JPS6026811B2 - Hardening method for hollow rack shaft - Google Patents
Hardening method for hollow rack shaftInfo
- Publication number
- JPS6026811B2 JPS6026811B2 JP3876180A JP3876180A JPS6026811B2 JP S6026811 B2 JPS6026811 B2 JP S6026811B2 JP 3876180 A JP3876180 A JP 3876180A JP 3876180 A JP3876180 A JP 3876180A JP S6026811 B2 JPS6026811 B2 JP S6026811B2
- Authority
- JP
- Japan
- Prior art keywords
- rack
- rack shaft
- hole
- hollow
- hollow rack
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Description
【発明の詳細な説明】
本発明は、ラック歯を刻設したラック軸に軸方向貫通孔
を設けた中空ラック軸の齢入方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for aging a hollow rack shaft in which an axial through hole is provided in a rack shaft having rack teeth carved therein.
このような中空ラック軸は、例えば自動車用ラックピニ
オン型操向装置のラック軸として、装置を軽量化する上
で有利である。Such a hollow rack shaft is advantageous for use as a rack shaft in a rack and pinion type steering device for an automobile, for example, in order to reduce the weight of the device.
ところでこの種ラック軸のラック歯部分は、耐摩耗性と
共に耐衝撃性を必要とされるため高周波暁入等の表面競
入を施すのが一般である。しかしながら、このような中
空ラック軸にあってはラック歯部分は素材の肉厚が極端
に不均一になるため焼割れを生じ易く、特に最も肉薄と
なるラック歯の歯底部分に焼割れが発生し易い。又ラッ
ク礎の芯部中空であるため、加熱が芯部まで至り、ラッ
ク歯がズブ暁状態となり易く、ラック歯の耐衝撃性が損
なわれる等の問題点があった。本発明はこのような中空
ラック軸の焼入時に発生する暁割れを防止すると共に、
ラック歯の耐衝撃性を確保することを目的とするごこの
よ‐うな目的は、ラック歯を刻設したラック軸に軸方向
貫通孔を設けた中空ラック軸の競入方法において、ラッ
ク歯部分の加熱に際して前記貫通孔に冷媒を通流させて
該ラック歯部分を内側より冷却しつつ加熱することを特
徴とする中空ラック軸の暁入方法によって達成される。By the way, the rack tooth portion of this type of rack shaft is required to have not only wear resistance but also impact resistance, and therefore is generally subjected to surface attack such as high frequency wave penetration. However, with such a hollow rack shaft, the thickness of the material in the rack tooth portion is extremely uneven, so quench cracking is likely to occur, especially at the bottom of the rack tooth where the wall is the thinnest. Easy to do. Furthermore, since the core of the rack foundation is hollow, heating reaches the core, which tends to cause the rack teeth to become swollen, resulting in problems such as loss of impact resistance of the rack teeth. The present invention prevents dawn cracking that occurs during hardening of such hollow rack shafts, and
This purpose is to ensure the impact resistance of the rack teeth.In the method of inserting a hollow rack shaft in which an axial through hole is provided in a rack shaft with rack teeth carved thereon, the rack tooth portion is This is achieved by a method for inserting a hollow rack shaft into a hollow rack shaft, which is characterized in that during heating, a refrigerant is passed through the through hole to cool and heat the rack tooth portion from the inside.
本発明においては、ラック歯部分の加熱に際して、その
滋方向貫通孔に冷媒を通流させてラック歯部分を内側よ
り冷却しつつ加熱するので、貫通孔の周囲所定範囲は加
熱中も変態点以下に保たれ、ラック歯の歯底部分の最も
肉薄な部分にも暁割れが発生せず、又貫通孔から所定距
離硬化層が後退した暁入パターンとなって、ラック歯が
ズブ暁状態となるのが防止され、ラック歯の耐衝撃性が
確保される。In the present invention, when heating the rack teeth, a refrigerant is passed through the through holes in the feed direction to cool the rack teeth from the inside while heating, so that the predetermined area around the through holes remains below the transformation point even during heating. The rack teeth are maintained at the same temperature, and no dawn cracks occur even in the thinnest part of the tooth bottom of the rack teeth.Also, the hardened layer retreats a predetermined distance from the through hole, resulting in a dawn pattern, and the rack teeth become completely dark. The impact resistance of the rack teeth is ensured.
次に本発明実施例を従来例と比較しつつ説明する。Next, an embodiment of the present invention will be explained while comparing it with a conventional example.
第１図に示す如く、中空ラック軸１を治具２に装着し、
冷媒環流装置の導管３，４をラック軸の貫通孔５の各端
に着脱自在に装着した。As shown in FIG. 1, the hollow rack shaft 1 is mounted on the jig 2,
The conduits 3 and 4 of the refrigerant circulation device were detachably attached to each end of the through hole 5 of the rack shaft.
６は冷媒タンク、７まポンプである。6 is a refrigerant tank, and 7 is a pump.
８は高周波議導コイルであり競入のための冷却水の噴出
装置を兼ねている。8 is a high frequency guiding coil which also serves as a cooling water jetting device for competition.
この状態で次の条件で焼入を施した。■ 供試ラック軸
材質・・・Ｓ４＄材（ＪＩＳ）
外径・・・２．１肋
貫通孔の内径・・・８側
ラック歯のモジューノレ”２
歯底と貫通孔との最近接距離・・・０．５柳■ 競入条
件暁入方法…高周波競入
周波数…１０ＯＫＨＺ
プレート電圧・・・１兆Ｖ
プレ・・・ト電流・・・１０Ａ
印加時間・・・５秒
冷却水・・・エチレングリコール系嬢割防止剤１０％水
溶液ラック軸の貫通孔に通流させる袷煤
・・・冷却水と同じ
袷煤通流量・・・２０そ／ｍｉｎ
その結果、第２図に示す如き暁入パターンのものが得ら
れた。In this state, quenching was performed under the following conditions. ■ Test rack shaft material: S4$ material (JIS) Outer diameter: 2.1 Inner diameter of the 1st rib through hole: Modulus of the 8 side rack teeth 2. Closest distance between the tooth bottom and the through hole. ...0.5 Yanagi■ Competition conditions Akatsuki method...High frequency Competition frequency...10OKHZ Plate voltage...1 trillion V Plate current...10A Application time...5 seconds Cooling water... A 10% aqueous solution of ethylene glycol-based crack prevention agent Aqueous solution of soot passed through the through hole of the rack shaft...Same soot flow rate as cooling water...20 min. A pattern was obtained.
第２図はラック歯の歯先部を含む切断面を示しているが
、ラック軸の貫通孔を通流させた冷煤によって、貫通孔
から約２柳の範囲で硬化層が後退している。これに対し
、ラック軸の貫通孔に袷煤を通流させないで他の条件を
同一にして行った従来例のものは、第３図に示す如き焼
入パターンとなった。Figure 2 shows a cut surface including the tips of the rack teeth, and the hardened layer has receded within a range of approximately 2 willows from the through-hole due to the cold soot flowing through the through-hole of the rack shaft. . On the other hand, in the conventional example in which soot was not passed through the through-hole of the rack shaft and other conditions were the same, the hardening pattern was as shown in FIG.
これはラック歯が完全にズブ焼状態となっており、又ラ
ック歯の歯底部分の肉薄部に焼割れが発生したり、時に
は部分的に溶融したりする。第４図は焼入後の硬度分布
を、ラック歯の歯先面からラック軸の芯に向かう方向に
沿って示したものである。グラフでも明らかなように、
冷蝶を通流させない従釆のものは、歯先面から貫通孔に
至るまで一様の硬度でズブ焼状態であるが、本発明実施
例では、歯先面から略２側程度の深さで硬度が低下し、
芯部は硬化していない。第５図は前述の本発明実施例と
従来例とを耐衝撃テストで比較した結果を示している。This is because the rack teeth are completely burnt out, and the thin bottom portions of the rack teeth are cracked or sometimes partially melted. FIG. 4 shows the hardness distribution after quenching along the direction from the tip surface of the rack tooth toward the center of the rack shaft. As is clear from the graph,
A secondary type that does not allow cold flow to flow through the hole has uniform hardness from the tooth tip to the through hole, but in the embodiment of the present invention, the hardness is approximately two sides from the tooth tip. The hardness decreases with
The core is not hardened. FIG. 5 shows the results of a comparison between the above-described embodiment of the present invention and the conventional example in an impact test.
ラック髄を相手歯車と噛み合わせた状態で相手歯車を固
定し、ラック軸の端面に５０ｋｇの重錘を順次５加増し
て高さを増しながら自由港下させたものであるが、本発
明実施例のものは落下高さ２５弧（つまり５回め）で初
めて破断したのに対し、従来例のものは１５弧（つまり
３回め）ですでに破断した。尚、前述の実施例において
は、ラック軸の貫通孔に通流させる冷煤として暁割防止
剤の水溶液を使用したが、袷煤の種類を変えることによ
って、例えばオイルを使用あるいはエアーを使用するこ
とによって、あるし、は冷媒の通流量を変えることによ
って前記焼入パターンは大中にも又微妙にも変化させる
ことができる。冷蝶を変えることは大中な変化を望む場
合に有効であり、又流量の調整は微妙な変化を望む場合
に有効である。本発明は前述の如くであるから、中空ラ
ック軸の暁入における肉薄部の焼割れを防止でき、同時
にラック歯がズブ暁状態となることを防止してラック歯
の耐衝撃性を確保することができ、又冷煤の流量を変え
ることによって容易に競入パターンを微妙に変えること
ができる等の効果を有する。The mating gear was fixed with the rack pulp meshed with the mating gear, and a 50 kg weight was sequentially increased by 5 on the end face of the rack shaft to increase the height while lowering the rack into a free port.This is an embodiment of the present invention. The conventional example broke for the first time at a fall height of 25 arcs (that is, the 5th time), while the conventional one broke already at the 15th arc (that is, the 3rd time). In the above embodiment, an aqueous solution of anti-dawning agent was used as the cold soot to flow through the through hole of the rack shaft, but by changing the type of soot, for example, oil or air can be used. By changing the flow rate of the coolant, the quenching pattern can be changed significantly or slightly. Changing the cold temperature is effective when a large or medium change is desired, and adjusting the flow rate is effective when a subtle change is desired. Since the present invention is as described above, it is possible to prevent quench cracking of the thin wall part when the hollow rack shaft is inserted at dawn, and at the same time, it is possible to prevent the rack teeth from becoming half-shaken, thereby ensuring the impact resistance of the rack teeth. It also has the effect that the competition pattern can be easily changed slightly by changing the flow rate of cold soot.
第１図は本発明一実施例を示す系統図、第２図は本発明
一実施例の嘘入パターンを示す切断面の図面代用写真、
第３図は従来例の焼入パターンを示す切断面の図面代用
写真、第４図は硬度分布を示すグラフ、第５図は衝撃テ
スト結果を示すグラフである。
符号の説明、１…・・・中空ラック軸、２……治具、３
，４…・・・導管、５・…・・貫通孔、６・・・・・・
冷媒タンク、７・・・・・・ポンプ、８・・・・・・誘
導コイル。
多１図第２図
第３図
繁４図
多５図Fig. 1 is a system diagram showing an embodiment of the present invention, Fig. 2 is a photograph substituted for a drawing of a cut section showing a lie-in pattern of an embodiment of the present invention,
FIG. 3 is a photograph substituted for a drawing of a cut surface showing a conventional hardening pattern, FIG. 4 is a graph showing hardness distribution, and FIG. 5 is a graph showing impact test results. Explanation of symbols, 1...Hollow rack shaft, 2...Jig, 3
, 4... Conduit, 5... Through hole, 6...
Refrigerant tank, 7...pump, 8...induction coil. Figure 1 Figure 2 Figure 3 Traditional Figure 4 Figure 5
Claims (1)
た中空ラツク軸の焼入方法において、ラツク歯部分の加
熱に際して前記貫通孔に冷媒を通流させて該ラツク歯部
分を内側より冷却しつつ加熱することを特徴とする中空
ラツク軸の焼入方法。1. In a method for hardening a hollow rack shaft in which a rack shaft having rack teeth carved therein is provided with an axial through hole, the rack tooth portion is cooled from the inside by flowing a refrigerant through the through hole when heating the rack tooth portion. A method for quenching hollow rack shafts, which is characterized by heating while heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3876180A JPS6026811B2 (en) | 1980-03-25 | 1980-03-25 | Hardening method for hollow rack shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3876180A JPS6026811B2 (en) | 1980-03-25 | 1980-03-25 | Hardening method for hollow rack shaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56136926A JPS56136926A (en) | 1981-10-26 |
| JPS6026811B2 true JPS6026811B2 (en) | 1985-06-26 |
Family
ID=12534259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3876180A Expired JPS6026811B2 (en) | 1980-03-25 | 1980-03-25 | Hardening method for hollow rack shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6026811B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03219023A (en) * | 1990-01-24 | 1991-09-26 | Hitachi Ltd | Method and apparatus for strengthening pressure proof of metal-made hollow structure, and pressure proof hollow structure made with this method and method for using the same under pressure proof condition |
| DE102007015314B4 (en) * | 2007-03-28 | 2015-04-16 | Efd Induction Gmbh | Inductor for induction hardening of metallic workpieces |
| CN109957638B (en) | 2019-03-06 | 2019-11-15 | 上海交通大学 | A kind of method that the horizontal water quenching of shaft forgings with holes avoids inner hole from cracking |
-
1980
- 1980-03-25 JP JP3876180A patent/JPS6026811B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56136926A (en) | 1981-10-26 |
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