JPS58224097A - Dry type forming method - Google Patents
Dry type forming methodInfo
- Publication number
- JPS58224097A JPS58224097A JP10867382A JP10867382A JPS58224097A JP S58224097 A JPS58224097 A JP S58224097A JP 10867382 A JP10867382 A JP 10867382A JP 10867382 A JP10867382 A JP 10867382A JP S58224097 A JPS58224097 A JP S58224097A
- Authority
- JP
- Japan
- Prior art keywords
- molding
- raw material
- die
- material powder
- pressure
- 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.)
- Granted
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
- B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
- B30B15/022—Moulds for compacting material in powder, granular of pasta form
- B30B15/024—Moulds for compacting material in powder, granular of pasta form using elastic mould parts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、粉体の乾式成形方法の改良に係り、割れの
ない良好な成形体を得る成形方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a dry molding method for powder, and more particularly, to a molding method for obtaining a good molded product without cracks.
一般に磁石合金粉末を乾式成形装置により所定の形状に
圧縮成形するには、ダイスと下パンチとコアロッドによ
り構成した成形空間内に原料粉末を充填し、下パンチと
上パンチにより圧縮を行い、成形後に成形体をダイス上
面まで下パンチにより押し出しする方法を採っていた。Generally, in order to compression mold magnetic alloy powder into a predetermined shape using a dry molding device, the raw material powder is filled into a molding space made up of a die, a lower punch, and a core rod, and compressed by the lower punch and upper punch. The method used was to extrude the molded product to the upper surface of the die using a lower punch.
この成形体の押し出し詩に、成形体自身のいわゆるスプ
リングバックによる膨出のため、大きな摩擦力が成形空
間壁との間に生じ、成形体表面にひび割れ等の欠陥が発
生しやすく歩留りの低下を招いていた。従来、この摩擦
力緩和のためダイスの成形空間壁に抜きテーバを設定す
る方法が採られていたが、例えば小口径の円筒状で成形
高さの高いもの、中空の長尺品においては、特に上記緩
和程度が悪く、押し出し時に成形体と成形空間壁。During extrusion of this molded product, due to the bulge of the molded product itself due to so-called springback, a large frictional force is generated between it and the wall of the molding space, which tends to cause defects such as cracks on the surface of the molded product, resulting in a decrease in yield. I was invited. Conventionally, a method of setting a punching taper on the wall of the molding space of the die has been adopted to alleviate this frictional force, but this is especially true for small-diameter cylindrical products with a high molding height, or hollow long products. The above relaxation degree is poor, and the molded body and molding space wall during extrusion.
コアーロッド外周面に大きな摩擦力が作用し、割れのな
い良好な成形体は得られず、又、コアーロッドの引張に
よる破損の頻度が高くなるなど種々の問題があった。There were various problems such as a large frictional force acting on the outer peripheral surface of the core rod, making it impossible to obtain a good molded product without cracks, and increasing the frequency of breakage of the core rod due to tension.
この発明は、圧縮成形後の成形体の押し出し時に発生す
る成形体のスプリングバックによるダイスの成形空間壁
との摩擦力を減少させ、成形体のひび割れや金型の損傷
を防止し、割れのない良好な成形体を得ることができる
乾式成形方法を目的としている。This invention reduces the frictional force between the molding space wall of the die and the molding space wall due to the springback of the molded product that occurs during extrusion of the molded product after compression molding, prevents cracks in the molded product and damage to the mold, and prevents cracking. The purpose is to provide a dry molding method that can yield good molded products.
すなわち、この発明は、ダイス内の成形空間に充填され
た原料粉ｋを土、上パンチで圧縮成形覆る乾式成形方法
において、ダイスの成形空間をその背面のダイス内に加
圧流体を作動さμて収縮さＵたのち、成形空間に原料粉
末を充填して圧縮成形を行い、次いで加圧流体を解放し
て成形空間を拡張さけたのち成形体を取り出すことを要
旨とした乾式成形方法である。That is, this invention is a dry forming method in which raw material powder K filled in a forming space in a die is compressed and covered with soil and an upper punch, and the forming space of the die is controlled by applying a pressurized fluid into the die on the back side. This is a dry molding method that consists of filling the molding space with raw material powder, performing compression molding, and then releasing the pressurized fluid to expand the molding space before taking out the molded product. .
換言−りれば、原料粉末の充填前に成形空間を圧油等の
加圧流体の圧力によって収縮させておき、原料粉末の充
填後所定の圧縮成形を行ったのち−、加圧流体の圧力を
解放して成形空間を拡張復帰さけることにより、成形体
が自身のスプリングバックによっＣ膨脂しても内壁と成
形体どの摩擦力を著しく軽減させるものである。In other words, before filling the raw material powder, the molding space is contracted by the pressure of a pressurized fluid such as pressurized oil, and after filling the raw material powder and performing a prescribed compression molding, the pressure of the pressurized fluid is reduced. By releasing the molding space and preventing the molding space from expanding and returning, even if the molded product swells due to its own springback, the frictional force between the inner wall and the molded product can be significantly reduced.
この発明Ｃはダイスに穿設した成形空間を加圧流体によ
り収縮さＵる構成を必要とゴるが、パ例えば、実施例に
示づ如く、成形空間壁をダイスに嵌（人するタイスブツ
シ“によって形成し・ダイスブツシュの外周のダイスの
内壁部に加圧流体の流路あるいは溝部を配設する構成や
、成形空間壁周囲のダイス内に複数の立孔を穿設し−Ｃ
加圧流体の流路とする構成の他、多種の構成を利用でき
る。This invention C requires a configuration in which the molding space bored in the die is contracted by pressurized fluid. A configuration in which a pressurized fluid flow path or groove is provided on the inner wall of the die on the outer periphery of the die bush, or a plurality of vertical holes are bored in the die around the molding space wall.
In addition to the configuration as a flow path for pressurized fluid, various configurations can be used.
いずれの構成においても、原料粉末を成形空間内に充填
覆る前から成形圧縮完了よ−Ｃの間、ダイス内壁を構成
するダイスブツシュ又はダイス内壁自体を油圧）ｊによ
り収縮させたまま保持しな【ノればならず、例えば上記
のダイスブツシュの場合、成形体の＝Ｊ法に応じて油圧
力は１００ｋｑ４〜３０’ｏｏｈａ程度を必要とするた
め、拡縮の繰返しによる疲労に十分耐えるｌ賀のものを
使用覆る必要がある。In either configuration, the die bush constituting the inner wall of the die or the die inner wall itself is kept contracted by hydraulic pressure during the period from before the raw material powder is filled into the molding space until the molding and compression is completed. For example, in the case of the die bush mentioned above, a hydraulic pressure of about 100kq4 to 30'ooha is required depending on the =J method of the molded product, so use one that can sufficiently withstand fatigue due to repeated expansion and contraction. need to be covered.
また、ダイスにお１ノる加圧流体の流路あるいは溝部と
成形空間壁との距離、すなわち上記ダイスブツシュを挿
嵌した場合はダイスブツシュの厚みに相当する距離は、
成形空間内径の５〜１５％が必要であり、好ましくは成
形空間内径の１０％ｅある。In addition, the distance between the pressurized fluid passage or groove in the die and the wall of the molding space, that is, the distance corresponding to the thickness of the die bush when the die bush is inserted, is:
5 to 15% of the inner diameter of the molding space is required, preferably 10%e of the inner diameter of the molding space.
かかる距離が成形空間内径の５％未満であると、加圧流
体による成形空間の収縮度が大ぎくなり、金型を損傷し
やすく、又１５％を越えると、成形空間の収縮度が小さ
ずぎるため好ましくない。If this distance is less than 5% of the inner diameter of the molding space, the degree of contraction of the molding space by the pressurized fluid will be too large, easily damaging the mold, and if it exceeds 15%, the degree of contraction of the molding space will be too small. This is not desirable because it is too heavy.
この発明による圧縮成形可能な原料粉末どして、フェラ
イ］へ粉末、金属２合金粉末、セラミック粉末等すベＣ
の原料粉末に適用できる。また、対象成形品用法はいか
なるものでも適用可能であるが、リング状断面の長尺製
品や小口径の長尺円筒品、すなわら、Ｌ（長さ）とＤ〈
直径）との比Ｌ／Ｄ≧３の長尺品に著しい効果がある。The raw material powder that can be compressed according to the present invention, such as ferrite powder, metal 2 alloy powder, ceramic powder, etc.
Applicable to raw material powder. In addition, although any molded product can be used, it is applicable to long products with ring-shaped cross sections and long cylindrical products with small diameters, that is, L (length) and D
This effect is significant for long products with a ratio of L/D≧3 (diameter).
以下に、この発明を実施例の図面に基づいて説明りる。The present invention will be explained below based on drawings of embodiments.
ここではリング状断面長尺晶を成形する装置に適用した
場合を示づ。第１図は成形装置の縦断説明図である。Here, we will show a case in which the present invention is applied to an apparatus for forming long crystals with a ring-shaped cross section. FIG. 1 is a longitudinal sectional view of the molding apparatus.
ダイス（１）は図示しない基台に装Ｍ固定され、下パン
月２）及び土パンチ（３）は各々図示しないプレス昇降
装置に装着固定してあり、コアロッド（４）は下側のプ
レス昇降装置に下パンチ（２）の昇降に従動しないよう
別途固着し′である。The die (1) is mounted and fixed on a base (not shown), the lower pan 2) and soil punch (3) are each mounted and fixed on a press lifting device (not shown), and the core rod (4) is mounted on a press lifting device (not shown). It is separately fixed to the device so that it does not move as the lower punch (2) moves up and down.
この発明によるダイス（１）は、成形空間（５）壁をダ
イス（１）内に挿嵌さＶたダイスブツシュ（力で構成し
Ｃあり、ダイスブツシュ（７）はダイス（１）底面より
孔内に嵌入させて当て金（１ａ）をダイス（１）底面に
ボルト止めして固着する構成である。The die (1) according to the present invention has a molding space (5) wall inserted into the die (1) with a die bush (C), and the die bush (7) is inserted into the hole from the bottom of the die (1). This is a structure in which the metal plate (1a) is fitted and secured by bolting to the bottom surface of the die (1).
さらに、このダイスブツシュ（刀の外周中央部のダイス
（１）内に、加圧流体として作動油が流入りる圧油溝部
（８）を周設し、その溝部に油圧源（９）よりの配管を
接続しである。なお、ダイスブツシュ（７）の上端、上
端部付近のダイス（１）内には作動油漏出防止の／ｊめ
にＯリング（１０）が嵌着しである。Furthermore, a pressure oil groove (8) into which hydraulic oil flows as pressurized fluid is provided around the die (1) in the center of the outer periphery of the die bush, and a pipe from a hydraulic power source (9) is connected to the groove. An O-ring (10) is fitted inside the die (1) near the upper end of the die bush (7) to prevent leakage of hydraulic oil.
上記の構成において、原料粉末の成形空間（５）内への
充填前に、圧油溝部（８）へ所定圧力の作動油を供給し
−〔、ダイスブツシュ（力を外周よりの流体圧で収縮さ
せておく。次いで、成形空間（５）内へ原料粉末（６）
を充填し、下バンブー（２）、上パンチ（３）で加圧し
て圧縮成形を行う。圧縮成形を終了したとき油圧力を解
放し、ダイスブツシュ（７）の内径部を拡張すなわち復
帰させ、下パンチ（２）により成形体の押し出しを行い
、成形体を取り出づ。In the above configuration, before filling the raw material powder into the molding space (5), hydraulic oil at a predetermined pressure is supplied to the pressure oil groove (8). Next, feed the raw material powder (6) into the molding space (5).
is filled and pressurized with the lower bamboo (2) and upper punch (3) to perform compression molding. When the compression molding is completed, the hydraulic pressure is released, the inner diameter portion of the die bush (7) is expanded or returned to its original position, the molded body is extruded by the lower punch (2), and the molded body is taken out.
上述したこの発明方法において、磁性材料粉末を非磁場
成形する場合の金型材質の一例を示Ｊと、ダイスには３
５５Ｇの如き炭素鋼、ダイスブツシュには５ＫＤ−１１
等が適しており、また、ｆｉｌｌ中成形リ−る場合には
、ダイスに５ＵＳ３０６の如ぎ非磁性鋼、ダイスブツシ
ュに非磁性超硬質合金を適宜選定するどよい。In the method of the present invention described above, an example of the mold material when magnetic material powder is molded in a non-magnetic field is shown below.
Carbon steel like 55G, 5KD-11 for die bushing
In addition, when forming during filling, non-magnetic steel such as 5US306 may be appropriately selected for the die and non-magnetic super-hard alloy for the die bush.
上記の成形装置を使用し、原料粉末に希土類コバルト磁
石粉末としてＳｍ −Ｃｏ粉末を用いて外径１２ｍｍＸ
内径４ｍｍＸ長さ４４〜４５ｍｍ司法の成品を、この発
明方法により圧縮成形した。比較のため、従来装置によ
り同寸法の成品を作製した。なお、本発明方法の作動油
には鉱物性油を用いて１５００Ｍの圧力で使用し、圧縮
成形を行った。Using the above molding equipment, using Sm-Co powder as rare earth cobalt magnet powder as the raw material powder, the outer diameter was 12 mm.
A product having an inner diameter of 4 mm and a length of 44 to 45 mm was compression molded by the method of the present invention. For comparison, a product with the same dimensions was produced using conventional equipment. Note that mineral oil was used as the hydraulic oil in the method of the present invention, and compression molding was performed using it at a pressure of 1500 M.
また、上記寸法成品におけるスプリングバック量は０．
０５〜０．１ｍｍであった。In addition, the amount of springback in the product with the above dimensions is 0.
It was 0.05 to 0.1 mm.
圧縮成形の結果、従来り法による成品は、成形体表面に
ひび割れによる外観不良が３０％も発生し、コアロッド
の破損が多数見られた。As a result of compression molding, products produced using the conventional method had 30% poor appearance due to cracks on the surface of the molded product, and many core rods were damaged.
これに対して本発明方法による成品には、外観イ
′″１ｉ１ｆｉＯ°５％″１″０１１”９・ｖ７Ｄ
ｙＦ（ＤＷＩ損は皆無であった。On the other hand, the product produced by the method of the present invention has an external appearance.
'''1i1fiO°5%''1''011''9・v7D
yF (There were no DWI losses.
この発明方法によって圧縮成型すると、押し出し時の成
形空間壁と成形体との摩擦が著しく低減されているため
、外観不良発生が極めて少なく、金型の長寿命化が図ら
れることがわかる。It can be seen that when compression molding is performed by the method of the present invention, the friction between the molding space wall and the molded body during extrusion is significantly reduced, so that appearance defects are extremely rare and the life of the mold is extended.
第１図はこの発明による成形装置の縦断説明図である。
図中、１・・・ダイス、１ａ・・・当て金、２・・・下
パンチ、３・・・上パンチ、４・・・コアーロッド、５
・・・成形空間、６・・・原料粉末、７・・・ダイスブ
ツシュ、８・・・圧油溝部、９・・・油圧源、１０・・
・０リング。
出願人 住友特殊金属株式会社FIG. 1 is a longitudinal sectional view of a molding apparatus according to the present invention. In the figure, 1...Dice, 1a...Battery, 2...Lower punch, 3...Upper punch, 4...Core rod, 5
... Molding space, 6... Raw material powder, 7... Die bush, 8... Pressure oil groove, 9... Hydraulic source, 10...
・0 ring. Applicant: Sumitomo Special Metals Co., Ltd.
Claims (1)
パンチで圧縮成形する乾式成形方法において、ダイスの
成形空間をその背面のダイス内に加圧流体を作動させて
収縮させたのち、成形空間に原料粉末を充填して圧縮成
形を行ない、次いで加圧流体を解放して成形空間を拡張
させたのち成形体を取り出すことを特徴とする乾式成形
方法。1 In the dry molding method in which the raw material powder filled in the molding space in the die is compressed and molded using upper and lower punches, the molding space of the die is contracted by operating a pressurized fluid in the die on the back side, and then the molding is performed. A dry molding method characterized by filling a space with raw material powder and performing compression molding, then releasing a pressurized fluid to expand the molding space, and then taking out the molded body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10867382A JPS58224097A (en) | 1982-06-23 | 1982-06-23 | Dry type forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10867382A JPS58224097A (en) | 1982-06-23 | 1982-06-23 | Dry type forming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58224097A true JPS58224097A (en) | 1983-12-26 |
| JPS6235879B2 JPS6235879B2 (en) | 1987-08-04 |
Family
ID=14490769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10867382A Granted JPS58224097A (en) | 1982-06-23 | 1982-06-23 | Dry type forming method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58224097A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6167599A (en) * | 1984-09-10 | 1986-04-07 | Tohoku Metal Ind Ltd | Magnetic field forming method and forming device |
| CN102225467A (en) * | 2011-05-20 | 2011-10-26 | 西北工业大学 | Powder material forming pipe fitting forming mold and method |
-
1982
- 1982-06-23 JP JP10867382A patent/JPS58224097A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6167599A (en) * | 1984-09-10 | 1986-04-07 | Tohoku Metal Ind Ltd | Magnetic field forming method and forming device |
| CN102225467A (en) * | 2011-05-20 | 2011-10-26 | 西北工业大学 | Powder material forming pipe fitting forming mold and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6235879B2 (en) | 1987-08-04 |
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