JP2012170986A - Die for powder molding - Google Patents

Die for powder molding Download PDF

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JP2012170986A
JP2012170986A JP2011035722A JP2011035722A JP2012170986A JP 2012170986 A JP2012170986 A JP 2012170986A JP 2011035722 A JP2011035722 A JP 2011035722A JP 2011035722 A JP2011035722 A JP 2011035722A JP 2012170986 A JP2012170986 A JP 2012170986A
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hole portion
powder
punch
small hole
metal powder
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JP5626894B2 (en
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Hiroaki Terai
寛明 寺井
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Sumitomo Electric Sintered Alloy Ltd
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Sumitomo Electric Sintered Alloy Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a die for powder molding which can prevent the lowering of density of the foot region of a powder molding body.SOLUTION: A die 1 for powder molding which performs pressure forming of a powder molding body W having a foot region W2, includes a die 2 having a large hole portion 2a into which metal powder is filled up, an upper punch 3 arranged in the upper side of the large hole portion 2a so as to be movable up and down, a first lower punch 4 arranged in the lower side of the large hole portion 2a so as to be movable up and down, and having a small hole portion 4a communicating with the large hole portion 2a so that the metal powder is filled up, and a second lower punch 5 for forming the foot region W2, arranged in the lower side of the small hole portion 4a so as to be movable up and down in regard to the small hole portion 4a. The upper punch 3 has an upper punch body 31 arranged in the large hole portion 2a so as to be movable up and down, and a protruding portion 32 protruding toward an upper opening 4a1 of the small hole portion 4a from the lower surface 31a of the upper punch body 31.

Description

本発明は、足部を有する粉末成形体を成形する粉末成形用金型に関する。   The present invention relates to a powder molding die for molding a powder molded body having a foot.

足部を有する粉末成形体を成形する金型として、ダイと複数の下パンチとによって形成された凹部に金属粉末を充填した状態で、前記凹部の上方から上パンチを下降させて金属粉末を加圧成形するものが知られている（例えば、特許文献１参照）。   As a mold for forming a powder molded body having a foot portion, the metal powder is added by lowering the upper punch from above the concave portion while filling the concave portion formed by the die and the plurality of lower punches with the metal powder. What is pressure-molded is known (for example, refer to Patent Document 1).

図５は、従来の粉末成形用金型の側断面図であり、（ａ）は加圧直前の状態、（ｂ）は加圧途中の状態、（ｃ）は加圧後の状態を示している。この粉末成形用金型１００は、金属粉末が充填される大孔部１０１ａを有するダイ１０１と、前記大孔部１０１ａの上方に昇降可能に配設された上パンチ１０２と、前記大孔部１０１ａの下方に昇降可能に配設された第１下パンチ１０３と、この第１下パンチ１０３に形成された小孔部１０３ａの下方に昇降可能に配設された第２下パンチ１０４とを備えている。   FIG. 5 is a side sectional view of a conventional powder molding die, where (a) shows a state immediately before pressurization, (b) shows a state during pressurization, and (c) shows a state after pressurization. Yes. The mold 100 for powder molding includes a die 101 having a large hole portion 101a filled with metal powder, an upper punch 102 disposed so as to be movable up and down above the large hole portion 101a, and the large hole portion 101a. A first lower punch 103 disposed below the first lower punch 103 and a second lower punch 104 disposed below the small hole portion 103a formed in the first lower punch 103. Yes.

前記粉末成形用金型１００により粉末成形体を加圧成形する際は、図５（ａ）に示すように、大孔部１０１ａ及び小孔部１０３ａに金属粉末が充填された状態で、上パンチ１０２を下降させて大孔部１０１ａの上方から金属粉末を加圧する。これにより、図５（ｃ）に示すように、金属粉末が上パンチ１０２の下面と第１下パンチ１０３の上面とによって加圧され、粉末成形体１１０の本体部１１０ａが成形される。また、第２下パンチ１０４が、第１下パンチ１０３に対して相対的に上方へ移動することにより、前記小径部１０３ａ内の金属粉末が加圧され、粉末成形体１１０の足部１１０ｂが成形される。   When the powder molded body is pressure-molded by the powder molding die 100, as shown in FIG. 5 (a), the large punch portion 101a and the small hole portion 103a are filled with metal powder and the upper punch. 102 is lowered to pressurize the metal powder from above the large hole portion 101a. 5C, the metal powder is pressed by the lower surface of the upper punch 102 and the upper surface of the first lower punch 103, and the main body 110a of the powder compact 110 is formed. Further, when the second lower punch 104 moves upward relative to the first lower punch 103, the metal powder in the small diameter portion 103a is pressurized, and the foot portion 110b of the powder compact 110 is molded. Is done.

特開平７−２５８７０４号公報（図１３）JP-A-7-258704 (FIG. 13)

従来の上記粉末成型用金型１００では、大孔部１０１ａ内に充填された金属粉末は、図５（ｂ）に示すように、上パンチ１０２の下面や各下パンチ１０３，１０４の上面に接する部分Ｃから順に固化していく。その固化途中において、第２下パンチ１０４が第１下パンチ１０３に対して相対的に上方へ移動する際に、前記小孔部１０３ａ内の固化していない金属粉末（図５（ｂ）で示される領域Ｅ内の金属粉末）が、その上部開口から大孔部１０１ａ内に吹き上がるように移動する。その結果、小孔部１０３ａ内の金属粉末の量が所定量より不足するため、足部１１０ｂの密度が低下するという問題があった。   In the conventional powder molding die 100, the metal powder filled in the large hole portion 101a is in contact with the lower surface of the upper punch 102 and the upper surfaces of the lower punches 103 and 104, as shown in FIG. Solidify sequentially from part C. During the solidification, when the second lower punch 104 moves relatively upward with respect to the first lower punch 103, the non-solidified metal powder (shown in FIG. 5B) in the small hole portion 103a. The metal powder in the region E) moves so as to blow up from the upper opening into the large hole portion 101a. As a result, since the amount of the metal powder in the small hole portion 103a is less than a predetermined amount, there is a problem that the density of the foot portion 110b is lowered.

本発明は、このような事情に鑑みてなされたものであり、粉末成形体の足部の密度が低下するのを防止することができる粉末成形用金型を提供することを目的としている。   This invention is made | formed in view of such a situation, and it aims at providing the metal mold | die for powder molding which can prevent that the density of the leg part of a powder molded object falls.

（１）本発明の粉末成形用金型は、足部を有する粉末成形体を加圧成形する粉末成形用金型であって、金属粉末が充填される大孔部を有するダイと、前記大孔部内の上方に昇降可能に配設された上パンチと、前記大孔部内の下方に昇降可能に配設され、金属粉末が充填されるように前記大孔部に連通する小孔部を有する第１下パンチと、前記小孔部の下方において当該小孔部に対して昇降可能に配設され、前記足部を成形するための第２下パンチと、を備え、前記上パンチは、前記大孔部内に昇降可能に配設された上パンチ本体部と、この上パンチ本体部の下面から前記小孔部の上部開口に向けて突出する突出部とを有していることを特徴とする。   (1) A powder molding die of the present invention is a powder molding die for pressure-molding a powder molded body having a foot portion, the die having a large hole portion filled with metal powder, An upper punch disposed in the upper part of the hole so as to be movable up and down, and a small hole part disposed in the lower part of the large hole so as to be movable up and down and communicating with the large hole so as to be filled with metal powder. A first lower punch, and a second lower punch disposed below the small hole portion so as to be movable up and down relative to the small hole portion, and for forming the foot portion. It has an upper punch main body disposed in the large hole portion so as to be movable up and down, and a protrusion projecting from the lower surface of the upper punch main body portion toward the upper opening of the small hole portion. .

本発明によれば、上パンチは、上パンチ本体部の下面から小孔部の上部開口に向けて突出する突出部を有しているため、粉末成形体の加圧成形時に上パンチを大孔部内において下降させることにより、突出部を小孔部の上部開口に近接させることができる。これにより、第２下パンチが第１下パンチに対して上方へ移動する際に、小孔部内の固化していない金属粉末がその上部開口から大孔部内に吹き上がるのを突出部によって抑制することができる。その結果、粉末成形体の足部の密度が低下するのを防止することができる。   According to the present invention, the upper punch has a protruding portion that protrudes from the lower surface of the upper punch main body portion toward the upper opening of the small hole portion. By lowering the inside of the part, the projecting part can be brought close to the upper opening of the small hole part. Thereby, when the second lower punch moves upward with respect to the first lower punch, the protruding portion suppresses the unsolidified metal powder in the small hole portion from being blown into the large hole portion from the upper opening. be able to. As a result, it is possible to prevent the density of the legs of the powder molded body from decreasing.

（２）前記粉末成形用金型は、前記突出部の下面が、前記金属粉末を下方に加圧する加圧面とされていることが好ましい。この場合、加圧面となる突出部の下面に金属粉末が固化し易くなり、これによって固化した金属粉末は、小孔部の上部開口にさらに近接することになる。したがって、小孔部内の固化していない金属粉末がその上部開口から大孔部内に吹き上がるのを、前記固化した金属粉末によって効果的に抑制することができ、粉末成形体の足部の密度が低下するのを防止することができる。   (2) In the powder molding die, it is preferable that a lower surface of the protruding portion is a pressing surface that pressurizes the metal powder downward. In this case, the metal powder is easily solidified on the lower surface of the projecting portion serving as the pressing surface, and the solidified metal powder comes closer to the upper opening of the small hole portion. Therefore, the solidified metal powder can effectively prevent the unsolidified metal powder in the small hole portion from being blown into the large hole portion from the upper opening, and the density of the foot portion of the powder molded body can be reduced. It is possible to prevent the decrease.

（３）前記粉末成形用金型は、前記加圧面とされた前記突出部の下面が、前記第１下パンチの上面に対向しないように形成されていることが好ましい。この場合、突出部の下面と、小孔部の上部開口の周辺における第１下パンチの上面とによって、金属粉末が加圧されるのを防止することができるので、小孔部の上部開口の周辺において粉末成形体の密度が高くなり過ぎるのを防止することができる。   (3) It is preferable that the powder molding die is formed so that a lower surface of the protruding portion which is the pressing surface does not face an upper surface of the first lower punch. In this case, the metal powder can be prevented from being pressed by the lower surface of the protruding portion and the upper surface of the first lower punch around the upper opening of the small hole portion. It is possible to prevent the density of the powder compact from becoming too high in the periphery.

（４）前記突出部の高さは、前記第１下パンチの上面により加圧成形された粉末成形体の端面から、前記上パンチ本体部の下面により加圧成形された粉末成形体の端面までの高さＨに対して、１／３Ｈ〜２／３Ｈの範囲に設定されていることが好ましい。この場合、第２下パンチが第１下パンチに対して上方へ移動する際に、小孔部内の固化していない金属粉末がその上部開口から大孔部内に吹き上がるのを効果的に抑制することができる。その結果、粉末成形体の足部の密度が低下するのを防止することができる。   (4) The height of the projecting portion is from the end surface of the powder molded body press-formed by the upper surface of the first lower punch to the end surface of the powder molded body press-formed by the lower surface of the upper punch main body portion. The height H is preferably set in the range of 1 / 3H to 2 / 3H. In this case, when the second lower punch moves upward with respect to the first lower punch, it is possible to effectively suppress the unsolidified metal powder in the small hole portion from blowing up into the large hole portion from the upper opening. be able to. As a result, it is possible to prevent the density of the legs of the powder molded body from decreasing.

本発明によれば、第２下パンチが第１下パンチに対して上方へ移動する際に、小孔部内の固化していない金属粉末がその上部開口から大孔部側へ吹き上がるのを抑制することができ、粉末成形体の足部の密度が低下するのを防止することができる。   According to the present invention, when the second lower punch moves upward with respect to the first lower punch, the metal powder that has not solidified in the small hole portion is prevented from blowing up from the upper opening to the large hole portion side. It is possible to prevent the density of the legs of the powder molded body from being lowered.

本発明の一実施の形態に係る粉末成形用金型の側断面図であり、（ａ）は加圧直前の状態、（ｂ）は加圧途中の状態、（ｃ）は加圧後の状態を示している。It is a sectional side view of the metal mold | die for powder molding which concerns on one embodiment of this invention, (a) is the state just before pressurization, (b) is the state in the middle of pressurization, (c) is the state after pressurization Is shown. 粉末成形用金型により加圧成形された粉末成形体であり、（ａ）は平面図、（ｂ）は正面図である。It is a powder compact that is pressure-molded by a powder molding die, wherein (a) is a plan view and (b) is a front view. 上パンチの突出部の側断面図である。It is a sectional side view of the protrusion part of an upper punch. 粉末成形体の足部の密度を示す表である。It is a table | surface which shows the density of the leg | foot part of a powder compact. 従来の粉末成形用金型の側断面図であり、（ａ）は加圧直前の状態、（ｂ）は加圧途中の状態、（ｃ）は加圧後の状態を示している。It is a sectional side view of the conventional metal mold | die for powder molding, (a) is the state just before pressurization, (b) is the state in the middle of pressurization, (c) has shown the state after pressurization.

以下、本発明の実施の形態を図面に基づいて説明する。
図１は本発明の一実施の形態に係る粉末成形用金型の側断面図であり、（ａ）は加圧直前の状態、（ｂ）は加圧途中の状態、（ｃ）は加圧後の状態を示している。この粉末成形用金型１は、ダイ２と、上パンチ３と、第１下パンチ４と、第２下パンチ５とを備えており、図２（ａ）及び（ｂ）に示す粉末成形体Ｗを、所定の総加圧量（例えば、約１４ｔ）及び所定のプレススピード（例えば、１３個／ｍｉｎ）で加圧成形するのに用いられる。粉末成形体Ｗは、本体部Ｗ１と、当該本体部Ｗ１の下方に形成された足部Ｗ２とからなっている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view of a powder molding die according to an embodiment of the present invention. (A) is a state immediately before pressurization, (b) is a state in the middle of pressurization, and (c) is pressurization. The later state is shown. The powder molding die 1 includes a die 2, an upper punch 3, a first lower punch 4, and a second lower punch 5, and is a powder molded body shown in FIGS. 2 (a) and 2 (b). W is used for pressure molding at a predetermined total pressure (for example, about 14 t) and a predetermined press speed (for example, 13 pieces / min). The powder compact W includes a main body W1 and a foot W2 formed below the main body W1.

図１において、ダイ２は、円筒状に形成されており、金属粉末（例えば、４Ｎｉ−０．５Ｍｏ−１．５Ｃｕ−０．６Ｃ−残Ｆｅ）が充填される大孔部２ａを有している。また、ダイ２は、ダイプレート（図示省略）に支持されており、このダイプレートは、図示しないエアシリンダによりダイ２とともに昇降するようになっている。   In FIG. 1, the die 2 is formed in a cylindrical shape and has a large hole portion 2a filled with metal powder (for example, 4Ni-0.5Mo-1.5Cu-0.6C-residual Fe). Yes. The die 2 is supported by a die plate (not shown), and the die plate is moved up and down together with the die 2 by an air cylinder (not shown).

第１下パンチ４は、ダイ２の大孔部２ａ内の下方に、図示しないエアシリンダにより昇降可能に配設されている。この第１下パンチ４は、円筒状に形成されており、金属粉末が充填される小孔部４ａを有している。この小孔部４ａは、その孔径が大孔部２ａの孔径よりも小さく形成されているとともに、上部開口４ａ１が大孔部２ａに連通している。第１下パンチ４の上面４ｂは、前記大孔部２ａに充填された金属粉末を上方に加圧する加圧面とされている。   The first lower punch 4 is disposed below the large hole portion 2a of the die 2 so as to be moved up and down by an air cylinder (not shown). The first lower punch 4 is formed in a cylindrical shape and has a small hole portion 4a filled with metal powder. The small hole portion 4a is formed with a hole diameter smaller than that of the large hole portion 2a, and the upper opening 4a1 communicates with the large hole portion 2a. The upper surface 4b of the first lower punch 4 is a pressing surface that pressurizes the metal powder filled in the large hole portion 2a upward.

第２下パンチ５は、円柱状に形成されており、第１下パンチ４の小孔部４ａの下方に配設されている。第２下パンチ５の下端は、位置固定されたベースプレート（図示省略）上に取り付けられており、第１下パンチ４が昇降することにより、第２下パンチ５が当該第１下パンチ４に対して相対的に昇降するようになっている。第２下パンチ５の上面５ａは、小孔部２ａに充填された金属粉末を上方に加圧する加圧面とされている。   The second lower punch 5 is formed in a columnar shape, and is disposed below the small hole portion 4 a of the first lower punch 4. The lower end of the second lower punch 5 is attached to a base plate (not shown) whose position is fixed, and the second lower punch 5 is moved relative to the first lower punch 4 by moving the first lower punch 4 up and down. Are relatively raised and lowered. The upper surface 5a of the second lower punch 5 is a pressing surface that pressurizes the metal powder filled in the small hole portion 2a upward.

上パンチ３は、ダイ２の大孔部２ａ内の上方に配設されており、図示しないエアシリンダにより昇降可能な上パンチ本体部３１と、この上パンチ本体部３１の下面３１ａから下方に突出する突出部３２とを有している。   The upper punch 3 is disposed above the large hole 2a of the die 2 and protrudes downward from an upper punch main body 31 that can be moved up and down by an air cylinder (not shown) and a lower surface 31a of the upper punch main body 31. Projecting portion 32.

上パンチ本体部３１は、円柱状に形成されており、その下面３１ａは前記大孔部２ａに充填された金属粉末を下方に加圧する加圧面とされている。この下面３１ａと第１下パンチ４の上面４ｂとによって金属粉末を加圧することにより、粉末成形体Ｗの本体部Ｗ１が成形されるようになっている。   The upper punch main body 31 is formed in a cylindrical shape, and the lower surface 31a is a pressing surface that pressurizes the metal powder filled in the large hole portion 2a downward. By pressing the metal powder with the lower surface 31a and the upper surface 4b of the first lower punch 4, the main body W1 of the powder compact W is formed.

突出部３２は、上パンチ本体部３１の下面３１ａの中心部から前記小孔部４ａの上部開口４ａ１に向けて突出している。図３は、突出部３２の拡大側断面図である。突出部３２は、下方に向かって漸次縮径するように截頭円錐体状に形成されており、その側面と上パンチ本体部３１の下面３１ａとの角度θは、例えば１００〜１０５度の間（本実施形態では１０５度）の鈍角に設定されている。これにより、加圧成形後に上パンチ３を上昇させる際に、突出部３２を粉末成形体Ｗから容易に抜き取ることができる。   The protruding portion 32 protrudes from the center portion of the lower surface 31a of the upper punch main body portion 31 toward the upper opening 4a1 of the small hole portion 4a. FIG. 3 is an enlarged side sectional view of the protrusion 32. The protrusion 32 is formed in a truncated cone shape so that the diameter gradually decreases downward, and the angle θ between the side surface and the lower surface 31a of the upper punch main body 31 is, for example, between 100 and 105 degrees. The obtuse angle is set to 105 degrees in this embodiment. Thereby, when raising the upper punch 3 after pressure molding, the protrusion part 32 can be easily extracted from the powder compact W.

突出部３２の下面３２ａは、第２下パンチ５の上面５ａと対向するように水平に形成されており、小孔部４ａに充填された金属粉末を下方に加圧する加圧面とされている。この下面３２ａと第２下パンチ５の上面５ａとによって金属粉末を加圧することにより、粉末成形体Ｗの足部Ｗ２が成形されるようになっている。   The lower surface 32a of the protrusion 32 is formed horizontally so as to face the upper surface 5a of the second lower punch 5, and serves as a pressing surface that pressurizes the metal powder filled in the small hole portion 4a downward. By pressing the metal powder with the lower surface 32a and the upper surface 5a of the second lower punch 5, the foot portion W2 of the powder compact W is formed.

突出部３２の下面３２ａの直径ｄは、第１下パンチ４の上面４ｂに対向しないように、小孔部４ａの孔径Ｄ（図１（ａ）参照）以下の長さ（好ましくは孔径Ｄよりも若干短い長さ）に形成されている。本実施の形態では、前記孔径Ｄは約３．０ｍｍ、前記直径ｄは約２．７ｍｍに設定されている。   The diameter d of the lower surface 32a of the protrusion 32 is not longer than the upper surface 4b of the first lower punch 4 and is not longer than the hole diameter D (see FIG. 1A) of the small hole portion 4a (preferably from the hole diameter D). Is also slightly shorter). In the present embodiment, the hole diameter D is set to about 3.0 mm, and the diameter d is set to about 2.7 mm.

図３において、突出部３２の高さｈは、第１下パンチ４の上面４ｂにより加圧成形された本体部Ｗ１の下面（端面）から、上パンチ本体部３１の下面３１ａにより加圧成形された本体部Ｗ１の上面（端面）までの高さＨ（図２（ｂ）参照）に対して、１／３Ｈ〜２／３Ｈの範囲に設定されている。本実施の形態では、前記高さＨは５ｍｍ、前記高さｈは２．５ｍｍに設定されている。   In FIG. 3, the height h of the protrusion 32 is pressure-formed by the lower surface 31 a of the upper punch main body 31 from the lower surface (end surface) of the main body W <b> 1 press-formed by the upper surface 4 b of the first lower punch 4. The height H (see FIG. 2B) up to the upper surface (end surface) of the main body W1 is set in a range of 1 / 3H to 2 / 3H. In the present embodiment, the height H is set to 5 mm, and the height h is set to 2.5 mm.

次に前述した粉末成形用金型１により粉末成形体Ｗを加圧成形する方法について説明する。まず、ダイ２及び第１下パンチ４をエアリンダにより所定の位置まで上昇させ、上パンチ３が上方に退避した状態で、ダイ２の大孔部２ａ及び第１下パンチ４の小孔部４ａに金属粉末を充填させる。次いで、上パンチ３を下降させ、図１（ａ）に示すように、上パンチ本体部３１の下面３１ａにより大孔部２ａの上部開口を閉鎖する。   Next, a method for pressure-molding the powder compact W with the powder molding die 1 will be described. First, the die 2 and the first lower punch 4 are raised to a predetermined position by the air cylinder, and the upper punch 3 is retracted upward, and the large hole portion 2a of the die 2 and the small hole portion 4a of the first lower punch 4 are formed. Fill with metal powder. Next, the upper punch 3 is lowered, and the upper opening of the large hole portion 2a is closed by the lower surface 31a of the upper punch main body 31 as shown in FIG.

この状態から、さらに上パンチ３を下降させると、図１（ｂ）に示すように、これに連動してダイ２及び第１下パンチ４が徐々に下降する。その際、ダイ２及び第１下パンチ４の下降量は上パンチ３の下降量よりも少ないため、大孔部２ａ内の金属粉末は、上パンチ本体部３１の下面３１ａと第１下パンチ４の上面４ｂとの間で加圧され、小孔部４ａ内の金属粉末は、突出部３２の下面３２ａと第２下パンチ５の上面５ａとによって加圧される。   When the upper punch 3 is further lowered from this state, the die 2 and the first lower punch 4 are gradually lowered in conjunction with this, as shown in FIG. At this time, since the lowering amount of the die 2 and the first lower punch 4 is smaller than the lowering amount of the upper punch 3, the metal powder in the large hole portion 2 a is separated from the lower surface 31 a of the upper punch body portion 31 and the first lower punch 4. The metal powder in the small hole portion 4 a is pressed by the lower surface 32 a of the protruding portion 32 and the upper surface 5 a of the second lower punch 5.

そうすると、大孔部２ａ内及び小孔部４ａ内の金属粉末は、図１（ｂ）に示すように、加圧面となる前記下面３１ａ，３２ａ及び前記上面４ｂ，５ａに接する部分Ａから順に固化していく。その際、第１下パンチ４の下降により第２下パンチ５が相対的に小孔部４ａ内を上昇するため、これに伴って小孔部４ａ内の固化していない金属粉末（図１（ｂ）で示される領域Ｂ内の金属粉末）が、その上部開口４ａ１側へ押し上げられる。しかし、突出部３２の下面３２ａが小孔部４ａの上部開口４ａ１に近接しているため、前記領域Ｂ内の金属粉末は、突出部３２に邪魔されることにより、大孔部２ａ内への吹き上がりが抑制される。   Then, the metal powder in the large hole portion 2a and the small hole portion 4a is solidified in order from the lower surface 31a, 32a to be the pressing surface and the portion A in contact with the upper surface 4b, 5a as shown in FIG. I will do it. At this time, since the second lower punch 5 relatively moves up in the small hole portion 4a by the lowering of the first lower punch 4, the metal powder not solidified in the small hole portion 4a (FIG. 1 ( The metal powder in the region B indicated by b) is pushed up to the upper opening 4a1 side. However, since the lower surface 32a of the projecting portion 32 is close to the upper opening 4a1 of the small hole portion 4a, the metal powder in the region B is obstructed by the projecting portion 32, and thus enters the large hole portion 2a. Blowing up is suppressed.

上パンチ３を、図１（ｂ）の状態からさらに下降させると、大孔部２ａ内及び小孔部４ａ内のすべての金属粉末が加圧されて固化し、図１（ｃ）に示すように、粉末成形体Ｗが成型される。   When the upper punch 3 is further lowered from the state of FIG. 1 (b), all the metal powder in the large hole portion 2a and the small hole portion 4a are pressed and solidified, as shown in FIG. 1 (c). Then, the powder compact W is molded.

以上、本発明の実施の形態に係る粉末成形用金型１によれば、上パンチ３は、上パンチ本体部３１の下面３１ａから小孔部４ａの上部開口４ａ１に向けて突出する突出部３２を有しているため、粉末成形体Ｗの加圧成形時に上パンチ３を大孔部２ａにおいて下降させることにより、突出部３２を小孔部４ａの上部開口４ａ１に近接させることができる。これにより、第２下パンチ５が小孔部４ａに対して上昇する際に、小孔部４ａ内の固化していない金属粉末がその上部開口４ａ１から大孔部２ａ内に吹き上がるのを突出部３２によって抑制することができる。その結果、粉末成形体Ｗの足部Ｗ２の密度が低下するのを防止することができる。   As described above, according to the powder molding die 1 according to the embodiment of the present invention, the upper punch 3 protrudes from the lower surface 31a of the upper punch main body 31 toward the upper opening 4a1 of the small hole portion 4a. Therefore, the protrusion 32 can be brought close to the upper opening 4a1 of the small hole portion 4a by lowering the upper punch 3 in the large hole portion 2a during the pressure forming of the powder compact W. As a result, when the second lower punch 5 rises with respect to the small hole portion 4a, the metal powder not solidified in the small hole portion 4a protrudes from the upper opening 4a1 into the large hole portion 2a. It can be suppressed by the portion 32. As a result, it is possible to prevent the density of the foot W2 of the powder molded body W from being lowered.

図４は、上記実施形態に係る粉末成形用金型において、上パンチの形状を変更した場合の粉末成形体の足部の密度を示す表である。図４に示すように、上パンチが突出部を有しない場合、前記足部の密度は６．５〜６．６ｇ／ｃｍ３となっている。これに対して、上パンチが突出部を有する場合は、前記足部の密度は７．１ｇ／ｃｍ３以上となり、突出部を有しない場合よりも足密度が高くなっているのが分かる。 FIG. 4 is a table showing the density of the foot portion of the powder molded body when the shape of the upper punch is changed in the powder molding die according to the embodiment. As shown in FIG. 4, when the upper punch does not have a protruding portion, the density of the foot portion is 6.5 to 6.6 g / cm 3 . On the other hand, when the upper punch has a protruding portion, the density of the foot portion is 7.1 g / cm 3 or more, which indicates that the foot density is higher than that when the upper punch does not have the protruding portion.

また、突出部３２の下面３２ａが、金属粉末を下方に加圧する加圧面とされているため、加圧面となる前記下面３２ａに金属粉末が固化し易くなり、これによって固化した金属粉末（前記部分Ａの一部）は、小孔部４ａの上部開口４ａ１にさらに近接することになる。したがって、小孔部４ａ内の固化していない金属粉末がその上部開口４ａ１から大孔部２ａ内に吹き上がるのを、前記固化した金属粉末によって効果的に抑制することができ、粉末成形体Ｗの足部Ｗ２の密度が低下するのを防止することができる。   In addition, since the lower surface 32a of the protrusion 32 is a pressing surface that pressurizes the metal powder downward, the metal powder is easily solidified on the lower surface 32a serving as the pressing surface, and the solidified metal powder (the portion described above) (Part of A) is further closer to the upper opening 4a1 of the small hole portion 4a. Accordingly, the solidified metal powder can effectively suppress the unsolidified metal powder in the small hole portion 4a from being blown into the large hole portion 2a from the upper opening 4a1, and the powder compact W It is possible to prevent the density of the foot part W2 from decreasing.

また、加圧面とされた突出部３２の下面３２ａが、第１下パンチ４の上面４ｂに対向しないように形成されているため、突出部３２の下面３２ａと、小孔部４ａの上部開口４ａ１の周辺における前記上面４ｂとによって、金属粉末が加圧されるのを防止することができる。これにより、小孔部４ａの上部開口４ａ１の周辺において粉末成形体Ｗの本体部Ｗ１の密度が高くなり過ぎるのを防止することができる。   Further, since the lower surface 32a of the protruding portion 32 that is the pressing surface is formed so as not to face the upper surface 4b of the first lower punch 4, the lower surface 32a of the protruding portion 32 and the upper opening 4a1 of the small hole portion 4a. It is possible to prevent the metal powder from being pressed by the upper surface 4b in the periphery of the metal. Thereby, it can prevent that the density of the main-body part W1 of the powder compact W becomes too high around the upper opening 4a1 of the small hole part 4a.

また、突出部３２の高さｈは、第１下パンチ４の上面４ｂにより加圧成形された本体部Ｗ１の下面（端面）から、上パンチ本体部３１の下面３１ａにより加圧成形された本体部Ｗ１の上面（端面）までの高さＨに対して、１／３Ｈ〜２／３Ｈの範囲に設定されているため、第２下パンチ５が小孔部４ａに対して上昇する際に、小孔部４ａ内の固化していない金属粉末がその上部開口４ａ１から大孔部２ａ内に吹き上がるのを突出部３２によって効果的に抑制することができる。その結果、粉末成形体Ｗの足部Ｗ２の密度が低下するのを防止することができる。   Further, the height h of the protrusion 32 is such that the main body press-formed by the lower surface 31a of the upper punch main body 31 from the lower surface (end surface) of the main body W1 press-formed by the upper surface 4b of the first lower punch 4. Since the height H up to the upper surface (end surface) of the portion W1 is set in a range of 1 / 3H to 2 / 3H, when the second lower punch 5 rises with respect to the small hole portion 4a, It is possible to effectively suppress the metal powder not solidified in the small hole portion 4a from being blown from the upper opening 4a1 into the large hole portion 2a. As a result, it is possible to prevent the density of the foot W2 of the powder molded body W from being lowered.

今回開示された実施の形態はすべての点で例示であって制限的なものでないと考えられるべきである。本発明の範囲は、上記した意味ではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味、及び範囲内でのすべての変更が含まれることが意図される。   The embodiment disclosed this time must be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

例えば、前述した実施の形態では、突出部を截頭円錐体状に形成しているが、上パンチ本体部の下面から小孔部の上部開口に向けて突出していれば、円柱状や角柱状など、任意の形状に形成することができる。また、突出部の下面を水平に形成しているが、凹状や凸状、又は凹凸状に形成することもできる。   For example, in the above-described embodiment, the projecting portion is formed in a truncated cone shape. However, if the projecting portion projects from the lower surface of the upper punch main body portion toward the upper opening of the small hole portion, a cylindrical shape or a prismatic shape For example, it can be formed in an arbitrary shape. Moreover, although the lower surface of the protrusion part is formed horizontally, it can also be formed in a concave shape, a convex shape, or an uneven shape.

さらに、前述した実施の形態では、粉末成形用金型の下パンチは、第１下パンチと第２下パンチとに分割されているが、３つ以上に分割されていてもよい。   Furthermore, in the embodiment described above, the lower punch of the powder molding die is divided into the first lower punch and the second lower punch, but may be divided into three or more.

１ 粉末成形用金型
２ ダイ
２ａ 大孔部
３ 上パンチ
４ 第１下パンチ
４ａ 小孔部
４ａ１ 上部開口
５ 第２下パンチ
３１ 上パンチ本体部
３２ 突出部
Ｗ 粉末成形体
Ｗ２ 足部 DESCRIPTION OF SYMBOLS 1 Powder shaping | molding die 2 Die 2a Large hole part 3 Upper punch 4 1st lower punch 4a Small hole part 4a1 Upper opening 5 2nd lower punch 31 Upper punch main-body part 32 Projection part W Powder molded object W2 Foot part

Claims (4)

足部を有する粉末成形体を加圧成形する粉末成形用金型であって、
金属粉末が充填される大孔部を有するダイと、
前記大孔部内の上方に昇降可能に配設された上パンチと、
前記大孔部内の下方に昇降可能に配設され、金属粉末が充填されるように前記大孔部に連通する小孔部を有する第１下パンチと、
前記小孔部の下方において当該小孔部に対して昇降可能に配設され、前記足部を成形するための第２下パンチと、を備え、
前記上パンチは、前記大孔部内に昇降可能に配設された上パンチ本体部と、この上パンチ本体部の下面から前記小孔部の上部開口に向けて突出する突出部とを有していることを特徴とする粉末成形用金型。 A powder molding die for pressure molding a powder molded body having a foot part,
A die having a large hole filled with metal powder;
An upper punch disposed so as to be movable up and down in the large hole portion;
A first lower punch having a small hole portion which is disposed so as to be movable up and down below the large hole portion and communicates with the large hole portion so as to be filled with metal powder;
A second lower punch for forming the foot portion, which is disposed below the small hole portion so as to be movable up and down relative to the small hole portion,
The upper punch has an upper punch main body disposed in the large hole portion so as to be movable up and down, and a protrusion projecting from the lower surface of the upper punch main body portion toward the upper opening of the small hole portion. A mold for powder molding characterized by the above. 前記突出部の下面が、前記金属粉末を下方に加圧する加圧面とされている請求項１に記載の粉末成形用金型。   The powder molding die according to claim 1, wherein a lower surface of the protruding portion is a pressing surface that pressurizes the metal powder downward. 前記加圧面とされた前記突出部の下面が、前記第１下パンチの上面に対向しないように形成されている請求項２に記載の粉末成形用金型。   3. The powder molding die according to claim 2, wherein a lower surface of the protruding portion which is the pressing surface is formed so as not to face an upper surface of the first lower punch. 前記突出部の高さは、前記第１下パンチの上面により加圧成形された粉末成形体の端面から、前記上パンチ本体部の下面により加圧成形された粉末成形体の端面までの高さＨに対して、１／３Ｈ〜２／３Ｈの範囲に設定されている請求項１〜３のいずれか一項に記載の粉末成形用金型。   The height of the projecting portion is the height from the end surface of the powder compact that is press-formed by the upper surface of the first lower punch to the end surface of the powder compact that is press-formed by the lower surface of the upper punch main body. The powder molding die according to any one of claims 1 to 3, wherein the mold is set in a range of 1 / 3H to 2 / 3H with respect to H.
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Publication number Priority date Publication date Assignee Title
CN104550465A (en) * 2014-12-15 2015-04-29 云南光电辅料有限公司 Arc convex surface-shaped assembling die and manufacturing method thereof

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JP2007083250A (en) * 2005-09-20 2007-04-05 Sumitomo Denko Shoketsu Gokin Kk Powder compacting method and powder compacting device
JP2010082625A (en) * 2008-09-29 2010-04-15 Hitachi Powdered Metals Co Ltd Molding die device and method for molding dieed body having female screw part-fitted shaft hole using the same

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Publication number Priority date Publication date Assignee Title
JPH0874525A (en) * 1994-09-09 1996-03-19 Fuji Oozx Inc Tappet for internal combustion engine and manufacture thereof
JP2007083250A (en) * 2005-09-20 2007-04-05 Sumitomo Denko Shoketsu Gokin Kk Powder compacting method and powder compacting device
JP2010082625A (en) * 2008-09-29 2010-04-15 Hitachi Powdered Metals Co Ltd Molding die device and method for molding dieed body having female screw part-fitted shaft hole using the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104550465A (en) * 2014-12-15 2015-04-29 云南光电辅料有限公司 Arc convex surface-shaped assembling die and manufacturing method thereof

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