JPH10309712A - Extrusion holding mold for honeycomb structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extrusion molding mold that is easy to be disassembled and assembled and which can provide a honeycomb structure that is free from deformation and crack. SOLUTION: This extrusion molding mold for a honeycomb structure is constituted by a plurality of comb members 15, 15 each comprising a plurality of square rods 11, 11, 11 disposed in line at predetermined intervals and which are detachably assembled in such a manner as to intersect with each other, and a honeycomb-like cell hole is formed between the plurality of square rods 11, 11 in such a manner as to be continuous with the same diameter being kept from the back to the front, whereby it is possible to easily disassemble the comb members for easy cleaning, and moreover since cell holes continuous with the same diameter from the back to the front are formed, it is possible to extrude clay straight from the back to the front in a linear fashion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion die for extruding a honeycomb structure.

[0002]

2. Description of the Related Art Conventionally, a honeycomb structure H as shown in the sectional view of FIG. 11 has been used, for example, as a catalyst carrier for an automobile. Conventionally, such a honeycomb structure H is formed by an extruder. When performing extrusion molding, a molding die 51 as shown in the side sectional view of FIG. 12 and the front configuration diagram of FIG. 13 is used.
As shown in the enlarged perspective view of the main part of FIG.
After the formation of the feed holes 2, 52, the feed passages 54, 54 are formed by drilling from the back side, and the cell holes 53 formed between the hexagonal columns 52, 52 and the feed passage 5 are formed.
4 are eccentrically communicated, and the raw material is extruded from the inlet passage 54 toward the cell hole 53, thereby forming the honeycomb structure H as shown in the cross-sectional view of FIG.

[0003] Since such a conventional molding die 51 is formed by subjecting a honeycomb pattern to electric discharge machining from the front side and then forming it integrally from the back side, machining errors such as misalignment are likely to occur. When the raw material is extruded while being deformed from the feed passage 54 into the cell hole 53, residual stress remains in the extruded honeycomb structure H, and the raw material may be dried during drying. There is a problem that it causes cracks and bending. In addition, the conventional molding die 51 has a complicated structure and requires a large processing cost, and the interval between the cell holes 53 formed between the hexagonal pillars 52, 52 is narrow, so that it takes a lot of trouble to clean. Since the cell hole 53 and the feed passage 54 are eccentric and the internal passage is complicated, it is difficult to completely clean the inside even by using an ultrasonic cleaner or the like. Further, since the conventional molding die 51 has an integral structure, it is impossible to plate or coat the inside of the conventional molding die 51. Further, in the conventional molding die 51, the molding state of the honeycomb structure H is actually confirmed. It is extremely difficult to carry out additional work and partial repairs after the work.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is easy to clean and repair, and cracks or bends occur in the formed honeycomb structure. A first object of the present invention is to provide a hard extrusion molding die, and a first gist of the invention is to provide a die which is fitted in a peripheral stopper fixed to an extruder for extruding a honeycomb structure, The mold is a honeycomb-shaped cell in which a plurality of comb members formed by arranging a plurality of prisms in a comb shape at predetermined intervals are detachably combined, and the plurality of prisms are connected to each other in a honeycomb-shaped cell having the same diameter from the back surface to the surface. That is, the holes are formed. Further, a second gist is that in a mold which is fitted in an outer peripheral stopper fixed to an extruder for extruding a honeycomb structure, a contact surface where the mold and the outer peripheral stopper come into contact with each other. An air vent groove is formed in the air vent groove, a vacuum device is communicated with the air vent groove, and air is drawn out in a direction substantially perpendicular to the extrusion direction of the honeycomb structure pushed out of the mold.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part of a state in which a die is attached to a tip of an extruder.
Inside there is a screw 3 that extrudes clay,
A fixing member 4 is fixed to the outer periphery of the distal end side of the cylinder 2 so as to protrude outward, and an outer frame 6 is fixed to the fixing member 4 via bolts 5 and 5. 6
The outer peripheral stopper 7 is fixedly mounted via a bolt 8 therein, and a die 9 is attached to the outer peripheral stopper 7 so as to be fitted therein. And a plurality of prisms 11, 11, 11 protruding from the base 10 toward the distal end side. The fitting recess 7b for fitting the base 10 of the mold 9 is formed in a concave shape on the back surface side, and communicates with the fitting recess 7b to form a central portion on the back side. Is formed with a central hole 7a which is open on the front side, and a plurality of air vent grooves 7 are formed on the bottom surface of the fitting recess 7b on the outer periphery of the central hole 7a.
c, 7c, 7c are formed so as to be depressed in an inclined manner, and a peripheral groove 7d is formed in the outer periphery of the plurality of air vent grooves 7c, 7c, 7c. A communication hole 7e is formed in the peripheral groove 7d so as to communicate with the outside. As shown in FIG. 1, a vacuum pipe 13 is connected to the communication hole 7e from the outside. Is provided with a vacuum meter 14, and the distal end side of the vacuum pipe 13 is connected to an external vacuum device.

In this embodiment, as shown in FIG.
To form a honeycomb structure H in a continuous manner, and the extruded honeycomb structure H is cut at a predetermined position.
In this example, the honeycomb structure H is formed using clay having a coarse particle size for tiles or tiles so that such a honeycomb structure H can be formed. The mold 9 is a perspective view from the top side in FIG.
In addition, it is configured as shown in a perspective view from the back side in FIG. 4, and a plurality of prisms 11, 11, 11 are arranged in a protruding manner at a predetermined interval from the center of the base 10 toward the front side, Cell holes are formed between the prisms 11, 11, and 11 so that the honeycomb structure H as shown in FIG. 2 can be extruded.
0 on the outer periphery of the prism 11 on the surface side of the
Air bleed groove 10 that matches air bleed groove 7c formed in
a, 10a, and 10a can be formed in a concave shape, and when the base 10 is fitted into the fitting concave portion 7b of the outer peripheral stopper 7, the air vent groove 7c and the air vent groove are formed. The air release groove 7c and the air release groove 10a are formed on either side of the outer stopper 7 or the base 10, or are formed on both sides. It may be.

FIG. 5 is a perspective view, partially cut away, of the base 10 of the mold 9. Referring to FIG. 5, a central hole 10b is formed in the center of the base 10 so as to penetrate the plurality of prisms 11, 11, 11. In this example, five vertical fitting grooves 10c, 10c, 10c and two horizontal fitting grooves 10d, 10d are formed in a concave shape on the rear surface on the outer peripheral side. I have. Each of the fitting grooves 10c and 10d has a base 1
The comb member 15 assembled as shown in the rear perspective view of FIG. 6 and the front perspective view of FIG. That is, the comb member 15 shown in FIGS.
Is constructed by assembling two comb members and five comb members in an intersecting manner.

That is, FIG. 9 is an exploded view before assembling, and FIG.
As shown in the schematic diagram of FIG.
The five comb members 15 fitted into the fitting grooves 10 c, 10 c, 10 c of the base 10 are respectively formed with concave grooves 16 a in a concave shape on the front side of the flat plate portion 16. On the other hand, two comb members 15 fitted in the fitting grooves 10d, 10d of the base 10 are provided.
Are five concave grooves 1 in a concave shape on the back side of the flat plate portion 16 respectively.
6b and 16b are formed. Therefore,
Five comb members 15 are fitted into the concave grooves 16b, 16b, 16b in an intersecting manner from the back side, and the concave grooves 16a of the comb member 15 are formed.
In FIG. 6, five comb members 15 and two comb members 15 are crossed in a cross shape.
6 and 7, the flat plates 16, 16 are fitted into the fitting grooves 10c, 10d from the back side of the base 10 shown in FIG. , The comb member 15 can be integrally attached to the base 10, and in this state, the central hole 10b of the base 10 is
The plurality of prisms 11 are inserted into the inside.

In this manner, a mold 9 as shown in FIGS. 3 and 4 is formed, and the mold 9 is fitted with the base 10 in the fitting recess 7b in the outer stopper 7 shown in FIG. In addition, the prism 11 can be housed in the center hole 7a, and the mold 9 is easily assembled and disassembled by the comb members 15, 15, 15 when it is clogged. It can be removed, disassembled and cleaned, making it extremely easy to disassemble and clean.

In such a mold 9, the cell holes continuous from the back side to the front side are formed by the plurality of prisms 11, 1.
Since it is formed between 1 and 11, it becomes a cell hole of the same diameter from the back side to the front side, and the clay extruded from the screw 3 side is straight from the back side of the base 10 to the exit side of the mold 9. Since it is extruded, it is not extruded through a complicated passage as in the past, so that even a coarse-grained tile clay can be extruded very easily, and a thin honeycomb structure H having a small thickness between each cell hole can be easily formed. In addition, the honeycomb structure H having an extremely small cell hole can be favorably formed.

Further, in this embodiment, when the clay which passes through the mold 9 during the extrusion molding is operated by the vacuum device, the air is passed from the vacuum pipe 13 through the communication hole 7e, the peripheral groove 7d, and the air vent groove 7c. Is pulled out in a direction substantially perpendicular to the direction of extrusion of the clay, so that the clay is straightened and spreads in the mold 9 at right angles due to the extraction of the air. The separation of particles can be prevented, and the density of clay particles increases,
Since the density is made uniform and the internal bubbles are completely drawn out, the honeycomb structure H can be satisfactorily formed, which is densified and free from bending and distortion when dried and fired after being extruded. Becomes As described above, since the air is drawn out by the vacuum device when passing through the inside of the mold 9 on the tip end side, the honeycomb structure H having a good density distribution and no distortion is obtained, and a product excellent in strength without bending and excellent in bending. It can be.

For example, a groove is formed in a notch shape from the side surface or the tip side of each prism 11, and a piano wire 12 or a thin blade is fitted into the groove, as shown in FIG. If the piano wire 12 and the like are fixed between the prisms 11, 11, 11 of the honeycomb structure H, a cutting line along the extrusion direction can be formed in the honeycomb structure H by the piano wire 12 near the tip of the mold 9. And this piano wire 1
If the number of 2 is arranged in 2 or 3 or 4
The honeycomb structure H can be later divided into two, three or four parts, and the honeycomb structure H is easily divided by the cut surface formed through the piano wire 12 after drying or firing. Can be done. In this example, the prism 11 has a rectangular shape, but each prism 11 may have a hexagonal shape or a triangular shape. In this example, a case where the five comb members 15 and the two comb members 15 are assembled to cross each other is illustrated, but the two comb members 15 are omitted without crossing the cross members. In this case, a plurality of comb members 15 may be arranged in parallel, and in this case, the fitting grooves 10 c,
What is necessary is just to form only 10c, 10c, 10c, and 10c.

[0013]

According to the present invention, there is provided a mold which is fitted in an outer peripheral stopper fixed to an extruder for extruding a honeycomb structure, wherein the mold has a plurality of prisms at predetermined intervals. By combining a plurality of comb members arranged in a comb shape in a detachable manner so as to form a honeycomb-shaped cell hole continuous with the same diameter from the back surface to the front surface between the plurality of prisms. , The comb member can be easily disassembled, etc., and cleaning can be performed easily. Moreover, since continuous cell holes with the same diameter are formed from the back side to the front side, the clay can be pushed straight out from the back side to the front side It is possible to extrude a good honeycomb structure by extruding clay for tiles and tiles with coarse particles. Has an effect that can be.

[0014] Further, in a mold which is fitted in an outer peripheral stopper fixed to an extruder for extruding a honeycomb structure, air is released from a contact surface between the mold and the outer peripheral stopper. A groove is formed, a vacuum device is communicated with the air vent groove, and air is drawn out in a direction substantially perpendicular to the extrusion direction of the honeycomb structure pushed out of the mold, so that the inside of the mold is released by air vent. The clay spreads in the direction perpendicular to the extrusion direction, the clay forms a good density distribution in the mold in close contact, and the air bubbles inside are also removed satisfactorily. This has an effect that a good honeycomb structure that does not generate can be obtained.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part showing a mounting structure of a die on a tip end side of an extrusion molding machine.

FIG. 2 is a perspective view of a honeycomb structure extruded from a mold.

FIG. 3 is a perspective view illustrating a configuration of a mold from the front side.

FIG. 4 is a perspective view showing the configuration of the mold from the back side.

FIG. 5 is a partially cutaway perspective view of the base of the mold as viewed from the rear side.

FIG. 6 is a perspective view of a comb member constituting a mold as viewed from the back side.

FIG. 7 is a perspective view of the comb member viewed from the front side.

FIG. 8 is an exploded perspective view showing a configuration before a comb member is assembled.

FIG. 9 is a perspective view showing an assembly structure of a comb member.

FIG. 10 is a perspective view of the outer peripheral stopper from the back side.

FIG. 11 is a cross-sectional configuration diagram of a hexagonal honeycomb structure.

FIG. 12 is a side sectional configuration view of a conventional molding die.

FIG. 13 is an arrangement diagram of cell holes and passages as viewed from the front side of a conventional molding die.

FIG. 14 is an enlarged perspective view of a main part of a conventional molding die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extrusion molding machine 2 Cylinder 3 Screw 6 Outer frame 7 Outer perimeter stopper 7a Center hole 7b Fitting recess 7c Air release groove 7d Peripheral groove 7e Communication hole 9 Die 10 Base 10a Air release groove 10b Central holes 10c, 10d Fitting groove DESCRIPTION OF SYMBOLS 11 Prismatic column 12 Piano wire 13 Vacuum pipe 15 Comb member 16 Flat plate part 16a, 16b Groove

Claims (2)

[Claims] 1. A mold which is fitted and fitted to an outer metal stopper fixed to an extruder for extruding a honeycomb structure, wherein the mold has a plurality of prisms in a comb shape at predetermined intervals. A plurality of comb members arranged in a row are detachably combined to form a honeycomb cell hole having the same diameter and continuous from the back surface to the front surface between the plurality of prisms. Extrusion mold for the structure. 2. A mold which is fitted into an outer stopper which is fixed to an extruder for extruding a honeycomb structure, wherein air is released from a contact surface between the mold and the outer stopper. Forming a groove, connecting a vacuum device to the air vent groove, and extracting air in a direction substantially perpendicular to the extrusion direction of the honeycomb structure extruded in the mold. Extrusion mold.