JPH089120B2 - Hydrostatic press molding method - Google Patents
Hydrostatic press molding methodInfo
- Publication number
- JPH089120B2 JPH089120B2 JP2336497A JP33649790A JPH089120B2 JP H089120 B2 JPH089120 B2 JP H089120B2 JP 2336497 A JP2336497 A JP 2336497A JP 33649790 A JP33649790 A JP 33649790A JP H089120 B2 JPH089120 B2 JP H089120B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molding
- powder
- punch
- molded body
- 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.)
- Expired - Lifetime
Links
- 238000000465 moulding Methods 0.000 title claims description 38
- 238000000034 method Methods 0.000 title claims description 17
- 230000002706 hydrostatic effect Effects 0.000 title claims description 16
- 239000000843 powder Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 15
- 229920001971 elastomer Polymers 0.000 description 8
- 238000009694 cold isostatic pressing Methods 0.000 description 6
- 238000009415 formwork Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 239000004925 Acrylic resin Substances 0.000 description 4
- 229920000178 Acrylic resin Polymers 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】 （イ）技術分野 本発明は、粉体の静水圧プレス成形法に関するもので
ある。TECHNICAL FIELD The present invention relates to a hydrostatic press molding method for powder.
（ロ）従来技術 一般に、粉体の成形法としては、（ａ）金型に粉末を
充填し、金属製のパンチで加圧して成形体を得る方法
や、（ｂ）シリコンゴムやウレタンゴム等の弾性を有す
る容器に粉末を充填し、冷間静水圧により等方向圧縮し
て成形体を得る方法等が提案され、実施されている。(B) Conventional technology In general, as a powder molding method, (a) a method of filling powder in a mold and pressurizing with a metal punch to obtain a molded body, (b) silicon rubber, urethane rubber, etc. A method has been proposed and implemented in which a container having elasticity is filled with powder and isotropically compressed by cold isostatic pressure to obtain a molded body.
しかしながら、（ａ）法では、加圧力に耐えるため
に、型枠とパンチの両方を厚肉の金属で製作しなければ
ならず、また（ｂ）法では、ゴム型枠の場合には、ゴム
自体の変形のために成形体の形状精度が悪く、この対策
として金型とゴム型とを組合せたりしなければならな
い。However, in the method (a), both the mold and the punch must be made of thick metal in order to withstand the pressing force, and in the method (b), in the case of a rubber mold, a rubber mold is used. Due to the deformation of itself, the shape accuracy of the molded body is poor, and as a countermeasure against this, a mold and a rubber mold must be combined.
そのため、上記の方法には更に次のような欠点があ
る。Therefore, the above method has the following drawbacks.
（１）金型の場合には型自体の重量が重く、成形圧力が
高くなるほど、また成形体の寸法が大きくなるほど、そ
の傾向が強くなるため、特に大型成形体を得ようとする
場合には過大な設備が必要になり、そのために設備費や
型枠費用が増大する。(1) In the case of a mold, the tendency becomes stronger as the mold itself is heavier and the molding pressure is higher and the size of the molded product is larger. Excessive equipment is required, which increases equipment costs and formwork costs.
（２）弾性体製のゴム型の場合は、例えば金型を組合せ
た場合でも、得られる成形体の形状精度が悪く、必ず機
械加工が必要となる。また、金型プレス成形等の予備成
形を必要とするゴム型のみの場合には、静水圧により等
方向に収縮するので、加圧容器の寸法に比してかなり小
さく変形した形状精度の悪い成形体しか得られない。(2) In the case of a rubber mold made of an elastic body, for example, even when a mold is combined, the shape accuracy of the obtained molded body is poor, and machining is indispensable. Also, in the case of only a rubber mold that requires pre-molding such as die press molding, since it contracts in the same direction due to hydrostatic pressure, it is deformed considerably smaller than the size of the pressurized container and molding with poor shape accuracy Only the body can be obtained.
（３）しかも、上記の金型成形法では、型から成形体を
取り出すときにパンチを移動させて該型から抜き出す手
法が取られるが、大型成形体になるほど成形体のスプリ
ングバックが大きくて割れ易くなる。(3) Moreover, in the above-mentioned mold forming method, when the molded body is taken out from the mold, a punch is moved to extract from the mold. However, the larger the molded body is, the larger the springback of the molded body is and the cracks occur. It will be easier.
（ハ）発明の開示 そこで、本発明は上記のような諸問題を始め、特に大
型成形体を形成する場合の型の小型化，軽量化，寸法精
度の向上ならびに型抜き時の割れの発生防止に着目し、
これらの課題を解決すべく鋭意研究したところ、静水圧
装置を用いて１軸成形を行なうことにより、型枠にもパ
ンチと同等の圧力が加わり、パンチの加圧力と型枠を押
える力がバランスするので、型枠の厚みを薄くできると
共に、パンチ面にも均一な水圧がかかるために、パンチ
自体にそれ程の強度を必要とすることなく、平行度を保
つ程度の厚みがあれば充分であることを見い出し、本発
明をなすに至ったのである。即ち、 第１の発明は、粉体を静水圧プレス成形するにあた
り、該静水圧に対して剛性の型枠内に該粉体を装入し、
該静水圧に対して剛性の成型パンチを該型枠内に該型枠
内面と摺動自在に挿入し、静水圧で駆動して該粉体をプ
レス成形することを特徴とする静水圧プレス成形法であ
り、 第２の発明は、粉体を静水圧プレス成形するにあた
り、該静水圧に対して剛性の組立式型枠内に該粉体を装
入し、該静水圧に対して剛性の成型パンチを該型枠内に
該型枠内面と摺動自在に挿入し、静水圧で駆動して該粉
体をプレス成形した後、該組立式型枠を分解して粉体の
成形体を得ることを特徴とする静水圧プレス成形法であ
る。(C) Disclosure of the Invention Therefore, the present invention addresses the problems as described above, and particularly, in the case of forming a large-sized molded body, the mold is downsized, the weight is reduced, the dimensional accuracy is improved, and cracks are prevented from occurring during die cutting. Paying attention to
As a result of diligent research to solve these problems, by performing uniaxial molding using a hydrostatic pressure device, a pressure equivalent to that of the punch is applied to the mold, and the punch pressure and the force of pressing the mold are balanced. Therefore, the thickness of the mold can be reduced, and uniform water pressure is also applied to the punch surface. Therefore, it is sufficient if the punch itself has a sufficient thickness to maintain parallelism without requiring such strength. After discovering this, the present invention was completed. That is, in the first invention, when the powder is hydrostatically press-molded, the powder is charged into a mold that is rigid against the hydrostatic pressure,
A hydrostatic press molding, characterized in that a molding punch rigid against the hydrostatic pressure is slidably inserted into the mold inside the mold and driven by hydrostatic pressure to press-form the powder. A second aspect of the present invention is, when the powder is hydrostatically press-molded, the powder is loaded into a prefabricated formwork that is rigid with respect to the hydrostatic pressure, and A molding punch is slidably inserted into the inner surface of the mold and driven by hydrostatic pressure to press-mold the powder, and then the prefabricated mold is disassembled to form a powder compact. It is a hydrostatic press molding method characterized in that it is obtained.
次に、本発明を詳細に説明する。 Next, the present invention will be described in detail.
本発明は上記のように構成された静水圧プレス成形法
であり、本発明方法に使用する型枠は、プレス型にアク
リル樹脂あるいはテフロン樹脂等の材質で製作した剛性
の型枠であり、パンチも型枠と同様の材質で製作した剛
性の成型パンチである。The present invention is a hydrostatic press molding method configured as described above, the mold used in the method of the present invention is a rigid mold made of a material such as acrylic resin or Teflon resin in the press mold, punch Is a rigid punch made of the same material as the mold.
型枠の構造は所望する成形体の形状（平板状，円板状
等）により任意形状に製作すればよいのであるが、本発
明における型枠の構造例を第１図及び第２図（平板状成
形体を成形する型枠）に示したが、冷間静水圧プレス成
形後の成形体の離型性を向上させるために、一体構造の
型枠でも勿論よいが、型枠は組立式型枠とすると更によ
い。基本的には、型枠が容易に分解できて、成形体が容
易に取出せる構造の型枠であればよいのである。第２図
はその一例を示したもので、型枠の構造自体は特に限定
されるものではない。The structure of the mold may be produced in an arbitrary shape according to the desired shape of the molded product (flat plate, disc shape, etc.). Examples of the structure of the mold according to the present invention are shown in FIGS. 1 and 2 (flat plate). Although it is shown in the form for forming a compact shaped body), in order to improve the releasability of the shaped body after cold isostatic pressing, it is of course possible to use a mold of integral structure, but the form is an assembly type mold. It is better to use a frame. Basically, any mold can be used as long as the mold can be easily disassembled and the molded product can be easily taken out. FIG. 2 shows an example thereof, and the structure of the formwork itself is not particularly limited.
本発明における剛性の型枠及び成型パンチは、上記の
ような材質で製作されているために、軽量かつ低コスト
であり、容易に大型化することができる。また、本発明
による型枠や成型パンチを使用して冷間静水圧プレス成
型を行なうことにより、形状精度の高い成形体が容易に
かつ低コストで得られるのである。更に、組立式型枠な
ので型抜き時の割れの発生が完全に防止できるのであ
る。Since the rigid mold frame and molding punch according to the present invention are made of the above-mentioned materials, they are lightweight and low cost, and can be easily increased in size. Further, by performing cold isostatic pressing using the mold and the molding punch according to the present invention, a molded product having high shape accuracy can be easily obtained at low cost. Further, since it is an assembling mold, it is possible to completely prevent the occurrence of cracks at the time of mold removal.
本発明によれば、特に大型の成形体の成形が、従来の
成形法に比べて容易である。According to the present invention, the molding of a particularly large molded body is easier than the conventional molding method.
また、本発明において、型枠のみに鉄等の金属を使用
すれば、重量増によるハンドリング性の低下があるが、
更に形状精度の高い成形体が得られる。Further, in the present invention, if a metal such as iron is used only in the mold, there is a decrease in handleability due to an increase in weight
Further, a molded product having a high shape accuracy can be obtained.
次に、本発明を実施例により説明する。 Next, the present invention will be described with reference to examples.
（ニ）実施例 実施例１ 第２図に示すアクリル樹脂製の組立式型枠（外形寸
法:80w×310l×40t、内形寸法:60w×290l×40t）と成型
パンチ（60w×290l×20t）とからなる型を用い、アルミ
ナ粉の成形を行なった。(D) Example 1 Example 1 Acrylic resin prefabricated formwork shown in Fig. 2 (outer dimensions: 80w x 310l x 40t, internal dimensions: 60w x 290l x 40t) and molding punch (60w x 290l x 20t) A) was used to mold alumina powder.
供試したアルミナ粉は市販のアルミナ顆粒であり、成
形圧は1000Kgf/cm2で冷間静水圧プレス成形を行なっ
た。成形後の離型は組型枠を分解して成形体を取り出し
た。The tested alumina powder was a commercially available alumina granule, and cold isostatic pressing was carried out at a molding pressure of 1000 Kgf / cm 2 . For mold release after molding, the assembled frame was disassembled and the molded product was taken out.
この成形により、60w×290l×5.3tの平板状の成形体
が得られ、厚み分布：±0.10mm,グリーン密度:2.34g/cm
3の形状精度の高いアルミナ製平板状成形体が得られ
た。しかも、型抜き時の成形体の割れ等は全く認められ
なかった。By this molding, a 60w × 290l × 5.3t flat plate shaped body was obtained, thickness distribution: ± 0.10mm, green density: 2.34g / cm
A flat plate-shaped compact made of alumina having a high shape accuracy of 3 was obtained. Moreover, no cracking of the molded product was observed at the time of die cutting.
実施例２ アクリル樹脂製の組立式型枠（外形寸法:190w×500l
×40t、内形寸法:170w×480l×40t）と成型パンチ（170
w×480l×20t）からなる型を用いて、アルミナ粉の成形
を行なった。Example 2 Acrylic resin prefabricated formwork (external dimensions: 190w x 500l
× 40t, internal size: 170w × 480l × 40t) and molding punch (170
Alumina powder was molded using a mold composed of w × 480l × 20t).
供試したアルミナ粉は市販のアルミナ顆粒であり、成
形圧は3000Kgf/cm2で冷間静水圧プレス成形を行なっ
た。The tested alumina powder was a commercially available alumina granule, and cold isostatic pressing was carried out at a molding pressure of 3000 Kgf / cm 2 .
成形後の離型は、組立式型枠を分解して成形体を取り
出した。For mold release after molding, the prefabricated mold was disassembled and the molded body was taken out.
この成形により、170w×480l×6.5tの寸法で、厚み分
布：±0.15mm、グリーン密度:2.45g/cm3の形状精度の高
い大型のアルミナ製平板状成形体が得られた。また、型
抜き時の成形体の割れ等は全く認められなかった。By this molding, a large-sized alumina flat plate-shaped compact having dimensions of 170w × 480l × 6.5t, thickness distribution: ± 0.15 mm, green density: 2.45 g / cm 3 and high shape accuracy was obtained. Moreover, no cracking of the molded body was observed at the time of die cutting.
実施例３ アクリル樹脂製の円筒状の組立式型枠（外径寸法190
φ×40t、内径寸法180φ×40t）とテフロン製の成型パ
ンチ（180φ×20t）とからなる型を用いて、アルミナ粉
の成形を行なった。Example 3 A cylindrical assembling mold made of acrylic resin (outer diameter of 190
Alumina powder was molded using a mold composed of a φ × 40t, an inner diameter of 180φ × 40t) and a Teflon molding punch (180φ × 20t).
供試したアルミナ粉末としては市販のアルミナ顆粒を
供試し、成形圧は3000Kgf/cm2で冷間静水圧プレス成形
を行なった。Commercially available alumina granules were used as the tested alumina powder, and cold isostatic pressing was performed at a molding pressure of 3000 Kgf / cm 2 .
成形後の離型は組立式型枠を分解して成形体を取り出
した。For mold release after molding, the prefabricated mold was disassembled and the molded body was taken out.
この成形により、180φ×7.1tの寸法で、厚み分布：
±0.12mm、グリーン密度:2.45g/cm3の形状精度の高いア
ルミナ製円板状の成形体が得られた。また、型抜き時の
成形体の割れ等は全く認められなかった。By this molding, the size of 180φ x 7.1t, thickness distribution:
A disk-shaped molded body made of alumina with high shape accuracy of ± 0.12 mm and green density: 2.45 g / cm 3 was obtained. Moreover, no cracking of the molded body was observed at the time of die cutting.
比較例 従来のゴム製型枠とアクリル製型パンチとからなる内
径寸法60w×290l×8tの板状成形体用の型を用いて、ア
ルミナ粉の成形を行なった。Comparative Example Alumina powder was molded using a mold for a plate-shaped molded body having an inner diameter of 60w × 290l × 8t, which was composed of a conventional rubber mold and an acrylic mold punch.
アルミナ粉末は市販のアルミナ顆粒を供試し、成形圧
は1000Kgf/cm2で冷間静水圧プレス成形を行なった。As the alumina powder, commercially available alumina granules were tested, and cold isostatic pressing was carried out at a molding pressure of 1000 Kgf / cm 2 .
得られた成形体の平均外形寸法は51.4w×278l×4.8t
で、厚み分布：±0.28mm、グリーン密度:2.21g/cm3であ
った。また、ゴム製型枠の弾性変形のためにエッヂの直
線性が悪く、形状精度，面の厚み分布ともに本発明法に
よる場合に比較してかなり劣っている成形体である。The average external dimension of the obtained molded body is 51.4w × 278l × 4.8t
The thickness distribution was ± 0.28 mm and the green density was 2.21 g / cm 3 . Further, the linearity of the edge is poor due to the elastic deformation of the rubber mold, and the shape accuracy and the surface thickness distribution are considerably inferior to those obtained by the method of the present invention.
（ホ）発明の効果 上記のように、冷間静水圧プレス成形の型枠及び成型
パンチに剛性の樹脂製や金属製の型を用いる本発明法に
よれば、従来のゴム製型枠の場合では得られなかった形
状精度の高い成形体を得ることができる。(E) Effect of the Invention As described above, according to the method of the present invention in which a rigid resin or metal mold is used for the cold isostatic press mold and the molding punch, in the case of the conventional rubber mold, It is possible to obtain a molded product with high shape accuracy, which was not possible with.
さらに、型枠を組立式とすることにより、型抜き時の
成形体の割れを防止することできる。Furthermore, by making the mold frame an assembling type, it is possible to prevent cracking of the molded body when the mold is removed.
また、本発明法により成形体の加工に要する時間が著
しく短縮されると共に、加工歩留りも大幅に改善され、
しかも樹脂製型は容易に大型化することができ、更に低
コストであるために、多品種少量生産にも適応できる
等、多くの利点がある。Further, by the method of the present invention, the time required for processing the molded body is significantly shortened, and the processing yield is significantly improved,
In addition, the resin mold can be easily increased in size and has a low cost, so that it has many advantages such as being adaptable to high-mix low-volume production.
第１図は本発明により平板状の成形体を成形する場合に
使用する剛性の型枠の平面図であり、第２図は成型パン
チと組合された型枠の正面図である。 符号説明 １……型枠、２……成型パンチ、３……貫通孔、４……
材料、５……固定具（ピン）FIG. 1 is a plan view of a rigid mold used for molding a flat molded body according to the present invention, and FIG. 2 is a front view of a mold combined with a molding punch. Reference numeral 1 ... Formwork, 2 ... Molding punch, 3 ... Through hole, 4 ...
Material: 5 Fixture (pin)
フロントページの続き (72)発明者 江島 光一郎 東京都秋川市牛沼27―１ マウンテン秋川 ハイツ302号 (56)参考文献 特開 昭63−86803（ＪＰ，Ａ) 特開 昭62−89600（ＪＰ，Ａ) 特開 昭52−64072（ＪＰ，Ａ)Continuation of the front page (72) Koichiro Ejima 27-1 Ushinuma, Akigawa-shi, Tokyo Mountain Akikawa Heights 302 (56) References JP-A-63-86803 (JP, A) JP-A-62-89600 (JP, A) ) JP-A-52-64072 (JP, A)
Claims (1)
静水圧に対して樹脂体で製作した組立式型枠内に該粉体
を装入し、該静水圧に対して上記型枠と同じ材質で製作
した上下の成型パンチを該型枠内面で摺動自在に挿入し
て静水圧で均一な冷間静水圧プレス成形を施して形状精
度の高い板状成形体を成形した後、該組立式型枠を分解
して粉体の成形体を得ることを特徴とする静水圧プレス
成形法。1. When hydrostatically press-molding powder, the powder is loaded into a prefabricated mold made of a resin for the hydrostatic pressure, and the mold is used for the hydrostatic pressure. After the upper and lower molding punches made of the same material are slidably inserted on the inner surface of the mold, uniform cold isostatic press molding is performed with hydrostatic pressure to form a plate-shaped compact with high shape accuracy, A hydrostatic press molding method characterized in that a prefabricated mold is disassembled to obtain a powder compact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2336497A JPH089120B2 (en) | 1990-11-30 | 1990-11-30 | Hydrostatic press molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2336497A JPH089120B2 (en) | 1990-11-30 | 1990-11-30 | Hydrostatic press molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04200999A JPH04200999A (en) | 1992-07-21 |
| JPH089120B2 true JPH089120B2 (en) | 1996-01-31 |
Family
ID=18299743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2336497A Expired - Lifetime JPH089120B2 (en) | 1990-11-30 | 1990-11-30 | Hydrostatic press molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH089120B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014129231A (en) * | 2005-02-01 | 2014-07-10 | Tosoh Corp | Sintered compact and sputtering target |
| CN109923629A (en) * | 2016-11-09 | 2019-06-21 | Tdk株式会社 | The manufacturing method of rare-earth magnet |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6289600A (en) * | 1985-10-15 | 1987-04-24 | Sumitomo Light Metal Ind Ltd | Forming jig for hollow compressed object by cold isotropic hydrostatic pressure |
| JPS6386803A (en) * | 1986-09-30 | 1988-04-18 | Tokyo Tungsten Co Ltd | Production of tungsten green compact and sintered body |
-
1990
- 1990-11-30 JP JP2336497A patent/JPH089120B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014129231A (en) * | 2005-02-01 | 2014-07-10 | Tosoh Corp | Sintered compact and sputtering target |
| CN109923629A (en) * | 2016-11-09 | 2019-06-21 | Tdk株式会社 | The manufacturing method of rare-earth magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04200999A (en) | 1992-07-21 |
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