is required, and set lower when it is not desired to have a bad effect such as deformation on the sucked part such as a thin plate material. It is set appropriately.
If the porosity is too low, that is, less than 20% by volume in the dense layer and less than 40% by volume in the highly permeable layer, the air permeability is partially insufficient and sufficient suction force is secured. May not be possible.
[0015]
On the other hand, when the porosity is too high, that is, when the porosity exceeds 60% by volume in the dense layer, and when the porosity exceeds 90% by volume in the highly permeable layer, the skeleton portion constituting the three-dimensional network structure is reduced. There is a possibility that the strength may not be able to be secured because the amount is too small. In particular, if the porosity of the dense layer serving as the suction surface is too high, the component to be sucked may be deformed.
Therefore, the porosity of the dense layer is set in the range of 20 to 60% by volume, more preferably 40 to 49% by volume, and the porosity of the highly permeable layer is 40 to 90% by volume, more preferably 60 to 80% by volume. Is set within the range.
[0016]
Also, the average pore diameter of the suction pad, like the porosity described above, is large when a strong suction force is required, and small when it is not desired to adversely affect the suction target component such as a thin plate material such as deformation. It is set as appropriate depending on the application, such as setting.
If the average pore diameter is too small, that is, less than 1 μm in the dense layer, and less than 30 μm in the highly permeable layer, it becomes partially difficult to secure air permeability, and sufficient air permeability cannot be secured. Particularly in a dense layer, there is a possibility that clogging is likely to occur due to dust or the like.
[0017]
On the other hand, when the average pore diameter is too large, that is, when the average pore diameter exceeds 30 μm in the dense layer, the wear resistance is reduced, and a component to be adsorbed such as an extremely thin plate material may have an adverse effect such as deformation. Occurs. Further, when the average pore diameter exceeds 500 μm in the highly permeable layer, the skeleton portion constituting the three-dimensional network structure becomes too small, and the strength may not be secured.
[0018]
Therefore, the average pore diameter of the dense layer is set in the range of 1 to 30 μm, more preferably 2 to 20 μm, and the average pore diameter of the highly permeable layer is set in the range of 30 to 500 μm, more preferably 50 to 300 μm. You.
[0019]
Furthermore, the thickness of the suction pad is appropriately set according to the application, such as thin when a strong suction force is required, and thick when strength and durability are required.
If the thickness is too large, that is, 500 μm in the dense layer and 1000 μm in the high air permeability layer, the distance of air passage during adsorption becomes longer and the pressure loss of the intake air increases.
On the other hand, if the thickness is too small, that is, if it is less than 50 μm in the dense layer and less than 300 μm in the highly permeable layer, it is difficult to secure the strength.
Therefore, the thickness of the dense layer is set in the range of 50 μm or more and 500 μm or less, more preferably 200 μm or less, and the thickness of the highly permeable layer is set in the range of 300 μm or more and 1000 μm or less, more preferably 800 μm or less.
[0020]
The suction jig includes a slurry layer forming step of forming a slurry layer by spreading a slurry containing metal powder on a carrier sheet by a doctor blade method; a drying step of drying the slurry layer to form a green sheet; Is manufactured by performing a firing step of degreasing and sintering to obtain a fired body, and a forming step of processing and shaping the fired body or green sheet to give a shape as a suction pad.
[0021]
According to this manufacturing method, the conditions such as the pore diameter and porosity of the porous metal body can be easily set to desired values by appropriately adjusting the manufacturing conditions. Can be manufactured.
[0022]
Further, the method includes a slurry layer laminating step of, after the slurry layer forming step, laminating a slurry composed of a component different from the slurry onto the slurry layer by a doctor blade method to laminate a slurry layer. By performing the lamination step one or more times, it is possible to manufacture an adsorption pad in which two or more layers of porous metal bodies having different properties (average pore diameter, porosity, material, etc.) are laminated.
[0023]
Further, as a method of manufacturing a suction jig having a suction pad having a dense layer and a highly air-permeable layer, a slurry layer forming step of forming a slurry layer by spreading a slurry containing metal powder on a carrier sheet by a doctor blade method, A slurry layer laminating step of performing a step of laminating a slurry layer by extending a slurry composed of a component different from the slurry onto the slurry layer by a doctor blade method at least once, and a slurry layer composed of each of the slurries having different components Among them, a foaming step of foaming a foaming agent contained in the slurry layer forming the high-permeability layer to form a foamed green sheet, a drying step of drying the foamed green sheet to form a green sheet, and degreasing the green sheet. A sintering process of sintering into a fired body, and processing and shaping of a fired body or green sheet for adsorption Method of performing a molding step of imparting the shape of the head is employed.
[0024]
According to this manufacturing method, it is possible to obtain an adsorption pad in which a dense layer made of a slurry containing no foaming agent and a high-ventilation layer made of a slurry containing the foaming agent are integrally formed.
[0025]
In addition, as a raw material for forming the suction pad, a cobalt-based alloy or a nickel alloy having high wear resistance is used in order to prevent a short life due to wear and to prevent a wear component of the suction pad from adhering to a component to be sucked. Hard materials such as cemented carbide and cermet are preferred.
Examples of the alloy for the suction pad of the present invention include Stellite (registered trademark), which is a Co-Cr-W-based cobalt-based alloy, and a Ni-Cr-B-based nickel-based alloy.
Examples of the cemented carbide for a suction pad according to the present invention include an alloy in which a hard phase mainly composed of tungsten carbide (WC) is bonded with a metal such as cobalt (Co) and nickel (Ni). Titanium carbide (TiC), titanium carbonitride (TiCN), tantalum carbide (TaC), niobium carbide (NbC), chromium carbide (Cr ₃ O ₂ ), Chromium (Cr) and the like are conventionally known. Further, as an example of the cermet for the suction pad of the present invention, TiC or TiCN is mainly used, and WC, TaC, NbC, Mo is used as necessary. ₂ A conventionally known one in which a hard phase containing C or the like is bonded with a metal such as Ni or Co can be used.
Further, in the case of receiving an impact at the time of suction, the amount of the metal bonding phase is increased to increase the toughness, and in the case where corrosion resistance becomes a problem, it is preferable to use a Ni or Ni—Cr based bonding phase.
[0026]
Here, in order to use the suction pad of the present invention as a suction jig, the obtained porous metal body is bonded to a base having ventilation holes using an adhesive or a brazing material. When the surface to be sucked of the component to be sucked is a curved surface, the porous metal body may be polished to form a curved surface, or one surface of the porous molded body may be formed into a shape corresponding thereto and sintered. You may. Furthermore, if the component to be sucked is damaged, the surface of the suction surface may be coated.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, a suction jig 10 has a jig main body 11 having an opening 11a on one surface, and a sheet-like air-permeable sheet attached to the jig main body 11 so as to cover the entire opening 11a. And a suction pad 12.
[0028]
The jig main body 11 has a shape having an internal space R such as a dome shape or a cone shape made of rubber or metal such as silicon or urethane having no air permeability. Not connected to the exhaust system. By operating this exhaust device, outside air is sucked into the jig main body 11 through the suction pad 12, and the suction target component W is sucked on the suction surface 12 a of the suction pad 12.
[0029]
As shown in FIG. 2, the suction pad 12 includes a pad body 13 in the form of a porous sheet that forms a suction surface 12a, a resin layer 14 provided so as to surround the periphery of the pad body 13, a resin layer 14, and a pad body. 13 and a plate-shaped base 15 for receiving the back surface 13b.
[0030]
As shown in FIG. 3, the pad body 13 is formed of a porous metal body formed by sintering fine particles. The pad body 13 is provided on the suction surface 12a (surface 13a) side, and the pad body 13 A dense layer 16 having a thickness D1 in which pores of communicating three-dimensional network structure are formed and a solid skeleton formed by sintering fine particles form a three-dimensional network structure in which pores communicating with each other are formed. And a highly permeable layer 17 having a thickness D2 provided on the back surface of the layer 16. The pores communicate from the surface 13a forming the suction surface 12a to the back surface 13b received on the base 15.
[0031]
As a raw material powder used for manufacturing the pad body 13, a powder of an arbitrary material can be used according to properties required for the suction pad 12. For example, since the dense layer 16 forming the adsorption surface 12a is required to have wear resistance, it is preferable to use powder of a material having high wear resistance such as cemented carbide powder or cermet powder.
[0032]
The pad body 13 is attached to the base 15 by bonding with an adhesive or brazing. For example, the pad body 13 and the base 15 are diffusion-bonded by applying nickel phosphorus plating to their respective contact surfaces and heating them with their plated surfaces in contact with each other.
[0033]
The base 15 has a rigidity that is not deformed by the negative pressure in the jig main body 11 or the abutment of the component W to be sucked, and is configured to have air permeability in the thickness direction at least in a region for receiving the pad main body 13. . In the present embodiment, the base 15 is an aluminum plate having a plurality of ventilation holes 15a penetrating in the thickness direction.
Here, the ventilation hole 15a is, for example, a through hole having an inner diameter of 100 μm to 1000 μm, and in the present embodiment, 9 round holes having an inner diameter of 500 μm / cm are provided. ² Has formed.
[0034]
The resin layer 14 is made of a resin, such as ABS, silicon, urethane, or the like, having a higher degree than the component to be sucked, so as not to damage the component W to be sucked to the suction surface 12a. The thickness is the same as the pad body 13. The surface 14a is flush with the surface 13a of the pad body 13 so that the component W to be sucked can be efficiently sucked.
[0035]
In the suction jig 10 described above, the jig main body 11 and the base 15 of the suction pad 12 are manufactured by processing a metal material, or molding or machining a synthetic resin, respectively. The resin layer 14 of the suction pad 12 is manufactured by molding or machining a synthetic resin. For the base 15, the resin layer 14 is formed directly on the base 15 by molding, or It is provided by fixing a resin layer 14 previously formed into a desired shape using an adhesive or the like.
[0036]
Next, an example of a method of manufacturing the pad body 13 will be described with reference to FIG. The pad body 13 according to the present embodiment is manufactured by manufacturing a green sheet using the green sheet manufacturing apparatus 21 and firing the green sheet.
[0037]
First, a green sheet manufacturing apparatus 21 for manufacturing a green sheet uses a carrier sheet 22 as a base for forming a green sheet, and includes an unwinding reel 23 around which the carrier sheet 22 is wound, and a winding reel 23. A take-up reel 24 for taking up the carrier sheet 22 from the take-out reel 23, and at least a section of the carrier sheet 22 drawn from the take-out reel 23 between the take-up reel 23 and the take-up reel 24 is held in a horizontal state. And a section of the carrier sheet 22 that is held by the support roll 25 is a sheet formation section that is used for forming a green sheet.
[0038]
In the sheet forming section, a first hopper 26 that continuously supplies a first slurry as a raw material of the dense layer 16 of the pad body 13 onto the carrier sheet 22 is provided, and a first hopper 26 is provided downstream of the first hopper 26. A first doctor blade 27 for forming the first slurry moving downstream together with the carrier sheet 22 supplied onto the carrier sheet 22 from the first hopper 26 into a first slurry layer L1 having a desired thickness is provided. ing.
[0039]
Here, as the first slurry, a mixture of a raw material powder and a binder, or a mixture obtained by adding a surfactant to this mixture as needed is used.
In this embodiment, the first slurry contains 30 to 80% by weight of the raw material powder, 0.5 to 20% by weight of methylcellulose as a binder, and 0.1 to 15% by weight of glycerin, and the rest is water. Here, when a surfactant is added to the first slurry, sodium dodecylbenzenesulfonate is used as the surfactant.
[0040]
Further, in the sheet forming section, the second slurry serving as the raw material of the highly permeable layer 17 of the pad body 13 is continuously supplied to the first slurry layer L1 on the carrier sheet 22 downstream of the first doctor blade 27. A second hopper 28 is provided. On the downstream side of the second hopper 28, the second slurry supplied onto the first slurry layer L1 from the second hopper 28 and moving downstream together with the carrier sheet 22 is provided with a second slurry layer having a desired thickness. A second doctor blade 29 for forming into L2 is provided.
[0041]
Here, as the second slurry, a slurry composed of a mixture of a raw material powder, a binder, a surfactant, and a foaming agent is used.
In the present embodiment, the second slurry is Stellite (registered trademark) No. 6 (average particle size: 10 μm), 30 to 80% by weight, 6.5 to 20% by weight of methylcellulose as a binder, 0.1 to 15% by weight of glycerin, and 0.1% of sodium dodecylbenzenesulfonate as a surfactant. It contains 0.5 to 5% by weight, 0.5 to 10% by weight of hexane as a foaming agent, and the remainder is water.
[0042]
On the downstream side of the second doctor blade 29 in the sheet forming section, a constant temperature / high humidity tank 31 for heating the first and second slurry layers L1 and L2 moving downstream together with the carrier sheet 22 in a high humidity atmosphere. Is provided. On the downstream side of the constant temperature / high humidity tank 31, a drying tank 32 for drying the composite slurry layer L including the first and second slurry layers L <b> 1 and L <b> 2 moving downstream together with the carrier sheet 22 to form a composite green sheet S Is provided.
[0043]
That is, the green sheet manufacturing apparatus 21 winds the carrier sheet 22 from the unwind reel 23 by the take-up reel 24 and moves the carrier sheet 22 in the sheet forming section, so that the first and second slurry The layers L1 and L2 are continuously formed to form a green sheet.
[0044]
A specific description will be given of the production of the green sheet. First, as the carrier sheet 22 moves, the first slurry is continuously supplied from the first hopper 26 onto the carrier sheet 22, and the first slurry is supplied to the first slurry. Is formed into a first slurry layer L1 having a desired thickness by the doctor blade 27 (first slurry layer forming step). In the present embodiment, the thickness of the first slurry layer L1 is 200 μm.
[0045]
Then, in the sheet forming section, the second slurry is continuously supplied from the second hopper 28 onto the first slurry layer L1 that moves downstream with the carrier sheet 22 downstream of the first doctor blade 27. Thus, the second slurry is formed into a second slurry layer L2 having a desired thickness by the second doctor blade 29 (second slurry layer forming step). In the present embodiment, the thickness of the second slurry layer L2 is 100 μm.
[0046]
(Blowing process)
The composite slurry layer L composed of the first and second slurry layers L1 and L2 thus stacked on the carrier sheet 22 is carried into the constant temperature / high humidity chamber 31 with the movement of the carrier sheet 22, Heat treatment is performed in a high humidity atmosphere.
In the present embodiment, in this foaming step, heat treatment is performed for 20 minutes in an atmosphere at a humidity of 90% and a temperature of 40 ° C.
By this heat treatment, the foaming agent contained in the second slurry layer L2 is vaporized, whereby the second slurry layer L2 foams to form a sponge-like foamed green sheet.
Here, since this heat treatment is performed in a high humidity atmosphere, the binder (methyl cellulose) contained in the first and second slurry layers L1 and L2 is not volatilized and the first and second slurry layers L1 and L2 are not evaporated. Stay within. Therefore, the second slurry layer L2 is foamed in a state where it can be easily plastically deformed, and becomes sponge-like without causing cracks or the like.
[0047]
(Drying step)
The foamed green sheet (composite slurry layer) L in which the second slurry layer L2 has been foamed in this way is carried into the drying tank 32 with the movement of the carrier sheet 22, and the moisture contained in each layer is blown away. Thus, a composite green sheet S is obtained.
In this drying step, a heat treatment is performed in air at a temperature of 80 ° C. for 15 minutes.
[0048]
(Firing step)
The composite green sheet S is taken out from the green sheet manufacturing apparatus 21 and sent to a degreasing device (not shown), whereby the binder (glue component) contained in the composite green sheet S is blown off (degreasing step).
In this degreasing step, a heat treatment is performed in air at a temperature of 500 ° C. for 15 minutes.
Next, the composite green sheet S that has been subjected to the degreasing step is sent to a sintering furnace and sintered, and then cut into a desired shape, or cut into a desired shape and then sent to a sintering furnace and sintered. (Sintering step).
As a sintering furnace, for example, a vacuum furnace is used. When a material that may be oxidized by sintering in a vacuum furnace is used as a raw material powder, for example, 5% hydrogen gas gas is reduced under a reducing atmosphere. The sintering is performed in a nitrogen gas atmosphere.
In the present embodiment, Stellite (registered trademark) No. 6, and heat treatment is performed at 1200 ° C. for 100 minutes in a vacuum atmosphere.
[0049]
In the composite fired body obtained by degreasing and sintering (firing step) the composite green sheet S, the portion constituted by the first slurry layer L1 becomes the dense layer 16 and the portion constituted by the second slurry layer L2 becomes It becomes the highly permeable layer 17.
At this time, the porosity of the portion constituted by the first slurry layer L1 in the composite fired body is in the range of 40 to 50%, and the porosity of the portion constituted by the second slurry layer L2 is 90 to 98%. Is within the range.
[0050]
(Rolling process)
The composite fired body thus obtained is further subjected to a rolling treatment to obtain a desired thickness, if necessary, and by compressing the composite fired body to a desired porosity, The pad body 13 having the dense layer 16 and the highly permeable layer 17 is obtained. In the present embodiment, the portion forming the edge of the pad body 13 in the composite fired body is further compressed than the other portions and is formed thinner than the other portions.
Here, even if the composite fired body is rolled, not only the dense layer 16 constituted by the first slurry layer L1 but also the highly permeable layer 17 constituted by the second slurry layer L2 are merely compressed in the thickness direction. As a result, the skeleton becomes a buckled structure, and the pores are not closed and continuous internal pores are maintained.
[0051]
Here, if the composite fired body is made too thin by this rolling, the porosity of the highly permeable layer 17 will be too low. Therefore, the thickness of the composite fired body (pad body 13) after rolling should be 150 μm or more. desirable.
Further, the pad body 13 obtained by rolling the composite fired body in this manner can be formed in a very thin plate shape, and furthermore, since the pad body 13 is sufficiently compressed in advance, Even when the pad body 13 receives some external force, it is unlikely to be plastically deformed.
Further, by integrally manufacturing the dense layer 16 and the high-ventilation layer 17 constituting the pad main body 13 in this manner, the adhesion strength thereof can be increased and the durability can be improved.
[0052]
Like the conventional suction jig, the suction jig 10 having the pad body 13 described above sucks the outside air through the suction pad 12 by the exhaust device, and thereby the suction target 12 W on the suction surface 12 a of the suction pad 12. Adsorbs.
In the suction pad 12, since the high air-permeable layer 17 has a high strength because of having a solid skeleton, sufficient porosity can be secured by setting the porosity high.
[0053]
Further, since the dense layer 16 is supported by the high-ventilation layer 17 having high strength, the thickness can be reduced. Then, by sufficiently reducing the thickness of the dense layer 16, the distance through which air passes in the dense layer 16 can be reduced, and the pressure loss of intake air through the dense layer 16 can be reduced. Also, sufficient air permeability can be secured.
[0054]
In addition, since the high-ventilation layer 17 has good air permeability in a direction intersecting the thickness direction, outside air that has entered the region of the high-ventilation layer 17 that is not opposed to the vent 15a of the base 15 is It is possible to quickly move to a position facing 15a. For this reason, in the suction pad 12, all the gas that has passed through the area forming the suction surface 12 a in the dense layer 16 can be quickly flowed into the ventilation hole 15 a of the base 15, and the exhaust efficiency is high.
[0055]
Thus, since the suction pad 12 has sufficient air permeability and high exhaust efficiency, the suction jig 10 using the suction pad 12 can obtain a high suction force.
[0056]
Furthermore, since the suction surface 12a of the suction pad 12 is formed by the dense layer 16, the suction pad 12 has high strength, high wear resistance, excellent durability, and a long life.
In addition, the dense layer 16 serving as the adsorption surface 12a is bent or damaged even when adsorbing a very thin and large-area plate material because the fine particles are densely arranged. I can't.
Further, since the dense layer 16 can have a sufficiently small thickness, even if dust is sucked into the dense layer 16 from the adsorption surface 12a, the dust quickly passes through the dense layer 16 and has a higher porosity. The suction pad 12 is hardly clogged with dust because the suction pad 12 is sucked into the jig main body through the high-permeability layer 17.
[0057]
Here, in order to stably transport the suction target component W, it is desirable to increase the area of the opening 11a of the jig main body 11 and increase the area of the suction target surface of the suction target component W as much as possible. In addition, it is desirable to increase the suction force of the exhaust device in order to increase the area of the surface to be sucked and not to reduce the suction force per unit area. In the suction jig 10 of the present embodiment, the suction target component W is supported by the suction pad 12 and is suction-held. Therefore, even if the area of the opening 11a of the jig main body 11 is increased or the suction force by the exhaust device is increased, the to-be-adsorbed component W is drawn into the internal space R of the jig main body 11 and bent. It is not absorbed and is stably held.
[0058]
In the above-described embodiment, an example in which the dense layer 16 and the highly permeable layer 17 are integrally manufactured has been described. However, the present invention is not limited thereto. The pad body may be manufactured by attaching or bonding by diffusion bonding.
When the dense layer 16 is manufactured as a single layer, the second hopper 28, the second doctor blade 29, and the constant temperature / high humidity chamber 31 are eliminated in the green sheet manufacturing apparatus 21, and the first hopper 26 and the Only the first slurry layer L1 is formed by the first doctor blade 27, and a drying process is performed on the first slurry layer L1 to form a green sheet. Then, the green sheet is degreased, sintered, and further rolled as necessary, whereby a single dense layer 16 can be obtained.
Further, in order to manufacture the highly permeable layer 17 into a single layer, a second sheet is used by using a green sheet manufacturing apparatus having a configuration in which the first hopper 26 and the first doctor blade 27 are eliminated in the green sheet manufacturing apparatus 21. Only the second slurry layer L2 is formed by the hopper 28 and the second doctor blade 29, and the second slurry layer L2 is subjected to a foaming step and a drying step to form a green sheet. Then, the green sheet is degreased, sintered, and rolled to obtain a single layer of the highly permeable layer 17.
[0059]
In the above-described embodiment, the pad body 13 has a double structure in which the dense layer 16 and the highly permeable layer 17 are laminated one by one. However, the present invention is not limited to this. On the other hand, a configuration in which a plurality of high ventilation layers 17 are stacked may be employed.
In this case, for example, a layer having a smaller porosity or an average porosity closer to the dense layer 16 among these high permeable layers 17 is provided (however, it is assumed that the porosity is higher than that of the dense layer 16). As a configuration in which a material having a high porosity is arranged as the distance from the dense layer 16 increases, the gas that has passed through the dense layer 16 can smoothly pass through the highly permeable layer 17 as the gas moves away from the dense layer 16.
[0060]
Here, when the pad body 13 has a configuration having a plurality of high air permeability layers 17, the dense layer 16 and each high air permeability layer 17 are separately formed, and then bonded by brazing or diffusion bonding. Alternatively, by degreasing, sintering, rolling, etc. after laminating the green sheets constituting each layer, the integrated pad body 13 can be obtained.
Further, a multi-layer pad body may be obtained by attaching a required number of high-permeability layers to the one in which one dense layer 16 and one high-ventilation layer 17 are integrally formed. After further laminating a green sheet to be a highly permeable layer on the sheet S, degreasing, sintering and rolling may be performed to obtain an integral pad body.
[0061]
By providing such a suction jig 10 as a transfer jig, for example, when taking out a very thin plate-like molded product from a molding machine, or when placing a very thin plate-like insert part in a cavity, an extremely thin plate An injection molding machine capable of transporting the shaped member without being bent or damaged, and capable of manufacturing various molding methods and molded products is realized.
[0062]
【The invention's effect】
As described above, according to the suction jig of the present invention, the porosity and the size of the pores can be easily set to desired values by appropriately adjusting the manufacturing conditions of the suction pad. Injection molding machines that can optimize the conditions for transporting the parts to be sucked, hold the parts to be sucked without bending even if the parts to be sucked are thin, and can perform various moldings. Can be realized.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an outline of a suction jig according to an embodiment of the present invention.
FIG. 2 is a schematic view showing a main part of the suction jig shown in FIG.
FIG. 3 is a schematic view showing a porous body constituting the suction pad shown in FIG.
FIG. 4 is a schematic view showing an apparatus for manufacturing a suction pad of the suction jig shown in FIG.
[Explanation of symbols]
10 Suction jig
11 Jig body
11a Opening
12 suction pads
12a Suction surface
16 dense layer
17 High ventilation layer
22 Carrier sheet
L1 First slurry layer
L2 Second slurry layer
L Composite slurry layer
R interior space
S composite green sheet
W Parts to be adsorbed

Claims (6)

In an injection molding machine, a suction jig for sucking and conveying a part to be sucked such as a molded product or an insert part,
A suction jig comprising: a suction pad serving as a suction surface on which a component to be suctioned is sucked; and wherein the suction pad is made of a porous metal body having air permeability. The suction jig according to claim 1, wherein the suction pad is attached to the jig main body so as to close an opening of the jig main body having an internal space. The suction pad includes a dense layer provided as the suction surface and having fine pores, and a highly permeable layer provided on the back of the dense layer and having pores larger than the fine pores of the dense layer. The suction jig according to claim 1. It is a manufacturing method of the suction jig of Claim 1 or 2, Comprising:
A slurry layer forming step of forming a slurry layer by extending a slurry containing metal powder on a carrier sheet by a doctor blade method,
Drying the slurry layer to form a green sheet,
A firing step in which the green sheet is degreased and sintered to obtain a fired body,
A process of forming and forming the fired body or the green sheet to give a shape as the suction pad, thereby manufacturing the suction pad. The method for manufacturing a suction jig according to claim 4,
After the slurry layer forming step, a slurry layer stacking step of stacking a slurry layer by extending a slurry made of a component different from the slurry on the slurry layer by a doctor blade method,
A method for manufacturing a suction jig, wherein the slurry layer laminating step is performed one or more times. Claim 3 is a method of manufacturing a suction jig,
A slurry layer forming step of forming a slurry layer by extending a slurry containing metal powder on a carrier sheet by a doctor blade method,
A slurry layer laminating step of performing one or more steps of laminating a slurry layer by extending a slurry composed of a component different from the slurry onto the slurry layer by a doctor blade method,
Among the respective slurry layers composed of the respective slurries having different components, a foaming step of foaming a foaming agent contained in the slurry layer forming the high air permeability layer to form a foamed green sheet,
A drying step of drying the foamed green sheet to form a green sheet;
A firing step in which the green sheet is degreased and sintered to obtain a fired body,
And performing a forming step of processing and forming the fired body or the green sheet to give a shape as the suction pad, thereby manufacturing the suction pad having the dense layer and the high air permeability layer. Manufacturing method of suction jig.

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