JP2002178075A - Method of manufacturing rim for automobile - Google Patents
Method of manufacturing rim for automobileInfo
- Publication number
- JP2002178075A JP2002178075A JP2000386755A JP2000386755A JP2002178075A JP 2002178075 A JP2002178075 A JP 2002178075A JP 2000386755 A JP2000386755 A JP 2000386755A JP 2000386755 A JP2000386755 A JP 2000386755A JP 2002178075 A JP2002178075 A JP 2002178075A
- Authority
- JP
- Japan
- Prior art keywords
- rim
- forming
- manufacturing
- convex portion
- convex
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は自動車用リムの製造
方法に関するもので、より詳しくは、ロードノイズを低
減できる自動車用ディスクホイールのリムの製造方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rim for an automobile, and more particularly, to a method for manufacturing a rim for an automobile disk wheel capable of reducing road noise.
【０００２】[0002]
【従来の技術】従来、自動車用タイヤにおいては、タイ
ヤ内周面とディスクホイールのリム外周面との間で形成
される内腔部（閉空間）の気柱共鳴によってロードノイ
ズが悪化することが知られている。これは、タイヤとリ
ムとで形成される前記の内腔部がタイヤの周方向におい
て同一断面積であるため、内腔部の共鳴がタイヤの回転
にかかわらず一定となり、常に一定の周波数で同じ方向
に加振されるためである。2. Description of the Related Art Conventionally, in a vehicle tire, road noise is deteriorated due to air column resonance of a cavity (closed space) formed between an inner peripheral surface of the tire and an outer peripheral surface of a rim of a disk wheel. Are known. This is because the cavity formed by the tire and the rim has the same cross-sectional area in the circumferential direction of the tire, so that the resonance of the cavity is constant regardless of the rotation of the tire, and is always the same at a constant frequency. This is because they are vibrated in the direction.
【０００３】このロードノイズの悪化を抑制する方法と
して、リムウェル部に可動式の遮蔽板を複数取り付け、
走行時にこの遮蔽板が遠心力により起立して前記の内腔
部を区画し、気柱共鳴の共鳴周波数をロードノイズの問
題とならないような振動周波数領域へシフトさせてロー
ドノイズの低減を図るようにしたものが特開平１１−２
４５６０５号公報に開示されている。これを第１の従来
の技術とする。As a method of suppressing the deterioration of the road noise, a plurality of movable shield plates are attached to a rim well portion,
When running, this shield plate is erected by centrifugal force to partition the above-mentioned lumen, and shifts the resonance frequency of air column resonance to a vibration frequency region that does not cause a problem of road noise so as to reduce road noise. Japanese Patent Laid-Open No. 11-2
No. 45605. This is referred to as a first conventional technique.
【０００４】また、前記の内腔部を区画するための隔壁
を複数形成した可撓性リングをタイヤ内部に内挿して、
前記と同様にロードノイズを低減させるものが特許第３
００３４７８号公報に開示されている。これを第２の従
来の技術とする。[0004] A flexible ring having a plurality of partitions for partitioning the lumen is inserted into the tire,
Patent No. 3 that reduces road noise as described above
No. 003478 discloses it. This is referred to as a second conventional technique.
【０００５】[0005]
【発明が解決しようとする課題】前記第１及び第２の従
来の技術については、いずれもディスクホイールとは別
体に形成した遮蔽板や可撓性リングを取り付けるため、
コスト高になる上に、前記第１の従来の技術において
は、タイヤ組付時にタイヤが遮蔽板に当り、遮蔽板を破
損させるおそれがある。In the first and second prior arts, a shield plate and a flexible ring formed separately from the disk wheel are attached.
In addition to the increase in cost, in the first conventional technique, the tire may hit the shield plate when the tire is assembled, and the shield plate may be damaged.
【０００６】そこで本発明は、前記の問題を解決するこ
とができるリムを容易に製造することができる自動車用
リムの製造方法を提供することを目的とするものであ
る。Accordingly, an object of the present invention is to provide a method of manufacturing a rim for an automobile which can easily manufacture a rim capable of solving the above-mentioned problem.
【０００７】[0007]
【課題を解決するための手段】前記の課題を解決するた
めに、請求項１記載の第１の発明は、素管から自動車用
リムを製造する方法において、リムの中間素管における
レッジ部を部分的に径方向の内側から外側へ押し出し
て、レッジ部の周方向に適宜間隔を有して複数の凸部を
形成する凸部成形工程を含むことを特徴とするものであ
る。According to a first aspect of the present invention, there is provided a method of manufacturing a rim for an automobile from a base tube, the method comprising the steps of: The method is characterized by including a convex part forming step of partially extruding from the radially inner side to the outer side and forming a plurality of convex parts at appropriate intervals in the circumferential direction of the ledge part.
【０００８】請求項２記載の第２の発明は、前記第１の
発明において、前記凸部成形工程を、リムの中間素材の
内外に凸部成形用の成形型を配置し、その内型をリムの
径方向の外側へ移動して、プレス成形により前記の凸部
を成形するようにしたことを特徴とするものである。According to a second aspect of the present invention, in the first aspect, the step of forming the convex portion includes arranging a forming die for forming the convex portion inside and outside the intermediate material of the rim. The rim is moved outward in the radial direction to form the convex portion by press molding.
【０００９】請求項３記載の第３の発明は、前記第１又
は第２の発明において、前記凸部成形工程後に、リムの
最終形状の成形を行うようにしたものである。According to a third aspect of the present invention, in the first or second aspect, after the convex portion forming step, the final shape of the rim is formed.
【００１０】請求項４記載の第４の発明は、前記第１又
は第２又は第３の発明において、前記凸部成形工程後の
前段において、１対の成形ロールを用いてリム全幅に亘
って所定の形状に予備成形することを特徴とするもので
ある。According to a fourth aspect of the present invention, in the first, second or third aspect of the present invention, a pair of forming rolls is used to cover the entire width of the rim in a preceding stage after the convex forming step. It is characterized by being preformed into a predetermined shape.
【００１１】請求項５記載の第５の発明は、前記第１又
は第２又は第３又は第４の発明において、前記凸部成形
工程の前段のフレアー成形と予備成形を１回のプレス成
形にて行うことを特徴とするものである。According to a fifth aspect of the present invention, in the first, second, third or fourth aspect of the present invention, the flare forming and the preliminary forming in the first stage of the convex forming step are performed by one press forming. It is characterized by performing.
【００１２】[0012]
【発明の実施の形態】図に示す実施例に基づいて本発明
の実施の形態について説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described based on an embodiment shown in the drawings.
【００１３】先ず、本発明の製造方法により製造される
リムについて説明する。First, a rim manufactured by the manufacturing method of the present invention will be described.
【００１４】図１は本発明により製造されたリムにタイ
ヤを組み付けた状態の縦断面図で、リム１の内側にディ
スク２が嵌合固着された２ピースタイプのホイールにお
いて、そのリム１の外周にタイヤ３が組み付けられてい
る。該リム１の外周面とタイヤ３の内周面との間に密閉
された空腔部４が形成されている。FIG. 1 is a longitudinal sectional view showing a state in which a tire is mounted on a rim manufactured according to the present invention. In a two-piece wheel in which a disk 2 is fitted and fixed inside a rim 1, an outer periphery of the rim 1 is shown. The tire 3 is mounted on the vehicle. A sealed cavity 4 is formed between the outer peripheral surface of the rim 1 and the inner peripheral surface of the tire 3.
【００１５】前記リム１の形状について図２乃至図５に
より説明する。The shape of the rim 1 will be described with reference to FIGS.
【００１６】リム１のレッジ部５には、その周方向に適
宜間隔を有して凸部６が形成されており、該凸部６はリ
ム自体を部分的に外方（径方向の外側）へ押し出して形
成されている。ここにレッジ部５とは、図６に示すよう
な、タイヤ３が嵌合される両ビートシート部７，８とデ
ィスク２が嵌合固定されるドロップ部９を除く部分であ
り、図６のＤの範囲に示す部分をいう。The ledges 5 of the rim 1 are formed with convex portions 6 at appropriate intervals in the circumferential direction, and the convex portions 6 partially rim the rim itself (outside in the radial direction). It is extruded and formed. Here, the ledge portion 5 is a portion excluding a beat portion 7, 8 in which the tire 3 is fitted and a drop portion 9 in which the disc 2 is fitted and fixed, as shown in FIG. The part shown in the range of D is referred to.
【００１７】また、前記凸部６の頂部はリムの軸芯を中
心とする略真円に形成され、更に、前記凹部１０はリム
の軸芯を中心とする略真円に形成されている。The top of the projection 6 is formed in a substantially perfect circle centered on the axis of the rim, and the recess 10 is formed in a substantially perfect circle centered on the axis of the rim.
【００１８】前記のように凸部６を周方向に部分的に形
成することにより、レッジ部５に周方向、すなわちタイ
ヤの回転方向に、前記の凸部６と該凸部６以外の部分で
形成される凹部１０とが交互に形成される。As described above, by forming the protrusion 6 partially in the circumferential direction, the protrusion 6 and the portion other than the protrusion 6 are formed in the ledge 5 in the circumferential direction, that is, in the rotation direction of the tire. The formed recesses 10 are formed alternately.
【００１９】前記凸部６と凹部１０は、タイヤ３とリム
１で囲まれた前記空腔部４の周方向での断面積が、凸部
６と凹部１０とにおいて相対的に２％以上、望ましくは
略２．５％変化するように形成する。すなわち、空腔部
４の周方向での断面積が凸部６において、凹部１０より
２％以上、望ましくは２．５％減少するように形成され
ている。The convex portion 6 and the concave portion 10 have a cross-sectional area in the circumferential direction of the cavity 4 surrounded by the tire 3 and the rim 1 in the convex portion 6 and the concave portion 10 of at least 2%. Preferably, it is formed so as to change by about 2.5%. That is, the cavity 4 is formed such that the cross-sectional area in the circumferential direction of the convex portion 6 is reduced by 2% or more, preferably 2.5%, from the concave portion 10.
【００２０】また、前記凸部６はリム１の周方向に所望
数設けるものであるが、図の実施例のように、リム１の
レッジ部５を周方向に４等分し、その１／４の範囲毎に
凸部６と凹部１０を交互に配置し、２個の凸部６が１８
０度離れて対向し、２個の凹部１０が１８０度離れて対
向するように配置することが望ましい。Although a desired number of the convex portions 6 are provided in the circumferential direction of the rim 1, the ledge portion 5 of the rim 1 is divided into four equal portions in the circumferential direction as shown in the embodiment of FIG. The convex portions 6 and the concave portions 10 are alternately arranged in each of the four ranges, and the two convex portions 6 are 18
It is desirable that the two concave portions 10 are arranged so as to face each other at a distance of 0 degrees and face each other at a distance of 180 degrees.
【００２１】前記のようにリム１のレッジ部５に凹凸を
形成して空腔部４の断面積を周方向、すなわちタイヤの
回転方向に変化させることにより、走行時のタイヤ３の
回転により、前記凸部６が位置する部分でのタイヤ３の
接地と、前記凹部１０が位置する部分でのタイヤ３の接
地が交互に行われて、接地部での空腔部４の断面積がタ
イヤの回転に伴って変化し、その結果、気柱共鳴の共鳴
周波数をロードノイズの問題とならないような振動周波
数領域へシフトさせることができるとともに加振方向も
変化させることができる。As described above, by forming irregularities on the ledge portion 5 of the rim 1 and changing the cross-sectional area of the cavity portion 4 in the circumferential direction, that is, in the rotation direction of the tire, the rotation of the tire 3 during running allows The grounding of the tire 3 at the portion where the convex portion 6 is located and the grounding of the tire 3 at the portion where the concave portion 10 is located are performed alternately. It changes with rotation, and as a result, the resonance frequency of air column resonance can be shifted to a vibration frequency region where road noise does not become a problem, and the exciting direction can also be changed.
【００２２】前記の凸部６と凹部１０を図の実施例の位
置に配置するとともに、前記空腔部４の断面積が周方向
において２．５％変化するようにしたホイールを使用し
て実験した結果、ロードノイズが発生する周波数２００
〜３００Ｈｚにおいてロードノイズを３〜６ｄＢ低減で
きた。An experiment was conducted using a wheel in which the convex portion 6 and the concave portion 10 were arranged at the positions of the embodiment shown in the figure, and the sectional area of the cavity 4 was changed by 2.5% in the circumferential direction. As a result, the frequency 200 at which road noise occurs
At ~ 300 Hz, the road noise was reduced by 3-6 dB.
【００２３】次に、前記の凸部６を形成したリム１の製
造方法について説明する。Next, a method of manufacturing the rim 1 having the above-mentioned convex portions 6 will be described.
【００２４】図７は本発明のリムの製造方法の第１実施
例を示す。FIG. 7 shows a first embodiment of the method of manufacturing a rim according to the present invention.
【００２５】図７（Ａ）は加工工程を示し、（Ｂ）はそ
の加工工程により形成されたリムの形状を示す。FIG. 7A shows the processing step, and FIG. 7B shows the shape of the rim formed by the processing step.
【００２６】図７（Ａ）において、先ず金属製のリムの
素管１Ａを用意する。該素管１Ａは所定径で両端２０，
２１が開口している。In FIG. 7A, a metal rim tube 1A is first prepared. The base tube 1A has a predetermined diameter at both ends 20,
21 is open.
【００２７】次に、第１工程として前記素管１Ａの両
端２０，２１から、フレア成形型３０，３１を矢印方向
へ圧入して両端部にフレア２２，２３を成形した第１の
中間素管１Ｂを得る。Next, as a first step, flared molds 30 and 31 are press-fitted from both ends 20 and 21 of the raw tube 1A in the direction of the arrows to form flares 22 and 23 at both ends, respectively. Obtain 1B.
【００２８】次に、第２工程として前記第１の中間素
管１Ｂを内外からなる１対の第１ロール３２，３３によ
り予備成形して第２の中間素管１Ｃを得る。この予備成
形は、後工程で成形されるフランジ部、ハンプ部、レッ
ジ部、ドロップ部などを図７（Ｂ）に示すような所定
の形状に予備成形するもので、これは後工程での形状確
保と板ひけを防止するためのものである。Next, as a second step, the first intermediate tube 1B is preformed by a pair of first and second rolls 32 and 33, which are inside and outside, to obtain a second intermediate tube 1C. In this preforming, a flange portion, a hump portion, a ledge portion, a drop portion, and the like, which are formed in a subsequent process, are preformed into a predetermined shape as shown in FIG. It is for securing and preventing sinking.
【００２９】次に、第３工程として、前記予備成形さ
れた第２の中間素管１Ｃに前記の凸部６をプレス成形に
よって形成する。この工程を凸部成形工程とする。な
お、この工程において、凸部６以外の部分も必要により
成形する。Next, as a third step, the convex portion 6 is formed by press molding on the preformed second intermediate shell 1C. This step is referred to as a convex part forming step. In this step, portions other than the convex portions 6 are formed as necessary.
【００３０】この第３工程で使用する成形型を図８及び
図９に示す。この成形型は、環状の外型３４と環状の内
型３５とからなる。また、外型３４と内型３５は、図９
に示すように、夫々放射状に分割されて複数個の分割型
３４ａ，３５ａからなる。この分割数は２〜１４とする
ことが望ましく、図の例では８分割されている。更に、
外型３４の分割型３４ａは夫々径方向（図８の矢印Ｅ−
Ｆ方向）に移動可能に設けられているとともにこの移動
を行うために駆動手段（図示せず）が設けられている。
該外型３４の内面には、前記凸部６を成形するための凹
型面３６とその他所望の型面が形成されている。FIGS. 8 and 9 show a mold used in the third step. This mold includes an annular outer mold 34 and an annular inner mold 35. Further, the outer mold 34 and the inner mold 35 are arranged as shown in FIG.
As shown in FIG. 7, each is divided radially into a plurality of split molds 34a and 35a. The number of divisions is desirably 2 to 14, and is divided into 8 in the example shown. Furthermore,
The split molds 34a of the outer mold 34 are each in the radial direction (arrow E-
(F direction) and a driving means (not shown) for performing this movement.
On the inner surface of the outer mold 34, a concave mold surface 36 for molding the convex portion 6 and other desired mold surfaces are formed.
【００３１】また、前記内型３５の分割型３５ａも夫々
径方向（図８の矢印Ｇ−Ｈ方向）に移動可能に設けられ
ている。該内型３５の外面には前記凸部６を成形するた
めの凸型面３７とその他所望の型面が形成されている。
該内型３５の中心部には、軸方向の一方が縮径する円錐
型の穴３８が形成され、内型３５の各分割型３５ａの内
面がテーパ面３９に形成されている。The split dies 35a of the inner die 35 are also provided so as to be movable in the radial direction (the direction of arrows GH in FIG. 8). On the outer surface of the inner mold 35, a convex mold surface 37 for molding the convex portion 6 and other desired mold surfaces are formed.
At the center of the inner mold 35, a conical hole 38 whose one side in the axial direction is reduced in diameter is formed, and the inner surface of each split mold 35 a of the inner mold 35 is formed in a tapered surface 39.
【００３２】前記内型３５の穴３８の位置には、内型３
５と同軸で昇降移動するカム４０が配置されており、該
カム４０が図示しない駆動手段により昇降するようにな
っている。該カム４０の先部は前記テーパ面３９のテー
パ角に沿ったテーパ面からなる押し面４１が形成され、
該カム４０を矢印Ｉ方向へ移動することにより押し面４
１が内型３５の各分割型３５ａを径方向の外側へ押し移
動するようになっている。At the position of the hole 38 of the inner mold 35, the inner mold 3
A cam 40 that moves up and down coaxially with the cam 5 is arranged, and the cam 40 is moved up and down by a driving unit (not shown). The tip of the cam 40 has a pressing surface 41 formed of a tapered surface along the taper angle of the tapered surface 39,
By moving the cam 40 in the direction of arrow I, the pressing surface 4
1 pushes and moves each split mold 35a of the inner mold 35 radially outward.
【００３３】前記の成形型を使用して、第３工程を行
うには、先ず、外型３４の分割型３４ａを矢印Ｆ方向へ
移動して外型３４を拡径するとともに内型３５の分割型
３５ａを矢印Ｇ方向へ移動して内型３５を縮径してお
く。そして、この外型３４と内型３５の間に前記第２工
程で成形された第２の中間素管１Ｃを介在して外型３
４と内型３５の各分割型３４ａを矢印Ｅ方向へ移動して
第２の中間素管１Ｃをクランプする（図８における左側
の状態）。In order to perform the third step using the above-mentioned mold, first, the outer mold 34 is moved in the direction of arrow F by moving the split mold 34a of the outer mold 34, and the inner mold 35 is divided. The inner mold 35 is reduced in diameter by moving the mold 35a in the direction of arrow G. The outer mold 3 is inserted between the outer mold 34 and the inner mold 35 with the second intermediate shell 1C formed in the second step interposed therebetween.
Each of the divided molds 34a of the inner mold 4 and the inner mold 35 is moved in the direction of arrow E to clamp the second intermediate tube 1C (the left state in FIG. 8).
【００３４】次に、カム４０を矢印Ｉ方向に下降する。
この下降により、該カム４０の押し面４１が内型３５に
おける各分割型３５ａのテーパ面３９に係合摺動し、カ
ム４０の軸方向荷重の分力により内型３５の各分割型３
５ａが径方向の外側（矢印Ｈ方向）へ押し移動される。
このように内型３５が押し移動されると、図８の右側に
示すように、その内型３５に形成した凸型面３７によっ
て前記第２の中間素管１Ｃにおけるレッジ部の一部が径
方向の外側へ押し出し（張り出し）加工され、前記の凸
部６が成形されて第３の中間素管１Ｄがプレス形成され
る。この第３工程により成形された凸部６及びその周辺
の形状を図１０に示す。Next, the cam 40 is lowered in the direction of arrow I.
Due to this lowering, the pressing surface 41 of the cam 40 engages with and slides on the tapered surface 39 of each of the split dies 35 a of the inner die 35, and the divided dies 3 of the inner die 35 are divided by the axial force of the cam 40.
5a is pushed outward in the radial direction (in the direction of arrow H).
When the inner mold 35 is pushed and moved in this way, as shown on the right side of FIG. 8, a part of the ledge portion of the second intermediate tube 1C has a diameter due to the convex surface 37 formed on the inner mold 35. It is extruded (extended) outward in the direction, the above-mentioned convex portion 6 is formed, and the third intermediate tube 1D is press-formed. FIG. 10 shows the shape of the convex portion 6 formed in the third step and the periphery thereof.
【００３５】このように凸部６を径方向の外側へ加工す
ることにより、材料の軸方向の動きがほとんどなくな
り、リム幅方向の変動がわずかですむ。By processing the convex portion 6 outward in the radial direction in this manner, the material hardly moves in the axial direction, and the fluctuation in the rim width direction is small.
【００３６】例えば図１１に示すように、内型として内
上型４２と内下型４３を用いるとともにこの内上型４２
に凸型面４４を形成し、前記と同様の外型３４で第２の
中間素管１Ｃをクランプした後に内上型４２を図１１の
矢印に示すように軸方向に移動して、凸型面４４の軸方
向移動により凸部６を加工すると、図１２に示すように
材料と凸型面４４の接線角θが大きくなって摩擦抵抗が
大きくなり、材料が軸方向に押されて図１２のβで示す
ような座屈を生じる。このような座屈が生じると、リム
幅の変動が大きく、またフランジ幅が狭くなって規格外
れとなる。また、狭くなる分を見込んで材料幅を広くし
なければならず不経済になる問題がある。For example, as shown in FIG. 11, an inner upper mold 42 and an inner lower mold 43 are used as inner molds.
A convex surface 44 is formed on the second intermediate tube 1C, and the inner upper die 42 is axially moved as shown by an arrow in FIG. When the convex portion 6 is machined by moving the surface 44 in the axial direction, the tangent angle θ between the material and the convex surface 44 increases to increase the frictional resistance as shown in FIG. Buckling as indicated by β in FIG. When such buckling occurs, the fluctuation of the rim width is large, and the flange width is narrowed, which is out of specification. In addition, there is a problem that the material width must be increased in anticipation of the narrowing, which is uneconomical.
【００３７】これに対し、本発明の実施例のように、凸
部６を径方向にプレス加工することにより、材料を引っ
張る引っ張り加工となり、前記の問題を解消することが
できる。On the other hand, by pressing the convex portion 6 in the radial direction as in the embodiment of the present invention, the material is pulled, whereby the above problem can be solved.
【００３８】また、凸部６の加工方法として、凸部６以
外のレッジ部分を外周面側から内周面側へ凹加工するこ
とも考えられるが、この加工は、いわゆる圧縮加工とな
り、一般的な張り出し加工と比較してその加工が困難で
ある。そのため、本発明の実施例においては、凸部６を
レッジ部５の内側面から外側面へ凸加工する張り出し加
工として凸部６の加工を容易にしたものである。前記の
凸部成形工程後に次の工程によりリムの最終形状の成形
を行う。As a method of processing the convex portion 6, it is conceivable to recess the ledge portion other than the convex portion 6 from the outer peripheral surface side to the inner peripheral surface side. The processing is more difficult than the overhang processing. Therefore, in the embodiment of the present invention, the processing of the convex portion 6 is facilitated as the overhanging process of projecting the convex portion 6 from the inner side surface to the outer side surface of the ledge portion 5. After the above-mentioned convex part forming step, the final shape of the rim is formed by the following steps.
【００３９】第４工程として、内外からなる一対の第
３ロール４５，４６により、前記第３工程で成形された
第３の中間素管１Ｄのビードシート部、ハンプ部、ドロ
ップ部の形状加工及びフランジ部のカール加工を行い、
リム全幅に亘って所定の形状に予備成形し、第４の中間
素管１Ｅを成形する。この第４工程により成形された
形状を図１３に示す。図１３において、５はレッジ部、
７，８はビードシート部、９はドロップ部、２４はハン
プ部を示す。In a fourth step, the bead sheet portion, the hump portion, and the drop portion of the third intermediate tube 1D formed in the third step are formed by a pair of inner and outer third rolls 45 and 46. Perform the curl processing of the flange part,
The preform is preformed into a predetermined shape over the entire width of the rim, and the fourth intermediate tube 1E is formed. FIG. 13 shows the shape formed by the fourth step. In FIG. 13, 5 is a ledge part,
Reference numerals 7 and 8 denote a bead seat portion, 9 denotes a drop portion, and 24 denotes a hump portion.
【００４０】この第４工程を行うのは、前記第３工程
では、主にレッジ部５における凸部６の凸加工が行わ
れ、図１４に示すように、前記第３工程で成形される
凸部６の線長Ｌ1 がレッジ部５の線長Ｌ2 よりも長く
（約１０％長く）なり、他の部位より加工度が大きくな
るとともに他の部位の形状は保証されていないため、凸
部６以外の部位の形状を整えるものである。The fourth step is carried out mainly in the third step, in which the convex portion 6 of the ledge portion 5 is subjected to convex processing, and as shown in FIG. 14, the convex portion formed in the third step is formed. Since the line length L 1 of the portion 6 is longer than the line length L 2 of the ledge portion 5 (about 10% longer), the workability is larger than other portions, and the shape of other portions is not guaranteed. The shape of the parts other than the part 6 is adjusted.
【００４１】次に、第５工程として図７（Ａ）に示
すように、割型からなる内型４７の外周に前記第４の中
間素管１Ｅを配置し、テーパ状のカム４８，４９を図の
矢印方向へ移動して内型４７を径方向の外側へ押圧し、
第４の中間素管１Ｅを内側から外側へ拡径して所定の寸
法、振れ精度に成形する。この第５工程は従来のリム
成形と同様である。この第５工程の終了により、図７
（Ｂ）に示すように、前記図１〜図５に示すような凸
部６を形成したリム１が得られる。Next, as a fifth step, as shown in FIG. 7 (A), the fourth intermediate tube 1E is arranged on the outer periphery of an inner mold 47 formed of a split mold, and tapered cams 48, 49 are formed. Move in the direction of the arrow in the figure to press the inner mold 47 outward in the radial direction,
The diameter of the fourth intermediate tube 1E is expanded from the inside to the outside, and is formed to a predetermined size and runout accuracy. This fifth step is the same as the conventional rim molding. By the completion of the fifth step, FIG.
As shown in FIG. 1B, the rim 1 having the projections 6 as shown in FIGS. 1 to 5 is obtained.
【００４２】次に、前記の凸部６を形成したリム１の他
の製造方法について図１５により説明する。Next, another method of manufacturing the rim 1 having the above-mentioned projections 6 will be described with reference to FIG.
【００４３】本第２実施例は、前記図７に示す第１実施
例の第１工程と第２工程を１つの工程で行うように
したものである。In the second embodiment, the first step and the second step of the first embodiment shown in FIG. 7 are performed in one step.
【００４４】図１５の（Ａ）は加工工程を示し、（Ｂ）
はその加工工程により形成されたリムを示す。FIG. 15A shows a processing step, and FIG.
Indicates a rim formed by the processing step.
【００４５】図１５（Ａ）において、先ず金属製のリム
の素管１Ａを用意する。該素管１Ａは所定径で両端２
０，２１が開口している。In FIG. 15A, a metal rim tube 1A is first prepared. The base tube 1A has a predetermined diameter and ends 2
0 and 21 are open.
【００４６】次に、第１工程として前記素管１Ａの開
口両端２０，２１から成形型５０，５１を素管１Ａの軸
方向に矢印の如く圧入して前記第１実施例における図７
（Ｂ）と略同形状の第１の中間素管１Ｆをプレス成形
により予備成形する。すなわち、フランジ部、ハンプ
部、レッジ部、ドロップ部を予備成形するとともに、同
時にフランジ部のＲ加工を行う。また、この成形は、図
１５（Ａ）に示すように、素管１Ａを、その開口両端
２０，２１が上下に向くように配置し、上側の成形型５
０と下側の成形型５１とで成形することが望ましい。ま
た、当然ながら両成形型５０，５１の外周型面は、前記
第１実施例における図７（Ｂ）の形状と同等の形状を
形成できる型面に形成されている。そして、両成形型５
０，５１により前記素管１Ａを径方向の外側へ押し出し
て素管１Ａの材料が引っ張り加工されるように形成する
ようになっている。Next, as a first step, molding dies 50 and 51 are pressed into the axial direction of the raw tube 1A from both ends 20 and 21 of the raw tube 1A as shown by arrows in the axial direction of FIG.
A first intermediate shell 1F having substantially the same shape as (B) is preformed by press molding. That is, the flange portion, the hump portion, the ledge portion, and the drop portion are preformed, and the R portion of the flange portion is simultaneously processed. In this molding, as shown in FIG. 15 (A), the raw tube 1A is arranged so that both ends 20, 21 of the opening face up and down, and the upper molding die 5 is formed.
It is desirable to mold with 0 and the lower mold 51. The outer peripheral surfaces of the molding dies 50 and 51 are naturally formed on the surfaces that can form a shape equivalent to the shape of FIG. 7B in the first embodiment. And both molds 5
By means of 0 and 51, the raw tube 1A is extruded radially outward so that the material of the raw tube 1A is stretched.
【００４７】この第１工程は、素管１Ａの軸方向加工
であっても、加工傾斜角が小さいため、摩擦抵抗も少な
く、シワ、肉ひけもなく、均一に加工することができ
る。In the first step, even in the processing of the raw tube 1A in the axial direction, since the processing inclination angle is small, the processing can be performed uniformly with little frictional resistance, no wrinkles and no undercut.
【００４８】次に、第２工程として、前記第１の中間
素管１Ｆを、前記第１実施例における図７（Ａ）に示す
第３工程と同様の外型３４と内型３５とカム４０を用
いて同様の成形方向によりプレス加工し、前記第１実施
例における図７（Ｂ）と同形状の第２の中間素管１Ｇ
を得る。この第２工程においても前記と同様に、材料
を引っ張る引っ張り加工となる。Next, as a second step, the first intermediate tube 1F is connected to the outer mold 34, the inner mold 35 and the cam 40 in the same manner as in the third step of the first embodiment shown in FIG. And the second intermediate tube 1G having the same shape as that of FIG. 7B in the first embodiment.
Get. Also in the second step, a pulling process for pulling the material is performed in the same manner as described above.
【００４９】次に、第３工程として、前記第２の中間
素管１Ｇを前記第１実施例における図７（Ａ）に示す第
４工程と同様の内外からなる一対の第３ロール４５，
４６を用いて同様の成形方法により加工し、前記第１実
施例における図７（Ｂ）と同形状の第３の中間素管１
Ｈを得る。Next, as a third step, a pair of third rolls 45 composed of the inside and outside, similar to the fourth step of the first embodiment shown in FIG.
46, the third intermediate tube 1 having the same shape as that of the first embodiment shown in FIG.
Get H.
【００５０】次に、第４工程として、前記第３の中間
素管１Ｈを、前記第１実施例における図７（Ａ）に示す
第５工程と同様の内型４７とカム４８，４９を用いて
同様の成形方法により加工し、前記第１実施例における
図７（Ｂ）と同形状のリム１を得る。Next, as a fourth step, the third intermediate tube 1H is formed using the inner mold 47 and the cams 48 and 49 similar to the fifth step shown in FIG. 7A in the first embodiment. To form a rim 1 having the same shape as that shown in FIG. 7B in the first embodiment.
【００５１】本第２実施例の製造方法においては、
の工程がプレス成形を主としているため、基本的には材
料を引っ張る引っ張り加工である。In the manufacturing method of the second embodiment,
Is mainly press forming, and thus is basically a pulling process for pulling a material.
【００５２】従来のリムの製造方法において、ロール成
形でリムを製造するものにおいては、図１６に示すよう
に素管の材料を、その素管（中立線）を基準に圧縮側Ｋ
と引っ張り側Ｌの両方に加工をしている。In a conventional rim manufacturing method for manufacturing a rim by roll forming, as shown in FIG. 16, the material of the raw tube is changed on the compression side K based on the raw tube (neutral line).
And the pulling side L are processed.
【００５３】これに対し、前記第２実施例においては、
図１７に示すように、の加工が全て引っ張り側Ｌへ
の引っ張り加工であるため、前記圧縮と引っ張りの両加
工を行うものに比べて材料を低減することができ、リム
の軽量化とコスト低減を図ることができる。例えばリム
サイズ１５×６で約１０％の材料低減が可能になる。On the other hand, in the second embodiment,
As shown in FIG. 17, since all of the processes are the pulling processes to the pulling side L, the material can be reduced as compared with the process of performing both the compression and the pulling process, and the rim can be reduced in weight and cost can be reduced. Can be achieved. For example, a material reduction of about 10% becomes possible with a rim size of 15 × 6.
【００５４】また、本第２実施例においては、前記第１
実施例（図７）における第１工程と第２工程を図１
５（Ａ）に示す１つの工程で行うことができるため、
前記第１実施例（図７）の製造方法に比べて加工工程が
１工程少なくてよく、製造の効率化を図ることができ
る。In the second embodiment, the first
FIG. 1 shows the first step and the second step in the embodiment (FIG. 7).
Since it can be performed in one step shown in FIG.
The number of processing steps may be one less than that of the manufacturing method of the first embodiment (FIG. 7), and the manufacturing efficiency can be improved.
【００５５】[0055]
【発明の効果】本発明によれば、ロードノイズを低減す
る凸部をリムに形成するに当り、その凸部を容易に成形
することができる。According to the present invention, when a convex portion for reducing road noise is formed on the rim, the convex portion can be easily formed.
【００５６】また、請求項２記載の発明のように、内型
をリムの径方向の外側へ移動して凸部を成形することに
より、リムの軸方向への材料の動きがほとんどなくな
り、リムの軸方向の長さの変動がわずかですむ。すなわ
ち、仮に、型をリムの軸方向に移動して凸部を成形する
ようにすると、リムの軸方向への材料の動き量が多くな
り、その分、リムの管素材の幅方向長を広くしなければ
ならず不経済になるが、本発明のようにリムの径方向へ
の加工によって凸部を成形すると、リムの幅方向の長さ
の変動がわずかになり、前記の軸方向加工に比べて製品
コストの低減とリムの軽量化を図ることができる。Further, by moving the inner mold to the outside in the radial direction of the rim and forming the convex portion, the movement of the material in the axial direction of the rim is almost eliminated, so that the rim is hardly moved. The variation in the length in the axial direction is small. That is, if the mold is moved in the axial direction of the rim to form the convex portion, the amount of movement of the material in the axial direction of the rim increases, and the width of the rim tube material in the width direction increases accordingly. However, when the convex portion is formed by processing the rim in the radial direction as in the present invention, a change in the length of the rim in the width direction becomes small, and the above-described processing in the axial direction is performed. As a result, the product cost can be reduced and the rim can be reduced in weight.
【００５７】また、前記のように凸部を成形すると、こ
の凸部での加工度が大きいことから、他の部位の形状が
変化するおそれがある。そこで、請求項３記載のよう
に、凸部を成形した後に、リムの最終形状の成形を行う
と、振れ精度、寸法精度の高い最終形状が得られる。Further, when the convex portion is formed as described above, the shape of another portion may be changed because the degree of processing at the convex portion is large. Therefore, when the final shape of the rim is formed after the convex portion is formed, a final shape having high deflection accuracy and dimensional accuracy can be obtained.
【００５８】また、請求項４の発明のように凸部成形工
程の前段において１対の成形ロールを用いてリム全幅に
亘って所定の形状に予備成形するので、後工程である凸
部成形工程において、形状確保の容易さと板ひけ防止が
効果的に達成される。請求項５の発明のように、凸部成
形工程の前段のフレアー成形と予備成形を１回のプレス
成形で行う場合には、請求項４の発明に比べて製造工程
の短縮が可能である。また、このプレス成形が引っ張り
加工となるので材料の低減が可能である。Further, as in the fourth aspect of the present invention, in a preceding stage of the convex portion forming step, a pair of forming rolls are used to preform the entire shape of the rim into a predetermined shape. In this case, the easiness of securing the shape and the prevention of sinking are effectively achieved. In the case where the flare forming and the preliminary forming at the preceding stage of the convex forming step are performed by one press forming as in the invention of the fifth aspect, the manufacturing process can be shortened as compared with the invention of the fourth aspect. Further, since the press forming is a tensile process, the material can be reduced.
【図１】本発明の製造方法により成形されたリムにタイ
ヤを組み付けた側面図。FIG. 1 is a side view in which a tire is mounted on a rim formed by the manufacturing method of the present invention.
【図２】図１に示すリムの斜視図。FIG. 2 is a perspective view of the rim shown in FIG. 1;
【図３】図２に示すリムの側断面図。FIG. 3 is a side sectional view of the rim shown in FIG. 2;
【図４】図２に示すリムの正面図。FIG. 4 is a front view of the rim shown in FIG. 2;
【図５】図１におけるＡ−Ａ線断面図。FIG. 5 is a sectional view taken along line AA in FIG. 1;
【図６】リムのレッジ部を説明する側断面図。FIG. 6 is a side sectional view illustrating a ledge portion of a rim.
【図７】本発明の製造方法の第１実施例を示すもので、
（Ａ）は加工工程図、（Ｂ）は（Ａ）の加工によるリム
の断面形状を示す図。FIG. 7 shows a first embodiment of the production method of the present invention,
(A) is a process diagram, (B) is a diagram showing a cross-sectional shape of the rim by the process of (A).
【図８】図７における第３工程を説明する成形型の拡
大側断面図で、左半面は成形前の状態、右半面は成形後
の状態を示す。FIG. 8 is an enlarged side sectional view of a molding die for explaining a third step in FIG. 7, in which a left half surface shows a state before molding and a right half surface shows a state after molding.
【図９】図８における成形型の平面図FIG. 9 is a plan view of the molding die in FIG. 8;
【図１０】図７における第３工程で成形されたリムの
拡大断面図。FIG. 10 is an enlarged sectional view of a rim formed in a third step in FIG. 7;
【図１１】本発明と比較するための成形型を示す側断面
図で、左半面は成形前の状態、右半面は成形後の状態を
示す。FIG. 11 is a side sectional view showing a molding die for comparison with the present invention, wherein a left half surface shows a state before molding and a right half surface shows a state after molding.
【図１２】図１１の成形型により成形する場合の説明
図。FIG. 12 is an explanatory view in the case of molding with the molding die of FIG. 11;
【図１３】図７の第４工程で成形されたリムの側断面
図。FIG. 13 is a side sectional view of the rim formed in the fourth step of FIG. 7;
【図１４】図７の第３工程により成形された凸部とレッ
ジ部との長さを説明する側断面図。FIG. 14 is a side sectional view for explaining the length of the protrusion and the ledge formed in the third step of FIG. 7;
【図１５】本発明の製造方法の第２実施例を示すもの
で、（Ａ）は加工工程図、（Ｂ）は（Ａ）の加工による
リムの断面形状を示す図。FIGS. 15A and 15B show a second embodiment of the manufacturing method of the present invention, in which FIG. 15A is a processing step diagram, and FIG.
【図１６】従来のリムの成形を説明するリムの側断面
図。FIG. 16 is a side sectional view of a rim explaining a conventional rim molding.
【図１７】本発明のリムの成形を説明するリムの側断面
図。FIG. 17 is a side sectional view of the rim for explaining the molding of the rim of the present invention.
１ リム １Ａ 素管 １Ｂ〜１Ｈ 中間素管 ５ レッジ部 ６ 凸部 ３４，３５ 成形型 ３７ 凸型面 Reference Signs List 1 rim 1A raw pipe 1B to 1H intermediate raw pipe 5 ledge part 6 convex part 34, 35 molding die 37 convex surface
Claims (5)
おいて、リムの中間素管におけるレッジ部を部分的に径
方向の内側から外側へ押し出して、レッジ部の周方向に
適宜間隔を有して複数の凸部を形成する凸部成形工程を
含むことを特徴とする自動車用リムの製造方法。1. A method for manufacturing a rim for an automobile from a raw tube, wherein a ledge portion of an intermediate raw tube of the rim is partially extruded from an inner side to an outer side in a radial direction to have an appropriate space in a circumferential direction of the ledge portion. A rim forming step of forming a plurality of ridges by using a rim.
内外に凸部成形用の成形型を配置し、その内型をリムの
径方向の外側へ移動して、プレス成形により前記の凸部
を成形するようにしたことを特徴とする請求項１記載の
自動車用リムの製造方法。2. The method according to claim 2, wherein a forming die for forming the convex portion is disposed inside and outside of the intermediate material of the rim, and the inner die is moved outward in a radial direction of the rim. The method for manufacturing a rim for an automobile according to claim 1, wherein the convex portion is formed.
の成形を行うようにした請求項１又は２記載の自動車用
リムの製造方法。3. The method of manufacturing a rim for an automobile according to claim 1, wherein the final shape of the rim is formed after the step of forming the convex portion.
対の成形ロールを用いてリム全幅に亘って所定の形状に
予備成形することを特徴とする請求項１又は２又は３記
載の自動車用リムの製造方法。4. In a preceding stage after the step of forming a convex portion, 1
4. The method for manufacturing a rim for an automobile according to claim 1, wherein the rim is preformed into a predetermined shape over the entire width of the rim using a pair of forming rolls.
と予備成形を１回のプレス成形にて行うことを特徴とす
る請求項１又は２又は３又は４記載の自動車用リムの製
造方法。5. The method of manufacturing a rim for an automobile according to claim 1, wherein the flare forming and the preliminary forming in the preceding stage of the convex forming step are performed by one press forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000386755A JP4906186B2 (en) | 2000-12-20 | 2000-12-20 | Manufacturing method for automobile rim |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000386755A JP4906186B2 (en) | 2000-12-20 | 2000-12-20 | Manufacturing method for automobile rim |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002178075A true JP2002178075A (en) | 2002-06-25 |
| JP4906186B2 JP4906186B2 (en) | 2012-03-28 |
Family
ID=18853812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000386755A Expired - Fee Related JP4906186B2 (en) | 2000-12-20 | 2000-12-20 | Manufacturing method for automobile rim |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4906186B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002187405A (en) * | 2000-12-20 | 2002-07-02 | Mitsubishi Motors Corp | Rim for automobile |
| CN100398254C (en) * | 2005-09-23 | 2008-07-02 | 嘉兴市四通车轮制造有限公司 | No-seam steel felly making process |
| JP2012232605A (en) * | 2011-04-28 | 2012-11-29 | Chuo Motor Wheel Co Ltd | Automobile wheel |
| DE202015101746U1 (en) | 2015-04-01 | 2015-04-23 | Ford Global Technologies, Llc | Wheel rim with a drop center |
| DE102015205863A1 (en) | 2015-04-01 | 2016-10-06 | Ford Global Technologies, Llc | Wheel rim with a drop center |
| DE102015205864A1 (en) | 2015-04-01 | 2016-10-06 | Ford Global Technologies, Llc | Wheel rim with a drop center |
| JP2020515416A (en) * | 2017-06-08 | 2020-05-28 | 寧波徳瑪智能機械有限公司Ningbo Dema Intelligent Machinery Co., Ltd. | Floating block for wheel hub shaping mold and wheel hub shaping mold |
| CN111589929A (en) * | 2020-05-27 | 2020-08-28 | 浙江风驰机械有限公司 | Internal-supporting rim ring rolling machine |
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|---|---|---|---|---|
| JPS558914A (en) * | 1978-06-28 | 1980-01-22 | Araya Kogyo Kk | Rim and manufacture thereof |
| JPS5695438A (en) * | 1979-12-28 | 1981-08-01 | Showa Alum Corp | Hump forming method of outer rim of wheel for automobile |
| JPS6088601A (en) * | 1983-09-15 | 1985-05-18 | ミシユラン エ コムパニー（コムパニー ゼネラール デ ゼタブリツスマン ミシユラン） | Wheel rim |
| JPS6124601A (en) * | 1984-07-13 | 1986-02-03 | ミシユラン エ コムパニー（コムパニー ゼネラール デ ゼタブリツスマン ミシユラン） | Rim of single body structure |
| JPS61110402A (en) * | 1984-11-02 | 1986-05-28 | 株式会社日立製作所 | Thick film resistor |
| JPH02303640A (en) * | 1989-05-18 | 1990-12-17 | Honda Motor Co Ltd | Method and device for manufacturing wheel rim |
| JPH10137885A (en) * | 1996-11-06 | 1998-05-26 | Topy Ind Ltd | Method for rolling annular rim blank for wheel |
| JP2000271650A (en) * | 1999-03-26 | 2000-10-03 | Topy Ind Ltd | Rim shaping machine |
| JP2002187405A (en) * | 2000-12-20 | 2002-07-02 | Mitsubishi Motors Corp | Rim for automobile |
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2000
- 2000-12-20 JP JP2000386755A patent/JP4906186B2/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS558914A (en) * | 1978-06-28 | 1980-01-22 | Araya Kogyo Kk | Rim and manufacture thereof |
| JPS5695438A (en) * | 1979-12-28 | 1981-08-01 | Showa Alum Corp | Hump forming method of outer rim of wheel for automobile |
| JPS6088601A (en) * | 1983-09-15 | 1985-05-18 | ミシユラン エ コムパニー（コムパニー ゼネラール デ ゼタブリツスマン ミシユラン） | Wheel rim |
| JPS6124601A (en) * | 1984-07-13 | 1986-02-03 | ミシユラン エ コムパニー（コムパニー ゼネラール デ ゼタブリツスマン ミシユラン） | Rim of single body structure |
| JPS61110402A (en) * | 1984-11-02 | 1986-05-28 | 株式会社日立製作所 | Thick film resistor |
| JPH02303640A (en) * | 1989-05-18 | 1990-12-17 | Honda Motor Co Ltd | Method and device for manufacturing wheel rim |
| JPH10137885A (en) * | 1996-11-06 | 1998-05-26 | Topy Ind Ltd | Method for rolling annular rim blank for wheel |
| JP2000271650A (en) * | 1999-03-26 | 2000-10-03 | Topy Ind Ltd | Rim shaping machine |
| JP2002187405A (en) * | 2000-12-20 | 2002-07-02 | Mitsubishi Motors Corp | Rim for automobile |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002187405A (en) * | 2000-12-20 | 2002-07-02 | Mitsubishi Motors Corp | Rim for automobile |
| CN100398254C (en) * | 2005-09-23 | 2008-07-02 | 嘉兴市四通车轮制造有限公司 | No-seam steel felly making process |
| JP2012232605A (en) * | 2011-04-28 | 2012-11-29 | Chuo Motor Wheel Co Ltd | Automobile wheel |
| DE202015101746U1 (en) | 2015-04-01 | 2015-04-23 | Ford Global Technologies, Llc | Wheel rim with a drop center |
| DE102015205863A1 (en) | 2015-04-01 | 2016-10-06 | Ford Global Technologies, Llc | Wheel rim with a drop center |
| DE102015205864A1 (en) | 2015-04-01 | 2016-10-06 | Ford Global Technologies, Llc | Wheel rim with a drop center |
| JP2020515416A (en) * | 2017-06-08 | 2020-05-28 | 寧波徳瑪智能機械有限公司Ningbo Dema Intelligent Machinery Co., Ltd. | Floating block for wheel hub shaping mold and wheel hub shaping mold |
| US11260446B2 (en) | 2017-06-08 | 2022-03-01 | Ningbo Dema Intelligent Machinery Co., Ltd. | Floating block of hub shaping mold and hub shaping mold having same |
| CN111589929A (en) * | 2020-05-27 | 2020-08-28 | 浙江风驰机械有限公司 | Internal-supporting rim ring rolling machine |
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| Publication number | Publication date |
|---|---|
| JP4906186B2 (en) | 2012-03-28 |
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