JP5361661B2 - Breaker plate for extrusion molding machine and extrusion molding machine using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a breaker plate for molding a molded body by an extrusion molding machine using a body consisting of a ceramic material, suppressing cracks in the extrusion direction of the molded body generated in drying or firing the molding body thereafter, and an extrusion molding machine using the same. <P>SOLUTION: The breaker plate 5 has a plurality of through-holes 12 serving as a passage of the body of the extrusion molding machine 1 manufacturing the molded bodies using the body consisting of the ceramic material. Openings of the through-holes 12 disposed at the outermost sides have a shape of a long hole 12b along a contour of the molded body. Few parts of joined surfaces of the body where resin and moisture easily moving in the body easily gather are formed on the surface of the molded body corresponding to the body having passed through the long holes 12b, reducing the risk of causing density difference, and the cracks in the extrusion direction of the molded body caused on the surface of a dried body or a sintered body can be suppressed, when the molded body shrinks by elimination of the resin or moisture by the heat received in the later processes of drying and firing. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a breaker plate for an extrusion molding machine and an extrusion molding machine using the same.

  Conventionally, an extrusion molding method has been used as a molding method for obtaining a molded body having a continuous cross-section, such as a rod shape or a cylindrical shape. Of these extrusion molding methods, a screw-type extrusion molding machine is generally used to form a long molded body exceeding 2 m, and a clay, which is a molding raw material prepared in a clay shape, is used as a specific outlet. By extruding from a mold having a shape, a molded body having a specific cross-sectional shape can be continuously formed, so that a long rod-shaped or cylindrical molded body can be obtained.

  FIG. 9 is a schematic cross-sectional view showing a conventional screw-type extruder.

  The screw-type extrusion molding machine 60 shown in FIG. 9 has an upper screw 64 (two in a direction perpendicular to the paper surface in FIG. 9) comprising two shafts 64a and blades 64b installed in parallel in the upper barrel portion 63. And a lower screw 68 including a shaft 68a and a blade 68b installed in the lower barrel portion 67. The upper stage screw 64 is connected and fixed to the upper stage bearing 70 on both sides, the lower stage screw 68 is connected and fixed to the lower stage bearing 71 with one side support, and the upper stage screw 64 and the lower stage screw 68 are connected to a power source (not shown). A vacuum chamber 66 is provided between the upper screw 64 and the lower screw 68, and a vacuum pump (not shown) for evacuating the inside of the extrusion molding machine 60 is connected thereto. Further, a clay inlet 62 is opened in a part of the upper barrel portion 63, and a breaker plate 65 and a mold 69 are connected to the outlet side of the lower barrel portion 67.

  FIG. 10 shows a conventional breaker plate provided in the extruder of FIG. 9, (a) is a plan view, and (b) is a cross-sectional view taken along line EE ′ in (a). .

  The breaker plate 65 shown in FIG. 10 is made of stainless steel, chrome steel, chrome molybdenum steel, nickel chrome steel, nickel chrome molybdenum steel, carbon tool steel, alloy tool steel, or the like, and includes a plurality of through holes 72 and a lower barrel portion 67. A mounting hole 73 for connection is provided.

  Next, a procedure for forming a long molded body using the extruder 60 will be described.

  First, ceramic powder, a binder, and water are mixed and kneaded to form a clay-like clay. Then, the clay is introduced from the inlet 62 of the extrusion molding machine 61, and the two upper screws 64 so that the clay is caught between the upper screws 64 installed in parallel in the upper barrel portion 63. Are reversely rotated, the introduced clay is pushed out to the vacuum chamber 66 through the gap between the blade 64b and the inner wall of the upper barrel portion 63. The clay pushed out to the vacuum chamber 66 is decompressed by a vacuum pump connected to the vacuum chamber 66 and discharges bubbles inside the clay. Thereafter, the dredged material passes through the gap between the blade 68b and the inner wall of the lower barrel portion 67 by the rotation of the lower screw 68, and passes through the plurality of through holes 72 of the breaker plate 65, so that the dredged material is divided into gold. When the clay is pushed in the direction of the mold 69 and the clay passes through the mold 69, a long molded body having a specific cross-sectional shape is obtained. And a long ceramic product is obtained by drying and baking this long molded object.

  In such a long ceramic product, it is necessary not to cause cracks or bends during shrinkage in the drying or firing process, and the breaker plate 65 is a clay produced by the rotation of the lower screw 68. It plays an important role in eliminating twisting of the mold and making the amount of clay supplied to the mold 69 uniform, and the thickness of the breaker plate 65 is increased in order to change the diameter of the through-hole 72 and increase resistance. Studies such as increasing the thickness have been made.

  For example, Patent Document 1 proposes a method for continuously forming ceramic clay using an auger type continuous extrusion molding machine, and a screw groove of the extruder is provided between the clay supply screw and the forming die. It describes that a baffle plate (breaker plate) having inclined holes in the direction opposite to the direction is provided. According to this, by having the inclined hole in the direction opposite to the screw groove direction of the extruder, it is possible to completely eliminate the twisting of the clay in the rotational direction of the screw. A small number of sintered bodies can be obtained.

JP-A-5-253914

  However, the breaker plate described in Patent Document 1 can suppress the occurrence of cracks and bends due to the twisting of the clay in the rotational direction of the screw, but completely suppresses the occurrence of cracks. There wasn't. Therefore, it was necessary to further suppress the generation of cracks. Among the cracks that occur in the drying and firing processes of long shaped bodies, the following are caused by the cracks that occur in the surface of the dried body and sintered body that occur in the extrusion direction of the shaped body it is conceivable that. The clay pushed under high pressure is divided by the breaker plate, but the surface of each of the divided clays easily collects resin components and moisture that easily move in the clay. Then, the pressure is further pushed toward the mold, and the divided clays are joined again and pressed together, but the specific cross-sectional shape obtained by passing through the mold is reduced. In the rod-shaped or cylindrical molded body, the portion where the surfaces of the clay that easily collect resin and moisture are combined is continuously present in the extrusion direction. Therefore, the portion where the surfaces of the clay are joined together tends to have a low density, resulting in a density difference in the molded body, and when the resin component and moisture are shrunk due to heat received in the subsequent drying and firing processes. In particular, the surface of the molded body and the dried body receives the heat the fastest, and the resin component and moisture are removed violently, so that the surface of the dried body and the sintered body has cracks along the extrusion direction of the molded body. Conceivable.

  The present invention has been devised to solve the above-described problems, and cracks are generated on the surface of the dried body or sintered body along the extrusion direction of the molded body due to heat received in the drying or firing process of the molded body. An object of the present invention is to provide a breaker plate capable of suppressing this and an extrusion molding machine using the same.

More breaker plates of the present invention, there is provided a breaker plate having a plurality of through holes serving as the clay of the passage of the extrusion molding machine for producing a molded body by using the kneaded clay made of ceramic material, which is arranged on the outermost side At least a part of the through holes is a long hole extending along the outer shape of the molded body.

Further, the breaker plate of the present invention having the above structure, a contour is polygonal shape of the molded product, those prior SL slot is characterized that you have provided in parallel to the outer shape of the sides of the green body It is.

Moreover, the breaker plate of the present invention is characterized in that, in the above configuration, all of the plurality of through holes arranged on the outermost side are long holes.

Further, the breaker plate of the present invention, in the construction described above, the inside of the front SL slot, in which the through hole of the long hole extending along the long hole is characterized that you have been arranged .

Moreover, the breaker plate of the present invention is an elongated plate from the center of the region in which the plurality of through holes are provided on the surface of the clay inlet side to the outer peripheral side in any one of the configurations described above. The present invention is characterized in that a straight rectifying blade is provided.

Further, the breaker plate of the present invention having the above structure, the thickness of the rectifying blades is characterized in that it is thinner at the center side of the front Kigai periphery.

  The breaker plate according to the present invention is characterized in that, in the above-described configuration, a mesh member having an opening smaller than the through hole is provided so as to cover the inlet side of the clay of the plurality of through holes. is there.

  The extrusion molding machine of the present invention is characterized in that the breaker plate of the present invention having any one of the above configurations is installed between a screw and a mold.

According to the breaker plate of the present invention, it is a breaker plate having a plurality of through-holes serving as a clay passage of an extrusion molding machine for producing a molded body using a clay made of a ceramic raw material, and is disposed on the outermost side. In addition, since at least a part of the plurality of through holes is a long hole extending along the outer shape of the molded body, the surface of the molded body corresponding to the clay that has passed through the long hole has no Since there are fewer parts where the surfaces of the clay and the resin that are easy to move and the water that are likely to collect moisture than the conventional breaker plate with multiple through-holes, there is less risk of density differences. It is possible to suppress the occurrence of cracks along the extrusion direction of the molded body on the surface of the dried body or sintered body when the resin component or moisture is lost due to the heat received in the drying or firing process which is the process of Kill.

Further, in accordance with the breaker plate of the present invention, an outer shape polygonal shape of the molded body, the Rutoki before Symbol slot is provided in parallel to the outer shape of the sides of the molded body, the molded body polygonal Since there are less resin parts that can easily move through the clay and the surfaces of the clay that are likely to collect moisture, there is a possibility that density differences will occur on each surface. When the resin component and moisture are removed due to the heat received at, the shrinkage of the surface of the dried or sintered body along the extrusion direction of the molded body can be suppressed.

In addition, according to the breaker plate of the present invention, when all of the plurality of through holes arranged on the outermost side are long holes, a difference in density may occur on the surface corresponding to the side of the cross section of the outer shape of the molded body. As there are fewer resin parts that move easily through the clay and the surfaces where the surfaces of the clay that easily collect moisture are combined, the resin and moisture are affected by the heat received in the subsequent drying and firing processes. It is possible to further suppress the occurrence of cracks along the extruding direction of the molded body on the surface of the dried body or sintered body when the shrinkage occurs and shrinks.

Further, according to the breaker plates of the present invention, the inside of the front SL slot, the Rutoki have the through hole of the long hole extending along the long hole is disposed not only on the surface of the molded body, the molded body Even in the thickness direction of the inside, there are fewer parts where the surface of the clay that is easy to move in the clay and the moisture that tends to collect moisture, which may cause a density difference, is the subsequent process of drying. When the resin component and moisture are lost due to heat received in the firing process and shrink, the surface of the dried body or sintered body can be prevented from cracking along the extrusion direction of the molded body, It is possible to further reduce the possibility of cracks occurring inside the body and the sintered body.

Further, according to the breaker plate of the present invention, the elongated plate-like rectifying blades are provided from the center of the region in which the plurality of through holes are provided toward the outer peripheral side on the surface of the breaker plate on the clay inlet side. In some cases, a long shaped product is obtained by temporarily dividing the clay to which the torsional stress is applied with a rectifying blade, and relaxing the torsional stress applied to the clay to thereby leave the torsional stress in the clay. In addition, it is possible to suppress the occurrence of cracks and bends in the long ceramic product obtained by drying and firing the compact.

Further, according to the breaker plate of the present invention, the thickness of the rectifying vanes, when thinner at the center side than the outer peripheral side, the thickness of the rectifying blades, thinner at the center side from the outer peripheral side of the breaker plate, i.e. By sharpening the rectifying blades on the center side of the breaker plate, the filling density of the clay is high and it becomes easier to split the clay pushed near the center of the breaker plate where the torsional stress is high. It is possible to further suppress the occurrence of cracks and bends by relaxing, and to produce a rectifying effect and increase the molding speed.

  Further, according to the breaker plate of the present invention, when a mesh member having an opening smaller than the through hole is provided so as to cover the inlet side of the clay of the plurality of through holes, the clay can be finely divided. The air bubbles in the clay are removed, and the mechanical strength of the long ceramic product obtained by drying and firing the obtained long molded body can be increased. In addition, since the foreign matter can be removed, cracks caused by the foreign matter and a decrease in mechanical strength can be prevented.

  And, according to the extrusion molding machine of the present invention, the breaker plate of the present invention is installed between the screw and the mold, so that the twisting of the clay caused by the rotation of the screw is eliminated, and the twisting of the clay is prevented. The occurrence of cracks and bends can be suppressed, and cracks along the extrusion direction of the molded body can be made difficult to occur on the surface of the dried or sintered body. It can be suitably used for forming when obtaining a ceramic part having a scale.

It is a schematic sectional drawing which shows an example of embodiment of the screw type extrusion molding machine which installed the breaker plate of this invention. It is a top view which shows an example of embodiment of the breaker plate of this invention. It is a top view which shows the other example of embodiment of the breaker plate of this invention. It is a top view which shows the other example of embodiment of the breaker plate of this invention. The other example of embodiment of the breaker plate of this invention is shown, (a) is a top view, (b) is sectional drawing in the A-A 'line in (a). The other example of embodiment of the breaker plate of this invention is shown, (a) is a top view, (b) is sectional drawing in the B-B 'line | wire in (a). The other example of embodiment of the breaker plate of this invention is shown, (a) is a top view, (b) is sectional drawing in the C-C 'line | wire in (a). The other example of embodiment of the breaker plate of this invention is shown, (a) is a top view, (b) is sectional drawing in the D-D 'line | wire in (a). It is a schematic sectional drawing which shows the conventional screw type extrusion molding machine. The conventional breaker plate is shown, (a) is a plan view, (b) is a cross-sectional view taken along line E-E 'in (a).

  Hereinafter, the example of embodiment of the extrusion machine which installed the breaker plate of this invention and the breaker plate of this invention is demonstrated.

  FIG. 1 is a schematic cross-sectional view showing an example of an embodiment of an extrusion molding machine of the present invention in which a breaker plate of the present invention is installed.

  The screw-type extruder 1 of the example shown in FIG. 1 includes an upper screw 4 (two in a direction perpendicular to the paper surface in FIG. 1) composed of two shafts 4 a and blades 4 b installed in parallel in the upper barrel portion 3. And a lower screw 8 including a shaft 8a and a blade 8b installed in the lower barrel portion 7. The upper stage screw 4 is connected and fixed to the upper stage bearing 10 on both sides, the lower stage screw 8 is connected and fixed to the lower stage bearing 11 with one side support, and the upper stage screw 4 and the lower stage screw 8 are connected to a power source (not shown). A vacuum chamber 6 is provided between the upper screw 4 and the lower screw 8, and a vacuum pump (not shown) for evacuating the inside of the extruder 1 is connected. Further, the clay inlet 2 is opened in a part of the upper barrel portion 3, and the breaker plate 5 and the die 9 of the present invention having a plurality of through holes 12 are connected to the outlet side of the lower barrel portion 7. The configuration is as follows.

  Next, a procedure for forming a long molded body using the extrusion molding machine 1 of the example shown in FIG. 1 will be described. First, ceramic powder, a binder, and water are mixed and kneaded to form a clay-like clay. And this clay is thrown in from the inlet 2 of the extrusion molding machine 1, and the two upper screws 4 so that a clay may be wound between the upper screws 4 installed in parallel in the upper barrel portion 3. Are reversely rotated, the introduced clay passes through the gap between the blade 4 b and the inner wall of the upper barrel portion 3 and is pushed out to the vacuum chamber 6. The clay pushed out to the vacuum chamber 6 is decompressed by a vacuum pump connected to the vacuum chamber 6 and discharges bubbles inside the clay. Thereafter, the dredged material passes through the gap between the blade 8b and the inner wall of the lower barrel part 7 by the rotation of the lower screw 8 and passes through the plurality of through holes 12 of the breaker plate 5, thereby dividing the dredged material into a gold mold. When the clay is pushed in the direction of the mold 9 and the clay passes through the mold 9, a long molded body having a specific cross-sectional shape is obtained. And a long ceramic product is obtained by drying and baking this molded object.

The breaker plate 5 having a plurality of through-holes 12 for passage of the kneaded clay made of the extruder 1 of the ceramic material of the structure, at least a portion of the plurality of through-holes arranged on the outermost side, the molded body It is important that it is a long hole extending along the outer shape.

  FIG. 2 is a plan view showing an example of the embodiment of the breaker plate of the present invention. The breaker plate 5 in the example shown in FIG. 2 is made of stainless steel, chrome steel, chrome molybdenum steel, nickel chrome steel, nickel chrome molybdenum steel, carbon tool steel, alloy tool steel, or the like, and has a plurality of penetrations serving as clay passages. A mounting hole 13 for connecting to the hole 12 and the lower barrel portion 7 is provided. In the breaker plate 5 of the present invention, as the plurality of through holes 12, in addition to the conventional round holes 12a, two elongated holes 12b whose opening shape is along the outer shape of the molded body are the outermost (FIG. 2). In FIG. Since the breaker plate 5 according to the present invention is installed between the lower screw 8 and the mold 9, the clay passes through the breaker plate 5 and is divided, and then is further subjected to pressure. In the molded body obtained by being pushed in the direction of the mold 9 and rejoining and pressure-bonded and passing through the mold 9, the surface of the molded body corresponding to the clay that has passed through the long holes 12b is Since there are fewer parts where the surface of the clay that easily collects the resin content and moisture easily collects than the conventional breaker plate with multiple through-holes, there is less risk of density differences. It is possible to suppress the occurrence of cracks along the extrusion direction of the molded body on the surface of the dried body or sintered body when the resin component or moisture is lost due to the heat received in the drying or firing process which is the process of Can .

  Further, the outer shape of the molded body is polygonal, and the opening shape of the through hole 12 arranged on the outermost side is parallel to the side of the cross section of the outer shape of the molded body, that is, when the cross section of the outer shape of the molded body is viewed. The long hole 12b is preferably parallel to the side in the cross section and parallel to the width direction with respect to the outer surface of the molded body.

  FIG. 3 is a plan view showing another example of the embodiment of the breaker plate of the present invention.

  The breaker plate 5 of the example shown in FIG. 3 is when the outer shape of the molded body is a square shape, and the side of the cross section of the outer shape of the molded body with the opening shape of the through-hole 12 arranged on the outermost side is the square shape. Is a long hole 12b. In the case of such long holes 12b, on each surface of the quadrangular shaped body, there is a possibility of causing a difference in density, that is, surfaces of the clay that easily move in the clay and the clay that easily collects moisture. When the resin part and moisture are shrunk due to the heat received in the subsequent drying and firing processes, the surface of the dried body and sintered body is along the extrusion direction of the molded body. It is possible to suppress the occurrence of cracks. In addition, although the case where the outer shape of the molded body is a quadrangular shape has been described here, the opening shape of the through hole 12 arranged on the outermost side is also a polygonal molded body with respect to other polygonal molded bodies. It goes without saying that the same effect as described above can be obtained if the long hole 12b is parallel to the side of the cross section of the outer shape.

  FIG. 4 is a plan view showing still another example of the embodiment of the breaker plate of the present invention.

  In the breaker plate 5 of the present invention, as shown in the example shown in FIG. 4, a long hole 12 b corresponding to the length over which the opening shape of the through hole 12 arranged on the outermost side extends over both ends of the cross section of the outer shape of the molded body. It is preferable that The opening shape of the through hole 12 is the length over both ends of the side of the cross section of the outer shape of the molded body, that is, the length over both ends of the side in the cross section when the cross section of the outer shape of the molded body is viewed. The figure which has each two long holes 12b with respect to each surface of a molded object by being the long holes 12b corresponding to the length from the one end of the width direction to the other end with respect to the surface of the external shape of 3. Compared with the breaker plate 5 of the example shown in FIG. Since there are fewer parts where the surfaces of the clay that easily collect water and moisture are combined, when the resin and moisture are shrunk due to heat received in the subsequent drying and firing processes, the dried body and sintered That cracks occur on the surface of the body along the extrusion direction of the molded body. It is possible to suppress in La.

  5A and 5B show still another example of the embodiment of the breaker plate of the present invention. FIG. 5A is a plan view, and FIG. 5B is a cross-sectional view taken along line A-A ′ in FIG. 5 and FIG. 5 and subsequent figures, a plurality of arrows arranged on the left and right sides of the breaker plate 5 indicate the flow direction of the clay with respect to the breaker plate 5.

  In the breaker plate 5 of the present invention, as in the example shown in FIG. 5, the opening shape of the through hole 12 disposed inside the long hole 12 b which is the through hole 12 disposed on the outermost side is disposed on the outermost side. A long hole 12b ′ along the opening shape of the long hole 12b is preferable. As a result, not only the surface of the molded body, but also the surfaces of the clay that easily move in the clay and moisture can easily collect in the thickness direction inside the molded body. Since the combined part is reduced, when the resin and moisture are shrunk due to the heat received in the subsequent drying and baking processes, the surface of the dried or sintered body is along the extrusion direction of the molded body. While suppressing the occurrence of cracks, it is possible to further reduce the possibility of cracks occurring inside the dried body and the sintered body.

  Further, as shown in FIG. 5 (b), the C surface processing is performed on the portions of the through holes 12 of the breaker plate 5 on the clay inlet side and outlet side so as to widen the opening and eliminate the catching by the corners. It is preferable. As a result, the clay that has passed through the gap between the blade 8b and the inner wall of the lower barrel portion 7 by the rotation of the lower screw 8 is smoothly introduced and divided into the breaker plate 5, and is smoothly discharged in the direction of the mold 9. can do. By smoothly introducing and discharging the clay, the flow of the clay is not hindered, the twist of the clay due to the rotation of the lower screw 8 is eliminated, and the rejoined clay is involved in bubbles. Can be reduced. Further, the C-surface machining is applied to the breaker plate 5 on the inlet side and the outlet side of the clay so that the power source connected to the lower screw 8 and each of the extruder 1 constituting the extrusion machine 1 are configured. Since it is less likely that an excessive load is applied to the members, the frequency of replacement of the power source and each member can be reduced, and the life of the extruder 1 itself can be extended.

  The extrusion molding machine 1 of the present invention in which the breaker plate 5 of the present invention having any one of the above configurations is installed between the lower screw 7 and the mold 9 eliminates the twist of the clay caused by the rotation of the lower screw 8. In addition, it is possible to suppress the occurrence of cracks and bends due to the twisting of the clay, and to make it difficult to generate cracks along the extrusion direction of the molded body on the surface of the dried or sintered body. And can be suitably used for forming a long cylindrical ceramic part.

  6A and 6B show still another example of the embodiment of the breaker plate of the present invention. FIG. 6A is a plan view, and FIG. 6B is a cross-sectional view taken along line B-B ′ in FIG.

As shown in the example shown in FIG. 6, the breaker plate 5 of the present invention is elongated from the center of the region where the plurality of through holes 12 are provided to the outer peripheral side on the surface of the breaker plate 5 on the clay inlet side. A plate-like rectifying blade 15 is preferably provided. Torsional stress is applied to the clay extruded through the gap between the blade 8b and the inner wall of the lower barrel portion 7 by the rotation of the lower screw 8 of the extrusion molding machine 1, and the obtained long length is obtained. When this torsional stress remains in the molded body, there is a possibility that cracks or bends may occur in the long molded body or a long ceramic product obtained by drying and firing the molded body. For this reason, before the clay to which the torsional stress is applied enters the through-hole 12, the clay is temporarily divided by the rectifying blades 15 to relieve the torsional stress applied to the clay. It is possible to suppress the occurrence of cracks and bends in the long molded body due to the remaining torsional stress and in the long ceramic product obtained by drying and firing this molded body. The above-described effect can be obtained if the rectifying blade 15 is in the shape of a long and narrow plate, but in order to enhance the effect, it is preferable that the cross-sectional shape perpendicular to the length direction of the rectifying blade 15 is a triangle.

  Further, as the material of the rectifying blade 15, as with the breaker plate 5, stainless steel, chrome steel, chrome molybdenum steel, nickel chrome steel, nickel chrome molybdenum steel, carbon tool steel, alloy tool steel, etc. may be used.

  7A and 7B show still another example of the embodiment of the breaker plate of the present invention. FIG. 7A is a plan view, and FIG. 7B is a cross-sectional view taken along line C-C ′ in FIG.

  The breaker plate 5 of the present invention is an elongated plate-like shape provided on the surface of the breaker plate 5 on the inlet side of the clay from the center of the plurality of through holes 12 toward the outer peripheral side as in the example shown in FIG. The thickness of the straightening blade 15 is preferably thinner on the center side than on the outer peripheral side of the breaker plate 5. This is because the flow straightening blade 15 is thinner on the center side than the outer peripheral side of the breaker plate 5, that is, by sharpening the portion that first contacts the clay of the flow straightening blade 15 on the center side of the breaker plate 5, It becomes easy to divide the clay pushed to the vicinity of the center of the breaker plate 5 having a high filling density of the clay and high torsional stress, further reducing the torsional stress and further suppressing the occurrence of cracks and bending. In addition, the forming speed can be increased by producing a rectifying effect.

  8A and 8B show still another example of the embodiment of the breaker plate of the present invention. FIG. 8A is a plan view, and FIG. 8B is a cross-sectional view taken along line D-D ′ in FIG.

  As in the example shown in FIG. 8, the breaker plate 5 of the present invention is provided with a mesh member 16 having an opening smaller than the through hole 12 so as to cover the inlet side of the clay of the plurality of through holes 12. preferable. Thus, by providing the net-like member 16, the clay can be finely divided, so that bubbles in the clay are removed, and the long molded body obtained is dried and fired. The mechanical strength of the ceramic product can be increased. In addition, since the foreign matter can be removed, cracks caused by the foreign matter and a decrease in mechanical strength can be prevented.

  The material of the mesh member 16 may be a mesh member made of stainless steel, chromium steel, chromium molybdenum steel, nickel chromium steel, nickel chromium molybdenum steel, carbon tool steel, alloy tool steel, or the like. It is preferable to use 20 to 100 as the number.

  Next, an example of the manufacturing method of the breaker plate 5 of this invention is shown. Using stainless steel, chrome steel, chrome molybdenum steel, nickel chrome steel, nickel chrome molybdenum steel, carbon tool steel, alloy tool steel, etc., cut out to a predetermined shape and thickness, and drill multiple holes in the drilling machine. 12 round holes 12a, long holes 12b along the outer shape of the desired molded body, long holes 12b parallel to the sides of the outer shape of the molded body, and lengths across the sides of the outer shape of the molded body And the attachment holes 13 are formed. Furthermore, the breaker plate 5 of the present invention can be obtained by performing a screw process for connecting the attachment hole 13 to the lower barrel portion 7. Moreover, you may give C surface process to the part used as the entrance side and exit side of a clay with respect to the round hole 12a and the long hole 12b.

  As with the breaker plate 5, the rectifying blade 15 is cut out from the steel material of any one of the above materials so as to have a predetermined shape and thickness, and at least two rectifying blade attachment holes are provided for one of the rectifying blades 15. It can be obtained by threading to form 14. Then, a mounting hole (not shown) is formed at a predetermined position on the surface of the breaker plate 5 on the entrance side of the clay, and these mounting holes are combined and fastened using bolts or the like, so that the clay of the breaker plate 5 can be removed. An elongated plate-like rectifying blade 15 can be provided on the inlet side surface from the center of the plurality of through holes 12 toward the outer peripheral side. Furthermore, in order to make the thickness of the rectifying blade 15 thinner on the center side than on the outer peripheral side of the breaker plate 5, it may be processed so as to have a desired shape when cutting from the steel material.

  As for the mesh member 16, as in the case of the breaker plate 5 and the rectifying blade 15, a mesh member made of any of the above materials is prepared, and the mesh member 16 can cover the inlet side of the clay in the plurality of through holes 12. Then, the mesh member 16 is formed by drilling holes at the same positions as the attachment holes 13 (not shown) for connecting the rectifying blades 15 and the attachment holes 13 for connection to the lower barrel portion 7 formed in the breaker plate 5. Can be obtained. Then, a mesh member 16 is disposed so as to cover the inlet side of the clay of the plurality of through holes 12 of the breaker plate 5, and the rectifying blades 15 are disposed on the mesh member 16, and the attachment holes 13 and the rectifying blade attachment holes 14 are arranged. It can be connected by inserting a bolt or the like into the bolt and fastening it.

  The breaker plate 5 of the present invention thus obtained has passed through the long hole 12b because the opening shape of the through hole 12 arranged on the outermost side has the long hole 12b along the outer shape of the molded body. On the surface of the molded body corresponding to the clay, the portion where the surfaces of the clay that easily move in the clay and the water that easily collect moisture are combined with the conventional breaker plate with a plurality of through holes Compared to this, there is less risk of density differences on the surface of the molded body, and when the resin and moisture are shrunk due to heat received in the subsequent drying and firing processes, the dried body and sintered body It can suppress that a crack arises on the surface of this along the extrusion direction of a molded object.

  In addition, when the elongated plate-like rectifying blades 15 are provided on the surface of the breaker plate 5 on the inlet side of the clay from the center of the plurality of through holes 12 toward the outer peripheral side, the clay to which torsional stress is applied. Before entering the through-hole 12, the kneaded material is once divided by the rectifying blades 15 to relieve the torsional stress applied to the kneaded material. In addition, it is possible to suppress the occurrence of cracks and bends in the long ceramic product obtained by drying and firing the compact.

  Furthermore, when the thickness of the rectifying blade is thinner at the center side than the outer peripheral side of the breaker plate 5, the clay is pushed to the vicinity of the center of the breaker plate 5 where the filling density of the clay is high and the torsional stress is high. Can be more easily divided, and the torsional stress can be further relaxed to further suppress the occurrence of cracks and bends, and the forming speed can be increased by producing a rectifying effect.

  Further, when the mesh member 16 having an opening smaller than the through hole 12 is provided so as to cover the inlet side of the clay in the plurality of through holes 12, the clay can be finely divided, so that the bubbles in the clay Is removed, and the mechanical strength of the long ceramic product obtained by drying and firing the obtained long molded body can be increased. In addition, since the foreign matter can be removed, cracks caused by the foreign matter and a decrease in mechanical strength can be prevented.

  The extrusion molding machine 1 of the present invention in which the breaker plate 5 of the present invention having any one of the above configurations is installed between the lower screw 7 and the mold 9 eliminates the twist of the clay caused by the rotation of the lower screw 8. In addition, it is possible to suppress the occurrence of cracks and bends due to the twisting of the clay, and to make it difficult to generate cracks along the extrusion direction of the molded body on the surface of the dried or sintered body. And can be suitably used for forming a long cylindrical ceramic part.

  Examples of the present invention will be described below.

  First, a predetermined processing is performed on the stainless steel plate, the outer shape is a square of 500 mm, the thickness is 20 mm, four mounting holes 13 having a diameter of φ30 mm, 104 round holes 12 a having a diameter of φ25 mm, The breaker plate 5 of the example shown in FIG. 3 having a total of eight long holes 12b of 25 mm × 140 mm arranged on the outside was produced. Further, the outer shape is a square of 500 mm, the thickness is 20 mm, the four mounting holes 13 having a diameter of φ30 mm, the 104 round holes 12a having a diameter of φ25 mm, and the outermost 25 mm × 290 mm. The breaker plate 5 of the present invention having the four long holes 12b shown in FIG. 4 was produced. Furthermore, the outer shape is a square of 500 mm, the thickness is 20 mm, the four mounting holes 13 with a diameter of φ30 mm, the four long holes 12 b of 25 mm × 290 mm arranged on the outermost side, 25 mm × 230 mm, FIG. 5 has a long hole 12b ′ along the opening shape of four long holes 12b each of 25 mm × 170 mm, 25 mm × 110 mm, and 25 mm × 50 mm, and one round hole 12a having a diameter of 40 mm in the center. The breaker plate 5 of the present invention of the example shown was produced. In the example of the breaker plate 5 of the present invention shown in FIG. 5, as shown in the sectional view of FIG. 5 (b), it becomes the inlet side and the outlet side of the clay with respect to the round hole 12a and the long hole 12b. C surface processing was given to the part.

  Further, a predetermined grinding process is performed on the stainless steel plate, the outer shape is a square of 500 mm, the thickness is 20 mm, and there are four mounting holes having a diameter of φ30 mm and 143 through-holes having a diameter of φ25 mm. A conventional breaker plate having the shape shown in FIG. 7 was produced. And the produced breaker plate 5 of this invention and the conventional breaker plate were installed in each extrusion molding machine.

  Next, the dredged soil was prepared. First, an alumina primary material having a purity of 95% or more and an average particle diameter of 1 μm is prepared as a raw material for clay, and 100% by mass of the alumina primary material is composed of oxides of Ca, Si, and Mg. 1 to 5% by mass of the sintering aid to be obtained, 1 to 1.5% by mass of PVA as a binder, 100% by mass of water, and 0.5% by mass of the dispersing agent, and these are put into a kneader and kneaded. As a result, clay-like clay was obtained.

  The subsequent molding procedure will be described using reference numerals of members constituting the extrusion molding machine 1 of the present invention. The prepared clay was put in from the inlet 2 of each extrusion molding machine. The dredged clay is rotated in reverse so that the clay is wound between the upper screws 4 installed in parallel in the upper barrel portion 3 so that the gap between the blades 4b and the blade 4b and the upper It was pushed through a gap with the inner wall of the barrel portion 3 while being given a shearing force, and pushed out into the vacuum chamber 6.

  Next, the clay pushed out to the vacuum chamber 6 is decompressed by a vacuum pump connected to the vacuum chamber 6 to remove bubbles in the clay, and the clay that has passed through the vacuum chamber 6 is the lower barrel portion 7. It falls on the lower stage screw 8 in the inside and passes through the gap between the blades 8b and the gap between the blade 8b and the inner wall of the lower barrel part 7 by the rotation of the lower stage screw 8, and by the breaker plate 5 of the present invention or the conventional breaker plate. By being pushed in the direction of the mold 9 in a divided form and passing through the mold 9, the outer side is a 160 mm square, and one side of the hollow part is a 125 mm square cross-sectional shape, and the length is Thirty 2.5 m cylindrical molded bodies were formed.

  And after drying this molded object for 48 hours at 100 degreeC, it was confirmed whether the crack of the surface of a dried object had arisen. Next, after placing in a large firing furnace and firing at a maximum temperature of 1500 to 1700 ° C. in an air atmosphere, it was confirmed whether or not cracks had occurred on the surface of the sintered body.

  As a result, with regard to a dried body obtained by drying a cylindrical molded body produced by using an extruder equipped with a conventional breaker plate and a sintered body obtained by firing the cylindrical molded body, 9 out of 30 molded bodies were formed. Cracks that occurred along the extrusion direction were confirmed.

  On the other hand, about the dry body which dried the cylindrical molded object produced using the extrusion molding machine 1 which installed the breaker plate 5 of the example of this invention shown in FIG. 3, and the sintered compact which baked this, One minute crack generated along the extrusion direction of the molded body was confirmed. Moreover, about the dry body which dried the cylindrical molded object produced using the extrusion molding machine 1 which installed the breaker plate 5 of this invention of the example shown in FIG.4 and FIG.5, and the sintered compact which baked this The occurrence of cracks was not confirmed.

  Thereby, it turned out that it is hard to produce the crack along the extrusion direction of a molded object by arrange | positioning the long hole 12b along the external shape of a molded object on the outermost side. Further, it has been found that by arranging the long holes 12b corresponding to the lengths extending across both ends of the cross section of the outer shape of the molded body on the outermost side, cracks along the extrusion direction of the molded body can be hardly generated.

  Further, when the load applied to the power source to which the lower screw 8 is connected was confirmed with a pressure gauge at the time of molding in this example, the breaker plate 5 of the present invention subjected to the C-surface processing of the example shown in FIG. The installed extrusion molding machine 1 had the lowest load. From this result, since the C surface processing is applied to the portions of the round holes 12a and the long holes 12b on the inlet side and the outlet side of the clay, an excessive load is applied to the power source to which the lower screw 8 is connected. This also means that no excessive load is applied to each member constituting the extrusion molding machine 1, so that the life of the power source and each member can be extended, and the replacement frequency is reduced. It was found that the life of the extruder 1 itself can be extended.

  Next, the breaker plate 5 of the present invention provided with the rectifying member 15 and the mesh member 16 shown in Table 1 was prepared, and a test for investigating the three-point bending strength and void ratio of the sintered body was performed. In order to confirm the effect of the rectifying blades 15, the molding speed was measured at the time of extrusion molding.

  First, the breaker plate shown in FIG. 5 is manufactured by the same method as in the first embodiment, and holes are drilled at predetermined positions on the surface on the inlet side of the clay to connect the rectifying blades 15. A mounting hole was formed.

  Next, the rectifying blade 15 was produced. Using stainless steel, eight rectifying vanes 15A having a length of 200 mm, a height of 30 mm, a thickness of 15 mm, and a triangular cross-section perpendicular to the length direction were cut out. In addition, using stainless steel, the length, height, and the cross-sectional shape perpendicular to the length direction are similarly triangular, and one thickness in the length direction is 15 mm, and the other thickness is 7 mm. 8 rectifying blades 15B were cut out. Then, each of the rectifying blades 15 is threaded to form two rectifying blade attachment holes 14 having a diameter of 5 mm per one of the rectifying blades 15. Eight rectifying blades 15B having different thicknesses were obtained.

  Next, a mesh member 16 was produced. Made of stainless steel, prepare a mesh-like member with a count of 40 and machine it into a square with an outer shape of 500 mm. Four pieces with a diameter of φ30 mm for connection to the lower barrel portion 7 formed on the breaker plate 5 Hole processing was performed at the same position as a mounting hole (not shown) for connecting the mounting hole 13 and the rectifying blade 15 to obtain two mesh members 16.

  And the breaker plate 5 of this invention of the structure shown in Table 1 was produced. The rectifying blades 15 were arranged so that the rectifying blade mounting holes 14 were fitted to mounting holes (not shown) at predetermined positions on the surface of the breaker plate 5 on the inlet side of the clay, and were fastened using bolts. Further, for the mesh member 16, the mesh member 16 is disposed so as to cover the inlet side of the clay of the plurality of through holes 12 of the breaker plate 5, and the rectifying blades 15 are disposed on the mesh member 16 to attach the mesh members 16. The bolts were connected to the rectifying blade mounting holes 14 by inserting bolts and fastening them. Then, each produced breaker plate 5 was installed in each extruder 1 similarly to Example 1. FIG. And the same clay as Example 1 was prepared, this clay was thrown into each extrusion molding machine 1, and the long compact was produced. At this time, the molding speed (distance traveled in the extrusion direction in 1 minute) of each extruder 1 was measured. Next, after drying and baking the obtained long molded object, required processing was performed and the 3 point | piece bending strength was measured based on JISR1601-1995. Separately, a test piece was cut out from the sintered body and the surface was mirror-finished, and then observed with an image analyzer (LUZEX-FS manufactured by Nireco Corporation) at a magnification of 100 times. The void ratio (%) was calculated. The results are shown in Table 1.

  As a result, sample No. The three-point bending strength of the sintered body extruded by using the breaker plate 5 of the present invention in which the rectifying blade 15 of 1 was not provided was 332 MPa. The three-point bending strength of the sintered body extruded by using the breaker plate 5 of the present invention provided with 2 to 5 rectifying blades 15 is 340 MPa or more. It was found that the micro-cracks generated in the sintered body can be suppressed by relaxing the torsional stress.

  Sample No. 2 and sample no. 3, Sample No. 4 and sample no. 5 are compared with each other, sample No. 3 and sample no. Since the molding speed of No. 5 is increased, it has been found that the rectifying effect can be enhanced by making the thickness of the rectifying blade 15 thinner on the center side than on the outer peripheral side of the breaker plate 5.

  Sample No. 1 had a void fraction of 3.1%, whereas sample no. The void ratio of 2 and 3 was 2.9%, and it was found that the void ratio could be improved by providing the rectifying blade 15. Furthermore, sample no. The void ratio of 4 and 5 was 1.2%, and it was found that the void ratio could be greatly improved by providing the mesh member 16. Sample No. Nos. 4 and 5 have a three-point bending strength of 362 MPa. By providing the rectifying blade 15 and the mesh member 16, the mechanical strength is enhanced by the synergistic effect by removing the air bubbles and foreign matter in the clay. I found out that

1: Extruder 2: Input port 3: Upper barrel 4: Upper screw 4a: Shaft 4b: Blade 5: Breaker plate 6: Vacuum chamber 7: Lower barrel 8: Lower screw 8a: Shaft 8b: Blade 9: Mold
10: Upper bearing
11: Lower stage bearing
12: Through hole
12a: Round hole
12b, 12b ': Long hole
13: Mounting hole
14: Rectifier blade mounting hole
15: Rectifier blade
16: Mesh member

Claims (8)

A breaker plate having a plurality of through-holes serving as a clay passage of an extruder for producing a molded body using a clay made of ceramic raw material, and at least of the plurality of through-holes arranged on the outermost side A breaker plate characterized in that a part thereof is a long hole extending along the outer shape of the molded body. The external shape of the molded body is polygonal, breaker plate according to claim 1 before Symbol slot is characterized that you have provided in parallel to the outer shape of the sides of the molded body. The breaker plate according to claim 1 or 2, wherein all of the plurality of through holes arranged on the outermost side are long holes. Inside the front Symbol slots, breaker plate according to any of claims 1 to 3 wherein the through hole of the long hole extending along the long hole is characterized that you have been placed. 2. An elongated plate-like rectifying blade is provided on the surface of the breaker plate on the inlet side of the clay from the center of the region where the plurality of through holes are provided toward the outer peripheral side. The breaker plate according to claim 4. Breaker plate according to claim 5 in which the thickness of the rectifying vanes, characterized in that the thinner in front Kigai circumferential side center side than.   The breaker plate according to claim 5, wherein a net-like member having an opening smaller than the through hole is provided so as to cover an inlet side of the clay of the plurality of through holes.   An extrusion molding machine, wherein the breaker plate according to any one of claims 1 to 7 is installed between a screw and a mold.

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