JPH0756060B2 - Super free cutting steel with excellent machinability - Google Patents
Super free cutting steel with excellent machinabilityInfo
- Publication number
- JPH0756060B2 JPH0756060B2 JP63128615A JP12861588A JPH0756060B2 JP H0756060 B2 JPH0756060 B2 JP H0756060B2 JP 63128615 A JP63128615 A JP 63128615A JP 12861588 A JP12861588 A JP 12861588A JP H0756060 B2 JPH0756060 B2 JP H0756060B2
- Authority
- JP
- Japan
- Prior art keywords
- cutting
- machinability
- steel
- free
- content
- 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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Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は切削性に優れた超快削鋼に関し、さらに詳しく
は、JIS SUM24L（AISI 12L14）よりもさらに優れた切削
性を有し、オフイス・オートメーション機器、家庭用電
気機械、カメラ、時計等の精密部品に使用することがで
きる高速度鋼による切削性に優れた超快削鋼に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a super free-cutting steel excellent in machinability, and more specifically, it has machinability superior to JIS SUM24L (AISI 12L14) and -High-speed steel for super free-cutting steel with excellent machinability that can be used for precision parts such as automation equipment, household electric machines, cameras, and watches.
［従来技術］ 従来、精密部品等の小物部品には、超快削鋼（12L14＋T
e）が多く使用されてきている。[Prior art] Conventionally, for small parts such as precision parts, ultra-free cutting steel (12L14 + T
e) has been widely used.
この超快削鋼よりもさらに被削性に優れた快削鋼は、最
近、事務機器の高精度化により益々その利用範囲が広く
なってきている。しかし、この超快削鋼にTeが含有され
ている鋼では、現在以上の被削性を付与しようとする
と、製造が困難となり、また、コストが極めて高くな
る。Recently, the free-cutting steel, which has better machinability than the ultra-free-cutting steel, has been used more and more widely due to the higher precision of office equipment. However, in the steel containing Te in this super free-cutting steel, if it is attempted to impart machinability higher than that at present, it will be difficult to manufacture and the cost will be extremely high.
また、快削鋼に含有させる快削性元素として、Pb、Bi等
の元素は従来から良く知られているものであり、これに
ついて特開昭59-205454号公報に記載されている快削鋼
があるが、この快削鋼にはAl、Si、Ｏ、Te＋Bi＋Pbの３
快削性元素が含有されている。しかして、これら含有成
分は、Alが0.002〜0.060wt％含有されているが、Al2O3
を生成し易く、被削性を悪くし、また、Siが0.2wt％以
下含有され、このSiを含有させるとマトリックス硬度が
上昇し、工具摩耗により被削性が低下し、Ｏが0.010wt
％以下含有され、Ｏが含有されると硫化物が伸展し易く
なり、被削性が低下し、また、Te＋Bi＋Pbの含有は、特
に、Teの含有は熱間脆性となり圧延が困難となり、高温
で圧延する必要があり、歩留りが悪く、かつ、コスト高
となるという問題がある。Further, as free-cutting elements to be contained in free-cutting steel, elements such as Pb and Bi are well known in the art, and the free-cutting steels described in JP-A-59-205454 for this are known. There are three types of free cutting steel: Al, Si, O, Te + Bi + Pb.
Contains free-cutting elements. Therefore, although Al contained 0.002 to 0.060 wt% in these contained components, Al 2 O 3
Is easily generated, machinability is deteriorated, and Si is contained in an amount of 0.2 wt% or less. When Si is contained, matrix hardness increases, machinability decreases due to tool wear, and O is 0.010 wt%.
% Or less, and if O is contained, the sulfide easily extends and the machinability deteriorates. In addition, the content of Te + Bi + Pb, especially the content of Te causes hot brittleness, making rolling difficult, and There is a problem that it needs to be rolled, the yield is low, and the cost is high.
従って、従来においては優れた被削性を有し、製造が比
較的に容易で、さらに、コストの低い快削鋼が要望され
ていた。Therefore, conventionally, there has been a demand for free-cutting steel having excellent machinability, relatively easy to manufacture, and low cost.
［発明が解決しようとする課題］ 本発明は上記に説明したような、従来の快削鋼の種々の
問題点に鑑み、本発明者が鋭意研究を行ない、検討を重
ねた結果、快削性元素としてはPbとBiの２元素を含有さ
せ、さらに、Al、Siの含有量が極めて低いリムド系鋼と
し、製造が容易で、かつ、被削性が極めて良好な高速度
鋼による切削性に優れた超快削鋼を開発したのである。[Problems to be Solved by the Invention] In view of various problems of the conventional free-cutting steel as described above, the present invention has been earnestly studied by the present inventor, and as a result of repeated studies, the free-cutting property was obtained. Two elements, Pb and Bi, are contained as elements, and the rimmed steel has a very low content of Al and Si. It is easy to manufacture and has excellent machinability. We have developed excellent super-free cutting steel.
［課題を解決するための手段］ 本発明に係る切削性に優れた超快削鋼の特徴とするとこ
ろは、 Ｃ≦0.2wt％、Si＜0.02wt％、 Mn0.80〜1.20wt％、Al＜0.002wt％、 O0.015〜0.030wt％、P0.01〜0.12wt％、 S0.13〜0.37wt％、Pb0.075〜0.49wt％、 Bi0.075〜0.49wt％ を含有し、かつ、 Bi/（Pb＋Bi）0.30〜0.70 Bi＋Pb0.25〜0.70 であり、残部Feおよび不可避不純物からなることにあ
る。[Means for Solving the Problems] The features of the super free-cutting steel excellent in machinability according to the present invention are that C ≦ 0.2 wt%, Si <0.02 wt%, Mn0.80 to 1.20 wt%, Al <0.002wt%, O0.015 to 0.030wt%, P0.01 to 0.12wt%, S0.13 to 0.37wt%, Pb0.075 to 0.49wt%, Bi0.075 to 0.49wt%, and Bi / (Pb + Bi) 0.30 to 0.70 Bi + Pb 0.25 to 0.70, the balance being Fe and inevitable impurities.
本発明に係る切削性に優れた超快削鋼について、以下詳
細に説明する。The super free-cutting steel excellent in machinability according to the present invention will be described in detail below.
先ず、本発明に係る切削性に優れた超快削鋼の含有成分
および含有割合について説明する。First, the content components and content ratio of the ultra-free cutting steel excellent in machinability according to the present invention will be described.
Ｃは含有量が0.1wt％を超えると被削性が低下する。よ
って、Ｃ含有量は≦0.2wt％とする。If the content of C exceeds 0.1% by weight, the machinability deteriorates. Therefore, the C content is ≤0.2 wt%.
Siは含有量が0.02wt％を超えると高速度鋼による被削性
を低下させる。よって、Si含有量は＜0.02wt％とする。If the Si content exceeds 0.02 wt%, the machinability due to the high speed steel deteriorates. Therefore, the Si content is <0.02 wt%.
Mnは含有量が0.80wt％未満では熱間圧延時に鋼材表面疵
が発生し易く、また、1.20wt％を越えて含有されると強
度が高くなり、被削性が悪くなる。よって、Mn含有量は
0.80〜1.20wt％とする。If the content of Mn is less than 0.80 wt%, steel surface flaws are likely to occur during hot rolling, and if it exceeds 1.20 wt%, the strength becomes high and the machinability deteriorates. Therefore, the Mn content is
0.80 to 1.20 wt%
Alは鋼中の酸素と反応してAl2O3介在物を形成し易く、
工具寿命を短くし、また、硫化物がオーステナイト粒界
に析出して表面割れが発生し易くなる。よって、Al含有
量は＜0.002wt％とする。Al easily reacts with oxygen in steel to form Al 2 O 3 inclusions,
The tool life is shortened, and sulfides are likely to precipitate on the austenite grain boundaries to easily cause surface cracks. Therefore, the Al content is <0.002 wt%.
Ｏは含有量が0.015wt％未満では圧延によりMnSが伸展し
て高速度鋼工具による被削性が低下し、また、0.030wt
％を越えて含有されると塑性変形能が低下して被削性が
悪くなる。よって、Ｏ含有量は0.015〜0.030wt％とす
る。If the O content is less than 0.015 wt%, MnS will be expanded by rolling and the machinability of high-speed steel tools will be reduced.
%, The plastic deformability is lowered and the machinability is deteriorated. Therefore, the O content is 0.015 to 0.030 wt%.
Ｐは鋼の切削仕上げ面を改善する元素であり、含有量が
0.01wt％未満ではこの効果は少なく、また、0.12wt％を
越えて含有させても効果はあまり上がらない。よって、
Ｐ含有量は0.01〜0.12wt％とする。P is an element that improves the finished surface of steel, and its content is
If it is less than 0.01 wt%, this effect is small, and if it exceeds 0.12 wt%, the effect does not increase so much. Therefore,
The P content is 0.01 to 0.12 wt%.
Ｓは含有量が0.13wt％未満では被削性を改善する効果が
有効に発揮することができず、また、0.37wt％を越えて
多量に含有されると鋼の機械的性質の劣化が著しくな
る。よって、Ｓ含有量は0.13〜0.37wt％とする。If the S content is less than 0.13 wt%, the effect of improving the machinability cannot be effectively exerted, and if the S content exceeds 0.37 wt%, the mechanical properties of the steel deteriorate significantly. Become. Therefore, the S content is 0.13 to 0.37 wt%.
Pb、Biは単に含有させるのではなく、低融点の介在物と
なるように含有割合を選択することにより、広い範囲の
切削条件により切削を行なうことが可能となり、そし
て、自動盤によりフォーミング加工を行なって、工具刃
先の平均温度を測定すると、使用切削条件の下では約25
0℃以下であることがわかった。従って、Pbの融点が327
℃、Biの融点は271℃であるから、上記介在物の融点を2
50℃以下となるように制御すれば、被削性はPb、Biの単
独に含有している快削鋼よりも優れたものとなる。By selecting the content ratio of Pb and Bi so that the inclusions have a low melting point, rather than merely containing them, it becomes possible to perform cutting under a wide range of cutting conditions, and the forming process is performed by an automatic lathe. When the average temperature of the cutting edge of the tool is measured, it is about 25 under the cutting conditions used.
It was found to be below 0 ° C. Therefore, the melting point of Pb is 327.
℃, the melting point of Bi is 271 ℃, the melting point of the inclusions above 2
When the temperature is controlled to be 50 ° C or lower, the machinability becomes superior to that of the free-cutting steel containing Pb and Bi alone.
このような効果を発揮させるためには、PbおよびBi含有
量は0.075〜0.49wt％とし、かつ、 Bi/（Pb＋Bi）＝0.30〜0.70 Pb＋Bi＝0.25〜0.70wt％ の特性式を満足しなければならないのである。In order to exert such effects, the Pb and Bi contents must be 0.075 to 0.49 wt% and the characteristic formula of Bi / (Pb + Bi) = 0.30 to 0.70 Pb + Bi = 0.25 to 0.70 wt% must be satisfied. It doesn't happen.
［実施例］ 次に、本発明に係る切削性に優れた超快削鋼の実施例を
比較鋼とともに説明する。[Examples] Next, examples of super free-cutting steel excellent in machinability according to the present invention will be described together with comparative steel.
実施例 第１表に示す含有成分および含有割合の鋼を溶製して、
鍛造、圧延、冷間引抜後、自動盤により切削試験を行な
った。Example Steels having the components and content ratios shown in Table 1 were melted,
After forging, rolling, and cold drawing, a cutting test was performed with an automatic lathe.
（Pb＋Bi）の含有量が一定値となるようにして、PbとBi
との含有量を変化させた鋼により、切削試験を行なった
結果を第１図に示す。この第１図において、切削条件
は、切削速度50m/min、送り0.03mm/rev、切込深さ0.73m
mである。 Set the content of (Pb + Bi) to a constant value so that Pb and Bi
Fig. 1 shows the results of a cutting test performed on steels having different contents of and. In Fig. 1, the cutting conditions are: cutting speed 50m / min, feed 0.03mm / rev, depth of cut 0.73m.
m.
また、（Pb＋Bi）を0.16、0.26、0.34の３水準に選択し
た。その結果、何れの水準においても、Ｋ＝｛Bi（wt
％）｝／［｛Pb（wt％）｝＋｛Bi（wt％）｝］＝0.56 となる割合において、12L14系超快削鋼（規格鋼）のPb
含有量0.35wt％の材料よりも、被削性（仕上げ面粗さ）
が優れているものである。Moreover, (Pb + Bi) was selected at three levels of 0.16, 0.26, and 0.34. As a result, K = {Bi (wt
%)} / [{Pb (wt%)} + {Bi (wt%)}] = 0.56, the Pb of 12L14 series super free cutting steel (standard steel)
Machinability (finished surface roughness) compared to a material with a content of 0.35 wt%
Is excellent.
また、自動盤を使用した切削試験時、熱電対法により切
削温度を測定したところ、約250℃の温度であったの
で、この温度以下の溶融点を有する0.30≦Ｋ≦0.70の介
在物を生成させるように、含有割合を選択するのがよ
い。In addition, when the cutting temperature was measured by the thermocouple method during the cutting test using the automatic lathe, it was found to be about 250 ° C. Therefore, inclusions of 0.30 ≦ K ≦ 0.70 having a melting point below this temperature were generated. Therefore, it is preferable to select the content ratio.
従って、第１図に示すように、本発明に係る切削性に優
れた超快削鋼は、比較鋼に比べて平均仕上げ面粗さが小
さく、優れていることがわかる。Therefore, as shown in FIG. 1, it is understood that the super free-cutting steel according to the present invention having excellent machinability has a smaller average finished surface roughness than the comparative steel.
また、第２図に示すように、切削速度の相違による平均
仕上げ面粗さにおいても、本発明に係る切削性に優れた
超快削鋼は、比較鋼に比べて優れていることがわかる。
第２図において、切削条件は、送り0.03mm/rev、切込深
さ0.73mmである。Further, as shown in FIG. 2, it is understood that the super free-cutting steel excellent in machinability according to the present invention is superior to the comparative steel also in the average finished surface roughness due to the difference in cutting speed.
In FIG. 2, the cutting conditions are a feed of 0.03 mm / rev and a cutting depth of 0.73 mm.
［発明の効果］ 以上説明したように、本発明に係る切削性に優れた超快
削鋼は上記の構成であるから、高速度鋼による切削にお
いて優れた被削性を有し、さらに、切削による超快削鋼
の仕上げ面粗さも極めて平滑であるという効果を有する
ものである。[Effects of the Invention] As described above, since the super-free-cutting steel excellent in machinability according to the present invention has the above-mentioned constitution, it has excellent machinability in cutting by high speed steel, and further, The finished surface roughness of the super free-cutting steel according to is also extremely smooth.
第１図はBi/（Pb＋Bi）×100と平均仕上げ面粗さとの関
係を示す図、第２図は切削速度と平均仕上げ面粗さとの
関係を示す図である。FIG. 1 is a diagram showing the relationship between Bi / (Pb + Bi) × 100 and average finished surface roughness, and FIG. 2 is a diagram showing the relationship between cutting speed and average finished surface roughness.
Claims (1)
とする切削性に優れた超快削鋼。1. C≤0.2 wt%, Si <0.02 wt%, Mn0.80-1.20 wt%, Al <0.002 wt%, O0.015-0.030 wt%, P0.01-0.12 wt%, S0.13 〜0.37wt%, Pb0.075〜0.49wt%, Bi0.075〜0.49wt% and Bi / (Pb + Bi) 0.30〜0.70 Bi ＋ Pb0.25〜0.70 with the balance Fe and unavoidable impurities A super free-cutting steel with excellent machinability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63128615A JPH0756060B2 (en) | 1988-05-25 | 1988-05-25 | Super free cutting steel with excellent machinability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63128615A JPH0756060B2 (en) | 1988-05-25 | 1988-05-25 | Super free cutting steel with excellent machinability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01298138A JPH01298138A (en) | 1989-12-01 |
| JPH0756060B2 true JPH0756060B2 (en) | 1995-06-14 |
Family
ID=14989168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63128615A Expired - Lifetime JPH0756060B2 (en) | 1988-05-25 | 1988-05-25 | Super free cutting steel with excellent machinability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0756060B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2614656B2 (en) * | 1989-04-14 | 1997-05-28 | 株式会社神戸製鋼所 | Pb-Bi free-cutting steel and production method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0776374B2 (en) * | 1985-09-19 | 1995-08-16 | 大同特殊鋼株式会社 | Manufacturing method of free-cutting steel for pressure-resistant parts |
| JPH0737658B2 (en) * | 1986-02-20 | 1995-04-26 | 大同特殊鋼株式会社 | Free cutting steel |
| JPH0772322B2 (en) * | 1986-11-10 | 1995-08-02 | 大同特殊鋼株式会社 | Free cutting steel |
-
1988
- 1988-05-25 JP JP63128615A patent/JPH0756060B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01298138A (en) | 1989-12-01 |
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