JP2001293528A - Hollow rack bar forming jig and die - Google Patents
Hollow rack bar forming jig and dieInfo
- Publication number
- JP2001293528A JP2001293528A JP2000111670A JP2000111670A JP2001293528A JP 2001293528 A JP2001293528 A JP 2001293528A JP 2000111670 A JP2000111670 A JP 2000111670A JP 2000111670 A JP2000111670 A JP 2000111670A JP 2001293528 A JP2001293528 A JP 2001293528A
- Authority
- JP
- Japan
- Prior art keywords
- tooth
- mandrel
- mold
- flat portion
- rack bar
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/767—Toothed racks
- B21K1/768—Toothed racks hollow
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、中空にして軽量化
された、例えば自動車のステアリング機構に使用される
ラックバーの成形用治具及び金型にかかるものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig and a mold for molding a rack bar which is hollow and lightweight, for example, used for a steering mechanism of an automobile.
【０００２】[0002]
【従来の技術】従来、自動車のステアリング機構に使用
されるラックバーは中実の棒鋼の外面に歯形を形成され
たものが使用されていた。しかし、自動車の軽量化の要
請により中空のラックバーが要請され、その簡易な製造
方法として特許第１６３８５５３号の製造方法が開示さ
れている。2. Description of the Related Art Hitherto, a rack bar used in a steering mechanism of an automobile has a tooth shape formed on an outer surface of a solid steel bar. However, a hollow rack bar is required to reduce the weight of an automobile, and a manufacturing method disclosed in Japanese Patent No. 1638553 is disclosed as a simple manufacturing method.
【０００３】この中空ラックバーは、図６に示すように
円周の一部に平面部４が形成された中空異形部を有する
管体素材３の平面部４にラック歯形５が形成されたもの
である。その製造方法として、図５に示す一次加工によ
り円周の一部に平面部４が形成された中空異形部を有す
る管体素材（以下ワークという）３を、図８に示すよう
に歯形金型７１の歯形７１ａを異形部の平面部外面に当
接させて割型６１、６１で挟んで固定する。そして、図
７に示すように異形部の平面部の内周高さＴ１よりやや
大きい高さｔ１のマンドレル８を平面部内面に圧入す
る。これにより、中空異形管の平面部の内面が押圧さ
れ、この部分の肉が盛り上がって歯形金型７１の歯形７
１ａに食い込み、平面部外面に所定のラック歯形５が成
形されるものである。This hollow rack bar is, as shown in FIG. 6, formed by forming a rack tooth profile 5 on a flat portion 4 of a tube material 3 having a hollow deformed portion in which a flat portion 4 is formed on a part of the circumference. It is. As a manufacturing method, a tube material (hereinafter referred to as a work) 3 having a hollow deformed portion in which a flat portion 4 is formed in a part of the circumference by primary processing shown in FIG. The tooth profile 71a of 71 is brought into contact with the outer surface of the flat portion of the deformed portion, and is sandwiched and fixed between the split dies 61. Then, as shown in FIG. 7, a mandrel 8 having a height t1 slightly larger than the inner peripheral height T1 of the flat portion of the deformed portion is pressed into the inner surface of the flat portion. As a result, the inner surface of the flat portion of the hollow deformed tube is pressed, and the flesh of this portion rises to form the tooth profile 7 of the tooth mold 71.
1a, and a predetermined rack tooth profile 5 is formed on the outer surface of the flat portion.
【０００４】[0004]
【発明が解決しようとする課題】従来は前記マンドレル
として、図７に示すような先端に傾斜部８ａを有するマ
ンドレルが使用された。しかしながら、このようなマン
ドレルは圧入抵抗が大きく圧入に大きな動力を有すると
共に、焼き付き・かじりを生ずることが多かった。Conventionally, a mandrel having an inclined portion 8a at the tip as shown in FIG. 7 has been used as the mandrel. However, such a mandrel has a large press-in resistance and a large power for press-fitting, and often causes seizure and galling.
【０００５】また従来は、成形金型として図８に示すよ
うに、左右対称をなす半円筒状の１対の割型６１、６１
を垂直をなす下部対向面を互いに当接し、垂直をなす上
部対向面の間に歯形７１ａを有する角杆状歯形金型７１
を挟んだ金型が用いられた。しかしながら、このような
金型ではワークの保持が十分でないという問題点があっ
た。Conventionally, as shown in FIG. 8, a pair of split dies 61, 61 each having a symmetrical semi-cylindrical shape are used as a molding die.
A square rod-shaped tooth mold 71 having vertical lower opposing surfaces in contact with each other and having a tooth shape 71a between the vertical upper opposing surfaces.
Was used. However, such a mold has a problem that the work is not sufficiently held.
【０００６】そこで本発明は、前記問題点を解決し、安
価な金型で焼き付きなどがなく中空ラックバーが製造で
きる成形治具及び金型を提供することを目的とする。Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a molding jig and a mold capable of manufacturing a hollow rack bar with a cheap mold without seizure or the like.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に本発明の中空ラックバーの成形治具は、円周の一部に
平面部が形成された中空異形部を有する管体素材の該平
面部外面に歯形金型の歯形を当接させ、該平面部内面に
マンドレルを圧入して、前記平面部の肉を盛り上げて該
平面部外面にラック歯形を形成させる中空ラックバーの
成形において、前記マンドレルには前記平面部内面に接
する突起が設けられたことを特徴とするものである。In order to achieve the above-mentioned object, a hollow rack bar forming jig according to the present invention is directed to a tube material having a hollow deformed portion in which a flat portion is formed in a part of the circumference. In the molding of a hollow rack bar in which the tooth profile of the tooth mold is brought into contact with the outer surface of the flat portion, a mandrel is pressed into the inner surface of the flat portion, and the flesh of the flat portion is raised to form a rack tooth profile on the outer surface of the flat portion. The mandrel is provided with a projection that contacts the inner surface of the flat portion.
【０００８】本発明の中空ラックバー成形治具は、図６
に示す異形管の平面部４にラック歯形５を形成させた中
空ラックバーの成形に使用するマンドレルに関するもの
である。かかる中空ラックバーは、図５に示す中空異形
部を有する管体素材（以下ワークという）３の平面部内
面に、図７に示すようにマンドレル８を圧入して、平面
部の内面の肉を歯形７１ａに食い込むように盛り上げて
ラック歯形５が成形される。この際、従来は図７に示す
ような先端部に傾斜部８ａを設けたマンドレルが用いら
れた。FIG. 6 shows a hollow rack bar forming jig of the present invention.
The present invention relates to a mandrel used for forming a hollow rack bar in which a rack tooth profile 5 is formed on a plane portion 4 of a deformed pipe shown in FIG. In such a hollow rack bar, a mandrel 8 is press-fitted as shown in FIG. 7 into a flat inner surface of a tube material (hereinafter referred to as a work) 3 having a hollow deformed portion shown in FIG. The rack tooth profile 5 is formed by being raised so as to bite into the tooth profile 71a. In this case, a mandrel having an inclined portion 8a at the tip end as shown in FIG. 7 has been conventionally used.
【０００９】本発明の中空ラックバー成形治具は、上記
マンドレルの先端に突起部を設けマンドレル自体を小径
にしたものである。これにより、図７に示す従来の先端
部に傾斜部８ａを設けたマンドレルに比し圧入抵抗が減
じ、かつ焼き付きなどが防止される。The hollow rack bar forming jig of the present invention has a small diameter of the mandrel itself by providing a projection at the tip of the mandrel. As a result, the press-in resistance is reduced as compared with the conventional mandrel in which the inclined portion 8a is provided at the distal end portion shown in FIG.
【００１０】前記マンドレルには、マンドレルの先端部
に先端から後端に向かって順次高さ大きくした２以上の
突起を設けることが望ましい。マンドレルによる成形の
際に一度に大きな加工率を与えると、ワークの焼付きや
亀裂などが生ずるので、１回の加工には適切な加工率を
与える必要がある。そこで本発明のマンドレルは、１本
のマンドレルに先端側から順次高さを大きくした２以上
の突起部を設けて、１回のマンドレルの圧入で２回以上
の加工を行うことができるようにしたものである。これ
により、加工工数が低減できると共に１回の加工率を減
してワークの亀裂などを防止できる。ここでマンドレル
の先端部とは、マンドレルの圧入する先端近傍を含むも
のである。It is preferable that the mandrel is provided with two or more protrusions whose height is sequentially increased from the front end to the rear end at the front end of the mandrel. If a large processing rate is given at a time during molding with a mandrel, seizure or cracking of the work occurs, so it is necessary to give an appropriate processing rate to one processing. Therefore, the mandrel of the present invention is provided with two or more protrusions whose heights are sequentially increased from the tip side to one mandrel, so that two or more processes can be performed by one press-fitting of the mandrel. Things. Accordingly, the number of processing steps can be reduced, and the processing rate per operation can be reduced to prevent the work from cracking. Here, the tip of the mandrel includes the vicinity of the tip of the mandrel where the mandrel is pressed.
【００１１】また本発明の中空ラックバー成形金型は、
円周の一部に平面部が形成された中空異形部を有する管
体素材の該平面部外面に歯形金型の歯形を当接させ、該
平面部内面にマンドレルを圧入して、前記平面部の肉を
盛り上げて該平面部外面にラック歯形を形成させる中空
ラックバーの成形において、前記異形部の平面部外面に
当接させる歯形を有する歯形金型と前記異形部の円筒部
外周を保持する保持金型とが、前記管体のほぼ中心線で
前記異形部の平面部に平行に軸方向に分割されたことを
特徴とするものである。Further, the hollow rack bar molding die of the present invention comprises:
A tubular member having a hollow deformed portion in which a flat portion is formed in a part of the circumference is brought into contact with a tooth shape of a tooth mold on the outer surface of the flat portion, and a mandrel is pressed into the inner surface of the flat portion to thereby form the flat portion. In forming a hollow rack bar in which the flesh is raised to form a rack tooth profile on the outer surface of the flat portion, a tooth profile mold having a tooth shape to be brought into contact with the outer surface of the flat portion of the deformed portion and the outer periphery of the cylindrical portion of the deformed portion are held. A holding mold is characterized in that the holding mold is divided in an axial direction substantially parallel to a center line of the tube and parallel to a plane portion of the deformed portion.
【００１２】即ち、本発明の中空ラックバー成形金型
は、図３及び図１（ｃ）に示すように歯形金型７と保持
金型６とを管体の中心線で異形部の平面部に平行に軸方
向に分割したものである。このように分割した金型にす
れば、歯形金型７と保持金型６の間に管体ワークを挿入
して、両金型に圧力を加えるだけで簡易・確実にワーク
を保持することができ、かつ歯形成形の際に異形部の平
面部に働く反力を確実に支えることができるので正確な
歯形を得ることができる。That is, as shown in FIGS. 3 and 1 (c), the hollow rack bar forming die of the present invention comprises a toothed die 7 and a holding die 6 which are formed in a plane part of a deformed portion at the center line of the tube. Are divided in the axial direction in parallel with. With such a divided mold, the tube work can be inserted between the tooth mold 7 and the holding mold 6 and the work can be simply and reliably held by simply applying pressure to both molds. Since it is possible to reliably support the reaction force acting on the flat portion of the deformed portion during tooth formation, an accurate tooth profile can be obtained.
【００１３】また、前記歯形金型は歯形を備えた歯形部
と該歯形部を両側から保持する台部とを組み合わせてな
ることが金型の加工を容易にし、安価に金型を製造でき
る点から望ましい。[0013] Further, the tooth mold is formed by combining a tooth part having a tooth profile and a base part holding the tooth part from both sides, thereby facilitating the processing of the mold and making it possible to manufacture the mold at low cost. Desirable.
【００１４】また、歯形金型の歯形部分は、分割歯形を
組み合わせて形成されることが型の割れを防止するため
に望ましい。即ち、管体素材の平面部の肉を歯形に盛り
上げる際には、歯間を広げる方向に力が働く。このため
に歯形金型の歯底の部分に力がかかって、この部分から
割れることが多い。そこで初めから割った分割歯形にし
た金型を組み合わせることにより歯間に弾性が生じて歯
形の割れを防止できる。この分割歯形は２歯以下の歯形
を組み合わせることが望ましい。Further, it is desirable that the tooth profile portion of the tooth profile mold is formed by combining divided tooth profiles in order to prevent cracking of the mold. That is, when the flesh of the flat portion of the tubular body material is raised into a tooth shape, a force acts in a direction to widen between teeth. For this reason, a force is applied to the bottom portion of the tooth mold and the portion often breaks from this portion. Therefore, by combining a mold with a split tooth profile that is split from the beginning, elasticity is generated between the teeth, and cracks in the tooth profile can be prevented. It is desirable to combine two or less tooth profiles in this divided tooth profile.
【００１５】[0015]
【発明の実施の形態】以下、本発明を図示の一実施形態
について具体的に説明する。図１（ｂ）は本発明第１実
施形態の中空ラックバーの成形治具のマンドレルの側面
図及び金型の断面図、図１（ａ）は第１実施形態のマン
ドレルの突起部の断面図、図１（ｃ）は本発明実施形態
の金型の断面図、図２（ｂ）は本発明第２実施形態の中
空ラックバーの成形治具のマンドレルの側面図及び金型
の断面図、図２（ａ）は第２実施形態のマンドレルの突
起部の断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings. 1B is a side view of a mandrel of a molding jig for a hollow rack bar according to a first embodiment of the present invention and a cross-sectional view of a mold. FIG. 1A is a cross-sectional view of a protrusion of the mandrel of the first embodiment. FIG. 1C is a cross-sectional view of a mold according to the embodiment of the present invention, and FIG. 2B is a side view and a cross-sectional view of the mold of the jig for forming a hollow rack bar according to the second embodiment of the present invention. FIG. 2A is a cross-sectional view of the protrusion of the mandrel according to the second embodiment.
【００１６】図１の第１実施形態のマンドレル８１は竿
部８３の先端部８２に突起８２ａが設けられている。突
起８２ａの断面は、図１（ａ）に示すように平面部内面
とほぼ相似の形状をなし、その高さｔ1 が平面部内面の
高さＴよりやや大きくされている。突起８２ａは超硬肉
盛り溶接などにより容易に成形できるが、機械加工によ
り成形してもよい。竿部８３の断面は図１（ａ）に示す
ように高さがｔ1 より小さい平面部内面とほぼ相似形状
でもよいし、楕円あるいは円形棒でもよい。The mandrel 81 of the first embodiment shown in FIG. 1 is provided with a projection 82a at the tip 82 of a rod 83. Cross-section of the projection 82a is a substantially similar shape as the flat inner surface, as shown in FIG. 1 (a), the height t 1 is slightly larger than the height T of the flat inner surface. The projection 82a can be easily formed by super hard overlay welding or the like, but may be formed by machining. The cross section of the rod portion 83 may be substantially similar to the inner surface of the flat portion whose height is smaller than t 1 as shown in FIG. 1A, or may be an elliptical or circular rod.
【００１７】このように突起を設け、この突起でワーク
の平面部内面に接するようにすることにより、図７に示
す従来の先端に傾斜部を設けたマンドレルよりも圧入圧
力を小さくすることができる。また、潤滑を良くし焼付
きを防止できるので１回の加工率も大きくでき工数が低
減できる。さらに突起が摩耗したときに、肉盛り溶接な
どで容易に補修できるのでマンドレルの寿命を増しコス
トを低減できる。By providing the projections in this way and making contact with the inner surface of the flat portion of the work with the projections, the press-fitting pressure can be made smaller than that of the conventional mandrel shown in FIG. . In addition, since the lubrication can be improved and seizure can be prevented, the processing rate per operation can be increased and the number of steps can be reduced. Further, when the projection is worn, it can be easily repaired by overlay welding or the like, so that the life of the mandrel can be increased and the cost can be reduced.
【００１８】図２の第２実施形態のマンドレル８１´
は、竿部８３´の先端部８２´に２つの突起８２ｂ，８
２ｃが設けられた形状をなしている。図２（ａ）に示す
突起８２ｂ，８２ｃの断面は図１（ａ）と同様に、それ
ぞれの高さｔ2 、ｔ3 が平面部内面の高さＴよりやや大
きい平面部内面とほぼ相似の形状をなしており、マンド
レル先端に近い突起８２ｂの高さｔ2 より遠い突起８２
ｃの高さｔ3 の方が大きくされている。突起８２ｂ，８
２ｃの成形方法、竿部８３の断面は第１実施形態と同様
である。The mandrel 81 'of the second embodiment shown in FIG.
Are two projections 82b, 8 on the tip 82 'of the rod 83'.
2c is provided. The cross section of the projections 82b and 82c shown in FIG. 2A is substantially similar to the inner surface of the plane portion, in which the heights t 2 and t 3 are slightly larger than the height T of the inner surface of the plane portion, similarly to FIG. and a shape, farther than the height t 2 close to the mandrel projecting end 82b projecting 82
The height t 3 of c is larger. Projections 82b, 8
The molding method of 2c and the cross section of the rod portion 83 are the same as in the first embodiment.
【００１９】このように１本のマンドレルに２個の突起
を設けることにより、マンドレルの圧入回数を減らすこ
とができ、工数が低減できる。また、この突起は２個の
みでなく３個以上でもよい。By providing two projections on one mandrel, the number of press-fitting of the mandrel can be reduced, and the number of man-hours can be reduced. The number of the protrusions is not limited to two, but may be three or more.
【００２０】図３は本発明実施形態の金型の斜視図、図
４は歯形部の斜視図である。なお、図１（ｃ）に同金型
の断面図を示す。これらの図において、金型１０はワー
ク（管体）１の中心線で異形部の平面部４に平行に軸方
向に分割された保持金型６と歯形金型７とからなる。FIG. 3 is a perspective view of a mold according to the embodiment of the present invention, and FIG. 4 is a perspective view of a tooth profile. FIG. 1C shows a cross-sectional view of the same mold. In these figures, a mold 10 comprises a holding mold 6 and a tooth mold 7 which are divided in the axial direction in parallel with the plane part 4 of the deformed part at the center line of the work (tube) 1.
【００２１】保持金型６は、ワーク１の異形部の円筒部
４ｂの外周とほぼ同径の半円の溝６ａが軸方向に形成さ
れている。歯形金型７は、歯形７ｃを有する歯形部７ａ
の両側を台部７ｂで挟んで図示しない任意の方法で一体
に固定されて形成される。また、歯形部７ａは図４に示
すように２歯づつの分割された金型が縦に組み合わされ
て図示しない任意の方法で両側が拘束されている。In the holding die 6, a semicircular groove 6a having substantially the same diameter as the outer periphery of the cylindrical portion 4b of the deformed portion of the work 1 is formed in the axial direction. The tooth mold 7 has a tooth profile 7a having a tooth profile 7c.
Are fixed integrally by an arbitrary method (not shown) with both sides of the base sandwiched by the base 7b. Further, as shown in FIG. 4, the mold 7a is vertically combined with divided molds each having two teeth and both sides are restrained by an arbitrary method (not shown).
【００２２】上記構成の金型によれば、保持金型６の溝
６ａにワークの異形部円筒部を挿入して、歯形７ｃが異
形部平面部に当接するようにして歯形金型７を合わせれ
ば、容易に保持金型６と歯形金型７の間にワークを固定
できる。According to the above-described mold, the profiled cylindrical portion of the work is inserted into the groove 6a of the holding mold 6, and the tooth profile mold 7 is fitted so that the tooth profile 7c abuts on the profiled portion flat portion. In this case, the work can be easily fixed between the holding mold 6 and the tooth mold 7.
【００２３】以下、上記構成の本発明の成形治具及び金
型の作用について説明する。図５に示す円周の一部に平
面部４を有する断面形状の異形部が成形されたワーク
（１次成形体）１を、その平面部外面がラック歯形７ｃ
に当接するようにして歯形金型７に挿入する。その上に
保持金型６を被せてワーク１を歯形金型７と保持金型６
との間に挟んで図示しない固定手段により固定する。こ
の状態で、図１に示すように突起８２ａの高さｔ1 が平
面部４の内面高さＴより大きいマンドレル８１をワーク
（１次成形体）１の内部に圧入する。すると、マンドレ
ル８１の突起８２ａにより平面部４の肉が押し上げら
れ、歯形金型７の歯形７ｃに食い込んで平面部４の外面
に図６に示すようなラック歯形５が形成される。Hereinafter, the operation of the molding jig and the metal mold of the present invention having the above-described structures will be described. A workpiece (primary molded body) 1 in which a deformed portion having a cross-sectional shape having a flat portion 4 on a part of the circumference shown in FIG.
Is inserted into the tooth mold 7 in such a manner as to come into contact therewith. The work 1 is put on the holding mold 6 and the tooth mold 7 and the holding mold 6 are placed thereon.
And fixed by fixing means (not shown). In this state, as shown in FIG. 1, a mandrel 81 in which the height t 1 of the projection 82 a is larger than the inner surface height T of the flat portion 4 is pressed into the inside of the work (primary molded body) 1. Then, the flesh of the flat part 4 is pushed up by the projection 82 a of the mandrel 81, bites into the tooth form 7 c of the tooth mold 7, and the rack tooth form 5 as shown in FIG. 6 is formed on the outer surface of the flat part 4.
【００２４】図２に示す２つの突起８２ｂ，８２ｃを有
する場合には、高さｔ2 の小さい先端側の突起８２ｂで
平面部４の肉を押し上げた後、さらに次の高さｔ3 の大
きい突起８２ｃで肉を押し上げるので、１回のマンドレ
ルの圧入で２回の加工を行うことができる。The two projections 82b shown in FIG. 2, if it has a 82c, after pushing up the flesh of the flat portion 4 at a height t 2 small tip side of 82b, larger in the next height t 3 Since the meat is pushed up by the projections 82c, two processes can be performed by one press-fitting of the mandrel.
【００２５】以上説明したように本発明実施形態の中空
ラックバー成形治具によれば、平面部内面に圧入するマ
ンドレルに異形部の平面部の内面に接する突起が設けら
れているので、従来の先端に傾斜部のみ設けたマンドレ
ルに比し、圧入抵抗を大幅に減少でき、かつ肉の盛り上
げる効率を向上でき加工率を大きくできる。As described above, according to the hollow rack bar forming jig of the embodiment of the present invention, since the mandrel press-fitted into the inner surface of the flat portion is provided with the projection which is in contact with the inner surface of the flat portion of the deformed portion, the conventional jig is provided. Compared to a mandrel having only a slope at the tip, the press-in resistance can be greatly reduced, the efficiency of raising the meat can be improved, and the processing rate can be increased.
【００２６】また、マンドレルの先端部から順次高さを
大きくした２個の突起部を設けることにより、一本のマ
ンドレルの圧入による加工量を２倍にできるので、マン
ドレルを切り換えて圧入する回数を半分にすることがで
き作業能率が向上する。さらに、この突起を３以上設け
れば一層作業能率を向上できる。Further, by providing two protrusions whose heights are sequentially increased from the tip of the mandrel, the amount of processing by press-fitting one mandrel can be doubled, so that the number of times of switching the mandrel and press-fitting can be reduced. Work efficiency can be improved by halving. Further, if three or more projections are provided, the work efficiency can be further improved.
【００２７】また、本発明の中空ラックバーの成形金型
は、歯形金型と保持金型とが異形部の平面部に平行にワ
ークの中心線で分割されているので、保持金型で異形部
の円筒部の外周を保持し、歯形金型で異形部の平面部を
保持すると共に平面部の外面に歯形を当接させるので、
ワークを確実に保持すると共に前記平面部の肉が盛り上
がる力に対向して保持することが容易であるので、正確
なラック歯形の成形作業が容易かつ能率良くできる。In the molding die for a hollow rack bar according to the present invention, since the tooth mold and the holding die are divided by the center line of the workpiece in parallel with the plane portion of the deformed portion, the holding die is deformed. Since the outer periphery of the cylindrical part of the part is held, and the flat part of the deformed part is held by the tooth mold, and the tooth shape is brought into contact with the outer surface of the flat part,
Since it is easy to hold the work securely and to hold the work in opposition to the force by which the flesh of the flat portion rises, accurate rack tooth forming work can be performed easily and efficiently.
【００２８】この歯形金型は歯形を備えた歯形部と、両
側から保持する台部とを組み合わせて形成し、かつ歯形
部を２歯以下の分割歯形を組み合わせて形成するように
すれば、加工が容易になると共に、歯形部の長さ方向に
弾性を与えることができて歯形部の破損を防止でき、か
つ摩耗部のみを取り替えることにより金型の原価を低減
できる。If the tooth profile mold is formed by combining a tooth profile portion having a tooth profile with a pedestal portion to be held from both sides, and the tooth profile portion is formed by combining two or less divided tooth profiles, processing is possible. Can be easily performed, elasticity can be given in the length direction of the tooth profile, damage to the tooth profile can be prevented, and the cost of the mold can be reduced by replacing only the worn portion.
【００２９】[0029]
【発明の効果】以上説明したように、本発明の中空ラッ
クバーの成形治具及び金型によれば、安価に中空ラック
バーの量産ができるので、材料の節約による省資源を達
成でき、また自動車などの軽量化に寄与して省エネルギ
に貢献できる。As described above, according to the hollow rack bar forming jig and the metal mold of the present invention, the hollow rack bar can be mass-produced inexpensively, so that resources can be saved by saving materials. It can contribute to energy saving by contributing to weight reduction of automobiles.
【図１】本発明第１実施形態の中空ラックバー成形治具
のマンドレルの図及び成形金型の断面図である。FIG. 1 is a view of a mandrel of a hollow rack bar forming jig according to a first embodiment of the present invention and a sectional view of a forming die.
【図２】本発明第２実施形態の中空ラックバー成形治具
のマンドレルの図及び成形金型の図である。FIG. 2 is a diagram of a mandrel and a diagram of a molding die of a hollow rack bar molding jig according to a second embodiment of the present invention.
【図３】本発明実施形態の中空ラックバー成形金型の斜
視図である。FIG. 3 is a perspective view of a hollow rack bar molding die according to the embodiment of the present invention.
【図４】本発明実施形態の中空ラックバー成形金型の歯
形部の斜視図である。FIG. 4 is a perspective view of a tooth profile of the hollow rack bar molding die according to the embodiment of the present invention.
【図５】本発明実施形態の中空ラックバーの１次成形体
（ワーク）の斜視図である。FIG. 5 is a perspective view of a primary formed body (work) of the hollow rack bar according to the embodiment of the present invention.
【図６】本発明実施形態の中空ラックバー成形体の斜視
図である。FIG. 6 is a perspective view of a hollow rack bar molded body according to the embodiment of the present invention.
【図７】従来の中空ラックバー成形に使用されるマンド
レルの形状を示す図である。FIG. 7 is a view showing the shape of a mandrel used for conventional hollow rack bar molding.
【図８】従来の中空ラックバー成形金型の１例の側面図
である。FIG. 8 is a side view of an example of a conventional hollow rack bar molding die.
１ ワーク（１次成形体）、２ 中空ラックバー、３
鋼管（管体）、４ 平面部、４ｂ 円周部、５ 歯形、
６ 保持金型、６ａ 半円溝、７ 歯形金型、７ａ 歯
形部、７ｂ 台部、７ｃ 歯形、８ マンドレル、８ａ
傾斜部、６１割型、７１ 歯形金型、７１ａ 歯形、
８１、８１´ マンドレル、８２、８２´ 先端部、８
２ａ，８２ｂ，８２ｃ 突起1 work (primary molded body), 2 hollow rack bar, 3
Steel pipe (tube body), 4 flat part, 4b circumferential part, 5 tooth shape,
6 holding mold, 6a semi-circular groove, 7 tooth mold, 7a tooth shape part, 7b base part, 7c tooth shape, 8 mandrel, 8a
Inclined part, 61% mold, 71 tooth mold, 71a tooth shape,
81, 81 'mandrel, 82, 82' tip, 8
2a, 82b, 82c Projection
Claims (5)
形部を有する管体素材の該平面部外面に歯形金型の歯形
を当接させ、該平面部内面にマンドレルを圧入して、前
記平面部の肉を盛り上げて該平面部外面にラック歯形を
形成させる中空ラックバーの成形において、前記マンド
レルには前記平面部内面に接する突起が設けられたこと
を特徴とする中空ラックバー成形治具。1. A tubular material having a hollow deformed portion in which a flat portion is formed in a part of the circumference is brought into contact with a tooth profile of a tooth mold on the outer surface of the flat portion, and a mandrel is pressed into the inner surface of the flat portion. And forming a rack tooth profile on the outer surface of the flat portion by raising the flesh of the flat portion, wherein the mandrel is provided with a protrusion that contacts the inner surface of the flat portion. Molding jig.
部に先端から後端に向かって順次高さを大きくした２以
上の突起が設けられたことを特徴とする請求項１に記載
の中空ラックバー成形治具。2. The hollow rack bar according to claim 1, wherein the mandrel is provided with two or more protrusions whose heights are sequentially increased from a front end to a rear end at a front end portion of the mandrel. Molding jig.
形部を有する管体素材の該平面部外面に歯形金型の歯形
を当接させ、該平面部内面にマンドレルを圧入して、前
記平面部の肉を盛り上げて該平面部外面にラック歯形を
形成させる中空ラックバーの成形において、前記異形部
の平面部外面に当接させる歯形を有する歯形金型と前記
異形部の円筒部外周を保持する保持金型とが、前記管体
のほぼ中心線で前記異形部の平面部に平行に軸方向に分
割されたことを特徴とする中空ラックバー成形金型。3. A tubular body having a hollow deformed portion having a flat portion formed on a part of a circumference thereof, a tooth shape of a tooth mold is brought into contact with an outer surface of the flat portion, and a mandrel is pressed into an inner surface of the flat portion. In molding a hollow rack bar in which the flesh of the flat portion is raised to form a rack tooth profile on the outer surface of the flat portion, a tooth mold having a tooth shape to be brought into contact with the outer surface of the flat portion of the deformed portion, and a cylinder of the deformed portion A mold for forming a hollow rack bar, wherein a holding mold for holding an outer periphery of the hollow rack bar is divided in an axial direction substantially at a center line of the tube and parallel to a plane portion of the deformed portion.
部と該歯形部を両側から保持する台部とを組み合わせて
なることを特徴とする請求項３に記載の中空ラックバー
成形金型。4. The hollow rack bar molding die according to claim 3, wherein the tooth profile mold is formed by combining a tooth profile with the tooth profile and a base that holds the tooth profile from both sides. Type.
組み合わせて形成されることを特徴とする請求項４に記
載の中空ラックバー成形金型。5. The hollow rack bar molding die according to claim 4, wherein the tooth profile portion of the tooth profile die is formed by combining divided tooth profiles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000111670A JP2001293528A (en) | 2000-04-13 | 2000-04-13 | Hollow rack bar forming jig and die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000111670A JP2001293528A (en) | 2000-04-13 | 2000-04-13 | Hollow rack bar forming jig and die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001293528A true JP2001293528A (en) | 2001-10-23 |
Family
ID=18623962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000111670A Pending JP2001293528A (en) | 2000-04-13 | 2000-04-13 | Hollow rack bar forming jig and die |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001293528A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008264873A (en) * | 2007-03-27 | 2008-11-06 | High Frequency Heattreat Co Ltd | Core bar and hollow rack bar |
| US8365573B2 (en) | 2007-02-23 | 2013-02-05 | Neutron Co., Ltd. | Mandrel, set of mandrels, and hollow rack bar |
| JP2016025221A (en) * | 2014-07-22 | 2016-02-08 | 日産自動車株式会社 | Molding device for uneven molding |
-
2000
- 2000-04-13 JP JP2000111670A patent/JP2001293528A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8365573B2 (en) | 2007-02-23 | 2013-02-05 | Neutron Co., Ltd. | Mandrel, set of mandrels, and hollow rack bar |
| US9046157B2 (en) | 2007-02-23 | 2015-06-02 | Neturen Co., Ltd. | Mandrel, set of mandrels, and hollow rack bar |
| JP2008264873A (en) * | 2007-03-27 | 2008-11-06 | High Frequency Heattreat Co Ltd | Core bar and hollow rack bar |
| JP2016025221A (en) * | 2014-07-22 | 2016-02-08 | 日産自動車株式会社 | Molding device for uneven molding |
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