JPH02209429A - Production of steel bar stock excellent in cold shearing property - Google Patents
Production of steel bar stock excellent in cold shearing propertyInfo
- Publication number
- JPH02209429A JPH02209429A JP3220189A JP3220189A JPH02209429A JP H02209429 A JPH02209429 A JP H02209429A JP 3220189 A JP3220189 A JP 3220189A JP 3220189 A JP3220189 A JP 3220189A JP H02209429 A JPH02209429 A JP H02209429A
- Authority
- JP
- Japan
- Prior art keywords
- steel bar
- bar material
- bar stock
- cold
- cold shearing
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 53
- 239000010959 steel Substances 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 238000010008 shearing Methods 0.000 title abstract 3
- 238000005520 cutting process Methods 0.000 claims abstract description 32
- 239000010410 layer Substances 0.000 claims abstract description 13
- 239000002344 surface layer Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 52
- 238000005096 rolling process Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000010791 quenching Methods 0.000 abstract description 4
- 230000000171 quenching effect Effects 0.000 abstract description 4
- 238000005496 tempering Methods 0.000 abstract description 3
- 230000000717 retained effect Effects 0.000 abstract 2
- 238000001816 cooling Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 238000010273 cold forging Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 generally Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は冷間シャー切断性に優れる棒鋼素材の製造方法
に関し、詳細には、冷間シャー切断により定寸切断して
用いられる冷間鍛造用等の棒鋼素材として好適な、冷間
シャー切断性に優れる棒鋼素材の製造方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a steel bar material that has excellent cold shear cutting properties, and specifically relates to a method for producing a steel bar material that is excellent in cold shear cutting properties, and specifically relates to a method for manufacturing a steel bar material that is cut to a fixed size by cold shear cutting. The present invention relates to a method for manufacturing a steel bar material having excellent cold shear cutting properties and suitable as a steel bar material for industrial purposes.
一般に、冷間曲げ加工や、冷間鍛造等の冷間塑性加工に
より成形される比較的に小型な鋼製品用の素材としては
、長尺な棒鋼素材を定寸切断したものが多用されている
。また、これら素材としては、一般に、低炭素鋼および
低合金鋼からなる棒鋼素材が多用され、これらの定寸切
断には、切断効率の高い冷間シャー切断が最も多く採用
されている。In general, long steel bars cut to size are often used as materials for relatively small steel products formed by cold bending or cold plastic processing such as cold forging. . Further, as these materials, generally, steel bar materials made of low carbon steel and low alloy steel are often used, and cold shear cutting, which has high cutting efficiency, is most often used for cutting these to size.
一方、従来、これら冷間シャー切断して用いられる棒鋼
素材は、−１ｉ１Ｑに、熱間素圧延された中間素材を、
更に熱間仕上げ圧延し、その仕上げ圧延後に、自然冷却
ないしは徐冷却させる方法で製造されており、また、そ
の断面硬度は、通常、はぼ均一で、かつ比較的に低くい
ものとされていた。On the other hand, the steel bar materials conventionally used by cold shear cutting are -1i1Q, hot-rolled intermediate materials,
It is manufactured by further hot finish rolling, followed by natural cooling or slow cooling, and its cross-sectional hardness is usually fairly uniform and relatively low. .
しかし、これら従来の棒鋼素材は、その断面硬度が、は
ぼ均一で、かつ比較的に低くされているために、冷間シ
ャー切断に際して、その切断面の切断方向の端部にパか
えり”が発生し易く、また、この′かえり″”は、例え
ば、冷間鍛造用素材として用いるとき、かぶさり疵の原
因となる等、爾後の工程に支障を来すものとなる。However, because the cross-sectional hardness of these conventional steel bar materials is fairly uniform and relatively low, there is a burr at the end of the cut surface in the cutting direction during cold shear cutting. This ``burr'' is likely to occur, and when used as a material for cold forging, for example, this ``burr'' may cause overlapping defects and cause problems in subsequent processes.
そして、このパかえり°゛の発生は、シャー装置の上下
切断ハイドの間に、必須条件として、所定のクリアラン
スが設けられることに起因するもので、棒鋼素材の冷間
シャー切断に際して、当該棒鋼素材の切断面の表層部の
材料が、剪断力により、この上下切断バイトのクリアラ
ンスからなる小さな間隙に流れ込むことにより形成され
る。The occurrence of this burr is caused by the fact that a predetermined clearance is provided as an essential condition between the upper and lower cutting hides of the shear device. It is formed by the material on the surface layer of the cut surface flowing into the small gap formed by the clearance between the upper and lower cutting tools due to shear force.
このため、従来は、孔型刃パイＩ−等の特別の切断用バ
イトを用いたり、予め棒鋼素材に引抜き加工を施し、あ
えて加工硬化させて゛かえり゛の発生の防止を図るとか
、更には、切断後に、発生した゛かえり°“を除去する
工程を加えたりするなど、種々の対策がなされていた。For this reason, in the past, special cutting tools such as the hole-shaped blade Pi-I were used, or the steel bar material was subjected to drawing processing in advance to work harden it to prevent the occurrence of burrs. Various countermeasures have been taken, such as adding a step to remove any burrs that occur after cutting.
しかし、孔型刃ハイド等の特別の切断用バイトを用いる
ときは、その制作費が高くつくと共に、その管理が煩雑
となり、また、予め引抜き加工を施す場合は、そのため
の工数と工費が増加し、そしてまた、“かえり°゛を除
去する工程は、煩雑かつ工数を要するものとなるという
問題があった。However, when using a special cutting tool such as a hole-shaped blade Hyde, the production cost is high and its management becomes complicated, and when drawing processing is performed in advance, the number of man-hours and labor costs increase. Furthermore, there is another problem in that the process of removing burrs is complicated and requires a lot of man-hours.
そこで、本発明者等は、上記゛かえり“の発生を防止す
べく、材料特性面より鋭意検潤を重ねた結果、棒鋼素材
の表層部のみを硬化させるとき、所期の目的を達成する
ことが可能であるとの知見を得て、本発明をなしたもの
である。Therefore, in order to prevent the occurrence of the above-mentioned burrs, the inventors of the present invention have carried out extensive research in terms of material properties, and have found that when only the surface layer of a steel bar material is hardened, the intended purpose can be achieved. The present invention was made based on the knowledge that this is possible.
すなわち、本発明は、その冷間シャー切断に際して、切
断面の切断方向の端部に“かえり”の発生がなく、しか
も、容易かつ効率良く切断し得る冷間シャー切断性に優
れる棒鋼素材の製造方法を提供することを目的とするも
のである。That is, the present invention is directed to the production of a steel bar material that does not produce burrs at the ends of the cut surface in the cutting direction during cold shear cutting, and has excellent cold shear cutting properties that can be easily and efficiently cut. The purpose is to provide a method.
上記の目的を達成するために、本発明に係る冷間シャー
切断性に優れる棒鋼素材の製造方法は、熱間仕上げ圧延
直後に、その表面を、２００℃以下とならないように、
５秒〜１５秒間の範囲内にて水冷して焼入れすると共に
、内部保有熱にてセルフテンパーさせて、その断面表層
部に硬化層を形成させるものである。In order to achieve the above object, the method for manufacturing a steel bar material with excellent cold shear cutting properties according to the present invention includes: immediately after hot finish rolling, the surface of the bar material is heated so that the temperature does not drop below 200°C.
It is water-cooled and quenched within a range of 5 to 15 seconds, and self-tempered using internal heat to form a hardened layer on the surface layer of the cross section.
本発明の棒鋼素材の製造方法においては、熱間仕上げ圧
延直後に、その表面を５秒〜１５秒間の短時間水冷する
ので、その表層部のみを焼入れ硬化させて、その断面表
層部に焼入れ硬化層を形成させることができ、また、そ
の表面を２００℃以下とならないように水冷することで
、その内部保有熱にてセルフテンパーさせて、その焼入
れ硬化層の硬度を、冷間シャー切断に適する範囲内のも
のとし得る。In the method for manufacturing a steel bar material of the present invention, the surface is water-cooled for a short time of 5 to 15 seconds immediately after hot finish rolling, so that only the surface layer is quenched and hardened, and the cross-sectional surface layer is quenched and hardened. By cooling the surface with water so that the temperature does not drop below 200°C, the hardened layer can be self-tempered by its internal heat, making the hardened layer suitable for cold shear cutting. may be within the range.
そして、上述の方法にて製造された棒鋼素材は、その断
面表層部に硬化層を有するので、冷間シャー切断に際し
て、その表層部がシャー装置の上下切断ハイド間のクリ
アランスからなる小さな間隙に流れ込むことを抑制され
、その切断面端部に°゛かえり”を形成することがない
。一方、“°かえり°゛の形成に関与しない内部の硬度
は、比較的に低（抑えることができるので、その冷間シ
ャー切断効率の低下を抑制し得る。The steel bar material manufactured by the above method has a hardened layer on the surface layer of its cross section, so during cold shear cutting, the surface layer flows into the small gap formed by the clearance between the upper and lower cutting hides of the shear device. This prevents the formation of burrs at the edges of the cut surface.On the other hand, the hardness of the interior, which does not participate in the formation of burrs, is relatively low (and can be suppressed). The reduction in cold shear cutting efficiency can be suppressed.
なお、本発明において、表面の水冷時間を５秒〜１５秒
間の範囲内としたのは、５秒未満では、その焼入れ効果
が得られず、一方、１５秒を超えて水冷すると、その焼
入れ硬化層が必要以上に厚くなり、得られた棒鋼素材が
冷間シャー切断し難いものとなるからである。In addition, in the present invention, the water cooling time of the surface is set in the range of 5 seconds to 15 seconds because if the water cooling time is less than 5 seconds, the hardening effect cannot be obtained, whereas if the water cooling time is more than 15 seconds, the hardening effect will not be obtained. This is because the layer becomes thicker than necessary, and the obtained steel bar material becomes difficult to cold-shear cut.
また、その表面を２００℃以下とならないように水冷す
るものとしたのは、表面温度が２００℃以下となるが如
き冷却を加えると、その内部保有熱量が低下すると共に
、この内部保有熱によるセルフテンパー効果が低下して
、焼入れ硬化層の硬度を所定範囲内のものとし得なくな
り、結果として、得られた棒鋼素材が冷間シャー切断し
難いものとなるからである。In addition, the reason why the surface was water-cooled to prevent the temperature from falling below 200°C was that if the surface temperature were to be cooled to below 200°C, its internal heat capacity would decrease, and this internal heat would cause self-reflection. This is because the tempering effect decreases, making it impossible to keep the hardness of the hardened layer within a predetermined range, and as a result, the obtained steel bar material becomes difficult to cold shear cut.
〔実施例］
Ｃ； ０．２６． Ｓｉ ； ０．２Ｇ、 Ｐ Ｈ０，
０１４，Ｓ ； ０．０１Ｂ。[Example] C; 0.26. Si; 0.2G, P H0,
014,S; 0.01B.
Ｃｕ ： ０．０１． Ｎｉ ； ０．０１． Ｃｒ
； ０．０１を重量％含み、残部をＦｅとする構造用炭
素鋼からなる中間素材を、直径４２ｍｍの棒鋼に、常法
により熱間仕上げ圧延すると共に、この熱間仕上げ圧延
直後の棒鋼を、内径側に多数の冷却水噴射ノズルを設け
た円筒状の水冷装置内を経由させて、連続的に、その表
面を１０秒間水冷処理することにより、本実施例の棒鋼
素材を製造した。このとき、棒鋼素材の圧延仕上げ温度
は９００℃であり、水冷処理直後の表面温度は４２０℃
であった。Cu: 0.01. Ni; 0.01. Cr
; An intermediate material made of structural carbon steel containing 0.01% by weight and the balance being Fe is hot finish rolled into a steel bar with a diameter of 42 mm by a conventional method, and the steel bar immediately after hot finish rolling is The steel bar material of this example was manufactured by passing through a cylindrical water cooling device equipped with a large number of cooling water injection nozzles on the inner diameter side, and continuously water-cooling the surface for 10 seconds. At this time, the rolling finishing temperature of the steel bar material is 900°C, and the surface temperature immediately after water cooling treatment is 420°C.
Met.
一方、比較のため、上記本実施例と同一の中間素材から
同寸法に熱間仕上げ圧延し、従来と同様に、自然空冷さ
せた比較棒鋼素材を製造した。On the other hand, for comparison, a comparative steel bar material was produced by hot finish rolling to the same dimensions from the same intermediate material as in the above-described present example, and naturally air-cooled in the same manner as in the past.
上記本実施例の棒鋼素材と比較棒鋼素材について、それ
ぞれの断面硬度分布を調べた。The cross-sectional hardness distribution of each of the steel bar material of this example and the comparative steel bar material was investigated.
その、調査結果を、第１図に例示する。なお、第１図の
グラフ中の・印のプロットは、本実施例の棒鋼素材の断
面硬度分布値を示し、Ｏ印のプロット、比較棒鋼素材の
断面硬度分布値を示す。The survey results are illustrated in Figure 1. In addition, the plot of * in the graph of FIG. 1 shows the cross-sectional hardness distribution value of the steel bar material of this example, and the plot of O mark shows the cross-sectional hardness distribution value of the comparative steel bar material.
第１図のグラフに示すように、本実施例の棒鋼素材は、
その断面表層部に３〜４ｍｍ程度の硬化層を有し、かつ
、その内部の硬度は比較棒鋼素材とほぼ同等レヘルのも
のであった。As shown in the graph of Fig. 1, the steel bar material of this example was
The cross-sectional surface layer had a hardened layer of about 3 to 4 mm, and the internal hardness was approximately the same as that of the comparative steel bar material.
次いで、上記本実施例の棒鋼素材と比較棒鋼素材につい
て、同一シャー切断装置にて、同一条件の冷間シャー切
断を繰り返して施し、それぞれの冷間シャー切断性を比
較したところ、比較棒鋼素材の切断面には、全て°゛か
えり°゛の発生が認められたが、一方、本実施例の棒鋼
素材の切断面には“かえり゛の発生は認められず、かつ
、その切断面ば、非常に良好な断面状況を呈するもので
あった。また、その切断効率および切断用バイトの損耗
程度も、比較棒鋼素材との対比において、同等ないしは
やや優れた結果が得られ、その表層部に硬化層を有する
本発明の優れた効果を確認することができた。Next, the steel bar material of this example and the comparative steel bar material were repeatedly subjected to cold shear cutting under the same conditions using the same shear cutting device, and the cold shear cutting performance of each was compared. The occurrence of burrs was observed on all the cut surfaces, but on the other hand, no burrs were observed on the cut surfaces of the steel bar material of this example, and the cut surfaces were extremely In addition, the cutting efficiency and degree of wear on the cutting tool were the same or slightly better than the comparison steel bar material, and the hardened layer on the surface layer It was possible to confirm the excellent effects of the present invention.
更に、本実施例おいては、棒鋼の熱間仕上げ圧延直後に
、その表面を急冷するため、得られた棒鋼素材は、表面
スケールが薄く美しい表面肌を呈するという、本発明特
有の付随効果が得られた。Furthermore, in this example, the surface of the steel bar is rapidly cooled immediately after hot finish rolling, so the obtained steel bar material has a thin surface scale and a beautiful surface texture, which is an incidental effect unique to the present invention. Obtained.
上記実施例の結果を踏まえて、冷間鍛造用の素材として
多用される鋼種からなる棒鋼素材を製造した。これら棒
鋼素材の冷却条件および表面硬化状況を第１表に例示す
る。Based on the results of the above examples, a steel bar material made of a steel type frequently used as a material for cold forging was manufactured. Table 1 illustrates the cooling conditions and surface hardening conditions of these steel bar materials.
なお、これら構造用鋼は、ＪＩＳ規格を満足する組成分
を有するもので、それぞれの冷却時間は、その鋼種の焼
入特性と、当該棒鋼素材の直径とにより設定されたもの
である。Note that these structural steels have a composition that satisfies JIS standards, and the respective cooling times are set based on the quenching characteristics of the steel type and the diameter of the steel bar material.
男」≦に
素材を、冷間シャー切断に際して、゛かえり′”の発生
がなく、しかも、容易かつ効率良く切断できるものとし
得る。To make it possible to easily and efficiently cut a material with no ``burrs'' during cold shear cutting, and moreover, a material with a size ≦1.
第１図は本発明に係る棒鋼素材の断面硬度分布を、比較
棒鋼素材の断面硬度分布との対比において示すグラフで
ある。
なお、上表中の時間は秒、温度は℃１硬度はＩＩＶ硬さ
であり、硬化層の厚さは平均値である。
得られた各種の棒鋼素材について、前述と同様に、それ
ぞれの冷間シャー切断性の確認試験を行ったところ、こ
れら棒鋼素材の切断面には、全て“かえり“の発生が認
められず、本発明の優れた効果を追認することができた
。
〔発明の効果〕
以上に述べた如く、本発明に係る棒鋼素材の製造方法に
よれば、製造される棒鋼素材の断面表層部に、所定の硬
化層を形成し得て、得られた棒鋼特許出願人 株式会
社 神戸製鋼所
代 理 人 弁理士 金丸 章−FIG. 1 is a graph showing the cross-sectional hardness distribution of a steel bar material according to the present invention in comparison with the cross-sectional hardness distribution of a comparative steel bar material. In addition, the time in the above table is seconds, the temperature is °C, the hardness is IIV hardness, and the thickness of the cured layer is an average value. The obtained various steel bar materials were tested to confirm their cold shear cutting properties in the same manner as described above, and no burrs were observed on the cut surfaces of these steel bars. We were able to confirm the excellent effects of the invention. [Effects of the Invention] As described above, according to the method for manufacturing a steel bar material according to the present invention, a predetermined hardened layer can be formed in the cross-sectional surface layer of the manufactured steel bar material, and the obtained steel bar patent Applicant Kobe Steel, Ltd. Representative Patent Attorney Akira Kanemaru
Claims (1)
らないように、５秒〜１５秒間の範囲内にて水冷して焼
入れすると共に、内部保有熱にてセルフテンパーさせて
、その断面表層部に硬化層を形成させることを特徴とす
る冷間シャー切断性に優れる棒鋼素材の製造方法。Immediately after hot finish rolling, the surface is water-cooled and quenched within a range of 5 to 15 seconds so that the temperature does not drop below 200°C, and self-tempered using internal heat to form a cross-sectional surface layer. A method for producing a steel bar material with excellent cold shear cutting properties, characterized by forming a hardened layer in the steel bar material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3220189A JPH02209429A (en) | 1989-02-09 | 1989-02-09 | Production of steel bar stock excellent in cold shearing property |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3220189A JPH02209429A (en) | 1989-02-09 | 1989-02-09 | Production of steel bar stock excellent in cold shearing property |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02209429A true JPH02209429A (en) | 1990-08-20 |
Family
ID=12352296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3220189A Pending JPH02209429A (en) | 1989-02-09 | 1989-02-09 | Production of steel bar stock excellent in cold shearing property |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02209429A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024257520A1 (en) * | 2023-06-12 | 2024-12-19 | 山陽特殊製鋼株式会社 | Steel bar and method for producing same |
-
1989
- 1989-02-09 JP JP3220189A patent/JPH02209429A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024257520A1 (en) * | 2023-06-12 | 2024-12-19 | 山陽特殊製鋼株式会社 | Steel bar and method for producing same |
| JP2024177784A (en) * | 2023-06-12 | 2024-12-24 | 山陽特殊製鋼株式会社 | Steel bar and its manufacturing method |
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