WO1994024067A1 - Sintered product manufacturing method using resin shell mold - Google Patents

Sintered product manufacturing method using resin shell mold Download PDF

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Publication number
WO1994024067A1
WO1994024067A1 PCT/JP1993/000488 JP9300488W WO9424067A1 WO 1994024067 A1 WO1994024067 A1 WO 1994024067A1 JP 9300488 W JP9300488 W JP 9300488W WO 9424067 A1 WO9424067 A1 WO 9424067A1
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WO
WIPO (PCT)
Prior art keywords
sintered
mold
sintered product
resin
shape
Prior art date
Application number
PCT/JP1993/000488
Other languages
French (fr)
Japanese (ja)
Inventor
Takeo Nakagawa
Jie Wei
Naoichiro Saito
Seiji Hayano
Original Assignee
Cmet, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP3321226A priority Critical patent/JP2585492B2/en
Application filed by Cmet, Inc. filed Critical Cmet, Inc.
Priority to PCT/JP1993/000488 priority patent/WO1994024067A1/en
Publication of WO1994024067A1 publication Critical patent/WO1994024067A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • 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
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
    • B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
    • B29C64/129—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask
    • B29C64/135—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask the energy source being concentrated, e.g. scanning lasers or focused light sources
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/02—Moulding by agglomerating
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
    • B29C33/3857—Manufacturing moulds, e.g. shaping the mould surface by machining by making impressions of one or more parts of models, e.g. shaped articles and including possible subsequent assembly of the parts

Definitions

  • the present invention relates to a method for manufacturing a sintered product, and particularly to a method for manufacturing a sintered product capable of simplifying a process up to forming a molding die and manufacturing a sintered product having an extremely complicated shape. It is about.
  • a sintered product having a simple external shape such as a dish
  • it is necessary to provide a cavity corresponding to the shape of the sintered product manufacture a mold that can be divided, and use this mold for firing.
  • the binder can be formed into the shape of a sintered product, and this can be sintered.
  • the mold for making the mold is first manufactured, and the mold is made using this (a-2), and the sintered material is filled inside the mold. Then (a-3), preheating is performed to give the sintered material shape-retaining ability, the mold is destroyed (a-4), and this is sintered to produce a sintered product (a-5).
  • a mold for creating a wax model having the same shape as the sintered product to be manufactured is manufactured in advance, and a wax model is created using the mold (b-2).
  • the mold B is filled around the periphery of the wax model (b-3), and the wax model is burned off to form a mold (a-2).
  • the process up to forming the mold is simplified,
  • the aim is to make it possible to easily create a mold with a complicated shape, reduce the production cost of sintered products, and shorten the production period.
  • the present invention is a method of filling a mold with a sintered material and sintering the molded sintered material to produce a sintered product.
  • the photo-curing molding method refers to a resin cured product having a three-dimensional shape corresponding to an irradiation area by irradiating an arbitrary position in three dimensions to a liquid resin that cures when irradiated with light.
  • This is, for example, a technology disclosed in Japanese Patent Application Laid-Open No. 56-144478.
  • the outer resin mold refers to a resin molded product having a hollow space defined by an inner surface inside the outer skin as a main body.
  • a skin resin molding die corresponding to a conventional sintered material molding die is formed at once by a photo-curing molding method.
  • the process up to creation is simplified.
  • a molding die having a remarkably complicated shape can be easily formed by using a die-cutting method, a sintered product having a complicated shape can be easily manufactured. .
  • FIG. 1 is a cross-sectional view of a skin resin mold prepared by a photocuring molding method.
  • Fig. 2 is a process diagram of preparing an outer resin molding die by a photo-curing molding method.
  • Fig. 3 is a process diagram of filling a sintering material into a concave portion of the outer resin molding die.
  • Figure 4 is a cross-sectional view of a sintered product in a high-temperature furnace.
  • FIG. 5 is a diagram comparing the conventional method (a-1 to 5) for producing a sintered product and the lost wax method (b-1 to 3) with the method (c-1 to 4) according to the present invention.
  • the method for manufacturing a sintered product according to the present embodiment includes the following steps.
  • the three-dimensional shape of the sintered product 11, that is, the shape of the outer surface 12 is designed using a three-dimensional CAD system.
  • three-dimensional shape information of the sintered product 11 is defined by the three-dimensional CAD system.
  • the outer resin mold 1 shown in FIG. 1 is prepared. For this, a light curing molding method is used.
  • the surface of a liquid photo-curable resin 2 is irradiated with strong ultraviolet rays 3, thereby curing the resin 2 in the irradiated area, and forming this into several layers.
  • the three-dimensional resin cured image 1 is created by laminating the resin. The obtained shape is determined by the trajectory of the laser beam 3.
  • a spot of the laser beam 3 is applied to the surface of the photo-curable resin 2 filled in the tank, and the laser beam 3 is two-dimensionally moved by the scanner 5. Thereby, a part of the surface is solidified. Then, the solidified material is settled from the liquid surface by the thickness of one layer by the stage 4, and the liquid resin 2 of one layer is introduced on the solidified portion. Next, the liquid portion is similarly solidified. This solid image is laminated and integrated on the lower solidified image. By repeating this, you can add more layers.
  • the present embodiment based on the data of the three-dimensional CAD system, only the portion corresponding to the outside of the outline of the ceramic sintered product 11 is irradiated, and the outer resin molding die 1 is formed. As a result, the inner surface 7 of the outer resin molding die 1 coincides with the outer surface 12 of the sintered product 11.
  • the outer side of the outer shell 6 may be reinforced with a honeycomb structure or the like.
  • the formed outer resin mold 1 is composed of an outer shell 6 and has a substantially box shape in which an upper portion is opened and a concave portion 8 is formed.
  • the inner surface 7 of the resin mold 1 on the side of the concave portion 8 coincides with the outer surface 12 of the sintered product 11. That is, The shape of the recess 8 is the same as the outer shape of the sintered product 11.
  • the outer resin molding die is formed at a stroke by the photo-curing molding method, so that the forming die forming process is greatly simplified.
  • the outer shell resin mold 1 is filled with a sintered material 9. Normally, the sintered material 9 is fluidized by adding water and a deflocculant. After the concave portion 8 is filled with the sintered material 9 by force, the mold 1 is placed in a dryer or a preheating furnace and dried at a predetermined temperature (about 300 ° C.) for a predetermined time.
  • a predetermined temperature about 300 ° C.
  • the dried sintered material 9 is put together with the mold 1 into a high-temperature furnace (600 ° C.).
  • the resin 2 constituting the outer resin mold 1 is burned off. Prior to this burning, the resin 2 expands by heating. Since the outer resin molding die 1 is not solid but has an outer shell structure, the stress due to this thermal expansion is small, and no excessive force acts on the sintered material 9 side. Therefore, cracks do not occur even in places where stress tends to concentrate, such as the groove 13 shown in FIG.
  • the vaporizing gas power of the flour is small, and there is little contamination in the working environment or inside the sintering furnace.
  • the present invention is not limited to ceramic products, and the present invention can be applied as long as it can be manufactured by force sintering described as an example of the ceramic product 11 as a sintered product.
  • powdered metal that hardens by sintering can be used as the sintering material.
  • the manufactured product is not limited to the final product, but may be a part or a mold.
  • the outer resin molding die force is created at once from the three-dimensional CAD data by the photo-curing molding method. Therefore, the production of a sintered product can be performed in a short period of time and at low cost.
  • the shape flexibility of the outer resin mold is large. Therefore, sintered products with complicated shapes can be easily manufactured ⁇

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Ceramic Engineering (AREA)
  • Optics & Photonics (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Moulds, Cores, Or Mandrels (AREA)

Abstract

This invention aims at simplifying a mold preparing process and developing a method capable of easily forming a mold of a very complicated shape, so as to reduce the sintered product manufacturing cost and time. A method capable of achieving the object has the steps of forming, using a photohardening molding method, a resin shell mold the inner surface of which is in conformity with the outer surface of a sintered product to be manufactured, filling a space inside the inner surface of the resin shell mold with a material to be sintered, and sintering the molded material to be sintered.

Description

明 細 書 外皮樹脂成形型を用 ゝる焼結品製造方法  Description Manufacturing method of sintered product using outer resin mold
[技術分野] [Technical field]
本発明は焼結品製造方法に関するものであり、 特に成形型の作成までの工程を 簡略化することができるとともに、 極めて複雑な形状を有する焼結品を製造する ことのできる焼結品製造方法に関するものである。  The present invention relates to a method for manufacturing a sintered product, and particularly to a method for manufacturing a sintered product capable of simplifying a process up to forming a molding die and manufacturing a sintered product having an extremely complicated shape. It is about.
[背景技術]  [Background technology]
例えば、 お皿等簡単な外形形状を有する焼結品を製造する際には、焼結品の形 状に対応するキヤビティを備えるとともに、型割り可能な型を製造し、 この型を 用いて焼結材を焼結品の形状に成形し、 これを焼結することができる。  For example, when manufacturing a sintered product having a simple external shape such as a dish, it is necessary to provide a cavity corresponding to the shape of the sintered product, manufacture a mold that can be divided, and use this mold for firing. The binder can be formed into the shape of a sintered product, and this can be sintered.
しかしながら、 電子部品に用いられるセラミック製品など複雑な形状をしてい る焼結体は容易に型抜きすることができない。 した力つて、前記方法で成形でき る形状は比較的単純な形状に限られている。  However, a sintered body having a complicated shape such as a ceramic product used for an electronic component cannot be easily die-cut. Due to these forces, the shapes that can be formed by the above method are limited to relatively simple shapes.
容易に型抜きできな ヽ複雑な形状を有する焼結品を製造する際には、 例えば図 型 When manufacturing sintered products with complicated shapes,
5の a— 1に示すように、 成形型を作成するための型を最初に製造し、 これを用 いて成形型を作成し （a— 2 ) 、 この成形型の内部に焼結材を充填し （a— 3 )、 予熱して焼結材に保形能力を与えるとともに、 成形型を破壊し （ a— 4 ) 、 これ を焼結して焼結品を製造する （ a— 5 )。 As shown in 5a-1, the mold for making the mold is first manufactured, and the mold is made using this (a-2), and the sintered material is filled inside the mold. Then (a-3), preheating is performed to give the sintered material shape-retaining ability, the mold is destroyed (a-4), and this is sintered to produce a sintered product (a-5).
あるいは、 （b— 1 ) に示すように、 製造したい焼結品と同一形状のワックス モデルを作成するための型をあらかじめ製造し、 これを用いてワックスモデルを 作成し （b— 2 ) 、 このワックスモデルの外周に型材 Bを充填して （b— 3 )、 さらにワックスモデルを焼失させて成形型を作成する （a— 2 )。  Alternatively, as shown in (b-1), a mold for creating a wax model having the same shape as the sintered product to be manufactured is manufactured in advance, and a wax model is created using the mold (b-2). The mold B is filled around the periphery of the wax model (b-3), and the wax model is burned off to form a mold (a-2).
この場合にも、 形状が複雑になると、 成形型作成型 ( a - 1 ) あるいはヮック スモデル作成型 （b— 1 ) の構造は非常に複雑となり、 実用上は焼結後、觀加 ェすることにより、 焼結品の形状を修正することがしばしば必要となる。  In this case, too, when the shape becomes complicated, the structure of the mold making mold (a-1) or the plex model making mold (b-1) becomes very complicated, and in practice, it should be observed after sintering. Therefore, it is often necessary to modify the shape of the sintered product.
[発明の開示]  [Disclosure of the Invention]
そこで、 本発明では、 成形型作成までのプロセスを単純ィ匕するとともに、 非常 に複雑な形状の成形型を容易に作成できるようにし、 もつて焼結品の製造コスト を低減させ、 製造期間を短縮化しようとするものである。 Therefore, in the present invention, the process up to forming the mold is simplified, The aim is to make it possible to easily create a mold with a complicated shape, reduce the production cost of sintered products, and shorten the production period.
上記技術課題を解決するために、 本発明では焼結材を成形型に充填し、 成形さ れた焼結材を焼結して焼結品を製造する方法であり、製造する焼結品の外表面に 一致する内表面を有する外皮樹脂成形型を光硬化造形法に従つて作成する工程と、 焼結材を該外皮樹脂成形型の該内表面側に充填する工程と、 成形された焼結材を 焼結する工程とを有することを特徴とする外皮樹脂成形型を用 、る焼結品製造方 法を創作した。  In order to solve the above technical problem, the present invention is a method of filling a mold with a sintered material and sintering the molded sintered material to produce a sintered product. A step of forming an outer resin mold having an inner surface corresponding to the outer surface in accordance with a photo-curing molding method; a step of filling a sintering material into the inner surface of the outer resin mold; A method for producing a sintered product using an outer resin molding die characterized by having a step of sintering a binder.
なお、 ここでいう光硬化造形法とは、 光を照射すると硬化する液状の樹脂に対 し、 3次元における任意の位置に光を照射して照射領域に対応した立体形状を有 する樹脂硬化物を造形する技術であり、 例えば特開昭 5 6 - 1 4 4 4 7 8号公報 に開示されているものをいう。  Here, the photo-curing molding method refers to a resin cured product having a three-dimensional shape corresponding to an irradiation area by irradiating an arbitrary position in three dimensions to a liquid resin that cures when irradiated with light. This is, for example, a technology disclosed in Japanese Patent Application Laid-Open No. 56-144478.
また、 外皮樹脂成形型とは、 外皮を主体として内側に内表面で規定される中空 空間を有する樹脂造形物をいう。  In addition, the outer resin mold refers to a resin molded product having a hollow space defined by an inner surface inside the outer skin as a main body.
本発明によれば、 図 5の c—1に示されるように、従来の焼結材成形型に相当 する外皮樹脂成形型が光硬化造形法によつて一挙に作成されるため、 成形型の作 成までの工程が簡略化される。 また、 光硬化造形法では、 型抜き法による場合に J:匕して、 著しく複雑な形状の成形型をも容易に作成できるために、 複雑な形状の 焼結品が容易に製造可能となる。  According to the present invention, as shown in c-1 in FIG. 5, a skin resin molding die corresponding to a conventional sintered material molding die is formed at once by a photo-curing molding method. The process up to creation is simplified. In addition, in the photo-curing molding method, since a molding die having a remarkably complicated shape can be easily formed by using a die-cutting method, a sintered product having a complicated shape can be easily manufactured. .
[図面の簡単な説明]  [Brief description of drawings]
図 1 光硬化造形法によつて作成された外皮樹脂成形型の断面図である。  FIG. 1 is a cross-sectional view of a skin resin mold prepared by a photocuring molding method.
図 2 光硬化造形法による外皮樹脂成形型作成の工程図である。  Fig. 2 is a process diagram of preparing an outer resin molding die by a photo-curing molding method.
図 3 外皮樹脂成形型の凹部に焼結材を充填する工程図である。  Fig. 3 is a process diagram of filling a sintering material into a concave portion of the outer resin molding die.
図 4 高温炉内の焼結品の断面図である。  Figure 4 is a cross-sectional view of a sintered product in a high-temperature furnace.
図 5 従来の焼結品製造方法 （a— 1〜5 ) 及びロストワックス法 （b— 1〜 3 ) と本発明に係る方法 （c一 1〜4 ) とを比較した図である。  FIG. 5 is a diagram comparing the conventional method (a-1 to 5) for producing a sintered product and the lost wax method (b-1 to 3) with the method (c-1 to 4) according to the present invention.
[発明を実施するための最良の形態]  [Best Mode for Carrying Out the Invention]
以下、 本発明の実施例として図 4に示すセラミックス焼結品 1 1を製造する場 合を例として説明する。 本実施例にかかる焼結品製造方法は次に述べる各工程を実施する。 Hereinafter, as an example of the present invention, a case where a ceramic sintered product 11 shown in FIG. 4 is manufactured will be described as an example. The method for manufacturing a sintered product according to the present embodiment includes the following steps.
(1) まず、最初に 3次元の C A Dシステムを用いて焼結品 1 1の 3次元形状、 すなわち、 外表面 1 2の形状を設計をする。 この結果、 3次元の C A Dシステム によって焼結品 1 1の 3次元の形状情報が定義される。 次に図 1に示される外皮 樹脂成形型 1の作成が実施される。 これには光硬化造形法が用いられる。  (1) First, the three-dimensional shape of the sintered product 11, that is, the shape of the outer surface 12 is designed using a three-dimensional CAD system. As a result, three-dimensional shape information of the sintered product 11 is defined by the three-dimensional CAD system. Next, the outer resin mold 1 shown in FIG. 1 is prepared. For this, a light curing molding method is used.
光硬化造形法は、 図 2に例示されるように液状の光硬化性樹脂 2の表面に強力 な紫外線 3を照射することにより、 照射された領域の樹脂 2を硬化させ、 これを 幾層にも積層することにより 3次元の樹脂硬化像 1を創成するものである。 得ら れる形状はレーザ光 3の軌跡により決定される。  In the photo-curing molding method, as shown in Fig. 2, the surface of a liquid photo-curable resin 2 is irradiated with strong ultraviolet rays 3, thereby curing the resin 2 in the irradiated area, and forming this into several layers. The three-dimensional resin cured image 1 is created by laminating the resin. The obtained shape is determined by the trajectory of the laser beam 3.
すなわち、 図 2に模式的に示されるように、 槽内に満たされた光硬化性樹脂 2 の表面にレーザ光 3のスポットを当てて、 スキャナ 5によってレーザ光 3を 2次 元的に移動することにより表面の一部が固体化される。 その後、 固体化したもの を一層の厚み分だけステ一ジ 4により液面より沈下させ、 固体化した部分の上に —層分の液状の樹脂 2を導入する。 次にこの液状部が同様に固化される。 この固 ィ匕像は下層の固化像上に積層されて一体化される。 これを繰り返して一層づっ重 ねられる。  That is, as schematically shown in FIG. 2, a spot of the laser beam 3 is applied to the surface of the photo-curable resin 2 filled in the tank, and the laser beam 3 is two-dimensionally moved by the scanner 5. Thereby, a part of the surface is solidified. Then, the solidified material is settled from the liquid surface by the thickness of one layer by the stage 4, and the liquid resin 2 of one layer is introduced on the solidified portion. Next, the liquid portion is similarly solidified. This solid image is laminated and integrated on the lower solidified image. By repeating this, you can add more layers.
この場合、一層の断面の輪郭内部を全域照射すれば、 中実の樹脂像が造形され、 輪郭のみを照射すれば、輪郭のみが固化されて内部は未硬化の中空の樹脂像が作 成される。 なお、 中空の樹脂像を造形したときは、造形終了時に内部空間に未硬 化樹脂が充填されているが、小さな孔を開けることにより排出される。  In this case, irradiating the entire inside of the outline of the one-layer cross section creates a solid resin image, and irradiating only the outline solidifies only the outline and creates an uncured hollow resin image inside. You. When a hollow resin image is formed, the unhardened resin is filled in the internal space at the end of the formation, but is discharged by making a small hole.
本実施例では、 3次元 C A Dシステムのデータに基づいてセラミック焼結品 1 1の輪郭外部に対応する部分のみを照射し、 外皮樹脂成形型 1を造形する。 この 結果、 外皮樹脂成形型 1の内表面 7は焼結品 1 1の外表面 1 2に一致したものと なる。  In the present embodiment, based on the data of the three-dimensional CAD system, only the portion corresponding to the outside of the outline of the ceramic sintered product 11 is irradiated, and the outer resin molding die 1 is formed. As a result, the inner surface 7 of the outer resin molding die 1 coincides with the outer surface 12 of the sintered product 11.
なお、 この外皮樹脂成形型 1はその内表面 7にのみ意義があるので、 外皮 6の 外側はハニカム構造等で補強されていてもよい。  Since the outer resin mold 1 has significance only on the inner surface 7, the outer side of the outer shell 6 may be reinforced with a honeycomb structure or the like.
図 1に示されるように、 作成された外皮樹脂成形型 1は外皮 6によつて構成さ れ、上部が開口して凹部 8が形成された略箱状である。 また、 この樹脂成形型 1 の凹部 8側にある内表面 7は焼結品 1 1の外表面 1 2に一致している。 すなわち、 凹部 8の形状は焼結品 1 1の外形形状と同一となっている。 As shown in FIG. 1, the formed outer resin mold 1 is composed of an outer shell 6 and has a substantially box shape in which an upper portion is opened and a concave portion 8 is formed. The inner surface 7 of the resin mold 1 on the side of the concave portion 8 coincides with the outer surface 12 of the sintered product 11. That is, The shape of the recess 8 is the same as the outer shape of the sintered product 11.
このようにして光硬化造形法で外皮樹脂成形型 1力一挙に作成されるので、 成 形型の作成工程が大幅に単純化される。  In this manner, the outer resin molding die is formed at a stroke by the photo-curing molding method, so that the forming die forming process is greatly simplified.
(2) 次に、 図 3に示すようにこの外皮樹脂成形型 1に焼結材 9が充填される。 通常、 焼結材 9は水と解膠剤が加えられることにより流動化されている。 焼結材 9力充填されて凹部 8を満たした後、 この成形型 1ごと乾燥器あるいは予熱炉内 に置いて、 所定の温度 （約 3 0 0 °C) で所定の時間乾燥される。  (2) Next, as shown in FIG. 3, the outer shell resin mold 1 is filled with a sintered material 9. Normally, the sintered material 9 is fluidized by adding water and a deflocculant. After the concave portion 8 is filled with the sintered material 9 by force, the mold 1 is placed in a dryer or a preheating furnace and dried at a predetermined temperature (about 300 ° C.) for a predetermined time.
この乾燥工程により、焼結材 9中の水分が蒸発し、 焼結材 9に保形性が与えら れる。 この乾燥工程の間、 外皮樹脂成形型 1は形状を維持する。 このため、 乾燥 工程が終了すると、 外皮樹脂成形型 1の内表面 7の形状に一致した外形形状を保 持した焼結材 9が外皮樹脂成形型 1内に作られる。  By this drying step, moisture in the sintered material 9 evaporates, and the sintered material 9 is given shape retention. During this drying step, the outer resin mold 1 maintains its shape. For this reason, when the drying process is completed, a sintered material 9 having an outer shape that matches the shape of the inner surface 7 of the outer resin molding die 1 is formed in the outer resin molding die 1.
(3) 次に、 図 4に示されているように、 乾燥された焼結材 9が成形型 1ととも に高温炉 (6 0 0 °C) に投入される。 この焼結工程の早い時期に、 外皮樹脂成形 型 1を構成する樹脂 2は焼失する。 この焼失に先立ち、 樹脂 2は加熱膨張する。 し力、し、 外皮樹脂成形型 1が中実でなく外皮構造であるため、 この加熱膨張によ る応力は小さく、 焼結材 9側に過大な力を作用させることがない。 したがって、 図 4に示される溝部 1 3等、 応力の集中しやすいところでも、 亀裂が生じない。 また、 樹 fl旨の気化ガス力少量であり、作業環境あるいは焼結炉内部の汚染も少な い。  (3) Next, as shown in FIG. 4, the dried sintered material 9 is put together with the mold 1 into a high-temperature furnace (600 ° C.). At an early stage of the sintering process, the resin 2 constituting the outer resin mold 1 is burned off. Prior to this burning, the resin 2 expands by heating. Since the outer resin molding die 1 is not solid but has an outer shell structure, the stress due to this thermal expansion is small, and no excessive force acts on the sintered material 9 side. Therefore, cracks do not occur even in places where stress tends to concentrate, such as the groove 13 shown in FIG. In addition, the vaporizing gas power of the flour is small, and there is little contamination in the working environment or inside the sintering furnace.
外皮樹脂成形型 1の焼失後、 さらに加熱力続けられ、 焼結材 9は完全に焼結さ れ、 設計された焼結品 1 1力完成する。  After burning of the outer resin mold 1, the heating force is further continued, and the sintered material 9 is completely sintered, and the designed sintered product 11 is completed.
本実施例では、 焼結品としてセラミックス製品 1 1を例示して説明した力 焼 結によって製造され得るものであれば、 セラミックス製品に限らず本発明を適用 することができる。 例えば、 焼結によって硬化する粉末金属等を焼結材として使 用できる。  In the present embodiment, the present invention is not limited to ceramic products, and the present invention can be applied as long as it can be manufactured by force sintering described as an example of the ceramic product 11 as a sintered product. For example, powdered metal that hardens by sintering can be used as the sintering material.
また、 製造される物は最終製品に限らず、 部品あるいは型であってもよい。 上述したように、 本発明によれば、 3次元 C A Dデータから光硬化造形法によ つて外皮樹脂成形型力一挙に作成される。 したがって、焼結品の製造を短期間に かつ、 低コストで行うことができる。 さらに、外皮樹脂成形型の形状自由度力大 きいため、 複雑な形状の焼結品を容易に製造することができる < Also, the manufactured product is not limited to the final product, but may be a part or a mold. As described above, according to the present invention, the outer resin molding die force is created at once from the three-dimensional CAD data by the photo-curing molding method. Therefore, the production of a sintered product can be performed in a short period of time and at low cost. In addition, the shape flexibility of the outer resin mold is large. Therefore, sintered products with complicated shapes can be easily manufactured <

Claims

請 求 の 範 囲 The scope of the claims
1. 焼結材を成形型に充填し、 成形された焼結材を焼結して焼結品を製造する 方法であり、 1. A method of filling a mold with a sintered material and sintering the molded sintered material to produce a sintered product.
製造する焼結品の外表面に一致する内表面を有する外皮樹脂成形型を光硬化造 形法に従つて作成する工程と、  Forming a skin resin mold having an inner surface corresponding to the outer surface of the sintered product to be manufactured in accordance with a light curing molding method;
焼結材を該外皮樹脂成形型の該内表面側に充填する工程と、  Filling a sintered material on the inner surface side of the outer resin mold,
成形された焼結材を焼結する工程、  Sintering the formed sintered material,
とを有することを特徴とする外皮樹脂成形型を用 L、る焼結品製造方法。 A method for producing a sintered product using a skin resin mold, characterized by having:
2. 請求の範囲 1に記載の焼結品製造方法であり、  2. A method for producing a sintered product according to claim 1,
前記外皮樹脂成形型の外表面側が 、二力ム構造で補強されている。 '  The outer surface side of the outer resin mold is reinforced with a two-stroke structure. '
PCT/JP1993/000488 1991-11-08 1993-04-15 Sintered product manufacturing method using resin shell mold WO1994024067A1 (en)

Priority Applications (2)

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JP3321226A JP2585492B2 (en) 1991-11-08 1991-11-08 Method for producing sintered product using outer resin mold
PCT/JP1993/000488 WO1994024067A1 (en) 1991-11-08 1993-04-15 Sintered product manufacturing method using resin shell mold

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JP3321226A JP2585492B2 (en) 1991-11-08 1991-11-08 Method for producing sintered product using outer resin mold
PCT/JP1993/000488 WO1994024067A1 (en) 1991-11-08 1993-04-15 Sintered product manufacturing method using resin shell mold

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US10697305B2 (en) * 2016-01-08 2020-06-30 General Electric Company Method for making hybrid ceramic/metal, ceramic/ceramic body by using 3D printing process
CN114393751B (en) * 2022-03-22 2022-05-27 中车戚墅堰机车车辆工艺研究所有限公司 Mold preparation method, mold and rail vehicle connecting piece

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JPS59184605A (en) * 1983-04-06 1984-10-20 株式会社ヤクルト本社 Manufacture of relief decorative board
JPH02169145A (en) * 1988-12-22 1990-06-29 Nkk Corp Collapsible mold

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JPS59184605A (en) * 1983-04-06 1984-10-20 株式会社ヤクルト本社 Manufacture of relief decorative board
JPH02169145A (en) * 1988-12-22 1990-06-29 Nkk Corp Collapsible mold

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8108982B2 (en) 2005-01-18 2012-02-07 Floodcooling Technologies, L.L.C. Compound mold tooling for controlled heat transfer

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JP2585492B2 (en) 1997-02-26

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