JP2013193278A - Extrusion molding device and method of manufacturing molding using the same - Google Patents

Extrusion molding device and method of manufacturing molding using the same Download PDF

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Publication number
JP2013193278A
JP2013193278A JP2012060975A JP2012060975A JP2013193278A JP 2013193278 A JP2013193278 A JP 2013193278A JP 2012060975 A JP2012060975 A JP 2012060975A JP 2012060975 A JP2012060975 A JP 2012060975A JP 2013193278 A JP2013193278 A JP 2013193278A
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resistance
raw material
die
material composition
molded body
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Teruo Komori
照夫 小森
Kazuya Tsuchimoto
和也 土本
Asa Yoshino
朝 吉野
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Sumitomo Chemical Co Ltd
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Sumitomo Chemical Co Ltd
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Priority to JP2012060975A priority Critical patent/JP2013193278A/en
Priority to PCT/JP2013/057077 priority patent/WO2013137346A1/en
Publication of JP2013193278A publication Critical patent/JP2013193278A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/26—Extrusion dies
    • B28B3/2672—Means for adjusting the flow inside the die, e.g. using choke means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/206—Forcing the material through screens or slots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/26—Extrusion dies
    • B28B3/2654—Means for heating or cooling the die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/362—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using static mixing devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/38—Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in the same barrel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/385—Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in separate barrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/67—Screws having incorporated mixing devices not provided for in groups B29C48/52 - B29C48/66
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
    • B29C48/865—Heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
    • B29C48/87—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/695—Flow dividers, e.g. breaker plates
    • B29C48/70—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows
    • B29C48/705—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows in the die zone, e.g. to create flow homogeneity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Abstract

PROBLEM TO BE SOLVED: To efficiently manufacture a molding sufficiently small in curvature and high in dimensional accuracy.SOLUTION: An extrusion molding device includes a flow passage feeding a paste raw material composition, a screw disposed upstream of the flow passage and kneading and feeding the raw material composition to the downstream side, a die which is disposed downstream of the flow passage and from which a molding consisting of the raw material composition is extruded, a rectifier disposed between the screw and the die and having a plurality of openings pierced in a thickness direction, a resistance tube communicating the downstream side of the rectifier with the die, a plurality of resistance pins disposed to pass through a tube wall of the resistance tube and individually changeable in length protruding into the resistance tube, and a means for adjusting temperatures of the plurality of resistance pins.

Description

本発明は、成形体の製造技術に関するものであり、より詳細にはセラミックス成形体を製造するための押出成形装置及びこれを用いた成形体の製造方法に関する。   The present invention relates to a technique for manufacturing a molded body, and more particularly to an extrusion molding apparatus for manufacturing a ceramic molded body and a method for manufacturing a molded body using the same.

従来より、ハニカムフィルタ構造体が、ＤＰＦ（Diesel particulate filter）用等として広く知られている。このハニカムフィルタ構造体は、多数の貫通孔を有するハニカム構造体の一部の貫通孔の一端側を封口材で封じると共に、残りの貫通孔の他端側を封口材で封じた構造を有する。特許文献１，２には、ハニカム構造体の製造に使用されるダイス及び押出成形装置が開示されている。   Conventionally, honeycomb filter structures are widely known for DPF (Diesel particulate filter) and the like. This honeycomb filter structure has a structure in which one end side of some through holes of a honeycomb structure having a large number of through holes is sealed with a sealing material, and the other end side of the remaining through holes is sealed with a sealing material. Patent Documents 1 and 2 disclose a die and an extrusion molding apparatus used for manufacturing a honeycomb structure.

特開昭６１−５９１５号公報JP 61-5915 A 特許第４０９９８９６号公報Japanese Patent No. 4099896

ところで、ＤＰＦ用のハニカムフィルタ構造体は一般に剛性を有するケースに収容された状態で使用される。ハニカムフィルタ構造体の寸法精度が低いと熱応力等によってハニカムフィルタ構造体に亀裂が入るなどの不具合が生じやすくなる。そのため、焼成前のグリーン成形体に対して高い寸法精度が要求される。また、ハニカム構造体は、狭いセルピッチ（例えば１．１〜２．８ｍｍ程度）を有するものもあり、多数の貫通孔を画成する隔壁の厚さについても高い寸法精度が要求される。   By the way, the honeycomb filter structure for DPF is generally used in a state of being housed in a rigid case. If the dimensional accuracy of the honeycomb filter structure is low, problems such as cracks in the honeycomb filter structure due to thermal stress or the like are likely to occur. Therefore, high dimensional accuracy is required for the green molded body before firing. Some honeycomb structures have a narrow cell pitch (for example, about 1.1 to 2.8 mm), and a high dimensional accuracy is required for the thickness of the partition walls defining a large number of through holes.

押出成形装置でグリーン成形体を製造する際、ダイの上流側の面に到達する原料組成物の流速が不均一で特定領域の原料組成物の流速が他の領域と比較して高いと、湾曲した成形体がダイから押し出される。これを後から真っ直ぐに矯正しようとすると、成形体の隔壁が湾曲したり外面にクラックが入ったりするといった不具合が生じる。また、成形体の製造を開始した初期の段階では真っ直ぐなものが得られていても、ダイの摩耗などによって成形体の曲がりが徐々に顕著となる場合がある。   When manufacturing a green molded body with an extrusion molding device, the flow rate of the raw material composition reaching the upstream surface of the die is uneven and the flow rate of the raw material composition in a specific region is high compared to other regions. The formed body is extruded from the die. If this is to be corrected straight afterwards, there arises a problem that the partition walls of the molded body are curved or cracks are formed on the outer surface. Further, even if a straight product is obtained at the initial stage when the production of the molded body is started, the bending of the molded body may become gradually noticeable due to die wear or the like.

本発明は、上記課題に鑑みてなされたものであり、曲がりが十分に小さく、寸法精度が高い成形体を効率的に製造できる押出成形装置及びこれを用いた成形体の製造方法を提供することを目的とする。   The present invention has been made in view of the above problems, and provides an extrusion molding apparatus capable of efficiently producing a molded body with sufficiently small bending and high dimensional accuracy, and a method for producing a molded body using the same. With the goal.

本発明に係る押出成形装置は、ペースト状の原料組成物を移送する流路と、流路の上流側に設けられ、原料組成物を混練すると共に下流側へと移送するスクリューと、流路の下流側に設けられ、原料組成物からなる成形体が押し出されるダイと、スクリューとダイの間に設けられ、厚さ方向に貫通する複数の開口を有する整流板と、整流板の下流側とダイを連通する抵抗管と、抵抗管の管壁を貫通するように設けられ、抵抗管の内側に突出する長さがそれぞれ変更自在の複数の抵抗ピンと、複数の抵抗ピンの温度を調整する手段とを備える。   The extrusion molding apparatus according to the present invention includes a flow path for transferring a paste-like raw material composition, a screw provided on the upstream side of the flow path, kneading the raw material composition and transferring it downstream, and a flow path A die provided on the downstream side from which a molded body made of the raw material composition is extruded, a rectifying plate provided between the screw and the die and having a plurality of openings penetrating in the thickness direction, and a downstream side of the rectifying plate and the die A resistance tube that communicates with the resistance tube, a plurality of resistance pins that are provided so as to penetrate through the tube wall of the resistance tube, and the lengths that protrude inside the resistance tube can be changed, respectively, and a means for adjusting the temperature of the plurality of resistance pins Is provided.

本発明の押出成形装置が備える複数の抵抗ピンは、ダイに導入される原料組成物の流速分布の均一化を図るためのものである。押し出されてくる成形体の曲がりの程度及び方向をチェックし、要求精度を超える曲がりが認められる場合、複数の抵抗ピンの突出長さをそれぞれ調節することによって曲がりが十分に小さく、寸法精度が高い成形体を効率的に製造できる。   The plurality of resistance pins provided in the extrusion molding apparatus of the present invention is for uniformizing the flow velocity distribution of the raw material composition introduced into the die. Check the degree and direction of the bending of the extruded product, and if bending exceeding the required accuracy is observed, adjusting the protruding lengths of multiple resistance pins makes the bending sufficiently small and the dimensional accuracy is high. A molded object can be manufactured efficiently.

複数の抵抗ピンの温度を調整する手段は、抵抗ピンの突出長さを調節する際に抵抗ピンとペースト状の原料組成物との間の摩擦を低減して当該操作を円滑に行うためのものである。抵抗ピンの温度を調整する手段の具体例としては、冷熱媒体循環ジャケット、電気式冷却機、電気式加熱機又はこれらの組合せが挙げられる。   The means for adjusting the temperature of the plurality of resistance pins is to reduce the friction between the resistance pins and the paste-like raw material composition when adjusting the protruding length of the resistance pins, thereby smoothly performing the operation. is there. Specific examples of the means for adjusting the temperature of the resistance pin include a cooling medium circulation jacket, an electric cooler, an electric heater, or a combination thereof.

本発明は、上記押出成形装置を用いた成形体の製造方法であり、温度調整された抵抗ピンの突出長さを変更する工程を備えた方法を提供する。本発明の方法によれば、抵抗ピンの突出長さを適宜調節することで、曲がりが十分に小さく、寸法精度が高い成形体を効率的に製造できる。抵抗ピンの温度を適した範囲に調整することにより、抵抗ピンの突出長さを調節する際に抵抗ピンとペースト状の原料組成物との間の摩擦を低減でき、当該操作を円滑に行うことができる。   This invention is a manufacturing method of the molded object using the said extrusion molding apparatus, and provides the method provided with the process of changing the protrusion length of the resistance pin by which temperature adjustment was carried out. According to the method of the present invention, by appropriately adjusting the protruding length of the resistance pin, it is possible to efficiently produce a molded body with sufficiently small bending and high dimensional accuracy. By adjusting the temperature of the resistance pin to a suitable range, the friction between the resistance pin and the paste-like raw material composition can be reduced when adjusting the protruding length of the resistance pin, and the operation can be performed smoothly. it can.

本発明によれば、曲がりが十分に小さく、寸法精度が高い成形体を効率的に製造できる。   According to the present invention, it is possible to efficiently produce a molded body with sufficiently small bending and high dimensional accuracy.

（ａ）はハニカム構造体用グリーン成形体の一例を示す斜視図、（ｂ）はグリーン成形体の部分拡大図である。(A) is a perspective view which shows an example of the green molded object for honeycomb structures, (b) is the elements on larger scale of a green molded object. 本発明に係る押出成形装置の実施形態を示す概略断面図である。It is a schematic sectional drawing which shows embodiment of the extrusion molding apparatus which concerns on this invention. 図１に示す抵抗管及びその管壁を貫通するように設けられた抵抗ピンの構成を示す部分断面図である。It is a fragmentary sectional view which shows the structure of the resistance pin provided so that the resistance tube shown in FIG. 1 and its tube wall might be penetrated. 整流板の構成を示す図である。It is a figure which shows the structure of a baffle plate. 抵抗管の内側に複数の抵抗ピンの先端側が突出している様子を示す断面図である。It is sectional drawing which shows a mode that the front end side of a some resistance pin has protruded inside the resistance tube. 抵抗管の内側に複数の抵抗ピンの先端側が突出している様子を示す断面図である。It is sectional drawing which shows a mode that the front end side of a some resistance pin has protruded inside the resistance tube. 抵抗ピンの内部の構造を模式的に示す断面図である。It is sectional drawing which shows typically the structure inside a resistance pin. 本発明に係る押出成形装置の他の実施形態であって抵抗管の下流側に延長管（直管部）を備えた形態を示す部分断面図である。It is other embodiment of the extrusion molding apparatus which concerns on this invention, and is a fragmentary sectional view which shows the form provided with the extension pipe (straight pipe part) in the downstream of the resistance pipe. 本発明に係る押出成形装置の他の実施形態であって抵抗ピンの突出長さを自動制御する機構を備えた形態を示す構成図である。It is a block diagram which shows the form provided with the mechanism which is other embodiment of the extrusion molding apparatus which concerns on this invention, and automatically controls the protrusion length of a resistance pin. 非接触式変位センサによって成形体の曲がりを検出する機構の一例を示す模式図である。It is a schematic diagram which shows an example of the mechanism which detects the bending of a molded object with a non-contact-type displacement sensor. 非接触式寸法測定器によって成形体の曲がりを検出する機構の一例を示す模式図である。It is a schematic diagram which shows an example of the mechanism which detects the bending of a molded object with a non-contact-type dimension measuring device. グリーン成形体の他の例を示す図である。It is a figure which shows the other example of a green molded object.

以下、図面を参照しながら、本発明の好適な実施形態について詳細に説明する。まず、本発明に係る押出成形装置の説明に先立ち、ハニカム構造体用のグリーン成形体について説明する。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. First, prior to description of the extrusion molding apparatus according to the present invention, a green molded body for a honeycomb structure will be described.

＜グリーン成形体＞
図１に示すグリーン成形体７０は、原料組成物を押出成形することによって得られたものである。図１の（ａ）に示すように、グリーン成形体７０は多数の貫通孔７０ａが略平行に配置された円柱体である。貫通孔７０ａの断面形状は、図１の（ｂ）に示すように正方形である。これらの複数の貫通孔７０ａは、グリーン成形体７０において、端面から見て、正方形配置、すなわち、貫通孔７０ａの中心軸が、正方形の頂点にそれぞれ位置するように配置されている。貫通孔７０ａの断面の正方形のサイズは、例えば、一辺０．８〜２．５ｍｍとすることができる。なお、グリーン成形体７０を所定の温度で焼成することによってハニカム構造体が製造される。 <Green molded body>
A green molded body 70 shown in FIG. 1 is obtained by extruding a raw material composition. As shown in FIG. 1A, the green molded body 70 is a cylindrical body in which a large number of through holes 70a are arranged substantially in parallel. The cross-sectional shape of the through hole 70a is a square as shown in FIG. The plurality of through holes 70a are arranged in a square arrangement in the green molded body 70, that is, such that the central axis of the through hole 70a is located at the apex of the square. The square size of the cross section of the through hole 70a can be set to 0.8 to 2.5 mm on a side, for example. A honeycomb structure is manufactured by firing the green molded body 70 at a predetermined temperature.

グリーン成形体７０の貫通孔７０ａが延びる方向の長さは特に限定されないが、例えば、４０〜３５０ｍｍとすることができる。また、グリーン成形体７０の外径も特に限定されないが、例えば、１００〜３２０ｍｍとすることできる。   The length of the green molded body 70 in the direction in which the through hole 70a extends is not particularly limited, but may be 40 to 350 mm, for example. Moreover, although the outer diameter of the green molded object 70 is not specifically limited, For example, it can be set as 100-320 mm.

グリーン成形体７０をなす原料組成物は特に限定されないが、ＤＰＦ用のハニカム構造体を製造する場合にあっては、セラミクス原料である無機化合物源粉末、及び、メチルセルロース等の有機バインダ、及び、必要に応じて添加される添加剤を含む。ハニカム構造体の高温耐性の観点から、好適なセラミクス材料として、アルミナ、シリカ、ムライト、コーディエライト、ガラス、チタン酸アルミニウム等の酸化物、シリコンカーバイド、窒化珪素等が挙げられる。なお、チタン酸アルミニウムは、更に、マグネシウム及び／又はケイ素を含むことができる。   The raw material composition forming the green molded body 70 is not particularly limited. However, when manufacturing a honeycomb structure for DPF, an inorganic compound source powder that is a ceramic raw material, an organic binder such as methylcellulose, and necessary Additives added depending on From the viewpoint of high temperature resistance of the honeycomb structure, suitable ceramic materials include alumina, silica, mullite, cordierite, glass, oxides such as aluminum titanate, silicon carbide, silicon nitride, and the like. The aluminum titanate can further contain magnesium and / or silicon.

例えば、チタン酸アルミニウムのグリーン成形体を製造する場合、無機化合物源粉末は、αアルミナ粉等のアルミニウム源粉末、及び、アナターゼ型やルチル型のチタニア粉末等のチタニウム源粉末を含み、必要に応じて、更に、マグネシア粉末やマグネシアスピネル粉末等のマグネシウム源粉末及び／又は、酸化ケイ素粉末やガラスフリット等のケイ素源粉末を含むことができる。   For example, when producing a green molded body of aluminum titanate, the inorganic compound source powder includes an aluminum source powder such as α-alumina powder and a titanium source powder such as anatase type or rutile type titania powder. Furthermore, magnesium source powders such as magnesia powder and magnesia spinel powder and / or silicon source powders such as silicon oxide powder and glass frit can be included.

有機バインダとしては、メチルセルロース、カルボキシルメチルセルロース、ヒドロキシアルキルメチルセルロース、ナトリウムカルボキシルメチルセルロースなどのセルロース類；ポリビニルアルコールなどのアルコール類；リグニンスルホン酸塩が挙げられる。   Examples of the organic binder include celluloses such as methylcellulose, carboxymethylcellulose, hydroxyalkylmethylcellulose, and sodium carboxymethylcellulose; alcohols such as polyvinyl alcohol; and lignin sulfonate.

添加物としては、例えば、造孔剤、潤滑剤及び可塑剤、分散剤、溶媒が挙げられる。   Examples of the additive include a pore former, a lubricant and a plasticizer, a dispersant, and a solvent.

造孔剤としては、グラファイト等の炭素材；ポリエチレン、ポリプロピレン、ポリメタクリル酸メチル等の樹脂類；でんぷん、ナッツ殻、クルミ殻、コーンなどの植物材料；氷；及びドライアイス等などが挙げられる。   Examples of the pore-forming agent include carbon materials such as graphite; resins such as polyethylene, polypropylene, and polymethyl methacrylate; plant materials such as starch, nut shells, walnut shells, and corn; ice; and dry ice.

潤滑剤及び可塑剤としては、グリセリンなどのアルコール類；カプリル酸、ラウリン酸、パルミチン酸、アラキジン酸、オレイン酸、ステアリン酸などの高級脂肪酸；ステアリン酸Ａｌなどのステアリン酸金属塩、ポリオキシアルキレンアルキルエーテル（ＰＯＡＡＥ）などが挙げられる。   Lubricants and plasticizers include alcohols such as glycerin; higher fatty acids such as caprylic acid, lauric acid, palmitic acid, arachidic acid, oleic acid and stearic acid; metal stearates such as Al stearate, polyoxyalkylene alkyl And ether (POAAE).

分散剤としては、例えば、硝酸、塩酸、硫酸などの無機酸；シュウ酸、クエン酸、酢酸、リンゴ酸、乳酸などの有機酸；メタノール、エタノール、プロパノールなどのアルコール類；ポリカルボン酸アンモニウム、ポリオキシアルキレンアルキルエーテルなどの界面活性剤などが挙げられる。   Examples of the dispersant include inorganic acids such as nitric acid, hydrochloric acid, and sulfuric acid; organic acids such as oxalic acid, citric acid, acetic acid, malic acid, and lactic acid; alcohols such as methanol, ethanol, and propanol; ammonium polycarboxylate; Surfactants such as oxyalkylene alkyl ethers are listed.

溶媒としては、例えば、メタノール、エタノール、ブタノール、プロパノールなどのアルコール類；プロピレングリコール、ポリプロピレングリコール、エチレングリコールなどのグリコール類；及び水などを用いることができる。   As the solvent, for example, alcohols such as methanol, ethanol, butanol and propanol; glycols such as propylene glycol, polypropylene glycol and ethylene glycol; and water can be used.

＜押出成形装置＞
図２〜７を参照しながら、本発明に係る押出成形装置の好適な実施形態について説明する。図２に示す押出成形装置１０は、粉末状又はペースト状の原料組成物からグリーン成形体７０を製造するためのものである。 <Extrusion molding equipment>
A preferred embodiment of an extrusion molding apparatus according to the present invention will be described with reference to FIGS. The extrusion molding apparatus 10 shown in FIG. 2 is for producing a green molded body 70 from a powdery or pasty raw material composition.

押出成形装置１０は、ハウジング１内の上段に設けられたスクリュー２Ａ及び下段に設けられたスクリュー２Ｂを備える。スクリュー２Ａ，２Ｂは、入口１ａから供給された原料組成物を混練すると共に流路１ｂを通じて下流側へと移送するためのものである。スクリュー２Ａ，２Ｂの間には、真空室３が設けられており、真空室３内を減圧することによって原料組成物を脱気処理できるようになっている。真空室３内の原料組成物はローラ３ａによって下段のスクリュー２Ｂに導入される。   The extrusion molding apparatus 10 includes a screw 2A provided at the upper stage in the housing 1 and a screw 2B provided at the lower stage. The screws 2A and 2B are for kneading the raw material composition supplied from the inlet 1a and transferring it downstream through the flow path 1b. A vacuum chamber 3 is provided between the screws 2A and 2B, and the raw material composition can be degassed by reducing the pressure in the vacuum chamber 3. The raw material composition in the vacuum chamber 3 is introduced into the lower screw 2B by a roller 3a.

押出成形装置１０は、スクリュー２Ｂの下流側に設けられた整流板５と、原料組成物からなる成形体７０Ａが押し出されるダイ８と、流路１ｂとダイ８を連通する抵抗管９と、抵抗管９の管壁を貫通するように設けられ、抵抗管９の内側に突出する長さがそれぞれ変更自在の１６本の抵抗ピンＰとを更に備える（図３，５参照）。抵抗管９は、内部の流路がテーパ状になっており、上流側から下流側に向けて流路断面積が徐々に小さくなっている。なお、スクリュー２Ｂの径よりも径が大きい成形体７０Ａを製造する場合などには、抵抗管９は上流から下流に向けて流路断面が大きくなる拡大部を有してもよい。ダイ８から押し出された成形体７０Ａが変形しないように、押出成形装置１０の隣には成形体７０Ａを支持するための支持台１５が設置されている。整流板５及び複数の抵抗ピンＰは、ダイ８に原料組成物を導入するに先立ち、その流速分布の均一化を図るためのものである。   The extrusion molding apparatus 10 includes a rectifying plate 5 provided on the downstream side of the screw 2B, a die 8 from which a molded body 70A made of a raw material composition is extruded, a resistance tube 9 that communicates the flow path 1b and the die 8, and a resistance. It further includes 16 resistance pins P which are provided so as to penetrate the tube wall of the tube 9 and whose lengths protrude inside the resistance tube 9 can be changed (see FIGS. 3 and 5). The resistance tube 9 has a tapered inner flow path, and the flow path cross-sectional area gradually decreases from the upstream side toward the downstream side. In addition, when manufacturing the molded object 70A whose diameter is larger than the diameter of the screw 2B, the resistance tube 9 may have an enlarged portion in which the flow path cross section increases from upstream to downstream. A support base 15 for supporting the molded body 70A is installed next to the extrusion molding apparatus 10 so that the molded body 70A extruded from the die 8 is not deformed. Prior to the introduction of the raw material composition into the die 8, the rectifying plate 5 and the plurality of resistance pins P are intended to make the flow velocity distribution uniform.

整流板５は、ハウジング１に対して着脱自在に設けられており、スクリュー２Ｂとダイ８の間に配置されている。図４の（ａ）は整流板５の正面図であり、図４の（ｂ）は整流板５の断面図である。整流板５は厚さ方向に貫通する複数の開口５ａを有する。整流板５は、流量調整の効果を高めるために網状の抵抗体（図示せず）を有していてもよい。網状の抵抗体として、例えば、網目数が５〜２００メッシュ（より好ましくは５０〜１５０メッシュ）の金網を使用できる。一枚又は複数枚の金網を整流板５の上流側の表面に配置することで、より高い整流効果が得られると共に、原料組成物に含まれる異物を除去できる。ここでいう金網の網目数（メッシュ）は、１インチ（２５．４ｍｍ）の間にある目数を意味する。使用するメッシュを選定するに際しては、ダイの開口（スリット幅）に対してメッシュの目開きＷが小さいことを第一条件とし、更に、強度的に十分な線径ｄを有するものを選定すればよい。メッシュ数Ｎは以下の式によって算出できる。
Ｎ＝２５．４／（Ｗ＋ｄ）
式中、Ｗはメッシュの目開き（ｍｍ）を示し、ｄはメッシュの線径（ｍｍ）を示す。 The rectifying plate 5 is detachably attached to the housing 1 and is disposed between the screw 2B and the die 8. 4A is a front view of the current plate 5, and FIG. 4B is a cross-sectional view of the current plate 5. The rectifying plate 5 has a plurality of openings 5a penetrating in the thickness direction. The rectifying plate 5 may have a net-like resistor (not shown) in order to enhance the effect of adjusting the flow rate. As the net-like resistor, for example, a wire net having a mesh number of 5 to 200 mesh (more preferably 50 to 150 mesh) can be used. By disposing one or a plurality of metal meshes on the upstream surface of the rectifying plate 5, a higher rectifying effect can be obtained, and foreign substances contained in the raw material composition can be removed. The number of meshes (mesh) of the metal mesh here means the number of meshes between 1 inch (25.4 mm). When selecting the mesh to be used, the first condition is that the mesh opening W is small with respect to the opening (slit width) of the die. Good. The number of meshes N can be calculated by the following formula.
N = 25.4 / (W + d)
In the formula, W represents the mesh opening (mm), and d represents the wire diameter (mm) of the mesh.

整流板５は、上流側から圧力を受けてもほとんど歪みを起こさない構造体であることが好ましい。かかる観点から、整流板５の材質としては、例えば、炭素鋼等が好ましい。炭素鋼以外の好適な材質として、ニッケル、クロム、タングステン等を含有する特殊鋼を例示できる。整流板５の厚さは、十分の強度を確保する観点から、１０〜１００ｍｍであることが好ましい。   The rectifying plate 5 is preferably a structure that hardly causes distortion even when pressure is received from the upstream side. From this viewpoint, the material of the rectifying plate 5 is preferably carbon steel, for example. Examples of suitable materials other than carbon steel include special steels containing nickel, chromium, tungsten and the like. The thickness of the current plate 5 is preferably 10 to 100 mm from the viewpoint of ensuring sufficient strength.

整流板５は、厚さ方向に貫通する直径１〜１０ｍｍの開口５ａを複数有する。整流板５の開口率は３０〜８０％であることが好ましい。開口率が３０％未満の整流板５を使用した場合、上流側の圧力を過度に高くしないと、単位時間当たり十分な量の原料組成物を通過させることができず、圧力が装置の許容圧力以上となりやすい。他方、開口率が８０％を超える整流板５は強度が不十分となりやすい。整流板５の開口率は４０〜８０％であることが好ましく、５０〜８０％であることがより好ましい。   The rectifying plate 5 has a plurality of openings 5a having a diameter of 1 to 10 mm penetrating in the thickness direction. The opening ratio of the rectifying plate 5 is preferably 30 to 80%. When the current plate 5 having an opening ratio of less than 30% is used, a sufficient amount of the raw material composition cannot be passed per unit time unless the upstream pressure is excessively increased, and the pressure is the allowable pressure of the apparatus. It is easy to become more. On the other hand, the current plate 5 having an aperture ratio exceeding 80% tends to have insufficient strength. The opening ratio of the rectifying plate 5 is preferably 40 to 80%, and more preferably 50 to 80%.

ここでいう「開口率」とは、整流板５の一方面における開口の面積の合計を当該一方面の面積（ハウジングによって覆われる周縁部を除く）で除すことによって算出される値を意味する。なお、開口の流路断面積が一定ではない整流板の場合、整流板の厚さ方向（原料組成物の移送方向）の位置によって開口の面積の合計は変化し得るが、「開口率」はこの合計の最小値を用いて算出される値を意味する。   Here, the “aperture ratio” means a value calculated by dividing the total area of the openings on one surface of the current plate 5 by the area of the one surface (excluding the peripheral edge covered by the housing). . In addition, in the case of a rectifying plate in which the flow passage cross-sectional area of the opening is not constant, the total area of the opening may vary depending on the position of the rectifying plate in the thickness direction (feeding direction of the raw material composition). This means a value calculated using the minimum value of the sum.

１６本の抵抗ピンＰは、図３，５に示す通り、抵抗管９の管壁を貫通するように設けられており、抵抗管９の周方向にほぼ均等の間隔で配置されている。抵抗ピンＰは、抵抗管９の内側に突出する長さを自在に変更することが可能となっている。より具体的には、抵抗ピンＰは、抵抗管９の管壁との間から原料組成物がリークしないシール機構を有しており、抵抗管９の管壁に対してスライド自在である。なお、突出する長さを変更自在とする構成として、スライド式の機構の代わりに、抵抗ピンＰに設けたネジ及び抵抗管９に設けたネジ穴によるネジ回転式の機構であってもよい。また、抵抗ピンＰの本数は、１６本に限定されるものではないが、十分な流速調整効果を得るには、１組につき、６〜３６本であることが好ましい。   As shown in FIGS. 3 and 5, the 16 resistance pins P are provided so as to penetrate the tube wall of the resistance tube 9, and are arranged at substantially equal intervals in the circumferential direction of the resistance tube 9. The length of the resistance pin P protruding inside the resistance tube 9 can be freely changed. More specifically, the resistance pin P has a seal mechanism that does not leak the raw material composition from between the resistance pin 9 and the resistance tube 9, and is slidable with respect to the resistance wall 9. Note that, as a configuration that allows the protruding length to be changed, a screw rotation type mechanism using a screw provided in the resistance pin P and a screw hole provided in the resistance tube 9 may be used instead of the slide type mechanism. Further, the number of resistance pins P is not limited to 16, but 6 to 36 are preferably used for one set in order to obtain a sufficient flow rate adjustment effect.

十分な流量調整効果を得る観点から、複数の抵抗ピンＰはダイ８の上流側の所定の位置に配置されていることが好ましい。すなわち、複数の抵抗ピンＰの中心軸がダイ８の上流側の面から１０〜１００ｍｍ（より好ましくは１０〜５０ｍｍ）の範囲に設置されていることが好ましい。   From the viewpoint of obtaining a sufficient flow rate adjustment effect, the plurality of resistance pins P are preferably arranged at predetermined positions on the upstream side of the die 8. That is, it is preferable that the central axes of the plurality of resistance pins P are installed in the range of 10 to 100 mm (more preferably 10 to 50 mm) from the upstream surface of the die 8.

抵抗ピンＰの突出長さは変更自在であり、突出長さを長くすることによってその領域を流れる原料組成物の流速を低減してグリーン成形体７０の曲がりを小さくすることができる。突出長さは、抵抗管９の抵抗ピンＰが設けられている位置の半径を基準として、０〜１２０％とすることができ（図６参照）、好ましくは０〜１００％である（図５参照）。   The protruding length of the resistance pin P can be changed. By increasing the protruding length, the flow rate of the raw material composition flowing through the region can be reduced, and the bending of the green molded body 70 can be reduced. The protruding length can be 0 to 120% (see FIG. 6), preferably 0 to 100% based on the radius of the position where the resistance pin P of the resistance tube 9 is provided (see FIG. 5). reference).

例えば、押し出されているグリーン成形体７０が上方に湾曲している場合、抵抗管９の下方領域を流れる原料組成物の流速が他の領域と比較して高いことが原因と考えられる。この場合、図５に示すように、当該領域に位置する複数の抵抗ピンＰを突出させればよい。図５において、突出長さの比率（抵抗管９の半径基準）は、下端に位置する抵抗ピンＰ１が１００％であり、その隣の抵抗ピンＰ２が７０％であり、更にその隣の抵抗ピンＰ３が３０％に設定されている。押し出されてくる成形体の曲がりの程度及び方向をチェックし、抵抗ピンＰのそれぞれの突出長さを変更することによって寸法精度が十分に高いグリーン成形体７０を継続的に製造できる。   For example, when the extruded green molded body 70 is curved upward, it is considered that the flow rate of the raw material composition flowing in the lower region of the resistance tube 9 is higher than in other regions. In this case, as shown in FIG. 5, a plurality of resistance pins P located in the region may be projected. In FIG. 5, the ratio of the protrusion length (radius reference of the resistance tube 9) is 100% for the resistance pin P1 located at the lower end, 70% for the adjacent resistance pin P2, and further for the adjacent resistance pin. P3 is set to 30%. The green molded body 70 having sufficiently high dimensional accuracy can be continuously manufactured by checking the degree and direction of bending of the extruded molded body and changing the protruding length of each resistance pin P.

抵抗ピンＰは、先端がテーパ状になっていることが好ましい。かかる構成を採用することにより、各抵抗ピンＰを抵抗管９の中心部にまで突出させた場合でも、隣接する抵抗ピンＰ同士が干渉することを十分に抑制できる。全ての抵抗ピンＰを中心部まで突出させた場合、すなわち、全ての抵抗ピンＰの突出長さの比率を１００％とした場合、抵抗管９の抵抗ピンＰが設けられている位置の流路断面積を１００とすると、抵抗ピンＰによって遮られた部分を除く流路断面積は１０〜５０程度であることが好ましい。この流路断面積の割合を１０未満とすることは装置の機構が複雑化する傾向にあり、５０を超えると抵抗ピンＰによる流速調整効果が不十分となりやすい。   It is preferable that the tip of the resistance pin P is tapered. By adopting such a configuration, even when each resistance pin P protrudes to the center of the resistance tube 9, it is possible to sufficiently suppress the adjacent resistance pins P from interfering with each other. When all the resistance pins P are projected to the center, that is, when the ratio of the projection lengths of all the resistance pins P is 100%, the flow path at the position where the resistance pins P of the resistance tube 9 are provided. Assuming that the cross-sectional area is 100, the cross-sectional area of the flow path excluding the portion blocked by the resistance pin P is preferably about 10-50. Setting the ratio of the flow path cross-sectional area to less than 10 tends to complicate the mechanism of the apparatus, and if it exceeds 50, the effect of adjusting the flow velocity by the resistance pin P tends to be insufficient.

図３に示すように、抵抗ピンＰは抵抗管９の中心軸とのなす角度が９０°となるように配置してもよく、上流側もしくは下流側に傾斜するように配置してもよい。抵抗ピンＰを上流側又は下流側に傾斜させる場合、抵抗ピンＰの傾斜角は、抵抗管９の中心軸を法線とする面に対して３０°以内であることが好ましい。   As shown in FIG. 3, the resistance pin P may be arranged so that the angle formed with the central axis of the resistance tube 9 is 90 °, or may be arranged so as to be inclined upstream or downstream. When the resistance pin P is inclined to the upstream side or the downstream side, the inclination angle of the resistance pin P is preferably within 30 ° with respect to a plane whose normal is the central axis of the resistance tube 9.

抵抗ピンＰは、図７に示すように、先端部Ｐａを除き中空であり、中空部Ｐｂには冷媒を導入するための管Ｐｃが挿入されている。管Ｐｃから冷媒（例えば、冷水、エチレングリコール水溶液に代表される不凍液）を抵抗ピンＰの先端に供給できるように構成されている。冷媒が中空部Ｐｂを通過することで抵抗ピンＰが冷却され、冷媒は抵抗ピンＰの基端側へと戻る。図７中の矢印は冷媒の流れを示す。なお、抵抗ピンＰを加温する場合は冷媒の代わりに熱媒（例えば、熱水、シリコンオイル）を使用すればよい。本実施形態においては、先端部Ｐａ、中空部Ｐｂ及び管Ｐｃによって冷熱媒体循環ジャケット（温度調整手段）Ｐｔｃが構成されている。抵抗ピンＰの全て（本実施形態においては１６本）が冷熱媒体循環ジャケットＰｔｃを有していることが好ましい。   As shown in FIG. 7, the resistance pin P is hollow except for the tip end portion Pa, and a tube Pc for introducing a refrigerant is inserted into the hollow portion Pb. A refrigerant (for example, an antifreeze liquid typified by cold water or an ethylene glycol aqueous solution) can be supplied from the pipe Pc to the tip of the resistance pin P. The resistance pin P is cooled by the refrigerant passing through the hollow portion Pb, and the refrigerant returns to the proximal end side of the resistance pin P. The arrows in FIG. 7 indicate the flow of the refrigerant. In addition, what is necessary is just to use a heat medium (for example, hot water, silicone oil) instead of a refrigerant | coolant, when heating the resistance pin P. FIG. In the present embodiment, the cooling medium circulation jacket (temperature adjusting means) Ptc is constituted by the tip portion Pa, the hollow portion Pb, and the pipe Pc. It is preferable that all of the resistance pins P (16 in the present embodiment) have the cooling medium circulation jacket Ptc.

抵抗ピンＰの温度を調整する手段としては、上記のような冷熱媒体循環ジャケットが好ましいが、これの代わりに、あるいは、これと共に電気式冷却機（例えば、ペルチェ素子）、電気式加熱機又はこれらの組み合わせを採用してもよい。抵抗ピンＰの温度を調整することにより、流量制御を目的として抵抗ピンＰの突出長さを調節する際に抵抗ピンＰとペースト状の原料組成物の間の摩擦を低減でき、当該操作を円滑に行うことができる。   As a means for adjusting the temperature of the resistance pin P, the cooling medium circulation jacket as described above is preferable, but instead of or together with this, an electric cooler (for example, a Peltier element), an electric heater, or these You may employ | adopt the combination of. By adjusting the temperature of the resistance pin P, the friction between the resistance pin P and the paste-like raw material composition can be reduced when adjusting the protruding length of the resistance pin P for the purpose of controlling the flow rate, and the operation is smoothly performed. Can be done.

ダイ８は、原料組成物から図１に示す形状の成形体を製造するためのものであり、これに対応する格子状の流路（図示せず）を有する。グリーン成形体７０のようなセル構造の成形体の製造に用いられるダイは、流路の設定を緻密に行う必要があり、また一般的に高価である。このため、ダイの交換作業の頻度はなるべく低くすることが望ましい。本実施形態においては、ｔ９における抵抗ピンＰの突出長さを変更することでダイ８の設定を変更する頻度を低減できると共に、原料組成物の流量の均一化によりダイ８の長寿命化が図られ、その交換頻度を低くできる。   The die 8 is for producing a molded body having the shape shown in FIG. 1 from the raw material composition, and has a grid-like flow path (not shown) corresponding thereto. A die used for manufacturing a molded body having a cell structure such as the green molded body 70 needs to set the flow path precisely, and is generally expensive. For this reason, it is desirable to reduce the frequency of die replacement work as much as possible. In the present embodiment, the frequency of changing the setting of the die 8 can be reduced by changing the protruding length of the resistance pin P at t9, and the life of the die 8 can be extended by making the flow rate of the raw material composition uniform. The replacement frequency can be lowered.

なお、上記実施形態においては、抵抗管９の管壁に複数の抵抗ピンＰを設ける場合を例示したが、複数の抵抗ピンを設ける位置は整流板５とダイ８の間であれば、これに限定されない。例えば、抵抗管（テーパ部）９の下流側に延長管（直管部）９ａを接続した場合、抵抗管９又は延長管９ａに複数の抵抗ピンＰを設けてもよいし（図８参照）、抵抗管９及び延長管９ａの両方に複数の抵抗ピンＰを設けてもよい。   In the above embodiment, the case where a plurality of resistance pins P are provided on the tube wall of the resistance tube 9 is exemplified. However, if the position where the plurality of resistance pins are provided is between the rectifying plate 5 and the die 8, It is not limited. For example, when an extension tube (straight tube portion) 9a is connected to the downstream side of the resistance tube (tapered portion) 9, a plurality of resistance pins P may be provided on the resistance tube 9 or the extension tube 9a (see FIG. 8). A plurality of resistance pins P may be provided on both the resistance tube 9 and the extension tube 9a.

＜グリーン成形体の製造方法＞
次に、押出成形装置１０を用いてグリーン成形体７０を製造する方法について説明する。まず、原料組成物を入口１ａから流路１ｂ内に導入する。スクリュー２Ａ，２Ｂ及びローラ３ａを作動させることによって原料組成物を混練すると共に下流側に移送する。混練物を整流板５の開口５ａを通過させて流速分布を均一化させた後、抵抗管９を通じてダイ８に導入する。ダイ８の下流側における原料組成物の線速度は１０〜１５０ｃｍ／分程度とすることができる。 <Method for producing green molded body>
Next, a method for manufacturing the green molded body 70 using the extrusion molding apparatus 10 will be described. First, the raw material composition is introduced into the flow path 1b from the inlet 1a. By operating the screws 2A, 2B and the roller 3a, the raw material composition is kneaded and transferred downstream. The kneaded material is passed through the opening 5 a of the rectifying plate 5 to make the flow velocity distribution uniform, and then introduced into the die 8 through the resistance tube 9. The linear velocity of the raw material composition on the downstream side of the die 8 can be about 10 to 150 cm / min.

流速分布の均一化が図られた原料組成物をダイ８から押し出し、支持台１５上に成形体７０Ａを回収する。成形体７０Ａを所定の長さに切断することによってグリーン成形体７０を得る。   The raw material composition having a uniform flow velocity distribution is extruded from the die 8 and the compact 70 </ b> A is collected on the support base 15. The green molded body 70 is obtained by cutting the molded body 70A into a predetermined length.

整流板５の整流作用のみでは流速分布の均一化が不十分でグリーン成形体７０の曲がりの程度が顕著となったとき、抵抗ピンＰの突出長さを変更する工程を実施する。抵抗ピンＰの突出長さを変更するに先立ち、突出長さを変更する抵抗ピンＰの温度を温度調整手段Ｐｔｃによって所定の温度に調整する。抵抗ピンＰの突出長さを調節する操作をより円滑に行うためには、抵抗ピンＰの温度を、例えばハウジング１の温度又は抵抗管９の温度と同等又はそれ以下になるように制御することが好ましい。より具体的には抵抗ピンＰの温度を好ましくは５〜３０℃の範囲、より好ましくは１０〜２５℃の範囲となるように調整することが好ましい。なお、抵抗ピンＰの温度調整は手動で温度を設定することによって行ってもよく自動で行ってもよい。   When the flow rate distribution is not sufficiently uniformed only by the rectifying action of the rectifying plate 5, and the degree of bending of the green molded body 70 becomes significant, a step of changing the protruding length of the resistance pin P is performed. Prior to changing the protruding length of the resistor pin P, the temperature of the resistor pin P whose protruding length is changed is adjusted to a predetermined temperature by the temperature adjusting means Ptc. In order to perform the operation of adjusting the protruding length of the resistance pin P more smoothly, the temperature of the resistance pin P is controlled to be equal to or lower than the temperature of the housing 1 or the resistance tube 9, for example. Is preferred. More specifically, it is preferable to adjust the temperature of the resistance pin P so that it is preferably in the range of 5 to 30 ° C, more preferably in the range of 10 to 25 ° C. The temperature adjustment of the resistance pin P may be performed by manually setting the temperature or automatically.

温度調整された抵抗ピンＰの突出長さを変更する工程は、押出成形装置１０への原料組成物の供給を停止することなく実施できる。これにより、ダイ８の設定の変更や交換を実施しなくても寸法精度が十分に高いグリーン成形体７０を十分に長期にわたって効率的に製造することが可能となる。特に、複数の抵抗ピンＰの突出長さを自動制御する機構を備えた押出成形装置を用いれば、抵抗ピンＰの突出長さを自動的に変更することができる。   The step of changing the protruding length of the resistance pin P whose temperature has been adjusted can be performed without stopping the supply of the raw material composition to the extrusion molding apparatus 10. As a result, the green molded body 70 with sufficiently high dimensional accuracy can be efficiently manufactured over a long period of time without changing or changing the setting of the die 8. In particular, if an extrusion molding apparatus having a mechanism for automatically controlling the protruding lengths of the plurality of resistance pins P is used, the protruding lengths of the resistance pins P can be automatically changed.

図９に示す押出成形装置２０は、複数の抵抗ピンＰのそれぞれの突出長さを自動で制御する機構を更に具備する他は、上述の押出成形装置１０と同様の構成を有する。押出成形装置２０は、ダイ８から押し出される成形体７０Ａの曲がりの程度及び方向を検知するセンサ１２と、センサ１２からのデータに基づいて複数の抵抗ピンＰの突出させるべき長さを算出するコンピュータ１３と、コンピュータ１３からの出力に基づいて複数の抵抗ピンＰのそれぞれの突出長さを変更するピン駆動機構１４とを更に備える。センサ１２としては、レーザー光又はＬＥＤ光Ｌを利用した非接触式変位センサや非接触式寸法測定器などを使用することができる。ピン駆動機構１４としては、抵抗ピンＰがスライド式又はネジ回転式のものである場合、歯車等によって抵抗ピンＰを往復運動又は回転運動させるものを採用することができる。   The extrusion molding apparatus 20 shown in FIG. 9 has the same configuration as the above-described extrusion molding apparatus 10 except that it further includes a mechanism that automatically controls the protruding lengths of the plurality of resistance pins P. The extrusion molding device 20 is a computer 12 that detects the degree and direction of bending of the molded body 70 </ b> A extruded from the die 8, and a computer that calculates the length of the plurality of resistance pins P to be projected based on data from the sensor 12. 13 and a pin drive mechanism 14 that changes the protruding length of each of the plurality of resistance pins P based on the output from the computer 13. As the sensor 12, a non-contact type displacement sensor using a laser beam or LED light L, a non-contact type size measuring device, or the like can be used. As the pin drive mechanism 14, when the resistance pin P is a slide type or a screw rotation type, a mechanism that reciprocates or rotates the resistance pin P with a gear or the like can be adopted.

図１０は、センサ１２として非接触式変位センサＬＫ−Ｇ（商品名、株式会社キーエンス製）を使用した場合の曲がり検出機構の構成を示す図である。レーザー光又はＬＥＤ光Ｌを発する発光素子１２ａと、受光素子１２ｂとからなるセンサを４組（非接触式変位センサ１２Ａ〜１２Ｄ）使用することによって、成形体７０Ａの曲がりを検出する。図１０中の破線からなる円Ｙは真っ直ぐな成形体７０Ａが得られている場合の成形体断面位置を示し、実線からなる円Ｎは曲がりが発生した状態の成形体断面位置をそれぞれ示すものである。なお、非接触式変位センサ１２Ａ，１２Ｂの２組であってもよい。   FIG. 10 is a diagram illustrating a configuration of a bending detection mechanism when a non-contact displacement sensor LK-G (trade name, manufactured by Keyence Corporation) is used as the sensor 12. By using four sets (non-contact type displacement sensors 12A to 12D) of sensors including a light emitting element 12a that emits laser light or LED light L and a light receiving element 12b, the bending of the molded body 70A is detected. A circle Y consisting of a broken line in FIG. 10 indicates the cross-sectional position of the molded body when a straight molded body 70A is obtained, and a circle N consisting of a solid line indicates the cross-sectional position of the molded body where bending has occurred. is there. Two sets of non-contact type displacement sensors 12A and 12B may be used.

図１１は、センサ１２として非接触式寸法測定器ＬＳ−７０００（商品名、株式会社キーエンス製）を使用した場合の曲がり検出機構の構成を示す図である。成形体７０Ａの周りを取り囲むように１６台の非接触式寸法測定器１２ａ〜１２ｐが配置されている。図１１中の破線からなる円Ｙは真っ直ぐな成形体７０Ａが得られている場合の成形体断面位置を示し、実線からなる円Ｎは曲がりが発生した状態の成形体断面位置をそれぞれ示すものである。なお、図１１のように非接触式寸法測定器を配置する場合、その台数は抵抗ピンＰの本数と特に相関があるわけではないが、抵抗ピンＰの本数よりも多いことが好ましい。また、対向する一対の測定器のどちらか一方のみでもよく、例えば、図１１に示す測定器１２ａ〜１２ｈのみでもよい。   FIG. 11 is a diagram illustrating a configuration of a bending detection mechanism when a non-contact type dimension measuring device LS-7000 (trade name, manufactured by Keyence Corporation) is used as the sensor 12. Sixteen non-contact type dimension measuring devices 12a to 12p are arranged so as to surround the molded body 70A. A circle Y consisting of a broken line in FIG. 11 indicates the cross-sectional position of the molded body when a straight molded body 70A is obtained, and a circle N consisting of a solid line indicates the cross-sectional position of the molded body where bending has occurred. is there. When the non-contact size measuring device is arranged as shown in FIG. 11, the number thereof is not particularly correlated with the number of resistance pins P, but is preferably larger than the number of resistance pins P. Moreover, only one of a pair of opposing measuring devices may be sufficient, for example, only measuring device 12a-12h shown in FIG. 11 may be sufficient.

以上、本発明の好適な実施形態について詳細に説明したが、本発明は上記実施形態に限定されるものではない。例えば、上記実施形態においては、円柱体のグリーン成形体７０を例示したが、成形体の形状や構造はこれに限定されない。グリーン成形体７０の外形形状は、例えば、四角柱等の角柱や楕円柱でもよい。また、貫通孔７０ａの配置も、正方形配置でなくてもよく、例えば、略三角配置、略六角配置等でも構わない。更に、貫通孔７０ａの形状も、正方形でなくてもよく、例えば、略三角形、略六角形、略八角形、略円形及びこれらの組み合わせであってもよい。複数の形状の組み合わせとしては、正六角形と非対称六角形の組み合わせ（図１２参照）、及び、四角形と八角形の組み合わせ（オクトスクエア）などが挙げられる。   The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the cylindrical green molded body 70 is illustrated, but the shape and structure of the molded body are not limited thereto. The outer shape of the green molded body 70 may be, for example, a rectangular column such as a quadrangular column or an elliptical column. Further, the arrangement of the through holes 70a may not be a square arrangement, and may be, for example, a substantially triangular arrangement, a substantially hexagonal arrangement, or the like. Furthermore, the shape of the through hole 70a may not be square, and may be, for example, a substantially triangular shape, a substantially hexagonal shape, a substantially octagonal shape, a substantially circular shape, or a combination thereof. Examples of the combination of a plurality of shapes include a combination of a regular hexagon and an asymmetric hexagon (see FIG. 12), a combination of a square and an octagon (octosquare), and the like.

図１２に示すグリーンハニカム成形体８０は、断面形状が異なる複数の貫通孔８１ａ，８１ｂを有する。複数の貫通孔８１ａ，８１ｂは、グリーンハニカム成形体８０の中心軸に略平行に延びる隔壁８２により仕切られている。貫通孔８１ａは断面形状が正六角形である。一方、貫通孔８１ｂは断面形状が扁平六角形であり一つの貫通孔８１ａを囲むように配置されている。   A green honeycomb molded body 80 shown in FIG. 12 has a plurality of through holes 81a and 81b having different cross-sectional shapes. The plurality of through holes 81 a and 81 b are partitioned by a partition wall 82 extending substantially parallel to the central axis of the green honeycomb molded body 80. The through hole 81a has a regular hexagonal cross-sectional shape. On the other hand, the through-hole 81b has a flat hexagonal cross-sectional shape and is disposed so as to surround one through-hole 81a.

本発明によれば、曲がりが十分に小さく、寸法精度が高い成形体を効率的に製造できる。   According to the present invention, it is possible to efficiently produce a molded body with sufficiently small bending and high dimensional accuracy.

１…ハウジング、１ｂ…流路、２Ｂ…スクリュー、５…整流板、５ａ…開口、８…ダイ、９…抵抗管（テーパ部）、９ａ…延長管（直管部）、１０，２０…押出成形装置、１２…センサ、１２Ａ，１２Ｂ…非接触式変位センサ（センサ）、１２ａ〜１２ｐ…非接触式寸法測定器（センサ）、１３…コンピュータ、１４…ピン駆動機構、７０，８０…グリーン成形体、７０Ａ…成形体、Ｐ（Ｐ１，Ｐ２，Ｐ３）…抵抗ピン、Ｐａ…先端部、Ｐｂ…中空部、Ｐｃ…管、Ｐｔｃ…冷熱媒体循環ジャケット（温度調節手段）。 DESCRIPTION OF SYMBOLS 1 ... Housing, 1b ... Flow path, 2B ... Screw, 5 ... Current plate, 5a ... Opening, 8 ... Die, 9 ... Resistance pipe (taper part), 9a ... Extension pipe (straight pipe part) 10, 20 ... Extrusion Molding device, 12 ... sensor, 12A, 12B ... non-contact displacement sensor (sensor), 12a to 12p ... non-contact dimension measuring device (sensor), 13 ... computer, 14 ... pin drive mechanism, 70, 80 ... green molding Body, 70A ... molded body, P (P1, P2, P3) ... resistance pin, Pa ... tip, Pb ... hollow part, Pc ... pipe, Ptc ... cooling medium circulation jacket (temperature adjusting means).

Claims (3)

ペースト状の原料組成物を移送する流路と、
前記流路の上流側に設けられ、前記原料組成物を混練すると共に下流側へと移送するスクリューと、
前記流路の下流側に設けられ、前記原料組成物からなる成形体が押し出されるダイと、
前記スクリューと前記ダイの間に設けられ、厚さ方向に貫通する複数の開口を有する整流板と、
前記整流板の下流側と前記ダイを連通する抵抗管と、
前記抵抗管の管壁を貫通するように設けられ、前記抵抗管の内側に突出する長さがそれぞれ変更自在の複数の抵抗ピンと、
前記複数の抵抗ピンの温度を調整する手段と、
を備える押出成形装置。 A flow path for transferring a paste-like raw material composition;
A screw provided on the upstream side of the flow path, kneading the raw material composition and transferring it downstream;
A die provided on the downstream side of the flow path, from which a molded body made of the raw material composition is extruded;
A rectifying plate provided between the screw and the die and having a plurality of openings penetrating in the thickness direction;
A resistance tube communicating with the downstream side of the current plate and the die;
A plurality of resistance pins provided so as to pass through the tube wall of the resistance tube, and the length protruding inside the resistance tube can be changed respectively;
Means for adjusting the temperature of the plurality of resistance pins;
An extrusion apparatus comprising: 前記温度を調整する手段は、冷熱媒体循環ジャケット、電気式冷却機、電気式加熱機又はこれらの組合せである、請求項１に記載の装置。   The apparatus according to claim 1, wherein the means for adjusting the temperature is a cooling medium circulation jacket, an electric cooler, an electric heater, or a combination thereof. 請求項１又は２に記載の押出成形装置を用いた成形体の製造方法であり、温度調整された前記抵抗ピンの突出長さを変更する工程を備える方法。   It is a manufacturing method of the molded object using the extrusion molding apparatus of Claim 1 or 2, Comprising: The method provided with the process of changing the protrusion length of the said resistance pin by which temperature adjustment was carried out.
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