JP2010076294A - Isostatic pressing die - Google Patents

Isostatic pressing die Download PDF

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JP2010076294A
JP2010076294A JP2008247996A JP2008247996A JP2010076294A JP 2010076294 A JP2010076294 A JP 2010076294A JP 2008247996 A JP2008247996 A JP 2008247996A JP 2008247996 A JP2008247996 A JP 2008247996A JP 2010076294 A JP2010076294 A JP 2010076294A
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lid
molding
rubber ring
cylindrical
cored bar
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Kenji Yonekura
健二 米倉
Hiromi Shimada
博己 嶋田
Makoto Koyama
誠 小山
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NGK Insulators Ltd
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NGK Insulators Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an isostatic pressing die enabling a cutting period of time of a cylindrical ceramic molding to be shortened by reducing a range to be cut during cutting after pressing, and forming the cylindrical ceramic molding having uniform density. <P>SOLUTION: The isostatic pressing die 100 is provided with: a columnar core metal 1; a lid portion 2 disposed on end 1a of the core metal 1; a bottom portion 3 disposed on the other end 1b of the core metal 1; and a cylindrical molding rubber die 4 disposed from the lit portion 2 to the bottom portion 3 so as to form a space between the die 4 and the core metal 1. The surface of the lid portion 2 facing the core metal 1 side and the surface of the bottom portion 3 facing the core metal 1 side are planes orthogonal to the core metal 1. The hydrostatic-pressure molding die 100 further includes a cylindrical bottom side rubber ring 7 disposed in contact with the bottom portion 3 and the inner surface 4a of the molding rubber die, and a cylindrical lid side rubber ring 8 disposed in contact with the lid portion 2 and the inner surface 4a of the molding rubber die. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、静水圧加圧成形型に関し、さらに詳しくは、加圧成形後の切削加工時に切削すべき範囲を、小さくすることにより切削時間を短縮し、更に、密度が均一な円筒状セラミック成形体を成形することができる静水圧加圧成形型に関する。   The present invention relates to an isostatic pressing mold, and more particularly, to reduce the cutting time by reducing the range to be cut at the time of cutting after pressure forming, and to form a cylindrical ceramic having a uniform density. The present invention relates to a hydrostatic pressure mold capable of molding a body.

碍管のような円筒形状のセラミック成形体を加圧成形する方法として、静水圧加圧成形(以下、「CIP成形」ということがある。)を挙げることができる。一般に、CIP成形は、粉末充填、加圧、減圧、成形体取り出しの各工程からなり、円筒形状のセラミック成形体の成形に好適に用いられる(例えば、非特許文献1参照)。   An example of a method for pressure forming a cylindrical ceramic molded body such as a soot tube is isostatic pressing (hereinafter also referred to as “CIP molding”). In general, CIP molding includes powder filling, pressurization, decompression, and molded body removal steps, and is suitably used for molding a cylindrical ceramic molded body (for example, see Non-Patent Document 1).

CIP成形により成形された円筒状セラミック成形体は、高電圧絶縁体部品である碍管として使用する場合、図3に示すように、円筒状の中央部22と、中央部22の外側面から外方に延伸する複数の鍔部23とを備える形状に切削加工される。碍管21は、鍔部23が、中央部22の一方の端部側に向かって傾斜するように形成されている。図3は、碍管21の中心軸を含む平面で切断した断面を示す模式図である。
P.J.James編、海江田義也訳、「HIPとCIP」、日刊工業新聞社、昭和61年8月22日、p99
When the cylindrical ceramic molded body formed by CIP molding is used as a soot tube which is a high-voltage insulator part, as shown in FIG. Are cut into a shape including a plurality of flanges 23 extending in a straight line. The soot tube 21 is formed such that the soot 23 is inclined toward one end side of the central portion 22. FIG. 3 is a schematic diagram showing a cross section cut along a plane including the central axis of the soot tube 21.
P. J. et al. Edited by James, translated by Yoshiya Kaieda, "HIP and CIP", Nikkan Kogyo Shimbun, August 22, 1986, p99

円筒状のセラミック成形体を切削加工し、図3に示すような碍管21を作製する場合、多くの範囲を切削加工する必要があるため製造時間が長くかかっていた。特に、両端部が、切削加工範囲が広く、切削加工に時間を要する部分であった。高電圧絶縁体部品である碍管は、表面漏洩距離を伸ばすため、複数の鍔部を有しているが、両端部に金具を取り付けるため、両端部には鍔部を形成することができず、広い範囲に亘って細い円筒形状にする必要がある。   When a cylindrical ceramic molded body is cut to produce a soot tube 21 as shown in FIG. 3, it takes a long manufacturing time because a large range needs to be cut. In particular, both end portions have a wide cutting range and are time-consuming portions. In order to increase the surface leakage distance, the soot tube which is a high voltage insulator part has a plurality of soot parts, but since the metal fittings are attached to both end parts, it is not possible to form the soot parts at both end parts. It is necessary to form a thin cylindrical shape over a wide range.

また、静水圧加圧成形型を用いて加圧成形する場合、円筒状セラミック成形体の端部が成形用ゴム型により十分に押圧されないため、円筒状セラミック成形体の端部の密度が低くなるという問題もあった。   In addition, when pressure molding is performed using a hydrostatic pressure molding die, the end portion of the cylindrical ceramic molded body is lowered because the end portion of the cylindrical ceramic molded body is not sufficiently pressed by the molding rubber mold. There was also a problem.

本発明は、このような従来技術の有する問題点に鑑みてなされたものであり、その目的とするところは、加圧成形後の切削加工時に切削すべき範囲を、小さくすることにより切削時間を短縮し、更に、密度が均一な円筒状セラミック成形体を成形することができる静水圧加圧成形型を提供することにある。   The present invention has been made in view of such problems of the prior art, and the object of the present invention is to reduce the cutting time by reducing the range to be cut during cutting after pressure molding. Another object of the present invention is to provide a hydrostatic pressure mold that can be shortened and can form a cylindrical ceramic molded body having a uniform density.

上記目的を達成するため、本発明によって以下の静水圧加圧成形型が提供される。   To achieve the above object, the present invention provides the following hydrostatic pressure mold.

[1] 円柱状の芯金と、前記芯金の一方の端部に着脱可能に配設された蓋部と、前記芯金の他方の端部に配設された底部と、前記芯金との間に空間を形成するように前記蓋部から前記底部に亘って配設された円筒状の成形用ゴム型とを備え、前記蓋部の前記芯金側を向く面と、前記底部の前記芯金側を向く面とが、いずれも前記芯金に直交する平面であり、前記底部及び成形用ゴム型の内表面に接し、前記芯金との間に空間を形成しながら前記芯金を内部に通すように配置された円筒形状の底部側ゴムリングと、前記蓋部及び成形用ゴム型の内表面に接し、前記芯金との間に空間を形成しながら前記芯金を内部に通すように配置された円筒形状の蓋部側ゴムリングとを更に備えた静水圧加圧成形型。 [1] A cylindrical cored bar, a lid part detachably disposed at one end of the cored bar, a bottom part disposed at the other end of the cored bar, the cored bar, A cylindrical molding rubber mold disposed from the lid portion to the bottom portion so as to form a space between the lid portion, a surface of the lid portion facing the core metal side, and the bottom portion The surface facing the cored bar is a plane perpendicular to the cored bar, and is in contact with the bottom and the inner surface of the molding rubber mold, while forming a space between the cored bar and the cored bar. The cored bar is passed through the cylindrical bottom rubber ring arranged so as to pass through the inside and the lid and the inner surface of the molding rubber mold while forming a space between the cored bar. A hydrostatic pressure molding die further provided with a cylindrical lid-side rubber ring arranged as described above.

[2] 前記底部側ゴムリングの中心軸方向の長さが、前記芯金の長さの5〜30%であり、前記蓋部側ゴムリングの中心軸方向の長さが、前記芯金の長さの5〜30%である[1]に記載の静水圧加圧成形型。 [2] The length in the central axis direction of the bottom rubber ring is 5 to 30% of the length of the metal core, and the length in the central axis direction of the lid rubber ring is the length of the metal core. The isostatic pressing mold according to [1], which is 5 to 30% of the length.

[3] 前記底部側ゴムリングの内周の直径が、前記成形用ゴム型の内周の直径の50〜95%であり、前記蓋部側ゴムリングの内周の直径が、前記成形用ゴム型の内周の直径の50〜95%である[1]又は[2]に記載の静水圧加圧成形型。 [3] The inner peripheral diameter of the bottom rubber ring is 50 to 95% of the inner peripheral diameter of the molding rubber mold, and the inner peripheral diameter of the lid rubber ring is the molding rubber. The hydrostatic pressure mold according to [1] or [2], which is 50 to 95% of the inner peripheral diameter of the mold.

このように、本発明の静水圧加圧成形型によれば、成形用ゴム型の内表面に接するように底部側ゴムリングと蓋部側ゴムリングとを備えるため、得られる円筒状セラミック成形体が、両端部が細く形成された円筒状の成形体になる。これにより、円筒状のセラミック成形体の切削加工を行う際に最も切削範囲の広い両端部を切削する必要がなく、切削時間を短縮することができる。更に、本発明の静水圧加圧成形型を用いて加圧成形すると、円筒状セラミック成形体の両端部が、成形用ゴム型の内側に配置された底部側ゴムリング及び蓋部側ゴムリングによりそれぞれ十分に押圧されるため、円筒状セラミック成形体の両端部の密度が低くなることを抑制することができる。   Thus, according to the hydrostatic pressure molding die of the present invention, the cylindrical ceramic molded body obtained is provided with the bottom side rubber ring and the lid side rubber ring so as to be in contact with the inner surface of the molding rubber die. However, it becomes a cylindrical molded body in which both end portions are formed thin. Thereby, it is not necessary to cut both ends with the widest cutting range when cutting the cylindrical ceramic molded body, and the cutting time can be shortened. Furthermore, when the hydrostatic pressure molding die of the present invention is used for pressure molding, both ends of the cylindrical ceramic molded body are formed by the bottom side rubber ring and the lid side rubber ring arranged inside the molding rubber mold. Since each is fully pressed, it can suppress that the density of the both ends of a cylindrical ceramic molded object becomes low.

次に本発明の実施の形態を図面を参照しながら詳細に説明するが、本発明は以下の実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で、当業者の通常の知識に基づいて、適宜設計の変更、改良等が加えられることが理解されるべきである。   Next, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and is within the scope of the present invention. Based on this knowledge, it should be understood that design changes, improvements, etc. can be made as appropriate.

本発明の静水圧加圧成形型の一の実施形態は、図1に示すように、円柱状の芯金1と、芯金1の一方の端部1aに着脱可能に配設された蓋部2と、芯金1の他方の端部1bに配設された底部3と、芯金1の外側を覆うとともに芯金1との間に空間(成形用空間)V1を形成するように蓋部2から底部3に亘って配設された円筒状の成形用ゴム型4と、成形用ゴム型4の外側を覆うように蓋部2から底部3に亘って配設され、複数の貫通孔6が形成された円筒状の孔付外筒部5とを備えるものである。そして、本実施形態の静水圧加圧成形型100は、更に、蓋部2の芯金1側を向く面(蓋部の内表面)2aと、底部3の芯金1側を向く面(底部の内表面)3aとが、いずれも芯金1に直交する平面である。更に、底部3及び成形用ゴム型4の内表面4aに接し、芯金1との間に空間を形成しながら芯金1を内部に通すように配置された円筒形状の底部側ゴムリング7と、蓋部2及び成形用ゴム型4の内表面4aに接し、芯金1との間に空間を形成しながら芯金1を内部に通すように配置された円筒形状の蓋部側ゴムリング8とを備えるものである。図1は、本発明の静水圧加圧成形型の一実施形態の、中心軸を含む平面で切断した断面を示す模式図である。   As shown in FIG. 1, one embodiment of the hydrostatic pressure molding die of the present invention is a cylindrical cored bar 1 and a lid part detachably disposed on one end 1 a of the cored bar 1. 2 and a bottom part 3 disposed at the other end 1b of the cored bar 1 and a cover part so as to cover the outside of the cored bar 1 and to form a space (forming space) V1 between the cored bar 1 A cylindrical molding rubber mold 4 disposed from 2 to the bottom 3 and a plurality of through holes 6 disposed from the lid 2 to the bottom 3 so as to cover the outside of the molding rubber mold 4. The cylindrical outer cylinder part 5 with a hole in which is formed. The hydrostatic pressure molding die 100 of the present embodiment further includes a surface (inner surface of the lid portion) 2a facing the core metal 1 side of the lid portion 2 and a surface (bottom portion) facing the core metal 1 side of the bottom portion 3. The inner surface 3a is a plane orthogonal to the cored bar 1. Furthermore, a cylindrical bottom rubber ring 7 disposed so as to pass through the core metal 1 while forming a space between the bottom part 3 and the inner surface 4a of the molding rubber mold 4 and forming a space between the core metal 1 and A cylindrical lid-side rubber ring 8 arranged so as to pass through the core metal 1 while being in contact with the lid 2 and the inner surface 4a of the molding rubber mold 4 and forming a space between the core metal 1 Are provided. FIG. 1 is a schematic view showing a cross section of an embodiment of the hydrostatic pressure molding die of the present invention cut along a plane including a central axis.

本実施形態の静水圧加圧成形型100を用いて、例えば円筒形状の碍管を成形する場合、まず、蓋部2を開け、蓋部側ゴムリング8をはずした状態で、セラミック粉末を成形用空間V1の、蓋部側ゴムリング8を配置したときの最下部に相当する位置まで充填し、その後蓋部側ゴムリング8を配置し、その後に、残りの空間にセラミック粉末を充填し、その後、蓋部2を閉める。その後、静水圧加圧成形型100を圧力容器9内に入れ、圧力容器9内に加圧媒体を圧入し、成形用ゴム型4を中心軸方向に押圧することにより、セラミック粉末を圧縮成形して円筒形状の成形体を得ることができる。その後、加圧媒体を圧力容器9内から外部に流出させ、成形用ゴム型4を復元させて、成形用空間V1内を常圧に戻し、円筒形状の成形体を取り出す。このとき、得られた円筒形状のセラミック成形体11は、図2に示すように、底部側ゴムリング及び蓋部側ゴムリングにより、両端部12,12が他の部分13よりも細く形成されたものとなる。図2は、本実施形態の静水圧加圧成形型100により成形された円筒状のセラミック成形体の、中心軸を含む平面で切断した断面を示す模式図である。加圧媒体としては、防食及び潤滑性の添加剤の入った水等を使用することができる。また、加圧媒体を圧入するときの圧力は50〜200MPaであることが好ましい。50MPaより低いと、十分に圧縮成形できないことがあり、200MPaより高いと、装置に負担がかかりすぎることがある。加圧媒体は加圧ポンプによって供給される。また、本実施形態の静水圧加圧成形型100を用いて成形される円筒状のセラミック成形体の材料であるセラミック粉末としては、陶石、長石、粘土等の碍子原料を微粉砕したセラミック粉末を挙げることができる。環境問題等を考慮すると有機バインダー等を用いないことが好ましい。   For example, when forming a cylindrical tub tube using the hydrostatic pressure molding die 100 of the present embodiment, first, the lid 2 is opened, and the ceramic powder is molded with the lid-side rubber ring 8 removed. The space V1 is filled up to a position corresponding to the lowermost part when the lid part side rubber ring 8 is arranged, and then the lid part side rubber ring 8 is arranged, and then the remaining space is filled with ceramic powder, and then Then, the lid 2 is closed. Thereafter, the hydrostatic pressure molding die 100 is placed in the pressure vessel 9, a pressure medium is pressed into the pressure vessel 9, and the molding rubber die 4 is pressed in the direction of the central axis to compress the ceramic powder. Thus, a cylindrical shaped body can be obtained. Thereafter, the pressurized medium is caused to flow out from the inside of the pressure vessel 9, the molding rubber mold 4 is restored, the molding space V1 is returned to normal pressure, and the cylindrical molded body is taken out. At this time, as shown in FIG. 2, the obtained cylindrical ceramic molded body 11 was formed such that both end portions 12 and 12 were narrower than the other portion 13 by the bottom side rubber ring and the lid side rubber ring. It will be a thing. FIG. 2 is a schematic view showing a cross section of a cylindrical ceramic molded body formed by the hydrostatic pressure mold 100 of the present embodiment, cut along a plane including the central axis. As the pressurizing medium, water containing an anticorrosive and lubricating additive can be used. Moreover, it is preferable that the pressure when press-fitting a pressurizing medium is 50 to 200 MPa. When the pressure is lower than 50 MPa, compression molding may not be performed sufficiently. When the pressure is higher than 200 MPa, the apparatus may be overloaded. The pressurizing medium is supplied by a pressurizing pump. In addition, as the ceramic powder that is a material of the cylindrical ceramic molded body formed using the hydrostatic pressure mold 100 of the present embodiment, ceramic powder obtained by finely pulverizing an insulator raw material such as ceramic stone, feldspar, clay, etc. Can be mentioned. In view of environmental problems, it is preferable not to use an organic binder or the like.

このように、本実施形態の静水圧加圧成形型100によれば、成形用ゴム型の内表面4aに接するように底部側ゴムリング7と蓋部側ゴムリング8とを備えるため、加圧成形時に、円筒状のセラミック成形体の両端部を底部側ゴムリング7及び蓋部側ゴムリング8がそれぞれ押圧するため、得られる円筒状セラミック成形体が、両端部が細く形成されたものになる。これにより、円筒状のセラミック成形体の切削加工を行う際に最も切削範囲の広い両端部分を切削する必要がなく、切削時間を短縮することができる。更に、本実施形態の静水圧加圧成形型100を用いて加圧成形すると、円筒状セラミック成形体の両端部が、成形用ゴム型4の内側に配置された底部側ゴムリング7及び蓋部側ゴムリング8によりそれぞれ十分に押圧されるため、円筒状セラミック成形体の両端部の密度が低くなることを抑制することができる。また、蓋部2の芯金1側を向く面(蓋部の内表面)2aと、底部3の芯金1側を向く面(底部の内表面)3aとが、いずれも芯金1に直交する平面であるため、得られる円筒形状の成形体が、両端面が平行、且つ円筒形状の内周面と直交する形状となる。これにより、優れた高電圧絶縁体部品である碍管(円筒状のセラミック成形体)を形成することが可能となる。   Thus, according to the hydrostatic pressure molding die 100 of the present embodiment, the bottom side rubber ring 7 and the lid side rubber ring 8 are provided so as to be in contact with the inner surface 4a of the molding rubber mold. At the time of molding, both ends of the cylindrical ceramic molded body are pressed by the bottom rubber ring 7 and the lid rubber ring 8 respectively, so that the obtained cylindrical ceramic molded body is formed with both ends narrow. . Thereby, it is not necessary to cut both end portions with the widest cutting range when cutting the cylindrical ceramic molded body, and the cutting time can be shortened. Furthermore, when pressure molding is performed using the hydrostatic pressure molding die 100 of the present embodiment, both ends of the cylindrical ceramic molded body are provided with the bottom rubber ring 7 and the lid portion disposed inside the molding rubber mold 4. Since each side rubber ring 8 is sufficiently pressed, it can suppress that the density of the both ends of a cylindrical ceramic molded object becomes low. Also, the surface 2a of the lid 2 facing the core 1 (the inner surface of the lid) and the surface 3a of the bottom 3 facing the core 1 (the inner surface of the bottom) 3a are all orthogonal to the core 1 Therefore, the obtained cylindrical molded body has a shape in which both end faces are parallel and orthogonal to the cylindrical inner peripheral surface. This makes it possible to form a soot tube (cylindrical ceramic molded body) that is an excellent high-voltage insulator part.

本実施形態の静水圧加圧成形型100においては、円筒状の底部側ゴムリング7が、底部3及び成形用ゴム型の内表面4aに接し、芯金1との間に空間を形成しながら芯金1を内部に通すように配置されている。そのため、底部側ゴムリング7の外径は、成形用ゴム型4の内径より若干小さいことが好ましい。具体的には、底部側ゴムリング7の外径は、成形用ゴム型4の内径をD(mm)としたときに、D−1〜D−2(mm)であることが好ましい。D−2(mm)より小さいと、底部側ゴムリング7と成形用ゴム型4との間にセラミック粉末が入り込むため、所望の形状が得られないことがある。また、D−1(mm)より大きいと、底部側ゴムリング7が、成形用ゴム型4の内側に入らないことがある。また、底部側ゴムリング7の内径(内周の直径)は、成形用ゴム型4の内径(内周の直径)に対して、50〜95%であることが好ましい。50%より小さいと、得られる円筒状のセラミック成形体の端部の中心軸に直交する断面の直径が、所望の大きさとならないことがあり、95%より大きいと、底部側ゴムリングによる、円筒状セラミック成形体の密度を均一にする効果が、小さくなることがある。また、底部側ゴムリング7は、芯金1と同軸になるように配置されることが好ましい。   In the hydrostatic pressure molding die 100 of the present embodiment, the cylindrical bottom rubber ring 7 is in contact with the bottom 3 and the inner surface 4a of the molding rubber mold while forming a space between the core metal 1. It arrange | positions so that the metal core 1 may be penetrated inside. Therefore, the outer diameter of the bottom rubber ring 7 is preferably slightly smaller than the inner diameter of the molding rubber mold 4. Specifically, the outer diameter of the bottom rubber ring 7 is preferably D-1 to D-2 (mm) when the inner diameter of the molding rubber mold 4 is D (mm). If it is smaller than D-2 (mm), the ceramic powder enters between the bottom rubber ring 7 and the molding rubber mold 4, so that a desired shape may not be obtained. Moreover, when larger than D-1 (mm), the bottom part side rubber ring 7 may not enter inside the rubber mold 4 for a shaping | molding. The inner diameter (inner diameter) of the bottom rubber ring 7 is preferably 50 to 95% of the inner diameter (inner diameter) of the molding rubber mold 4. If it is less than 50%, the diameter of the cross section perpendicular to the central axis of the end portion of the obtained cylindrical ceramic molded body may not be a desired size. If it is more than 95%, the cylinder is formed by the bottom rubber ring. The effect of making the density of the shaped ceramic molded body uniform may be reduced. The bottom rubber ring 7 is preferably arranged so as to be coaxial with the core metal 1.

また、底部側ゴムリング7の中心軸方向の長さは、成形される円筒状のセラミック成形体の、外径が細くなった端部の中心軸方向の長さに応じて適宜決定することができる。例えば、芯金1の長さの5〜30%であることが好ましい。   Further, the length in the central axis direction of the bottom rubber ring 7 can be appropriately determined according to the length in the central axis direction of the end portion of the cylindrical ceramic molded body to be formed with a reduced outer diameter. it can. For example, 5 to 30% of the length of the cored bar 1 is preferable.

本実施形態の静水圧加圧成形型100においては、円筒状の蓋部側ゴムリング8が、蓋部2及び成形用ゴム型の内表面4aに接し、芯金1との間に空間を形成しながら芯金1を内部に通すように配置されている。そのため、蓋部側ゴムリング8の外径は、成形用ゴム型4の内径より若干小さいことが好ましい。具体的には、蓋部側ゴムリング8の外径は、成形用ゴム型4の内径をD(mm)としたときに、D−1〜D−2(mm)であることが好ましい。D−2(mm)より小さいと、蓋部側ゴムリング8と成形用ゴム型4との間にセラミック粉末が入り込むため、所望の形状が得られないことがある。また、D−1(mm)より大きいと、蓋部側ゴムリング8が、成形用ゴム型4の内側に入らないことがある。また、蓋部側ゴムリング8の内径(内周の直径)は、成形用ゴム型4の内径(内周の直径)に対して、50〜95%であることが好ましい。50%より小さいと、得られる円筒状のセラミック成形体の端部の中心軸に直交する断面の直径が、所望の大きさとならないことがあり、95%より大きいと、蓋部側ゴムリング8による、円筒状セラミック成形体の密度を均一にする効果が、小さくなることがある。蓋部側ゴムリング8は、芯金1と同軸になるように配置されることが好ましい。   In the hydrostatic pressure molding die 100 of the present embodiment, the cylindrical lid-side rubber ring 8 is in contact with the lid 2 and the inner surface 4a of the molding rubber mold to form a space between the core metal 1. However, it arrange | positions so that the metal core 1 may be penetrated inside. Therefore, it is preferable that the outer diameter of the lid-side rubber ring 8 is slightly smaller than the inner diameter of the molding rubber mold 4. Specifically, the outer diameter of the lid-side rubber ring 8 is preferably D-1 to D-2 (mm) when the inner diameter of the molding rubber mold 4 is D (mm). If it is smaller than D-2 (mm), the ceramic powder enters between the lid portion side rubber ring 8 and the molding rubber mold 4, so that a desired shape may not be obtained. Moreover, when larger than D-1 (mm), the cover part side rubber ring 8 may not enter the inside of the rubber mold 4 for a shaping | molding. Further, the inner diameter (inner diameter) of the lid-side rubber ring 8 is preferably 50 to 95% with respect to the inner diameter (inner diameter) of the molding rubber mold 4. If it is less than 50%, the diameter of the cross section perpendicular to the central axis of the end portion of the obtained cylindrical ceramic molded body may not be a desired size. The effect of making the density of the cylindrical ceramic molded body uniform may be reduced. The lid-side rubber ring 8 is preferably arranged so as to be coaxial with the cored bar 1.

また、蓋部側ゴムリング8の中心軸方向の長さは、成形される円筒状のセラミック成形体の、外径が細くなった端部の中心軸方向の長さに応じて適宜決定することができる。例えば、芯金1の長さの5〜30%であることが好ましい。   The length of the lid-side rubber ring 8 in the central axis direction is appropriately determined according to the length of the cylindrical ceramic molded body to be molded in the direction of the central axis of the end portion with a reduced outer diameter. Can do. For example, 5 to 30% of the length of the cored bar 1 is preferable.

底部側ゴムリング7及び蓋部側ゴムリング8の、中心軸方向における両端面は、中心軸に直交する平面であることが好ましい。また、底部側ゴムリング7及び蓋部側ゴムリング8の内表面は滑らかな面であることが好ましい。   It is preferable that both end surfaces of the bottom side rubber ring 7 and the lid side rubber ring 8 in the central axis direction are planes orthogonal to the central axis. The inner surfaces of the bottom rubber ring 7 and the lid rubber ring 8 are preferably smooth surfaces.

底部側ゴムリング7及び蓋部側ゴムリング8の材質としては、天然ゴム等を挙げることができる。   Examples of the material of the bottom rubber ring 7 and the lid rubber ring 8 include natural rubber.

本実施形態の静水圧加圧成形型100においては、芯金1の長さ及び中心軸に直交する断面の直径は、作製する円筒状の成形体の大きさに合わせて適宜決定することができ、例えば、500〜4000mmのものを好適に用いることができる。また、芯金1の材質は、普通鋼のような金属材質が好ましい。   In the hydrostatic pressure molding die 100 of the present embodiment, the length of the core metal 1 and the diameter of the cross section perpendicular to the central axis can be appropriately determined according to the size of the cylindrical molded body to be produced. For example, the thing of 500-4000 mm can be used suitably. Moreover, the material of the metal core 1 is preferably a metal material such as ordinary steel.

本実施形態の静水圧加圧成形型100においては、蓋部2及び底部3は、円盤状であり、且つ、互いに対向する面(蓋部の内表面2aと底部の内表面3a)が平面状であることが好ましい。また、蓋部2及び底部3は、図1に示すように、成形用ゴム型4及び孔付外筒部5を備えるため、円盤形状に対して段差が形成されるように加工されたものが好ましい。そして、図1に示すように、段差部分に、成形用ゴム型4を嵌め込むことが好ましい。また、蓋部2及び底部3は、それぞれ複数の円盤状部材を積層したものであってもよい。また、蓋部2及び底部3は、それぞれの中心が、芯金1の中心軸上に、位置するように配置されることが好ましい。蓋部2及び底部3の厚さ及び外径は、作製する円筒状の成形体の大きさに合わせて適宜決定することができる。蓋部2及び底部3の材質は、普通鋼のような金属材質が好ましい。   In the hydrostatic pressure molding die 100 of the present embodiment, the lid 2 and the bottom 3 are disk-shaped, and the surfaces facing each other (the inner surface 2a of the lid and the inner surface 3a of the bottom) are planar. It is preferable that Further, as shown in FIG. 1, the lid portion 2 and the bottom portion 3 are provided with a molding rubber mold 4 and an outer cylinder portion 5 with a hole, so that a step is formed with respect to the disk shape. preferable. And as shown in FIG. 1, it is preferable to insert | mold the rubber mold 4 for shaping | molding in the level | step-difference part. Moreover, the cover part 2 and the bottom part 3 may each be a laminate of a plurality of disk-shaped members. The lid 2 and the bottom 3 are preferably arranged such that their centers are located on the central axis of the cored bar 1. The thickness and outer diameter of the lid part 2 and the bottom part 3 can be appropriately determined according to the size of the cylindrical molded body to be produced. The material of the lid 2 and the bottom 3 is preferably a metal material such as ordinary steel.

図1に示すように、本実施形態の静水圧加圧成形型100においては、成形用ゴム型4は、円筒状であり、芯金1の外側を覆うとともに芯金1との間に空間(成形用空間)V1を形成するように蓋部2から底部3に亘って配設される。成形用空間V1は、成形用ゴム型4、芯金1、蓋部2及び底部3により囲まれて形成される空間である。成形用ゴム型4は、圧力媒体により外周側から押圧され、円筒内部の空間側(成形用空間V1側)に凹むように変形し、成形用空間V1内を加圧する。これにより、成形用空間V1内に充填されたセラミック粉末が円筒状に成形される。このとき、底部側ゴムリング7及び蓋部側ゴムリング8が配置されるセラミック成形体の両端部は、他の部分より細く形成される。成形用ゴム型4の長さは、図1に示すように、蓋部2及び底部3の両方に固定できる長さであれば特に限定されない。また、成形用ゴム型4の外径は、作製する円筒状のセラミック成形体の大きさに合わせて適宜決定することができる。成形用ゴム型4の肉厚は、5〜30mmが好ましい。成形用ゴム型4の材質は、天然ゴム等を挙げることができる。成形用ゴム型4を蓋部2及び底部3に取り付けるときには、固定バンドで締め付ける方法で取り付けることが好ましい。   As shown in FIG. 1, in the hydrostatic pressure molding die 100 of the present embodiment, the molding rubber die 4 has a cylindrical shape, covers the outside of the core metal 1, and has a space ( (Forming space) V1 is disposed from the lid portion 2 to the bottom portion 3 so as to form V1. The molding space V <b> 1 is a space formed by being surrounded by the molding rubber mold 4, the core metal 1, the lid portion 2, and the bottom portion 3. The molding rubber mold 4 is pressed from the outer peripheral side by the pressure medium, deforms so as to be recessed toward the space inside the cylinder (molding space V1 side), and pressurizes the molding space V1. Thereby, the ceramic powder filled in the forming space V1 is formed into a cylindrical shape. At this time, both ends of the ceramic molded body on which the bottom side rubber ring 7 and the lid side rubber ring 8 are arranged are formed to be narrower than the other parts. The length of the molding rubber mold 4 is not particularly limited as long as it can be fixed to both the lid 2 and the bottom 3 as shown in FIG. Further, the outer diameter of the molding rubber mold 4 can be appropriately determined according to the size of the cylindrical ceramic molded body to be produced. The thickness of the molding rubber mold 4 is preferably 5 to 30 mm. Examples of the material of the molding rubber mold 4 include natural rubber. When the molding rubber mold 4 is attached to the lid portion 2 and the bottom portion 3, it is preferably attached by a method of fastening with a fixing band.

本実施形態の静水圧加圧成形型100は、鍔部の外径250〜600mm、中央部の外径250〜600mm、高さ500〜4000mmの、図3に示すような、円筒状の碍管21を製造するのに好適に用いることができる。   The hydrostatic pressure molding die 100 of the present embodiment has a cylindrical soot tube 21 as shown in FIG. 3 having an outer diameter of 250 to 600 mm at the flange, an outer diameter of 250 to 600 mm at the center, and a height of 500 to 4000 mm. Can be suitably used to produce

本実施形態の静水圧加圧成形型100の製造方法は特に限定されず、公知の金属加工方法、ゴム成形方法及びこれらの組み立て方法により製造することができる。   The manufacturing method of the hydrostatic pressure molding die 100 of the present embodiment is not particularly limited, and can be manufactured by a known metal processing method, rubber molding method, and these assembling methods.

以下、本発明を実施例により具体的に説明するが、本発明はこれら実施例に限定されるものではない。   EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

(実施例1)
長さ780mm×直径90mmの円柱状の芯金の一方の端部に、直径300mmの円盤状の蓋部を配置し、芯金の他方の端部に直径300mmの円盤状の底部を配置し、長さ170mm×内径190mm(肉厚55mm)の底部側ゴムリングを芯金と同軸になるようにして底部の内表面に配置し、長さ170mm×内径190mm(肉厚55mm)の蓋部側ゴムリングを芯金と同軸になるようにして蓋部の内表面に接する位置に配置し、芯金との間に空間を形成して蓋部から底部に亘るように、内径300mm(肉厚15mm)の円筒状の成形用ゴム型を、固定バンドで締め付ける方法で蓋部及び底部に固定し、図1に示すような静水圧加圧成形型を作製した。蓋部は着脱可能にするため、芯金には固定せず、底部は、ボルト締めで芯金に固定した。また、蓋部の内表面及び底部の内表面が、いずれも芯金に直交する平面であった。芯金、蓋部、底部及び外筒部の材質は、普通鋼とした。また、成形用ゴム型の材質は、天然ゴムとした。また、底部側ゴムリング及び蓋部側ゴムリングの材質は、天然ゴムとした。以下の方法で、円筒状のセラミック成形体を作成し、成形体密度評価及び切削加工評価を行った。成形体密度評価の結果を表1に示し、切削加工評価の結果を表2に示す。
Example 1
A disc-shaped lid having a diameter of 300 mm is disposed at one end of a columnar core having a length of 780 mm and a diameter of 90 mm, and a disc-shaped bottom having a diameter of 300 mm is disposed at the other end of the core. A bottom rubber ring with a length of 170 mm x inner diameter of 190 mm (thickness 55 mm) is arranged on the inner surface of the bottom so as to be coaxial with the core metal, and a lid side rubber with a length of 170 mm x inner diameter 190 mm (thickness 55 mm) Arrange the ring so that it is coaxial with the cored bar and contact the inner surface of the lid part, forming a space between the cored bar and extending from the lid part to the bottom part, inner diameter 300mm (thickness 15mm) The cylindrical molding rubber mold was fixed to the lid and the bottom by a method of tightening with a fixing band, and a hydrostatic pressure molding mold as shown in FIG. 1 was produced. In order to make the lid part detachable, it was not fixed to the core metal, and the bottom part was fixed to the core metal by bolting. Moreover, both the inner surface of the cover part and the inner surface of the bottom part were planes orthogonal to the cored bar. The material of the cored bar, the lid part, the bottom part, and the outer cylinder part was ordinary steel. The material of the molding rubber mold was natural rubber. The material of the bottom side rubber ring and the lid side rubber ring was natural rubber. A cylindrical ceramic molded body was prepared by the following method, and the molded body density evaluation and the cutting work evaluation were performed. The results of the compact density evaluation are shown in Table 1, and the results of the cutting evaluation are shown in Table 2.

(円筒状のセラミック成形体作製)
静水圧加圧成形型を、底部を下にして配置し、静水圧加圧成形型の蓋部を開け、蓋部側ゴムリングを外した状態で、陶石、長石、及び粘土を含有するセラミック粉末を成形用空間に充填し、蓋部側ゴムリングを装着し、蓋部を閉じて、加圧媒体である水を、加圧用空間に100MPaで圧入し、セラミック粉末を成形して円筒状のセラミック成形体を得た。得られた円筒状のセラミック成形体は、外径240mm、内径90mm、高さ785mmの円筒状であった。
(Cylindrical ceramic body production)
A ceramic containing pottery stone, feldspar, and clay in a state where the hydrostatic pressure mold is placed with the bottom facing down, the lid of the hydrostatic pressure mold is opened, and the lid-side rubber ring is removed. Fill the molding space with the powder, attach the lid rubber ring, close the lid, pressurize the pressure medium with water at 100 MPa, mold the ceramic powder, A ceramic molded body was obtained. The obtained cylindrical ceramic molded body had a cylindrical shape with an outer diameter of 240 mm, an inner diameter of 90 mm, and a height of 785 mm.

(成形体密度評価)
円筒状のセラミック成形体の、下端部(底部に接していた側の端部)、下端部から中心軸方向に20mm離れた位置、下端部から中心軸方向に40mm離れた位置、下端部から中心軸方向に180mm離れた位置、及び下端部から中心軸方向に390mm離れた位置の密度(g/cm)を測定する。各測定位置においては、円筒状のセラミック成形体の中心軸方向に直交する断面における、内表面から10mmの位置(内表面部)、内表面から40〜50mmの位置(中間部)、及び内表面から65〜75mmの位置(外表面部)の3箇所について測定する。円筒状のセラミック成形体の各箇所の密度測定は、アルキメデス法で行った。
(Molded body density evaluation)
The lower end of the cylindrical ceramic molded body (the end on the side in contact with the bottom), the position 20 mm away from the lower end in the central axis direction, the position 40 mm away from the lower end in the central axis direction, and the center from the lower end The density (g / cm 3 ) at a position 180 mm away in the axial direction and a position 390 mm away from the lower end portion in the central axis direction is measured. At each measurement position, a position 10 mm from the inner surface (inner surface part), a position 40 to 50 mm from the inner surface (intermediate part), and an inner surface in a cross section perpendicular to the central axis direction of the cylindrical ceramic molded body From 3 to 65 mm to 75 mm (outer surface portion). The density measurement at each location of the cylindrical ceramic molded body was performed by the Archimedes method.

(切削加工評価)
円筒状のセラミック成形体をNC旋盤にて切削加工して、図3に示す碍管を作製し、切削加工に要した時間を計測した。作製する碍管の形状としては、図3において、径が細くなっている中央部22の外径を190mm、中心軸方向長さを173mmとし、鍔部23の厚さを20mmとし、鍔部23の数を8枚とし、隣り合う鍔部23、23間の距離を40mmとする。尚、鍔部23の外径は、円筒状のセラミック成形体の両端部を除いた部分の外径と同じとする。
(Cutting evaluation)
A cylindrical ceramic molded body was cut by an NC lathe to produce a soot tube shown in FIG. 3, and the time required for the cutting was measured. As the shape of the soot tube to be manufactured, in FIG. 3, the outer diameter of the central portion 22 whose diameter is small is 190 mm, the length in the central axis direction is 173 mm, the thickness of the collar portion 23 is 20 mm, The number is 8, and the distance between the adjacent flanges 23 and 23 is 40 mm. The outer diameter of the flange 23 is the same as the outer diameter of the portion excluding both ends of the cylindrical ceramic molded body.

Figure 2010076294
Figure 2010076294

Figure 2010076294
Figure 2010076294

(比較例1)
底部側ゴムリング及び蓋部側ゴムリングを用いなかった以外は、実施例1と同様にして静水圧加圧成形型を作製した。実施例1の場合と同様に、円筒状のセラミック成形体を作製し、成形体密度評価及び切削加工評価を行った。成形体密度評価の結果を表1に示し、切削加工評価の結果を表2に示す。
(Comparative Example 1)
A hydrostatic pressure mold was produced in the same manner as in Example 1 except that the bottom rubber ring and the lid rubber ring were not used. As in the case of Example 1, a cylindrical ceramic molded body was produced, and the density evaluation of the molded body and the evaluation of cutting work were performed. The results of the compact density evaluation are shown in Table 1, and the results of the cutting evaluation are shown in Table 2.

表1、2より、底部側ゴムリング及び蓋部側ゴムリングを用いた実施例1の静水圧加圧成形型は、加圧成形後の切削加工時に切削すべき範囲を、小さくすることにより切削時間を14%短縮することができ、更に、両端部の密度の低下が抑制された(表1における、下端部からの距離0mm、20mm及び40mmの欄を参照)円筒状セラミック成形体を成形することができることがわかる。   From Tables 1 and 2, the hydrostatic pressure molding die of Example 1 using the bottom side rubber ring and the lid side rubber ring was cut by reducing the range to be cut at the time of cutting after pressure molding. The time can be shortened by 14%, and the decrease in density at both ends is suppressed (see the columns of 0 mm, 20 mm, and 40 mm from the lower end in Table 1) to form a cylindrical ceramic molded body. You can see that

複数の鍔部を有し、両端部の密度の低下が抑えられた碍管を、短時間で成形するために利用することができる。   A soot tube having a plurality of soot portions and a decrease in density at both end portions can be used for molding in a short time.

本発明の静水圧加圧成形型の一実施形態の、中心軸を含む平面で切断した断面を示す模式図である。It is a schematic diagram which shows the cross section cut | disconnected by the plane containing the central axis of one Embodiment of the isostatic pressing mold of this invention. 本発明の静水圧加圧成形型の一実施形態により成形された円筒状のセラミック成形体の、中心軸を含む平面で切断した断面を示す模式図である。It is a schematic diagram which shows the cross section cut | disconnected by the plane containing a center axis | shaft of the cylindrical ceramic molded object shape | molded by one Embodiment of the isostatic pressing mold of this invention. 碍管の中心軸を含む平面で切断した断面を示す模式図である。It is a schematic diagram which shows the cross section cut | disconnected by the plane containing the central axis of a soot pipe.

符号の説明Explanation of symbols

1:芯金、1a:一方の端部、1b:他方の端部、2:蓋部、2a:蓋部の内表面、3:底部、3a:底部の内表面、4:成形用ゴム型、4a:成形用ゴム型の内表面、5:孔付外筒部、6:貫通孔、7:底部側ゴムリング、8:蓋部側ゴムリング、9:圧力容器、11:円筒状のセラミック成形体、12:端部、13:他の部分、21:碍管、22:中央部、23:鍔部、100:静水圧加圧成形型、V1:成形用空間。 1: cored bar, 1a: one end, 1b: other end, 2: lid, 2a: inner surface of lid, 3: bottom, 3a: inner surface of bottom, 4: rubber mold for molding, 4a: inner surface of molding rubber mold, 5: outer cylinder with hole, 6: through-hole, 7: rubber ring on the bottom side, 8: rubber ring on the lid side, 9: pressure vessel, 11: cylindrical ceramic molding Body: 12: end part, 13: other part, 21: soot tube, 22: center part, 23: collar part, 100: hydrostatic pressure molding die, V1: space for molding.

Claims (3)

円柱状の芯金と、前記芯金の一方の端部に着脱可能に配設された蓋部と、前記芯金の他方の端部に配設された底部と、前記芯金との間に空間を形成するように前記蓋部から前記底部に亘って配設された円筒状の成形用ゴム型とを備え、
前記蓋部の前記芯金側を向く面と、前記底部の前記芯金側を向く面とが、いずれも前記芯金に直交する平面であり、
前記底部及び成形用ゴム型の内表面に接し、前記芯金との間に空間を形成しながら前記芯金を内部に通すように配置された円筒形状の底部側ゴムリングと、前記蓋部及び成形用ゴム型の内表面に接し、前記芯金との間に空間を形成しながら前記芯金を内部に通すように配置された円筒形状の蓋部側ゴムリングとを更に備えた静水圧加圧成形型。
Between the cylindrical cored bar, a lid part detachably disposed at one end of the cored bar, a bottom disposed at the other end of the cored bar, and the cored bar A cylindrical molding rubber mold disposed from the lid to the bottom so as to form a space;
Both the surface facing the cored bar side of the lid part and the surface facing the cored bar side of the bottom part are planes orthogonal to the cored bar,
A cylindrical bottom rubber ring disposed in contact with the bottom and the inner surface of the molding rubber mold and passing through the core metal while forming a space between the core metal, the lid, and Hydrostatic pressurization further comprising a cylindrical lid-side rubber ring that is in contact with the inner surface of the molding rubber mold and is arranged so as to pass the cored bar through the cored bar while forming a space therebetween. Pressure mold.
前記底部側ゴムリングの中心軸方向の長さが、前記芯金の長さの5〜30%であり、前記蓋部側ゴムリングの中心軸方向の長さが、前記芯金の長さの5〜30%である請求項1に記載の静水圧加圧成形型。   The length in the central axis direction of the bottom rubber ring is 5 to 30% of the length of the core metal, and the length in the central axis direction of the lid rubber ring is the length of the core metal. The hydrostatic pressure molding die according to claim 1, which is 5 to 30%. 前記底部側ゴムリングの内周の直径が、前記成形用ゴム型の内周の直径の50〜95%であり、前記蓋部側ゴムリングの内周の直径が、前記成形用ゴム型の内周の直径の50〜95%である請求項1又は2に記載の静水圧加圧成形型。   The inner diameter of the bottom rubber ring is 50 to 95% of the inner diameter of the molding rubber mold, and the inner diameter of the lid rubber ring is the inner diameter of the molding rubber mold. The isostatic pressing mold according to claim 1 or 2, which is 50 to 95% of a circumference diameter.
JP2008247996A 2008-09-26 2008-09-26 Isostatic pressing die Withdrawn JP2010076294A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102490256A (en) * 2011-12-02 2012-06-13 赵德臻 Circumferential isostatic pressing device for ceramic tube
CN103895255A (en) * 2014-04-28 2014-07-02 中国工程物理研究院化工材料研究所 Forming mould and forming method for isostatic pressing annular parts

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102490256A (en) * 2011-12-02 2012-06-13 赵德臻 Circumferential isostatic pressing device for ceramic tube
CN102490256B (en) * 2011-12-02 2013-09-25 赵德臻 Circumferential isostatic pressing device for ceramic tube
CN103895255A (en) * 2014-04-28 2014-07-02 中国工程物理研究院化工材料研究所 Forming mould and forming method for isostatic pressing annular parts

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