JP4257742B2 - Method for manufacturing drum-shaped parts - Google Patents

Method for manufacturing drum-shaped parts Download PDF

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JP4257742B2
JP4257742B2 JP2004202973A JP2004202973A JP4257742B2 JP 4257742 B2 JP4257742 B2 JP 4257742B2 JP 2004202973 A JP2004202973 A JP 2004202973A JP 2004202973 A JP2004202973 A JP 2004202973A JP 4257742 B2 JP4257742 B2 JP 4257742B2
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sleeve
plate
drum
plate material
manufacturing
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JP2006021234A (en
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卓矢 山崎
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JATCO Ltd
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Description

本発明は、車両の自動変速機に用いられるクラッチドラムや遊星歯車機構のリングギヤ等の、ドラム形状を有する部品を冷間塑性加工により製造する方法に関するものである。   The present invention relates to a method of manufacturing a part having a drum shape, such as a clutch drum used in an automatic transmission of a vehicle or a ring gear of a planetary gear mechanism, by cold plastic working.

かかるドラム形部品の製造方法として、例えば特許文献1に記載されているものがある。この方法においては、内歯車の製造に際し、ボス部材とドラム部材とを重ねて成形用金型と押型で挟んで回転させ、複数の成形ローラによりこれら部材を成形用金型に押し付けて所要の外形および内歯を有する形状に成形すると共に、ボス部材とドラム部材とを一体化させている。   For example, Patent Document 1 discloses a method for manufacturing such a drum-shaped part. In this method, when the internal gear is manufactured, the boss member and the drum member are overlapped and rotated by being sandwiched between a molding die and a pressing die, and these members are pressed against the molding die by a plurality of molding rollers. In addition, the boss member and the drum member are integrated into a shape having an internal tooth.

この方法においては、ドラム部材をボス部材を覆うようにしてこれらを一体化させており、しかも内歯車底部におけるドラム部材の板厚が、成形前のそれを維持している。それによって、成形した内歯車の底部が肉厚となるため内歯車自体の重量を増加させることとなり、軽量化のためには、底部の肉厚を低減化させるべく切削や研削などの二次加工を行う必要がある。   In this method, the drum member is integrated so as to cover the boss member, and the plate thickness of the drum member at the bottom of the internal gear maintains that before molding. As a result, the thickness of the bottom of the molded internal gear is increased, which increases the weight of the internal gear itself. For weight reduction, secondary processing such as cutting and grinding is performed to reduce the thickness of the bottom. Need to do.

また、この方法においては、外形をドラム形状に成形すると同時に成形用金型に形成した歯形を用いて内面に内歯(スプライン)を形成しているが、ドラム部材の成形前の板厚は、形成する内歯の歯丈に応じて決まるため、歯丈の高いスプラインを形成する場合、板厚が大きめの部材を用意する必要があり、その結果、成形後のドラム部材との接合箇所の厚さや寸法が必要以上に大きなものとなり得る。このこともまた、内歯車の重量を増加させる要因となり、やはり二次加工を行って軽量化を図る必要がある。
特開平7-51781号公報
Further, in this method, the outer shape is formed into a drum shape, and at the same time, the inner teeth (splines) are formed on the inner surface using the tooth profile formed on the molding die. Since it is determined according to the height of the inner teeth to be formed, when forming a spline with a high tooth height, it is necessary to prepare a member with a larger plate thickness, and as a result, the thickness of the joint portion with the drum member after molding The sheath dimensions can be larger than necessary. This also increases the weight of the internal gear, and it is also necessary to reduce the weight by performing secondary processing.
JP-A-7-51781

本発明は、上述した従来技術の問題点に鑑み、冷間塑性加工によりドラム形状を有する部品の製造を行うに際し、部品の軽量化を図れると共に成形後の二次加工を必要としない製造方法を提供することを目的とするものである。   In view of the problems of the prior art described above, the present invention provides a manufacturing method that can reduce the weight of a component and does not require secondary processing after molding when manufacturing a drum-shaped component by cold plastic processing. It is intended to provide.

この目的のため、第一発明によるドラム形部品の製造方法は、
略円筒形のスリーブとリング形の板材とを接合し、次いでこれを成形することによりドラム形状を有する部品を製造する方法であって、
前記スリーブの外面に周方向に凹溝を形成する工程と、
前記凹溝と前記板材の内側端部とが半径方向に対向するように、第一の治具上に前記スリーブおよび前記板材を固定する工程と、
第一の成形ローラにより前記板材を半径方向外側から中心部に向けて肉寄せして当該板材を前記凹溝で前記スリーブと接合させる工程と、
第二の治具および成形用金型との間に前記接合した前記スリーブと前記板材を固定し、第二の成形ローラにより前記板材を前記成形用金型に押し付けてドラム形状に成形する工程と、
を具えることを特徴とするものである。
For this purpose, the method of manufacturing a drum-shaped part according to the first invention is:
A method of manufacturing a part having a drum shape by joining a substantially cylindrical sleeve and a ring-shaped plate, and then molding the same,
Forming a groove in the circumferential direction on the outer surface of the sleeve;
Fixing the sleeve and the plate on the first jig so that the concave groove and the inner end of the plate are opposed to each other in the radial direction ;
A step of bringing the plate material from the radially outer side toward the center by a first forming roller and joining the plate material to the sleeve through the concave groove;
Fixing the joined sleeve and the plate material between a second jig and a molding die, and pressing the plate material against the molding die by a second molding roller to form a drum shape; ,
It is characterized by comprising.

更に、この第一発明によるドラム形部品の製造方法は、前記板材に対しその半径方向の所定位置から前記肉寄せを行い、当該肉寄せを開始する位置から半径方向内側の部分を部品底部とし、半径方向外側の部分を前記第二の成形ローラにより前記成形用金型に押し付けてドラム形状に成形することを特徴とするものである。Furthermore, in the method for manufacturing a drum-shaped part according to the first aspect of the present invention, the meat material is gathered from a predetermined position in the radial direction with respect to the plate material, and a part radially inward from the position where the meat gathering is started is used as a part bottom part. A radially outer portion is pressed against the molding die by the second molding roller to form a drum shape.

第二発明によるドラム形部品の製造方法は、前記第一発明において、The method for manufacturing a drum-shaped part according to the second invention is the above first invention,
前記スリーブの前記凹溝に隣接させて該スリーブの半径方向に突出する突起部を形成し、前記板材を肉寄せさせて前記突起部および凹溝に当該板材をかしめることにより、前記スリーブと前記板材とを接合することを特徴とするものである。Protruding portions projecting in the radial direction of the sleeve are formed adjacent to the concave grooves of the sleeve, and the plate material is brought closer together and the plate material is caulked in the protruding portions and the concave grooves, whereby the sleeve and the It is characterized by joining plate materials.

第三発明によるドラム形部品の製造方法は、前記第一または第二発明において、According to a third aspect of the present invention, there is provided a method for manufacturing a drum-shaped part, wherein
前記スリーブの底部にフランジを設け、A flange is provided at the bottom of the sleeve,
前記第一の治具上に前記スリーブおよび前記板材を固定する際、前記スリーブのフランジ上に前記板材を載置することにより、前記スリーブに対して前記板材を位置決めすることを特徴とするものである。When fixing the sleeve and the plate material on the first jig, the plate material is positioned with respect to the sleeve by placing the plate material on a flange of the sleeve. is there.

本発明によるドラム形部品の製造方法においては、部品を製造するための素材である略円筒形のスリーブとリング形の板材とを接合する際、板材を肉寄せして***させ、この***させた部分でスリーブとの接合を行うこととしている。すなわち、肉寄せを行うことにより板材の肉厚を薄くしながらスリーブと接合させることとなり、成形後の肉厚が必要以上に厚くならず、二次加工を行う必要無しにドラム形部品の軽量化を図ることができる。しかもスリーブを略円筒形としていることにより、製造したドラム形部品に他の部品を組み付ける際の位置決めや、スリーブ自体に部品を取り付けることが容易なものとなる。   In the method for manufacturing a drum-shaped part according to the present invention, when the substantially cylindrical sleeve, which is a material for manufacturing the part, and the ring-shaped plate material are joined, the plate material is raised and raised. It is supposed that the part is joined to the sleeve. In other words, the thickness of the plate material is reduced by joining together with the sleeve, so that the thickness after molding does not become unnecessarily thick, and the weight of the drum-shaped part is reduced without the need for secondary processing. Can be achieved. In addition, since the sleeve has a substantially cylindrical shape, positioning when assembling other components to the manufactured drum-shaped component and mounting of the component on the sleeve itself are facilitated.

さらに本発明によるドラム形部品の製造方法においては、板材の、第二の成形ローラによって成形を行う部分は肉寄せを行わず、成形前の板厚を維持させている。換言すれば、外形をドラム形状に成形する際、特に成形と同時に成形用金型に形成した歯形を用いて内面にスプラインを形成するような場合、板材の板厚を必要以上に大きくしなくても部品の製造が可能となり、成形後の二次加工を必要とせず、部品の軽量化を図ることができる。Further, in the method of manufacturing a drum-shaped part according to the present invention, the portion of the plate material that is formed by the second forming roller is not subjected to meat gathering, and the plate thickness before forming is maintained. In other words, when forming the outer shape into a drum shape, especially when forming splines on the inner surface using the tooth profile formed on the molding die at the same time as molding, the plate thickness of the plate material must not be increased more than necessary. In addition, parts can be manufactured, and secondary processing after molding is not required, and the weight of the parts can be reduced.

本発明によるドラム形部品の製造方法においては、スリーブに予め形成した凹溝と、この凹溝に隣接させて形成した突起部に向けて板材を肉寄せさせ、これら凹溝と突起部に板材をかしめて接合させることとしており、それによって両者の接合が確実なものとなる。さらに、板材をスリーブに確実にかしめることにより、製造した部品、特にスリーブにおける軸方向応力に対する強度を増加させることにもなる。In the method for manufacturing a drum-shaped part according to the present invention, a plate material is brought close to a groove formed in advance in a sleeve and a protrusion formed adjacent to the groove, and a plate material is applied to the groove and the protrusion. It is assumed that they are joined by caulking, whereby the joining of both is ensured. Furthermore, by securely caulking the plate material to the sleeve, the strength against axial stress in the manufactured component, particularly the sleeve, is also increased.

また本発明によるドラム形部品の製造方法においては、スリーブの底部にフランジを設け、スリーブと板材とを接合するために両者を第一の治具上に固定する際、スリーブに設けたフランジ上に板材を載せることにより、スリーブに対して板材を位置決めするようにしている。それによって、両者の寸法誤差を考慮して位置決めが行えることとなり、両者の接合をより確実なものとすることができる。In the method for manufacturing a drum-shaped part according to the present invention, a flange is provided at the bottom of the sleeve, and when the sleeve and the plate are joined to each other on the first jig for joining the sleeve and the plate material, the flange is provided on the flange. By placing the plate material, the plate material is positioned with respect to the sleeve. Accordingly, positioning can be performed in consideration of the dimensional error between the two, and the joining between the two can be made more reliable.

以下、図面を参照して本発明の好適な実施形態について説明する。   Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

図1〜図4は、本発明の一実施形態に係るドラム形部品の製造工程を概略示すものであり、ここでは、例えば遊星歯車機構のリングギヤのような、内歯(スプライン)を設けた部品を製造する場合を示す。   1 to 4 schematically show a manufacturing process of a drum-shaped part according to an embodiment of the present invention. Here, a part provided with internal teeth (splines) such as a ring gear of a planetary gear mechanism, for example. The case of manufacturing is shown.

図1に示すように、ここで製造する部品は、略円筒状のスリーブ1とリング形の板材2を素材とし、後述するように両者を接合した後、ドラム形状に成形すると共に、側面の内側にスプラインを形成する。   As shown in FIG. 1, the parts to be manufactured here are made of a substantially cylindrical sleeve 1 and a ring-shaped plate material 2 and joined to each other as will be described later. Splines are formed in

一方の素材であるスリーブ1は、本体3、フランジ4、本体3に設けた凹溝5および突起部6からなる。凹溝5と突起部6は隣接させて設けており、本体3の板厚t1に対して突起部の板厚t2は大きくしている。また凹溝5底部の板厚t3は突起部の板厚t2よりも薄いことは言うまでもなく、t1と同じか、それよりも薄くする。また、フランジ4の外径は、後述する理由により突起部6の外径よりも大きくする。   The sleeve 1, which is one of the materials, includes a main body 3, a flange 4, a concave groove 5 provided in the main body 3, and a protruding portion 6. The concave groove 5 and the protrusion 6 are provided adjacent to each other, and the plate thickness t2 of the protrusion is larger than the plate thickness t1 of the main body 3. Needless to say, the thickness t3 of the bottom of the concave groove 5 is smaller than the thickness t2 of the protrusion, and is equal to or smaller than t1. Further, the outer diameter of the flange 4 is made larger than the outer diameter of the protrusion 6 for the reason described later.

ドラム形部品の製造に際しては、まず、スリーブ1とリング形の板材2を第一の治具7上に固定する。このとき、板材2をスリーブ1のフランジ4上に載置するようにして、板材2をスリーブ1に対して位置決めを行う。それによって、スリーブ1および板材2のいずれか一方、あるいは双方の寸法誤差を考慮して位置決めが行えることとなり、より確実な接合を実現できる。なお、フランジ4の外径を突起部6の外径よりも大きくするのは、このようにして位置決めを行うためである。次いでマンドレル8をスリーブ1の内部に挿入することにより、これら第一の治具7とマンドレル8とでスリーブ1および板材2を保持する。   In manufacturing the drum-shaped part, first, the sleeve 1 and the ring-shaped plate material 2 are fixed on the first jig 7. At this time, the plate member 2 is placed on the flange 4 of the sleeve 1 so that the plate member 2 is positioned with respect to the sleeve 1. As a result, positioning can be performed in consideration of the dimensional error of either or both of the sleeve 1 and the plate member 2, and more reliable joining can be realized. The reason why the outer diameter of the flange 4 is made larger than the outer diameter of the protrusion 6 is to perform positioning in this way. Next, by inserting the mandrel 8 into the sleeve 1, the sleeve 1 and the plate material 2 are held by the first jig 7 and the mandrel 8.

その後、マンドレル8および第一の治具7を回転させることによりスリーブ1と板材2を回転させ、所定の曲率半径(R形状)を有する第一の成形ローラ9を、所定の角度で板材2に押し付ける。このとき、第一の成形ローラ9を板材2に最初に押し付ける位置Sは、製造するドラム形部品の底部の半径に応じて設定するものとする。すなわち、リング形の板材2の、ドラム形部品の底部となる部分を位置Sから半径方向内側とし、この部分を後述するように第一の成形ローラ9によって加工を行うこととする。   Thereafter, the sleeve 1 and the plate material 2 are rotated by rotating the mandrel 8 and the first jig 7, and the first forming roller 9 having a predetermined radius of curvature (R shape) is formed on the plate material 2 at a predetermined angle. Press. At this time, the position S at which the first forming roller 9 is first pressed against the plate member 2 is set according to the radius of the bottom of the drum-shaped part to be manufactured. That is, the portion of the ring-shaped plate 2 that becomes the bottom of the drum-shaped part is set radially inward from the position S, and this portion is processed by the first forming roller 9 as described later.

そして、図2に示すように、第一の成形ローラ9を回転させてリング形の板材2に押し付けながら矢印の方向、すなわち板材2の半径方向外側から中心方向へ向けて一定の速度で移動させて肉寄せを行う。つまり板材2を部分的に塑性変形させ、その変形によって***した部分の形成を行う。それによって板材2に***部10が形成されると共に、肉寄せを行った後の部分の板厚は、それ以外の部分の板厚よりも薄くなる。つまり、板材2の元の板厚t4よりも、肉寄せを行った後の部分の板厚t5は小さくなる。その結果、製造するドラム形部品の底部の板厚が薄くなることとなる。   Then, as shown in FIG. 2, the first forming roller 9 is rotated and pressed against the ring-shaped plate 2 while moving at a constant speed in the direction of the arrow, that is, from the radially outer side of the plate 2 toward the center. And do meat gathering. That is, the plate member 2 is partially plastically deformed, and a raised portion is formed by the deformation. As a result, the raised portions 10 are formed on the plate material 2, and the plate thickness of the portion after the meat filling is made thinner than the plate thickness of the other portions. That is, the plate thickness t5 of the portion after the meat gathering is smaller than the original plate thickness t4 of the plate material 2. As a result, the thickness of the bottom part of the drum-shaped part to be manufactured becomes thin.

さらに、図3に示すように、第一の成形ローラ9による肉寄せをさらに進め、***部10、すなわちリング形の板材2の肉寄せさせた部分をスリーブ1の凹溝5および突起部6にかしめてスリーブ1とリング形の板材2とを接合する。   Further, as shown in FIG. 3, the first forming roller 9 is further moved closer, and the raised portion 10, that is, the portion where the ring-shaped plate material 2 is moved closer to the recessed groove 5 and the protruding portion 6 of the sleeve 1. The sleeve 1 and the ring-shaped plate material 2 are joined by caulking.

その後、接合したスリーブ1とリング形の板材2を新たに第二の治具11上にセットし、側面にスプライン形12を設けた成形用金型13を上から板材2に押し付け、この成形用金型13と第二の治具11とで板材2を挟む。そして、回転する第二の成形ローラ14によってリング形の板材2を成形用金型13の側面に押し当て、ドラム形状に成形すると共に内面にスプラインを形成する。ここで、第二の成形ローラ14は複数とし、図では2個示している。これにより、リング形の板材2はドラム形部品の底部15および側部16に加工されることとなる。   After that, the joined sleeve 1 and ring-shaped plate material 2 are newly set on the second jig 11, and a molding die 13 provided with a spline shape 12 on the side surface is pressed against the plate material 2 from above. The plate 2 is sandwiched between the mold 13 and the second jig 11. Then, the ring-shaped plate material 2 is pressed against the side surface of the molding die 13 by the rotating second molding roller 14 to form a drum shape and to form a spline on the inner surface. Here, a plurality of second forming rollers 14 are shown, and two are shown in the figure. As a result, the ring-shaped plate material 2 is processed into the bottom portion 15 and the side portion 16 of the drum-shaped part.

リング形の板材2の、第二の成形ローラ14によって成形する部分は、先に行った肉寄せの開始位置Sから半径方向外側の部分、すなわち、肉寄せを行わず元の板厚t4を維持している所である。この部分は第二の成形ローラ14で成形し、またここでは内面にスプラインを形成することから、板厚t4の値はこれらを成形するのに必要なだけの設計上のもので良い。換言すれば、リング形の板材2の元の厚さであるt4の値を必要以上に大きくしなくても良いこととなる。   The portion of the ring-shaped plate 2 that is formed by the second forming roller 14 is a portion radially outward from the start position S of the previously performed meat gathering, that is, the original sheet thickness t4 is maintained without performing the meat gathering. This is where you are. Since this portion is formed by the second forming roller 14 and a spline is formed here on the inner surface, the value of the plate thickness t4 may be as much as necessary for forming these. In other words, it is not necessary to increase the value of t4, which is the original thickness of the ring-shaped plate material 2, more than necessary.

以上説明したように、本発明によるドラム形部品の製造方法は、部品を構成する素材同士の接合を確実にすると共に、素材を成形した後の二次加工を必要とせず、さらには部品の軽量化を図ることが可能である。   As described above, the method for manufacturing a drum-shaped part according to the present invention ensures the joining of the materials constituting the parts, does not require secondary processing after forming the materials, and further reduces the weight of the parts. Can be achieved.

なお、本発明は上述した実施形態に限定されるものではなく、ドラム形状を有する他の部品、例えばクラッチドラムのように内面にスプラインを形成しない部品への適用も可能である。   In addition, this invention is not limited to embodiment mentioned above, The application to the components which do not form a spline on an inner surface like a drum drum, for example, other components which have a drum shape, is also possible.

本発明によるドラム形部品の製造工程を概略示す図であり、素材であるスリーブとリング形の板材を第一の治具上に取り付けた状態を示すものである。It is a figure which shows schematically the manufacturing process of the drum-shaped components by this invention, and shows the state which attached the sleeve which is a raw material, and a ring-shaped board | plate material on the 1st jig | tool. 本発明によるドラム形部品の製造工程を概略示す図であり、リング形の板材の肉寄せを行っている状態を示すものである。It is a figure which shows schematically the manufacturing process of the drum-shaped components by this invention, and shows the state which is carrying out the meat gathering of the ring-shaped board | plate material. 本発明によるドラム形部品の製造工程を概略示す図であり、リング形の板材をスリーブにかしめた状態を示すものである。It is a figure which shows schematically the manufacturing process of the drum-shaped components by this invention, and shows the state which crimped the ring-shaped board | plate material to the sleeve. 本発明によるドラム形部品の製造工程を概略示す図であり、成形用金型により成形加工を行っている状態を示すものである。It is a figure which shows schematically the manufacturing process of the drum-shaped components by this invention, and shows the state which is shape | molding with the metal mold | die for shaping | molding.

符号の説明Explanation of symbols

1 スリーブ
2 板材
3 スリーブ1の本体
4 スリーブ1のフランジ
5 スリーブ1の凹溝
6 スリーブ1の突起部
7 第一の治具
8 マンドレル
9 第一の成形ローラ
10 板材2の***部
11 第二の治具
12 成形用金型13のスプライン形
13 成形用金型
14 第二の成形ローラ
15 ドラム形部品の底部
16 ドラム形部品の側部
1 sleeve
2 Board material
3 Body of sleeve 1
4 Flange of sleeve 1
5 Groove in sleeve 1
6 Projection of sleeve 1
7 First jig
8 Mandrels
9 First forming roller
10 Raised part of plate 2
11 Second jig
12 Spline type of molding die 13
13 Mold for molding
14 Second forming roller
15 Bottom of drum-shaped part
16 Sides of drum-shaped parts

Claims (3)

略円筒形のスリーブとリング形の板材とを接合し、次いでこれを成形することによりドラム形状を有する部品を製造する方法であって、
前記スリーブの外面に周方向に凹溝を形成する工程と、
前記凹溝と前記板材の内側端部とが半径方向に対向するように、第一の治具上に前記スリーブおよび前記板材を固定する工程と、
第一の成形ローラにより前記板材を半径方向外側から中心部に向けて肉寄せして当該板材を前記凹溝で前記スリーブと接合させる工程と、
第二の治具および成形用金型との間に前記接合した前記スリーブと前記板材を固定し、第二の成形ローラにより前記板材を前記成形用金型に押し付けてドラム形状に成形する工程と、
を具え
前記板材に対しその半径方向の所定位置から前記肉寄せを行い、当該肉寄せを開始する位置から半径方向内側の部分を部品底部とし、半径方向外側の部分を前記第二の成形ローラにより前記成形用金型に押し付けてドラム形状に成形することを特徴とするドラム形部品の製造方法。
A method of manufacturing a part having a drum shape by joining a substantially cylindrical sleeve and a ring-shaped plate, and then molding the same,
Forming a groove in the circumferential direction on the outer surface of the sleeve;
Fixing the sleeve and the plate on the first jig so that the concave groove and the inner end of the plate are opposed to each other in the radial direction ;
A step of bringing the plate material from the radially outer side toward the center by a first forming roller and joining the plate material to the sleeve through the concave groove;
Fixing the joined sleeve and the plate material between a second jig and a molding die, and pressing the plate material against the molding die by a second molding roller to form a drum shape; ,
The equipped,
The fleshing is performed on the plate material from a predetermined position in the radial direction, the radially inner portion from the position at which the fleshing starts is used as a component bottom, and the radially outer portion is formed by the second forming roller. A method for producing a drum-shaped part, wherein the drum-shaped part is molded by pressing against a metal mold .
請求項1記載の方法において、
前記スリーブの前記凹溝に隣接させて該スリーブの半径方向に突出する突起部を形成し、前記板材を肉寄せさせて前記突起部および凹溝に当該板材をかしめることにより、前記スリーブと前記板材とを接合することを特徴とするドラム形部品の製造方法。
The method of claim 1, wherein
Protruding portions projecting in the radial direction of the sleeve are formed adjacent to the concave grooves of the sleeve, and the plate material is brought closer together and the plate material is caulked in the protruding portions and the concave grooves, whereby the sleeve and the A method for manufacturing a drum-shaped part, characterized by joining plate materials.
請求項1または2記載の方法において、
前記スリーブの底部にフランジを設け、
前記第一の治具上に前記スリーブおよび前記板材を固定する際、前記スリーブのフランジ上に前記板材を載置することにより、前記スリーブに対して前記板材を位置決めすることを特徴とするドラム形部品の製造方法。
The method according to claim 1 or 2, wherein
A flange is provided at the bottom of the sleeve,
When fixing the sleeve and the plate on the first jig, the plate is positioned on a flange of the sleeve, thereby positioning the plate with respect to the sleeve. Manufacturing method of parts.
JP2004202973A 2004-07-09 2004-07-09 Method for manufacturing drum-shaped parts Expired - Fee Related JP4257742B2 (en)

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JP4257742B2 true JP4257742B2 (en) 2009-04-22

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