JP3127587B2 - Manufacturing method of split mold - Google Patents

Manufacturing method of split mold

Info

Publication number
JP3127587B2
JP3127587B2 JP04197764A JP19776492A JP3127587B2 JP 3127587 B2 JP3127587 B2 JP 3127587B2 JP 04197764 A JP04197764 A JP 04197764A JP 19776492 A JP19776492 A JP 19776492A JP 3127587 B2 JP3127587 B2 JP 3127587B2
Authority
JP
Japan
Prior art keywords
inner ring
shrink
powder
mold
outer ring
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
Application number
JP04197764A
Other languages
Japanese (ja)
Other versions
JPH0615492A (en
Inventor
隆 小磯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP04197764A priority Critical patent/JP3127587B2/en
Publication of JPH0615492A publication Critical patent/JPH0615492A/en
Application granted granted Critical
Publication of JP3127587B2 publication Critical patent/JP3127587B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B15/00Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/022Moulds for compacting material in powder, granular of pasta form

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】この発明は粉末成形の金型(特に
ダイ)の製造方法に関する。ロ−タリ−タイプのカ−エ
アコン用ロ−タ−、ベ−ンタイプの油圧ポンプのロ−タ
−などのように円柱形で外周から内部に向けて細長い溝
を有する製品などの粉末成形用ダイの製造方法に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a metal mold (particularly, a die) for powder molding. Powder molding dies for products having a columnar shape and elongated grooves from the outer periphery toward the inside, such as rotor type car air conditioner rotors and vane type hydraulic pump rotors. And a method for producing the same.

【0002】[0002]

【従来の技術】粉末成形用の金型は例えば、「焼結部品
−その設計と製造−」日本粉末冶金工業会編著,p20
9図4.79焼き嵌めダイの構造などに示される。これ
を図8と図9によって説明する。始めに内環Uと外環W
とを成形する。外環Wは強い引っ張り力に耐えられるよ
うに厚い円筒壁を持つ部材である。内環Uは単なる円筒
または予め放射状などの形状を有する円筒である。後者
の場合はもちろん適当な加工代を付けてある。内環Uを
外環Wに焼き嵌めする。さらに、ワイヤ−カットまたは
放電加工、ラッピングによって所定の構造に加工し所定
の精度に仕上げられる。
2. Description of the Related Art A mold for powder molding is described in, for example, "Sintered Parts-Design and Manufacturing-", edited by Japan Powder Metallurgy Association, p.
9 Fig. 4.79 Shown in the structure of shrink fit die etc. This will be described with reference to FIGS. First, inner ring U and outer ring W
And molding. The outer ring W is a member having a thick cylindrical wall so as to withstand a strong tensile force. The inner ring U is a simple cylinder or a cylinder having a shape such as a radial shape in advance. In the latter case, of course, an appropriate processing allowance is provided. The inner ring U is shrink-fitted to the outer ring W. Further, it is processed into a predetermined structure by wire cutting, electric discharge machining, or lapping, and is finished to a predetermined accuracy.

【0003】内環Uが単なる円筒の場合は図9に示す形
状を得る為に放射状の内向きのリブ(分岐構造物という
ことにする)が残るように残部を除去する。多くの場合
は単なる円筒を内環として焼き嵌後の加工で形状を作り
出す。粉末成形用の金型の精度の要求は1/100mm
(10μm)程度で極めて厳しいので焼き嵌め後に加工
をするのである。
In the case where the inner ring U is a simple cylinder, the remaining portion is removed so that radial inward ribs (referred to as branch structures) remain to obtain the shape shown in FIG. In many cases, a simple cylinder is used as an inner ring to create a shape by processing after shrink fitting. The precision requirement of the mold for powder molding is 1 / 100mm
(10 μm), which is extremely severe, so that it is processed after shrink fitting.

【0004】金型には耐摩耗性、耐圧性、疲れ強さ、靱
性などが要求される。粉体を押さえる圧力は6〜10t
/cm2 程度であるので耐圧性が必要なのは当然である
がこれは外環Wによって受けることができる。内環の場
合は特に耐摩耗性が重要である。そこで内環Uは超硬合
金、工具鋼、高速度鋼等が使用される。しかも内環Uは
構造の複雑さなどに無関係で一体物として作られてい
た。
A mold is required to have wear resistance, pressure resistance, fatigue strength, toughness and the like. Pressure to hold powder is 6-10t
/ Cm 2 , it is natural that pressure resistance is required, but this can be received by the outer ring W. In the case of the inner ring, wear resistance is particularly important. Therefore, the inner ring U is made of cemented carbide, tool steel, high-speed steel, or the like. Moreover, the inner ring U was made as an integral body regardless of the complexity of the structure.

【0005】[0005]

【発明が解決しようとする課題】図10に内環の一例に
係る分岐構造物の根元の部分の拡大斜視図を示す。一体
物のダイ内環を外環に焼き嵌めしたダイでは、分岐構造
物の幅Bや根元の彎曲Rが大きく、高さLが小さい場
合、または圧粉体の成形方向の厚みが小さい場合は問題
ない。しかし分岐構造物の幅B、彎曲Rが小さく、高さ
Lが長い、あるいは圧粉体厚みが大きいというような場
合には、従来から使用される一体型の内環には問題があ
る。このような場合に粉体に強い力を掛けると、根元の
部分に強い応力が作用する。ために粉末成形中に根元の
部分(Rの部分)に亀裂が発生し易い。
FIG. 10 is an enlarged perspective view of a root portion of a branch structure according to an example of an inner ring. In the die in which the inner ring of the integrated die is shrink-fitted to the outer ring, when the width B and the root curvature R of the branch structure are large and the height L is small, or when the thickness of the compact in the molding direction is small, no problem. However, when the width B and the curvature R of the branch structure are small and the height L is long or the thickness of the green compact is large, there is a problem in the conventionally used integral inner ring. In such a case, when a strong force is applied to the powder, a strong stress acts on the root portion. Therefore, cracks are likely to occur in the root portion (R portion) during powder molding.

【0006】その原因を次に説明する。図11はダイ内
環と粉末を上からみたものである。ダイの内部空間(ダ
イキャビテイ)に粉末を充填する。これは粉体の自重で
キャビテイに入って行くのである。これをパンチで押さ
える。粉末を均等に充填すべきであるがこれがなかなか
難しい。分岐構造物があるとこれと壁によって挟まれた
狭小な部分には粉末が入り難い。このような局所的な不
均一があるので、たとえばこの例では、分岐構造物の両
側に圧力P1 とP2 が食い違う。圧力差が構造物の根元
の部分に強い曲げモ−メントを発生する。ためにこの部
分に亀裂が発生し易いのである。
The cause will be described below. FIG. 11 shows the die inner ring and the powder as viewed from above. The powder is filled in the inner space (die cavity) of the die. It enters the cavity by its own weight. Hold this with a punch. The powder should be filled evenly, but this is difficult. If there is a branched structure, it is difficult for powder to enter a narrow portion sandwiched between the branched structure and the wall. Due to such local non-uniformity, for example, in this example, the pressures P 1 and P 2 are offset on both sides of the branch structure. The pressure difference creates a strong bending moment at the root of the structure. Therefore, a crack is easily generated in this portion.

【0007】当然この現象は、圧粉体密度が高い程、圧
粉体厚さが厚い程、発生し易い。この対策として、金型
構造を変更して、前述の分岐構造物を金型の一部とせ
ず、これらをコア−ロッドで成形するようにする方法が
ある。コア−ロッドは中心の穴を開けるための装置であ
るがこれを構造物の成形にも利用するのである。しかし
これとて用途は狭く限られている。圧粉体厚さ(軸方向
の高さ)が大きい場合には、ダイセットが大きくなり過
ぎて、プレスに入らない。この場合にはコア−ロッドを
利用できない。内環に構造体を作ってこれによって成形
しなければならない。
Naturally, this phenomenon is more likely to occur as the density of the green compact is higher and the thickness of the green compact is larger. As a countermeasure, there is a method in which the mold structure is changed so that the branch structure is not formed as a part of the mold but is formed by a core rod. The core rod is a device for making a hole in the center, which is also used for forming a structure. However, their use has been narrow and limited. If the green compact thickness (height in the axial direction) is large, the die set becomes too large to enter the press. In this case, the core rod cannot be used. A structure must be made in the inner ring and molded by this.

【0008】粉体の内部の圧力に不均等があるからこの
ような亀裂の問題が発生するのである。これを解決する
には、粉体を均一に充填し分岐構造物の両側での圧力が
1=P2 となるようにすれば良い。粉末均一充填のた
めに、アンダ−フィル、オ−バ−フィル等の粉末冶金の
技術がある。しかしこれもダイキャビテイの内部構造が
単純である場合に有効であるが、複雑な場合は均一充填
が難しい。また製品の高さ(軸方向の高さ)が大きいと
ダイキャビテイ内の空気をどうして逃がすのかというこ
とが問題になる。結局分岐構造物が複雑であると粉体の
均一充填ができない。
[0008] The unevenness of the pressure inside the powder causes such a cracking problem. In order to solve this, it is only necessary to uniformly fill the powder so that the pressure on both sides of the branched structure becomes P 1 = P 2 . There are powder metallurgy techniques such as underfill and overfill for uniform filling of powder. However, this is also effective when the internal structure of the die cavity is simple, but when the internal structure is complicated, uniform filling is difficult. Also, if the height of the product (height in the axial direction) is large, it becomes a problem how air in the die cavity is released. After all, if the branched structure is complicated, uniform filling of the powder cannot be achieved.

【0009】[0009]

【課題を解決するための手段】本発明の分割金型の製造
方法は、中央に穴を有する外環と、外環の穴に嵌め込ま
れる内環とを組み合わせ、内部に分岐構造物を有する粉
末成形用の金型を製造する方法であって、内環を複数個
の部分材に分割するように設計し、内環になるべき部分
材と外環とを製造し、部分材の相互に接触する部分を高
精度に加工し、外環の穴の中に部分材を焼嵌めした後、
内環の内側に必要な分岐構造物を所定の精度で加工する
ことを特徴とする。
SUMMARY OF THE INVENTION A method of manufacturing a split mold according to the present invention is a method of combining an outer ring having a hole at the center with an inner ring fitted into a hole of the outer ring, and having a branched structure therein. A method of manufacturing a molding die, in which the inner ring is designed to be divided into a plurality of partial materials, the partial material to be the inner ring and the outer ring are manufactured, and the partial materials are in contact with each other. After processing the part to be done with high precision and shrink fitting the part material into the hole of the outer ring,
The present invention is characterized in that a necessary branch structure inside the inner ring is machined with a predetermined accuracy.

【0010】[0010]

【作用】従来一体物であった内環を、複数個の構成要素
に分割して製造し、これを外環に焼き嵌めしてから内部
の構造を成形したので、粉体の供給が不均一で突起片等
の両側で大きい圧力差があってもこれがためにR部等に
亀裂が入ったりしない。また、焼き嵌め代を均一にする
ことができるから、繰り返しの成形によってもダイの構
成部分間に位置ずれが起こらない。長寿命、高精度の金
型を製造することができる。
The inner ring, which was conventionally a single piece, was manufactured by dividing it into a plurality of components, which were shrink-fitted to the outer ring, and then the inner structure was molded. Therefore, even if there is a large pressure difference on both sides of the projection piece or the like, this does not cause a crack in the R portion or the like. In addition, since the shrink fit can be made uniform, no misalignment occurs between the components of the die even by repeated molding. A long-life, high-precision mold can be manufactured.

【0011】[0011]

【実施例】本発明をロ−タリ−エアコンコンプレッサ−
のロ−タの製造用の金型に適用した。比較のために従来
法で行った場合の例も示す。図1にロ−タ−の平面図を
示す。図2にAO12 B断面図を示す。これは円柱形
の本体7を有する。本体の側面から中心に掛けて5つの
細長い溝8を切欠きさらに中心に中心孔10を穿った形
状である。また溝8の奥は小さい円孔部9となってい
る。溝8はベ−ンの出入りする空間であるがこれは放射
状ではなく半径方向から少しずれている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is applied to a rotary air conditioner compressor.
This was applied to a mold for manufacturing the rotor of No. 1. For comparison, an example of a case where the conventional method is used is also shown. FIG. 1 shows a plan view of the rotor. FIG. 2 shows a cross-sectional view of AO 1 O 2 B. It has a cylindrical body 7. The shape is such that five elongated grooves 8 are cut out from the side of the main body to the center, and a center hole 10 is formed at the center. The depth of the groove 8 is a small circular hole 9. The groove 8 is a space where the vane enters and exits, but is not radial but slightly offset from the radial direction.

【0012】溝8の延長線と中心O2 との距離は5mm
である。溝8の幅は3.7mm、円柱の直径は60m
m、中心孔10の直径は18mmである。また円孔部9
の中心O1 から溝に平行に引いた直線AO1 にO2 から
下した垂線の足からO1 までの距離は15mmである。
軸方向の長さは54mmである。これは円盤状というよ
り軸方向に長い柱状の製品である。
The distance between the extension of the groove 8 and the center O 2 is 5 mm
It is. The width of the groove 8 is 3.7 mm, and the diameter of the cylinder is 60 m.
m, the diameter of the center hole 10 is 18 mm. In addition, the circular hole 9
The distance from the center O 1 of the perpendicular foot that beat from O 2 in a straight line AO 1 drawn parallel to the groove to O 1 is 15 mm.
The axial length is 54 mm. This is a column-shaped product that is longer in the axial direction than a disk.

【0013】これを製造するための金型は当然このよう
に長手方向に長くて、内部に5つの分岐構造物を持つ。
これらは長手方向に伸びているから、粉末を上から充填
する場合均一に充填することが難しい。溝が半径方向に
なく、螺旋状に存在するから、溝に対応する分岐構造物
の両面での充填状態が同一にならない。使用粉末は、鉄
(Fe)+3%銅(Cu)+1%黒鉛(C)+0.8%
潤滑剤である。圧粉体密度は6.7g/cm3 で成形し
た。
[0013] The mold for producing this is naturally long in the longitudinal direction and has five branch structures inside.
Since these extend in the longitudinal direction, it is difficult to fill the powder uniformly from above. Since the grooves are not present in the radial direction but exist in a spiral shape, the filling state on both surfaces of the branch structure corresponding to the grooves is not the same. Powder used is iron (Fe) + 3% copper (Cu) + 1% graphite (C) + 0.8%
It is a lubricant. The green compact was formed at a density of 6.7 g / cm 3 .

【0014】[比較例](一体物の内環) 〔使用金型〕 高速度鋼(焼き入れ品)によって一体物
の内環を製作した。焼嵌め代は0.15%である。これ
を円筒状の外環に焼嵌めし、内環の内側を所望のダイ内
側形状にワイヤ−カットで仕上げた。これは従来どおり
の製造方法である。これに前記の粉末を充填し、パンチ
で押さえて、ロ−タ−を成形した。 〔粉末成形結果〕 成形個数5個目で、ダイ凸部(図1
0のRの部分)に亀裂が発生した。
[Comparative Example] (Inner ring of one piece) [Mold used] An inner ring of one piece was made of high-speed steel (quenched product). The shrink fit is 0.15%. This was shrink-fitted to a cylindrical outer ring, and the inner side of the inner ring was finished by wire-cut into a desired die inner shape. This is a conventional manufacturing method. This was filled with the powder and pressed with a punch to form a rotor. [Powder Molding Result] With the fifth molded piece, the die protrusion (Fig. 1)
(R portion of 0) was cracked.

【0015】[比較例] (分割内環であるが、仕上
げてから焼嵌めしたもの) 〔使用金型〕 内環を、図3と図4に示すような構成要
素に分けた。ここでは仮に突起片1と円弧片2というこ
とにする。突起片1が5個、円弧片2が5つということ
なる。高速度鋼を熱処理し、内環の構成要素である突起
片1と、円弧片2を5つずつ製作した。つまり図3、図
4に示すように、最終形状にまで形成したのである。上
下面を除くすべての面を研磨加工した。ここで突起片1
は基部3、突板部4、円頭部5よりなるがこれらの細部
も最終的な形状にまで仕上げ加工したのである。円弧片
2は円弧状で両側に段部6を有するがこれも仕上げ加工
している。これら内環の構成部品を予め準備していた外
環に焼嵌めして金型を製作した。図5がこの状態を示
す。製作過程において焼嵌め代によって製品の円孔部9
の中心O1 の位置が変化する。そこで焼嵌め代を変化さ
せ、トライアルアンドエラ−によってO1 の位置精度を
確保した。これに前記の粉末を充填し、パンチで押さえ
て、ロ−タ−を成形した。
[Comparative Example] (Divided inner ring, which is finished and shrink-fitted) [Mold used] The inner ring was divided into components as shown in FIGS. Here, the projection piece 1 and the arc piece 2 are tentatively assumed. This means that there are five protrusions 1 and five arcs 2. The high-speed steel was heat-treated to produce five projection pieces 1 and five arc pieces 2 as components of the inner ring. That is, as shown in FIGS. 3 and 4, the final shape was formed. All surfaces except the upper and lower surfaces were polished. Here, the projection piece 1
Consists of a base 3, a veneer 4, and a circular head 5, but these details are also finished to the final shape. The arc piece 2 has an arc shape and has step portions 6 on both sides, which are also finished. The components of the inner ring were shrink-fitted to a previously prepared outer ring to produce a mold. FIG. 5 shows this state. Circular hole 9 of the product due to shrinkage allowance in the manufacturing process
Of the center O 1 changes. So to change the shrink fitting allowance, trial and error - to ensure the positional accuracy of the O 1 by. This was filled with the powder and pressed with a punch to form a rotor.

【0016】〔粉末成形結果〕 ロ−タ−を10万個成
形したがダイ凸部で亀裂が発生しなかった。しかし5万
個の成形で、O1 の位置が0.07mmずれていること
が判明した。つまり強度の点では問題ないが、位置精度
の点で未だに難点がある。
[Powder Molding Result] Although 100,000 rotors were molded, no crack was generated at the die convex portion. However, 50,000 of the molding, the position of O 1 has been found to be shifted 0.07 mm. In other words, there is no problem in terms of strength, but there are still difficulties in terms of positional accuracy.

【0017】〔原因〕 内環の構成部品である突起片1
と円弧片2とを、焼嵌めする前に仕上げているために、
焼嵌め代を一定にすることができず、焼嵌め代が少なく
なり、粉末成形時の圧力差により、各構成部品間の微小
な隙間が高圧によって次第に位置ずれを引き起こしたた
めである。つまりトライアルアンドエラ−で位置を合わ
せているというものの、焼嵌め代は部分によって異な
る。多数回の成形によって焼嵌め代の少ない所と厚い所
の差が次第に現れるのである。 〔対策〕 一定の焼嵌め代をとっておいて焼嵌めし、そ
の後に内側の分岐構成物を製作すれば良い。こうすれば
金型の破損や、位置ずれを防止できるはずである。本発
明はこのような考察に基づくものである。
[Cause] The projection 1 as a component of the inner ring
And the arc piece 2 are finished before shrink fitting.
This is because the shrink-fit allowance could not be made constant, the shrink-fit allowance decreased, and a small gap between the components gradually shifted due to a high pressure due to a pressure difference during powder molding. In other words, although the position is adjusted by trial and error, the shrink fitting margin differs depending on the part. The difference between the place where the shrink fit is small and the place where the shrink fit is large gradually appears by many times of forming. [Countermeasure] Shrink-fitting may be performed with a certain shrink-fit margin, and then the inner branching component may be manufactured. In this way, damage to the mold and displacement can be prevented. The present invention is based on such considerations.

【0018】[実施例](分割内環であり先に焼嵌め
し内側構成物を製作し仕上げたもの) 内環を構成部品に分割するのは前例と同じであるが、始
めから加工しない。つまり内環を突起片1と、円弧片2
に分割するが、円弧片2は、図6のように最終的な形状
ではなく、内部に厚い加工代13(破線で示し斜線を附
した)を伴っている。突起片1も先端は太い分岐になっ
ており、厚い加工代14を有する。部品の段階で仕上げ
加工するのは、両部材を焼嵌めする部分だけである。図
7に突起片1の加工箇所を部分斜線によって示す。基部
3の側面15、前小面16、突き合わせ面17を仕上げ
加工するがこれらは円弧片2と接触する部分だからであ
る。基部3の裏面18の加工するがこれは外環に接触す
る部分だからである。円弧片2は、図6の2点鎖線で示
す部分まである形状であるが、これも段部6の内面と裏
面19を仕上げ加工する。
[Embodiment] (Divided inner ring which has been shrink-fitted to produce an inner component and finished) The inner ring is divided into components as in the previous example, but is not processed from the beginning. That is, the inner ring is composed of the projection 1 and the arc 2
However, the arc piece 2 does not have a final shape as shown in FIG. 6 but has a thick machining allowance 13 (shown by a broken line and hatched). The protruding piece 1 also has a thick branch at the tip, and has a thick machining allowance 14. Only the part where both members are shrink-fitted is finished at the part stage. FIG. 7 shows a portion where the projection piece 1 is processed by a partial oblique line. The side surface 15, the front small surface 16, and the butted surface 17 of the base 3 are finish-processed, because these are the portions that come into contact with the arc piece 2. The rear surface 18 of the base 3 is processed because it is a portion that comes into contact with the outer ring. The arc piece 2 has a shape up to a portion indicated by a two-dot chain line in FIG. 6, and this also finishes the inner surface and the back surface 19 of the step portion 6.

【0019】内環を組み立てた後、予め準備している外
環に対して0.15%の焼嵌め代で焼嵌めする。すると
図6の2点鎖線で示すような形状になる。この後、ワイ
ヤ−カットにより、破線と斜線で示す部分を除去する。
すると実線で示すダイの内部構造が得られる。焼嵌めの
後で細部の加工をするので位置のずれが起こらない。
〔粉末成形結果〕 ロ−タ−を10万個成形した。金型
は破損しなかった。また円孔部9の中心O1 の位置ずれ
も起こらなかった。極めて堅牢で寸法精度の高い優れた
金型である。
After assembling the inner ring, the inner ring is shrink-fitted to the outer ring prepared in advance with a shrinkage allowance of 0.15%. Then, the shape becomes as shown by the two-dot chain line in FIG. Thereafter, portions shown by broken lines and oblique lines are removed by wire cutting.
Then, the internal structure of the die indicated by the solid line is obtained. Since the details are machined after shrink fitting, no misalignment occurs.
[Powder Molding Result] 100,000 rotors were molded. The mold did not break. Also did not occur even when the position shift of the center O 1 of the circular hole portion 9. It is a very strong and excellent dimensional precision mold.

【0020】[0020]

【発明の効果】本発明の粉末成形金型の製造方法は、従
来一体物であった内環を、幾つかの構成部材に分割し、
組み合わせる部分は仕上げ加工し、その他の部分は加工
代をつけたままで形成し、これらを外環に焼嵌めしてか
ら内環の内部の構成物を加工する。一体物を加工する
と、鋭い挟角の部分が弱くなり、粉末成形を繰り返すと
亀裂が入って破損しやすい。本発明では鋭い挟角の部分
が始めから存在しないので応力集中が起こらず粉末の圧
力差があっても破損しない。長寿命の金型を提供するこ
とができる。金型は高価な部品であり、成形製品のコス
トのかなりの部分を占める。本発明は金型の価額を実効
的に引き下げることができるから焼結製品のコストの引
き下げに寄与することができる。
According to the method for manufacturing a powder molding die of the present invention, the inner ring, which has been conventionally a single body, is divided into several constituent members.
The parts to be combined are finished and the other parts are formed with a working allowance, and they are shrink-fitted to the outer ring before processing the components inside the inner ring. When processing the one-piece, the sharp narrow portion becomes weak, and when the powder molding is repeated, cracks are formed and the powder is easily broken. In the present invention, since there is no sharp included portion from the beginning, stress concentration does not occur and the powder does not break even if there is a pressure difference. A long-life mold can be provided. Molds are expensive parts and represent a significant portion of the cost of a molded product. Since the present invention can effectively reduce the value of the mold, it can contribute to the reduction of the cost of the sintered product.

【0021】また内環を分割するから新たな長所が生ず
る。2種類以上の構成部材に分けるからこれらの部材の
材料を変えることができる。内環の構成部品の内激しく
摩耗する部分を超硬合金に、他を鋼にすれば金型寿命を
長くすることが出来、金型の価額を引き下げることがで
きる。
Further, since the inner ring is divided, new merits arise. Since it is divided into two or more types of constituent members, the materials of these members can be changed. If the parts of the inner ring that are severely worn out are made of cemented carbide and the others are made of steel, the life of the mold can be extended, and the value of the mold can be reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施例に係る金型によって製造される
べきロ−タ−の平面図。
FIG. 1 is a plan view of a rotor to be manufactured by a mold according to an embodiment of the present invention.

【図2】図1に於いてAO12 B断面図。FIG. 2 is a cross-sectional view of AO 1 O 2 B in FIG.

【図3】内環を構成部材に分割した物の一つであり、最
終的な形状にまで形成された突起片を示す。
FIG. 3 shows one of the components obtained by dividing an inner ring into constituent members, and shows a projection piece formed to a final shape.

【図4】内環を構成部材に分割した物の一つであり、最
終的な形状にまで形成された円弧片を示す。
FIG. 4 shows one of the components obtained by dividing the inner ring into constituent members, and shows an arc piece formed to a final shape.

【図5】前記の突起片と円弧片とを焼嵌めした状態を示
す斜視図。
FIG. 5 is a perspective view showing a state in which the projection piece and the arc piece are shrink-fitted.

【図6】本発明の実施例の一工程を示し、加工代を付け
た突起片と円弧片とを組み合わせた状態を示す斜視図。
FIG. 6 is a perspective view showing one step of the embodiment of the present invention, and showing a state in which a projection piece with a machining allowance and an arc piece are combined.

【図7】本発明の実施例において分割した内環の構成部
材の一例を示す。
FIG. 7 shows an example of a component member of an inner ring divided in the embodiment of the present invention.

【図8】従来例に係る粉末成形金型において内環を外環
に焼き嵌めする前の形状を示す斜視図。
FIG. 8 is a perspective view showing a shape before shrink-fitting an inner ring to an outer ring in a powder molding die according to a conventional example.

【図9】従来例により外環に内環を焼き嵌めして内環内
部に構成物を形成した状態の斜視図。
FIG. 9 is a perspective view showing a state in which a component is formed inside the inner ring by shrink-fitting the inner ring to the outer ring according to a conventional example.

【図10】一体型の内環の一部の斜視図。FIG. 10 is a perspective view of a part of an integrated inner ring.

【図11】ダイの内環を上から見た平面図。FIG. 11 is a plan view of the inner ring of the die as viewed from above.

【符号の説明】[Explanation of symbols]

1 突起片 2 円弧片 3 基部 4 突板部 5 円頭部 6 段部 7 本体 8 溝 9 円孔部 10 中心孔 13 加工代 14 加工代 DESCRIPTION OF SYMBOLS 1 Projection piece 2 Circular piece 3 Base 4 Projection plate part 5 Head part 6 Step part 7 Main body 8 Groove 9 Circular hole part 10 Center hole 13 Processing margin 14 Processing margin

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 中央に穴を有する外環と、外環の穴に嵌
め込まれる内環とを組み合わせ、内部に分岐構造物を有
する粉末成形用の金型を製造する方法であって、内環を
複数個の部分材に分割するように設計し、内環になるべ
き部分材と外環とを製造し、部分材の相互に接触する部
分を高精度に加工し、外環の穴の中に部分材を焼き嵌し
た後、内環の内側に必要な分岐構造物を所定の精度で加
工することを特徴とする分割金型の製造方法。
1. A method for manufacturing a powder molding die having a branched structure therein by combining an outer ring having a hole in the center and an inner ring fitted into a hole of the outer ring. Is designed to be divided into a plurality of sub-materials, the sub-material to be the inner ring and the outer ring are manufactured, and the mutually contacting parts of the sub-materials are machined with high precision, A method for manufacturing a split mold, wherein a required branch structure is machined with a predetermined accuracy inside an inner ring after shrink-fitting a partial material into the inner ring.
JP04197764A 1992-06-30 1992-06-30 Manufacturing method of split mold Expired - Lifetime JP3127587B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP04197764A JP3127587B2 (en) 1992-06-30 1992-06-30 Manufacturing method of split mold

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP04197764A JP3127587B2 (en) 1992-06-30 1992-06-30 Manufacturing method of split mold

Publications (2)

Publication Number Publication Date
JPH0615492A JPH0615492A (en) 1994-01-25
JP3127587B2 true JP3127587B2 (en) 2001-01-29

Family

ID=16379966

Family Applications (1)

Application Number Title Priority Date Filing Date
JP04197764A Expired - Lifetime JP3127587B2 (en) 1992-06-30 1992-06-30 Manufacturing method of split mold

Country Status (1)

Country Link
JP (1) JP3127587B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0759421A1 (en) * 1995-08-17 1997-02-26 BP Chemicals Limited Process for the purification of a C2 to C4 carboxylic acid and/or anhydride having impurities
US6688154B2 (en) 2001-07-19 2004-02-10 Showa Denko Kabushiki Kaisha Die for forging rotor, forge production system and forging method using the die, and rotor
JP2013198930A (en) * 2012-03-26 2013-10-03 Hitachi Powdered Metals Co Ltd Green compact molding die device for plate-like component
CN114192777B (en) * 2021-11-29 2023-09-22 九江市杰尼新材料有限公司 Forming module of cylindricality tantalum ingot

Also Published As

Publication number Publication date
JPH0615492A (en) 1994-01-25

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