JPH0770601A - Spheroidized metal powder and its production - Google Patents
Spheroidized metal powder and its productionInfo
- Publication number
- JPH0770601A JPH0770601A JP5221043A JP22104393A JPH0770601A JP H0770601 A JPH0770601 A JP H0770601A JP 5221043 A JP5221043 A JP 5221043A JP 22104393 A JP22104393 A JP 22104393A JP H0770601 A JPH0770601 A JP H0770601A
- Authority
- JP
- Japan
- Prior art keywords
- metal particles
- spheroidized
- metal powder
- injection molding
- metal
- 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.)
- Withdrawn
Links
- 239000000843 powder Substances 0.000 title claims abstract description 27
- 239000002184 metal Substances 0.000 title claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000002923 metal particle Substances 0.000 claims abstract description 25
- 238000010298 pulverizing process Methods 0.000 claims description 6
- 238000001746 injection moulding Methods 0.000 abstract description 11
- 239000011230 binding agent Substances 0.000 abstract description 3
- 230000002950 deficient Effects 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 238000009689 gas atomisation Methods 0.000 description 5
- 238000012856 packing Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000009692 water atomization Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000004413 injection moulding compound Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、金属射出成形用に適し
た球状化した金属粉末を提供するものである。FIELD OF THE INVENTION The present invention provides spheroidized metal powders suitable for metal injection molding.
【０００２】[0002]
【従来の技術】金属粉末の製造法としては、液相、固
相、気相の原料から得る方法があるが、液相原料から製
造する方法としては、ガスアトマイズ法、水アトマイズ
法が一般的である。金属粉末を金属射出成形用に用いる
場合には、高充填密度と高流動性を得るために金属粉末
が球形もしくはそれに近い形状であることが望ましい。
そして、ガスアトマイズ法でつくられた金属粉末が球形
に近いものが得られるので最も適している。ガスアトマ
イズ法以外の製造方法によっては球状の粉末を得ること
がむずかしい。図３はガスアトマイズ法で得た粉末の模
式図で、図４は水アトマイズ法で得た粉末の模式図であ
る。図３の場合は球状もしくはそれに近似した形状をし
ているが、図４の場合は多少不定形の非球形を呈してい
る。本出願人はこれを射出成形用に利用すべく、さき
に、特願平３−３２１９００号（特開平５−１５６３２
１号）を提案した。2. Description of the Related Art As a method for producing a metal powder, there is a method of obtaining it from a liquid phase, a solid phase, or a gas phase raw material. As a method of producing from a liquid phase raw material, a gas atomizing method and a water atomizing method are generally used. is there. When the metal powder is used for metal injection molding, it is desirable that the metal powder has a spherical shape or a shape close thereto in order to obtain high packing density and high fluidity.
Further, the metal powder produced by the gas atomizing method is most suitable because it is possible to obtain a spherical powder. It is difficult to obtain a spherical powder by a manufacturing method other than the gas atomizing method. FIG. 3 is a schematic diagram of the powder obtained by the gas atomizing method, and FIG. 4 is a schematic diagram of the powder obtained by the water atomizing method. In the case of FIG. 3, it has a spherical shape or a shape similar thereto, but in the case of FIG. 4, it has a somewhat irregular aspherical shape. In order to utilize this for injection molding, the applicant of the present invention has previously disclosed Japanese Patent Application No. 3-321900 (Japanese Patent Laid-Open No. 15632/1993).
No. 1) was proposed.
【０００３】製造工程中で機械的粉砕により粉末化した
金属粉末は、図２に示すように平面で囲まれた鋭角な多
面体形状となる。この形状のため完成した金属粉末も充
填密度が低く成形性が悪い。特に金属射出成形原料とし
て用いる場合には、射出成形性を確保するため多量のバ
インダーを必要とし、その結果、脱バインダー時間の増
加、脱バインダー時のふくれ、歪等の不具合が発生す
る。The metal powder pulverized by mechanical pulverization in the manufacturing process has an acute polyhedron shape surrounded by a plane as shown in FIG. Due to this shape, the completed metal powder also has a low packing density and poor formability. Especially when used as a metal injection molding raw material, a large amount of binder is required to secure injection moldability, and as a result, problems such as an increase in debinding time, swelling during debinding, and distortion occur.
【０００４】[0004]
【発明が解決しようとする課題】そこで、本発明では機
械的粉砕により得られた平面で囲まれた鋭角な多面体形
状の非球形の金属粒子を球形もしくは球形に近い形状と
して射出成形に適した粉末として提供せんとするもので
ある。Accordingly, in the present invention, a powder which is suitable for injection molding is formed by mechanically crushing non-spherical metal particles having an acute polyhedron shape surrounded by a plane into a spherical shape or a shape close to a spherical shape. It is intended to be provided as.
【０００５】[0005]
【課題を解決するための手段】本発明は、機械的粉砕に
より製造された非球形状金属粒子を球状化したことを特
徴とする球状化金属粉末であり、又、その製造法として
機械的粉砕により製造された非球形状金属粒子を高速気
流中に入れ、該金属粒子同士および／又は該金属粒子と
高速気流中に配設された衝突体とを高速衝突させること
により非球形金属粒子を球状化することを特徴とするも
のである。本発明における非球形状金属粒子としては、
Ｆｅ合金、鋳鉄、Ｓｎ合金が例示される。その中、Ｔｉ
の場合の一例を示すと、水素化脱水素Ｔｉ金属粒子があ
り、これは粒子製造工程中で水素化Ｔｉを機械的に粉砕
して粒子化した後、脱水素して金属粒子とするが、完成
粒子は鋭角な多面体形状を呈する。その模式図が前述の
図２に示す。これを大気中もしくはＡｒ、窒素などの不
活性ガスの高速気流中で非球形金属粒子同士もしくは該
金属粒子と高速気流中に配設された衝突体とを高速衝突
させることにより球状化する。雰囲気ガスの種類および
その流速は対象とする金属粒子の種類によって適宜選択
する。図１に球状化した製品を示す。この球状化した粉
末は、射出成形用金属粉末として好適なものである。The present invention is a spheroidized metal powder characterized in that non-spherical metal particles produced by mechanical pulverization are spheroidized, and as a method for producing the same, mechanical pulverization is performed. The non-spherical metal particles produced by the method described above are put into a high-speed air stream, and the non-spherical metal particles are spherically formed by high-speed collision between the metal particles and / or the metal particles and a colliding body arranged in the high-speed air stream. It is characterized by As the non-spherical metal particles in the present invention,
Examples include Fe alloys, cast iron, and Sn alloys. Among them, Ti
As an example of the case of, there are hydrodehydrogenated Ti metal particles, which are mechanically crushed into particles by hydrolyzing Ti in the particle manufacturing process, and then dehydrogenated into metal particles. The finished particles have a sharp polygonal shape. The schematic diagram is shown in FIG. This is spheroidized by colliding non-spherical metal particles with each other at high speed in the atmosphere or in a high-speed stream of an inert gas such as Ar or nitrogen and the metal particles and a colliding body arranged in the high-speed stream. The type of atmosphere gas and the flow velocity thereof are appropriately selected depending on the type of target metal particles. Fig. 1 shows a spherical product. This spheroidized powder is suitable as a metal powder for injection molding.
【０００６】[0006]
【実施例】非球形状の水素化脱水素Ｔｉ粉末１０ｋｇを
ジェットミルで６０分間処理した。処理した粉末は球形
状で、平均粒径は２４μｍであった。処理前と処理後の
真密度と充填密度を表１に示す。Example 10 kg of non-spherical hydrodehydrogenated Ti powder was treated with a jet mill for 60 minutes. The treated powder was spherical and had an average particle size of 24 μm. Table 1 shows the true density and the packing density before and after the treatment.
【０００７】[0007]
【表１】 [Table 1]
【０００８】上記処理後の水素化脱水素Ｔｉ粉を射出成
形に用いた結果を表２に示す。又、比較例として処理前
の粉末を用いた例も併せて示す。Table 2 shows the results of using the hydrodehydrogenated Ti powder after the above treatment in injection molding. Further, as a comparative example, an example using powder before treatment is also shown.
【０００９】[0009]
【表２】 [Table 2]
【００１０】[0010]
【発明の効果】本発明は、射出成形性の悪い非球状金属
粉を球状化して充填密度を上げ、射出成形時の射出成形
性を大幅に改善した。又、これにより射出成形用コンパ
ウンドのバインダー量を下げることを可能とし、脱脂時
間の短縮とともに脱脂時の不良率を著しく低減すること
ができる。INDUSTRIAL APPLICABILITY According to the present invention, the non-spherical metal powder having poor injection moldability is spheroidized to increase the packing density, and the injection moldability during injection molding is greatly improved. Further, this makes it possible to reduce the amount of the binder in the injection molding compound, and it is possible to shorten the degreasing time and significantly reduce the defective rate during degreasing.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明で得られた球状化金属粒子の模式図であ
る。FIG. 1 is a schematic view of spheroidized metal particles obtained in the present invention.
【図２】機械的粉砕により得られた金属粒子の模式図で
ある。FIG. 2 is a schematic diagram of metal particles obtained by mechanical pulverization.
【図３】ガスアトマイズ法により得られた金属粒子の模
式図である。FIG. 3 is a schematic diagram of metal particles obtained by a gas atomizing method.
【図４】水アトマイズ法により得られた金属粒子の模式
図である。FIG. 4 is a schematic diagram of metal particles obtained by a water atomizing method.
Claims (3)
属粒子を球状化したことを特徴とする球状化金属粉末。1. A spheroidized metal powder characterized in that aspherical metal particles produced by mechanical pulverization are spheroidized.
属粒子を高速気流中に入れ、該金属粒子同士および／又
は該金属粒子と高速気流中に配設された衝突体とを高速
衝突させることにより非球形状金属粒子を球状化するこ
とを特徴とする球状化金属粉末の製造方法。2. Non-spherical metal particles produced by mechanical pulverization are put into a high-speed air stream, and the metal particles and / or the metal particles are collided at high speed with a colliding body arranged in the high-speed air stream. A method for producing a spheroidized metal powder, characterized in that the non-spherical metal particles are thereby spheroidized.
流を大気、還元気流、不活性気流の何れかとする請求項
２記載の球状化金属粉末の製造方法。3. The method for producing a spheroidized metal powder according to claim 2, wherein the high-speed airflow is any one of the air, a reducing airflow and an inert airflow depending on the type of the non-spherical metal particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5221043A JPH0770601A (en) | 1993-09-06 | 1993-09-06 | Spheroidized metal powder and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5221043A JPH0770601A (en) | 1993-09-06 | 1993-09-06 | Spheroidized metal powder and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0770601A true JPH0770601A (en) | 1995-03-14 |
Family
ID=16760599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5221043A Withdrawn JPH0770601A (en) | 1993-09-06 | 1993-09-06 | Spheroidized metal powder and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0770601A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013060667A (en) * | 2004-12-06 | 2013-04-04 | Sunrex Kogyo Kk | Metal product |
-
1993
- 1993-09-06 JP JP5221043A patent/JPH0770601A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013060667A (en) * | 2004-12-06 | 2013-04-04 | Sunrex Kogyo Kk | Metal product |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20001107 |