JPH11279695A - Steel wire rod for bearing and its production - Google Patents
Steel wire rod for bearing and its productionInfo
- Publication number
- JPH11279695A JPH11279695A JP8213098A JP8213098A JPH11279695A JP H11279695 A JPH11279695 A JP H11279695A JP 8213098 A JP8213098 A JP 8213098A JP 8213098 A JP8213098 A JP 8213098A JP H11279695 A JPH11279695 A JP H11279695A
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- JP
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- Prior art keywords
- less
- wire
- steel
- rolling
- steel wire
- 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.)
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、鋼線材に係り、と
くに軸受の鋼球およびコロに加工して好適な軸受用鋼線
材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel wire rod, and more particularly to a steel wire rod for a bearing which is preferably formed into steel balls and rollers of a bearing.
【0002】[0002]
【従来の技術】従来から、軸受用鋼球、ころは、圧延の
ままの軸受鋼線材を用いて、酸洗−球状化焼鈍−酸洗−
表面処理工程と、さらに伸線加工工程とを経て切断され
たのち、鍛造加工−研摩−焼入れ・焼戻し処理−仕上げ
研摩工程を経て、製造されている。2. Description of the Related Art Conventionally, steel balls and rollers for bearings are pickled, spheroidized annealed, pickled using a rolled bearing steel wire.
After being cut through a surface treatment step and a wire drawing step, it is manufactured through a forging-polishing-hardening / tempering-finish polishing step.
【0003】軸受用鋼球、ころは、寸法精度が高いこと
が要求されるため、その製造工程においてはとくに鍛造
加工に供される線材の寸法精度が厳しく管理されてい
る。そのため、鍛造加工の前に、線径を所定の寸法に精
度良く調整する目的で伸線加工工程が必須であった。伸
線加工は、圧延や酸洗による生じる線径のばらつきある
いは表面粗さのばらつきを修正することを目的として、
通常、線材には減面率:5〜10%の圧延が施されてい
る。[0003] Since steel balls and rollers for bearings are required to have high dimensional accuracy, the dimensional accuracy of wires used for forging in the manufacturing process is strictly controlled. Therefore, prior to forging, a wire drawing process is indispensable for the purpose of accurately adjusting the wire diameter to a predetermined size. The purpose of wire drawing is to correct variations in wire diameter or surface roughness caused by rolling or pickling,
Usually, the wire is rolled at a reduction of area of 5 to 10%.
【0004】しかし、冷間鍛造時の鍛造割れを防止する
ため、伸線時に表面疵の検査を行うことが要求されてい
る。このため、軸受鋼線材では、一般硬鋼線のような高
速伸線が行えず、生産性が低いという問題がある。ま
た、さらに軸受用のため、伸線後の線径公差が厳しく要
求され、伸線ダイスを頻度よく交換する必要がある。こ
のように、伸線加工を行うために工程が複雑となり、製
造コストの増加をもたらしていた。[0004] However, in order to prevent forging cracks during cold forging, it is required to inspect surface flaws during wire drawing. For this reason, there is a problem that high-speed drawing cannot be performed with a bearing steel wire as with a general hard steel wire, and productivity is low. Further, for bearings, the wire diameter tolerance after drawing is strictly required, and it is necessary to frequently replace the drawing dies. As described above, the wire drawing process complicates the process, resulting in an increase in manufacturing cost.
【0005】[0005]
【発明が解決しようとする課題】本発明は、上記した従
来技術の問題を有利に解決し、線材から軸受用鋼球やこ
ろ等を製造する際に伸線加工を必要としない、安価な寸
法精度の優れた、軸受用鋼線材およびその製造方法を提
案することを目的とする。SUMMARY OF THE INVENTION The present invention advantageously solves the above-mentioned problems of the prior art, and does not require wire drawing when producing steel balls or rollers for bearings from wire rods. An object of the present invention is to propose a steel wire rod for a bearing having excellent accuracy and a method for manufacturing the same.
【0006】[0006]
【課題を解決するための手段】本発明者らは、鋼球やこ
ろ等の製造工程において、従来必要としていた伸線加工
を省略するために、伸線加工によらず鍛造加工前の寸法
精度を高めることが必要であるとの考えのもとに鋭意検
討した結果、伸線加工を省略するためには、酸洗後鍛造
加工前の線材の、線径の公差は±0.10mm以内、表面粗さ
はRa 1.0μm 以下とする必要があるという知見を得た。
そのためには、熱間圧延後の線径ばらつき(公差)を一
定値以下に制御し、さらにスケール厚を10μm 以下にす
るのがよいことに想到した。SUMMARY OF THE INVENTION In order to omit the wire drawing conventionally required in the manufacturing process of steel balls, rollers, etc., the present inventors have adopted the dimensional accuracy before forging regardless of the wire drawing. As a result of intensive studies based on the idea that it is necessary to increase the wire drawing, the wire diameter tolerance of the wire rod after pickling and before forging is within ± 0.10 mm and the surface It has been found that the roughness needs to be Ra 1.0 μm or less.
To this end, it has been conceived that it is better to control the wire diameter variation (tolerance) after hot rolling to a certain value or less, and to further reduce the scale thickness to 10 μm or less.
【0007】なお、本発明における線径の公差とは、線
材の同一断面における最大径と最小径を測定し、それら
の目標値に対するばらつき範囲で表示する。また、表面
粗さRaはJIS B 0601に規定されたRaで、触針式表面粗さ
計で、JIS B 0601に規定された方法において、カットオ
フ値を0.8mm として求めたものである。まず、本発明者
らは、酸洗後の表面粗さをRa 1.0μm 以下と小さくする
ために、軸受鋼圧延線材のスケール量に着目した。圧延
後あるいは球状化焼鈍後のスケール量が少ないほど酸洗
の処理時間を短時間とすることができ、その結果、表面
粗さも小さくなると考え、さらに検討した結果、本発明
者らは、酸洗後の表面粗さをRa 1.0μm 以下とするため
には、圧延線材のスケール量は10μm 以下であればよい
こと、さらに、圧延線材のスケール量は、鋼中のS含有
量および線材の熱間圧延後巻取り温度との制御により調
整できること、を見い出した。すなわち、巻取り温度を
〔 950−10000 ×S(重量%)〕以下とすることにより
スケール厚さを10μm 以下とすることができる。[0007] The tolerance of the wire diameter in the present invention is obtained by measuring the maximum diameter and the minimum diameter in the same cross section of the wire and displaying them in a variation range with respect to a target value. The surface roughness Ra is Ra specified in JIS B 0601, and is determined by a stylus type surface roughness meter using a method specified in JIS B 0601 with a cutoff value of 0.8 mm. First, the present inventors focused on the scale amount of a rolled bearing steel wire in order to reduce the surface roughness after pickling to Ra 1.0 μm or less. It is believed that the shorter the amount of scale after rolling or spheroidizing annealing, the shorter the pickling treatment time, and consequently the lower the surface roughness. In order to make the surface roughness after Ra 1.0 μm or less, the scale amount of the rolled wire should be 10 μm or less, and further, the scale amount of the rolled wire should be S content in steel and the hot wire of the wire. It has been found that it can be adjusted by controlling the winding temperature after rolling. That is, the scale thickness can be reduced to 10 μm or less by setting the winding temperature to [950-10000 × S (% by weight)] or less.
【0008】ついで、本発明者らは、線材の線径の公差
は、熱間圧延の加熱温度に大きく影響され、公差を小さ
くするには、加熱温度を高める必要があるとの知見を得
た。本発明は、上記した知見に基づいて、さらに検討し
て構成されたものである。すなわち、本発明は、重量%
で、C:0.5 〜1.2 %、Si:0.8 %以下、Mn:0.2 〜1.
5 %、S:0.010 %以下、Cr:0.5 〜1.6 %を含み、残
部Feおよび不可避的不純物からなる組成を有する鋼線材
であって、酸洗後の表面粗さRaが 1.0μm以下、かつ線
径の公差が±0.10mm以内にあり、伸線加工を省略できる
ことを特徴とする軸受用鋼線材であり、前記組成は、前
記組成に加えてさらに、重量%で、Mo:0.30%以下、C
u:0.50%以下、Ni:0.50%以下のうちから選ばれた1
種または2種以上および/またはREM :0.010 %以下を
含有してもよい。Next, the present inventors have found that the tolerance of the wire diameter of the wire rod is greatly affected by the heating temperature of hot rolling, and it is necessary to increase the heating temperature to reduce the tolerance. . The present invention has been further studied and configured based on the above findings. That is, the present invention provides
C: 0.5-1.2%, Si: 0.8% or less, Mn: 0.2-1.
A steel wire rod containing 5%, S: 0.010% or less, Cr: 0.5 to 1.6% and having a balance of Fe and unavoidable impurities, having a surface roughness Ra after pickling of 1.0 μm or less and a wire. A steel wire rod for bearings having a diameter tolerance within ± 0.10 mm and capable of omitting wire drawing, wherein the composition further includes, in addition to the above composition, Mo: 0.30% or less,
u: 0.50% or less, Ni: 1 selected from 0.50% or less
It may contain one or more species and / or REM: 0.010% or less.
【0009】また、本発明は、重量%で、C:0.5 〜1.
2 %、Si:0.8 %以下、Mn:0.2 〜1.5 %、S:0.010
%以下、Cr:0.5 〜1.6 %を含み、あるいはさらにMo:
0.30%以下、Cu:0.50%以下、Ni:0.50%以下のうちか
ら選ばれた1種または2種以上および/またはREM :0.
010 %以下を含有し、残部Feおよび不可避的不純物から
なる組成を有する鋼素材を、900 〜1050℃に加熱して熱
間圧延を施したのち、750 ℃以上( 950−10000 ×S
(重量%))℃以下の温度で巻取ることを特徴とする軸
受用鋼線材の製造方法であり、本発明においては、前記
熱間圧延における仕上げ圧延を、4ロール圧延機を用い
て行う圧延とするのが好ましい。In the present invention, C: 0.5-1.% By weight.
2%, Si: 0.8% or less, Mn: 0.2 to 1.5%, S: 0.010
% Or less, containing Cr: 0.5 to 1.6%, or further containing Mo:
One or more selected from 0.30% or less, Cu: 0.50% or less, Ni: 0.50% or less and / or REM: 0.
A steel material containing 010% or less and having a composition consisting of the balance of Fe and unavoidable impurities is heated to 900 to 1050 ° C and hot-rolled, and then 750 ° C or more (950-10000 × S
(Wt%)) A method for producing a steel wire rod for a bearing, characterized in that the rolling is performed at a temperature of not more than ° C. In the present invention, the finish rolling in the hot rolling is performed using a four-roll rolling mill. It is preferred that
【0010】[0010]
【発明の実施の形態】まず、鋼線材の組成限定理由につ
いて説明する。 C:0.5 〜1.2 % 軸受の鋼球やころの疲労寿命は、焼入れ−焼戻し後の硬
さに大きく支配されるため、鋼球やころは、所定値以上
の硬さを有することが要求されている。Cは、硬さを増
加させる元素であり、本発明の用途では、所定の硬さを
得るために0.5%以上含有する必要がある。一方、1.2
%を超えると、球状化組織の形成が阻害される。このよ
うなことから、Cは0.5 〜1.2 %の範囲に限定した。な
お、好ましくは 0.7〜 1.1%である。DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the reasons for limiting the composition of a steel wire will be described. C: 0.5 to 1.2% Since the fatigue life of steel balls and rollers of a bearing is largely controlled by the hardness after quenching and tempering, the steel balls and rollers are required to have a hardness of a predetermined value or more. I have. C is an element that increases hardness, and in the application of the present invention, it is necessary to contain 0.5% or more to obtain a predetermined hardness. On the other hand, 1.2
%, The formation of spheroidized tissue is inhibited. For these reasons, C is limited to the range of 0.5 to 1.2%. In addition, it is preferably 0.7 to 1.1%.
【0011】Si:0.8 %以下 Siは、脱酸剤として作用する元素であり、添加が必要で
あるが、0.8 %を超えて添加しても大きな効果が期待で
きないため、Siは0.8 %以下とした。なお、好ましく
は、0.1 〜0.5 %である。 Mn:0.2 〜1.5 % Mnは、脱酸剤として作用しさらに焼入性を向上させる元
素であるが、添加量が0.2 %未満では、これらの効果が
認められない。一方、1.5 %を超えると、球状化組織が
不安定となる。このため、Mnは0.2 〜1.5 %の範囲に限
定した。Si: 0.8% or less Si is an element that acts as a deoxidizing agent and needs to be added. However, if it exceeds 0.8%, a great effect cannot be expected, so that Si is 0.8% or less. did. Incidentally, the content is preferably 0.1 to 0.5%. Mn: 0.2 to 1.5% Mn is an element which acts as a deoxidizing agent and further improves hardenability. However, if the added amount is less than 0.2%, these effects are not observed. On the other hand, if it exceeds 1.5%, the spheroidized structure becomes unstable. For this reason, Mn is limited to the range of 0.2 to 1.5%.
【0012】S:0.010 %以下 Sは、本発明を構成する重要な構成要素の1つである。
前述したように、スケールの生成量を増加させる傾向が
ある。このため、Sは、0.010 %以下に限定した。な
お、好ましくは、0.007 %以下である。 Cr:0.5 〜1.6 % Crは、球状化組織を安定して生成させ、焼入性を向上さ
せる元素であり、本発明では0.5 %以上添加する。しか
し、1.6 %を超えて添加しても効果が飽和するうえ添加
量の増加により経済的に高価となる。このため、Crは0.
5 〜1.6 %の範囲に限定する。S: 0.010% or less S is one of the important constituent elements constituting the present invention.
As described above, there is a tendency to increase the amount of scale generation. Therefore, S is limited to 0.010% or less. Preferably, the content is 0.007% or less. Cr: 0.5 to 1.6% Cr is an element that stably forms a spheroidized structure and improves hardenability. In the present invention, Cr is added in an amount of 0.5% or more. However, even if it is added in excess of 1.6%, the effect is saturated, and the increase in the amount of addition makes it economically expensive. Therefore, Cr is 0.
Limited to the range of 5 to 1.6%.
【0013】Mo:0.30%以下、Cu:0.50%以下、Ni:0.
50%以下のうちから選ばれた1種または2種以上 Mo、Cu、Niはいずれも鋼の焼入れ性を増加させる元素で
あり、必要に応じ添加できる。しかし、Mo、Cu、Niいず
れも多量に添加すると、酸洗性、鍛造性を劣化させる。
このため、Mo:0.30%、Cu:0.50%、Ni:0.50%を上限
とした。Mo: 0.30% or less, Cu: 0.50% or less, Ni: 0.
One or more selected from among 50% or less Mo, Cu, and Ni are all elements that increase the hardenability of steel, and can be added as necessary. However, when Mo, Cu and Ni are added in large amounts, the pickling property and the forgeability deteriorate.
Therefore, the upper limits were set to 0.30% for Mo, 0.50% for Cu, and 0.50% for Ni.
【0014】REM :0.010 %以下 REM は、介在物を球状化し疲労寿命を向上させる作用を
有するため、介在物の形態制御のため必要に応じ添加で
きる。しかし、0.010 %を超える添加は、介在物量を増
加させ、かえって疲労寿命が低下する。 残部Feおよび不可避的不純物 残部はFeと不可避的不純物であるが、とくにPは、転が
り疲労寿命に影響するため0.015 %以下に低減するのが
望ましい。また、Oは、清浄度を低減する意味からも0.
0010%以下とするのが望ましく、さらに疲労寿命の観点
からは0.0007%以下とするのが好ましい。REM: 0.010% or less REM has the effect of spheroidizing inclusions and improving the fatigue life. Therefore, REM can be added as necessary for controlling the form of inclusions. However, if it exceeds 0.010%, the amount of inclusions increases, and on the contrary, the fatigue life decreases. Remaining Fe and unavoidable impurities The remaining is Fe and unavoidable impurities. In particular, P is preferably reduced to 0.015% or less because it affects the rolling fatigue life. In addition, O is 0.
The content is preferably 0010% or less, and more preferably 0.0007% or less from the viewpoint of fatigue life.
【0015】本発明では、上記した鋼組成に加えて、酸
洗後の鋼線材の表面粗さRaを 1.0μm 以下とする。酸洗
後の表面粗さをRa: 1.0μm 以下とすれば、鍛造前に伸
線加工を行わなくてもよくなる。これは、熱間圧延後の
鋼線材表面に形成されるスケールを厚さ10μm 以下とす
ることによって達成される。In the present invention, in addition to the above steel composition, the surface roughness Ra of the steel wire after pickling is set to 1.0 μm or less. If the surface roughness after pickling is set to Ra: 1.0 μm or less, it is not necessary to perform wire drawing before forging. This is achieved by reducing the scale formed on the surface of the steel wire rod after hot rolling to a thickness of 10 μm or less.
【0016】また、本発明の鋼線材では、酸洗後の鋼線
材の線径の公差が目標値に対し±0.10mm以内とする。線
径の公差が±0.10mmを超えると、伸線加工が必要とな
る。軸受用鋼線材は、通常熱間圧延後、球状化焼鈍−酸
洗−表面処理−伸線加工工程を経たのち切断され鍛造加
工を施されるが、本発明の軸受用鋼線材は、前述のよう
に、酸洗後の表面粗さと線径の公差を規定しているの
で、伸線加工を省略でき、安価に製造できる。Further, in the steel wire of the present invention, the tolerance of the wire diameter of the steel wire after pickling is set to within ± 0.10 mm of a target value. If the tolerance of the wire diameter exceeds ± 0.10 mm, wire drawing is required. The steel wire for bearing is usually cut and forged after hot rolling, and then subjected to a spheroidizing annealing-pickling-surface treatment-drawing process. As described above, since the tolerance between the surface roughness and the wire diameter after the pickling is defined, the wire drawing can be omitted, and the manufacturing can be performed at low cost.
【0017】本発明鋼線材の製造条件について説明す
る。上記した組成の溶鋼を、転炉等の公知の溶製方法で
溶製し、造塊−圧延法あるいは連続鋳造法より所定の寸
法の鋼素材とする。本発明では、とくに溶製方法あるい
は鋳造方法を限定する必要はない。鋼素材は、900 〜10
50℃に加熱されたのち熱間圧延を施され、所定の線径の
鋼線材とされる。加熱温度が900 ℃未満では、変形抵抗
が増加し、線径のバラツキが大きくなり、酸洗後の公差
が大きくなる。一方、加熱温度が1050℃を超えると、地
鉄界面が剥離しづらいスケール構造となり、線材表面に
形成されるスケール量が増加し、かつ脱炭深さが大きく
なる。このため、熱間圧延の加熱温度を900〜1050℃の
範囲に限定した。The manufacturing conditions of the steel wire of the present invention will be described. The molten steel having the above-described composition is smelted by a known smelting method such as a converter, and a steel material having a predetermined size is formed by an ingot-rolling method or a continuous casting method. In the present invention, it is not necessary to particularly limit the melting method or the casting method. Steel material is 900 ~ 10
After being heated to 50 ° C., it is subjected to hot rolling to obtain a steel wire having a predetermined wire diameter. If the heating temperature is lower than 900 ° C., the deformation resistance increases, the variation in the wire diameter increases, and the tolerance after pickling increases. On the other hand, when the heating temperature exceeds 1050 ° C., a scale structure in which the ground iron interface is difficult to peel off is obtained, the amount of scale formed on the surface of the wire increases, and the decarburization depth increases. For this reason, the heating temperature of the hot rolling is limited to a range of 900 to 1,050 ° C.
【0018】熱間圧延は、粗圧延と仕上げ圧延とからな
り、粗圧延は通常の方法で良いが、仕上げ圧延は、図1
に示すように2ロール圧延機を複数基配列した圧延機列
で圧下方向をずらして圧延してもよいが、図2に示すよ
うに、特開平5−38502 号公報に記載されているような
4ロール圧延機を複数基配列した圧延機列で圧下方向を
ずらして少なくとも2パス圧延する仕上げ圧延とするの
が線径バラツキをより減少するうえで好ましい。The hot rolling includes rough rolling and finish rolling. The rough rolling may be performed by a usual method.
As shown in FIG. 2, rolling may be performed while shifting the rolling direction in a rolling mill row in which a plurality of two-roll rolling mills are arranged, but as shown in FIG. It is preferable to perform finish rolling in which at least two passes are performed with the rolling direction shifted in a rolling mill row in which a plurality of four-roll rolling mills are arranged in order to further reduce variation in wire diameter.
【0019】また、熱間圧延終了後、線材は巻き取られ
る。巻取り温度は、750 ℃以上( 950−10000 ×S(重
量%))℃以下の温度とする。巻取り温度が750 ℃未満
では、温度制御が不安定になるとともに、巻取りが困難
となる。一方、巻取り温度が( 950−10000 ×S(重量
%))℃を超えると、線材に生成するスケール量が増加
し酸洗性が劣化するため、線材の酸洗後表面粗さが粗く
なり、伸線加工が必要となる。このようなことから、巻
取り温度は750℃以上( 950−10000 ×S(重量%))
℃以下の温度範囲に限定した。After the completion of the hot rolling, the wire is wound up. The winding temperature shall be 750 ° C or more and (950-10000 × S (% by weight)) ° C or less. If the winding temperature is lower than 750 ° C., the temperature control becomes unstable and winding becomes difficult. On the other hand, if the winding temperature exceeds (950-10000 × S (% by weight)) ° C., the scale generated in the wire increases and the pickling property deteriorates, so that the surface roughness of the wire after pickling becomes rough. , Wire drawing is required. For this reason, the winding temperature is 750 ° C or more (950-10000 × S (% by weight)).
It was limited to a temperature range of not more than ° C.
【0020】[0020]
【実施例】表1に示す化学組成を有する鋼を転炉溶製
し、連続鋳造法により400 ×560mmの鋳片とした。これ
ら鋳片を分塊圧延により150mm 角のビレットとした。つ
いで、これらビレットに表2に示す加熱圧延条件で熱間
圧延を施し、鋼線材とした。なお、熱間圧延における仕
上げ圧延は、2ロール圧延機または4ロール圧延機を3
基連続させて圧延した。EXAMPLES Steel having the chemical composition shown in Table 1 was melted in a converter and cast into a slab of 400 × 560 mm by a continuous casting method. These slabs were formed into billets of 150 mm square by slab rolling. Next, these billets were subjected to hot rolling under the heating rolling conditions shown in Table 2 to obtain steel wires. The finish rolling in hot rolling is performed by using a two-roll rolling mill or a four-roll rolling mill for three times.
The base was continuously rolled.
【0021】また、これら圧延鋼線材に、さらに球状化
焼鈍、酸洗処理を施した後の表面粗さ及び線径を測定し
た。なお、球状化焼鈍条件は、790 ℃×8hrの均熱後 6
00℃までを15℃/hの徐冷とした。酸洗は、濃度:15±
3 %の塩酸(液温:35±3 ℃) 中に40min 浸漬すること
により行った。なお、線径の測定方法は、任意の箇所に
ついて同一断面の最大径と最小径を測定し、公差として
目標値(7.50mm)に対するばらつき範囲を算出した。ま
た、表面粗さは、触針式表面粗さ計を用い、2ヶ所でそ
れぞれ10mmの測定長さについて、前述の方法で測定し
た。Further, the surface roughness and the wire diameter of the rolled steel wire rod after further spheroidizing annealing and pickling treatment were measured. The spheroidizing annealing conditions were as follows: after soaking at 790 ° C. for 8 hours.
The temperature was gradually cooled to 00 ° C. at 15 ° C./h. Pickling, concentration: 15 ±
The test was performed by immersing in 3% hydrochloric acid (liquid temperature: 35 ± 3 ° C) for 40 minutes. The wire diameter was measured by measuring the maximum diameter and the minimum diameter of the same cross section at an arbitrary location, and calculating a variation range with respect to a target value (7.50 mm) as a tolerance. The surface roughness was measured by the above-described method using a stylus type surface roughness meter at two locations with a measurement length of 10 mm each.
【0022】それらの結果を表2に示す。Table 2 shows the results.
【0023】[0023]
【表1】 [Table 1]
【0024】[0024]
【表2】 [Table 2]
【0025】本発明例は、酸洗後の線径の公差が目標値
7.50mmに対し±0.10mm以下、さらに表面粗さも小さく、
伸線加工を行わず鍛造加工ができた。これに対し、本発
明の範囲を外れる比較例は、線径の公差が大きいかある
いは表面粗さが大きくなり、鍛造加工前に伸線加工が必
須であった。In the example of the present invention, the tolerance of the wire diameter after pickling is the target value.
± 0.10mm or less compared to 7.50mm, and the surface roughness is small,
Forging was possible without wire drawing. On the other hand, in the comparative examples outside the range of the present invention, the tolerance of the wire diameter was large or the surface roughness was large, and wire drawing was essential before forging.
【0026】[0026]
【発明の効果】本発明によれば、鋼線材から鋼球・ころ
等の軸受を製造するに際し、従来必要とされていた伸線
加工を省略することができ、軸受製造の製造コストを大
幅に削減でき、産業上格段の効果を奏する。According to the present invention, when manufacturing bearings such as steel balls and rollers from steel wire rods, the wire drawing work conventionally required can be omitted, and the manufacturing cost of manufacturing bearings is greatly reduced. It can be reduced and has a remarkable industrial effect.
【図1】2ロール圧延機による圧延方法の1例を模式的
に示す説明図である。FIG. 1 is an explanatory view schematically showing one example of a rolling method using a two-roll rolling mill.
【図2】4ロール圧延機による圧延方法の1例を模式的
に示す説明図である。FIG. 2 is an explanatory view schematically showing one example of a rolling method using a four-roll rolling mill.
Claims (5)
からなる組成を有する鋼線材であって、酸洗後の表面粗
さRaが 1.0μm 以下、かつ線径の公差が±0.10mm以内に
あり、伸線加工を省略できることを特徴とする軸受用鋼
線材。1. The composition contains C: 0.5 to 1.2%, Si: 0.8% or less, Mn: 0.2 to 1.5%, S: 0.010% or less, Cr: 0.5 to 1.6% by weight, the balance being Fe and unavoidable impurities. A steel wire rod having a composition consisting of: having a surface roughness Ra after pickling of 1.0 μm or less, a tolerance of a wire diameter within ± 0.10 mm, and a wire drawing process being omitted. wire.
Mo:0.30%以下、Cu:0.50%以下、Ni:0.50%以下のう
ちから選ばれた1種または2種以上および/またはREM
:0.010 %以下を含有することを特徴とする請求項1
に記載の軸受用鋼線材。2. In addition to the composition, further in weight%
Mo: 0.30% or less, Cu: 0.50% or less, Ni: 0.50% or less selected from one or more and / or REM
: 0.010% or less.
A steel wire rod for a bearing according to the above.
からなる組成を有する鋼素材を、900 〜1050℃に加熱し
て熱間圧延を施したのち、750 ℃以上( 950−10000 ×
S(重量%))℃以下の温度で巻取ることを特徴とする
軸受用鋼線材の製造方法。3. In% by weight, C: 0.5 to 1.2%, Si: 0.8% or less, Mn: 0.2 to 1.5%, S: 0.010% or less, Cr: 0.5 to 1.6%, balance Fe and inevitable impurities After hot-rolling a steel material having a composition consisting of 900 to 1050 ° C and subjecting it to 750 ° C or more (950-10000 ×
(S (% by weight)) A method for producing a steel wire rod for a bearing, wherein the winding is performed at a temperature of not more than (° C) ° C.
ロールミルを用いて行う圧延であることを特徴とする請
求項3に記載の軸受用鋼線材の製造方法。4. The finish rolling in the hot rolling is performed by 4
The method according to claim 3, wherein the rolling is performed using a roll mill.
Mo:0.30%以下、Cu:0.50%以下、Ni:0.50%以下のう
ちから選ばれた1種または2種以上および/またはREM
:0.010 %以下を含有することを特徴とする請求項3
または4に記載の軸受用鋼線材の製造方法。5. In addition to the composition, further in weight percent:
Mo: 0.30% or less, Cu: 0.50% or less, Ni: 0.50% or less selected from one or more and / or REM
: 0.010% or less.
Or the manufacturing method of the steel wire for bearings of 4.
Priority Applications (1)
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JP08213098A JP3796949B2 (en) | 1998-03-27 | 1998-03-27 | Manufacturing method of steel wire rod for bearing |
Applications Claiming Priority (1)
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JP08213098A JP3796949B2 (en) | 1998-03-27 | 1998-03-27 | Manufacturing method of steel wire rod for bearing |
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JPH11279695A true JPH11279695A (en) | 1999-10-12 |
JP3796949B2 JP3796949B2 (en) | 2006-07-12 |
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ID=13765841
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JP08213098A Expired - Fee Related JP3796949B2 (en) | 1998-03-27 | 1998-03-27 | Manufacturing method of steel wire rod for bearing |
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