JP2765015B2 - Compacting equipment for sintering compact - Google Patents
Compacting equipment for sintering compactInfo
- Publication number
- JP2765015B2 JP2765015B2 JP1060287A JP6028789A JP2765015B2 JP 2765015 B2 JP2765015 B2 JP 2765015B2 JP 1060287 A JP1060287 A JP 1060287A JP 6028789 A JP6028789 A JP 6028789A JP 2765015 B2 JP2765015 B2 JP 2765015B2
- Authority
- JP
- Japan
- Prior art keywords
- lubricant
- mold
- raw material
- material powder
- nozzle
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/0005—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses
- B30B15/0011—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses lubricating means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、焼結用圧粉体の成形装置に関する。Description: TECHNICAL FIELD The present invention relates to an apparatus for forming a green compact for sintering.
（従来の技術） 従来、焼結体を得る場合、原料粉と潤滑剤を混合し、
この混合粉をダイス内に充填し、下パンチと上パンチと
で加圧して所定形状の圧粉体を予加熱して潤滑剤を燃や
し、潤滑剤を圧粉体から除去（いわゆる脱ロウ）し、こ
の後圧粉体を加熱して焼結体を得るようにしていた（特
開昭61−19702号公報参照）。(Prior art) Conventionally, when obtaining a sintered body, a raw material powder and a lubricant are mixed,
The mixed powder is filled in a die, pressurized by a lower punch and an upper punch, and a green compact having a predetermined shape is preheated to burn a lubricant, and the lubricant is removed from the green compact (so-called dewaxing). Thereafter, the compact was heated to obtain a sintered body (see Japanese Patent Application Laid-Open No. 61-19702).
（発明が解決しようとする課題） しかしながら上述した従来の焼結体の製造方法では、
以下のような問題点があった。(Problems to be Solved by the Invention) However, in the conventional method for manufacturing a sintered body described above,
There were the following problems.
原料粉と潤滑剤とは均一になるように混合する必要
があるが、このため多くの時間を要するうえに、均一混
合するのは難しく、この分さらに長い時間を要すること
になる。The raw material powder and the lubricant need to be mixed so as to be uniform. However, this requires a lot of time, and it is difficult to mix uniformly, so that a longer time is required.
圧粉体から潤滑剤を取り除く結果、得られる焼結体
は多孔質となってしまう。As a result of removing the lubricant from the green compact, the resulting sintered body becomes porous.
脱ロウを行なっても潤滑剤が残存してしまう場合が
あり、このような場合、例えばステンレス鋼や軟磁性材
料を原料粉として用いているとき、得られる焼結体の特
性は劣化したものとなる。Even if dewaxing is performed, the lubricant may remain.In such a case, for example, when using stainless steel or a soft magnetic material as a raw material powder, the characteristics of the obtained sintered body are considered to be deteriorated. Become.
なお、金型に直接潤滑剤を塗布する方法も考えられて
いるが工業的レベルで使用できるものではなかった。Although a method of directly applying a lubricant to a mold has been considered, it cannot be used on an industrial level.
本発明は上記問題点の解決を課題としてなされたもの
で、原料粉と潤滑剤との混合工程を不要とし、もって焼
結体の高能率製造と品質向上とに大きく寄与する焼結用
圧粉体の成形装置を提供することを目的とする。The present invention has been made to solve the above problems, and eliminates the need for a step of mixing a raw material powder and a lubricant, thereby greatly contributing to high efficiency production and quality improvement of a sintered body. It is an object of the present invention to provide a body molding device.
（課題を解決するための手段） 本発明は上記目的を達成するために、成形型に直流電
圧を印加するとともに、潤滑剤をこの直流電圧と異なる
極性に帯電させ、該潤滑剤を搬送ノズルから前記成形型
内に吹込んで該成形型の内壁に付着させた状態で、原料
粉を該成形型内に充填して加圧成形する焼結用圧粉体の
成形装置において、前記搬送ノズルの周りをこれと同心
に配した排出ノズルにより囲んで、両者の間の空隙を潤
滑剤の排出流路として構成し、さらに、前記排出ノズル
に、潤滑剤の吹込みに際してその先端と成形型との間を
閉鎖するカバーを取付けたことを特徴とする。(Means for Solving the Problems) In order to achieve the above object, the present invention applies a DC voltage to a mold, charges a lubricant to a polarity different from the DC voltage, and transfers the lubricant from a transfer nozzle. In a molding apparatus for a green compact for sintering in which raw material powder is filled into the molding die and pressure-molded while being blown into the molding die and adhered to the inner wall of the molding die, around the transfer nozzle Is surrounded by a discharge nozzle arranged concentrically therewith, a gap between the two is configured as a discharge passage for lubricant, and further, when the lubricant is blown into the discharge nozzle, a gap between the tip and the molding die is formed. The cover is closed.
（作 用） 本発明は上記構成によって成形型の内壁全面に潤滑剤
を一様に付着させて所望の成形性を確保できるようにな
り、この結果、原料粉と潤滑剤とを混合する工程を省略
することが可能になって、焼結体を高能率に製造できる
ようになる。さらに、原料粉に潤滑剤が混入しなくな
り、この結果得られた焼結体は多孔質とならずち密とな
るとともに潤滑剤が残存するようなことがなくなって優
れた特性のものになる。(Operation) The present invention makes it possible to secure a desired moldability by uniformly applying a lubricant to the entire inner wall of a molding die by the above configuration. As a result, the step of mixing the raw material powder and the lubricant can be performed. This can be omitted, and the sintered body can be manufactured with high efficiency. Further, the lubricant is not mixed into the raw material powder, and the resulting sintered body is not porous, but is dense, and has no residual lubricant, and has excellent characteristics.
（実施例） 以下に、本発明の一実施例としての焼結用圧粉体の成
形装置について図を参照して説明する。(Example) Hereinafter, an apparatus for molding a green compact for sintering as an example of the present invention will be described with reference to the drawings.
第1,2図において、１はこの焼結体の製造方法が用い
られる成形型を示す。この成形型１は、半径がR1の貫通
孔２を形成したダイス３と、貫通孔２に挿入されて上下
動する円柱状の下パンチ４と、を備えている。下パンチ
４の上面部５がダイス３の上面部６から所定距離（例え
ば距離ｌ）下がった状態で、貫通孔２の内周面７および
上面部５が型１の内壁（以下、壁という）８となって室
９を形成している。In FIGS. 1 and 2, reference numeral 1 denotes a forming die in which the method for manufacturing a sintered body is used. The mold 1 has a radius comprises a die 3 having a through hole 2 of R 1, a cylindrical lower punch 4 moves up and down is inserted into the through hole 2, a. In a state where the upper surface 5 of the lower punch 4 is lower than the upper surface 6 of the die 3 by a predetermined distance (for example, a distance 1), the inner peripheral surface 7 and the upper surface 5 of the through hole 2 are connected to the inner wall of the mold 1 (hereinafter, referred to as a wall). 8 to form a chamber 9.
成形型１の上部には、同軸二重円管10と、この同軸二
重円管10の先端部に取付けた絶縁材料製のカバー11と、
を成形型１に対して着脱自在に設けてある。On the upper part of the mold 1, a coaxial double circular pipe 10, a cover 11 made of an insulating material attached to the tip of the coaxial double circular pipe 10,
Is provided detachably with respect to the molding die 1.
同軸二重円管10は、半径がR3の排出ノズル12と、排出
ノズル12内に空隙部10aを空けて挿入された半径がR2の
搬送ノズル13と、を有している。搬送ノズル13の先端部
13aは次式のように設定された距離l1だけダイス３の上
面部６から下がった部位に位置させてある。Coaxial double circular tube 10, a radius of the discharge nozzle 12 of R 3, is inserted at a gap portion 10a to the discharge nozzle 12 in the radius has a transport nozzle 13 for R 2, a. Tip of transfer nozzle 13
13a is are is positioned at a site down from the upper surface portion 6 of the distance l 1 only die 3 set as follows.
０≦l1≦1/2・l2 ……（１） この先端部13aには電極として用いられる数本のピン
（図示せず）を有した帯電フィルタ14を内装してある。
搬送ノズル13の上部にはファンなどの送風装置（図示せ
ず）が連結されており、搬送ノズル13の先端部13aに向
けて送風し得るようになっている。なお、上述した排
出、搬送ノズル12,13の半径R3,R2およびダイス３の貫通
孔２の半径R1は次の（２），（３）式のような関係とな
るように構成してあり、このように構成することによ
り、搬送ノズル13の内部の流速にくらべ空隙部10aの流
速を遅くして潤滑剤Ａを壁８に付着し易いようにしてあ
る。0 ≦ l 1 ≦ 1/2 · l 2 (1) A charging filter 14 having several pins (not shown) used as electrodes is provided inside the tip 13a.
A blower (not shown) such as a fan is connected to the upper portion of the transport nozzle 13 so that air can be blown toward the tip 13a of the transport nozzle 13. The above-mentioned radii R 3 and R 2 of the discharge and transfer nozzles 12 and 13 and the radius R 1 of the through hole 2 of the die 3 are configured so as to satisfy the following equations (2) and (3). With this configuration, the flow rate of the gap 10 a is made slower than the flow rate inside the transfer nozzle 13 so that the lubricant A can be easily attached to the wall 8.
また、カバー11はほぼ円筒状を成し、その半径は貫通
孔２の半径R1より大きくしてあり、貫通孔２の開口部を
囲めるようになっている。 The cover 11 has a substantially cylindrical shape, and its radius is larger than the radius R 1 of the through hole 2 so as to surround the opening of the through hole 2.
ダイス３、下パンチ４および帯電フィルタ14はケーブ
ル15を介して直流電源16に接続している。ダイス３およ
び下パンチ４は直流電源16の陽極17に、また、帯電フィ
ルタ14はその陰極18に接続している。The die 3, the lower punch 4, and the charging filter 14 are connected to a DC power supply 16 via a cable 15. The die 3 and the lower punch 4 are connected to an anode 17 of a DC power supply 16, and the charging filter 14 is connected to its cathode 18.
以上のように構成された成形装置の動作について説明
する。The operation of the molding apparatus configured as described above will be described.
まず、潤滑剤Ａを搬送ノズル13に送り込むと、潤滑剤
Ａは送風装置によって搬送されて帯電フィルタ14に達す
る。そして、帯電フィルタ14によって負に帯電されて室
９に入り込む。すると、この潤滑剤Ａは正に帯電された
壁８に付着するとともに、付着しなかった潤滑剤Ａは空
隙部10aから外部に排出される。この場合、搬送ノズル1
3の先端部13aの位置を式（１）で決められる範囲に設定
してあるので電気力線が室９内に均等にいきわたる。こ
の結果、潤滑剤Ａは壁８の全面にわたってに均一厚さに
付着する。First, when the lubricant A is sent to the transport nozzle 13, the lubricant A is transported by the blower and reaches the charging filter 14. Then, it is negatively charged by the charging filter 14 and enters the chamber 9. Then, the lubricant A adheres to the positively charged wall 8, and the lubricant A that has not adhered is discharged to the outside through the gap 10a. In this case, transport nozzle 1
Since the position of the distal end portion 13a of 3 is set in the range determined by the equation (1), the electric lines of force spread evenly in the chamber 9. As a result, the lubricant A adheres to the entire surface of the wall 8 with a uniform thickness.
この後、同軸二重同管10はカバー11とともに移動され
る。そして、壁８に潤滑剤Ａが付着している状態で、室
９に原料粉を単独で充填する。さらに下パンチ４に対向
して上パンチ（図示せず）を設け、これら上、下パンチ
を用いて原料粉に圧力を加えて圧粉体を得る。この圧粉
体を加熱して焼結体を製造する。Thereafter, the coaxial double pipe 10 is moved together with the cover 11. Then, with the lubricant A attached to the wall 8, the chamber 9 is filled with the raw material powder alone. Further, an upper punch (not shown) is provided opposite to the lower punch 4, and pressure is applied to the raw material powder using the upper and lower punches to obtain a green compact. The green compact is heated to produce a sintered body.
この結果、原料粉と潤滑剤Ａの混粉工程を省略できて
焼結体の製造時間が短縮化されることになる。また、原
料粉の内部に潤滑剤Ａが混入していないので、得られる
焼結体は多孔質にならずち密な製品となる。さらに潤滑
剤Ａが残存することがないので得られる焼結体の特性は
優れたものとなる。As a result, the step of mixing the raw material powder and the lubricant A can be omitted, and the production time of the sintered body is shortened. Further, since the lubricant A is not mixed in the raw material powder, the obtained sintered body is not porous but a dense product. Further, since the lubricant A does not remain, the characteristics of the obtained sintered body are excellent.
なお、本実施例では搬送ノズル13の先端部13aをダイ
ス３の上面部６より下方位置とし、かつ帯電フィルタ14
を搬送ノズル13の先端部13aに設けた場合を例にした
が、これに限定されるものではなく、例えば第３図に示
すように先端部13aを上面部６より上方位置とし、かつ
帯電フィルタ14を搬送ノズル13の上部位置に設けるよう
にしてもよい。このように構成することにより、帯電し
た潤滑剤Ａの量を増加でき、かつ室９における潤滑剤Ａ
の存在量が多くなり、この分潤滑剤Ａが壁８に付着し易
くなる。In this embodiment, the tip 13a of the transport nozzle 13 is positioned below the upper surface 6 of the die 3 and the charging filter 14
Is provided at the tip 13a of the transport nozzle 13, but the present invention is not limited to this. For example, as shown in FIG. 3, the tip 13a is located above the upper surface 6 and the charging filter is provided. 14 may be provided at an upper position of the transport nozzle 13. With this configuration, the amount of the charged lubricant A can be increased, and the lubricant A in the chamber 9 can be increased.
Is increased, and the lubricant A easily adheres to the wall 8 by this amount.
（発明の効果） 以上説明したように、本発明は成形型の内壁全面に潤
滑剤を一様に付着させて所望の成形性を確保できるの
で、原料粉と潤滑剤とを混合する工程を省略することが
可能になって、焼結体を高能率に製造でき、かつ原料粉
の内部に潤滑剤を混入しないので、得られる焼結体は多
孔質とならないうえに潤滑剤が残存することがなくなっ
てち密で特性の優れた製品を得られるという効果を有す
る。(Effects of the Invention) As described above, the present invention can ensure the desired formability by uniformly applying the lubricant to the entire inner wall of the mold, so that the step of mixing the raw material powder and the lubricant is omitted. It is possible to manufacture a sintered body with high efficiency, and since the lubricant is not mixed into the raw material powder, the obtained sintered body is not porous and the lubricant remains. It has the effect that a dense and excellent product can be obtained.
第１図は本発明の一実施例としての焼結用圧粉体の成形
装置を模式的に示した図、 第２図は同成形装置による潤滑剤の吹込み状態を模式的
に示した図、 第３図は第２図と異なる位置に搬送ノズルおよび帯電フ
ィルタを設定したときの潤滑剤搬送状態を示す図であ
る。 １……成形型 ３……ダイス ４……下パンチ ８……壁 ９……室 16……直流電源 17……陽極 18……陰極FIG. 1 is a diagram schematically showing an apparatus for molding a green compact for sintering as one embodiment of the present invention, and FIG. 2 is a view schematically showing a state of lubricant injection by the molding apparatus. FIG. 3 is a view showing a lubricant transport state when a transport nozzle and a charging filter are set at positions different from those in FIG. 1 ... mold 3 ... die 4 ... lower punch 8 ... wall 9 ... chamber 16 ... DC power supply 17 ... anode 18 ... cathode
Claims (1)
滑剤をこの直流電圧と異なる極性に帯電させ、該潤滑剤
を搬送ノズルから前記成形型の内に吹込んで該成形型の
内壁に付着させた状態で、原料粉を該成形型内に充填し
て加圧成形する焼結用圧粉体の成形装置において、前記
搬送ノズルの周りをこれと同心に配した排出ノズルによ
り囲んで、両者の間の空隙を潤滑剤の排出流路として構
成し、さらに、前記排出ノズルに、潤滑剤の吹込みに際
してその先端と成形型との間を閉鎖するカバーを取付け
たことを特徴とする焼結用圧粉体の成形装置。1. A DC voltage is applied to a mold, and a lubricant is charged to a polarity different from the DC voltage, and the lubricant is blown into the mold from a transport nozzle and adheres to an inner wall of the mold. In this state, in a molding apparatus for a green compact for sintering in which the raw material powder is filled into the molding die and press-molded, the raw material powder is surrounded by a discharge nozzle arranged concentrically around the conveying nozzle. Wherein a gap is formed as a discharge passage for the lubricant, and a cover for closing the tip and the mold when the lubricant is blown is attached to the discharge nozzle. Molding equipment for green compacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1060287A JP2765015B2 (en) | 1989-03-13 | 1989-03-13 | Compacting equipment for sintering compact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1060287A JP2765015B2 (en) | 1989-03-13 | 1989-03-13 | Compacting equipment for sintering compact |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02240202A JPH02240202A (en) | 1990-09-25 |
| JP2765015B2 true JP2765015B2 (en) | 1998-06-11 |
Family
ID=13137790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1060287A Expired - Fee Related JP2765015B2 (en) | 1989-03-13 | 1989-03-13 | Compacting equipment for sintering compact |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2765015B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0698435B1 (en) * | 1994-08-24 | 2000-04-19 | Quebec Metal Powders Ltd. | Powder metallurgy apparatus and process using electrostatic die wall lubrication |
| JP4228547B2 (en) * | 2000-03-28 | 2009-02-25 | Ｊｆｅスチール株式会社 | Lubricant for mold lubrication and method for producing high-density iron-based powder compact |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT999894B (en) * | 1973-12-05 | 1976-03-10 | Olivetti & Co Spa | DEVICE FOR THE LUBRICATION OF DIES FOR COMPACTION OF POWDER MATERIALS FOR SINTERED PIECES |
-
1989
- 1989-03-13 JP JP1060287A patent/JP2765015B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02240202A (en) | 1990-09-25 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |