JP2014100738A - Powder molding die - Google Patents

Powder molding die Download PDF

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JP2014100738A
JP2014100738A JP2012256252A JP2012256252A JP2014100738A JP 2014100738 A JP2014100738 A JP 2014100738A JP 2012256252 A JP2012256252 A JP 2012256252A JP 2012256252 A JP2012256252 A JP 2012256252A JP 2014100738 A JP2014100738 A JP 2014100738A
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molding
punch
powder
flanges
die
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Hitoshi Shibuya
仁志 渋谷
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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 improve accuracy of products by providing flanges on an outer periphery of one end of a boss part, and reducing inclination of the flanges and irregularity of the end surface caused by sinter in a sintered component on which concavities and so on are provided and the concavities cause density difference of the flanges.SOLUTION: In the powder molding die for molding powder molding body of a sintered component having flanges on an outer periphery on one end of a boss part and concavities, grooves and holes distributed unevenly on a way of peripheral direction of the flanges, a molding surface of punch for molding the flanges of the molding body, is inclined to a direction which absorbs inclination and irregularity caused by sinter of the flanges.

Description

この発明は、ボス部の一端外周に鍔を有する焼結部品、詳しくは、鍔に凹部や溝などが偏在して設けられている焼結部品の製造に利用する粉末成形用金型に関する。   The present invention relates to a sintered part having a ridge on the outer periphery of one end of a boss part, and more particularly to a powder molding die used for manufacturing a sintered part in which a recess, a groove, and the like are unevenly provided in a ridge.

粉末冶金法で製造される鍔付き焼結部品の一例を図９に示す。図示の焼結部品１０は、空調機器などに利用されるコンプレッサ用の軸受であって、ボス部１１の一端外周に鍔１２を有する。その鍔１２のボス部側の端面には凹部１３が偏在して設けられている。   FIG. 9 shows an example of a brazed sintered part manufactured by powder metallurgy. The illustrated sintered component 10 is a compressor bearing used in an air conditioner or the like, and has a flange 12 on the outer periphery of one end of the boss portion 11. Concave portions 13 are unevenly provided on the end surface of the flange 12 on the boss portion side.

このような焼結部品は、粉末の成形体を焼結して作られ、図９に示す形状の焼結部品１０は、ダイ１、上パンチ２、下パンチ３及びコアロッド４を組み合わせた金型を用い、キャビティに投入した粉末を図１０のように、上下のパンチで圧縮して粉末の成形体Ａを作り、その成形体を焼結して製造される。成形体を成形する金型は、例えば、鍔１２の反ボス部側の端面ｆ１が軸直角な平面である場合には、その端面ｆ１を成形する上パンチ２の成形面（下面）を軸直角な面にしたものが使用されている。   Such a sintered part is made by sintering a powder compact, and a sintered part 10 having a shape shown in FIG. 9 is a die in which a die 1, an upper punch 2, a lower punch 3 and a core rod 4 are combined. As shown in FIG. 10, the powder put into the cavity is compressed with upper and lower punches to form a powder compact A, and the compact is sintered. For example, when the end surface f1 on the side opposite to the boss portion of the flange 12 is a plane perpendicular to the axis, the mold for molding the molded body has a molding surface (lower surface) of the upper punch 2 that molds the end surface f1 perpendicular to the axis. What is used on the surface is used.

下パンチ３も同様である。例えば、図９の形状の成形体を作る際には、下１〜下３の３つの下パンチ３−１，３−２，３−３が用いられ、焼結部品のボス部側の端面ｆ２が軸直角な平面である場合には、その面を成形する下１パンチ３−１の成形面（上面）を軸直角な面にしたものが使用されている（例えば、下記特許文献１参照）。 The same applies to the lower punch 3. For example, when making a molded body having the shape of FIG. 9, three lower punches 3 −1 , 3 −2 , and 3 −3 of lower 1 to lower 3 are used, and an end surface f2 on the boss portion side of the sintered part. Is a plane perpendicular to the axis, a molding surface (upper surface) of the lower punch 3-1 that molds the surface is used as a plane perpendicular to the axis (for example, see Patent Document 1 below). .

特開平１１−２２３１８９号公報JP-A-11-223189 特開平５−９３２０２号公報Japanese Patent Laid-Open No. 5-93202

図９に示したような焼結部品１０は、ボス部１１と鍔１２の密度に不可避の差が生じる。また、鍔に局部的な肉厚変化を生じる凹部が偏在して設けられているため、鍔１２の各部の密度にも差が生じる。ボス部１１の軸方向長さが長い製品は特に、ボス部用の粉末が成形時に鍔側に流れる傾向があるが、凹部設置側と他部側では粉末の流れ方に差があり、それが原因で鍔の各部の密度差が大きくなり易い。   In the sintered part 10 as shown in FIG. 9, an inevitable difference occurs in the density of the boss portion 11 and the flange 12. Moreover, since the recessed part which produces a local thickness change is unevenly provided in the collar, a difference arises also in the density of each part of the collar 12. FIG. The product with a long axial length of the boss part 11 has a tendency that the powder for the boss part flows to the heel side at the time of molding, but there is a difference in the powder flow between the recessed part installation side and the other part side. For this reason, the density difference between each part of the ridge tends to increase.

その密度差や特殊な鍔形状などが原因で成形体を焼結したときに製品に歪が生じて軸方向の振れ（鍔の傾き）や鍔の平坦度の悪化（反り）を招く。   When the green body is sintered due to the difference in density or the shape of a special ridge, the product is distorted, causing axial deflection (an inclination of the ridge) and deterioration of the flatness (warp) of the ridge.

なお、前掲の特許文献２は、鍔の下面（反ボス部側の端面）の平坦度の悪化を抑えるために、粉末を成形するときに鍔の下面を外径側で鍔の厚みが増す方向にテーパ状に傾斜させ、その下面が上を向く姿勢にして成形体の焼結を行うことを提案している。   In addition, in the above-mentioned patent document 2, in order to suppress the deterioration of the flatness of the lower surface of the ridge (the end surface on the side opposite to the boss portion), the thickness of the ridge increases on the outer diameter side of the heel when forming the powder. It is proposed to sinter the molded body in such a manner that it is inclined in a taper shape with the lower surface facing upward.

しかしながら、図９に示したような焼結部品は、偏在している凹部などの影響によって鍔の歪が周方向の各部において一定せず、そのために、前掲の特許文献２の方法では、歪の効果的な抑制を期待することができない。   However, in the sintered part as shown in FIG. 9, the distortion of the wrinkles is not constant in each part in the circumferential direction due to the influence of unevenly distributed recesses and the like. An effective suppression cannot be expected.

この発明は、ボス部の一端外周に鍔を備え、その鍔に密度差を生じさせる凹部などが設けられている焼結部品の前記鍔の焼結による傾きと端面の歪を減少させて製品の精度を向上させることを課題としている。   According to the present invention, a boss is provided on the outer periphery of one end of the boss portion, and the inclination due to sintering of the heel and distortion of the end surface of a sintered part provided with a recess or the like that causes a density difference in the heel are reduced. The task is to improve accuracy.

上記の課題を解決するため、この発明においては、ボス部の一端外周に鍔を有し、その鍔の周方向途中に凹部や溝や孔が偏在して設けられた焼結部品の粉末の成形体を成形する粉末成形用金型のパンチに以下の工夫を施した。
即ち、前記パンチの成形体の鍔を成形する成形面の一部又は全域を、前記鍔の焼結に起因した傾きと歪を吸収する方向に傾斜させた。 In order to solve the above-described problems, in the present invention, powder molding of a sintered part having a flange on one end outer periphery of the boss portion, and having a recess, a groove or a hole unevenly provided in the circumferential direction of the flange. The following ingenuity was applied to the punch of the powder molding die for molding the body.
That is, a part or the whole of the molding surface for molding the punch of the punch molded body was inclined in a direction to absorb inclination and strain caused by sintering of the punch.

パンチの成形面は、平面の成形面にしてそれを傾斜させたものと、外径側が軸方向に後退する円錐面にして成形面の円錐の中心の軸をパンチの軸心に対して鍔の焼結による傾きと歪を吸収する方向に傾けたものの２通りが考えられる。   The punch molding surface is a flat molding surface that is inclined, and the outer diameter side is a conical surface that recedes in the axial direction. Two types are possible: a tilt due to sintering and a tilt inclined to absorb strain.

どちらの形態の成形面も、その面を傾斜させたことによって生じる成形面の高低差が鍔の寸法公差よりも小さく収まる範囲においてその成形面を傾斜させる。   In both forms of the molding surface, the molding surface is inclined in a range in which the height difference of the molding surface caused by inclining the surface is smaller than the dimensional tolerance of the ridge.

なお、この発明は主に上パンチに適用するが、下パンチに成形される側の鍔の端面も焼結による傾きや歪を生じることがあるので、下パンチの成形面を傾斜させ、或いは、軸の傾いた円錐面となすこともあり得る。   Although the present invention is mainly applied to the upper punch, since the end surface of the flange formed on the lower punch may also be inclined or distorted by sintering, the molding surface of the lower punch is inclined, or It can also be a conical surface with an inclined axis.

この発明の粉末成形用金型は、焼結する前の成形体の鍔に対して、焼結によって生じる歪の方向とは反対向きの傾きをパンチの成形面を傾けることで付与する。これにより、焼結によって生じる鍔の傾きや鍔面の歪が吸収され、精度の向上した製品（焼結部品）が得られる。   The powder molding die according to the present invention imparts an inclination in a direction opposite to the direction of strain generated by sintering to the wrinkles of the molded body before sintering by inclining the molding surface of the punch. Thereby, the inclination of the wrinkles and the distortion of the wrinkles generated by the sintering are absorbed, and a product (sintered part) with improved accuracy is obtained.

この発明の粉末成形用金型の一例を示す断面図Sectional drawing which shows an example of the metal mold | die for powder molding of this invention 図１の粉末成形用金型の上パンチの端面図End view of the upper punch of the powder mold shown in FIG. 上パンチの図２のＢ−Ｏ−Ｂ線に沿った断面図Sectional drawing along the BOB line of FIG. 2 of an upper punch 上パンチの先端部の図２のＡ−Ｏ−Ａ線に沿った断面図Sectional drawing along the AOA line of FIG. 2 of the front-end | tip part of an upper punch 図１の発明の粉末成形用金型による粉末の圧縮成形状態を示す断面図Sectional drawing which shows the compression molding state of the powder by the metal mold | die for powder molding of invention of FIG. この発明の粉末成形用金型の他の実施形態の上パンチの端面図End view of the upper punch of another embodiment of the powder molding die of the present invention 上パンチの図６のＣ−Ｏ−Ｃ線に沿った断面図Sectional drawing along the C-O-C line of FIG. 6 of an upper punch 上パンチの先端部の図６のＤ−Ｏ−Ｄ線に沿った断面図Sectional drawing along the DOD line of FIG. 6 of the front-end | tip part of an upper punch （ａ）この発明の粉末成形用金型で成形して製造する焼結部品の一例を示す斜視図、（ｂ）同上の焼結部品のボス部側の端面図(A) Perspective view showing an example of a sintered part produced by molding with the powder molding die of the present invention, (b) End view on the boss part side of the sintered part same as above 図９の焼結部品の成形に用いられる従来の粉末成形用金型の断面図Sectional view of a conventional powder molding die used for molding the sintered part of FIG.

以下、この発明の粉末成形用金型の実施の形態を添付図面の図１〜図８に基づいて説明する。例示の粉末成形用金型は、図９に示した焼結部品用成形体の製造に利用されるものであって、ダイ１と、上パンチ２と、下１パンチ３−１、下２パンチ３−２、下３パンチ３−３の３つからなる下パンチ３と、コアロッド４を組み合わせて構成されている。 Embodiments of a powder molding die according to the present invention will be described below with reference to FIGS. 1 to 8 of the accompanying drawings. The illustrated powder molding die is used for manufacturing the sintered compact for a sintered part shown in FIG. 9, and includes a die 1, an upper punch 2, a lower 1 punch 3 −1 , and a lower 2 punch. The lower punch 3 composed of 3 −2 and the lower 3 punch 3 −3 and the core rod 4 are combined.

この図１の粉末成形用金型は、上パンチ２に工夫を施しており、ダイ１、下パンチ３、コアロッド４は、図１０に示した従来の金型と同様の構成となっている。   In the powder molding die shown in FIG. 1, the upper punch 2 is devised, and the die 1, the lower punch 3, and the core rod 4 have the same configuration as the conventional die shown in FIG.

上パンチ２は、図２の線Ａ−Ｏ−Ａに沿った断面を表した図４からわかるように、先端の成形面２ａを平面の面で構成して一方向に傾斜させている。図３は、図２の線Ｂ−Ｏ−Ｂに沿った断面であり、この図には成形面２ａの傾きは現われていない。   As can be seen from FIG. 4 showing a cross section along the line A-O-A in FIG. 2, the upper punch 2 is formed by inclining the molding surface 2 a at the tip with a flat surface and tilting in one direction. FIG. 3 is a cross section taken along line B-O-B in FIG. 2, and the inclination of the molding surface 2 a does not appear in this figure.

その成形面２ａの図４に示した傾斜角αは、その図１の金型を使用して製造される焼結部品の鍔の厚みが寸法公差内に収まる範囲に（成形面を傾斜させることによって生じる鍔の厚み変動量が寸法公差内に収まるように）設定される。   The inclination angle α shown in FIG. 4 of the molding surface 2a is within a range in which the thickness of the flaw of a sintered part manufactured using the mold shown in FIG. Is set so that the variation in the thickness of the wrinkles caused by is within dimensional tolerances).

例えば、鍔の直径がφ６０ｍｍ程度の製品の場合、勾配が５／１００ｍｍ〜１５／１００ｍｍ程度であれば成形面２ａを図４のように傾けても鍔の厚み変動量を寸法公差内に収めることができる。   For example, in the case of a product having a ridge diameter of about 60 mm, if the gradient is about 5/100 mm to 15/100 mm, the variation in thickness of the ridge will be within the dimensional tolerance even if the molding surface 2a is tilted as shown in FIG. Can do.

このように構成された図１の粉末成形用金型は、ダイ１と下１〜下３の各下パンチ３−１〜３−３とコアロッド４との間に形成されるキャビティ５に原料粉末Ｐを投入し、上パンチ２を駆動してその原料粉末Ｐを図５のように圧縮成形する。 The powder molding die of FIG. 1 configured in this way is a raw material powder in the cavity 5 formed between the die 1 and the lower punches 3 -1 to 3 -3 and the core rod 4. P is charged and the upper punch 2 is driven to compress the raw material powder P as shown in FIG.

このとき、上パンチ２の成形面２ａに付与する傾きは、製造される焼結部品の焼結に起因した鍔の傾きと歪を吸収する方向となっている。そのために、焼結に起因した鍔の傾きと歪が打ち消されて製品の鍔の傾きと歪が小さくなる。   At this time, the inclination imparted to the molding surface 2a of the upper punch 2 is in a direction to absorb the inclination and distortion of the wrinkles resulting from the sintering of the sintered part to be manufactured. For this reason, the inclination and strain of the wrinkles due to sintering are canceled out, and the inclination and strain of the wrinkles of the product are reduced.

図６〜図８は、上パンチの他の形態を示している。この上パンチ２は、図８に示すように、成形面２ａを外径側が軸方向に後退する円錐面にして円錐の中心の軸Ｌを、上パンチ２の軸心Ｃに対して製造する焼結部品の鍔の厚みが寸法公差内に収まる角度範囲で傾斜させている。   6 to 8 show other forms of the upper punch. As shown in FIG. 8, the upper punch 2 is a sintered body that manufactures the axis L at the center of the cone with respect to the axis C of the upper punch 2 by forming the molding surface 2 a into a conical surface whose outer diameter side recedes in the axial direction. The thickness of the ridges of the connecting parts is inclined within an angle range that is within dimensional tolerances.

この上パンチ２は、図６の線Ｃ−Ｏ−Ｃに沿った断面を表した図７では、成形面２ａが上パンチ２の軸心ＣＬを基準にして左右対称に傾いている。一方、図６の線Ｄ−Ｏ−Ｄに沿った図８の断面では、成形面２ａが上パンチ２の軸心ＣＬに対してβ傾いた軸Ｌを基準にして対称をなすように傾いており、これにより、成形面の傾きによって補正される鍔の傾き量や歪量が上パンチの中心を境にした反対側で異なったものになる。   In FIG. 7, which shows a cross section along the line C—O—C in FIG. 6, the upper punch 2 is inclined symmetrically with respect to the axis CL of the upper punch 2. On the other hand, in the cross section of FIG. 8 along the line D-O-D of FIG. 6, the molding surface 2 a is inclined so as to be symmetric with respect to the axis L inclined by β with respect to the axis CL of the upper punch 2. Accordingly, the inclination amount and distortion amount of the wrinkles corrected by the inclination of the molding surface are different on the opposite side with respect to the center of the upper punch.

焼結部品の鍔に設ける凹部や溝や偏在した孔の大きさや設置数、或いは配置状態などによっては、焼結した製品の鍔の全域がボス部を支点にして反り、しかも、鍔のボス部を境にして相反する側でその反りの程度に差がつくことがある。   Depending on the size, number of installations, or arrangement of the recesses, grooves, and unevenly distributed holes in the sintered part, the entire area of the sintered product warps with the boss as a fulcrum. There may be a difference in the degree of warping on the opposite side.

そのようなときに、上パンチ２の成形面２ａを図６〜図８で説明したような形状にすることが有効になる。   In such a case, it is effective to form the molding surface 2a of the upper punch 2 as described with reference to FIGS.

成形面２ａを円錐面にしてその円錐面の中心の軸を傾ける金型も、成形面２ａを軸の傾いた円錐面にしたことによる焼結部品の鍔の厚み変動量が鍔の寸法公差内に収まる範囲で成形面に傾きを付与する。   The mold which makes the forming surface 2a a conical surface and inclines the central axis of the conical surface is also within the dimensional tolerance of the wrinkle thickness of the sintered part due to the forming surface 2a being the inclined conical surface. Inclination is imparted to the molding surface within a range that falls within the range.

なお、例示の粉末成形用金型は、上パンチの成形面を傾けたが、下パンチの成形面や上下のパンチの成形面を上記同様に傾けることもできる。   In the exemplary powder molding die, the molding surface of the upper punch is tilted, but the molding surface of the lower punch and the molding surfaces of the upper and lower punches can be tilted in the same manner as described above.

１ ダイ
２ 上パンチ
２ａ 成形面
３ 下パンチ
３−１ 下１パンチ
３−２ 下２パンチ
３−３ 下３パンチ
４ コアロッド
５ キャビティ
Ｐ 原料粉末
α 上パンチの成形面の傾斜角
ＣＬ 上パンチの軸心
Ｌ 円錐の成形面の円錐の中心の軸
β 軸Ｌの軸心Ｃに対する傾き角
１０ 焼結部品
１１ ボス部
１２ 鍔
１３ 凹部
ｆ１ 鍔の反ボス部側の端面
ｆ２ 鍔のボス部側の端面 DESCRIPTION OF SYMBOLS 1 Die 2 Upper punch 2a Molding surface 3 Lower punch 3-1 Lower 1 punch 3-2 Lower 2 punch 3-3 Lower 3 punch 4 Core rod 5 Cavity P Raw material powder alpha Inclination angle CL of upper punch molding surface Upper punch axis Center L Inclination angle 10 of cone center surface of cone β relative to axis L of axis L of axis L Sintered component 11 Boss portion 12 鍔 13 Recess f1 End surface on opposite boss portion side of fist 鍔 End surface on boss portion side of 鍔

Claims (3)

ボス部（１１）の一端外周に鍔（１２）を有し、その鍔の周方向途中に凹部（１３）や溝や孔が偏在して設けられた焼結部品（１０）の粉末の成形体を成形する粉末成形用金型であって、ダイ（１）と、上下のパンチ（２，３）を有し、前記パンチの前記成形体の鍔を成形する成形面（２ａ）の一部又は全域を、焼結に起因した前記鍔の傾きと歪を吸収する方向に傾斜させた粉末成形用金型。   Powder molded body of sintered component (10) having a ridge (12) on the outer periphery of one end of the boss portion (11), and a recess (13), a groove or a hole being unevenly distributed in the circumferential direction of the ridge A mold for powder molding, comprising a die (1) and upper and lower punches (2, 3), a part of a molding surface (2a) for molding the punch of the molded body of the punch, A powder molding die in which the entire region is inclined in a direction to absorb the inclination and strain of the wrinkles caused by sintering. パンチの成形面（２ａ）を平面の成形面にしてその成形面を前記焼結部品の鍔（１２）の厚みが寸法公差内に収まる角度範囲で傾斜させた請求項１に記載の粉末成形用金型。   2. The powder molding according to claim 1, wherein the molding surface (2a) of the punch is a flat molding surface, and the molding surface is inclined within an angular range in which the thickness of the flange (12) of the sintered part falls within a dimensional tolerance. Mold. パンチの成形面（２ａ）を外径側が軸方向に後退する円錐面にして円錐の中心の軸（Ｌ）を、パンチの軸心（ＣＬ）に対して前記焼結部品の鍔の厚みが寸法公差内に収まる角度範囲で傾斜させた請求項１に記載の粉末成形用金型。   The punch forming surface (2a) is a conical surface whose outer diameter side recedes in the axial direction, and the axis (L) at the center of the cone is set to the thickness of the ridge of the sintered part with respect to the axis (CL) of the punch. The powder molding die according to claim 1, wherein the mold is tilted within an angular range that falls within a tolerance.
JP2012256252A 2012-11-22 2012-11-22 Powder molding die Pending JP2014100738A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017046333A1 (en) * 2015-09-18 2017-03-23 Gkn Sinter Metals Engineering Gmbh Sintering press with axially controlled deformation, and corresponding method
WO2017046332A1 (en) * 2015-09-18 2017-03-23 Gkn Sinter Metals Engineering Gmbh Punching tool of a sintering press and method therefor

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JPH0593202A (en) * 1991-09-30 1993-04-16 Mitsubishi Materials Corp Production of sintered compact
JP2003088994A (en) * 2001-09-14 2003-03-25 Sumitomo Special Metals Co Ltd Device and method for forming ring-shaped magnet
JP2010031331A (en) * 2008-07-30 2010-02-12 Sumitomo Electric Sintered Alloy Ltd Powder molding die

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0593202A (en) * 1991-09-30 1993-04-16 Mitsubishi Materials Corp Production of sintered compact
JP2003088994A (en) * 2001-09-14 2003-03-25 Sumitomo Special Metals Co Ltd Device and method for forming ring-shaped magnet
JP2010031331A (en) * 2008-07-30 2010-02-12 Sumitomo Electric Sintered Alloy Ltd Powder molding die

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017046333A1 (en) * 2015-09-18 2017-03-23 Gkn Sinter Metals Engineering Gmbh Sintering press with axially controlled deformation, and corresponding method
WO2017046332A1 (en) * 2015-09-18 2017-03-23 Gkn Sinter Metals Engineering Gmbh Punching tool of a sintering press and method therefor
CN108290218A (en) * 2015-09-18 2018-07-17 吉凯恩粉末冶金工程有限公司 The stamping tool and its method of sintering press
US11577310B2 (en) * 2015-09-18 2023-02-14 Gkn Sinter Metals Engineering Gmbh Sintering press with axially controlled deformation, and corresponding method
US11577311B2 (en) * 2015-09-18 2023-02-14 Gkn Sinter Metals Engineering Gmbh Punching tool of a sintering press and method therefor

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