JPH0756061B2 - Sulfur composite free cutting steel - Google Patents
Sulfur composite free cutting steelInfo
- Publication number
- JPH0756061B2 JPH0756061B2 JP19859088A JP19859088A JPH0756061B2 JP H0756061 B2 JPH0756061 B2 JP H0756061B2 JP 19859088 A JP19859088 A JP 19859088A JP 19859088 A JP19859088 A JP 19859088A JP H0756061 B2 JPH0756061 B2 JP H0756061B2
- Authority
- JP
- Japan
- Prior art keywords
- steel
- cutting
- sulfur composite
- composite free
- less
- 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 - Fee Related
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、硫黄複合快削鋼に関する。TECHNICAL FIELD The present invention relates to a sulfur composite free-cutting steel.
従来の技術 硫黄複合快削鋼は、Al、Si等の強脱酸元素を含まないリ
ムド鋼であつて、古くより知られている。しかし、最
近、かかる快削鋼の製造が造塊法から連続鋳造法に変わ
りつつあり、このように、連続鋳造法によるときは、鋼
中のMnSが小さくなるため、被削性が低下する。他方、
快削鋼の使用においても、従来、その切削が自動盤にて
高速度鋼工具を用いてなされていたところ、超硬合金工
具による切削が増加しつつあるが、硫黄複合快削鋼は、
かかる超硬合金工具による切削性が必らずもよくない。2. Description of the Related Art Sulfur composite free-cutting steel is a rimmed steel that does not contain strong deoxidizing elements such as Al and Si, and has been known for a long time. However, recently, the production of such free-cutting steel is changing from the ingot-making method to the continuous casting method. Thus, when the continuous casting method is used, MnS in the steel becomes small, so that the machinability deteriorates. On the other hand,
Even in the use of free-cutting steel, conventionally, when the cutting was done with a high-speed steel tool on an automatic lathe, the cutting with a cemented carbide tool is increasing, but the sulfur composite free-cutting steel is
Machinability with such cemented carbide tools is not necessarily good.
発明が解決しようとする課題 本発明者らは、硫黄複合快削鋼における上記した問題を
解決するために鋭意研究した結果、硫黄複合快削鋼を脱
酸し、これを連続鋳造法にて製造するとき、超硬合金工
具による切削性は向上するものの、自動盤にて高速度鋼
工具を用いて切削するとき、その被削性が著しく劣るこ
とを見出した。そこで、発明者らは、かかる問題を解決
するために、Ｓと共にCa及びBiを複合添加することによ
つて、高速度鋼工具による切削性をも改善し得ることを
見出して、本発明に至つたものである。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As a result of earnest research to solve the above-mentioned problems in sulfur composite free-cutting steel, the present inventors deoxidized sulfur composite free-cutting steel and produced it by a continuous casting method. However, it was found that the machinability of the cemented carbide tool is improved, but the machinability of the automatic lathe is significantly poor when the high-speed steel tool is used for cutting. Therefore, in order to solve such a problem, the inventors have found that the addition of Ca and Bi together with S can improve the machinability by a high-speed steel tool, and have reached the present invention. It is an ivy.
課題を解決するための手段 本発明による硫黄複合快削鋼は、重量％で C 0.60％以下、 Mn 0.3〜2.0％以下、 P 0.12％以下、 S 0.12〜0.40％、 Al 0.050％以下、 Si 0.50％以下、 O 0.0005〜0.01％、 Ca 0.001〜0.01％、 Bi 0.01〜0.30％、 残部鉄及び不可避的不純物よりなることを特徴とする。Means for Solving the Problems The sulfur composite free-cutting steel according to the present invention is, by weight%, C 0.60% or less, Mn 0.3 to 2.0% or less, P 0.12% or less, S 0.12 to 0.40%, Al 0.050% or less, Si 0.50. % Or less, O 0.0005 to 0.01%, Ca 0.001 to 0.01%, Bi 0.01 to 0.30%, and the balance iron and unavoidable impurities.
本発明による硫黄複合快削鋼におけるＣ、Mn及びＰ量
は、通常の硫黄複合快削鋼が含有する範囲と同じであ
る。The amounts of C, Mn, and P in the sulfur composite free-cutting steel according to the present invention are the same as the range contained in a normal sulfur composite free-cutting steel.
Al及びSiは、脱酸元素として添加されるが、過多に添加
しても、徒に鋼性造費用を高めるのみであり、特に、Si
は、硬さを増し、被削性を劣化させるので、添加量は、
Alについては0.050％以下、Siについては0.50％以下と
する。Al及びSiは、いずれか一方のみの添加でもよい。Al and Si are added as deoxidizing elements, but even if added in excess, they only increase the steel forming cost, and especially Si and
Increases the hardness and deteriorates the machinability, so the addition amount is
Al is 0.050% or less and Si is 0.50% or less. Only one of Al and Si may be added.
Ｏ含有量を0.0005％以下とすることは、鋼製造費用の非
常な高騰を招き、他方、0.01％を越えるときは、超硬合
金工具の寿命を劣化させるので、Ｏ量は0.0005〜0.001
％の範囲とする。When the O content is 0.0005% or less, the steel manufacturing cost is extremely increased. On the other hand, when it exceeds 0.01%, the life of the cemented carbide tool is deteriorated, so the O content is 0.0005 to 0.001.
The range is%.
Caは、硫化物として鋼に添加される。硫化物の球状化の
ためには、少なくとも0.001％の添加が必要である。し
かし、0.01％を越えるときは、製造費用を高くする。Ca is added to steel as a sulfide. At least 0.001% addition is required for spheroidization of sulphides. However, when it exceeds 0.01%, the manufacturing cost is increased.
Biは、0.03％以下の添加にて、被削性改善と硫化物球状
化に有効である。しかし、過多に添加するときは、鋼中
にてBiが偏折、鋼材品質を低下させるので、添加量は0.
30％以下とする。Bi is effective in improving machinability and spheroidizing sulfide when added in an amount of 0.03% or less. However, if too much is added, Bi will be unevenly distributed in the steel and the quality of the steel will be deteriorated.
30% or less.
発明の効果 以上のように、本発明による硫黄複合快削鋼は脱酸し、
連続鋳造法によつて製造することによつて、超硬合金工
具におる被削性にすぐれ、更に、Ca及びBiを複合添加す
ることによつて、Ca単独添加の複合快削鋼に比べて、硫
化物の球状化度が高く、高速度鋼工具による被削性にも
すぐれる。As described above, the sulfur composite free-cutting steel according to the present invention is deoxidized,
By producing by the continuous casting method, excellent in machinability in cemented carbide tools, further, by adding Ca and Bi in combination, compared to the composite free-cutting steel of Ca alone addition High degree of spheroidization of sulfide and excellent machinability with high speed steel tools.
実施例 以下に実施例を挙げて本発明を説明するが、本発明はこ
れら実施例により何ら限定されるものではない。EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.
第１表に示す化学成分を有する鋼を溶製した。A1は従来
の硫黄快削鋼としての比較鋼、A2鋼は、Si脱酸した比較
鋼、A3鋼は、Al及びSi脱酸し、Caを添加した比較鋼であ
る。B1鋼、B2鋼及びB3鋼は、Al及びSi脱酸し、これにCa
とBiとを複合添加してなる本発明による硫黄複合快削鋼
である。Steel having the chemical composition shown in Table 1 was melted. A1 is a comparative steel as a conventional sulfur free-cutting steel, A2 steel is a comparative steel deoxidized with Si, and A3 steel is a comparative steel deoxidized with Al and Si and added with Ca. B1 steel, B2 steel and B3 steel are deoxidized with Al and Si, and Ca
It is a sulfur composite free-cutting steel according to the present invention, which is a composite addition of Si and Bi.
これらのそれぞれの鋼を22mm径に加工した後、縦断面上
の硫化物寸法を画像解析装置によつて測定した。結果を
第１図に示すように、A1鋼は、Al及びSiを添加していな
いために、硫化物が 丸く且つ大きい。A2鋼は、Siを添加しているために、A1
鋼に比べて、硫化物が長く伸びている。また、A3鋼は、
Al及びSiを添加しているが、Caの添加効果によつて、硫
化物の寸法は幾らか小さいものの、硫化物の長軸L/短軸
Ｗ比は、A1鋼とほぼ等しく、丸い。After processing each of these steels to a diameter of 22 mm, the sulfide size on the longitudinal section was measured by an image analyzer. As shown in Fig. 1, the results show that A1 steel does not contain Al and Si, and therefore has no sulfide. Round and big. A2 steel has A1 due to the addition of Si.
Compared to steel, sulfide is elongated. Also, A3 steel is
Although Al and Si are added, the major axis L / minor axis W ratio of the sulfide is almost equal to that of the A1 steel and round, although the dimension of the sulfide is somewhat small due to the effect of adding Ca.
これら比較鋼に対して、Caのみを添加したA3鋼に比べ
て、本発明によるB1鋼、B2鋼及びB3鋼は、Ca及びBiの複
合添加の効果によつて、硫化物は、丸く且つ大きい。こ
の効果は、Bi量が多いほど著しい。このように、本発明
による快削鋼においては、硫化物が丸く、大きいので、
自動盤切削時の仕上面あらさにすぐれる。For these comparative steels, compared to A3 steel added with only Ca, B1 steel, B2 steel and B3 steel according to the present invention, due to the effect of the combined addition of Ca and Bi, sulfides are round and large. . This effect becomes more remarkable as the amount of Bi increases. Thus, in the free-cutting steel according to the present invention, since the sulfide is round and large,
Excellent surface finish during automatic lathe cutting.
第１図に、旋盤を用いて、上記それぞれの鋼を切削した
ときの超硬合金工具寿命を示す。本発明鋼は、比較鋼に
比べて、超硬合金工具寿命にすぐれることが示される。FIG. 1 shows the cemented carbide tool life when each of the above steels is cut using a lathe. It is shown that the steel of the present invention has an excellent tool life of cemented carbide as compared with the comparative steel.
切削条件は次のとおりである。The cutting conditions are as follows.
工具 P10 切削速度 200m/分 送り 0.25mm/rev. 切込み 1.5mm 切削油 なし 寿命基準 VB＝0.2mm 第２図は、自動盤を用いて、上記それぞれの鋼をフオー
ミング加工したときの仕上面あらさの経過曲線を示す。
本発明鋼は、非常にすぐれた仕上面あらさを示す。Tool P10 Cutting speed 200m / min Feed 0.25mm / rev. Depth of cut 1.5mm No cutting oil Life standard VB = 0.2mm Fig. 2 shows the finish surface roughness when each of the above steels is formed using an automatic lathe. The course curve is shown.
The steel of the present invention exhibits a very good finished surface roughness.
切削条件は次のとおりである。The cutting conditions are as follows.
切削機械 単軸自動盤 切削速度 70m/分 工具 SKH4 送り 0.05mm/rev. 切込み 2.0mm 切削油 水不溶性油Cutting machine Single axis automatic lathe Cutting speed 70m / min Tool SKH4 Feed 0.05mm / rev. Depth of cut 2.0mm Cutting oil Water insoluble oil
第１図は、本発明鋼及び比較鋼を旋盤を用いて切削した
ときの超硬合金工具寿命を示すグラフ、第２図は、本発
明鋼及び比較鋼を自動盤を用いてフオーミング加工した
ときの仕上面あらさの経過曲線を示すグラフである。FIG. 1 is a graph showing the life of cemented carbide tools when the present invention steel and comparative steel are cut using a lathe, and FIG. 2 is when the present invention steel and comparative steel are subjected to forming using an automatic lathe. 3 is a graph showing a progress curve of the finished surface roughness.
Claims (1)
黄複合快削鋼。[Claim 1] By weight%, C 0.60% or less, Mn 0.3 to 2.0% or less, P 0.12% or less, S 0.12 to 0.40%, Al 0.050% or less, Si 0.50% or less, O 0.0005 to 0.01%, Ca 0.001 to 0.01%, Bi 0.01-0.30%, balance sulfur and unavoidable impurities, sulfur compound free-cutting steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19859088A JPH0756061B2 (en) | 1988-08-08 | 1988-08-08 | Sulfur composite free cutting steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19859088A JPH0756061B2 (en) | 1988-08-08 | 1988-08-08 | Sulfur composite free cutting steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0247242A JPH0247242A (en) | 1990-02-16 |
| JPH0756061B2 true JPH0756061B2 (en) | 1995-06-14 |
Family
ID=16393719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19859088A Expired - Fee Related JPH0756061B2 (en) | 1988-08-08 | 1988-08-08 | Sulfur composite free cutting steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0756061B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03186448A (en) * | 1989-12-15 | 1991-08-14 | Takata Kk | Air bag for passenger |
-
1988
- 1988-08-08 JP JP19859088A patent/JPH0756061B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0247242A (en) | 1990-02-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |