JPS62180018A - High frequency quenching method for steering rack - Google Patents
High frequency quenching method for steering rackInfo
- Publication number
- JPS62180018A JPS62180018A JP61020899A JP2089986A JPS62180018A JP S62180018 A JPS62180018 A JP S62180018A JP 61020899 A JP61020899 A JP 61020899A JP 2089986 A JP2089986 A JP 2089986A JP S62180018 A JPS62180018 A JP S62180018A
- Authority
- JP
- Japan
- Prior art keywords
- tooth
- steering rack
- rack
- induction coil
- rear part
- 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
- 238000000034 method Methods 0.000 title claims description 14
- 238000010791 quenching Methods 0.000 title abstract 8
- 230000000171 quenching effect Effects 0.000 title abstract 6
- 230000006698 induction Effects 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000003507 refrigerant Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 abstract description 10
- 238000005452 bending Methods 0.000 abstract description 8
- 239000002826 coolant Substances 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は自動車等車両のラックピニオン式操向装置に用
いるステアリングラックの歯部と背面部に高周波焼入に
より焼入硬化層を形成するステアリングラックの焼入方
法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a steering system in which a hardened layer is formed by induction hardening on the teeth and back surface of a steering rack used in a rack and pinion type steering device for vehicles such as automobiles. Relating to a rack hardening method.
ラックピニオン式操向装置のステアリングラックは、第
５図に示す如くピニオンと噛み合う複数のラック歯が形
成されており、ラック歯の耐摩耗性を向上するために歯
部に高周波焼入れによる山部焼入硬化層（２）が形成さ
れている。そして、昨今ステアリングラックの軸強度（
特に耐曲げ強度）を増すために、ステアリングラックの
背面部にも背面部焼入硬化Ｎ（３）を形成することが試
みられている。この歯部及び背画部焼入硬化層の高周波
焼入方法は、特開昭５９−９１２４号公報に開示され第
６図に示す如く、歯部は平坦な誘導コイル（１７）、背
面部は略半円箭形の誘導コイル（１８）により高周波焼
入されて得られる。As shown in Fig. 5, the steering rack of a rack and pinion type steering device is formed with a plurality of rack teeth that mesh with the pinion.In order to improve the wear resistance of the rack teeth, the crests of the teeth are hardened by induction hardening. A hardened layer (2) is formed. And recently, the shaft strength of steering racks (
In order to increase the bending strength in particular, attempts have been made to form quench-hardened N(3) on the back surface of the steering rack as well. This induction hardening method for the hardened tooth and back layers is disclosed in Japanese Unexamined Patent Publication No. 59-9124, and as shown in FIG. It is obtained by induction hardening using a substantially semicircular induction coil (18).
しかし、前述の如く高周波焼入することは下記の如き欠
点がある。先ず、半円筒形の誘導コイル（１８）を流れ
る高周波電流により、ステアリングラックの略半分を均
等に加熱するために、熱処理歪によるステアリングラッ
クの曲がりが多方向に渡って生じることになる。このこ
とは、曲がり方向によって山部の一部分のみが著しく変
形（収縮）し、ステアリングラックとして好ましいもの
ではない。又、矯正作業においてもステアリングラック
を押圧する際に、歯面に対して横方向や斜め方向から押
圧することになり、歯部に収縮部分と膨張部分とが生し
て、歯部に変形を生じ易く、ピニオンとの噛み合いにお
いて好ましいものではな（、矯正作業が困難なものであ
った。However, induction hardening as described above has the following drawbacks. First, the high-frequency current flowing through the semi-cylindrical induction coil (18) uniformly heats approximately half of the steering rack, causing bending of the steering rack in multiple directions due to heat treatment distortion. This is not preferable for a steering rack because only a portion of the crest is significantly deformed (shrinked) depending on the bending direction. In addition, when pressing the steering rack during orthodontic work, the pressure is applied from the side or diagonal direction to the tooth surface, resulting in a contracted part and an expanded part in the tooth part, causing deformation of the tooth part. This easily occurs and is not desirable in terms of engagement with the pinion (and correction work is difficult).
本発明はこれらの点に鑑みなされたもので、ステアリン
グラックの背面部を高周波焼入する際に、歯部に局部的
に変形を生じることがなく、しかも後の矯正作業におい
ても歯部に変形を生じることがなく、矯正作業を容易な
ものとするステアリングラックの高周波焼入方法を提供
することを目的とする。The present invention was developed in view of these points, and when the back surface of the steering rack is induction hardened, there is no local deformation of the tooth portion, and furthermore, the tooth portion does not deform even during subsequent orthodontic work. It is an object of the present invention to provide a method for induction hardening a steering rack, which facilitates straightening work without causing damage.
本発明は、略円形断面のステアリングラックに形成され
た歯部とその背面部とに高周波焼入れによる焼入硬化層
を形成するステアリングラックの焼入方法において、平
坦面を有する誘導コイルを、その平坦面をステアリング
ラック歯先面に平行に対面させて配し、該誘導コイルを
流れる高周波電流により歯部を所定温度加熱し、この歯
部に冷媒液を噴射して該歯部に焼入硬化層を形成する歯
部焼入工程と、略平坦面を有する誘導コイルを、その略
平坦面をステアリングラック歯先面に平行にステアリン
グラック背面部に対面させて配し、ステアリングラック
の背面部を誘導コイルを流れる高周波電流により所定温
度加熱し、この背面部に冷媒液を噴射して該背面部に焼
入硬化層を形成する背面部焼入工程とから成るものであ
る。The present invention provides a method for hardening a steering rack in which a hardened layer is formed by induction hardening on teeth formed on a steering rack having a substantially circular cross section and a back surface thereof. The surfaces of the steering rack teeth are arranged so as to face parallel to each other, and the teeth are heated to a predetermined temperature by a high-frequency current flowing through the induction coil, and a refrigerant liquid is injected onto the teeth to form a hardened layer on the teeth. An induction coil having a substantially flat surface is arranged with its substantially flat surface facing the back surface of the steering rack in parallel with the tip surface of the steering rack teeth, thereby guiding the back surface of the steering rack. This process consists of a back surface hardening process in which the coil is heated to a predetermined temperature by a high frequency current flowing through the coil, and a refrigerant liquid is injected onto the back surface to form a hardened layer on the back surface.
本発明は前述の如くであるから、歯部は平坦な誘導コイ
ルにより均一に加熱されて、熱処理歪は歯部を軸線方向
凸状に曲げる如く作用し、一方背面部は略平坦な誘導コ
イルにより背面部中央が最も熱膨張して、熱処理歪は歯
部を軸線方向凹状に曲げる如く作用するので、全体とし
ての熱処理歪は歯部と背面部との熱処理歪との相殺され
た差だけで、歪量は少なくなり歯部の局部的な変形がな
い。そして、矯正作業においては、前述の如く山部が僅
かに凸状か凹状となり、歯先面に垂直な力を加えれば良
いので、歯部の変形がなく、又曲がり方向が略一定とな
るので矯正作業が容易となる。Since the present invention is as described above, the teeth are uniformly heated by the flat induction coil, and the heat treatment strain acts to bend the teeth convexly in the axial direction, while the back surface is heated by the substantially flat induction coil. The center of the back surface expands most thermally, and the heat treatment strain acts to bend the tooth section into a concave shape in the axial direction, so the overall heat treatment strain is only the offset difference between the heat treatment strain on the tooth section and the back surface section. The amount of strain is reduced and there is no local deformation of the teeth. In the orthodontic work, as mentioned above, the ridges become slightly convex or concave, and it is sufficient to apply a force perpendicular to the tooth tip surface, so there is no deformation of the tooth and the bending direction remains approximately constant. Correction work becomes easier.
本発明を直径・・・２２ （ｍｍ）、長さ６００ （ｍ
ｍ）、歯谷数・・・２８、ラック歯のモジュール・・・
２、材質・・・３４５Ｃ（ＪＩＳ）のステアリングラッ
クに適用した。第１図は歯部の焼入工程を示すもので、
使用した高周波焼入装置（１６）は、高周波電源（４）
と、この高周波電源（４）に接続した導体（５） （６
）と、この導体（５） （６）に接続した接触電極（７
） （８）と、電極（７）（８）の間に設けた平坦な誘
導コイル（９）と、電極（７）（８）との間でステアリ
ングラック（１）を挟持する保持部材（１０）と、誘導
コイル（９）の小孔（１１）から冷媒液を噴出する冷媒
供給装置（１２）とから成る。先ず、ステアリングラッ
クの歯先面と誘導コイル（９）の平坦な面とが第２図に
示す如く平行になる様に、高周波焼入装置にステアリン
グラック（１）を接触電極（７）（８）と保持部材（１
０）で挟持固定して、ステアリングラック歯部を下記条
件で所定温度加熱する。The present invention has a diameter of 22 (mm) and a length of 600 (m).
m), Number of tooth valleys...28, Rack tooth module...
2. Material: Applied to 345C (JIS) steering rack. Figure 1 shows the hardening process for the teeth.
The induction hardening device (16) used is a high frequency power source (4)
And the conductor (5) (6) connected to this high frequency power source (4)
) and the contact electrode (7) connected to this conductor (5) (6)
) (8), a flat induction coil (9) provided between the electrodes (7) and (8), and a holding member (10) that holds the steering rack (1) between the electrodes (7) and (8). ), and a refrigerant supply device (12) that spouts refrigerant liquid from the small holes (11) of the induction coil (9). First, the steering rack (1) is placed in an induction hardening machine so that the contact electrodes (7) (8) are placed in such a way that the tooth tips of the steering rack and the flat surface of the induction coil (9) are parallel to each other as shown in Figure 2. ) and holding member (1
0) and heat the steering rack teeth to a predetermined temperature under the following conditions.
周波数・・・１００ＫＨｚ プレート電圧・・・１３
．５ＫＶプレート電流・・・６．６Ａ 印加時間・・・
４．０秒上記条件により加熱した歯部を、冷媒液として
エチレングリコール系焼割防止剤１０％水溶液を用い、
この冷媒を誘導コイル（９）の小孔（１１）から加熱し
た歯面に噴射して、歯部を４．５秒間冷却して歯部焼入
硬化層を形成する。この時、歯部は均一に焼入れされる
ので、ラック歯は局部変形することがなく、熱処理歪は
歯部が軸線方向凸状に曲がる様に生じ、曲がり量は平均
２．３ｍｍである。そして、歯部焼入硬化層を形成した
ステアリングラツク（１）を第３図、第４図に示す如く
、平坦面を有する誘導コイル（１９）の平坦面と、ステ
アリングラック歯先面とが略平行となる様に、３ｉ １
コイル（１９）をステアリングラック背面部に対面させ
て配し、接触電極（１３） （１４）と保持部材（１５
）とで挟持固定して、下記条件でステアリングラック（
１）の背面を所定温度加熱する。Frequency...100KHz Plate voltage...13
．． 5KV plate current...6.6A Application time...
The tooth portion heated under the above conditions for 4.0 seconds was heated using a 10% aqueous solution of an ethylene glycol anti-shatter agent as the refrigerant liquid.
This coolant is injected onto the heated tooth surface from the small hole (11) of the induction coil (9) to cool the tooth portion for 4.5 seconds to form a hardened layer on the tooth portion. At this time, since the tooth portion is uniformly hardened, the rack tooth is not locally deformed, and heat treatment distortion occurs such that the tooth portion is bent convexly in the axial direction, and the amount of bending is 2.3 mm on average. As shown in FIGS. 3 and 4, the steering rack (1) on which the hardened tooth layer is formed is shown in FIG. 3i 1 so that it is parallel
The coil (19) is arranged facing the back of the steering rack, and the contact electrodes (13) (14) and the holding member (15)
) and fix it with the steering rack (
1) Heat the back side to a predetermined temperature.
周波数・・・１００ Ｋ Ｈｚ プレート電圧・・・
１０．０ＫＶプレート電流・・・８，４Ａ 印加時間・
・・３．５秒上記条件で加熱したステアリングラック背
面部に、誘導コイル（１９）の小孔から冷媒を４．５秒
間噴射して、背画部焼入硬化層を形成する。この時、背
面部は第４図に示す如く背画部中央の焼入硬化層が最も
深く熱膨張が大きいので、ラック歯は局部変化すること
がなく、熱処理歪は歯部が軸線方向へ凹状に曲がる様に
生じるが、先に焼入れした歯部焼入硬化層により曲がり
が規制され、熱処理歪は第７図に示す線りの如く発生し
、平均１．６ｍｍ程度のフレ量となり、ラック歯の局部
変形は見られない。そして、矯正作業に際して矢印Ｅの
如くラック歯先面に垂直にステアリングラックを押圧す
るので、ラック歯が局部変形することがなく、しかも曲
がりの方向が略一定となるので、矯正作業を著しく容易
なものとすることが出来る。Frequency...100 KHz Plate voltage...
10.0KV plate current...8.4A application time・
...3.5 seconds Coolant is injected for 4.5 seconds from the small holes of the induction coil (19) onto the back surface of the steering rack heated under the above conditions to form a quenched and hardened layer on the back surface. At this time, as shown in Figure 4, in the back part, the hardened layer in the center of the back part is the deepest and has the largest thermal expansion, so the rack teeth do not change locally, and the heat treatment strain causes the teeth to become concave in the axial direction. However, the bending is regulated by the hardened layer on the teeth that has been hardened first, and the heat treatment distortion occurs as shown in the line shown in Figure 7, with an average deflection of about 1.6 mm, and the rack teeth No local deformation is observed. During straightening work, the steering rack is pressed perpendicularly to the top surface of the rack teeth as shown by arrow E, so the rack teeth are not locally deformed and the direction of bending remains approximately constant, making the straightening work much easier. It can be made into something.
本実施では、歯部、背面部の順で高周波焼入したが、そ
の逆でも良く、いずれも歪量は小さくラック歯の局部変
形は生じない。尚、焼入れ条件によっては、歯部が凹状
に歪を生しることがあるが、本発明では歪量が小さく、
矯正作業において多大な力を要しないので、何ら不都合
を生じることがない。In this embodiment, the tooth portion and the back surface portion were induction hardened in this order, but the reverse order may also be used, and the amount of distortion is small in both cases and no local deformation of the rack teeth occurs. Note that depending on the hardening conditions, the teeth may be distorted into a concave shape, but in the present invention, the amount of distortion is small;
Since a large amount of force is not required in the correction work, no inconvenience will occur.
本発明は前述の如くであるから、ステアリングラックの
焼入方法において、歯部と背面部とに高周波焼入硬化層
を形成しても、ラック歯部に局部的な変形を生じること
がなく、しかも矯正作業においてもラック歯部に変形を
生じることがなく、矯正作業を容易なものとすることが
出来る等の効果を奏する。Since the present invention is as described above, in the steering rack hardening method, even if an induction hardened layer is formed on the tooth portion and the back surface portion, local deformation does not occur in the rack tooth portion. In addition, the rack teeth are not deformed during orthodontic work, and the orthodontic work can be easily carried out.
第１図は本発明実施例の歯部焼入工程を示す一部切欠正
面図、第２図は第１図Ａ−Ａ線に沿う拡大断面部、第３
図は本発明実施例の背面部焼入工程を示す一部切欠正面
図、第４図は第３図Ｂ−Ｂ線に沿う拡大断面図、第５図
は従来焼入方法によるステアリングラックを示し、第５
図（ａ）は縦断面図、第５図（ｂ）は第５図（ａ）Ｃ−
Ｃ線に沿う断面図、第６図は高周波焼入の従来例を示す
縦断面図、第７図はステアリングラックの熱処理歪の状
態を示す説明図である。
符号の説明
１・・・ステアリングラック ２・・・歯部焼入硬化層
３・・・背画部焼入硬化層 １６・・・高周波焼入装置
９．１９・・・誘導コイルFIG. 1 is a partially cutaway front view showing the tooth hardening process of an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view taken along line A-A in FIG.
The figure is a partially cutaway front view showing the back hardening process of the embodiment of the present invention, FIG. 4 is an enlarged sectional view taken along the line B-B in FIG. 3, and FIG. , 5th
Figure (a) is a longitudinal sectional view, Figure 5 (b) is Figure 5 (a)C-
6 is a longitudinal sectional view showing a conventional example of induction hardening, and FIG. 7 is an explanatory view showing the state of heat treatment distortion of the steering rack. Explanation of symbols 1...Steering rack 2...Hardened tooth layer 3...Hardened back layer 16...Induction hardening device 9.19...Induction coil
Claims (1)
の背面部とに高周波焼入れによる焼入硬化層を形成する
ステアリングラックの焼入方法において、平坦面を有す
る誘導コイルを、その平坦面をステアリングラック歯先
面に平行に対面させて配し、該誘導コイルを流れる高周
波電流により歯部を所定温度加熱し、この歯部に冷媒液
を噴射して該歯部に焼入硬化層を形成する歯部焼入工程
と、略平坦面を有する誘導コイルを、その略平坦面をス
テアリングラック歯先面に平行にステアリングラック背
面部に対面させて配し、ステアリングラックの背面部を
誘導コイルを流れる高周波電流により所定温度加熱し、
この背面部に冷媒液を噴射して該背面部に焼入硬化層を
形成する背面部焼入工程とから成ることを特徴とするス
テアリングラックの高周波焼入方法。In a steering rack hardening method in which a hardened layer is formed by induction hardening on the teeth formed on a steering rack having a substantially circular cross section and the back surface thereof, an induction coil having a flat surface is attached to the steering rack. A tooth that is arranged facing parallel to the tooth tip surface, the tooth portion is heated to a predetermined temperature by a high frequency current flowing through the induction coil, and a refrigerant liquid is injected onto the tooth portion to form a hardened layer on the tooth portion. A partial hardening process is performed, and an induction coil having a substantially flat surface is arranged with the substantially flat surface facing the back surface of the steering rack in parallel with the tip surface of the steering rack. Heated to a predetermined temperature using electric current,
A method for induction hardening a steering rack, comprising a back surface hardening step of injecting a refrigerant liquid onto the back surface to form a hardened layer on the back surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61020899A JPS62180018A (en) | 1986-01-31 | 1986-01-31 | High frequency quenching method for steering rack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61020899A JPS62180018A (en) | 1986-01-31 | 1986-01-31 | High frequency quenching method for steering rack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62180018A true JPS62180018A (en) | 1987-08-07 |
| JPH0235012B2 JPH0235012B2 (en) | 1990-08-08 |
Family
ID=12040075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61020899A Granted JPS62180018A (en) | 1986-01-31 | 1986-01-31 | High frequency quenching method for steering rack |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62180018A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06264991A (en) * | 1993-03-11 | 1994-09-20 | Johnan Seisakusho Co Ltd | Manufacture of sector gear |
| JP2007076587A (en) * | 2005-09-16 | 2007-03-29 | Jtekt Corp | Steering device |
| US7662245B2 (en) | 2003-05-27 | 2010-02-16 | Koyo Seiko Co., Ltd. | Steering rack comprising steel bar with rack teeth |
| JP2010190291A (en) * | 2009-02-17 | 2010-09-02 | Jtekt Corp | Method of manufacturing circular member |
| WO2019235239A1 (en) * | 2018-06-04 | 2019-12-12 | Neturen Co., Ltd. | Rack bar in preliminary form before quenching and rack bar manufacturing method |
| WO2020066805A1 (en) * | 2018-09-25 | 2020-04-02 | Neturen Co., Ltd. | Quenching device and method for quenching rack bar |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS599124A (en) * | 1982-07-09 | 1984-01-18 | Denki Kogyo Kk | Simultaneous hardening method of rack bar for steering |
| JPS5940655U (en) * | 1982-09-10 | 1984-03-15 | 日産自動車株式会社 | automotive steering rack |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2534904B2 (en) * | 1975-08-05 | 1979-09-13 | Wabco Fahrzeugbremsen Gmbh, 3000 Hannover | Safety and monitoring circuit for anti-lock vehicle brakes |
-
1986
- 1986-01-31 JP JP61020899A patent/JPS62180018A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS599124A (en) * | 1982-07-09 | 1984-01-18 | Denki Kogyo Kk | Simultaneous hardening method of rack bar for steering |
| JPS5940655U (en) * | 1982-09-10 | 1984-03-15 | 日産自動車株式会社 | automotive steering rack |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06264991A (en) * | 1993-03-11 | 1994-09-20 | Johnan Seisakusho Co Ltd | Manufacture of sector gear |
| US7662245B2 (en) | 2003-05-27 | 2010-02-16 | Koyo Seiko Co., Ltd. | Steering rack comprising steel bar with rack teeth |
| JP2007076587A (en) * | 2005-09-16 | 2007-03-29 | Jtekt Corp | Steering device |
| JP2010190291A (en) * | 2009-02-17 | 2010-09-02 | Jtekt Corp | Method of manufacturing circular member |
| WO2019235239A1 (en) * | 2018-06-04 | 2019-12-12 | Neturen Co., Ltd. | Rack bar in preliminary form before quenching and rack bar manufacturing method |
| WO2020066805A1 (en) * | 2018-09-25 | 2020-04-02 | Neturen Co., Ltd. | Quenching device and method for quenching rack bar |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0235012B2 (en) | 1990-08-08 |
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