JP2717578B2 - Steel material for quenching hardened gears - Google Patents
Steel material for quenching hardened gearsInfo
- Publication number
- JP2717578B2 JP2717578B2 JP1195280A JP19528089A JP2717578B2 JP 2717578 B2 JP2717578 B2 JP 2717578B2 JP 1195280 A JP1195280 A JP 1195280A JP 19528089 A JP19528089 A JP 19528089A JP 2717578 B2 JP2717578 B2 JP 2717578B2
- Authority
- JP
- Japan
- Prior art keywords
- steel material
- weight
- quench
- steel
- hardened
- 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 - Lifetime
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- Gears, Cams (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は表面硬化熱処理を行う歯車用鋼材に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a steel material for gears subjected to a surface hardening heat treatment.
従来、歯車の表面硬化熱処理方法としては、浸炭焼入
焼戻法、高周波焼入焼戻法、窒化法が用いられ、歯車用
鋼材としては安定した品質と、高い強度を得るために、
JISに定められたSNCM420H,SCM445Hなどが多く用いられ
ている。Conventionally, carburizing and quenching and tempering, induction quenching and tempering, and nitriding have been used as surface hardening and heat treatment methods for gears.To obtain stable quality and high strength as gear steel,
SNCM420H and SCM445H specified in JIS are often used.
上記従来の表面硬化熱処理方法によると、浸炭焼入焼
戻法では熱処理時間が長く生産性に劣る。高周波焼入焼
戻法では歯車精度および強度がおとる。窒化法では硬化
層が薄く疲労強度が劣り、処理時間も長い。そのため加
圧噴射式の表面硬化熱処理方法が提案されている。この
方法によれば熱処理時間も短く、歯車精度も良く、硬化
層も厚く、強度的にも優れた歯車を得られる。歯の硬化
パターンは、ピッチ円付近の硬化層は厚く、歯元の硬化
層は薄いのが理想的であり、歯元の硬化深さはモジュー
ルの0.05〜0.40倍が最も歯元の疲労強度が高い。しかし
ながら、従来の化学成分の鋼材は、表面硬化熱処理方法
で歯車品質を得るために適正ではない。請求項１記載の
範囲は、前記歯車品質をうるのに適した鋼材の基本範囲
を示している。本発明は、加圧噴射式表面硬化熱処理法
により、容易に前記歯元の硬化深さが得られる材料成分
の鋼材を提供することを目的としている。According to the conventional surface hardening heat treatment method, the carburizing quenching and tempering method has a long heat treatment time and is inferior in productivity. Gear precision and strength are low in the induction hardening and tempering method. In the nitriding method, the hardened layer is thin, the fatigue strength is inferior, and the processing time is long. Therefore, a pressure injection type surface hardening heat treatment method has been proposed. According to this method, a gear having a short heat treatment time, good gear accuracy, a thick hardened layer, and excellent strength can be obtained. Ideally, the hardening pattern of the teeth is that the hardened layer near the pitch circle is thick and the hardened layer at the root is thin. high. However, conventional steel materials of chemical composition are not suitable for obtaining gear quality by the surface hardening heat treatment method. The scope of claim 1 indicates a basic range of steel materials suitable for obtaining the gear quality. An object of the present invention is to provide a steel material of a material component that can easily obtain the hardening depth of the tooth root by a pressure injection type surface hardening heat treatment method.
上記目的を達成するには鋼材の焼入性を改善すること
が必要である。本研究者はこの点に着目し鋭意研究の結
果、以下に述べる材料成分の鋼材を見いだし、本発明に
到達したものである。To achieve the above object, it is necessary to improve the hardenability of steel. The present researcher paid attention to this point, and as a result of earnest research, found a steel material having the following material components and arrived at the present invention.
すなわち、本発明に係る焼入硬化歯車用鋼材の第１発
明は、表面硬化熱処理を行う歯車用鋼材において、材料
成分が重量％で炭素;0.40〜1.30、けい素;0.05〜1.0、
マンガン;0.30〜1.5、ニッケル;0.001〜2.0、クロム;0.
01〜1.5、モリブデン;0.001〜0.50、りん;0.005〜0.03
0、硫黄;0.005〜0.030、銅;0.001〜0.30、アルミニウ
ム;0.01〜0.10を含有し、残部は鉄及び不可避的不純物
からなり、不純物として、酸素は20ppm以下であること
を特徴とする。That is, the first invention of the steel material for a quench-hardened gear according to the present invention is a steel material for a gear subjected to a surface hardening heat treatment, wherein the material component is carbon: 0.40 to 1.30 in weight%; silicon;
Manganese; 0.30-1.5, nickel; 0.001-2.0, chromium; 0.
01-1.5, molybdenum; 0.001-0.50, phosphorus; 0.005-0.03
0, sulfur; 0.005 to 0.030, copper; 0.001 to 0.30, aluminum; 0.01 to 0.10, the balance being iron and unavoidable impurities, and oxygen is 20 ppm or less as impurities.
前記炭素量は必要な表面硬さHRC50以上を確保するた
め0.4重量％以上とし、多すぎると粗大セメントタイト
の存在の可能性が増し、疲労強度を低下をまねくため1.
3重量％以下としている。この量は好ましくは0.6重量％
以上、1.1重量％以下である。けい素、マンガン、ニッ
ケル、クロム、モリブデン、は多いほど焼入性は良くな
るが、あまり多すぎると被削性が低下するので上限と下
限をもうけ、それぞれ、0.05〜1.0重量％,0.30〜1.5重
量％,0.001〜2.0重量％,0.01〜1.5重量％,0.001〜0.5重
量％としている。りん、硫黄、銅は多すぎると疲労強度
が低下するため範囲を定め、それぞれ、0.005〜0.030重
量％,0.005〜0.030重量％,0.001〜0.30重量％としてい
る。アルミニウムは結晶粒の微細化のためと靭性の低下
を防止するため、0.010〜0.100重量％とし、酸素量は疲
労強度を確保するため20ppm以下としている。上記のご
とき材料成分の鋼材は焼入性が向上し、これを760℃〜9
00℃に加熱し加圧噴射式焼入装置に取り付け、熱処理を
行えば希望する歯車を製作する事が出来る。The carbon content is set to 0.4% by weight or more to secure a required surface hardness of HRC 50 or more.If the carbon content is too large, the possibility of the presence of coarse cementite increases and the fatigue strength decreases.
3% by weight or less. This amount is preferably 0.6% by weight
It is at least 1.1% by weight. The hardenability increases as the amount of silicon, manganese, nickel, chromium, and molybdenum increases, but if the amount is too large, the machinability decreases, so an upper limit and a lower limit are provided. % By weight, 0.001 to 2.0% by weight, 0.01 to 1.5% by weight, and 0.001 to 0.5% by weight. If the amounts of phosphorus, sulfur and copper are too large, the fatigue strength is reduced, so the ranges are determined, and are respectively set to 0.005 to 0.030% by weight, 0.005 to 0.030% by weight, and 0.001 to 0.30% by weight. Aluminum is used in an amount of 0.010 to 0.100% by weight in order to refine crystal grains and prevent a decrease in toughness, and the amount of oxygen is set to 20 ppm or less to secure fatigue strength. The steel material as described above has improved hardenability,
The desired gear can be manufactured by heating to 00 ° C., attaching to a pressurized injection quenching type, and performing heat treatment.
第２の請求項にあるバナジウムは添加量が多いと鋼材
の焼入性が焼入温度の上昇に伴って増加するが、高価な
元素であるため、本発明に係る焼入硬化歯車用鋼材の第
２発明は0.02〜0.30重量％としている。If the amount of vanadium in the second claim is large, the hardenability of the steel material increases with an increase in the quenching temperature, but is an expensive element. In the second invention, the content is 0.02 to 0.30% by weight.
第３の請求項にある鉛とカルシウムのどちらか一方、
または両方を上記成分に添加すると被削性が改善される
が、あまり少ないと快削効果がなく、多すぎると効果が
飽和して素材の靭性が低下する。本発明に係る焼入硬化
歯車用鋼材の第３発明は、鉛は0.03〜0.35重量％とし、
カルシウムは0.001〜0.010重量％としている。One of the lead and calcium according to the third claim,
Alternatively, when both are added to the above components, the machinability is improved. However, if the amount is too small, the free cutting effect is not obtained, and if the amount is too large, the effect is saturated and the toughness of the material is reduced. The third invention of the steel material for a quench-hardened gear according to the present invention is such that lead is 0.03 to 0.35% by weight,
Calcium is 0.001 to 0.010% by weight.
前記第１発明または第２発明に係る焼入硬化歯車用鋼
材の材料成分にボロンを0.0003〜0.0015重量％添加する
と、焼入性が向上し、けい素、マンガン、ニッケル、ク
ロム、モリブデンを減らすことができる。ボロンの添加
量は0.0003重量％以下では焼入性改善の効果がなく、0.
0015重量％以下では効果が飽和する。When 0.0003 to 0.0015% by weight of boron is added to the material component of the steel material for the quench-hardened gear according to the first or second invention, hardenability is improved, and silicon, manganese, nickel, chromium, and molybdenum are reduced. Can be. When the amount of boron is 0.0003% by weight or less, there is no effect of improving hardenability, and
Below 0015% by weight, the effect is saturated.
以下に本発明の実施例について説明する。表１に焼入
性向上の確認のための比較鋼（A,B）とＶを添加した本
発明鋼（C,D）の化学成分を示す。Hereinafter, examples of the present invention will be described. Table 1 shows the chemical compositions of the comparative steels (A, B) and the steels of the present invention (C, D) to which V was added for confirming the improvement in hardenability.
表１で示した供試材で焼入性の試験をした結果、第１
図に示すごとく発明鋼C,Dは加熱温度に比例して焼入性
は向上しており特に発明鋼Ｄにおいて著しい。尚、焼入
性はジョミニー式一端焼入方法において硬さがHRC50と
なる焼入端からの距離で示している。As a result of a hardenability test on the test materials shown in Table 1,
As shown in the figure, the hardenability of invention steels C and D is improved in proportion to the heating temperature, and is particularly remarkable in invention steel D. The hardenability is indicated by the distance from the hardened end at which the hardness becomes HRC50 in the Jominy-type one-end hardening method.
以上述べたごとく、本発明に係る焼入硬化歯車 用鋼材の第１発明は、特に、アルミニウムにより靭性の
低下を防止できると共に、銅量および酸素量を規制して
疲労強度を確保できる。As described above, the quench-hardened gear according to the present invention In the first invention of the steel for use, in particular, the reduction of toughness can be prevented by aluminum, and the amount of copper and the amount of oxygen can be regulated to secure the fatigue strength.
第２発明は、バナジウム添加量の下限を規制したので
鋼材の焼入性を向上できる。In the second invention, since the lower limit of the amount of vanadium added is regulated, the hardenability of the steel material can be improved.
第３発明は、鉛とカルシウムの少なくとも一方の組成
範囲を限定することにより、素材の靭性を確保しつつ被
削性を向上できる。According to the third invention, the machinability can be improved while securing the toughness of the material by limiting at least one of the composition ranges of lead and calcium.
第４発明および第５発明は、第１発明および第２発明
におけるＣの添加量との相互作用により他の高価な合金
成分を低減できるので、比較的安価でしかも焼入性を調
整した鋼材を提供できる。According to the fourth and fifth inventions, since other expensive alloy components can be reduced by the interaction with the added amount of C in the first invention and the second invention, a steel material which is relatively inexpensive and whose hardenability is adjusted is used. Can be provided.
第１図：加熱温度と焼入性との関係を示す図表 Figure 1: Chart showing the relationship between heating temperature and hardenability
───────────────────────────────────────────────────── フロントページの続き (72)発明者 浜坂 直治 大阪府枚方市上野３―１―１ 株式会社 小松製作所生産技術研究室内 (56)参考文献 特開 昭61−127812（ＪＰ，Ａ) 特公 昭54−39807（ＪＰ，Ｂ２) ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Naoji Hamasaka 3-1-1 Ueno, Hirakata-shi, Osaka Komatsu Manufacturing Co., Ltd. (56) Reference JP-A-61-127812 (JP, A) 54-39807 (JP, B2)
Claims (5)
て、材料成分が重量％で炭素;0.40〜1.30、けい素;0.05
〜1.0、マンガン;0.30〜1.5、ニッケル;0.001〜2.0、ク
ロム;0.01〜1.5、モリブデン;0.001〜0.50、りん;0.005
〜0.030、硫黄;0.005〜0.030、銅;0.001〜0.30、アルミ
ニウム;0.01〜0.10を含有し、残部は鉄及び不可避的不
純物からなり、不純物として、酸素は20ppm以下である
ことを特徴とする焼入硬化歯車用鋼材。1. A gear steel material subjected to a surface hardening heat treatment, wherein the material component is carbon: 0.40 to 1.30, silicon: 0.05% by weight.
~ 1.0, manganese; 0.30-1.5, nickel; 0.001-2.0, chromium; 0.01-1.5, molybdenum; 0.001-0.50, phosphorus; 0.005
0.003 to 0.030, sulfur; 0.005 to 0.030, copper; 0.001 to 0.30, aluminum; 0.01 to 0.10, the balance being iron and unavoidable impurities, and as an impurity, quenching characterized by oxygen being 20 ppm or less. Steel material for hardened gears.
成分に、バナジウム0.02〜0.30重量％を添加することを
特徴とする焼入硬化歯車用鋼材。2. A steel material for a quench-hardened gear, characterized in that 0.02 to 0.30% by weight of vanadium is added to a material component of the steel material for a quench-hardened gear according to claim 1.
成分に、鉛0.03〜0.35重量％、カルシウム0.0010〜0.01
00重量％のうち、少なくとも一種類以上の成分を添加す
ることを特徴とする焼入硬化歯車用鋼材。3. A steel component for a quench-hardened gear according to claim 1, wherein the material components are 0.03-0.35% by weight of lead and 0.0010-0.01% of calcium.
A steel material for a quench-hardened gear, wherein at least one or more of the components is added to the steel.
成分に、ボロン0.0003〜0.0015重量％を添加することを
特徴とする焼入硬化歯車用鋼材。4. A steel material for a quench-hardened gear, wherein 0.0003 to 0.0015% by weight of boron is added to a material component of the steel material for a quench-hardened gear according to claim 1.
成分に、ボロン0.0003〜0.0015重量％を添加することを
特徴とする焼入硬化歯車用鋼材。5. A steel material for a quench-hardened gear, wherein 0.0003 to 0.0015% by weight of boron is added to a material component of the steel material for a quench-hardened gear according to claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1195280A JP2717578B2 (en) | 1989-07-27 | 1989-07-27 | Steel material for quenching hardened gears |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1195280A JP2717578B2 (en) | 1989-07-27 | 1989-07-27 | Steel material for quenching hardened gears |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0361348A JPH0361348A (en) | 1991-03-18 |
| JP2717578B2 true JP2717578B2 (en) | 1998-02-18 |
Family
ID=16338535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1195280A Expired - Lifetime JP2717578B2 (en) | 1989-07-27 | 1989-07-27 | Steel material for quenching hardened gears |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2717578B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4390576B2 (en) | 2003-03-04 | 2009-12-24 | 株式会社小松製作所 | Rolling member |
| JP4912385B2 (en) * | 2003-03-04 | 2012-04-11 | 株式会社小松製作所 | Manufacturing method of rolling member |
| JP4390526B2 (en) * | 2003-03-11 | 2009-12-24 | 株式会社小松製作所 | Rolling member and manufacturing method thereof |
| CN105177448A (en) * | 2015-10-26 | 2015-12-23 | 江苏保捷锻压有限公司 | Automobile manual transmission spiral bevel gear material and liquid forging technique thereof |
| CN114540717B (en) * | 2022-04-28 | 2022-07-12 | 北京科技大学 | Calcium-tellurium synergistic gear steel and preparation method and application thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5822957B2 (en) * | 1977-09-06 | 1983-05-12 | 富士電機株式会社 | Armature winding of rotating electrical machine |
| JPS61127812A (en) * | 1984-11-26 | 1986-06-16 | Komatsu Ltd | Heat treatment of steel |
-
1989
- 1989-07-27 JP JP1195280A patent/JP2717578B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0361348A (en) | 1991-03-18 |
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