JPH07241881A - Method and apparatus for manufacturing porous body - Google Patents

Abstract

PURPOSE:To provide a method and apparatus for manufacturing porous bodies being in an almost mesh-arranged relationship with high productivity and no likelihood of filling failure due to a shortage of fluidity, and also of a breakage of a mold or pin-like porous forming material. CONSTITUTION:The method and apparatus for carrying out each process and manufacturing porous bodies comprises the steps of each process of injecting molding material into a molded body molding space 12, piercing or inserting a plurality of pins 3 into an injected plastic state molding material for forming an almost mesh-like arranged porous bodies, and pulling out a plurality of the pins 3 from the molded bodies having porous parts formed therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding method for a porous body having a large number of pores (particularly fine pores) arranged in a substantially mesh shape when viewed in cross section (hereinafter referred to as "substantially mesh-shaped porous body"). And a manufacturing apparatus, especially for forming a porous body having a thick wall in the axial direction of a hole or a plastic molding material having a low fluidity, particularly a powder for sintering such as ceramics, which has a significantly poorer fluidity than a resin. The present invention provides an injection molding method suitable for molding an organic / inorganic composite material containing a large amount of the molding material or ceramic powder to be formed.

[0002]

2. Description of the Related Art Injection molding is suitable not only for injection molding of synthetic resins but also for molding of sintered alloys and ceramics because it is suitable for mass production of members having complicated shapes and finished products and has high productivity. It has been put to practical use.

Among them, porous bodies having a large number of through holes are widely used for catalyst carriers having a honeycomb structure, chucks, filters and the like.

For example, Japanese Examined Patent Publication No. 1-55227 discloses a method of molding an injection-molded article containing a fine hole using a mold in which a fine wire is stretched in advance in a cavity, and then removing the fine wire by thermal decomposition. ing. In addition, JP-A-62-1892
No. 12 describes a ceramic filter for separating fine particles having a large number of through pores. As a method of manufacturing the same, a metal frame is prepared by forming a mold with forested metal wires and injecting the ceramic material into the frame. A method of pyrolyzing to obtain pores is described.

Further, in Japanese Patent Publication No. 5-68429, a film is formed on the surface of a plurality of rod-shaped cores with a material lower than the melting point of the cores, the films are focused, and the core film is heated. A method for producing a porous body by molding under pressure and fusing is described.

Further, as a method of injection molding a molded body having a large number of through holes, Japanese Patent Laid-Open No. 261812/1992 discloses that a core pin for forming a hole is previously formed inside a cavity (molded body space) of a mold. After fixedly supporting both ends,
A method of injecting a molding material to form a molded product having pores is described. In this method, the tip of the core pin is clamped and fixed by a pin holder and a collet of a fixed molding die, and a slide insert penetrating the core pin is arranged in the cavity to prevent deformation of the core pin during injection molding. .

[0007]

As described above, according to the conventional method, when an injection molding is performed on a porous body having through-holes having a substantially mesh shape in cross section, a large number of pins are juxtaposed and held inside the cavity. It is necessary to fill the molding material in the closed state. However, in general, there are many plastic materials whose fluidity changes with temperature, in which case the pin temperature is lower than the temperature of the molding material itself, so the viscosity of the material increases near the pin and the fluidity drops significantly. To do. Moreover, the skin (skin) layer of the material formed on the part that contacts the pin is
Since it is a solidified layer that does not flow or hardly flows,
The space that can flow between the pins is reduced to 80 to 90% of that when there is no material, and the flow resistance suddenly increases. As a result, if the number of pins is large (or the distribution density of pins is high) at a molding pressure and a molding speed that allow sufficient filling when the number of pins is small, defective molding such as poor filling or weld lines will occur. Occurs. Alternatively, since the molding pressure and the molding speed required for filling become high, an excessive force is applied to the pin in the lateral direction, and the pin collapses or breaks, which causes fatal damage to the mold.

These problems are more difficult when the molding material contains a solid content (sintering powder or the like), because the fluidity is significantly lower than that of the resin alone. It will be a situation.

Further, even if the molding material is a resin alone, if the thickness of the porous body to be the product becomes thick in the axial direction of the porous cell, the fluidity is remarkably reduced for the same reason, and molding failure occurs. Or pin breakage becomes a serious problem, and in order to avoid this, it is necessary to make the injection speed extremely slow,
Productivity is extremely reduced.

Therefore, the basic object of the present invention is to provide a manufacturing method and a manufacturing apparatus which do not cause molding failure due to insufficient flow, damage to mold pins, clogging, and high productivity of such a porous body. Is.

The present invention is particularly applicable to a non-flowable molding material for molding a porous body having a large wall thickness in the axial direction of a porous cell or molding a powder for sintering such as ceramics containing a large amount of solid content. It is a specific object to provide a method and an apparatus for manufacturing a substantially mesh-shaped arrayed porous body suitable for injection molding.

Another specific object of the present invention is to prevent the pin or the like forming the hole from being destroyed due to the pressure increase due to the interposition of the pin which is the hole forming means when forming the perforations arranged in a substantially mesh shape, and the accuracy is improved. It is an object of the present invention to provide a manufacturing method and a device capable of forming good porosity.

Thus, the present invention is a method capable of mass-producing the substantially mesh-shaped arrayed porous body obtained by the present invention for applications requiring a large surface area such as filters, chucks, catalyst carriers, enzyme carriers and radiators. It aims to provide.

[0014]

Means related to a manufacturing method of the present invention is, firstly, a molding body forming space (cavity) of a mold.
A step of injecting a molding material into the mold, a step of inserting or inserting a plurality of pins into the injected plastic molding material to form a large number of holes arranged in a substantially mesh shape when viewed in cross section, and the substantially mesh. And a step of pulling out the plurality of pins from a molded body in which a large number of holes are formed in a substantially meshed array porous body.

As a preferable means according to the first manufacturing method, secondly, in the step of inserting or inserting a plurality of pins in the molding material, a portion corresponding to the volume of the plurality of pins inserted or inserted. The method for producing a substantially mesh-shaped arrayed porous body according to the first means, wherein the molded body space is expanded to a predetermined shape.

[0016] Thirdly, as a preferable means for the first manufacturing method, thirdly, the molding material contains a large amount of ceramic powder and / or metal powder, and degreasing and firing are carried out after molding. It is a method for producing a substantially mesh-shaped arrayed porous body according to the second means.

As a preferred means according to the first manufacturing method, fourthly, a portion of a plurality of pins to be inserted or inserted in the molding material, where a large number of holes are formed in the molding, is tapered. It is a method of manufacturing a substantially mesh-shaped arrayed porous body according to any one of the first to third means which is tapered.

As a preferable means for the first manufacturing method, fifthly, a surface perpendicular to the inserting or inserting direction of the pin of the molded body in which a large number of holes are formed is scraped off after molding to form a large number of holes. Is a method for manufacturing a substantially mesh-shaped arrayed porous body according to a fourth means for adjusting the size of the opening diameter.

The manufacturing apparatus of the present invention comprises, firstly, means for injecting a molding material into a molding body forming space (cavity) of a mold,
A plurality of pins are inserted or inserted in the injected block-shaped molded body having plasticity to form a large number of holes arranged in a substantially mesh shape in cross section, and the molded body has a predetermined hardness. It is characterized in that it is provided with a pin inserting / extracting means for removing the plurality of pins after solidification to form a porous body, and a plurality of guide holes of a predetermined shape for guiding the pins in the space direction of the molded body on the mold wall. It is an apparatus for producing a substantially mesh-shaped porous body.

A preferred aspect of the first manufacturing apparatus is
Secondly, a part of the molded body space that is movably arranged so as to enlarge or reduce the molded body space is defined in accordance with the penetration volume of the plurality of pins inserted into or inserted into the molded body space. The apparatus for producing a substantially mesh-shaped arrayed porous body according to the first means, which is provided with a movable mold wall.

[0021]

The manufacturing method of the present invention is basically different from the conventional method of filling the material into the space (cavity) of parallel or standing shaped bodies of pins or fine wires, and first, a block-shaped shaped body is formed. The basic concept is to press the pin assembly while it is in the plastic state to form the pores arranged in a substantially mesh shape. The method for producing a substantially mesh-shaped arrayed porous body according to the present invention is carried out as follows.

First, at the initial stage of injection molding, the molding material is injected into the mold while the pin assembly forming the holes is stored outside the mold so as not to hinder the filling of the molding material. For example, a step of forming a plate-shaped molded body is taken.

If the injection amount (volume) of the molding material is reduced in advance by the amount corresponding to the volume of the pin assembly to be inserted or inserted in the next step, the molding body space and the like will not be destroyed due to excessive pressure rise, and It is preferable because the pin can be easily inserted or inserted.

Second, while the molded body has plasticity (for example, in a molten state or a semi-molten state), the pin assembly is advanced to be inserted into the plasticized state of the molded body, thereby forming a substantially mesh-like arrangement. Take the step of forming a porous body.

In this step, if the molded body space is expanded to a predetermined volume by the volume corresponding to the plurality of inserted or inserted pins, the molded body space or the like will not be destroyed by the pressure increase, and the pin will not be destroyed. Is preferable because it can be easily inserted or inserted.

As the molded body space (cavity) expanding means, a movable mold wall for connecting to a movable portion such as a cylinder can be provided on one surface of the mold, and the movable mold wall is moved to move the mold. It is possible to expand / reduce the content and compress / expand the injected molding material.

Further, a guide hole corresponding to the pin aggregate (pin diameter) can be provided on the movable mold wall to be used as a pin guide means and a movable wall of the mold. Providing this means is preferable because the risk of breakage due to taking in and out of the pin is reduced.

The pin may be provided with pores so that the molding material can be sucked out from the molded body space. In that case,
Since the molding material is insufficient, it is preferable to move the movable wall of the mold forward to reduce the space of the molded body in order to form a uniform molded body.

Third, a step of extracting the pin assembly from the solidified or substantially solidified substantially meshed array porous body.

When the molding material is a thermoplastic resin, it is cooled or allowed to cool to solidify, and when it is a thermosetting resin, it is heated. Then, when the substantially mesh-shaped arrayed porous body is completely or partially solidified and the holes are formed, the pin aggregate is pulled out.

The solidified substantially mesh-shaped porous body obtained through the above steps is projected from the mold by the movable mold wall to obtain a finished product. After this, the degreasing and firing steps may be performed as is done with common resin products.

According to such a manufacturing method, it is not necessary to previously provide a rod-shaped body as a means for forming holes in the mold or a pin array having a mesh structure as in the conventional case, and the vicinity of the hole forming means is not required. Without causing insufficient flow of molding material in
Molding defects such as poor filling and weld lines are less likely to occur.

The manufacturing apparatus of the present invention is an apparatus capable of performing the above manufacturing process.

In the above apparatus, as means for injecting the molding material into the molding body molding space, a movable piston or screw can be used for pressure feeding. If necessary, a static mixer may be arranged at the injection inlet (nozzle) so as to increase the uniformity of the molding material.

Since the pin assembly is independent of the molded product space (cavity), it can be easily replaced according to the desired porous shape. Further, as the shape of the pin, one having an acute-angled tip portion, a taper shape, and one having a polygonal shape such as a circular shape, a semicircular shape, an elliptical shape, a star shape, or a hexagonal shape depending on the purpose of use, respectively. Can be used.

In the molded body using the tapered tapered pin, after the molding, the surface perpendicular to the insertion or insertion direction of the pin can be scraped off after the molding to adjust the size of the opening diameter of many holes. Further, in a porous body having tapered holes,
It is very easy to clean the clogged holes during use.

Further, by mutually controlling the pin assembly and the movable mold wall, the pressure applied to the molding material or the molding porous body can be adjusted, resulting in damage to the mold,
It is possible to prevent detachment and damage to the pins, and obtain a good substantially mesh-shaped porous body.

That is, a driving force generating means such as a hydraulic cylinder is connected to the pin assembly and the movable mold wall. When hydraulic cylinders are used, the hydraulic pressure of the cylinders provided for both can be monitored and adjusted, so that the volume of the pin assembly entering the molded body space where the molding material is injected can be adjusted. The movable mold wall can be moved forward and backward by detecting the changing pressure in the molded body space. Further, the movable die wall may be moved correspondingly by detecting the moving distance of the pin assembly.

A guide hole may be provided in the movable mold wall to serve as a guide means for the pin.

Further, in order to solidify the thermoplastic resin or the thermosetting resin, a cooling or heating device can be attached to the molded body space (cavity). Particularly in the case of the present invention, a cooling or heating device can be attached inside the pin for forming the hole to secure the fluidity in the vicinity of the pin at a temperature according to the characteristics of the resin, and to control the solidification rate and the like. .

As the cooling means, a copper pipe or the like having good thermal conductivity can be used, and as the heating device, a linear heater or the like can be appropriately arranged in the pin for use.

Further, in order to ensure the safety of operation, it is preferable to provide a stopper by a mechanical, optical or magnetic sensor on the driving means of the pin assembly and the movable mold wall. For example, when a hydraulic cylinder is used as the driving means, a protrusion is provided on the shaft (ram) that connects the cylinder and the pin assembly or the movable mold wall, and a corresponding recess is formed on the injection molding machine body (particularly the mold). The stopper can be provided so as to prevent the molding material (molded body space) from being compressed by a predetermined distance or more to a predetermined pressure or more so as not to break.

[0043]

EXAMPLES Hereinafter, examples will be described based on the present invention.
The present invention is not limited to this embodiment.

<First Embodiment> FIG. 1 is a schematic view of an injection molding apparatus for carrying out the manufacturing method according to the first embodiment.

A mold including a fixed mold wall 10, a movable mold wall 11 and a movable mold wall 5 is supported by an injection molding machine base (not shown), and these mold walls 5, 10, 11 are also provided. Can be brought into and out of contact with each other, and a molded body space (cavity) 12 is formed between the mold walls 10 and 11 and the movable mold wall 5. The fixed mold wall 10 is provided with a sprue 1 and a gate 2 for injecting a molding material into the molded body space 12. Nozzle 2 of injection molding machine 20 for sprue 1
2 are in contact with each other, and the extrusion mechanism 20 of the injection molding machine uses the screw 2 with the molding material fed from the hopper 24.
The nozzle 6 is pushed out from the nozzle 22.

On the movable mold wall 11, a pin assembly 3 for forming holes arranged in a substantially mesh shape when viewed in a cross section orthogonal to the hole is provided in the central space of the movable mold wall 11 with the axis of the holes. The movable mold wall 5, which is movably arranged in the direction, penetrates through the guide hole and can be freely inserted and penetrated into the molded body space 12.

The movable plate 4 to which the pin assembly 3 is attached is designed so that, when the pin assembly 3 is inserted into the molded body space 12 at the deepest position in the axial direction, the tip end of the pin assembly 3 stops just before the dividing surface 13. The movable driving force is given by a hydraulic cylinder 30 arranged behind.

It should be noted that a recess corresponding to the tip of the pin may be provided on the surface forming the dividing surface of the fixed mold wall 10, in which case the degree of insertion of the pin can be increased.

The hydraulic cylinder 30 has hydraulic chambers 32 and 33 defined by a piston 31, and the tip of a ram 34 fixed to the piston 31 has a movable plate 4 at its tip.
Connected with.

A striker 45 is provided in the middle of the ram 34, and an OFF signal is sent to the solenoid valve 38 by the contact with the forward limit limit switch 43 and the backward limit limit switch 44 to bring it into a neutral state.

When the hydraulic chamber 32 is expanded, the ram 34 is retracted to move the pin assembly 3 into the molded body space 12 via the movable plate 4.
It is designed to be pulled out from inside.

On the contrary, when the hydraulic chamber 33 is expanded, the ram 34 moves forward in the opposite direction to the above, so that the movable plate 4 is moved.
The pin assembly 3 is inserted into the molded body space 12 via the.

The hydraulic chamber 32 is connected to a solenoid valve 38 via a hydraulic pipe 35. The hydraulic chamber 33 is connected to a solenoid valve 38 via a hydraulic pipe 36 and a flow control valve 37.

The flow rate control valve 37 can control the amount of hydraulic pressure sent to the hydraulic chamber 33 to adjust the moving speed of the pin assembly.

The solenoid valve 38 can be in a neutral state as shown in FIG. 1, a state A in which the coil 41 is activated, or a state B in which the coil 42 is activated in response to a command from a controller (not shown).

In the neutral state, the hydraulic pipes 35 and 36 are both cut off, but in the state A, the hydraulic pipe 35 communicates with the hydraulic pump 40 and the hydraulic pipe 36 with the reservoir tank 39, and in the state B, the reverse. The hydraulic pipe 35 is connected to the reservoir tank 39, and the hydraulic pipe 36 is connected to the hydraulic pump 40.

Further, the movable mold wall 5 which plays a role of supporting the pin assembly 3 when moving in the molded body space 12.
Expands and contracts the molded body space 12. In the movable mold wall 5,
Each pin is inserted with a large number of guide holes corresponding to the pin assembly, and the driving force is given from the hydraulic cylinder 50.

The hydraulic cylinder 50 has hydraulic chambers 52 and 53 defined by a piston 51, and the tip of a ram 54 fixed to the piston 51 is connected to the movable mold wall 5.

A protrusion 63 is provided in the middle of the ram 54 so that the movable mold wall 5 does not come into contact with the dividing surface 13 when the movable mold wall 5 advances, and the movable mold wall 5 has a function of advancing. At the time of retreating, the retreat is limited so as not to damage the hydraulic cylinder 50, the movable plate 4, and the like.

At the time of expanding the hydraulic chamber 52, the ram 54 retracts the movable mold wall 5 so that the internal volume of the molded body space 12 becomes large.

On the other hand, when the hydraulic chamber 53 is expanded, the ram 54 moves in the opposite direction to move the movable mold wall 5 forward so that the internal volume of the molded body space 12 becomes smaller.

The hydraulic chamber 52 is connected to a solenoid valve 58 via a hydraulic pipe 55. The flow control valve 57 controls the amount of hydraulic pressure sent to the hydraulic chamber 53 so that the moving speed of the movable mold wall 5 can be varied.

The hydraulic chamber 53 includes the hydraulic pipe 56 and the flow control valve 5.
It is communicated with the solenoid valve 58 via 7. The flow control valve 57 controls the amount of hydraulic pressure sent to the hydraulic chamber 53 so that the moving speed of the movable mold wall 5 can be varied.

The solenoid valve 58 can take a neutral state as shown in FIG. 1 or a state A'in which the coil 61 is activated and a state B'in which the coil 62 is activated by a command from a controller (not shown).

In the neutral state, both the hydraulic pipes 55 and 56 are cut off. In the state A ', the hydraulic pipe 55 communicates with the hydraulic pump 60 and the hydraulic pipe 56 with the reservoir tank 59, and in the state B'. On the contrary, the hydraulic pipe 55 is connected to the reservoir tank 59, and the hydraulic pipe 56 is connected to the hydraulic pump 60.

Next, the steps of the manufacturing method and the operation of the manufacturing apparatus according to this embodiment will be described with reference to FIGS.

FIG. 2 is a cross-sectional view of the injection molding apparatus showing the steps of the manufacturing method and the operation of the manufacturing apparatus according to the first embodiment, showing a state in which the molding material is filled, particularly the fixed mold wall 10 and It shows the completion of mold clamping in which the movable mold wall 11 is in close contact.

The coil 62 of the solenoid valve 58 is operated in advance to stop the movable mold wall 5 at a predetermined position in the molded body space 12, and the solenoid valve 58 is placed in a neutral state.

At this time, the pin assembly 3 can be stopped in a state in which the tip of the pin assembly 3 is slightly exposed from the movable mold wall 5 into the molded body space 12 in order to prevent the molding material from protruding. However, in any case, the opening of the movable mold wall 5 is held in a closed state.

When the molding material is filled into the molding body space 12 from the injection molding machine 20, the molding material is injected and filled while contacting the movable mold wall 5. The position of the movable mold wall 5 may be the position advanced from the beginning,
It can be appropriately changed according to the characteristics of the molding material, the injection pressure, and the like.

FIG. 3 is a sectional view of the injection molding apparatus showing the steps of the manufacturing method according to the first embodiment.
It shows a state of inserting into the molded body space 12 filled with the molding material.

After the molding material is filled in the molding body space 12 to form a block without holes, the coil 42 of the solenoid valve 38 is formed in the block in the molten state or the semi-molten state (FIG. 2). Work piston 3
1, the pin assembly 3 is advanced through the ram 34 and the movable mold wall 4 to push the pin into the molded body space.

At this time, the volume of molding material corresponding to the volume of the pin assembly 3 that must be removed is balanced by the movable mold wall 5 retracting (neutral state,
Or state A ').

The balance control of the pin assembly 3 and the movable mold wall 5 is performed by the flow rate control valve 37 and the solenoid valve 38 having a pressure gauge in the pin assembly 3 and the pressure gauge in the movable mold wall 5. Can be performed by the flow rate control valve 57 and the solenoid valve 58 provided with a control device (not shown).

That is, if the solenoid valve 58 on the movable mold wall 5 side is in the state A'when the pin assembly 3 is inserted into the molded body space 12, the molding is automatically performed when the pin assembly 3 is inserted. It retreats as the pressure in the body space 12 increases.

If the solenoid valve 58 on the movable mold wall 5 side is in the neutral state, the flow control valve 5 equipped with a pressure gauge
7 detects the increase in pressure, and a control device (not shown) allows the solenoid valve 58 and the flow rate control valve 57 to shift to the state A ′ to retract the movable mold wall 5 by a predetermined amount.

FIG. 4 is a sectional view of the injection molding apparatus showing the steps of the manufacturing method according to the first embodiment.
It shows a state of drawing out from the substantially mesh-shaped porous body.

After the pin assembly 3 is inserted (FIG. 3), the coil 41 of the solenoid valve 38 is actuated after a lapse of a predetermined time to retract the pin assembly 3 through the piston 31, the ram 34 and the movable mold wall 4. Pull out.

FIG. 5 is a cross-sectional view of the injection molding apparatus for showing the steps of the manufacturing method according to the first embodiment, showing how the substantially mesh-shaped arrayed porous body is demolded.

In the state where the pin assembly 3 is pulled out from the molded product, the dividing surface 13 is moved by the mold opening operation, and the space between the pin assembly 3 and the mold wall 11 is opened.

Then, the coil 6 of the solenoid valve 58
2 is operated to move the movable mold wall 5 forward through the piston 51 and the ram 54 to eject the molded body.

After the product has been taken out, the coil 62 of the solenoid valve 58 is activated to retract the movable mold wall 5 via the piston 51 and the ram 54.

When the molding material contains a large amount of ceramic powder and / or metal powder and is made into a sintered porous body, ordinary degreasing and firing steps are carried out after molding the substantially mesh-shaped porous body. . Note that this step may be omitted depending on the application.

Further, in the case of the molded body using the tapered tapered pin, after the molding, the surface perpendicular to the insertion or insertion direction of the pin is scraped off by a process such as cutting or grinding after the molding, so that the end face of the molded body is cut off. The size of the opening diameter of the hole can be adjusted. Further, in a porous body having tapered holes, it is very easy to clean the holes clogged during use.

The molding materials used in the above manufacturing method and manufacturing apparatus include thermoplastic resins from general-purpose resins such as polyethylene and acrylic resins to various engineering plastics such as polyamide and polyacetal. Resin can also be used.

Further, the manufacturing method and manufacturing apparatus of the present invention are
In particular, it is not affected by the flowability of the molding material and is excellent in maintaining good injection characteristics even with a non-flowing material. Therefore, a molding material containing a large amount of solid content, for example, a powder for sintering, is made of alumina. , Oxide powders such as zirconia, nitrides such as silicon nitride, carbides such as silicon carbide, non-oxide ceramics such as boride, and molding materials containing these compounds, as well as iron powder and stainless powder. Metal powder, such as
A molding material containing cermet powder or the like can be used, and further, it can be applied to an organic / inorganic fiber-containing composite molding material. It should be noted that the injection molding material is not particularly limited in its application, whether the internal material of the final product is dense or finely porous. An excellent substantially mesh-like arrayed porous body can be obtained with any of the molding materials.

The binder for injection molding added to these powders is not particularly limited, but usual thermoplastic resins, waxes, plasticizers, lubricants, dispersants and the like may be added.

[0088]

Therefore, the present invention provides a highly productive manufacturing method and manufacturing apparatus, which do not cause molding failure due to insufficient flow, damage to the mold, and clogging when molding the substantially mesh-shaped porous body. be able to.

Particularly, in the case of using a molding material of a porous powder having a large thickness in the axial direction of the pores of the porous material or a molding material of sintered powder such as ceramics containing a large amount of solid content, a molding material having a low fluidity is used. A manufacturing method and a manufacturing apparatus suitable for molding can be provided.

Moreover, when forming the substantially mesh-shaped arrayed pores, the die or the like is not destroyed due to a pressure increase at the time of inserting or inserting the pin which is the means for forming the holes, and the pins can be easily inserted to form the substantially mesh shape. A method and apparatus for forming an array porous body can be provided.

Then, the substantially mesh-shaped arrayed porous body obtained by the present invention can be provided for applications requiring a large surface area such as filters, chucks, catalyst carriers, enzyme carriers, radiators and the like.

In the above description, the holes are mainly through holes, but according to the present invention, some or all of the holes may not be through holes (bottomed holes), and various pins may be used. It has an additional advantage of the present invention that it can be formed into a cross-sectional shape or can be tapered, and can cope with various modifications. In addition, after forming a molded body in which a hole is formed with a tapered pin, the opening diameter of the hole can be adjusted by scraping off the surface perpendicular to the direction in which the pin is inserted or inserted. With a porous body having pores, it is very easy to clean the pores clogged during use.

[Brief description of drawings]

FIG. 1 is a sectional view of an injection molding apparatus for carrying out a manufacturing method according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the injection molding apparatus for showing the steps of the manufacturing method according to the first embodiment of the present invention, showing how the molding material is filled.

FIG. 3 is a cross-sectional view of the injection molding apparatus showing the steps of the manufacturing method according to the first embodiment of the present invention, showing how the pin assembly 3 is inserted into the molding body space 12 filled with the molding material. Show.

FIG. 4 is a cross-sectional view of the injection molding apparatus showing the steps of the manufacturing method according to the first embodiment of the present invention, showing how the pin assembly 3 is pulled out from the porous body.

FIG. 5 is a cross-sectional view of the injection molding apparatus showing the steps of the manufacturing method according to the first embodiment of the present invention, showing how the porous body is demolded.

[Explanation of symbols]

 3 pins (pin assembly) 4 movable plate 5 movable mold wall 10 fixed mold wall 11 moving mold wall 12 molded body space (cavity) 30 hydraulic cylinder 37 flow control valve 38 solenoid valve 43 limit switch 44 limit switch 50 hydraulic Cylinder 57 Flow control valve 58 Solenoid valve

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location // B29K 503: 06 509: 02 B29L 31:14 (72) Inventor Shigemi Katori Kanagawa Yokohama, Kanagawa Asahi Glass Co., Ltd. Central Research Laboratory, 1150, Hazawa-machi, Tokyo (72) Inventor Akira Yotsuji Akira Hiranocho, 2-3-11-1101, Hiranocho, Chuo-ku, Osaka City, Osaka Prefecture Koki Engineering Limited

Claims (7)

[Claims] 1. A step of injecting a molding material into a molding body forming space of a mold, and a plurality of pins being inserted or inserted into the injected plastic molding material and arranged in a substantially mesh shape when viewed in cross section. A method of manufacturing a porous body, comprising: a step of forming a large number of holes; and a step of pulling out the plurality of pins from a molded body having a large number of holes formed in a substantially mesh shape. 2. The step of inserting or inserting a plurality of pins into the molding material, the molded body space is expanded into a predetermined shape by an amount corresponding to the volume of the plurality of pins inserted or inserted. The method for producing a porous body according to 1. 3. The method for producing a porous body according to claim 1, wherein the molding material contains a large amount of ceramic powder and / or metal powder, and degreasing and firing are carried out after molding. 4. A portion of a plurality of pins to be inserted or inserted in the molding material, where a large number of holes are formed in the molding, is tapered. The method for producing a porous body according to item 6. 5. A porous body according to claim 4, wherein a surface of the molded body having a large number of holes formed therein, which is perpendicular to the inserting or inserting direction of the pins, is scraped off after molding to adjust the size of the opening diameter of the large number of holes. Body manufacturing method. 6. A means for injecting a molding material into a molding body forming space of a mold, and a plurality of pins inserted or inserted into the injected block-shaped molding body having a substantially mesh shape when viewed in cross section. A plurality of holes arranged in a line, and a pin insertion / extraction means for forming a porous body by detaching the plurality of pins after the molded body is solidified to a predetermined hardness; An apparatus for manufacturing a porous body, comprising a plurality of guide holes of a predetermined shape for guiding in the body space direction. 7. A part of the molded body space movably arranged so as to enlarge or reduce the molded body space in accordance with the intrusion volume of the plurality of pins inserted into or inserted into the molded body space. The porous body manufacturing apparatus according to claim 6, further comprising a movable mold wall that defines the wall.