JP2013198930A

JP2013198930A - Green compact molding die device for plate-like component

Info

Publication number: JP2013198930A
Application number: JP2012069616A
Authority: JP
Inventors: Hiroaki Kondo; 宏明近藤; Kazunori Maekawa; 和則前川; Chio Ishihara; 千生石原
Original assignee: Hitachi Powdered Metals Co Ltd
Current assignee: Resonac Corp
Priority date: 2012-03-26
Filing date: 2012-03-26
Publication date: 2013-10-03

Abstract

PROBLEM TO BE SOLVED: To provide a green compact molding die device for a plate-like component capable of preventing a crack having an inner corner part of a die as a start point from being generated, even when carrying out compression molding at high pressure, and allowing exact molding even when using raw material powder of high hardness.SOLUTION: A core member 20 for forming two cavities 50 by partitioning an inside of a die hole into two is inserted in the center of the inside of the die hole of a die 10, and raw material powder supplied into each cavity 50 is compressed, by upper and lower punches 40 inserted freely slidably into each cavity 50, to form a green compact of a plate-like component. A stress at compression molding applied to an inner corner part is leaked to a junction boundary face between an inner wall face and an outer wall face 21, by forming the right-angled inner corner part of the cavity 50 of the inside face of the mold hole and the outer wall face 21 of the core member 20, and a crack having the inner corner part of the die as a start point is thereby prevented from being generated, to allow molding at high pressure.

Description

本発明は、平板状部品を粉末冶金法で得る過程において、原料粉末を該部品に近似した圧粉体に圧縮成形する際に用いる圧粉体成形金型装置に関する。 The present invention relates to a green compact mold apparatus used when compression molding a raw material powder into a green compact similar to the part in the process of obtaining a flat part by powder metallurgy.

金型内のキャビティに供給した原料粉末をパンチで圧縮することにより目的の部品形状に近似した圧粉体を成形し、この圧粉体を焼結して部品を得る粉末冶金法は、精密、かつ複雑な形状のものを大量生産可能な方法として知られている。例えば、軸受等の円筒状部品は、金型のダイス内に形成された上下方向に開口する円筒状キャビティに原料粉末を供給し、キャビティ内に摺動自在に挿入される上下のパンチで原料粉末を軸方向に圧縮して成形される（特許文献１等参照）。 The powder metallurgy method, which compresses the raw material powder supplied to the cavity in the mold with a punch to form a green compact that approximates the target part shape and sinters this green compact to obtain a part, is precise, It is also known as a method capable of mass production of complicated shapes. For example, for cylindrical parts such as bearings, raw material powder is supplied to a cylindrical cavity formed in a die of a mold and opened in the vertical direction, and the upper and lower punches are slidably inserted into the cavity. Are molded in the axial direction (see Patent Document 1).

さて、粉末冶金法によって、図１７に示すような均一厚さの平板状部品１００を製造することが試みられている。このような平板状部品１００の圧粉体を、従来の圧粉体成形法を適用して成形するには、図１８および図１９に示すように、ダイス１１０内に形成した平板状部品に対応するスリット状のキャビティ１２０に原料粉末を供給し、キャビティ１２０内に挿入される上下のパンチ１３０，１４０で原料粉末を圧縮して平板状部品１００の素材となる圧粉体１００Ａを得る。 Now, an attempt has been made to produce a flat plate component 100 having a uniform thickness as shown in FIG. 17 by powder metallurgy. In order to form the green compact of the flat plate component 100 by applying the conventional green compact forming method, as shown in FIGS. 18 and 19, it corresponds to the flat plate component formed in the die 110. The raw material powder is supplied to the slit-shaped cavity 120 to be compressed, and the raw material powder is compressed by the upper and lower punches 130 and 140 inserted into the cavity 120 to obtain a green compact 100 </ b> A that becomes the material of the flat plate component 100.

特開２００４−２５１３０２号公報JP 2004-251302 A

ところで、粉末冶金法で製造される磁気部品は、その密度が磁気特性に密接に関係するため高密度に成形される。この場合、粉末冶金法による一般の機械部品に比して高い成形圧力で原料粉末を圧縮成形することで行われる。このような場合にダイスには高い応力が加わることとなり、例えばダイスのキャビティの内隅部でクラックが生じ易い。また、このようなクラックは硬さの高い原料粉末を用いる場合により顕著に生じる。例えば、図１７で示したような平板状部品１００の圧粉体を、図１８および図１９で示した金型装置によって成形すると、図２０に示すように、ダイス１１０のキャビティ１２０の直角状の内隅部１２１にパンチ圧力による応力が集中し、その内隅部１２１を起点としてクラック（矢印Ｈで示す）が生じる場合があった。クラックが生じたダイスは使用不能となり、したがって高コスト化や生産性の低下を招くといった問題を招くことになるため、改善策が要望された。 By the way, magnetic parts manufactured by powder metallurgy are molded at high density because the density is closely related to magnetic properties. In this case, the raw material powder is compression-molded at a molding pressure higher than that of a general mechanical component by powder metallurgy. In such a case, a high stress is applied to the die, and for example, cracks are likely to occur at the inner corner of the die cavity. Such cracks are more prominent when using a raw material powder having high hardness. For example, when the green compact of the flat plate-like component 100 as shown in FIG. 17 is molded by the mold apparatus shown in FIGS. 18 and 19, as shown in FIG. 20, the right-angled shape of the cavity 120 of the die 110 is formed. In some cases, the stress due to the punch pressure is concentrated on the inner corner 121, and a crack (indicated by an arrow H) occurs from the inner corner 121 as a starting point. Since the die having cracks becomes unusable, and thus causes problems such as high cost and low productivity, an improvement measure has been demanded.

本発明は上記事情に鑑みてなされたものであり、その主たる目的は、高圧で圧縮成形を行った場合にも金型の内隅部を起点としたクラック発生を防ぐことができ、硬さの高い原料粉末を用いた場合であっても適確に成形することができる平板状部品の圧粉体成形金型装置を提供することにある。 The present invention has been made in view of the above circumstances, and its main purpose is to prevent the occurrence of cracks starting from the inner corner of the mold even when compression molding is performed at a high pressure. An object of the present invention is to provide a green compact mold apparatus for flat plate parts that can be accurately formed even when a high raw material powder is used.

本発明の平板状部品の圧粉体成形金型装置は、平坦な内壁面を有し、上下方向に貫通する型孔が形成されたダイスと、このダイスの前記型孔に挿入され、挿入状態で、前記内壁面に対向し、該内壁面との間に前記平板状部品の厚さに対応したキャビティを形成する外壁面を有するコア部材と、前記型孔の前記内壁面または前記コア部材の前記外壁面のいずれか一方に連なって形成され、前記キャビティの両側方を閉塞して該キャビティを区画する内側面と、前記キャビティに摺動自在に挿入され、該キャビティに供給された原料粉末を圧縮するパンチとを備えることを特徴とする。 The flat part molding die apparatus of the present invention has a flat inner wall surface and a die formed with a die hole penetrating in the vertical direction, and is inserted into the die hole of the die, and is inserted. A core member having an outer wall surface facing the inner wall surface and forming a cavity corresponding to the thickness of the flat plate component between the inner wall surface and the inner wall surface of the mold hole or the core member; An inner surface that is formed continuously to one of the outer wall surfaces, closes both sides of the cavity to partition the cavity, and a raw material powder that is slidably inserted into the cavity and supplied to the cavity. And a punch for compression.

本発明では、平板状部品の圧粉体は、一方の平坦面が型孔の内壁面によって形成され、他方の平坦面がコア部材の外壁面で形成され、両側の側面は、型孔の内壁面またはコア部材の外壁面のいずれか一方に連なって形成された内側面によって形成される。原料粉末が充填されるキャビティの両側の側部の内隅部は、内側面と型孔の内壁面とで形成されるものと、内側面とコア部材の外壁面とで形成されるものの２つがあるが、これらのうち、内側面に連なっていない側の壁面（型孔の内壁面またはコア部材の外壁面）と内側面とで形成される内隅部においては、内側面に連なっていない側の壁面と内側面との接合境界面が内隅部の外方に延びている。このため、パンチで原料粉末を圧縮成形した際に当該内隅部に応力がかかると、その応力は上記接合境界面にリークし、この内隅部への応力集中が起こらない。その結果、この内隅部を起点としたクラック発生が防がれる。 In the present invention, the green compact of the flat part has one flat surface formed by the inner wall surface of the mold hole, the other flat surface formed by the outer wall surface of the core member, and the side surfaces on both sides are the inner surfaces of the mold hole. It is formed by an inner surface formed continuously with either the wall surface or the outer wall surface of the core member. There are two inner corners on both sides of the cavity filled with the raw material powder, one formed by the inner surface and the inner wall surface of the mold cavity, and the other formed by the inner surface and the outer wall surface of the core member. Of these, the inner corner formed by the inner wall surface (the inner wall surface of the mold cavity or the outer wall surface of the core member) and the inner surface that is not connected to the inner surface is the side that is not connected to the inner surface. The joint boundary surface between the inner wall surface and the inner side surface extends outward from the inner corner. For this reason, when a stress is applied to the inner corner when the raw material powder is compression-molded with a punch, the stress leaks to the joint boundary surface, and stress concentration does not occur in the inner corner. As a result, the occurrence of cracks starting from the inner corner is prevented.

一方、内側面に連なっている側の壁面と内側面とで形成される内隅部には、従来のように応力が集中しやすい。そこで本発明では、前記内側面と、この内側面に連なる前記型孔の前記内壁面または前記コア部材の前記外壁面とで形成される内隅部が、Ｒ状に形成され、応力が集中しにくい構造とすることを形態を好ましいものとする。 On the other hand, stress tends to concentrate on the inner corner formed by the wall surface and the inner side surface that are continuous with the inner side surface as in the prior art. Therefore, in the present invention, an inner corner portion formed by the inner side surface and the inner wall surface of the mold hole connected to the inner side surface or the outer wall surface of the core member is formed in an R shape, and stress is concentrated. It is preferable that the structure be difficult.

また、本発明は、前記キャビティは、前記型孔の上側に開口し、下側が前記ダイスまたは前記コア部材に形成された段部によって閉塞され、キャビティの上側の開口から前記パンチが該キャビティ内に挿入される形態を含む。この形態によれば、パンチは１つで構成することができ、キャビティ内の原料粉末は、そのパンチと段部との間に挟まれて上下方向に圧縮成形される。 Further, according to the present invention, the cavity opens above the mold hole, and the lower side is closed by a step portion formed on the die or the core member, and the punch enters the cavity from the upper opening of the cavity. Includes the form to be inserted. According to this embodiment, a single punch can be configured, and the raw material powder in the cavity is sandwiched between the punch and the stepped portion and compressed in the vertical direction.

ダイスまたはコア部材に上記段部を有する場合には、段部の内隅部をＲ状に形成することにより、この段部の内隅部への応力集中が抑えられるため、好ましい形態とされる。 When the die or the core member has the stepped portion, the inner corner of the stepped portion is formed in an R shape, so that stress concentration on the inner corner of the stepped portion can be suppressed. .

また、ダイスまたはコア部材に上記段部を有する場合には、その段部が形成されたダイスまたはコア部材は、該段部を境界として、前記外壁面を含む本体側と、該段部を含む段部側とに、上下方向に分割される形態を含む。この形態によれば、段部の内隅部が本体側と段部側との２部材で構成され、その内隅部の外方に本体側と段部側との接合境界面が延びている。このため、段部の内隅部への応力集中は起こらず、この内隅部を起点としたクラック発生が防がれる。 Further, when the die or core member has the stepped portion, the die or core member formed with the stepped portion includes the stepped portion as a boundary and the main body side including the outer wall surface, and the stepped portion. The step part side includes a form that is divided in the vertical direction. According to this aspect, the inner corner portion of the step portion is composed of two members of the main body side and the step portion side, and the joint boundary surface between the main body side and the step portion side extends outward from the inner corner portion. . For this reason, stress concentration at the inner corner of the step portion does not occur, and cracks starting from the inner corner are prevented.

次に、本発明の平板状部品の圧粉体成形金型装置は、平坦な内壁面を有し、上下方向に貫通する型孔が形成されたダイスと、このダイスの前記型孔に挿入され、挿入状態で、前記内壁面に対向し、該内壁面との間に前記平板状部品の厚さに対応したキャビティを形成する外壁面を有するコア部材と、前記型孔内の、前記ダイスと前記コア部材との間に摺動自在に挿入され、前記キャビティの両側方を閉塞して該キャビティを区画する内側面を有する側面形成部材と、前記キャビティに摺動自在に挿入され、該キャビティに供給された原料粉末を圧縮するパンチとを備えることを特徴とする。 Next, a compact molding apparatus for a flat part of the present invention includes a die having a flat inner wall surface and having a die hole penetrating in the vertical direction, and is inserted into the die hole of the die. A core member having an outer wall surface facing the inner wall surface in the inserted state and forming a cavity corresponding to the thickness of the plate-like component between the inner wall surface, and the die in the mold cavity, A side surface forming member having an inner side surface that is slidably inserted between the core member and closes both sides of the cavity to partition the cavity, and is slidably inserted into the cavity and is inserted into the cavity. And a punch for compressing the supplied raw material powder.

この発明では、平板状部品の圧粉体は、一方の平坦面が型孔の内壁面によって形成され、他方の平坦面がコア部材の外壁面で形成され、両側の側面は、内側面を有する側面形成部材の内側面によって形成される。原料粉末が充填されるキャビティの両側の側部の２つの内隅部のうちの一方の内隅部は、側面形成部材の内側面と型孔の内壁面とで形成され、他方の内隅部は側面形成部材の内側面とコア部材の該壁面とで形成される。これら内隅部においては、いずれも壁面（型孔の内壁面またはコア部材の外壁面）と側面形成部材とによる接合境界面が内隅部の外方に延びている。すなわち、いずれの内隅部も側面形成部材とダイス、側面形成部材とコア部材といったように２部材で形成され、それら部材の接合境界面が内隅部の外方に延びている。このため、それら内隅部への応力集中が起こらず、この内隅部を起点としたクラック発生が防がれる。 In the present invention, the green compact of the flat part has one flat surface formed by the inner wall surface of the mold cavity, the other flat surface formed by the outer wall surface of the core member, and both side surfaces having inner surfaces. It is formed by the inner surface of the side surface forming member. One inner corner of the two inner corners on both sides of the cavity filled with the raw material powder is formed by the inner side surface of the side surface forming member and the inner wall surface of the mold cavity, and the other inner corner portion Is formed by the inner surface of the side surface forming member and the wall surface of the core member. In each of these inner corners, the joint boundary surface between the wall surface (the inner wall surface of the mold hole or the outer wall surface of the core member) and the side surface forming member extends outward from the inner corner portion. That is, each inner corner is formed of two members such as a side surface forming member and a die, and a side surface forming member and a core member, and a joining boundary surface of these members extends outward from the inner corner. For this reason, stress concentration does not occur in the inner corners, and cracks starting from the inner corners are prevented.

本発明によれば、金型の内隅部を起点としたクラック発生を防ぐことができ、その結果、高圧での圧縮成形を可能として硬さの高い原料粉末を用いた場合であっても適確に成形することができるといった効果を奏する。 According to the present invention, it is possible to prevent the occurrence of cracks starting from the inner corner of the mold, and as a result, it is possible to perform compression molding at a high pressure even when a high hardness raw material powder is used. There is an effect that it can be molded accurately.

本発明の第１実施形態に係る圧粉体成形金型装置によって圧粉体を成形する工程を示す断面図である。It is sectional drawing which shows the process of shape | molding a green compact by the green compact molding die apparatus which concerns on 1st Embodiment of this invention. 第１実施形態に係る金型装置のダイスの平面図である。It is a top view of the die | dye of the metal mold apparatus which concerns on 1st Embodiment. （ａ）図２のＡ−Ａ断面に対応する斜視図、（ｂ）コア部材と下パンチを示す斜視図である。(A) The perspective view corresponding to the AA cross section of FIG. 2, (b) It is a perspective view which shows a core member and a lower punch. 図２のＢ部拡大図である。It is the B section enlarged view of FIG. （ａ）上パンチの横断面図、（ｂ）下パンチの横断面図である。(A) A cross-sectional view of the upper punch, (b) a cross-sectional view of the lower punch. 第１実施形態の金型装置で成形された平板状部品の圧粉体の（ａ）平面図、（ｂ）斜視図である。It is the (a) top view and (b) perspective view of the green compact of the flat component shape | molded with the metal mold apparatus of 1st Embodiment. 本発明の第１実施形態においてコア部材を変更した変更例１の金型装置によって圧粉体を成形する工程を示す断面図である。It is sectional drawing which shows the process of shape | molding a green compact by the metal mold apparatus of the modification 1 which changed the core member in 1st Embodiment of this invention. 同変更例１の金型装置の（ａ）ダイスおよびコア部材の縦断面斜視図、（ｂ）コア部材の斜視図である。It is the longitudinal cross-sectional perspective view of (a) dice | dies and a core member of the metal mold | die apparatus of the example 1 of the change, (b) It is a perspective view of a core member. コア部材の段部の好ましい例を示す断面図である。It is sectional drawing which shows the preferable example of the step part of a core member. 本発明の第１実施形態においてコア部材を変更した変更例２の金型装置の（ａ）ダイスおよびコア部材の縦断面斜視図、（ｂ）コア部材の斜視図である。It is the longitudinal cross-sectional perspective view of (a) dice | dies and the core member of the mold apparatus of the modification 2 which changed the core member in 1st Embodiment of this invention, (b) The perspective view of a core member. 同変更例２のコア部材の下部断面図である。It is a lower part sectional view of the core member of the example 2 of change. 本発明の第２実施形態に係る圧粉体成形金型装置のダイスの平面図である。It is a top view of the die | dye of the compacting die apparatus which concerns on 2nd Embodiment of this invention. （ａ）図１２のＣ−Ｃ断面に対応する斜視図、（ｂ）第２実施形態のコア部材と下パンチを示す斜視図である。(A) The perspective view corresponding to CC section of FIG. 12, (b) It is a perspective view which shows the core member and lower punch of 2nd Embodiment. 図１２のＤ部拡大図である。It is the D section enlarged view of FIG. 本発明の第３実施形態に係る圧粉体成形金型装置のダイスの平面図である。It is a top view of the die | dye of the compacting die apparatus which concerns on 3rd Embodiment of this invention. （ａ）図１５のＥ−Ｅ断面に対応する斜視図、（ｂ）第３実施形態のコア部材と下パンチを示す斜視図である。(A) The perspective view corresponding to the EE cross section of FIG. 15, (b) It is a perspective view which shows the core member and lower punch of 3rd Embodiment. 平板状部品の一例を示す斜視図である。It is a perspective view which shows an example of a flat component. 図１７に示した平板状部品の圧粉体を成形するための従来の金型装置の一例を示す平面図である。It is a top view which shows an example of the conventional metal mold | die apparatus for shape | molding the green compact of the flat component shown in FIG. 図１８のＦ−Ｆ断面に対応する図であって、（ａ）斜視図、（ｂ）原料粉末をパンチで圧縮成形した状態の断面図である。It is a figure corresponding to the FF cross section of FIG. 18, Comprising: (a) Perspective view, (b) It is sectional drawing of the state which compression-molded raw material powder with the punch. 図１８のＧ部拡大図であって、キャビティの内隅部にクラックが生じた状態を示している。It is the G section enlarged view of Drawing 18, and shows the state where the crack occurred in the inner corner of the cavity.

以下、図面を参照して本発明の平板状部品の圧粉体成形金型装置に係る実施形態（第１〜第３実施形態）を説明する。いずれの実施形態も、図１７に示した平板状部品１００と同形状のものを原料粉末から圧粉体に成形するものである。 Hereinafter, embodiments (first to third embodiments) according to a green compact mold apparatus for flat plate parts of the present invention will be described with reference to the drawings. In any of the embodiments, the same shape as the flat plate component 100 shown in FIG. 17 is formed from the raw material powder into the green compact.

（１）第１実施形態
図１は、本発明の第１実施形態に係る金型装置によって圧粉体を成形する工程を示している。金型装置は、ダイス１０と、ダイス１０の型孔１１に挿入された板状のコア部材２０と、ダイス１０とコア部材２０との間に区画される２つのキャビティ５０に摺動自在に挿入される上下一対の板状のパンチ３０，４０とを備えている。 (1) 1st Embodiment FIG. 1: has shown the process of shape | molding a green compact by the metal mold apparatus which concerns on 1st Embodiment of this invention. The mold apparatus is slidably inserted into a die 10, a plate-like core member 20 inserted into a die hole 11 of the die 10, and two cavities 50 defined between the die 10 and the core member 20. A pair of upper and lower plate-shaped punches 30 and 40 are provided.

図２および図３（ａ）に示すように、ダイス１０は上下の端面が水平で、外周面が円筒状とされ、その軸方向が上下方向に沿って設置されており、図１に示すように固定プレート６０を貫通して上下方向に延びるガイドロッド７０の上端に固定されている。ガイドロッド７０は、昇降駆動部８１によって昇降する可動プレート８０上に固定されている。 As shown in FIGS. 2 and 3 (a), the die 10 has a horizontal upper and lower end surface and a cylindrical outer peripheral surface, and its axial direction is set along the vertical direction, as shown in FIG. The guide rod 70 is fixed to the upper end of the guide rod 70 extending vertically through the fixing plate 60. The guide rod 70 is fixed on a movable plate 80 that is lifted and lowered by a lift drive unit 81.

ダイス１０の中心には、上下方向に延びる断面長方形状の型孔１１が貫通形成されている。図２に示すように、型孔１１は、断面において長辺側の内壁面１１ａと、短辺側の内側面１１ｂとに囲まれて形成されている。型孔１１の断面の長辺側の長さは、得るべき平板状部品１００の幅と同じ寸法を有している。また、短辺側の長さは、平板状部品１００の厚さよりも大きい寸法であって、平板状部品１００の厚さの例えば４倍程度の寸法を有している。 A die hole 11 having a rectangular cross section extending in the vertical direction is formed through the center of the die 10. As shown in FIG. 2, the mold cavity 11 is formed so as to be surrounded by an inner wall surface 11 a on the long side and an inner surface 11 b on the short side in the cross section. The length of the long side of the cross section of the mold hole 11 has the same dimension as the width of the flat plate-like component 100 to be obtained. Further, the length on the short side is larger than the thickness of the flat plate component 100 and has a size, for example, about four times the thickness of the flat plate component 100.

図３（ｂ）に示すように、コア部材２０は外壁面２１を有する一定厚さの板状部材であって、図１に示すように固定プレート６０を貫通して可動プレート８０上に固定されている。コア部材２０は、型孔１１内に、両側の側面２２が型孔１１の内側面１１ｂに摺動する状態に上下方向に沿って挿入される。コア部材２０は、型孔１１の中央に位置付けられ、水平な上端面がダイス１０の上端面と同一平面となる長さを有している。可動プレート８０が昇降することにより、ダイス１０とコア部材２０はともに昇降し、位置関係は不動である。 As shown in FIG. 3B, the core member 20 is a plate-like member having an outer wall surface 21 having a constant thickness, and is fixed on the movable plate 80 through the fixed plate 60 as shown in FIG. ing. The core member 20 is inserted into the mold hole 11 along the vertical direction so that the side surfaces 22 on both sides slide on the inner surface 11b of the mold hole 11. The core member 20 is positioned at the center of the mold hole 11 and has a length such that the horizontal upper end surface is flush with the upper end surface of the die 10. As the movable plate 80 moves up and down, both the die 10 and the core member 20 move up and down, and the positional relationship does not move.

図２に示すように、コア部材２０が挿入された型孔１１の、コア部材２０の厚さ方向の両側には、平板状部品１００と同じ厚さおよび幅の寸法を有するキャビティ５０がそれぞれ区画される。これらキャビティ５０は、互いに平行に対向する型孔１１の内壁面１１ａとコア部材２０の外壁面２１と、型孔１１の内壁面１１ａに連なって形成されキャビティ５０の両側方を閉塞する内側面１１ｂとにより、断面形状が平板状部品１００と略同じ断面形状に形成されている。 As shown in FIG. 2, cavities 50 having the same thickness and width as the plate-like component 100 are defined on both sides of the mold hole 11 in which the core member 20 is inserted in the thickness direction of the core member 20. Is done. The cavities 50 are formed to be connected to the inner wall surface 11 a of the mold hole 11, the outer wall surface 21 of the core member 20, and the inner wall surface 11 a of the mold hole 11, which are parallel to each other. As a result, the cross-sectional shape is formed to be substantially the same cross-sectional shape as the flat plate-like component 100.

型孔１１内の２つのキャビティ５０には、上側の開口から上パンチ３０が摺動自在に挿入され、下側の開口から下パンチ４０が摺動自在に挿入される。これらパンチ３０，４０の断面形状は、平板状部品１００と略同じに形成されている。上下のパンチ３０，４０は、互いの対向面となる下端面および上端面が水平となっている。 The upper punch 30 is slidably inserted into the two cavities 50 in the mold hole 11 from the upper opening, and the lower punch 40 is slidably inserted from the lower opening. The cross-sectional shapes of these punches 30 and 40 are formed substantially the same as those of the flat plate component 100. The upper and lower punches 30 and 40 have a lower end surface and an upper end surface that are opposed to each other and are horizontal.

図４に示すように、キャビティ５０の、型孔１１の内壁面１１ａから内側面１１ｂに連なる外側（コア部材２０から遠い側）の内隅部５５は、直角を面取り加工したようなＲ状に形成されている。また、キャビティ５０の、コア部材２０の外壁面２１と型孔１１の内側面１１ｂとで形成される内側（コア部材２０に近い側）の内隅部５６は、直角状に形成されている。 As shown in FIG. 4, the inner corner 55 of the cavity 50 on the outer side (the side far from the core member 20) that is continuous from the inner wall surface 11 a to the inner surface 11 b of the mold hole 11 has an R shape that is chamfered at a right angle. Is formed. In addition, the inner corner 56 of the cavity 50 formed by the outer wall surface 21 of the core member 20 and the inner side surface 11b of the mold hole 11 is formed at a right angle.

図５（ｂ）で断面を示す下パンチ４０は、固定プレート６０上に固定され、コア部材２０に対向する内側の面４１が、コア部材２０の外壁面２１に当接し、かつ摺動自在となっている。また、外側の面４２は型孔１１の内壁面１１ａに摺動し、両側の側面４３は型孔１１の内側面１１ｂに摺動する。上パンチ３０は、図示せぬ上パンチ駆動部によって昇降し、下降することにより、キャビティ５０に摺動状態で挿入される。 The lower punch 40 whose cross section is shown in FIG. 5B is fixed on the fixing plate 60, the inner surface 41 facing the core member 20 abuts on the outer wall surface 21 of the core member 20, and is slidable. It has become. Further, the outer surface 42 slides on the inner wall surface 11 a of the mold hole 11, and the side surfaces 43 on both sides slide on the inner surface 11 b of the mold hole 11. The upper punch 30 is inserted into the cavity 50 in a sliding state by being lifted and lowered by an upper punch driving unit (not shown).

一方、図５（ａ）に示すように上パンチ３０は下パンチ４０と断面形状が同じであり、コア部材２０の外壁面２１に摺動する内側の面３１と、型孔１１の内壁面１１ａに摺動する外側の面３２と、内側面１１ｂに摺動する両側の側面３３とを有しており、下降することにより、キャビティ５０に摺動自在に挿入される。 On the other hand, as shown in FIG. 5A, the upper punch 30 has the same cross-sectional shape as the lower punch 40, and the inner surface 31 that slides on the outer wall surface 21 of the core member 20 and the inner wall surface 11 a of the mold hole 11. It has an outer surface 32 that slides on the inner surface 11 and side surfaces 33 on both sides that slide on the inner surface 11b, and is slidably inserted into the cavity 50 by descending.

図５に示すように、上下のパンチ３０，４０の、キャビティ５０の外側の内隅部５５に対応する２つの外隅部３５，４５は、内隅部５５に摺動するＲ状にそれぞれ形成されており、また、キャビティ５０の内隅部５６に対応する２つの外隅部３６，４６は、内隅部５６に摺動する直角状にそれぞれ形成されている。 As shown in FIG. 5, the two outer corner portions 35, 45 corresponding to the inner corner portion 55 outside the cavity 50 of the upper and lower punches 30, 40 are respectively formed in an R shape that slides on the inner corner portion 55. Further, the two outer corner portions 36 and 46 corresponding to the inner corner portion 56 of the cavity 50 are respectively formed in a right angle shape that slides on the inner corner portion 56.

以上が第１実施形態の金型装置の構成であり、次いで、この金型装置により平板状部品１００の圧粉体を成形する手順を説明する。まず、図１（ａ）に示すように、上パンチ３０を上方に退避させ、また、ダイス１０の高さ位置を調整して下パンチ４０がキャビティ５０の下端部に挿入された状態とする。そして下パンチ４０で下方の開口が閉塞された各キャビティ５０内に、上方の開口から原料粉末Ｐをそれぞれ供給し、すり切り状態としてキャビティ５０内に原料粉末Ｐを充満させる。 The above is the configuration of the mold apparatus according to the first embodiment. Next, a procedure for molding the green compact of the flat plate component 100 using this mold apparatus will be described. First, as shown in FIG. 1A, the upper punch 30 is retracted upward, and the height position of the die 10 is adjusted so that the lower punch 40 is inserted into the lower end portion of the cavity 50. Then, the raw material powder P is supplied from the upper opening into each cavity 50 whose lower opening is closed by the lower punch 40, and the raw material powder P is filled in the cavity 50 in a ground state.

次に、図１（ｂ）に示すように、キャビティ５０内に上パンチ３０を挿入するとともにダイス１０を下降させることにより、下パンチ４０を相対的に上昇させ、原料粉末Ｐを上下のパンチ３０，４０で挟み、上下方向に所定圧力で圧縮する。 Next, as shown in FIG. 1 (b), the upper punch 30 is inserted into the cavity 50 and the die 10 is lowered to raise the lower punch 40 relatively, so that the raw material powder P is fed into the upper and lower punches 30. , 40 and compressed at a predetermined pressure in the vertical direction.

これにより、キャビティ５０内の原料粉末Ｐは平板状部品１００に近似する形状の圧粉体１００Ａに成形される。この後は、図１（ｃ）に示すように、上パンチ３０をキャビティ５０から抜いて上方に退避させるとともに、ダイス１０を下降させて下パンチ４０に載っている状態の圧粉体１００Ａをダイス１０から抜き出す。 Thereby, the raw material powder P in the cavity 50 is formed into a green compact 100 </ b> A having a shape approximating that of the flat plate component 100. Thereafter, as shown in FIG. 1C, the upper punch 30 is removed from the cavity 50 and retracted upward, and the die 10 is lowered and the green compact 100A placed on the lower punch 40 is removed from the die. 10 out.

図６は得られた圧粉体１００Ａを示しており、この圧粉体１００Ａは厚さが例えば１〜５ｍｍ程度の矩形状に成形される。圧粉体１００Ａは、一方の平坦面１０１が型孔１１の内壁面１１ａで形成され、他方の平坦面１０２がコア部材２０の外壁面２１で形成され、両側の側面１０３が型孔１１の内側面１１ｂで形成される。また、上下の端面１０７，１０８は、それぞれ上下のパンチ３０，４０で形成される。圧粉体１００Ａの側面１０３から一方の平坦面１０１に連なる外隅部１０５は、キャビティ５０のＲ状の内隅部５５が転写されてＲ状に形成される。また、側面１０３から他方の平坦面１０２に連なる外隅部１０６は、キャビティ５０の直角状の内隅部５６が転写されて直角状に形成される。得られた圧粉体１００Ａは焼結され、焼結体からなる平板状部品１００が製造される。 FIG. 6 shows the obtained green compact 100A, and this green compact 100A is formed into a rectangular shape having a thickness of, for example, about 1 to 5 mm. In the green compact 100 </ b> A, one flat surface 101 is formed by the inner wall surface 11 a of the mold hole 11, the other flat surface 102 is formed by the outer wall surface 21 of the core member 20, and both side surfaces 103 are inside the mold hole 11. It is formed by the side surface 11b. The upper and lower end surfaces 107 and 108 are formed by upper and lower punches 30 and 40, respectively. The outer corner 105 that extends from the side surface 103 of the green compact 100A to the one flat surface 101 is formed in an R shape by transferring the R inner corner 55 of the cavity 50. In addition, the outer corner 106 connected from the side surface 103 to the other flat surface 102 is formed in a right angle by transferring the right inner corner 56 of the cavity 50. The obtained green compact 100A is sintered to produce a flat plate-like component 100 made of a sintered body.

上記第１実施形態の金型装置によれば、成形された圧粉体１００Ａの両端部の直角状に形成された外隅部１０６は、キャビティ５０の直角状の内隅部５６で形成される。この内隅部５６は、型孔１１の内側面１１ｂとコア部材２０の外壁面１１とで形成される直角状の内隅部５６が転写されて直角状に形成される。すなわちこのキャビティ５０の内隅部５６は、分割されるダイス１０とコア部材２０とで直角状に形成され、この内隅部５６からは、図４に示すように、型孔１１の内壁面１１ａとコア部材２０の外壁面２１との接合境界面９１が内隅部５６から外方に延びている。 According to the mold apparatus of the first embodiment, the outer corners 106 formed at right angles at both ends of the molded green compact 100 </ b> A are formed by the right inner corners 56 of the cavity 50. . The inner corner portion 56 is formed in a right angle by transferring a right angle inner corner portion 56 formed by the inner side surface 11b of the mold hole 11 and the outer wall surface 11 of the core member 20. That is, the inner corner 56 of the cavity 50 is formed in a right angle by the divided die 10 and the core member 20, and from the inner corner 56, as shown in FIG. 4, the inner wall surface 11a of the mold hole 11 is formed. A boundary 91 between the inner wall 56 and the outer wall 21 of the core member 20 extends outward from the inner corner 56.

このため、上下のパンチ３０，４０で原料粉末Ｐを圧縮成形した際に内隅部５６に応力がかかると、その応力は、この内側の内隅部５６から上記接合境界面９１にリークし、内隅部５６への応力集中は起こらない。その結果、内隅部５６を起点としたクラック発生が防がれる。一方、キャビティ５０の外側の内隅部５５はコア部材２０のみで形成されているものの、Ｒ状に形成されているため、応力集中が生じにくくなっている。これらのことから、比較的高圧で原料粉末Ｐを圧縮成形することが可能となり、例えば原料粉末Ｐがアモルファス磁性粉等の硬さの高い粉末であっても、高圧で圧縮成形することにより目的形状の圧粉体（この場合、圧粉体１００Ａ）を適確に成形することができる。なお、応力集中を緩和するためには、Ｒ状に形成された内隅部５５の半径を１ｍｍ以上とすることが好ましく、２ｍｍ以上とすることがさらに好ましい。 For this reason, when stress is applied to the inner corner portion 56 when the raw material powder P is compression-molded by the upper and lower punches 30 and 40, the stress leaks from the inner inner corner portion 56 to the joint boundary surface 91, Stress concentration on the inner corner 56 does not occur. As a result, the occurrence of cracks starting from the inner corner 56 is prevented. On the other hand, the inner corner portion 55 outside the cavity 50 is formed only by the core member 20, but is formed in an R shape, so that stress concentration is less likely to occur. From these things, it becomes possible to compression-mold the raw material powder P at a relatively high pressure. For example, even if the raw material powder P is a hard powder such as amorphous magnetic powder, the target shape can be obtained by compression-molding at a high pressure. The green compact (in this case, green compact 100A) can be accurately formed. In order to alleviate the stress concentration, the radius of the inner corner portion 55 formed in an R shape is preferably 1 mm or more, and more preferably 2 mm or more.

次に、キャビティ５０が形成される上記第１実施形態のコア部材２０の構成を変更した変更例１，２について説明する。 Next, modified examples 1 and 2 in which the configuration of the core member 20 of the first embodiment in which the cavity 50 is formed will be described.

（２）第１実施形態の変更例１
図７は、上記実施形態のコア部材２０を変更した変更例１の金型装置によって平板状部品１００の圧粉体１００Ａを成形する工程を示している。 (2) Modification 1 of the first embodiment
FIG. 7 shows a step of forming the green compact 100A of the flat plate component 100 by the mold apparatus of the first modification in which the core member 20 of the above embodiment is changed.

図８に示すように、この場合のコア部材２０は、上記第１実施形態のコア部材２０に下パンチ４０を一体に形成したような構成となっている。すなわちこの場合のコア部材２０は、外壁面２１でキャビティ５０を形成するコア部２１０と、コア部２１０の下側に、元のコア部材２０に下パンチ４０を重ねた厚さを有する下パンチ部２２０とから構成されており、図７に示すように、固定プレート６０上に固定されている。 As shown in FIG. 8, the core member 20 in this case is configured such that the lower punch 40 is integrally formed with the core member 20 of the first embodiment. That is, the core member 20 in this case includes a core portion 210 that forms the cavity 50 on the outer wall surface 21, and a lower punch portion that has a thickness in which the lower punch 40 is stacked on the original core member 20 below the core portion 210. 220, and is fixed on a fixed plate 60 as shown in FIG.

コア部２１０から下パンチ部２２０に移行する下パンチ部２２０の上端部分は水平な段部２２１となっており、キャビティ５０は型孔１１の上側に開口し、下側が段部２２１によって閉塞された状態となっている。図７に示すように、コア部２１０は、段部２２１がキャビティ５０内に挿入された状態で、上端面がダイスの上端面よりも下側に位置する長さに設定されている。下パンチ部２２０の四隅の各外隅部４３は、キャビティ５０の外側の内隅部５５に摺動するＲ状に形成されている。 The upper end portion of the lower punch portion 220 that transitions from the core portion 210 to the lower punch portion 220 is a horizontal step portion 221, the cavity 50 is opened above the mold hole 11, and the lower side is closed by the step portion 221. It is in a state. As shown in FIG. 7, the core portion 210 is set to a length such that the upper end surface is positioned below the upper end surface of the die in a state where the step portion 221 is inserted into the cavity 50. The outer corners 43 at the four corners of the lower punch 220 are formed in an R shape that slides on the inner corner 55 outside the cavity 50.

この金型装置によって圧粉体を成形するには、はじめに図７（ａ）に示すようにコア部材２０の高さ位置を、段部２２１がキャビティ５０の下端部に挿入された状態とし、次いで各キャビティ５０内、およびキャビティ５０の上方の型孔１１の上部に原料粉末Ｐを供給し、すり切り状態とする。 In order to mold the green compact with this mold apparatus, first, as shown in FIG. 7A, the height of the core member 20 is set to the state where the step portion 221 is inserted into the lower end portion of the cavity 50, and then The raw material powder P is supplied into each cavity 50 and the upper part of the mold hole 11 above the cavity 50 to be in a ground state.

次に、図７（ｂ）に示すように、キャビティ５０内に上パンチ３０を挿入するとともにダイス１０を下降させることにより、コア部材２０を相対的に上昇させ、原料粉末Ｐを上パンチ３０と下パンチ部２２０の段部２２１で挟み、上下方向に所定圧力で圧縮する。この後、図７（ｃ）に示すように上パンチ３０をキャビティ５０から抜いて上方に退避させるとともに、ダイス１０を下降させ、圧粉体１００Ａを抜き出す。 Next, as shown in FIG. 7B, the core member 20 is relatively raised by inserting the upper punch 30 into the cavity 50 and lowering the die 10, so that the raw material powder P is mixed with the upper punch 30. It is sandwiched between the step portions 221 of the lower punch portion 220 and compressed with a predetermined pressure in the vertical direction. Thereafter, as shown in FIG. 7C, the upper punch 30 is removed from the cavity 50 and retracted upward, and the die 10 is lowered to extract the green compact 100A.

この変更例１によれば、下パンチ４０が不要であるためパンチは上パンチ３０の１つで構成することができ、したがって上記第１実施形態よりも構成が簡素となるといった利点がある。この場合、図９に示すように、段部２２１の内隅部２２１ａをＲ状に形成しておくと、この内隅部２２１ａへの応力集中が生じにくくなり、内隅部２２１ａを起点としたクラック発生が防がれるので好ましい。 According to the first modification, since the lower punch 40 is unnecessary, the punch can be configured by one of the upper punches 30. Therefore, there is an advantage that the configuration is simpler than the first embodiment. In this case, as shown in FIG. 9, if the inner corner 221a of the step 221 is formed in an R shape, stress concentration on the inner corner 221a is less likely to occur, and the inner corner 221a is the starting point. Since crack generation is prevented, it is preferable.

（３）第１実施形態の変更例２
図１０は、変更例２のコア部材２０を示している。このコア部材２０は、上記変更例１のコア部材２０において、段部２２１を境界として、外壁面２１を含むコア部（本体側）２１０と、段部２２１を含む下パンチ部２２０（段部側）とに、上下方向に分割される構成となっている。図１１に示すように、下パンチ部２２０の上端面の中心には細長い矩形状の突起２２２が形成されており、コア部２１０の下端面には突起２２２が嵌合する凹部２１２が形成されている。 (3) Modification 2 of the first embodiment
FIG. 10 shows the core member 20 of the second modification. The core member 20 includes a core portion (main body side) 210 including an outer wall surface 21 and a lower punch portion 220 (step portion side) including a step portion 221 with the step portion 221 as a boundary in the core member 20 of the first modification. ) And is divided in the vertical direction. As shown in FIG. 11, an elongated rectangular protrusion 222 is formed at the center of the upper end surface of the lower punch portion 220, and a concave portion 212 into which the protrusion 222 is fitted is formed at the lower end surface of the core portion 210. Yes.

このコア部材２０は、コア部２１０の凹部２１２に下パンチ部２２０の突起２２２を嵌合して組み立てられる。凹部２１２および突起２２２は組み立てる際の位置決め手段であり、凹部２１２に突起２２２が嵌合することにより、コア部２１０はダイス１０の型孔１１内の中央に挿入されて一対のキャビティ５０が形成される。この組み立て状態でコア部材２０は上記変更例１のコア部材２０と同一形状となり、図１１に示すように、下パンチ部２２０の露出する上端面が段部２２１を構成する。 The core member 20 is assembled by fitting the protrusion 222 of the lower punch portion 220 into the recess 212 of the core portion 210. The concave portion 212 and the protrusion 222 are positioning means for assembling. When the protrusion 222 is fitted into the concave portion 212, the core portion 210 is inserted into the center of the die hole 11 of the die 10 to form a pair of cavities 50. The In this assembled state, the core member 20 has the same shape as the core member 20 of the first modification, and the upper end surface of the lower punch portion 220 exposed constitutes a step portion 221 as shown in FIG.

この変更例２では、コア部材２０をコア部２１０と下パンチ部２２０とに分割する構成としたことにより、図１１に示すように段部２２１とコア部２１０の外壁面２１とで形成されるキャビティ５０の内隅部２２１ａは直角状となり、この内隅部２２１ａからは、コア部２１０の下端面と下パンチ部２２０の上端面との接合境界面９２が水平に延びている。したがって内隅部２２１ａへの応力集中は起こらず、その結果、内隅部２２１ａを起点としたクラック発生が防がれる。 In the second modification, the core member 20 is divided into the core part 210 and the lower punch part 220, so that the core member 20 is formed by the step part 221 and the outer wall surface 21 of the core part 210 as shown in FIG. The inner corner portion 221a of the cavity 50 has a right angle, and a joining boundary surface 92 between the lower end surface of the core portion 210 and the upper end surface of the lower punch portion 220 extends horizontally from the inner corner portion 221a. Therefore, stress concentration on the inner corner 221a does not occur, and as a result, generation of cracks starting from the inner corner 221a is prevented.

（４）第２実施形態
次に、図１２〜図１４を参照して本発明の第２実施形態に係る金型装置を説明する。
第２実施形態の金型装置は、上記第１実施形態と同様に、ダイス１０、コア部材２０および上下のパンチ３０，４０を備えているが、図６に示した圧粉体１００ＡのＲ状の外隅部１０５を、コア部材２０側に形成したＲ状の内隅部で形成する点で第１実施形態とは異なっている。 (4) Second Embodiment Next, a mold apparatus according to a second embodiment of the present invention will be described with reference to FIGS.
The mold apparatus according to the second embodiment includes a die 10, a core member 20, and upper and lower punches 30 and 40, as in the first embodiment, but the R shape of the green compact 100A shown in FIG. This is different from the first embodiment in that the outer corner portion 105 is formed by an R-shaped inner corner portion formed on the core member 20 side.

図１２および図１３に示すように、コア部材２０は横断面がＩ型状に形成された板状部材で、型孔１１の内壁面１１ａに対向する双方の外壁面２１には溝状の凹部２１３が形成されており、凹部２１３の両側にはダイス１０の内壁面１１ａ側に突出する凸条部２１４が形成されている。コア部材２０の凹部２１３は、両側の凸条部２１４の内側面２１４ａと外壁面２１とにより形成され、図１４に示すように、内側面２１４ａと外壁面２１とで形成される凹部２１３の内隅部２１５は、Ｒ状に形成されている。 As shown in FIGS. 12 and 13, the core member 20 is a plate-like member whose cross section is formed in an I shape, and groove-like recesses are formed on both outer wall surfaces 21 facing the inner wall surface 11 a of the mold hole 11. 213 is formed, and on both sides of the concave portion 213, convex strips 214 projecting toward the inner wall surface 11a side of the die 10 are formed. The concave portion 213 of the core member 20 is formed by the inner side surface 214a and the outer wall surface 21 of the ridges 214 on both sides, and the inner side of the concave portion 213 formed by the inner side surface 214a and the outer wall surface 21 as shown in FIG. The corner 215 is formed in an R shape.

コア部材２０は、両側の外側面２１６が型孔１１の内側面１１ｂに摺動し、かつ、凸条部２１４の先端面が型孔１１の内壁面１１ａに摺動して、型孔１１に挿入される。コア部材２０は、第１実施形態と同様に可動プレート８０上に固定されてダイス１０と一体に昇降し、上端面がダイス１０の上面と同一平面となる長さを有している。 In the core member 20, the outer side surfaces 216 on both sides slide on the inner side surface 11 b of the mold hole 11, and the tip end surface of the protruding portion 214 slides on the inner wall surface 11 a of the mold hole 11. Inserted. Similarly to the first embodiment, the core member 20 is fixed on the movable plate 80 and moves up and down integrally with the die 10, and has a length such that the upper end surface is flush with the upper surface of the die 10.

コア部材２０が挿入された型孔１１内には、コア部材２０の両側にキャビティ５０が形成される。キャビティ５０は、コア部材２０の凹部２１３が型孔１１の内壁面１１ａに閉塞されて形成される。キャビティ５０の側方は、コア部材２０の外壁面２１に連なる凸条部２１４の内側面２１４ａで閉塞された状態となる。キャビティ５０の内側（コア部材２０側）の内隅部は、すなわち凹部２１３の内隅部２１５であって上記のようにＲ状に形成されている。また、凸状部２１４の内側面２１４ａと型孔１１の内壁面１１ａとによって形成されるキャビティ５０の外側の内隅部５７は、直角状に形成される。 Cavities 50 are formed on both sides of the core member 20 in the mold cavity 11 in which the core member 20 is inserted. The cavity 50 is formed by closing the recess 213 of the core member 20 with the inner wall surface 11 a of the mold hole 11. The side of the cavity 50 is in a state of being closed by the inner side surface 214 a of the protruding portion 214 that is continuous with the outer wall surface 21 of the core member 20. The inner corner of the cavity 50 (on the core member 20 side), that is, the inner corner 215 of the recess 213 is formed in an R shape as described above. Further, the inner corner 57 on the outer side of the cavity 50 formed by the inner surface 214a of the convex portion 214 and the inner wall surface 11a of the mold hole 11 is formed in a right angle.

キャビティ５０には上下のパンチ３０，４０が摺動自在に挿入されるが、ここでは、第１実施形態と同じ上下のパンチ３０，４０が、鉛直方向の軸線を中心に１８０°反転され、Ｒ状の外隅部３５，４５が内側（コア部材２０側）に配置された状態でキャビティ５０にそれぞれ挿入される。それら外隅部３５，４５は、凹部２１３すなわちキャビティ５０の内隅部２１５に摺動する。 The upper and lower punches 30 and 40 are slidably inserted into the cavity 50. Here, the upper and lower punches 30 and 40, which are the same as those in the first embodiment, are inverted 180 ° around the vertical axis, and R Are inserted into the cavity 50 in a state where the outer corner portions 35 and 45 are arranged on the inner side (core member 20 side). These outer corner portions 35 and 45 slide into the recess 213, that is, the inner corner portion 215 of the cavity 50.

第２実施形態の金型装置による圧粉体の成形手順は、第１実施形態と同様であり、下パンチ４０が下端部に挿入されたキャビティ５０への原料粉末Ｐの供給、キャビティ５０への上パンチ３０の挿入とともにダイス１０を下降させることで上下のパンチ３０，４０による原料粉末Ｐの圧縮といった工程を経て、図６に示す圧粉体１００Ａが成形される。 The green compact molding procedure by the mold apparatus of the second embodiment is the same as that of the first embodiment. The raw powder P is supplied to the cavity 50 in which the lower punch 40 is inserted at the lower end, and the cavity 50 is supplied. The green compact 100A shown in FIG. 6 is formed through a process such as compression of the raw material powder P by the upper and lower punches 30 and 40 by lowering the die 10 as the upper punch 30 is inserted.

上記第２実施形態の金型装置によれば、キャビティ５０の外側の内隅部５７は、ダイス１０の内壁面１１ａとコア部材２０の凹部２１３の内側面２１４ａとで直角状に形成されており、この内隅部５７からは、図１４に示すように、コア部材２０の凸条部２１４の先端面と内壁面１１ａとの接合境界面９３が内隅部の外方に延びている。 According to the mold apparatus of the second embodiment, the inner corner 57 on the outside of the cavity 50 is formed at a right angle between the inner wall surface 11 a of the die 10 and the inner surface 214 a of the recess 213 of the core member 20. As shown in FIG. 14, a joining boundary surface 93 between the distal end surface of the convex portion 214 of the core member 20 and the inner wall surface 11 a extends outward from the inner corner portion 57 from the inner corner portion 57.

このため、上下のパンチ３０，４０で原料粉末Ｐを圧縮成形した際にキャビティ５０の外側の内隅部５７に応力がかかると、その応力は、この内隅部５７から上記接合境界面９３にリークし、内隅部５７への応力集中は起こらない。その結果、内隅部５７を起点としたクラック発生が防がれる。一方、キャビティ５０の内側の内隅部２１５はコア部材２０のみで形成されるものの、Ｒ状に形成されているため、応力集中が生じにくくなっている。これらのことから、第１実施形態と同様に、原料粉末Ｐがアモルファス磁性粉等の硬さの高い粉末であっても、高圧で圧縮して目的形状の圧粉体を適確に成形することができるといった効果が奏される。 For this reason, when the raw powder P is compression-molded by the upper and lower punches 30 and 40 and stress is applied to the inner corner portion 57 outside the cavity 50, the stress is applied from the inner corner portion 57 to the joint boundary surface 93. Leakage does not occur and stress concentration on the inner corner 57 does not occur. As a result, the occurrence of cracks starting from the inner corner 57 is prevented. On the other hand, the inner corner 215 inside the cavity 50 is formed only by the core member 20 but is formed in an R shape, so that stress concentration is less likely to occur. For these reasons, as in the first embodiment, even if the raw material powder P is a high-hardness powder such as amorphous magnetic powder, the green compact of the desired shape can be accurately formed by compressing at high pressure. The effect that it is possible is produced.

なお、上記第２実施形態においても、第１実施形態の変更例１，２を適用することができる。すなわち、変更例１を適用する場合には、コア部材２０の凹部２１３に下パンチ４０を嵌合して一体化したような形状として凹部２１３を埋めて下パンチ部を形成し、この下パンチ部の上端面を段部とする。原料粉末Ｐは、この段部と上パンチ３０とで挟まれ、上下方向に圧縮される。また、変更例２を適用する場合には、その段部を含む下パンチ部（段部側）と、外壁面に凹部２１３が形成されたコア部（本体側）とに分割する構成とすることにより、実施することができる。 In the second embodiment, the first and second modifications of the first embodiment can be applied. In other words, when the first modification is applied, the lower punch 40 is formed by filling the recess 213 in a shape that fits and integrates the lower punch 40 into the recess 213 of the core member 20. Let the upper end surface of step be a step. The raw material powder P is sandwiched between the stepped portion and the upper punch 30 and compressed in the vertical direction. Moreover, when applying the modified example 2, it is set as the structure divided | segmented into the lower punch part (step part side) including the step part, and the core part (body side) in which the recessed part 213 was formed in the outer wall surface. Can be implemented.

（５）第３実施形態
次に、図１５および図１６を参照して本発明の第３実施形態に係る金型装置を説明する。第３実施形態の金型装置は、上記第２実施形態のコア部材２０において、凸条部２１４を含む幅方向の両端部が分割された構成となっており、コア部材２０は分割された両端部を除く外壁面２１を有する平板状のものとなっている。そして分割された両端部が断面矩形状の側面形成部材２３０とされ、コア部材２０と型孔１１の内側面１１ｂとの間に摺動自在に挿入される。 (5) Third Embodiment Next, a mold apparatus according to a third embodiment of the present invention will be described with reference to FIGS. 15 and 16. The mold apparatus according to the third embodiment has a configuration in which both end portions in the width direction including the ridges 214 are divided in the core member 20 of the second embodiment, and the core member 20 is divided at both ends. It has a flat plate shape having an outer wall surface 21 excluding the portion. The divided end portions are side surface forming members 230 having a rectangular cross section, and are slidably inserted between the core member 20 and the inner side surface 11b of the mold hole 11.

図１５に示すように、コア部材２０と２つの側面形成部材２３０が挿入されたダイス１０の型孔１１内には、コア部材２０の両側にキャビティ５０が形成される。キャビティ５０は、互いに平行に対向する型孔１１の内壁面１１ａとコア部材２０の外壁面２１、および側方を閉塞する側面形成部材２３０の内側面２３１により区画される。このキャビティ５０の内側および外側の内隅部５８，５９は、ともに直角状に形成される。キャビティ５０には上下のパンチ３０，４０が摺動自在に挿入されるが、これら上下のパンチ３０，４０の四隅の外隅部は、キャビティ５０の内隅部５８，５９に摺動する直角状に形成されている。 As shown in FIG. 15, cavities 50 are formed on both sides of the core member 20 in the mold hole 11 of the die 10 into which the core member 20 and the two side surface forming members 230 are inserted. The cavity 50 is defined by the inner wall surface 11a of the mold cavity 11 and the outer wall surface 21 of the core member 20 that face each other in parallel with each other, and the inner surface 231 of the side surface forming member 230 that closes the side. The inner corners 58 and 59 on the inner side and the outer side of the cavity 50 are both formed in a right angle. The upper and lower punches 30 and 40 are slidably inserted into the cavity 50, and the outer corners of the four corners of the upper and lower punches 30 and 40 are perpendicular to the inner corners 58 and 59 of the cavity 50. Is formed.

第３実施形態の金型装置による圧粉体の成形手順は、第１および第２実施形態と同様であり、下パンチ４０が下端部に挿入されたキャビティ５０への原料粉末Ｐの供給、キャビティ５０への上パンチ３０の挿入とともにダイス１０を下降させることで上下のパンチ３０，４０による原料粉末Ｐの圧縮といった工程を経て、平板状部品１００の圧粉体が成形される。 The procedure for forming the green compact by the mold apparatus of the third embodiment is the same as that of the first and second embodiments. The supply of the raw material powder P to the cavity 50 in which the lower punch 40 is inserted in the lower end, the cavity The green compact of the flat plate-like component 100 is formed through a process such as compression of the raw material powder P by the upper and lower punches 30 and 40 by lowering the die 10 together with the insertion of the upper punch 30 into 50.

この場合、圧粉体の側面は側面形成部材２３０の内側面２３１により形成される。また、圧粉体の圧縮方向に直交する断面における四隅は、それぞれキャビティ５０の直角状の内隅部５８，５９が転写されて直角状に形成される。この第３実施形態の金型装置による圧粉体は、四隅のすべてが直角状となり、Ｒ状の隅部を有さないものとなる。 In this case, the side surface of the green compact is formed by the inner side surface 231 of the side surface forming member 230. Further, the four corners in the cross section perpendicular to the compression direction of the green compact are formed in a right angle by transferring the right inner corners 58 and 59 of the cavity 50, respectively. In the green compact by the mold apparatus of the third embodiment, all four corners are right-angled and do not have R-shaped corners.

上記第３実施形態の金型装置によれば、キャビティ５０の内隅部５８，５９のうち、内側の内隅部５８は、コア部材２０の外壁面２１と側面形成部材２３０の内側面２３１とで形成され、この内隅部５８からは、コア部材２０の外側面２１７と内側面２３１との接合境界面９４が外方に延びている。一方、外側の内隅部５９は、型孔１１の内壁面１１ａと側面形成部材２３０の内側面２３１とで形成され、この内隅部５９からは、内壁面１１ａと側面形成部材２３０の側面２３２との接合境界面９５が内隅部から外方に延びている。 According to the mold apparatus of the third embodiment, of the inner corner portions 58 and 59 of the cavity 50, the inner inner corner portion 58 includes the outer wall surface 21 of the core member 20 and the inner surface 231 of the side surface forming member 230. From this inner corner portion 58, a joint boundary surface 94 between the outer surface 217 and the inner surface 231 of the core member 20 extends outward. On the other hand, the outer inner corner portion 59 is formed by the inner wall surface 11 a of the mold hole 11 and the inner surface 231 of the side surface forming member 230, and from the inner corner portion 59, the inner wall surface 11 a and the side surface 232 of the side surface forming member 230 are formed. The interface 95 extends outward from the inner corner.

このため、上下のパンチ３０，４０で原料粉末Ｐを圧縮成形した際に各内隅部５８，５９に応力がかかると、その応力は、内側の内隅部５８においては上記接合境界面９４にリークし、外側の内隅部５９においては上記接合境界面９５にリークする。したがって、これら内隅部５８，５９への応力集中は起こらず、内隅部５８，５９を起点としたクラック発生が防がれる。その結果、第１および第２実施形態と同様に、原料粉末Ｐがアモルファス磁性粉等の硬さの高い粉末であっても、高圧で圧縮して目的形状の圧粉体を適確に成形することができるといった効果が奏される。 For this reason, when stress is applied to the inner corners 58 and 59 when the raw material powder P is compression-molded by the upper and lower punches 30 and 40, the stress is applied to the joint boundary surface 94 at the inner inner corner 58. Leakage occurs, and the outer inner corner portion 59 leaks to the joint boundary surface 95. Therefore, stress concentration on the inner corners 58 and 59 does not occur, and cracks starting from the inner corners 58 and 59 are prevented. As a result, as in the first and second embodiments, even if the raw material powder P is a high-hardness powder such as amorphous magnetic powder, it is compressed at a high pressure to accurately form a green compact of a desired shape. The effect that it can be performed is produced.

なお、上記各実施形態では、型孔１１の内壁面１１ａとコア部材２０の外壁面２１とが平行に対向することにより、得られる平板状部品の圧粉体は厚さが均一となっているが、本発明の平板状部品１００は厚さが均一であることには限定されず、例えば一方の側端部から他方の側端部に向かって厚さがしだいに薄くなるといったように、厚さが均一ではない平板状部品の圧粉体を製造する場合も含む。 In each of the embodiments described above, the inner wall surface 11a of the mold cavity 11 and the outer wall surface 21 of the core member 20 face each other in parallel, so that the green compact of the flat plate component obtained has a uniform thickness. However, the flat plate-like component 100 of the present invention is not limited to a uniform thickness. For example, the thickness gradually decreases from one side end to the other side end. This also includes the case of producing a green compact of a flat part that is not uniform.

１０…ダイス
１１…型孔
１１ａ…型孔の内壁面
１１ｂ，２３１…内側面
２０…コア部材
２１…コア部材の外壁面
３０…上パンチ
４０…下パンチ
５０…キャビティ
５５，２１５，２２１ａ…Ｒ状の内隅部
５６，５７，５８，５９…直角状の内隅部
９１〜９５…接合境界面
１００…平板状部品
１００Ａ…圧粉体
２１０…コア部（本体側）
２２０…下パンチ部（段部側）
２２１…段部
２３０…側面形成部材
Ｐ…原料粉末 DESCRIPTION OF SYMBOLS 10 ... Die 11 ... Mold hole 11a ... Inner wall surface 11b, 231 ... Inner side surface 20 ... Core member 21 ... Outer wall surface of core member 30 ... Upper punch 40 ... Lower punch 50 ... Cavity 55,215,221a ... R shape Inner corners 56, 57, 58, 59 ... Right-angled inner corners 91-95 ... Joining interface 100 ... Flat plate part 100A ... Green compact 210 ... Core part (main body side)
220 ... Lower punch part (step part side)
221 ... Stepped part 230 ... Side surface forming member P ... Raw material powder

Claims

平板状部品の圧粉体を成形する金型装置であって、
平坦な内壁面を有し、上下方向に貫通する型孔が形成されたダイスと、
このダイスの前記型孔に挿入され、挿入状態で、前記内壁面に対向し、該内壁面との間に前記平板状部品の厚さに対応したキャビティを形成する外壁面を有するコア部材と、
前記型孔の前記内壁面または前記コア部材の前記外壁面のいずれか一方に連なって形成され、前記キャビティの両側方を閉塞して該キャビティを区画する内側面と、
前記キャビティに摺動自在に挿入され、該キャビティに供給された原料粉末を圧縮するパンチと、
を備えることを特徴とする平板状部品の圧粉体成形金型装置。 A mold apparatus for molding a green compact of a flat part,
A die having a flat inner wall surface and having a mold hole penetrating in the vertical direction;
A core member that is inserted into the die hole of the die and has an outer wall surface that faces the inner wall surface in an inserted state and forms a cavity corresponding to the thickness of the plate-like component between the inner wall surface;
An inner side surface that is formed to be connected to either the inner wall surface of the mold cavity or the outer wall surface of the core member, closes both sides of the cavity, and defines the cavity;
A punch that is slidably inserted into the cavity and compresses the raw material powder supplied to the cavity;
A compact molding apparatus for a flat part, comprising:

前記内側面と、この内側面に連なる前記型孔の前記内壁面または前記コア部材の前記外壁面とで形成される内隅部が、Ｒ状に形成されていることを特徴とする請求項１に記載の平板状部品の圧粉体成形金型装置。 2. An inner corner formed by the inner side surface and the inner wall surface of the mold cavity connected to the inner side surface or the outer wall surface of the core member is formed in an R shape. 2. A compact molding apparatus for a flat part as described in 1.

前記キャビティは、前記型孔の上側に開口し、下側が前記ダイスまたは前記コア部材に形成された段部によって閉塞され、キャビティの上側の開口から前記パンチが該キャビティ内に挿入されることを特徴とする請求項１または２に記載の平板状部品の圧粉体成形金型装置。 The cavity opens above the mold hole, the lower side is closed by a step formed on the die or the core member, and the punch is inserted into the cavity from the upper opening of the cavity. The green compact mold apparatus for flat plate parts according to claim 1 or 2.

前記段部の内隅部が、Ｒ状に形成されていることを特徴とする請求項３に記載の平板状部品の圧粉体成形金型装置。 4. The green compact mold apparatus for a flat part according to claim 3, wherein an inner corner of the step is formed in an R shape.

前記段部が形成された前記ダイスまたは前記コア部材は、該段部を境界として、前記外壁面を含む本体側と、該段部を含む段部側とに、上下方向に分割されることを特徴とする請求項３に記載の平板状部品の圧粉体成形金型装置。 The die or the core member in which the step portion is formed is divided in the vertical direction into the main body side including the outer wall surface and the step portion side including the step portion with the step portion as a boundary. 4. A compact molding apparatus for a flat part according to claim 3.

平板状部品の圧粉体を成形する金型装置であって、
平坦な内壁面を有し、上下方向に貫通する型孔が形成されたダイスと、
このダイスの前記型孔に挿入され、挿入状態で、前記内壁面に対向し、該内壁面との間に前記平板状部品の厚さに対応したキャビティを形成する外壁面を有するコア部材と、
前記型孔内の、前記ダイスと前記コア部材との間に摺動自在に挿入され、前記キャビティの両側方を閉塞して該キャビティを区画する内側面を有する側面形成部材と、
前記キャビティに摺動自在に挿入され、該キャビティに供給された原料粉末を圧縮するパンチと、
を備えることを特徴とする平板状部品の圧粉体成形金型装置。 A mold apparatus for molding a green compact of a flat part,
A die having a flat inner wall surface and having a mold hole penetrating in the vertical direction;
A core member that is inserted into the die hole of the die and has an outer wall surface that faces the inner wall surface in an inserted state and forms a cavity corresponding to the thickness of the plate-like component between the inner wall surface;
A side surface forming member having an inner side surface that is slidably inserted between the die and the core member in the mold cavity, closes both sides of the cavity, and defines the cavity;
A punch that is slidably inserted into the cavity and compresses the raw material powder supplied to the cavity;
A compact molding apparatus for a flat part, comprising: