JPS62199701A - Powder molding method - Google Patents
Powder molding methodInfo
- Publication number
- JPS62199701A JPS62199701A JP3927486A JP3927486A JPS62199701A JP S62199701 A JPS62199701 A JP S62199701A JP 3927486 A JP3927486 A JP 3927486A JP 3927486 A JP3927486 A JP 3927486A JP S62199701 A JPS62199701 A JP S62199701A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- elastic
- core
- molding
- mold
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 239000000843 powder Substances 0.000 title claims abstract description 33
- 238000000465 moulding Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 6
- 239000013013 elastic material Substances 0.000 claims abstract description 6
- 229910000640 Fe alloy Inorganic materials 0.000 claims abstract description 4
- 239000000919 ceramic Substances 0.000 claims abstract description 4
- 238000000462 isostatic pressing Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 238000007789 sealing Methods 0.000 abstract description 3
- 238000005452 bending Methods 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、中空状粉末成形体を静水圧加圧成形法で成形
するのに適した弾性型及び弾性中子を使用した粉末加圧
成形法に関する。Detailed Description of the Invention [Industrial Field of Application] The present invention is directed to powder pressure molding using an elastic mold and an elastic core suitable for molding hollow powder compacts by isostatic pressure molding. Regarding the law.
第２図に従来の方法を示す。ＭｌやＭＯ等を含む鉄合金
粉末あるいはジルコニア（ＺｒＯ□）やアルミナ（Ａ１
２０３）等のセラミックス粉末０１を弾性型０２（例え
ばゴム）の中に入れて両端を封じ込める弾性型置の中心
部には鋼製の中子０４がある。弾性型０２の側面と端面
との接合部は図示していないが、ビニールあるいはゴム
などのテープで気密にシールされており１弾性型の中に
圧力媒体（水）が入いらないようにしている。この状態
で弾性型０２を冷間静水圧加圧装置（Ｃ工Ｐ）に入れて
１弾性型の周囲から水圧を与える。弾性型内の粉末は体
積を減じながら固っていく。第２図（ｂ）は一定の水圧
で保持した時の弾性型の状態を示す。FIG. 2 shows a conventional method. Iron alloy powder containing Ml, MO, etc. or zirconia (ZrO□) or alumina (A1
A steel core 04 is located at the center of the elastic mold 02 (for example, rubber) in which a ceramic powder 01 such as 203) is placed in an elastic mold 02 (for example, rubber) to seal both ends. Although the joint between the side surface and the end surface of the elastic mold 02 is not shown, it is hermetically sealed with vinyl or rubber tape to prevent pressure medium (water) from entering the elastic mold 1. In this state, the elastic mold 02 is placed in a cold isostatic pressurizing device (C process P), and water pressure is applied from around the elastic mold 1. The powder inside the elastic mold solidifies while decreasing its volume. FIG. 2(b) shows the state of the elastic mold when held under constant water pressure.
弾性型０２及び粉末０１は水圧により収縮するが、鋼製
中子０４は弾性範囲でしか変形しないため、中子０４近
傍の粉末や弾性型両端面は軸方向への収縮は中子にそっ
てすべりながら行われる。このため（１）弾性型０２端
而と中子０４間のシールが難しく、高水圧になると、水
が型中に入シ易い。The elastic mold 02 and powder 01 contract due to water pressure, but since the steel core 04 deforms only within the elastic range, the powder near the core 04 and both end surfaces of the elastic mold contract in the axial direction along the core. It is performed while sliding. For this reason, (1) it is difficult to seal between the end of the elastic mold 02 and the core 04, and water easily enters the mold when high water pressure is applied.
（２１中子０４は弾性範囲でしか変形しないため、中子
０４近傍の粉末は軸方向に収縮しにくくなり、粉末にせ
ん断応力が発生する。(Since the 21 core 04 deforms only within the elastic range, the powder near the core 04 becomes difficult to contract in the axial direction, and shear stress is generated in the powder.
（３）粉末のつめ方に局部的にムラがあると、中子Ｏ４
が粉の流動をさまたげるため第３図（１））に示すよう
に曲ることかある。(3) If there is local unevenness in the way the powder is packed, the core O4
In order to hinder the flow of the powder, it may bend as shown in Figure 3 (1)).
（４） 曲りを生じると成形後中子０４の取出しがで
きない等の問題点がある。(4) If bending occurs, there are problems such as the fact that the core 04 cannot be taken out after molding.
中子も粉末と同じように成形時に収縮させれば結果的に
中子が無いのと同じ事になり、良好な成形品が得られる
。If the core is also shrunk during molding in the same way as the powder, the result will be the same as if there were no core, and a good molded product would be obtained.
この点に注目し、中子に伸縮可能な弾性材料を用いると
、弾性中子は通常の中子の働きをすると同時に、粉末と
同じように収縮するため、割れや変形などのない第３図
（ａ）に示すような成形品が得られる。Focusing on this point, if you use a stretchable elastic material for the core, the elastic core will function as a normal core and at the same time contract in the same way as powder, so there will be no cracking or deformation as shown in Figure 3. A molded article as shown in (a) is obtained.
弾性型を圧力媒体を介して圧縮する際に、中子も周囲の
粉末と共に圧縮される。When compressing the elastic mold via a pressure medium, the core is also compressed together with the surrounding powder.
従って加圧成形時に、中子と周囲の粉末との間に剪断、
滑シ等を発生せず、粉末の加圧成形が容易且つ正確に行
なわれる。Therefore, during pressure molding, shearing occurs between the core and the surrounding powder.
Pressure molding of powder can be easily and accurately performed without causing slippage or the like.
第１図に弾性中子３を使用した実施例を示す。 FIG. 1 shows an example in which an elastic core 3 is used.
ｌは鉄合金又はセラミックス等の粉末、２は弾性型、３
は伸縮自由な軟質ゴムなどの弾性材料で作られた弾性中
子である。弾性中子３を有する弾性型２の中に粉末１を
入れて密閉する。l is powder of iron alloy or ceramics, 2 is elastic type, 3
is an elastic core made of elastic material such as soft rubber that can expand and contract freely. Powder 1 is placed in an elastic mold 2 having an elastic core 3 and sealed.
この場合弾性中子３は軸方向に引張って固定する。この
引張力を与える長さは最終的に粉末が固まった時にも弾
性中子３には引張力が作用する以上とする。In this case, the elastic core 3 is pulled and fixed in the axial direction. The length for applying this tensile force is set to be longer than the tensile force that acts on the elastic core 3 even when the powder is finally solidified.
この状態で水圧を与えると１弾性型２１弾性中子３及び
粉末が相互にすベシを生じない状態で収縮するので、第
３図（ｂ）のように全体的に曲ることはない。弾性中子
３には引張力が与えられているので、直線を保持しなが
ら収縮するだけであシ５中子としての働きを保つ（第３
図（ａ）参照）。又弾性型２の端面と弾性中子３とは相
互にすべりを生じないため、シールは容易であり、成形
後の弾性中子の取出しも容易である。なぜならば、弾性
中子３は成形特圧縮されて増径しているが、これを一方
から引張ると、減径され、その摺動抵抗が小さくなるた
めである。If water pressure is applied in this state, the elastic mold 1 21 elastic core 3 and the powder will contract without forming a wedge with each other, so the entire structure will not bend as shown in FIG. 3(b). Since a tensile force is applied to the elastic core 3, it simply contracts while maintaining its straight line and maintains its function as a core (5).
(See figure (a)). Further, since there is no mutual slippage between the end face of the elastic mold 2 and the elastic core 3, sealing is easy and the elastic core can be easily removed after molding. This is because although the elastic core 3 has been specially compressed during molding and has an increased diameter, if it is pulled from one side, the diameter will be reduced and its sliding resistance will be reduced.
本発明によれば中子が無いのと同じ状態で成形できるの
で、シール方法が容易であり、又成形品が曲ることもな
い。成形後の中子の取出しも容易となる。According to the present invention, molding can be performed without a core, so the sealing method is easy and the molded product does not bend. It also becomes easier to take out the core after molding.
第１図の（ａ）は本発明による成形前の状態、（ｂ）は
成形中の状態を示す。
第２図の（ａ）は従来方法による成形前の状態、（ｂ）
は成形中の状態を示す。
第３図（ａ） 、 （１：＋１は成形品の状態を示す概
略図である。
１・・・粉末、２・・・弾性型、３・・・弾性中子。
復代理人 弁理士 岡 本 重 文
外２名
第１図FIG. 1(a) shows the state before molding according to the present invention, and FIG. 1(b) shows the state during molding. Figure 2 (a) is the state before molding by the conventional method, (b)
indicates the state during molding. FIG. 3(a), (1:+1 is a schematic diagram showing the state of the molded product. 1... Powder, 2... Elastic mold, 3... Elastic core. Sub-Agent Patent Attorney Oka Honju, 2 people outside the text Figure 1
Claims (1)
より中空状に成形する方法において、中空部を成形する
ための中子に伸縮可能な弾性材料を用い、同中子を伸張
した状態で粉末中に埋設し、周囲を弾性材料で被覆した
後、全表面から加圧成形することを特徴とする粉末成形
方法。In a method of forming powder such as iron alloys or ceramics into a hollow shape by isostatic pressing, a stretchable elastic material is used as the core to form the hollow part, and the powder is formed in a stretched state. A powder molding method characterized by embedding the powder inside a powder, covering the periphery with an elastic material, and then pressure molding the entire surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3927486A JPS62199701A (en) | 1986-02-26 | 1986-02-26 | Powder molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3927486A JPS62199701A (en) | 1986-02-26 | 1986-02-26 | Powder molding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62199701A true JPS62199701A (en) | 1987-09-03 |
Family
ID=12548580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3927486A Pending JPS62199701A (en) | 1986-02-26 | 1986-02-26 | Powder molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62199701A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000016935A1 (en) * | 1998-09-18 | 2000-03-30 | Injex Corporation | Method of forming undercut in metal powder injection-molded article and metal powder injection-molded article having undercut |
-
1986
- 1986-02-26 JP JP3927486A patent/JPS62199701A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000016935A1 (en) * | 1998-09-18 | 2000-03-30 | Injex Corporation | Method of forming undercut in metal powder injection-molded article and metal powder injection-molded article having undercut |
| US6444167B1 (en) | 1998-09-18 | 2002-09-03 | Injex Corporation | Method of forming undercut in metal powder injection-molded article |
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