JPS60221143A - Manufacture of rack shaft of rack and pinion steering gear - Google Patents
Manufacture of rack shaft of rack and pinion steering gearInfo
- Publication number
- JPS60221143A JPS60221143A JP7808584A JP7808584A JPS60221143A JP S60221143 A JPS60221143 A JP S60221143A JP 7808584 A JP7808584 A JP 7808584A JP 7808584 A JP7808584 A JP 7808584A JP S60221143 A JPS60221143 A JP S60221143A
- Authority
- JP
- Japan
- Prior art keywords
- rack
- steel pipe
- tube
- forming
- rack shaft
- 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
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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は自動車等の車両用のラックピニオン式舵取装笥
のラック軸の製造方法、特に、電縫管等の電気溶接管に
よるラック軸の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a rack shaft of a rack and pinion type steering rack for a vehicle such as an automobile, and more particularly to a method of manufacturing a rack shaft using an electrically welded pipe such as an electric resistance welded pipe.
この種のラックピニオン式舵取装置のラック軸の素材鋼
管として継目なし鋼管を使用しているラック軸及びその
製造方法が種々提案されているが、この継目なし鋼管は
、製管時に生じる偏肉により均一な肉厚を得難く、又薄
肉のものは製造」二困難が伴うため、比較的厚肉のもの
を使用しなくてはならず、ラック軸の重量を軽減するこ
とができない。又、製造コストが高くなるという問題点
があった。そこで、本発明者は、肉厚が均一であり、薄
肉鋼管を能率良く製管可能で、さらに製造コストが低廉
な電縫管等の電気溶接管を素材鋼管として使用すること
を試みた。Various rack shafts and manufacturing methods have been proposed in which seamless steel pipes are used as the material steel pipe for the rack shaft of this type of rack and pinion steering device. It is difficult to obtain a uniform wall thickness, and thin-walled racks are difficult to manufacture, so relatively thick-walled racks must be used, making it impossible to reduce the weight of the rack shaft. Further, there was a problem that the manufacturing cost was high. Therefore, the present inventor attempted to use an electrically welded pipe such as an electric resistance welded pipe, which has a uniform wall thickness, can efficiently manufacture thin-walled steel pipes, and is inexpensive to manufacture, as a material steel pipe.
しかしながら、前記電気溶接管は内孔に製管時に生じる
溶接跡が突出しているため、ラック軸を製造する上で曲
題点があった。However, the electrically welded pipe has a protruding welding mark formed in the inner hole during pipe manufacturing, which poses a problem in manufacturing the rack shaft.
その問題点とは、鋼管内孔に芯金を挿入して成形パンチ
によって鋼管外周面の一部に平坦部又は歯形粗形状を成
形する製造工程において、前記鋼管内孔に突出した溶接
跡を芯金の背面すなわち成形パンチに対向する面の反対
側に位置させた場合、芯金の挿入が困難であり、又芯金
背面に前記溶接跡が当たった状態で成形するため、正確
な形状を成形できず、又芯金の背面を損傷してしまう。The problem is that in the manufacturing process where a core metal is inserted into the inner hole of the steel pipe and a forming punch is used to form a flat part or a rough tooth shape on a part of the outer circumferential surface of the steel pipe, the weld marks protruding into the inner hole of the steel pipe are removed from the core. If the core metal is placed on the back side of the metal, that is, on the opposite side of the surface facing the forming punch, it is difficult to insert the core metal, and since the welding traces are in contact with the back side of the metal core, it is difficult to form the exact shape. Otherwise, the back side of the core metal will be damaged.
又、前記溶接跡を前記芯金の成形パンチに対向する側に
位置させた場合、前記鋼管の溶接継目部は溶接熱に凄り
組織変化して硬化しているため、成形パンチによる成形
時に、割れを生じる恐れがある。又、切削加工によって
ラック歯を形成する場合、硬化している溶接継目部を切
削しなければならないため、切削刃物の寿命を著しく低
下させ、製造コストを高めるという問題点がある。In addition, when the welding trace is located on the side of the core bar facing the forming punch, the welded joint of the steel pipe undergoes a severe structural change and hardens due to the welding heat, so when forming with the forming punch, There is a risk of cracking. Furthermore, when forming the rack teeth by cutting, it is necessary to cut the hardened weld seam, which poses the problem of significantly shortening the life of the cutting tool and increasing manufacturing costs.
本発明は上記の問題点を解決することによって、内孔に
突出した溶接跡を残した電縫管等の電気溶接管で実用的
にラックピニオン式舵取装置のラック軸を製造すること
ができる製造方法を提供することを目的とする。By solving the above-mentioned problems, the present invention makes it possible to practically manufacture the rack shaft of a rack and pinion type steering device using an electrically welded pipe such as an electric resistance welded pipe that leaves protruding weld marks in the inner hole. The purpose is to provide a manufacturing method.
以下本発明の実施例を示す図面に基づき本発明を説明す
る。The present invention will be described below based on drawings showing embodiments of the present invention.
第１図は本発明実施例の成形前の状態を示す。FIG. 1 shows the state of the embodiment of the present invention before molding.
（１）は、軸方向に延びる溶接継目部（２）の内側に突
出した溶接跡（３）を残した電縫管等の電気溶接管であ
り、これを素材鋼管として、下型（４）の円弧面（５）
上に置き、成形パンチ（１２）と対向する平坦面（６）
と鋼管内孔に係合する円弧状の背面（７）とを有し、そ
の背面（７）に長手方向に延びる逃げ溝（８）を有する
芯金（９）を、その逃げ溝＼８）の位置に溶接跡（３）
を位置させて挿入し、前記電気′溶接管（１）を上型（
１０）の円弧状（１１） （１１）によって上方から押
付固定する。その上型（１０）には、前記電気溶接管（
１）の外周面の所定位置に平坦部又は歯形粗形状を成形
する成形パンチ（１２）の案内孔（１３）が形成されて
いる。次に第２図に示す如く、前記上型（１０）の案内
孔（１３）を往復動する成形パンチ（１２）によって前
記電気溶接管（１）の外周面の所定位置に平坦部又は歯
形粗形状を成形する。その成形後、上記装置から電気溶
接管（１）を取り出して、第３図に示す如く、前記電気
溶接管外周面の平坦部又は歯形粗形状部に歯切り、ブロ
ーチ加工等の切削加工又は転造加工などによってラック
歯（１４）の歯形仕上げ加工を施す。(1) is an electrically welded pipe such as an electric resistance welded pipe with a protruding weld mark (3) on the inside of the welded joint (2) extending in the axial direction, and this is used as a material steel pipe to form a lower mold (4). Arc surface (5)
A flat surface (6) placed on top and facing the forming punch (12)
and an arc-shaped back surface (7) that engages with the inner hole of the steel pipe, and a core bar (9) having a relief groove (8) extending in the longitudinal direction on the back surface (7), and a relief groove \8). Welding marks at the position (3)
and insert the electrically welded pipe (1) into the upper mold (
10) Press and fix from above using the arc shape (11) (11). The upper mold (10) has the electrically welded pipe (
A guide hole (13) for a forming punch (12) for forming a flat portion or a rough tooth shape is formed at a predetermined position on the outer circumferential surface of 1). Next, as shown in FIG. 2, a flat part or tooth profile roughness is formed at a predetermined position on the outer peripheral surface of the electric welding pipe (1) by a forming punch (12) reciprocating through the guide hole (13) of the upper die (10). Mold the shape. After the shaping, the electric welding tube (1) is taken out from the above-mentioned apparatus, and as shown in FIG. The tooth profile of the rack teeth (14) is finished by shaping or the like.
尚、上記実施例の第１図に示す状態において、芯金（９
）を回転可能とし、電縫管等の電気溶接管を下型（４）
の円弧面（５）上に任意の向きで置き、その鋼管内孔に
突出した溶接跡（３）に芯金（９）の逃げ溝（８）を位
置させて挿入し、その芯金（９）を回転させて、その芯
金（９）の逃げ溝（８）に引掛る溶接跡（３）により、
前記鋼管を回転させて、￥形位置を決め、その後成形パ
ンチによって鋼管外周面の一部に平坦部又は歯形粗形状
を成形することもできる。In addition, in the state shown in FIG. 1 of the above embodiment, the core metal (9
) is rotatable, and the lower mold (4)
Place the core metal (9) in any direction on the arcuate surface (5) of the steel pipe, position the clearance groove (8) of the core metal (9) in the welding trace (3) protruding into the inner hole of the steel pipe, and insert the core metal (9). ), the welding trace (3) caught in the relief groove (8) of the core metal (9),
It is also possible to rotate the steel pipe to determine the circular position, and then use a forming punch to form a flat portion or a rough tooth shape on a part of the outer peripheral surface of the steel pipe.
尚、前記電気溶接管は外周面を引抜加工等による仕上げ
加工を施したものが望ましい。又、前記芯金の背面に設
けられた逃げ溝の位置は、成形パンチによる加工成形時
の荷重に対する芯金の強度バランスを確保するため、背
面の略中夫に設けることが好ましい。The electrically welded pipe preferably has its outer circumferential surface finished by drawing or the like. Further, it is preferable that the relief groove provided on the back surface of the core metal is provided approximately at the center of the back surface in order to ensure the strength balance of the core metal against the load during processing and forming with a forming punch.
又、前記平坦部又は歯形粗形状の成形加工は、冷間、温
間、熱間のいづれの状態においてプレス成形を施こして
もよいが、冷間状態によってプレス成形を施せば、電気
溶接管外周面に酸化被膜（スケール）などを生じること
がないため、その後の加工形成を比較的簡単にすること
ができる。Further, the forming process of the flat part or rough tooth shape may be performed by press forming in cold, warm, or hot conditions, but if press forming is performed in cold conditions, electric welded pipes can be formed. Since no oxide film (scale) is formed on the outer peripheral surface, subsequent processing and formation can be made relatively simple.
以上の如く、本発明は内孔に突出した溶接跡を残した電
縫管等の電気溶接管を素材鋼管として、その鋼管内孔に
、その背面に長手方向に延びる逃げ溝を有する芯金を挿
オいて、成形パンチによって鋼管外周面の一部に平坦部
又は歯形粗形状を成形し、その後歯形仕上げ加工を施す
製造方法であるので、電縫管等の電気溶接管の溶接継目
部内側に突出した溶接跡を残したままで、鋼管内孔に芯
金をスムーズに所定位置に挿入することができ、芯金の
背面に溶接跡が接触することがなくなり、鋼管外周面の
一部に正確な平坦部又は歯形粗形状を成形できる。又芯
金を損傷することもなく、芯金寿命を向上させることが
できる。又、鋼管の溶接跡は必ず芯金の背面側に位置さ
れ、被成形部分にくることがないので成形パンチによる
成形時に溶接継目部の割れを生じる恐れも解消され、又
、切削加工によってラック歯を形成しても切削刃物の寿
命を低下させることもなく、製造コストを高めることも
ない。さらに、肉厚が均一であり、薄肉鋼管を能率良く
製管可能で製造コストの低層な電気溶接管で実用的に製
造することができる。As described above, the present invention uses an electrically welded pipe such as an electric resistance welded pipe that leaves a protruding welding mark in the inner hole as a material steel pipe, and a core metal having a relief groove extending in the longitudinal direction on the back surface of the steel pipe inner hole. This is a manufacturing method in which a flat part or a rough tooth shape is formed on a part of the outer peripheral surface of the steel pipe using a forming punch, and then the tooth shape is finished. The core metal can be smoothly inserted into the specified position in the inner hole of the steel pipe while leaving a protruding weld mark, and the weld mark does not come into contact with the back of the core metal. Flat parts or rough tooth shapes can be formed. Further, the life of the core metal can be improved without damaging the core metal. In addition, the weld marks on the steel pipe are always located on the back side of the metal core and never on the part to be formed, which eliminates the risk of cracking at the weld joint when forming with a forming punch. The formation of this will neither reduce the life of the cutting tool nor increase manufacturing costs. Furthermore, the wall thickness is uniform, and thin-walled steel pipes can be efficiently produced, making it possible to practically manufacture electric welded pipes with low manufacturing costs.
第１図、第２図、第３図は本発明の実施例を示す断面図
であり、第１図は成形前の状態を示す断面図で、第２図
は成形状態を示す断面図で、第３図は成形後のラック軸
の軸直角断面図である。
符号の説明1, 2, and 3 are cross-sectional views showing an embodiment of the present invention, FIG. 1 is a cross-sectional view showing a state before molding, and FIG. 2 is a cross-sectional view showing a molded state. FIG. 3 is an axis-perpendicular cross-sectional view of the rack shaft after molding. Explanation of symbols
Claims (1)
して、その鋼管内孔に、その背面に長手方向に延びる逃
げ溝を有する芯金を挿入し、その逃げ溝位置に前記溶接
跡を位置させた状態において、成形パンチによって鋼管
外周面の一部に平坦部又は山形粗形状を成形し、その後
歯形仕上げ加工を施すことを特徴とするラックピニオン
式舵取装置のラック軸の製造方法。An electrically welded pipe with a protruding weld mark left in the inner hole is used as a material steel pipe, and a core metal having a relief groove extending in the longitudinal direction on the back side is inserted into the inner hole of the steel pipe, and the welding mark is left at the position of the relief groove. A method for manufacturing a rack shaft for a rack and pinion type steering device, comprising forming a flat part or a rough chevron shape on a part of the outer circumferential surface of the steel pipe using a forming punch in the positioned state, and then subjecting the steel pipe to tooth profile finishing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7808584A JPS60221143A (en) | 1984-04-18 | 1984-04-18 | Manufacture of rack shaft of rack and pinion steering gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7808584A JPS60221143A (en) | 1984-04-18 | 1984-04-18 | Manufacture of rack shaft of rack and pinion steering gear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60221143A true JPS60221143A (en) | 1985-11-05 |
| JPS636301B2 JPS636301B2 (en) | 1988-02-09 |
Family
ID=13652005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7808584A Granted JPS60221143A (en) | 1984-04-18 | 1984-04-18 | Manufacture of rack shaft of rack and pinion steering gear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60221143A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0860225A2 (en) * | 1997-02-25 | 1998-08-26 | Koyo Seiko Co., Ltd. | Process for fabrication of rack shaft and fabrication machine therefor |
| CN1049614C (en) * | 1994-12-27 | 2000-02-23 | 昭和株式会社 | Apparatus for manufacturing automotive steering rack |
| CN1052670C (en) * | 1994-11-30 | 2000-05-24 | 昭和株式会社 | Method of manufacturing an automobile steering rack |
| US7069764B2 (en) | 2000-03-09 | 2006-07-04 | Nsk Ltd. | Method for manufacturing a hollow rack shaft |
| JP2013033883A (en) * | 2011-08-03 | 2013-02-14 | Disco Abrasive Syst Ltd | Frame clamp apparatus |
-
1984
- 1984-04-18 JP JP7808584A patent/JPS60221143A/en active Granted
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1052670C (en) * | 1994-11-30 | 2000-05-24 | 昭和株式会社 | Method of manufacturing an automobile steering rack |
| CN1049614C (en) * | 1994-12-27 | 2000-02-23 | 昭和株式会社 | Apparatus for manufacturing automotive steering rack |
| EP0860225A2 (en) * | 1997-02-25 | 1998-08-26 | Koyo Seiko Co., Ltd. | Process for fabrication of rack shaft and fabrication machine therefor |
| EP0860225A3 (en) * | 1997-02-25 | 1999-03-17 | Koyo Seiko Co., Ltd. | Process for fabrication of rack shaft and fabrication machine therefor |
| US6000267A (en) * | 1997-02-25 | 1999-12-14 | Koyo Seiko Co., Ltd. | Process for fabrication of rack shaft and fabrication machine therefor |
| US7069764B2 (en) | 2000-03-09 | 2006-07-04 | Nsk Ltd. | Method for manufacturing a hollow rack shaft |
| JP2013033883A (en) * | 2011-08-03 | 2013-02-14 | Disco Abrasive Syst Ltd | Frame clamp apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS636301B2 (en) | 1988-02-09 |
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