JP5193154B2

JP5193154B2 - Spinning method

Info

Publication number: JP5193154B2
Application number: JP2009234520A
Authority: JP
Inventors: 恒哉二木; 信行垣矢; 忠久秋山; 育男加藤; 明敏内海
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2009-07-15
Filing date: 2009-10-08
Publication date: 2013-05-08
Anticipated expiration: 2029-10-08
Also published as: JP2011036912A

Description

本発明は、円筒状ワークの側壁部に、該円筒状ワークの径方向内側に沿って陥没する凹部を形成するスピニング加工方法に関する。 The present invention relates to a spinning method for forming a recess recessed in a side wall portion of a cylindrical workpiece along a radially inner side of the cylindrical workpiece.

従来から、自動車等の車両用タイヤが嵌着されるホイールとして、板状の素材から略円筒状に形成されたホイールリム（以下、単にリムともいう）と、略円盤状に形成されたホイールディスク（以下、単にディスクともいう）とを組み合わせ、溶接により接合した２ピースホイールが広く用いられている。 Conventionally, as a wheel on which a tire for a vehicle such as an automobile is fitted, a wheel rim (hereinafter also simply referred to as a rim) formed from a plate-shaped material and a wheel disk formed in a substantially disc shape. (Hereinafter, also simply referred to as a disk) and two-piece wheels joined by welding are widely used.

このうち、リムは、例えば、以下のようにして製作される。先ず、長方形状の板材の端面同士を当接させて円筒体（円筒状ワーク）とし、次に、この当接した端面同士を抵抗溶接や摩擦撹拌接合等で接合する。次に、この円筒体を所定の凹部が形成された金型に保持した後、その側壁部に対してスピニング加工を施す。これにより、該側壁部にドロップ部と呼称される凹部を円周方向に沿って陥没形成する。場合によっては、該円筒体の端部を折曲してカール部を設ける。 Among these, a rim is manufactured as follows, for example. First, end surfaces of rectangular plate materials are brought into contact with each other to form a cylindrical body (cylindrical workpiece), and then the contacted end surfaces are joined by resistance welding, friction stir welding, or the like. Next, after this cylindrical body is held in a mold in which a predetermined recess is formed, a spinning process is performed on the side wall portion. As a result, a concave portion called a drop portion is formed in the side wall portion so as to be depressed along the circumferential direction. In some cases, the end of the cylindrical body is bent to provide a curled portion.

ホイールは、このようにして得られたリムの内部に前記ディスクを挿入し、両者をＭＩＧ溶接やスポット溶接によって接合することによって得ることができる。 The wheel can be obtained by inserting the disk into the rim thus obtained and joining them together by MIG welding or spot welding.

ここで、前記スピニング加工を実施する際には、円筒体の両端部がクランプされる。例えば、特許文献１記載の従来技術では、１組のプレートで円筒体を挟持し、この状態で、円筒体の側壁部をローラ型で押圧するようにしている。そして、この押圧に伴い、押圧された円筒体の肉が延伸する。すなわち、いわゆるしごき成形が進行する。 Here, when carrying out the spinning process, both ends of the cylindrical body are clamped. For example, in the prior art described in Patent Document 1, a cylindrical body is sandwiched between a pair of plates, and in this state, the side wall of the cylindrical body is pressed with a roller mold. And with this press, the pressed cylindrical body is stretched. That is, so-called ironing progresses.

特開２０００−２８８６６９号公報JP 2000-288669 A

特許文献１に記載されるように円筒体の両端部をクランプする場合、各端部をそれぞれクランプするために複数個のクランプ機構が必要となる。このため、成形加工装置の構成が複雑となり、設備投資も高騰する。 When clamping both ends of a cylindrical body as described in Patent Document 1, a plurality of clamping mechanisms are required to clamp each end. For this reason, the configuration of the molding apparatus becomes complicated and the capital investment increases.

しかも、クランプした箇所には成形を施すことができないため、成形に対する自由度が低い。このため、複雑な形状の成形品を得ることが困難である。 In addition, since the clamped portion cannot be molded, the degree of freedom for molding is low. For this reason, it is difficult to obtain a molded product having a complicated shape.

本発明は上記した問題を解決するためになされたもので、クランプ機構の個数が低減し、このために成形加工装置の構成を簡素化し得、しかも、成形に対する自由度を向上させることが可能なスピニング加工方法を提供することを目的とする。 The present invention has been made to solve the above-described problems, and the number of clamp mechanisms can be reduced. For this reason, the configuration of the molding apparatus can be simplified, and the degree of freedom in molding can be improved. An object is to provide a spinning method.

前記の目的を達成するために、本発明は、円筒状ワークの側壁部にローラ型を当接させることで該円筒状ワークの径方向に沿って陥没する凹部を形成するスピニング加工方法であって、
直径が一定であり且つ互いに離間した第１等径部及び第２等径部と、前記第１等径部に連なり且つ該第１等径部から離間するに従ってテーパ状に縮径する第１傾斜部と、前記第２等径部に接近するに従ってテーパ状に拡径し且つ該第２等径部に連なる第２傾斜部と、前記第１傾斜部と前記第２傾斜部との間に介在して径が一定である加工部とを有するとともに、前記円筒状ワークが前記第１傾斜部から前記第２傾斜部に向かって移動することを妨げるワーク移動防止手段が設けられた金型に前記円筒状ワークを装着する装着工程と、
前記ローラ型を前記円筒状ワークにおける前記第１傾斜部に対応する部位に押接して該第１傾斜部から前記第２傾斜部側へ変位させることで、該部位を前記第１傾斜部の形状に倣って成形する第１成形工程と、
前記ローラ型を前記円筒状ワークにおける前記第２傾斜部に対応する部位に押接して該第２傾斜部から前記第１傾斜部側へ変位させることで、該部位を前記第２傾斜部の形状に倣って成形する第２成形工程と、
前記ローラ型を前記円筒状ワークにおける前記加工部に対応する部位に押接して変位させることで、該部位を前記加工部の形状に倣って成形するとともに、該部位の肉を、前記ローラ型でしごくことで延伸させる第３成形工程と、
を有し、前記第１成形工程、前記第２成形工程及び前記第３成形工程中では前記第１成形工程を最初に行い、
前記円筒状ワークに、前記第１等径部に対応する第１一定径部、前記第１傾斜部の形状に対応する形状のテーパ状縮径部、前記加工部の形状に対応する形状の凹部、前記第２傾斜部の形状に対応する形状のテーパ状拡径部、前記第２等径部に対応する第２一定径部を形成することを特徴とする。 In order to achieve the above object, the present invention is a spinning method for forming a recess recessed along the radial direction of a cylindrical workpiece by bringing a roller mold into contact with a side wall portion of the cylindrical workpiece. ,
A first constant diameter portion and a second constant diameter portion that have a constant diameter and are spaced apart from each other, and a first slope that is continuous with the first constant diameter portion and decreases in a tapered shape as the distance from the first constant diameter portion increases A second inclined portion that expands in a tapered shape as it approaches the second equal-diameter portion and is continuous with the second equal-diameter portion, and is interposed between the first inclined portion and the second inclined portion. And a machining part having a constant diameter, and a mold provided with a workpiece movement preventing means for preventing the cylindrical workpiece from moving from the first inclined part toward the second inclined part. A mounting process for mounting a cylindrical workpiece;
The roller mold is pressed against a portion corresponding to the first inclined portion in the cylindrical workpiece and is displaced from the first inclined portion toward the second inclined portion, whereby the portion is shaped as the first inclined portion. A first molding step for molding in accordance with
The roller mold is pressed against a portion corresponding to the second inclined portion of the cylindrical workpiece and displaced from the second inclined portion toward the first inclined portion, thereby forming the portion into the shape of the second inclined portion. A second molding step for molding in accordance with
By pressing and displacing the roller mold against a portion corresponding to the processed portion in the cylindrical workpiece, the portion is molded following the shape of the processed portion, and the meat of the portion is formed by the roller mold. A third molding step of stretching by squeezing;
In the first molding step, the second molding step and the third molding step, the first molding step is performed first,
The cylindrical workpiece has a first constant diameter portion corresponding to the first equal diameter portion, a tapered reduced diameter portion having a shape corresponding to the shape of the first inclined portion, and a concave portion having a shape corresponding to the shape of the processing portion. A tapered enlarged diameter portion having a shape corresponding to the shape of the second inclined portion and a second constant diameter portion corresponding to the second equal diameter portion are formed.

すなわち、本発明においては、円筒状ワークにおけるクランプされていない端部側（第１等径部側）に近接する第１傾斜部に対応する部位を最初に成形し、その後、第２傾斜部に対応する部位、加工部に対応する部位を順不同で成形するようにしている。必要に応じ、さらに、第１傾斜部に対応する部位の肉を延伸させることもある。 That is, in the present invention, a portion corresponding to the first inclined portion close to the unclamped end portion side (first equal diameter portion side) of the cylindrical workpiece is first formed, and then the second inclined portion is formed. The corresponding parts and the parts corresponding to the processed parts are formed in any order. If necessary, the meat corresponding to the first inclined portion may be stretched.

第１傾斜部に対応する部位の成形に際しては、円筒状ワークが、ワーク移動防止手段が設けられた端部側（第２等径部側）に向かって押圧されるので、該円筒状ワークが移動すること、換言すれば、金型に対して位置ズレを起こすことがない。また、円筒状ワークが空転することも防止される。 In forming the portion corresponding to the first inclined portion, the cylindrical workpiece is pressed toward the end portion side (second equal diameter portion side) provided with the workpiece movement prevention means. It moves, in other words, there is no position shift with respect to the mold. Also, the cylindrical workpiece is prevented from idling.

また、最小径である加工部に対応する部位の肉が該加工部の形状に倣って成形されることにより、この成形された部位が加工部に嵌合する。その結果、円筒状ワークが堅牢に位置決め固定される。 Further, the portion of the meat corresponding to the processing portion having the minimum diameter is formed following the shape of the processing portion, so that the formed portion fits into the processing portion. As a result, the cylindrical workpiece is firmly positioned and fixed.

その後、必要に応じ、円筒状ワークの前記第１傾斜部に対応する部位の肉が第１等径部側に向かって延伸される。上記したように、円筒状ワークが既に堅牢に位置決め固定されているので、この際にも、円筒状ワークが金型に対して位置ズレを起こすことが回避される。 Thereafter, if necessary, the meat of the portion corresponding to the first inclined portion of the cylindrical workpiece is stretched toward the first equal-diameter portion. As described above, since the cylindrical workpiece is already firmly positioned and fixed, it is possible to prevent the cylindrical workpiece from being displaced relative to the mold.

以上から諒解されるように、本発明によれば、円筒状ワーク自体がクランプとして機能する。このためにクランプ機構の個数を低減することができるので、前記金型を含む成形加工装置の構成の簡素化を図ることができる。 As can be understood from the above, according to the present invention, the cylindrical workpiece itself functions as a clamp. For this reason, since the number of clamp mechanisms can be reduced, the configuration of the molding apparatus including the mold can be simplified.

また、円筒状ワークの少なくとも一端部をクランプする必要がないので、この一端部に対する成形の自由度が増す。従って、一層複雑な形状の成形品を得ることが可能となる。 Further, since it is not necessary to clamp at least one end portion of the cylindrical workpiece, the degree of freedom in forming the one end portion is increased. Therefore, it is possible to obtain a molded product having a more complicated shape.

なお、ワーク移動防止手段の好適な一例としては、クランプ機構を挙げることができる。すなわち、この場合、該クランプ機構によって前記円筒状ワークの第２等径部側の一端部のみをクランプすればよい。 A preferred example of the workpiece movement preventing means is a clamping mechanism. That is, in this case, it is only necessary to clamp only one end of the cylindrical workpiece on the second constant diameter side by the clamping mechanism.

また、金型としては、前記第１傾斜部と前記加工部との間、及び前記加工部と前記第２傾斜部との間に、それぞれ、前記第１傾斜部及び前記第２傾斜部に比してテーパ角度が大きな第１テーパ部、第２テーパ部を有するものを用いることが好ましい。 Further, as the mold, the first inclined portion and the second inclined portion are respectively compared between the first inclined portion and the processed portion and between the processed portion and the second inclined portion. Thus, it is preferable to use one having a first taper portion and a second taper portion having a large taper angle.

この場合、前記円筒状ワークにおける前記第１テーパ部に対応する部位に、前記テーパ状縮径部に比してテーパ角度が大きなテーパ状大縮径部を形成するとともに、前記円筒状ワークにおける前記第２テーパ部に対応する部位に、前記テーパ状拡径部に比してテーパ角度が大きなテーパ状大拡径部を形成する。これにより、前記テーパ状縮径部から前記凹部に至るまでを段階的に陥没させ、且つ前記凹部から前記テーパ状拡径部に至るまでを段階的に隆起させることができる。すなわち、いわゆるギャップ量を徐々に変化させることができるので、テーパ状縮径部、凹部及びテーパ状拡径部を直接連ねる場合に比して肉を延伸させることが容易となる。このため、これらの部位の肉厚を揃えることも容易となる。 In this case, a tapered large-diameter portion having a larger taper angle than the tapered reduced-diameter portion is formed in a portion corresponding to the first tapered portion in the cylindrical workpiece, and the cylindrical workpiece is A tapered large-diameter portion having a larger taper angle than the tapered large-diameter portion is formed at a portion corresponding to the second tapered portion. Thereby, it can be made to step down from the said taper-shaped diameter-reduced part to the said recessed part in steps, and can be raised in steps from the said recessed part to the said taper-shaped enlarged diameter part. That is, since the so-called gap amount can be gradually changed, it becomes easier to stretch the meat as compared with the case where the tapered diameter-reduced portion, the concave portion and the tapered diameter-expanded portion are directly connected. For this reason, it becomes easy to equalize the thickness of these parts.

以上のスピニング加工方法において得られる成形品の好適な例としては、ホイールリムを挙げることができる。 A wheel rim can be mentioned as a suitable example of the molded product obtained by the above spinning method.

本発明においては、第１等径部、第１傾斜部、加工部、第２傾斜部及び第２等径部を具備する金型を用い、該金型に支持された円筒状ワークにおけるクランプされていない第１等径部側に近接する第１傾斜部に対応する部位を最初に成形した後、第２傾斜部に対応する部位、加工部に対応する部位をこの順序で成形し、さらに、第１傾斜部に対応する部位の肉を延伸させるようにしている。最後の延伸過程では、加工部に倣って成形された部位が加工部に嵌合しているので、円筒状ワークが堅牢に位置決め固定される。すなわち、円筒状ワーク自体がクランプとしての役割を果たす。 In the present invention, a mold having a first equal-diameter portion, a first inclined portion, a processing portion, a second inclined portion, and a second equal-diameter portion is used, and the cylindrical workpiece supported by the die is clamped. After first forming the portion corresponding to the first inclined portion that is not close to the first equal diameter portion side, the portion corresponding to the second inclined portion, the portion corresponding to the processed portion is formed in this order, The meat of the part corresponding to the first inclined part is stretched. In the final drawing process, the portion formed following the processed portion is fitted to the processed portion, so that the cylindrical workpiece is firmly positioned and fixed. That is, the cylindrical workpiece itself serves as a clamp.

従って、本発明によれば、第１等径部及び第２等径部の双方をクランプする必要がないので、前記金型を含む成形加工装置の構成を簡素化することができる。 Therefore, according to the present invention, since it is not necessary to clamp both the first and second equal diameter portions, the configuration of the molding apparatus including the mold can be simplified.

また、円筒状ワークにおけるクランプされていない一端部に対する成形の自由度が増す。従って、一層複雑な形状の成形品を得ることが可能となる。 Moreover, the freedom degree of shaping | molding with respect to the one end part which is not clamped in a cylindrical workpiece | work increases. Therefore, it is possible to obtain a molded product having a more complicated shape.

本実施の形態に係るスピニング加工方法を実施するための成形加工装置を構成する金型の全体概略一部断面側面図である。1 is an overall schematic partial cross-sectional side view of an entire mold that constitutes a molding apparatus for carrying out a spinning method according to the present embodiment. 図１からローラ型を変位させ、円筒体（円筒状ワーク）における第１傾斜部に対応する部位に対して成形を開始した状態を示す全体概略一部断面側面図である。FIG. 2 is an overall schematic partial cross-sectional side view showing a state in which a roller mold is displaced from FIG. 1 and molding is started for a portion corresponding to a first inclined portion in a cylindrical body (cylindrical workpiece). 前記円筒体におけるクランプされた端部側に向かって前記ローラ型をさらに変位させた状態を示す全体概略一部断面側面図である。It is a whole schematic partial cross section side view which shows the state which further displaced the said roller type | mold toward the clamped edge part side in the said cylindrical body. 前記ローラ型を図３の位置から戻し、前記円筒体における加工部に対応する部位に対して成形を施している状態を示す全体概略一部断面側面図である。FIG. 4 is an overall schematic partial cross-sectional side view showing a state in which the roller mold is returned from the position of FIG. 3 and molding is performed on a portion corresponding to a processed portion in the cylindrical body. 前記ローラ型を図４の位置からさらに戻し、前記円筒体における前記第１傾斜部に倣って成形された部位に対してしごき成形を施している状態を示す全体概略一部断面側面図である。FIG. 5 is an overall schematic partial cross-sectional side view showing a state in which the roller mold is further returned from the position of FIG. 4 and ironing is performed on a portion of the cylindrical body that is molded following the first inclined portion.

以下、本発明に係るスピニング加工方法につき好適な実施の形態を挙げ、添付の図面を参照して詳細に説明する。 Hereinafter, preferred embodiments of the spinning method according to the present invention will be described in detail with reference to the accompanying drawings.

図１は、円筒状ワークである円筒体１０に対して本実施の形態に係るスピニング加工方法を実施し、これによりリム１２（図５参照）を得るための成形加工装置を構成する金型１４の全体概略一部断面側面図である。この金型１４は、左マンドレル１６と右マンドレル１８とが組み合わされて構成される。 FIG. 1 shows a mold 14 constituting a forming apparatus for carrying out a spinning method according to the present embodiment on a cylindrical body 10 which is a cylindrical workpiece, thereby obtaining a rim 12 (see FIG. 5). It is the whole general | schematic partial cross section side view. The mold 14 is configured by combining a left mandrel 16 and a right mandrel 18.

左マンドレル１６には、円筒体１０を堰止するための円盤形状の左堰止板２０が設けられる。勿論、この左堰止板２０の直径は、円筒体１０よりも大径に設定される。 The left mandrel 16 is provided with a disc-shaped left damming plate 20 for damming the cylindrical body 10. Of course, the diameter of the left weir plate 20 is set to be larger than that of the cylindrical body 10.

この場合、左マンドレル１６には、直径が一定である第１等径部２４と、該第１等径部２４に連なり且つ径方向内側に向かってテーパ状に縮径する第１傾斜部２６と、該第１傾斜部２６に連なりさらに大きなテーパ角度でテーパ状に縮径する第１テーパ部２８と、該第１テーパ部２８に連なり且つ直径が一定である第１小径部３０とが図１における左方からこの順序で形成される。 In this case, the left mandrel 16 includes a first constant-diameter portion 24 having a constant diameter, and a first inclined portion 26 that is continuous with the first constant-diameter portion 24 and decreases in a taper shape toward the radially inner side. FIG. 1 shows a first tapered portion 28 that is continuous with the first inclined portion 26 and has a tapered diameter reduced at a larger taper angle, and a first small-diameter portion 30 that is continuous with the first tapered portion 28 and has a constant diameter. Are formed in this order from the left.

図１から容易に諒解されるように、第１小径部３０は第１等径部２４よりも小径である。また、第１傾斜部２６のテーパ角度θ１と第１テーパ部２８のテーパ角度θ２との関係は、θ１＜θ２である。 As can be easily understood from FIG. 1, the first small-diameter portion 30 has a smaller diameter than the first constant-diameter portion 24. Further, the relationship between the taper angle θ1 of the first inclined portion 26 and the taper angle θ2 of the first taper portion 28 is θ1 <θ2.

一方の右マンドレル１８には、前記第１小径部３０と同径の第２小径部３２と、該第２小径部３２に連なり径方向内側に向かって角度θ３でテーパ状に拡径する第２テーパ部３４と、該第２テーパ部３４に連なり且つテーパ角度θ４が該第２テーパ部３４の角度θ３に比して小さな第２傾斜部３６と、該第２傾斜部３６に連なり且つ直径が一定である第２等径部３８とが図１における左方からこの順序で形成される。 One right mandrel 18 has a second small-diameter portion 32 having the same diameter as the first small-diameter portion 30, a second small-diameter portion 32 that is continuous with the second small-diameter portion 32, and expands in a taper shape at an angle θ 3 toward the radially inner side. The tapered portion 34, the second tapered portion 34, and the taper angle θ4 is smaller than the angle θ3 of the second tapered portion 34. The second inclined portion 36 is continuous with the second inclined portion 36 and has a diameter. A constant second constant diameter portion 38 is formed in this order from the left in FIG.

すなわち、本実施の形態において用いられる金型１４には、図１における左方から順に、第１等径部２４、第１傾斜部２６、第１テーパ部２８、第１小径部３０と第２小径部３２が連なって形成される加工部４０、第２テーパ部３４、第２傾斜部３６、第２等径部３８が存在する。 That is, the metal mold 14 used in the present embodiment includes, in order from the left in FIG. 1, the first constant diameter portion 24, the first inclined portion 26, the first tapered portion 28, the first small diameter portion 30, and the second. There are a processing portion 40, a second taper portion 34, a second inclined portion 36, and a second constant-diameter portion 38 formed by connecting the small-diameter portions 32 in series.

この場合、第２等径部３８は第１等径部２４と同径である。また、これら第１等径部２４及び第２等径部３８の直径は、円筒体１０の内径に略等しい。 In this case, the second equal diameter portion 38 has the same diameter as the first equal diameter portion 24. Further, the diameters of the first equal diameter portion 24 and the second equal diameter portion 38 are substantially equal to the inner diameter of the cylindrical body 10.

一方、第１テーパ部２８のテーパ角度θ２と第２テーパ部３４のテーパ角度θ３は互いに等しくてもよく、異なっていてもよい。同様に、第１傾斜部２６のテーパ角度θ１と第２傾斜部３６のテーパ角度θ４も、互いに等しくてもよく、異なっていてもよい。 On the other hand, the taper angle θ2 of the first taper portion 28 and the taper angle θ3 of the second taper portion 34 may be equal to or different from each other. Similarly, the taper angle θ1 of the first inclined portion 26 and the taper angle θ4 of the second inclined portion 36 may be equal to or different from each other.

右マンドレル１８には、しごき成形によって延伸する円筒体１０を堰止するための円盤形状の右堰止板４２が設けられる。この右堰止板４２の直径は、前記左堰止板２０と同様に、円筒体１０よりも大径に設定される。 The right mandrel 18 is provided with a disk-shaped right damming plate 42 for damming the cylindrical body 10 extending by ironing. The diameter of the right dam plate 42 is set to be larger than that of the cylindrical body 10, similarly to the left dam plate 20.

右堰止板４２には、円筒体１０が金型１４の軸線方向に沿って移動することを防止するためのクランプ機構（ワーク移動防止手段）を構成する複数個のクランプ爪４４が環状に配置され、且つ開閉自在に設けられる。なお、図１においては、その中の２個が示されている。 A plurality of clamp claws 44 constituting a clamp mechanism (work movement preventing means) for preventing the cylindrical body 10 from moving along the axial direction of the mold 14 are annularly arranged on the right dam plate 42. And can be freely opened and closed. In FIG. 1, two of them are shown.

以上のように構成された金型１４は、成形加工装置を構成する図示しない回転機構の作用下に、その中心軸を回転中心として回転可能である。 The mold 14 configured as described above can rotate about its central axis as a rotation center under the action of a rotation mechanism (not shown) constituting the molding apparatus.

成形加工装置は、さらに、金型１４の側壁部に対して接近・離間自在なローラ型４６を具備する。このローラ型４６は、図示しない変位機構の作用下に、金型１４の長手方向に沿って変位することも可能である。後述するように、このローラ型４６が円筒体１０を金型１４側に押圧しながら円筒体１０の長手方向に沿って変位することにより、スピニング加工が行われる。 The molding apparatus further includes a roller mold 46 that can be moved toward and away from the side wall of the mold 14. The roller mold 46 can be displaced along the longitudinal direction of the mold 14 under the action of a displacement mechanism (not shown). As will be described later, spinning is performed by the roller mold 46 being displaced along the longitudinal direction of the cylindrical body 10 while pressing the cylindrical body 10 toward the mold 14.

本実施の形態に係るスピニング加工方法は、上記のように構成された金型１４及びローラ型４６を具備する成形加工装置を用い、以下のようにして実施される。 The spinning processing method according to the present embodiment is carried out as follows using a molding processing apparatus including the mold 14 and the roller mold 46 configured as described above.

はじめに、例えば、軽合金や鉄等からなる長方形状の板材を湾曲させて端面同士を当接させ、さらに、突き合わされた端面同士を抵抗溶接や摩擦撹拌接合等で接合することにより、円筒体１０とする。 First, for example, by bending a rectangular plate made of a light alloy, iron, or the like, the end faces are brought into contact with each other, and the joined end faces are joined together by resistance welding, friction stir welding, or the like, so that the cylindrical body 10 And

このようにして形成された円筒体１０の図１における右端面を、右堰止板４２の端面に当接させる。そして、クランプ機構を構成するクランプ爪４４を閉じ、これにより円筒体１０の右端部のみをクランプする。なお、図１に示す破線は円筒体１０の左端面の位置を示し、以下の図面においても同様である。この時点では、円筒体１０の左端面は、第１等径部２４に差し掛かる程度である。 The right end surface in FIG. 1 of the cylindrical body 10 formed in this manner is brought into contact with the end surface of the right blocking plate 42. And the clamp nail | claw 44 which comprises a clamp mechanism is closed, and only the right end part of the cylindrical body 10 is clamped by this. 1 indicates the position of the left end surface of the cylindrical body 10, and the same applies to the following drawings. At this time, the left end surface of the cylindrical body 10 is about to reach the first constant diameter portion 24.

この状態で、円筒体１０における第１傾斜部２６に略対応する部位に前記ローラ型４６を押接させる。その後、前記回転機構の作用下に金型１４及び円筒体１０を回転動作させる。 In this state, the roller mold 46 is pressed against a portion of the cylindrical body 10 substantially corresponding to the first inclined portion 26. Thereafter, the mold 14 and the cylindrical body 10 are rotated under the action of the rotation mechanism.

次に、ローラ型４６を加工部４０側に指向して変位させる。この際、円筒体１０が第１傾斜部２６の形状に倣って変形し、その結果、図２に示すように、該円筒体１０に、第１傾斜部２６の形状に対応する形状のテーパ状縮径部５０が形成され始める。 Next, the roller mold 46 is displaced toward the processing unit 40 side. At this time, the cylindrical body 10 is deformed following the shape of the first inclined portion 26, and as a result, as shown in FIG. 2, the cylindrical body 10 has a tapered shape corresponding to the shape of the first inclined portion 26. The reduced diameter portion 50 begins to be formed.

ここで、円筒体１０は、ローラ型４６が加工部４０側に向かって変位することに伴い、第２等径部３８側に指向して押圧される。しかしながら、円筒体１０における第２等径部３８側の端部は、上記したように、クランプ爪４４によってクランプされるとともに、右堰止板４２によって堰止される。このため、円筒体１０が金型１４に対して位置ズレを起こすことが回避される。 Here, the cylindrical body 10 is pressed toward the second constant diameter portion 38 side as the roller mold 46 is displaced toward the processing portion 40 side. However, the end of the cylindrical body 10 on the second constant diameter portion 38 side is clamped by the clamp pawl 44 and blocked by the right blocking plate 42 as described above. For this reason, it is avoided that the cylindrical body 10 raise | generates position shift with respect to the metal mold | die 14. FIG.

また、クランプされ且つ右堰止板４２によって堰止された円筒体１０においては、金型１４の円周方向に沿って回転すること、換言すれば、空転が起こることがない。 Further, the cylindrical body 10 clamped and blocked by the right blocking plate 42 rotates along the circumferential direction of the mold 14, in other words, idling does not occur.

ローラ型４６は、第１テーパ部２８、加工部４０、第２テーパ部３４を越え、第２傾斜部３６と第２等径部３８との境界近傍に到達する。必要に応じ、円筒体１０における第２等径部３８に対応する部位にローラ型４６を乗り上げさせ、クランプ爪４４の近傍に到達させるようにしてもよい。このようにして、円筒体１０に、第２等径部３８に対応する第２一定径部６０が形成される。 The roller mold 46 reaches the vicinity of the boundary between the second inclined portion 36 and the second equal-diameter portion 38 beyond the first tapered portion 28, the processed portion 40, and the second tapered portion 34. If necessary, the roller mold 46 may be mounted on a portion of the cylindrical body 10 corresponding to the second equal diameter portion 38 so as to reach the vicinity of the clamp pawl 44. In this way, the second constant diameter portion 60 corresponding to the second constant diameter portion 38 is formed in the cylindrical body 10.

その後、ローラ型４６は、図３に示すように、円筒体１０における第２傾斜部３６に対応する部位上を往復動作し、これにより該部位を第２傾斜部３６の形状に倣って成形する。この際には、該部位の肉が延伸する。すなわち、本実施の形態では、この部位が金型１４の第２傾斜部３６の形状に倣って成形されるとともに、該部位に対し、薄肉化を伴うしごきが施される。その結果、円筒体１０にテーパ状拡径部４８が適切な肉厚で形成される。 Thereafter, as shown in FIG. 3, the roller mold 46 reciprocates on a portion of the cylindrical body 10 corresponding to the second inclined portion 36, thereby forming the portion following the shape of the second inclined portion 36. . At this time, the meat of the part is stretched. That is, in the present embodiment, this portion is formed following the shape of the second inclined portion 36 of the mold 14 and ironing accompanied by thinning is applied to the portion. As a result, the tapered enlarged diameter portion 48 is formed in the cylindrical body 10 with an appropriate thickness.

図１〜図３に示すように、円筒体１０の左端部はクランプされていない。換言すれば、左端部は、いわゆる自由端である。従って、上記の延伸が進行する場合、円筒体１０は、その右端部側の肉が左端部に引き寄せられながら薄肉化される。この際、クランプ爪４４によるクランプ作用下に、円筒体１０が左端部側に向かって移動することが回避される。換言すれば、円筒体１０が位置ズレを起こすことが防止される。同時に、円筒体１０が空転することが有効に防止される。 As shown in FIGS. 1-3, the left end part of the cylindrical body 10 is not clamped. In other words, the left end is a so-called free end. Therefore, when the above-described stretching proceeds, the cylindrical body 10 is thinned while the right end portion side meat is drawn toward the left end portion. At this time, it is avoided that the cylindrical body 10 moves toward the left end side under the clamping action by the clamping claws 44. In other words, the cylindrical body 10 is prevented from being displaced. At the same time, the cylindrical body 10 is effectively prevented from idling.

次に、ローラ型４６は、第２テーパ部３４を通過した後、図４に示すように、円筒体１０における加工部４０に対応する部位に到達する。この通過に伴い、円筒体１０に、該第２テーパ部３４のテーパ角度に対応するテーパ角度のテーパ状大拡径部５４が形成される。 Next, after passing the 2nd taper part 34, the roller type | mold 46 reaches | attains the site | part corresponding to the process part 40 in the cylindrical body 10, as shown in FIG. With this passage, a tapered large-diameter portion 54 having a taper angle corresponding to the taper angle of the second taper portion 34 is formed in the cylindrical body 10.

加工部４０に到達したローラ型４６は、図４に示すように、第１テーパ部２８側から第２テーパ部３４側、又はその逆方向に向かうように往復動作する。この往復動作に追従して、円筒体１０における加工部４０に対応する部位が加工部４０の形状に倣って変形する。これにより円筒体１０の高さ方向略中腹部が縮径され、その結果、第１小径部３０及び第２小径部３２に対応する等径な凹部５６が形成される。 As shown in FIG. 4, the roller mold 46 that has reached the processing portion 40 reciprocates from the first taper portion 28 side toward the second taper portion 34 side or the opposite direction. Following this reciprocation, a portion of the cylindrical body 10 corresponding to the processing portion 40 is deformed following the shape of the processing portion 40. As a result, the substantially middle abdominal portion in the height direction of the cylindrical body 10 is reduced in diameter, and as a result, an equal-diameter concave portion 56 corresponding to the first small diameter portion 30 and the second small diameter portion 32 is formed.

ローラ型４６が往復動作する際、凹部５６の内壁が第１小径部３０及び第２小径部３２に当接しているために該凹部５６をさらに縮径することができないので、凹部５６は薄肉化されながら延伸する。すなわち、凹部５６の肉厚の最適化が行われる。また、これに伴い、円筒体１０の凹部５６が加工部４０に嵌合する。なお、この際に延伸化された肉は、自由端である左端部側に向かう。 When the roller mold 46 reciprocates, since the inner wall of the recess 56 is in contact with the first small diameter portion 30 and the second small diameter portion 32, the recess 56 cannot be further reduced in diameter, so the recess 56 is thinned. While being stretched. That is, the thickness of the recess 56 is optimized. Accordingly, the concave portion 56 of the cylindrical body 10 is fitted into the processed portion 40. Note that the stretched meat is directed to the left end side, which is a free end.

次に、ローラ型４６は、図５に示すように、加工部４０から第１テーパ部２８を越え、第１傾斜部２６に戻るように変位する。この変位により、円筒体１０における第１テーパ部２８に対応する部位にテーパ状大縮径部５２が形成される。 Next, as shown in FIG. 5, the roller mold 46 is displaced so as to return from the processed portion 40 to the first inclined portion 26 beyond the first tapered portion 28. By this displacement, a tapered large-diameter portion 52 is formed at a portion corresponding to the first tapered portion 28 in the cylindrical body 10.

第１傾斜部２６に到達したローラ型４６は、図５に示すように、第１等径部２４側から第１テーパ部２８側、又はその逆方向に向かうように往復動作する。これにより、既に形成されていたテーパ状縮径部５０の肉が延伸されて薄肉化する。すなわち、テーパ状縮径部５０の肉厚の最適化が行われる。 As shown in FIG. 5, the roller mold 46 that has reached the first inclined portion 26 reciprocates from the first constant diameter portion 24 side toward the first tapered portion 28 side or the opposite direction. Thereby, the thickness of the taper-shaped diameter-reduced part 50 already formed is extended | stretched and thinned. That is, the wall thickness of the tapered reduced diameter portion 50 is optimized.

上記したように、円筒体１０の凹部５６が金型１４の加工部４０に嵌合している。このため、テーパ状縮径部５０をしごく際に円筒体１０が第１等径部２４側に引っ張られることが回避される。すなわち、この場合においても、円筒体１０が金型１４に対して位置ズレを起こすことが防止される。 As described above, the concave portion 56 of the cylindrical body 10 is fitted to the processed portion 40 of the mold 14. For this reason, it is avoided that the cylindrical body 10 is pulled toward the first constant diameter portion 24 when the tapered reduced diameter portion 50 is squeezed. That is, also in this case, the cylindrical body 10 is prevented from being displaced with respect to the mold 14.

円筒体１０において、テーパ状縮径部５０から延伸された肉は、ローラ型４６がさらに第１等径部２４に指向して変位することに伴い、第１等径部２４に到達する。最終的に、該肉は左堰止板２０で堰止され、これにより、第１等径部２４に対応する第１一定径部５８が所定の肉厚で円筒体１０に形成される。 In the cylindrical body 10, the meat extended from the tapered reduced diameter portion 50 reaches the first constant diameter portion 24 as the roller mold 46 is further displaced toward the first constant diameter portion 24. Finally, the meat is blocked by the left blocking plate 20, whereby a first constant diameter portion 58 corresponding to the first constant diameter portion 24 is formed in the cylindrical body 10 with a predetermined thickness.

これにより、図５の左方から順に、第１一定径部５８、テーパ状縮径部５０、テーパ状大縮径部５２、等径な凹部５６、テーパ状大拡径部５４、テーパ状拡径部４８及び第２一定径部６０を有するリム１２が形成されるに至る。 Accordingly, in order from the left in FIG. 5, the first constant diameter portion 58, the tapered reduced diameter portion 50, the tapered large diameter reduced portion 52, the equal diameter concave portion 56, the tapered large diameter enlarged portion 54, and the tapered enlarged diameter portion. The rim 12 having the diameter portion 48 and the second constant diameter portion 60 is formed.

ローラ型４６を金型１４から離間する方向に変位させた後、金型１４の回転を停止する。さらに、クランプ爪４４を開放すれば、上記のように構成されたリム１２が金型１４から解放される。 After the roller mold 46 is displaced in the direction away from the mold 14, the rotation of the mold 14 is stopped. Further, when the clamp pawl 44 is opened, the rim 12 configured as described above is released from the mold 14.

以上のように、本実施の形態によれば、円筒体１０におけるクランプされた右端部から、クランプされていない左端部に向かって成形を行うようにしている。このため、円筒体１０（リム１２）の肉厚を最適化することが可能となる。 As described above, according to the present embodiment, molding is performed from the clamped right end portion of the cylindrical body 10 toward the unclamped left end portion. For this reason, it becomes possible to optimize the thickness of the cylindrical body 10 (rim 12).

また、テーパ状縮径部５０と凹部５６との間にテーパ状大縮径部５２を介在させ、且つ凹部５６とテーパ状拡径部４８との間にテーパ状大拡径部５４を介在させているので、テーパ状縮径部５０と凹部５６とのギャップ量、凹部５６とテーパ状拡径部４８とのギャップ量を徐々に変化させることができる。従って、テーパ状縮径部５０と凹部５６、凹部５６とテーパ状拡径部４８を直接連ねる場合に比して肉を延伸させることが容易となり、このため、肉厚を揃えることも容易となる。 Further, a tapered large diameter reducing portion 52 is interposed between the tapered diameter reducing portion 50 and the concave portion 56, and a tapered large diameter increasing portion 54 is interposed between the concave portion 56 and the tapered diameter expanding portion 48. Therefore, the gap amount between the tapered reduced diameter portion 50 and the recessed portion 56 and the gap amount between the recessed portion 56 and the tapered enlarged diameter portion 48 can be gradually changed. Therefore, it is easy to stretch the meat compared to the case where the tapered diameter-reduced portion 50 and the recessed portion 56 and the recessed portion 56 and the tapered enlarged diameter portion 48 are directly connected to each other. .

リム１２の肉厚を最適化することにより、該リム１２に、肉厚が過度に小さい箇所が存在することが回避される。従って、このリム１２は、全部位にわたって優れた剛性を示す。 By optimizing the thickness of the rim 12, it is avoided that the rim 12 has a portion having an excessively small thickness. Therefore, this rim 12 exhibits excellent rigidity over all parts.

また、肉厚を最適化するので、板材として厚肉のものを用いる必要がない。このため、リム１２の軽量化を図ることができるとともに、素材コストを低廉化することができる。 Further, since the thickness is optimized, it is not necessary to use a thick plate as the plate material. For this reason, the rim 12 can be reduced in weight, and the material cost can be reduced.

さらに、上記から諒解される通り、円筒体１０の一端部をクランプする必要がないため、クランプ爪４４、ひいてはクランプ機構の個数が低減する。従って、成形加工装置の構成を簡素化することができる。その上、該一端部に対する成形の自由度が増すので、一層複雑な形状に成形することが可能となる。 Further, as understood from the above, since it is not necessary to clamp one end of the cylindrical body 10, the number of the clamp claws 44 and the number of clamp mechanisms is reduced. Therefore, the configuration of the molding apparatus can be simplified. In addition, since the degree of freedom of molding with respect to the one end is increased, it is possible to mold into a more complicated shape.

なお、上記した実施の形態では、第１傾斜部２６と加工部４０の間に第１テーパ部２８が存在し且つ加工部４０と第２傾斜部３６の間に第２テーパ部３４が存在する金型１４を用いるようにしているが、第１傾斜部２６と加工部４０の間に第１テーパ部２８が存在しない金型であってもよいし、加工部４０と第２傾斜部３６の間に第２テーパ部３４が存在しない金型であってもよい。勿論、第１テーパ部２８及び第２テーパ部３４の双方が存在しない金型であってもよい。 In the embodiment described above, the first tapered portion 28 exists between the first inclined portion 26 and the processed portion 40, and the second tapered portion 34 exists between the processed portion 40 and the second inclined portion 36. Although the mold 14 is used, it may be a mold in which the first tapered portion 28 does not exist between the first inclined portion 26 and the processed portion 40, or the processed portion 40 and the second inclined portion 36. It may be a mold in which the second taper portion 34 does not exist between them. Of course, the metal mold | die in which both the 1st taper part 28 and the 2nd taper part 34 do not exist may be sufficient.

また、ワーク移動防止手段は、クランプ機構に特に限定されるものではない。例えば、右堰止板４２をワーク移動防止手段として用いるようにしてもよい。 Further, the workpiece movement preventing means is not particularly limited to the clamp mechanism. For example, the right dam plate 42 may be used as a work movement prevention means.

この場合、ローラ型４６が第１傾斜部２６から第２傾斜部３６側に移動することに伴い、円筒体１０が右堰止板４２に押接するようになる。従って、右端部がクランプされていない該円筒体１０においても、空転が起こることはない。 In this case, as the roller mold 46 moves from the first inclined portion 26 toward the second inclined portion 36, the cylindrical body 10 comes into pressure contact with the right dam plate 42. Therefore, idling does not occur even in the cylindrical body 10 whose right end is not clamped.

さらに、上記では、円筒体１０における第２傾斜部３６に対応する部位に対する加工を行った後、加工部４０に対応する部位に対する加工を行うようにしているが、この順序を逆にしてもよい。すなわち、加工部４０に対応する部位に対する加工を行った後、第２傾斜部３６に対応する部位に対する加工を行うようにしてもよい。 Furthermore, in the above description, after the portion corresponding to the second inclined portion 36 in the cylindrical body 10 is processed, the portion corresponding to the processed portion 40 is processed, but this order may be reversed. . In other words, after the portion corresponding to the processing portion 40 is processed, the portion corresponding to the second inclined portion 36 may be processed.

そして、この実施の形態では、リム１２を得る場合を例示して説明しているが、得られる成形品としては、如何なるものであってもよい。 In this embodiment, the case where the rim 12 is obtained is described as an example. However, any molded product may be obtained.

１０…円筒体１２…リム
１４…金型２４…第１等径部
２６…第１傾斜部２８…第１テーパ部
３０…第１小径部３２…第２小径部
３４…第２テーパ部３６…第２傾斜部
３８…第２等径部４０…加工部
４４…クランプ爪４６…ローラ型
４８…テーパ状拡径部５０…テーパ状縮径部
５２…テーパ状大縮径部５４…テーパ状大拡径部
５６…凹部５８、６０…一定径部 DESCRIPTION OF SYMBOLS 10 ... Cylindrical body 12 ... Rim 14 ... Mold 24 ... 1st equal diameter part 26 ... 1st inclination part 28 ... 1st taper part 30 ... 1st small diameter part 32 ... 2nd small diameter part 34 ... 2nd taper part 36 ... 2nd inclined part 38 ... 2nd equal diameter part 40 ... Processing part 44 ... Clamp claw 46 ... Roller type 48 ... Tapered diameter expansion part 50 ... Tapered diameter reduction part 52 ... Tapered large diameter reduction part 54 ... Taper shape large Expanded diameter part 56 ... concave part 58, 60 ... constant diameter part

Claims

A spinning method for forming a recess recessed along the radial direction of the cylindrical workpiece by bringing a roller mold into contact with the side wall of the cylindrical workpiece,
A first constant diameter portion and a second constant diameter portion that have a constant diameter and are spaced apart from each other, and a first slope that is continuous with the first constant diameter portion and decreases in a tapered shape as the distance from the first constant diameter portion increases A second inclined portion that expands in a tapered shape as it approaches the second equal-diameter portion and is continuous with the second equal-diameter portion, and is interposed between the first inclined portion and the second inclined portion. And a machining part having a constant diameter, and a mold provided with a workpiece movement preventing means for preventing the cylindrical workpiece from moving from the first inclined part toward the second inclined part. A mounting process for mounting a cylindrical workpiece;
The roller mold is pressed against a portion corresponding to the first inclined portion in the cylindrical workpiece and is displaced from the first inclined portion toward the second inclined portion, whereby the portion is shaped as the first inclined portion. A first molding step for molding in accordance with
The roller mold is pressed against a portion corresponding to the second inclined portion of the cylindrical workpiece and displaced from the second inclined portion toward the first inclined portion, thereby forming the portion into the shape of the second inclined portion. A second molding step for molding in accordance with
By pressing and displacing the roller mold against a portion corresponding to the processed portion in the cylindrical workpiece, the portion is molded following the shape of the processed portion, and the meat of the portion is formed by the roller mold. A third molding step of stretching by squeezing;
In the first molding step, the second molding step and the third molding step, the first molding step is performed first,
The cylindrical workpiece has a first constant diameter portion corresponding to the first equal diameter portion, a tapered reduced diameter portion having a shape corresponding to the shape of the first inclined portion, and a concave portion having a shape corresponding to the shape of the processing portion. A spinning method comprising: forming a tapered enlarged diameter portion having a shape corresponding to the shape of the second inclined portion and a second constant diameter portion corresponding to the second equal diameter portion.

2. The spinning method according to claim 1, wherein a clamp mechanism is used as the workpiece movement preventing means, and only one end portion of the cylindrical workpiece on the second constant-diameter portion side is clamped by the clamp mechanism. Processing method.

3. The processing method according to claim 1, wherein, as the mold, the first inclination is between the first inclined part and the processing part, and between the processing part and the second inclined part, respectively. Using a portion having a first taper portion and a second taper portion having a larger taper angle than the portion and the second inclined portion,
A tapered large reduced diameter portion having a taper angle larger than that of the tapered reduced diameter portion is formed at a portion corresponding to the first tapered portion in the cylindrical workpiece, and the second taper in the cylindrical workpiece is formed. A spinning large-diameter enlarged portion having a taper angle larger than that of the tapered enlarged-diameter portion is formed in a portion corresponding to the portion.

The spinning method according to any one of claims 1 to 3, wherein a wheel rim is obtained by forming the cylindrical workpiece.