JP2001321867A - Method for forming bolt hole in steel wheel - Google Patents
Method for forming bolt hole in steel wheelInfo
- Publication number
- JP2001321867A JP2001321867A JP2000147225A JP2000147225A JP2001321867A JP 2001321867 A JP2001321867 A JP 2001321867A JP 2000147225 A JP2000147225 A JP 2000147225A JP 2000147225 A JP2000147225 A JP 2000147225A JP 2001321867 A JP2001321867 A JP 2001321867A
- Authority
- JP
- Japan
- Prior art keywords
- punch
- diameter
- hole
- coining
- tapered
- 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、スチールホイール
におけるボルト穴の成形方法に関するものである。The present invention relates to a method for forming a bolt hole in a steel wheel.
【０００２】[0002]
【従来の技術】従来、トラック用のスチールホイールに
おいて、トラックのフロント側に装着されるスチールホ
イールは、その表側からボルト締めされるが、トラック
のリア側においては、２個のスチールホイールを夫々の
表側を重ねて裏側からボルト締めして装着される。その
ため、リア側のスチールホイールにおいては、そのボル
ト穴の両側（表裏面側）にテーパー部が形成される。2. Description of the Related Art Conventionally, in steel wheels for trucks, a steel wheel mounted on a front side of a truck is bolted from a front side thereof, but two steel wheels are respectively mounted on a rear side of the truck. It is mounted with the front side overlapped and bolted from the back side. Therefore, in the steel wheel on the rear side, tapered portions are formed on both sides (front and back sides) of the bolt hole.
【０００３】このような両側にテーパー面を有するボル
ト穴を成形する方法として、両面からテーパーパンチで
１度に成形する方法を採用すると、通常、トラック用デ
ィスク板厚がかなり厚い（通常８ｍｍ）ことから、成形
時に肉が周辺部へ逃げて、ディスクの裏面の平面度や段
差部に悪影響を与える。As a method of forming such a bolt hole having a tapered surface on both sides, if a method of forming the bolt hole at once with a tapered punch from both surfaces is adopted, the thickness of the track disk plate is usually considerably large (usually 8 mm). Therefore, the flesh escapes to the peripheral portion at the time of molding and adversely affects the flatness and the step portion on the back surface of the disk.
【０００４】そのため、従来、先ず、プレス加工にて下
穴抜き加工を行い、次で、プレス加工にて一方の片面の
テーパー加工を行い、次で、ボール盤加工にて他方の片
面のテーパー加工を行ってテーパー付ボルト穴を成形す
る方法が採用されている。[0004] Therefore, conventionally, first, a pre-drilling process is first performed by press working, then, one side taper processing is performed by press working, and then, the other side taper processing is performed by drilling. Then, a method of forming a tapered bolt hole is adopted.
【０００５】[0005]
【発明が解決しようとする課題】前記従来のように、プ
レス加工とボール盤加工による成形方法においては、ラ
インが異なる２工程となり、機械設備が嵩む上に作業能
率も悪くなり、製品コストが高くなる問題があった。As described above, in the forming method by press working and drilling work, the line has two steps which are different from each other, the machine equipment is bulky, the working efficiency is deteriorated, and the product cost is increased. There was a problem.
【０００６】そこで本発明は、前記のような両側にテー
パー面を有するボルト穴の全ての成形を、プレス加工の
１ライン上で行えるようにして前記従来の加工方法に比
べて大幅なコスト低減を図ることを目的とするものであ
る。Accordingly, the present invention enables all the above-described forming of a bolt hole having a tapered surface on both sides to be performed on one press working line, thereby achieving a significant cost reduction as compared with the conventional working method. The purpose is to achieve it.
【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、素材に抜きパンチ
とダイスにより下穴を抜き加工する第１工程と、前記成
形された下穴の表側に、先部が縮径するテーパー部を有
する上型コイニングパンチを配置し、下穴の裏側に、先
部が縮径するテーパー部を有する下型コイニングパンチ
を配して、これら両コイニングパンチによって前記下穴
の表裏にテーパー面を成形する第２工程とからなり、前
記第１工程により抜かれる下穴の径を、前記第２工程時
において穴径が小さく変動する分大きく設定したことを
特徴とするものである。According to a first aspect of the present invention, in order to solve the above-mentioned problems, a first step of punching a pilot hole in a material with a punch and a die is provided. On the front side of the prepared hole, the upper die coining punch having a tapered portion whose tip is reduced in diameter is arranged, and on the back side of the prepared hole, a lower die coining punch having a tapered portion whose tip is reduced in diameter is arranged, A second step of forming tapered surfaces on the front and back of the pilot hole by both of these coining punches, and increasing the diameter of the pilot hole removed in the first step by the amount that the hole diameter changes small in the second step. It is characterized by having been set.
【０００８】本発明においては、下穴の抜き加工を抜き
パンチとダイスで行い、該下穴の表裏（両面）のテーパ
ー加工を上下のコイニングパンチで行うようにしたの
で、この両工程が共にプレス加工で行える。そのため、
全ての加工が一連の加工工程で行える。In the present invention, the pilot hole is punched by a punch and a die, and the taper of the front and back (both sides) of the pilot hole is performed by upper and lower coining punches. It can be done by processing. for that reason,
All processing can be performed in a series of processing steps.
【０００９】請求項２記載の第２の発明は、前記第１の
発明において、前記抜きパンチを上型コイニングパンチ
側に配置し、前記上型コイニングパンチのテーパー部の
径を、前記下型コイニングパンチのテーパー部の径より
も大きく設定したものである。According to a second aspect of the present invention, in the first aspect, the punch is disposed on the side of the upper coining punch, and the diameter of the tapered portion of the upper coining punch is adjusted to the lower coining. This is set to be larger than the diameter of the tapered portion of the punch.
【００１０】本発明においては、下穴の抜き加工時にお
いて、下穴の内径に、その表側の内径が裏側の内径より
小さくなる差が生じる場合に、上型のコイニングパンチ
のテーパー部の径を、下型のコイニングパンチのテーパ
ー部の径よりも大きく設定することにより、テーパー面
の安定した加工が行える。In the present invention, the diameter of the tapered portion of the upper coining punch is reduced when the inner diameter of the prepared hole is smaller than the inner diameter of the back side when the prepared hole is punched. By setting the diameter to be larger than the diameter of the tapered portion of the lower coining punch, stable processing of the tapered surface can be performed.
【００１１】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、前記上型コイニングパンチのテ
ーパー部と下型コイニングパンチのテーパー部が、夫々
２段のテーパーで形成されているものである。According to a third aspect of the present invention, in the first or second aspect, the tapered portion of the upper coining punch and the tapered portion of the lower coining punch are each formed with a two-stage taper. Is what it is.
【００１２】本発明においては、テーパー加工時におい
て、両コイニングパンチの２段のテーパー部における夫
々の後側のテーパー部によって、テーパー加工時におけ
る余肉が前側テーパー部へ移動することを防止し、テー
パー径の安定が図られる。In the present invention, at the time of taper processing, the excess taper at the time of taper processing is prevented from moving to the front taper part by the respective rear taper parts of the two-stage taper part of both coining punches, The taper diameter is stabilized.
【００１３】[0013]
【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.
【００１４】図１は本発明によって成形加工されたトラ
ック用スチールホイールのディスク部の断面を示し、図
２はそのスチールホイールにおけるボルト穴部の拡大断
面を示す。FIG. 1 shows a cross section of a disk portion of a truck steel wheel formed according to the present invention, and FIG. 2 shows an enlarged cross section of a bolt hole portion of the steel wheel.
【００１５】この図において、１はスチールホイールの
ディスク部で、中央部にハブ穴２が形成され、その周辺
部に表裏を平面３ａ，３ｂにした平面部３が形成され、
該平面部３にボルト穴４が形成されている。該ボルト穴
４と前記ハブ穴２間は段差部５になっており、平面部３
の外周部には熱の放出と飾りを兼用する飾り穴６が形成
されている。前記ボルト穴４の表側には表側テーパー面
４ａが形成され、裏側は裏側テーパー面４ｂが形成さ
れ、更に、該両テーパー面４ａ，４ｂ間には略垂直のス
トレート部４ｃが形成されている。In FIG. 1, reference numeral 1 denotes a disk portion of a steel wheel, in which a hub hole 2 is formed at a central portion, and a flat portion 3 having flat surfaces 3a and 3b at its peripheral portion is formed.
A bolt hole 4 is formed in the flat portion 3. A step 5 is formed between the bolt hole 4 and the hub hole 2 so that the flat portion 3
A decorative hole 6 is formed in the outer peripheral portion of the device to serve both as heat release and decoration. A front side tapered surface 4a is formed on the front side of the bolt hole 4, a back side tapered surface 4b is formed on the back side, and a substantially vertical straight portion 4c is formed between the tapered surfaces 4a and 4b.
【００１６】次に、前記の両側にテーパー面を有するボ
ルト穴４の成形方法について説明する。Next, a method of forming the bolt hole 4 having the tapered surfaces on both sides will be described.
【００１７】先ず、スチールホイールの素材（被成形
板）１ａにおけるボルト穴形成位置に、図３に示すよう
に、プレス機械の抜きパンチ７と抜きダイス８とによっ
て素材１ａに下穴９をプレス加工によって抜き加工す
る。図３において１ｂは素材１ａから抜かれた片を示
す。First, as shown in FIG. 3, a pilot hole 9 is formed in a material 1a of a steel wheel material (plate to be formed) 1a by using a punch 7 and a die 8 of a press machine at a position where a bolt hole is formed. Punching. In FIG. 3, 1b indicates a piece extracted from the material 1a.
【００１８】前記抜きパンチ７と抜きダイス８とのクリ
アランスＣは、素材１ａの板厚（元厚）に対して１５〜
２０％に設定する。該クリアランスＣは、通常の抜きで
は１０％前後であるが、前記のように１５〜２０％と大
きくするのは、せん断面部９ａを減少させ、破断面部９
ｂを大きくして、抜きパンチ７の食い込み量を少なく
し、材料を引きちぎる力を増大させて、表側部に大きな
ダレ（変形）９ｃを発生させるためである。このように
ダレ９ｃを大きくする理由は、後述するテーパー加工時
において両側からテーパー加工する際に発生する加工抵
抗の差を極力なくすためである。The clearance C between the punch 7 and the die 8 is 15 to 15 times the thickness (original thickness) of the material 1a.
Set to 20%. The clearance C is about 10% in a normal cutting, but as described above, it is necessary to increase the clearance C to 15 to 20% by reducing the shear surface portion 9a and reducing the fracture surface portion 9
This is because b is increased to reduce the bite amount of the punch 7 and increase the force for tearing off the material, thereby generating a large sag (deformation) 9c on the front side. The reason for making the sag 9c large in this way is to minimize the difference in machining resistance that occurs when tapering from both sides during tapering, which will be described later.
【００１９】また、下穴９の抜き径は、ボルト穴径のノ
ミナル値＋０．５ｍｍに設定する。すなわち、図４
（ｂ）に示すボルト穴の完成品の寸法Ｌ2 に対して図４
（ａ）に示す抜き寸法Ｌ1 の関係を、Ｌ2 ＋０．５ｍｍ
＝Ｌ1 に設定する。このように下穴９の抜き寸法Ｌ1 を
完成品の寸法Ｌ2 よりも大きく設定する理由は、後述す
るテーパー加工時において、ボルト穴径が変動するた
め、この変動量分だけ下穴を大きくしておくためであ
る。この変動量は、テーパー角度や材料板厚、材料拡張
力など条件によって異なるため、実際には、これら諸条
件に適合する所定の値に設定するものである。前記の
０．５ｍｍの値は、板厚が８ｍｍでＳＡＰＨ４４０の材
料の場合の例を示したものである。The diameter of the prepared hole 9 is set to a nominal value of the bolt hole diameter +0.5 mm. That is, FIG.
Figure 4 relative to the size L 2 of the finished bolt holes shown in (b)
The relationship of the punching dimension L 1 as shown in (a), L 2 + 0.5mm
= Set to L 1. The reason for such setting increases the vent size L 1 of the lower hole 9 than finished dimension L 2, during tapering, which will be described later, since the bolt hole diameter varies, increasing the pilot hole by the variation amount It is to keep. Since the amount of the variation varies depending on conditions such as the taper angle, the material plate thickness, and the material expanding force, it is actually set to a predetermined value that meets these conditions. The value of 0.5 mm is an example in the case of a material of 8 mm in thickness and SAPH440.
【００２０】次に、図５に示すようなプレス機械の上型
コイニングパンチ１０と下型コイニングパンチ１１を用
いて前記の下穴９の表側と裏側にテーパー面をプレス加
工により成形する。Next, using the upper coining punch 10 and the lower coining punch 11 of a press machine as shown in FIG. 5, tapered surfaces are formed on the front side and the back side of the pilot hole 9 by press working.
【００２１】この上型コイニングパンチ１０は、下側に
所定径で垂直面からなるストレート部１０ａを形成し、
その上部に、上方が拡開する第１テーパー部１０ｂを形
成し、その上部（後側）に上方が拡開する第２テーパー
部１０ｃを形成した２段テーパー形状になっている。前
記ストレート部１０ａの外径は、完成品のボルト穴径に
おけるストレート部４ｃの内径と同等に設定されてい
る。更に、ストレート部１０ａの垂直方向の長さは、所
望に設定するが、最低でも０．５ｍｍに設定すると良
い。これは、その設定値が小さいと、テーパー成形時に
入り込んだ余肉が上下のコイニングパンチ１０，１１間
の隙間に入り込むおそれがあるため、これを防止するた
めにストレート部１０ａの長さを長くして余肉がストレ
ート部１０ａに当って隙間に入り込まないようにするも
のである。In the upper coining punch 10, a straight portion 10a having a predetermined diameter and a vertical surface is formed on a lower side.
The upper part has a two-stage tapered shape in which a first tapered portion 10b whose upper part expands is formed, and a second taper part 10c whose upper part expands is formed in the upper part (rear side). The outer diameter of the straight portion 10a is set to be equal to the inner diameter of the straight portion 4c in the bolt hole diameter of the finished product. Further, the length of the straight portion 10a in the vertical direction is set as desired, but is preferably set to at least 0.5 mm. This is because if the set value is small, there is a possibility that the excess material that has entered during the taper molding may enter the gap between the upper and lower coining punches 10 and 11, so that the length of the straight portion 10a is increased to prevent this. This is to prevent excess material from hitting the gap by hitting the straight portion 10a.
【００２２】また、前記第１テーパー部１０ｂにおける
テーパー角、すなわち素材１ａの表裏面に対するテーパ
ー角αは所望に設定するが、通常、トラック用のスチー
ルホイールにおいては、そのボルト穴のテーパー角が略
８０度に形成されるため、本実施例においても略８０度
に設定されている。The taper angle of the first taper portion 10b, that is, the taper angle α of the material 1a with respect to the front and back surfaces is set as desired. However, in a truck steel wheel, the taper angle of the bolt hole is generally substantially equal. Since it is formed at 80 degrees, it is set at approximately 80 degrees in this embodiment as well.
【００２３】更に、前記第２テーパー部１０ｃにおける
テーパー角βは３度程度に設定されている。Further, the taper angle β in the second tapered portion 10c is set to about 3 degrees.
【００２４】また、下型コイニングパンチ１１は、上側
に上方が拡開する第１テーパー部１１ｂを形成し、その
下部（後側）に下方が拡開する第２テーパー部１１ｃを
形成した２段テーパー形状になっている。この下型コイ
ニングパンチ１１には前記のようなストレート部は形成
されていない。The lower die coining punch 11 has a two-stage structure in which a first tapered portion 11b whose upper part expands upward is formed on the upper side, and a second taper part 11c whose lower part expands downward is formed on its lower part (rear side). It has a tapered shape. The lower portion coining punch 11 is not formed with the straight portion as described above.
【００２５】また、この第１テーパー部１１ｂのテーパ
ー角αは前記と同様に略８０°に設定され、第２テーパ
ー部１１ｃのテーパー角βは前記と同様に３度程度に設
定されている。The taper angle α of the first taper portion 11b is set to approximately 80 ° as described above, and the taper angle β of the second taper portion 11c is set to approximately 3 degrees as described above.
【００２６】そして、前記上型コイニングパンチ１０と
下型コイニングパンチ１１を用いて前記のように成形さ
れた下穴９に対して図７に示すようにプレス加工により
コイニング加工を行うと、図６及び図７に示すように、
前記下穴の抜き加工時でのせん断面部分９ａが上型コイ
ニングパンチ１０のストレート部１０ａに当ってボルト
穴４のストレート部４ｃが成形され、前記下穴の抜き加
工時でのダレ９ｃが第２テーパー部１０ｂに当って一方
の片面（表側）のテーパー面４ａが成形される。また、
下穴の抜き加工時でのダイス受け面が下型コイニングパ
ンチ１１の第１テーパー部１１ｂに当って他方の片面
（裏側）のテーパー面４ｂが成形される。更に、下穴の
抜き加工時での破断面９ｂが、上下のコイニングパンチ
１０，１１による加圧によって変形し、ストレート部４
ｃとテーパー面４ｂ間に変形部４ｄが形成される。When the lower hole 9 formed as described above is subjected to coining by press working as shown in FIG. 7 using the upper die coining punch 10 and the lower die coining punch 11, FIG. And as shown in FIG.
The sheared surface portion 9a at the time of drilling the pilot hole hits the straight portion 10a of the upper die coining punch 10 to form the straight portion 4c of the bolt hole 4, and the sag 9c at the time of drilling the pilot hole is the fourth. One tapered surface 4a on one side (front side) is formed on the 2 tapered portion 10b. Also,
The die receiving surface at the time of drilling the prepared hole hits the first tapered portion 11b of the lower die coining punch 11, and the other tapered surface 4b (back side) is formed. Further, the fractured surface 9b at the time of drilling the prepared hole is deformed by pressurization by the upper and lower coining punches 10 and 11, and
A deformed portion 4d is formed between c and the tapered surface 4b.
【００２７】なお、前記の第２テーパー面１０ｃ，１１
ｃの角度は前記のように３度程度に小さいため、製品設
計上や見た目では前記図６の形状であるが、厳密には前
記上型コイニングパンチ１０と下型コイニングパンチ１
１によるテーパー部の成形時においては、図７に示すよ
うに、第２テーパー面１０ｃ，１１ｃによって前記の表
側テーパー面４ａの表側外周と裏側テーパー面４ｂの裏
側外周に第２のテーパー面４ｅ，４ｆが成形される。こ
のように、第２テーパー面１０ｃ，１１ｃを形成する理
由は、テーパー成形時に発生する余肉がテーパー面４
ａ，４ｂへ移動しないようにして、余肉の移動によるテ
ーパー面への悪影響を防止してテーパー径の安定を図る
とともに板厚のバラツキを防止するものである。The second tapered surfaces 10c, 11
Since the angle of c is as small as about 3 degrees as described above, it has the shape of FIG. 6 in terms of product design and appearance, but strictly speaking, the upper die coining punch 10 and the lower die coining punch 1
As shown in FIG. 7, when the tapered portion is formed by the first tapered surface 1, the second tapered surfaces 10 c and 11 c form the second tapered surface 4 e on the front outer periphery of the front tapered surface 4 a and the rear outer periphery of the back tapered surface 4 b. 4f is formed. The reason for forming the second tapered surfaces 10c and 11c in this manner is that the excess thickness generated during taper molding is caused by the tapered surface 4c.
In order not to move to a and 4b, an adverse effect on the tapered surface due to the movement of the excess thickness is prevented, the taper diameter is stabilized, and the thickness variation is prevented.
【００２８】また、図５に示すように、上型コイニング
パンチ１０における第１テーパー部１０ｃの最大径Ｌ3
は下型コイニングパンチ１１における第１テーパー部１
１ｂの最大径Ｌ4 よりも大きく設定されて両者に差がも
たせてあり、具体的には上型コイニングパンチ１０側が
約０．３ｍｍ大きく設定されている。なお、この差の値
は任意である。このように差をもたせる理由は、本来、
板厚の厚いものを成形するため、プレス機械の能力が十
分であれば前記の径Ｌ3 と径Ｌ4 は同じでよい。しか
し、まず第１に、下穴抜き加工で表側と裏側では抜き穴
径に差が生じる。例えば板厚８ｍｍで表側の径は裏側の
径より３ｍｍ程小さくなる。そのため、必要成形加工力
に差が発生する。これはテーパー加工時の穴径の拡がり
率に差が生じることになる。第２に機械の能力に影響す
るが、プレス成形で１００％の成形をできない場合があ
る。これにより、隙間が生じた場合の加工は加工力の弱
い方へ押し込まれ、この場合では裏面基準、すなわち下
型コイニングパンチ１１のテーパー面側優先で加工され
る。このような理由から前記のような寸法の差をもたせ
て安定した加工を行えるようにしたものである。As shown in FIG. 5, the maximum diameter L 3 of the first tapered portion 10c in the upper die coining punch 10.
Denotes the first tapered portion 1 of the lower die coining punch 11
1b Yes and imparted a large set difference between the two even than the maximum diameter L 4 of, specifically upper die coining punch 10 side is about 0.3mm larger setting. The value of this difference is arbitrary. The reason for this difference is that
For shaping the thicker the plate thickness, the diameter L 3 and diameter L 4 of the long press machine capacity is sufficient may be the same. However, first of all, there is a difference in the diameter of the punched hole between the front side and the back side in the pre-drilling process. For example, with a plate thickness of 8 mm, the diameter on the front side is smaller by about 3 mm than the diameter on the back side. For this reason, a difference occurs in the required molding processing force. This results in a difference in the rate of expansion of the hole diameter during taper processing. Second, although it affects the performance of the machine, there are cases where 100% molding cannot be performed by press molding. As a result, the processing in the case where a gap is generated is pushed toward the weaker processing force. In this case, the processing is performed with reference to the back surface, that is, the taper surface side of the lower die coining punch 11. For these reasons, stable processing can be performed by providing the dimensional difference as described above.
【００２９】以上のように、下穴９の成形と両テーパー
面４ａ，４ｂ（厳密には４ｅ，４ｆも含む）の成形は共
にプレス加工であるため、これらを１つのプレス加工ラ
インで一連の加工が行える。As described above, the forming of the pilot hole 9 and the forming of both tapered surfaces 4a and 4b (strictly including 4e and 4f) are both press workings. Processing can be performed.
【００３０】[0030]
【発明の効果】以上のようであるから、請求項１記載の
発明によれば、下穴成形と該下穴の表裏のテーパー成形
を共にプレス加工で行えるようにして一連のプレス加工
工程で行えるようにしたので、前記従来のようにテーパ
ー成形をプレス加工と機械加工の異種の２工程で行うも
のに比べて、機械設備が安価になる上に作業能率も向上
し、製品のコスト低減を図ることができる。As described above, according to the first aspect of the present invention, both the forming of the pilot hole and the taper forming of the front and back surfaces of the pilot hole can be performed by a series of press working steps. As compared with the conventional method in which the taper forming is performed in two different steps of press working and mechanical working as in the conventional case, the machine equipment is inexpensive, the work efficiency is improved, and the cost of the product is reduced. be able to.
【００３１】請求項２記載の発明によれば、更にテーパ
ー面の安定した加工が行える。According to the second aspect of the present invention, the tapered surface can be processed more stably.
【００３２】請求項３記載の発明によれば、更にテーパ
ー径の安定を図り得る。According to the third aspect of the present invention, the taper diameter can be further stabilized.
【図１】本発明によりボルト穴を成形したスチールホイ
ールのディスク部を示す断面図。FIG. 1 is a sectional view showing a disk portion of a steel wheel in which a bolt hole is formed according to the present invention.
【図２】図１におけるボルト穴部の拡大断面図。FIG. 2 is an enlarged sectional view of a bolt hole in FIG.
【図３】本発明における下穴成形状態を示す断面図。FIG. 3 is a sectional view showing a prepared state of a pilot hole according to the present invention.
【図４】本発明における下穴径と成形されたボルト穴径
の径寸法の関係を示す断面図。FIG. 4 is a sectional view showing a relationship between a pilot hole diameter and a formed bolt hole diameter in the present invention.
【図５】本発明における上下のコイニングパンチを示す
図。FIG. 5 is a diagram showing upper and lower coining punches according to the present invention.
【図６】本発明の方法により成形されたボルト穴の見た
目での形状を示す断面図。FIG. 6 is a sectional view showing an apparent shape of a bolt hole formed by the method of the present invention.
【図７】コイニングパンチでテーパー部を成形した状態
を示し、図６のボルト穴の実際の成形形状を示す断面
図。FIG. 7 is a cross-sectional view showing a state in which a tapered portion is formed by a coining punch, and showing an actual formed shape of a bolt hole in FIG. 6;
１ａ 素材 ７ 抜きパンチ ８ ダイス ９ 下穴 １０ 上型コイニングパンチ １０ｂ，１０ｃ テーパー部 １１ 下型コイニングパンチ １１ｂ，１１ｃ テーパー部 Ｌ3 上型コイニングパンチのテーパー径 Ｌ4 下型コイニングパンチのテーパー径1a material 7 vent punch 8 die 9 lower hole 10 upper die coining punch 10b, 10c tapered portion 11 lower die coining punch 11b, tapered diameter of 11c tapered portion L 3 upper die coining taper diameter L 4 lower die coining punch punch
Claims (3)
抜き加工する第１工程と、前記成形された下穴の表側
に、先部が縮径するテーパー部を有する上型コイニング
パンチを配置し、下穴の裏側に、先部が縮径するテーパ
ー部を有する下型コイニングパンチを配して、これら両
コイニングパンチによって前記下穴の表裏にテーパー面
を成形する第２工程とからなり、前記第１工程により抜
かれる下穴の径を、前記第２工程時において穴径が小さ
く変動する分大きく設定したことを特徴とするスチール
ホイールにおけるボルト穴の成形方法。1. A first step of punching a prepared hole in a material using a punch and a die, and an upper die coining punch having a tapered portion with a reduced diameter at the front is disposed on the front side of the formed prepared hole. A second step of arranging a lower coining punch having a tapered portion with a reduced diameter at the tip on the back side of the prepared hole, and forming a tapered surface on the front and back of the prepared hole by both of the coining punches. A method of forming a bolt hole in a steel wheel, wherein a diameter of a prepared hole removed in the first step is set to be large in the second step in accordance with a small change in the hole diameter.
側に配置し、前記上型コイニングパンチのテーパー部の
径を、前記下型コイニングパンチのテーパー部の径より
も大きく設定した請求項１記載のスチールホイールにお
けるボルト穴の成形方法。2. The method according to claim 1, wherein the punch is disposed on the side of the upper coining punch, and the diameter of the tapered portion of the upper coining punch is set larger than the diameter of the tapered portion of the lower coining punch. How to form bolt holes in steel wheels.
と下型コイニングパンチのテーパー部が、夫々２段のテ
ーパーで形成されている請求項１又は２記載のスチール
ホイールにおけるボルト穴の成形方法。3. The method of forming a bolt hole in a steel wheel according to claim 1, wherein the tapered portion of the upper coining punch and the tapered portion of the lower coining punch are each formed with a two-stage taper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000147225A JP4435376B2 (en) | 2000-05-19 | 2000-05-19 | Method of forming bolt holes in steel wheels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000147225A JP4435376B2 (en) | 2000-05-19 | 2000-05-19 | Method of forming bolt holes in steel wheels |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001321867A true JP2001321867A (en) | 2001-11-20 |
| JP4435376B2 JP4435376B2 (en) | 2010-03-17 |
Family
ID=18653433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000147225A Expired - Lifetime JP4435376B2 (en) | 2000-05-19 | 2000-05-19 | Method of forming bolt holes in steel wheels |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4435376B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009127654A (en) * | 2007-11-20 | 2009-06-11 | Jatco Ltd | Torque converter and press device |
| CN102284608A (en) * | 2011-08-30 | 2011-12-21 | 扬州捷迈锻压机械有限公司 | Spoke stamping formation process |
| EP3266535A4 (en) * | 2015-03-06 | 2018-11-21 | JX Nippon Mining & Metals Corporation | Punch processing method, method of manufacturing press-formed product, and press-formed product |
| JP2019181471A (en) * | 2018-04-02 | 2019-10-24 | 株式会社アマダホールディングス | Upper metal mold for processing taper hole, metal mold set for processing taper hole, and taper female screw part manufacturing method |
| JP2019202363A (en) * | 2018-05-22 | 2019-11-28 | 肇 倉橋 | Punching plate and manufacturing method thereof |
-
2000
- 2000-05-19 JP JP2000147225A patent/JP4435376B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009127654A (en) * | 2007-11-20 | 2009-06-11 | Jatco Ltd | Torque converter and press device |
| CN102284608A (en) * | 2011-08-30 | 2011-12-21 | 扬州捷迈锻压机械有限公司 | Spoke stamping formation process |
| EP3266535A4 (en) * | 2015-03-06 | 2018-11-21 | JX Nippon Mining & Metals Corporation | Punch processing method, method of manufacturing press-formed product, and press-formed product |
| US10315240B2 (en) | 2015-03-06 | 2019-06-11 | Jx Nippon Mining & Metals Corporation | Punching processing method, method of manufacturing press-formed product, and press-formed product |
| JP2019181471A (en) * | 2018-04-02 | 2019-10-24 | 株式会社アマダホールディングス | Upper metal mold for processing taper hole, metal mold set for processing taper hole, and taper female screw part manufacturing method |
| JP7045906B2 (en) | 2018-04-02 | 2022-04-01 | 株式会社アマダ | Method of forming a tapered female thread |
| JP2019202363A (en) * | 2018-05-22 | 2019-11-28 | 肇 倉橋 | Punching plate and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4435376B2 (en) | 2010-03-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5058677B2 (en) | Method of forming hub hole flange portion of vehicle wheel | |
| JP2001321867A (en) | Method for forming bolt hole in steel wheel | |
| JP2008229710A (en) | Press blanking method | |
| JP3622062B2 (en) | Gear manufacturing method | |
| EP0925867A3 (en) | Sheet metal component and a method for manufacturing the same | |
| JP2004174542A (en) | Method for press-working metallic plate material | |
| JP3817456B2 (en) | Forging die | |
| JP2901563B2 (en) | Manufacturing method of disc for aluminum wheel | |
| US5758536A (en) | Device and method for cold forging double cylindrical pulley | |
| JP2000312924A (en) | Work corner edge molding | |
| JP2000343177A (en) | Manufacturing method of steel plate sprocket | |
| KR101480440B1 (en) | Making method of pan nut | |
| JP2004351436A (en) | Forming method and forming die | |
| JP2007130658A (en) | Press molding method | |
| JP2007196249A (en) | Method for manufacturing special shape plate member | |
| JP4316576B2 (en) | Anchor block for vehicle parking brake | |
| JPH01266936A (en) | Wheel for clock and its manufacture | |
| CN112427586A (en) | Method for improving flatness of forged shell blank | |
| JP2017006971A (en) | Manufacturing method of press working product and press working product | |
| JP2017006971A5 (en) | ||
| JPH09192773A (en) | Heading method for flange nut raw material | |
| JP4673730B2 (en) | Boss member and manufacturing method of boss member | |
| JPH0399728A (en) | Shearing die | |
| MODI et al. | Press Tool Design for Hand File Manufacturing | |
| RU2209704C1 (en) | Method for expanding blanks |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20070411 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20090811 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20090825 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20091020 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20091208 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20091224 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 4435376 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130108 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130108 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20160108 Year of fee payment: 6 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |