JP6004532B2 - Sizing core mold - Google Patents

Sizing core mold Download PDF

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JP6004532B2
JP6004532B2 JP2012244353A JP2012244353A JP6004532B2 JP 6004532 B2 JP6004532 B2 JP 6004532B2 JP 2012244353 A JP2012244353 A JP 2012244353A JP 2012244353 A JP2012244353 A JP 2012244353A JP 6004532 B2 JP6004532 B2 JP 6004532B2
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core mold
columnar
sizing
cemented carbide
hole
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JP2014091153A (en
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仁志 池谷
仁志 池谷
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Sumitomo Electric Sintered Alloy Ltd
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この発明は、孔付き部品のサイジングに利用するコア金型に関する。   The present invention relates to a core mold used for sizing a holed part.

粉末冶金法で製造される孔付き焼結部品の中に、内接歯車ポンプ用のポンプロータなどのように高い孔精度が要求されるものがある。そのような孔付き焼結部品については、焼結後にサイジング処理を行って孔精度を高めることがなされている。   Some sintered parts with holes manufactured by powder metallurgy require high hole accuracy such as pump rotors for internal gear pumps. For such holed sintered parts, sizing treatment is performed after sintering to increase hole accuracy.

そのサイジングによる孔形状と孔寸法の矯正は、ダイとパンチとコアを組み合わせたサイジング用金型によってなされる。   The correction of the hole shape and hole size by the sizing is performed by a sizing die in which a die, a punch and a core are combined.

サイジング用金型のコアは、図3に示すようなもの、即ち、一般に鋼で形成される本体11の先端に超硬ヘッド12を取り付け、その超硬ヘッド12で部品をしごいて矯正するものが通常利用されている。なお、本体11は、プレス機のヨークなどに締結される取付け部13を有しており、その取付け部13から立ち上がった柱状部14の上端に超硬ヘッド12が接合されている。   The core of the sizing mold is as shown in FIG. 3, that is, a cemented carbide head 12 is attached to the tip of a main body 11 generally formed of steel, and parts are corrected with the cemented carbide head 12 for correction. Is normally used. The main body 11 has a mounting portion 13 fastened to a yoke or the like of a press machine, and a cemented carbide head 12 is joined to the upper end of a columnar portion 14 rising from the mounting portion 13.

本体の柱状部14に対する超硬ヘッド12の接合は、柱状部14の上端に切頭円錐形の凹部15を設け、その凹部15に超硬ヘッド12の下端に形成した切頭円錐形の凸部16を挿入してテーパ嵌合させ(その嵌合部の高さ寸法は、直径がφ20mmのコアで約15mm)、そのテーパ嵌合部を鑞付けする方法で行なわれている。なお、下記特許文献1が従来技術として取り上げているように、前記凹部に代えてV字状の溝を、前記凸部に代えてV字状の突起をそれぞれ設け、その両者をテーパ嵌合させて鑞付けすることもなされている。   The cemented carbide head 12 is joined to the columnar portion 14 of the main body by providing a truncated conical recess 15 at the upper end of the columnar portion 14, and a truncated cone-shaped convex portion formed at the lower end of the cemented carbide head 12. 16 is inserted and taper-fitted (the height of the fitting portion is about 15 mm for a core having a diameter of 20 mm), and the taper fitting portion is brazed. As disclosed in Patent Document 1 below, a V-shaped groove is provided in place of the concave portion, and a V-shaped protrusion is provided in place of the convex portion, and both are taper-fitted. It is also made to give.

特開平7−300602号公報Japanese Patent Laid-Open No. 7-300602

本体の上端に超硬ヘッドをテーパ嵌合させて鑞付けして接合した従来のコア金型は、本体に対する超硬ヘッドの接合強度が不足しがちで超硬ヘッドが本体から外れ易い。   The conventional core mold in which a cemented carbide head is taper-fitted to the upper end of the main body and is brazed and joined tends to have insufficient joining strength of the cemented carbide head to the main body, and the cemented carbide head tends to come off the main body.

図3に示したコア金型の圧縮荷重による変形状態の解析結果を誇張して図4に示す。図3のサイジング用コア金型10は、柱状部14の外周に回り止め用のキーを係合させるキー溝17を設けており、そのキー溝の設置によって柱状部14の強度が周方向の1箇所で弱くなっている。そのために、圧縮荷重を受けると図4に示すような撓みを生じる。   FIG. 4 exaggerates the analysis result of the deformation state due to the compressive load of the core mold shown in FIG. The sizing core mold 10 shown in FIG. 3 is provided with a key groove 17 that engages a rotation-preventing key on the outer periphery of the columnar portion 14, and the strength of the columnar portion 14 in the circumferential direction is increased by the installation of the key groove. It is weak at the point. Therefore, when a compressive load is received, the bending as shown in FIG. 4 occurs.

その撓みの影響などで超硬ヘッド12の鑞付け接合部に無理な力が加わり、接合部が剥がれて超硬ヘッド12が本体11から外れることがあった。その超硬ヘッドの外れは、サイジングにおける部品の引き抜き過程でも生じることがあった。これは、小径のコア金型では、鑞付け接合部の接合面積を十分に確保するのが難しいことに起因すると考えられる。   For example, an excessive force is applied to the brazed joint of the carbide head 12 due to the influence of the bending, and the joint is peeled off and the carbide head 12 may come off the main body 11. The separation of the cemented carbide head may occur in the part drawing process during sizing. This is considered to be due to the fact that it is difficult to ensure a sufficient bonding area of the brazed joint in the small-diameter core mold.

前掲の特許文献1は、その超硬ヘッドの外れの問題に対応するために、超硬ヘッドをスリーブ状にし、これを本体の柱状部の上端に設けた小径軸部(突出部)の外周に嵌める構造を提案しているが、この構造は、コア金型の直径が小さいときには超硬ヘッドの肉厚や本体の上端の小径軸部の直径を十分に確保することができず、使用規制を受ける。   In the above-mentioned Patent Document 1, in order to cope with the problem of separation of the cemented carbide head, the cemented carbide head is formed into a sleeve shape, and this is formed on the outer periphery of a small diameter shaft portion (projecting portion) provided at the upper end of the columnar portion of the main body. Although a structure to be fitted is proposed, this structure cannot ensure the thickness of the carbide head and the diameter of the small diameter shaft at the upper end of the main body when the diameter of the core mold is small. receive.

この発明は、直径の小さなコア金型であってもサイジング時の圧縮荷重や引き抜き荷重による損壊が抑制され、構造面からの使用規制も受けないようにすることを課題としている。   An object of the present invention is to prevent damage caused by a compressive load or a pull-out load during sizing even in a core mold having a small diameter, and to prevent use restrictions from the structural surface.

上記の課題を解決するため、この発明においては、取付け部から立ち上がらせた柱状部の上端に成形部を有し、その成形部で上記孔をしごいて矯正するサイジング用コア金型を以下の通りに構成した。即ち、全体を前記取付け部と超硬合金によって形成される主体部とに分け、前記主体部に前記柱状部及び成形部を備えさせ、前記柱状部の下端を前記取付け部の上面に設けた取付け孔に差し込んで鑞付け接合した。   In order to solve the above-described problems, in the present invention, a sizing core mold that has a molded part at the upper end of a columnar part raised from an attachment part, and corrects the above-mentioned hole by squeezing is provided as follows. Configured as street. That is, the whole is divided into the attachment part and a main part formed of cemented carbide, the main part is provided with the columnar part and the molding part, and the lower end of the columnar part is provided on the upper surface of the attachment part. It was inserted into the hole and brazed.

このコア金型は、前記柱状部の長手途中に従来のキー溝に代えて2面幅の面取り部を設け、その面取り部の平面をストッパで拘束する構造にして回り止めを行うと軸方向圧縮荷重による図4のような撓みが抑制されて好ましい。   This core mold is provided with a chamfered portion having a width of two faces in place of the conventional key groove in the middle of the columnar portion, and is compressed in the axial direction when the chamfered portion is constrained by a stopper to prevent rotation. The bending as shown in FIG. 4 due to the load is preferably suppressed.

この発明のコア金型は、主体部に含まれる柱状部の下端を取付け部の上面に設けた孔に差し込んで鑞付け接合しており、柱状部の上端に超硬ヘッドをテーパ嵌合させて鑞付けする構造に比べて鑞付け接合部の接合面積を大きく確保することができる。   In the core mold of the present invention, the lower end of the columnar part included in the main body part is inserted into a hole provided in the upper surface of the mounting part and brazed, and a carbide head is taper-fitted to the upper end of the columnar part. Compared to the structure to be brazed, it is possible to ensure a large joint area of the brazed joint.

そのために、接合強度が高まり、圧縮荷重や引っ張り荷重に対する耐力が大きくなってコア金型の破壊が防止される。   For this reason, the bonding strength is increased, the yield strength against compressive load and tensile load is increased, and the core mold is prevented from being broken.

また、この発明のコア金型は、柱状部の上端を小径にする必要がない。成形部もスリーブ状にする必要がなく、そのために、成形部の直径が小さい場合、例えば、その直径がφ15mm〜φ20mm程度しかないと言った場合にも、強度面での使用規制を受けることがない。   Moreover, the core metal mold | die of this invention does not need to make the upper end of a columnar part small diameter. The molded part does not need to be formed into a sleeve shape. Therefore, when the diameter of the molded part is small, for example, when the diameter is only about φ15 mm to φ20 mm, it is subject to use restrictions in terms of strength. Absent.

この発明のサイジング用コア金型の一例を示す部分破断側面図Partially broken side view showing an example of the sizing core mold of the present invention 図1のII−II線に沿った拡大断面図Expanded sectional view along the line II-II in FIG. 従来のサイジング用コア金型の一例を示す部分破断側面図Partially broken side view showing an example of a conventional sizing core mold 図3のコア金型の圧縮荷重による撓みの説明図Explanatory drawing of the bending by the compressive load of the core metal mold | die of FIG.

以下、この発明のサイジング用コア金型の実施の形態を、添付図面の図1、図2に基づいて説明する。図1に示すように、この発明のサイジング用コア金型1は、取付け部2と主体部5によって構成される。   Embodiments of a sizing core mold according to the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings. As shown in FIG. 1, a sizing core mold 1 according to the present invention includes an attachment portion 2 and a main portion 5.

取付け部2は、鋼で形成されており、この取付け部2がコア金型を支持するプレス機のヨークなどに固定される。この取付け部2には、上面に開口する垂直な取付け孔3とその取付け孔の底から外部に至る空気抜き孔4がそれぞれ設けられている。   The attachment portion 2 is made of steel, and this attachment portion 2 is fixed to a yoke or the like of a press machine that supports the core mold. The attachment portion 2 is provided with a vertical attachment hole 3 opened on the upper surface and an air vent hole 4 extending from the bottom of the attachment hole to the outside.

主体部5は、全体が超硬合金によって形成されたものであって、取付け部2から立ち上る柱状部6とその柱状部の上端に連なる成形部7とからなる。その柱状部6と成形部7は、基本形が断面円形をなすものであって、柱状部6の長手途中には、従来のキー溝に代わる2面幅の面取り部8が設けられている。その面取り部8は、キー溝に比べて加工性と圧縮荷重に対する耐性に優れる。   The main body 5 is entirely formed of cemented carbide, and includes a columnar portion 6 rising from the mounting portion 2 and a molded portion 7 connected to the upper end of the columnar portion. The columnar portion 6 and the molded portion 7 have a circular cross section as a basic shape, and a chamfered portion 8 having a two-surface width is provided in the middle of the columnar portion 6 in place of the conventional key groove. The chamfered portion 8 is excellent in workability and resistance to compressive load as compared with the keyway.

この主体部5は、柱状部6の下端を取付け部2の取付け孔3に挿入し、その挿入部の外面と取付け孔3の内面を鑞付けすることで取付け部2に連結されている。   The main body portion 5 is connected to the attachment portion 2 by inserting the lower end of the columnar portion 6 into the attachment hole 3 of the attachment portion 2 and brazing the outer surface of the insertion portion and the inner surface of the attachment hole 3.

このために、嵌合部の直径が細くならず(従来構造では、嵌合部の直径は柱状部6の直径よりも小さくなる)、嵌合部の高さ寸法(=取付け孔3の孔深さ)も十分に確保可能になっており、これにより、鑞付け接合部の接合面積が柱状部の先端に超硬ヘッドを鑞付けする従来構造に比べて大きくし、なおかつ、嵌合部をストレート嵌合にして接合強度を高めることが可能になった。   For this reason, the diameter of the fitting portion does not become thin (in the conventional structure, the diameter of the fitting portion is smaller than the diameter of the columnar portion 6), and the height dimension of the fitting portion (= depth of the mounting hole 3) This also makes it possible to secure a sufficient amount of the joint area of the brazed joint compared to the conventional structure in which a cemented carbide head is brazed to the tip of the columnar part, and the fitting part is straight. It has become possible to increase the joint strength by fitting.

−実施例−
図1に示した構造のコア金型を試作した。
そのコア金型の寸法諸元は以下の通りである。
コア金型の全高H=280mm
主体部の長さL=250mm
主体部の直径D=15mmと20mmの2種類
面取り部の2面幅の面間寸法=13mm
取付け部に設けられた取付け孔の深さd=20mm
主体部材料:タングステン(W)88wt%−Co12wt%の組成の超硬合金
取付け部材料:ニッケルクロムモリブデン鋼(SNCM−447)
-Example-
A core mold having the structure shown in FIG.
The dimensions of the core mold are as follows.
Total height of core mold H = 280mm
Length of main part L = 250mm
2 types of main part diameter D = 15 mm and 20 mm Chamfered part width between faces = 13 mm
Depth of mounting hole provided in mounting part d = 20mm
Material of main part: Tungsten (W) Cemented carbide with composition of 88wt% -Co12wt% Mounting material: Nickel chromium molybdenum steel (SNCM-447)

この試作コア金型を使用して、内接歯車ポンプ用ロータの中心に設けられるφ15mmとφ20mmの孔のサイジングを行った。その結果、図3の従来構造では超硬ヘッドが外れることがあったが、発明品のコア金型は、主体部の外れが全く起こらなかった。   Using this prototype core mold, holes of φ15 mm and φ20 mm provided at the center of the rotor for the internal gear pump were sized. As a result, in the conventional structure of FIG. 3, the cemented carbide head may come off, but in the core mold of the invention, the main part did not come off at all.

これは、鑞付け部の接合面積が大きくなっていること、主体部の全体が超硬合金からなるために柱状部が撓み難くなっていること、鑞付け部がストレート嵌合になっており、そのために、従来のテーパ嵌合に比べてサイジング対象品を引き抜くときの引っ張り応力が接合部に引き剥がし力として加わり難くなっていることの相乗効果によると考えられる。   This is because the joining area of the brazing part is large, the main part is made of cemented carbide and the columnar part is difficult to bend, the brazing part is a straight fit, Therefore, it is considered that this is due to a synergistic effect that the tensile stress when pulling out the sizing target product is less likely to be applied as a peeling force to the joint as compared with the conventional taper fitting.

ちなみに、超硬ヘッドの直径がφ20mm、テーパ嵌合させた鑞付け部の高さが15mmの従来のコア金型の鑞付け面積Sは、493.8mmであったのに対し、発明品の試作コア金型(主体部直径φ20mm)の鑞付け面積Sは、692.7mmであった。 Incidentally, the brazing area S of a conventional core mold having a carbide head diameter of φ20 mm and a taper-fitted brazing portion height of 15 mm was 493.8 mm 2 , whereas The brazing area S of the prototype core mold (main body diameter φ20 mm) was 692.7 mm.

この場合、コア金型に加わる引き抜き荷重Wが2502kgであるとすると、従来のコア金型の鑞付けに対しては5.7kg/mmの応力が加わるが、発明品のコア金型ではその応力が3.61kg/mmとなって大きく軽減される。 In this case, if the drawing load W applied to the core mold is 2502 kg, a stress of 5.7 kg / mm 2 is applied to the brazing of the conventional core mold. The stress is greatly reduced to 3.61 kg / mm 2 .

1、10 サイジング用コア金型
2 取付け部
3 取付け孔
4 空気抜き孔
5 主体部
6 柱状部
7 成形部
8 面取り部
11 本体
12 超硬ヘッド
13 取付け部
14 柱状部
15 凹部
16 凸部
17 キー溝
H コア金型の高さ
L 主体部の長さ
d 取付け孔の深さ
D 主体部直径
DESCRIPTION OF SYMBOLS 1, 10 Core mold for sizing 2 Mounting part 3 Mounting hole 4 Air vent hole 5 Main part 6 Columnar part 7 Molding part 8 Chamfered part 11 Body 12 Carbide head 13 Mounting part 14 Columnar part 15 Recessed part 16 Convex part 17 Keyway H Core mold height L Length of main part d Depth of mounting hole D Diameter of main part

Claims (2)

取付け部(2)から立ち上がらせた柱状部(6)の上端に成形部(7)を有し、その成
形部(7)で製品の孔をしごいて矯正するサイジング用コア金型であって、全体を前記取付け部(2)と超硬合金によって形成される主体部(5)とに分け、前記取付け部(2)を鋼で形成し、前記主体部(5)に前記柱状部(6)及び成形部(7)を備えさせ、前記柱状部(6)の外径の一定した下端を前記取付け部(2)の上面に設けた取付け孔(3)に差し込んで鑞付け接合したサイジング用コア金型。
A sizing core mold having a molded part (7) at the upper end of a columnar part (6) raised from an attachment part (2), and squeezing and correcting a hole in the product at the molded part (7). the mounting portion across and (2), divided into main section (5) which is formed by a cemented carbide, the attachment portion (2) is formed of steel, the columnar portion to the main portion (5) ( 6) and a molded part (7), and the lower end side of the columnar part (6) having a constant outer diameter is inserted into a mounting hole (3) provided on the upper surface of the mounting part (2) and brazed. Sizing core mold.
前記柱状部(6)の長手途中に2面幅の面取り部(8)を設け、その面取り部(8)を利用して使用時の回り止めを行うようにした請求項1に記載のサイジング用コア金型。   The sizing according to claim 1, wherein a chamfered portion (8) having a width of two faces is provided in the middle of the columnar portion (6), and the chamfered portion (8) is used to prevent rotation during use. Core mold.
JP2012244353A 2012-11-06 2012-11-06 Sizing core mold Active JP6004532B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6078830U (en) * 1983-11-01 1985-06-01 ダイハツ工業株式会社 Sizing equipment for sintered parts
JPH05186809A (en) * 1992-01-09 1993-07-27 Kenseishiya:Kk Method for sizing oil impregnated metal and device therefor and sizing tool used for the same
JP2001212618A (en) * 2000-02-02 2001-08-07 Hitachi Powdered Metals Co Ltd Core rod forming internal diameter face of oil impregnated sintered bearing
JP2011088182A (en) * 2009-10-22 2011-05-06 Sumitomo Electric Sintered Alloy Ltd Die for powder compacting and method for assembling the die

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