JP3503724B2 - Manufacturing method of cold drawn wire rod for bearing - Google Patents
Manufacturing method of cold drawn wire rod for bearingInfo
- Publication number
- JP3503724B2 JP3503724B2 JP16347496A JP16347496A JP3503724B2 JP 3503724 B2 JP3503724 B2 JP 3503724B2 JP 16347496 A JP16347496 A JP 16347496A JP 16347496 A JP16347496 A JP 16347496A JP 3503724 B2 JP3503724 B2 JP 3503724B2
- Authority
- JP
- Japan
- Prior art keywords
- wire
- cold
- finish
- drawn wire
- bearing
- 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
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Forging (AREA)
- Metal Extraction Processes (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、軸受要素であるボ
ール・ローラーなどの転動体の素材として使用される軸
受用冷間引抜き加工線材を製造するに最適な軸受用冷間
引抜き加工線材の製造方法に関するものである。
【０００２】
【従来の技術】従来、軸受要素であるボール・ローラー
などの転動体の素材として使用される軸受用冷間引抜き
加工線材については、最終製品の寸法精度の保証と冷間
加工性が要求され、冷間鍛造やヘッダー加工等の冷間加
工時に必要な表面精度と被膜潤滑の確保をする必要があ
る。そのため、従来においては、軸受用冷間引抜き加工
線材を製造するに際して、次のような工程により軸受用
冷間引抜き加工線材を得るようにしているのが実状であ
る。
【０００３】すなわち、従来工程においては、圧延した
後球状化焼鈍、その後酸洗し、中間伸線、焼鈍、再度酸
洗・被膜、仕上げ伸線・渦流探傷の順序で行うか、また
は圧延した後球状化焼鈍、その後酸洗し、中間伸線・渦
流探傷、焼鈍、再度酸洗・被膜、仕上げ伸線、または圧
延した後球状化焼鈍、その後酸洗・被膜、仕上げ伸線・
渦流探傷（特開平８−１０８２５号公報）による方法等
が知られている。
【０００４】
【発明が解決しようとする課題】しかしながら、このよ
うな従来の軸受用冷間引抜き加工線材の製造工程では、
仕上げ伸線・渦流探傷後に疵等の不適合が発見された場
合に疵取りとその後の処理は不可能であり、不良品屑処
分となっていた。このような不良品の増大・製造コスト
の上昇という問題点を有することから、このような軸受
用冷間引抜き加工線材を製造するに際しての不良品・製
造コストの削減が望まれている。
【０００５】
【課題を解決するための手段】本発明に係る軸受用冷間
引抜き加工線材の製造方法は、冷間引抜き加工伸線機の
仕上げ伸線用ダイスと渦流探傷機の後に、さらに仕上げ
伸線用ダイスを配列した設備において、前仕上げ伸線と
後仕上げ伸線の減面率を変えて、軸受用冷間引抜き加工
線材を得ることを特徴とする軸受用冷間引削加工線材の
製造方法にある。同じく、本発明に係る軸受用冷間引抜
き加工線材の製造方法の実施態様において、渦流探傷試
験の結果、表面疵が発見された場合、疵検出とともに伸
線機が停止し、表面疵を確認することが出来、また、疵
手入れの処置を可能とすることができるようにしている
ことにある。
【０００６】次いで、疵手入れの後には速乾性の潤滑被
膜を塗布し、後仕上げ伸線することで疵取り前の被膜状
態に比べて品質が低下することなく、軸受用冷間引抜き
加工線材を得ることができる。ここで、速乾性の潤滑被
膜を塗布し、後仕上げ伸線するのは、軸受用冷間引抜き
加工線材が後の冷間引抜き時に焼付きを起こす恐れがあ
るためである。同時に、疵取り跡の肉盛修正がなされて
疵取り深さの軽減が見込まれ、表面疵の保証された軸受
用冷間引抜き加工線材を得ることができるようにしてい
る。
【０００７】 以下、本発明について図面に従って詳細
に説明する。図１は本発明に係る伸線工程の設備を示す
説明図である。すなわち、本発明に係る軸受用冷間引抜
き加工線材の製造方法の一実施態様における仕上げ伸線
用ダイスと渦流探傷機との位置関係を示している。この
図１に示すように、この仕上げ伸線・渦流探傷工程にお
いて、被膜線材１に対する前仕上げ伸線用ダイス２によ
る仕上げ伸線は、減面率の範囲を２〜２０％とするこ
と、および後仕上げ伸線用ダイス４による仕上げ伸線
は、１〜１０％の減面率範囲に設定するのが良い。この
場合、後仕上げ伸線用ダイス４による仕上げ伸線の減面
率が１％未満であると渦流探傷試験の精度が低下するの
で好ましくない。また、前仕上げ伸線と後仕上げ伸線の
減面率の配分は、８０〜５５：２０〜４５となるように
設定するのが好ましい。
【０００８】この伸線機で図１に示す渦流探傷の探触子
３は、前仕上げ伸線用ダイス２の近傍に設けるものとす
る。後仕上げ伸線用ダイス４との間は、疵検知により伸
線機が停止でき、尚かつ、疵取り処置が出来る距離を設
ける必要がある。このようにして、冷間加工に必要な潤
滑被膜を確保し、表面疵の保証された軸受用冷間引抜き
加工線材を得ることが出来、軸受用ボールやローラーの
素材としてヘッダー加工等の冷間加工工程に供給され
る。
【０００９】本発明に係る軸受用冷間引抜き加工線材の
製造方法では、冷間引抜き加工伸線機の仕上げ伸線用ダ
イスと渦流探傷機の後に、さらに仕上げ伸線用ダイスを
配列した設備において、前仕上げ伸線と後仕上げ伸線の
減面率を変えて、軸受用冷間引抜き加工線材を得ること
としたから、最終渦流探傷試験の後に疵取り処置を実施
したときでも、従来の工程で製造した軸受用冷間引抜き
加工線材に比べて品質が劣ることのない良好なる軸受用
冷間引抜き加工線材が製造される。このため、不良品の
削減と製造コストの削減が疵取り処理により図られる。
【００１０】 そして、疵手入れの跡には速乾性の潤滑
被膜を塗布した後仕上げ伸線すること、並びに、前後の
仕上げ伸線の減面率の設定と、前仕上げ伸線と後仕上げ
伸線の減面率の配分を、８０〜５５：２０〜４５となる
ように設定しているので、潤滑の良い、線材の振れもな
く渦流探傷機で精度保証がなされた軸受用冷間引抜き加
工線材を得られることになる。また同時に、後仕上げ伸
線をすることで疵取り跡の肉盛修正がなされ、疵取り深
さの軽減が見込まれ、表面疵の保証された軸受用冷間引
抜き加工線材を得られる。
【００１１】
【実施例】図１に示すような伸線用ダイスと渦流探傷機
を配列した設備において、高炭素クロム軸受鋼および軸
受用合金鋼からなる直径１０ｍｍおよび８ｍｍの線材
を、各種の減面率の配分で伸線を行い、次いで伸線機を
停止した後、疵取りの実施と被膜潤滑の塗布を行った。
その結果、表１に示す結果が得られた。同じく、疵取り
跡に被膜潤滑を塗布しない比較例の結果も表１に併記し
た。このようにして得られた軸受用冷間引抜き加工線材
の表面は、潤滑の良い冷間加工にも耐えるものとなっ
た。一方、比較例の場合には表面焼付きが発生し、冷間
加工用線材としては保証できないものも見られた。
【００１２】
【表１】【００１３】次に、先に示した実施例のもとで、疵取り
の水準を変え引抜き代との組合せで仕上げ伸線を行っ
た。そして、仕上げ伸線前後の疵取り跡を測定したとこ
ろ、図２のように、疵取り跡軽減度合いの結果が得られ
た。こうして得られた結果で疵取りを実施し、軸受用冷
間引抜き加工線材の製造を行い確認したところ、表面疵
を保証し得るものとなっていた。
【００１４】
【発明の効果】以上述べたように、本発明に係る軸受用
冷間引抜き加工線材の製造方法では、冷間引抜き加工伸
線機の仕上げ伸線用ダイスと渦流探傷機の後に、さらに
仕上げ伸線用ダイスを配列した設備において、前仕上げ
伸線と後仕上げ伸線の減面率を変えて、軸受用冷間引抜
き加工線材を得ることとしたから、軸受要素であるボー
ル・ローラー等の素材として使用される軸受用冷間引抜
き加工線材の製造に際して、最終渦流探傷試験の後に疵
取り処置を実施したときでも、従来の工程で製造した軸
受用冷間引抜き加工線材に比べて品質が劣ることのない
良好なる軸受用冷間引抜き加工線材が製造される。従っ
て、最終渦流探傷試験の後に疵取り処置が可能となっ
て、不良品の削減と製造コストの削減が実現されるとい
う極めて優れた効果をもたらされる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for manufacturing a cold-drawn wire rod for a bearing used as a material for a rolling element such as a ball roller as a bearing element. The present invention relates to a method for producing a cold drawn wire for bearings. 2. Description of the Related Art Conventionally, a cold drawn wire for a bearing used as a material for a rolling element such as a ball roller, which is a bearing element, is required to guarantee the dimensional accuracy of the final product and to maintain the cold workability. It is required to ensure surface accuracy and film lubrication required for cold working such as cold forging and header working. Therefore, in the related art, when manufacturing a cold-drawn wire for a bearing, it is a reality that a cold-drawn wire for a bearing is obtained by the following steps. [0003] That is, in the conventional process, after rolling, spheroidizing annealing, then pickling, intermediate drawing, annealing, pickling and coating again, finish drawing and eddy current flaw detection, or after rolling. Spheroidizing annealing, then pickling, intermediate drawing / eddy current flaw detection, annealing, pickling / coating, finish drawing, or rolling and rolling and then spheroidizing, then pickling / coating, finish drawing /
A method based on eddy current flaw detection (Japanese Patent Application Laid-Open No. 8-10825) is known. [0004] However, in such a conventional manufacturing process of a cold-drawn wire rod for a bearing,
If an incompatibility such as a flaw was found after finishing wire drawing and eddy current flaw detection, flaw removal and subsequent processing were impossible, resulting in disposal of defective waste. Since there is a problem of such an increase in defective products and an increase in manufacturing cost, it is desired to reduce defective products and manufacturing costs when manufacturing such cold-drawn wire rods for bearings. [0005] According to the present invention, a method of manufacturing a cold-drawn wire for a bearing according to the present invention is further performed after a finish drawing die and an eddy current flaw detector of a cold-drawn wire drawing machine. In a facility in which dies for wire drawing are arranged, by changing the area reduction rate of pre-finish wire drawing and post-finishing wire drawing, a cold drawing wire material for bearings characterized by obtaining a cold drawn wire material for bearings. In the manufacturing method. Similarly, in the embodiment of the method for manufacturing a cold-drawn wire for bearings according to the present invention, if a surface flaw is found as a result of the eddy current flaw detection test, the wire drawing machine is stopped together with the flaw detection, and the surface flaw is confirmed. And it is possible to make it possible to take care of flaws. [0006] Then, after repairing the flaws, a quick-drying lubricating coating is applied and post-finish drawing is performed, so that the quality of the cold-drawn wire rod for bearings can be reduced without lowering the quality as compared with the coating state before the flaw removal. Obtainable. Here, the reason why the quick-drying lubricating film is applied and the post-finish drawing is performed is that there is a fear that the cold-drawn wire for bearing may be seized at the time of subsequent cold drawing. At the same time, the overlay of the flaw removal marks is corrected, and the flaw removal depth is expected to be reduced, so that a cold drawn wire rod for bearings whose surface flaws are guaranteed can be obtained. Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing equipment for a wire drawing step according to the present invention. That is, the positional relationship between the dies for finish drawing and the eddy current flaw detector in one embodiment of the method of manufacturing the cold drawn wire rod for a bearing according to the present invention is shown. As shown in FIG. 1, in the finish wire drawing / eddy current flaw detection step, the finish wire drawing by the pre-finishing wire die 2 for the coated wire 1 has a reduction area of 2 to 20%, and Finish wire drawing by the post-finish wire drawing die 4 is preferably set in a range of 1 to 10% in area reduction. In this case, it is not preferable that the reduction rate of the finish wire drawing by the post-finishing wire drawing die 4 is less than 1%, because the accuracy of the eddy current flaw detection test decreases. Further, it is preferable to set the distribution of the area reduction rate of the pre-finishing wire drawing and the post-finishing wire drawing to be 80 to 55:20 to 45. In this wire drawing machine, a probe 3 for eddy current flaw detection shown in FIG. 1 is provided in the vicinity of a pre-finishing wire drawing die 2. It is necessary to provide a distance between the die for finishing wire drawing 4 and the wire drawing machine which can be stopped by flaw detection and at which flaw removal treatment can be performed. In this way, a lubricating film necessary for cold working can be secured, and a cold drawn wire rod for bearings with guaranteed surface flaws can be obtained. Supplied to the processing step. In the method for producing a cold-drawn wire rod for a bearing according to the present invention, in a facility in which a finish-drawing die is arranged after a finish-drawing die and an eddy current flaw detector of a cold-drawing wire drawing machine. In order to obtain cold-drawn wire for bearings by changing the area reduction rate of pre-finished wire drawing and post-finish wire drawing, even if flaw removal treatment is performed after the final eddy current flaw detection test, the conventional process A good cold-drawn wire for bearings is produced that is not inferior in quality to the cold-drawn wire for bearings manufactured in the above. For this reason, the reduction of defective products and the reduction of manufacturing cost are achieved by the flaw removal processing. [0010] Then, after applying a quick-drying lubricating film to the traces of flaw care, finish drawing is performed, setting of a reduction in front and rear finish drawing, pre-finishing drawing and post-finishing drawing are performed. Is set so as to be 80-55: 20-45, so that the cold-drawn wire for bearings is lubricated, has no deflection of the wire, and is assured of accuracy by the eddy current flaw detector. Will be obtained. At the same time, the post-finish wire drawing makes it possible to correct the build-up of the flaw removal mark, reduce the flaw removal depth, and obtain a cold drawn wire rod for bearings with guaranteed surface flaws. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a facility in which a wire drawing die and an eddy current flaw detector are arranged as shown in FIG. 1, wires of 10 mm and 8 mm in diameter made of high carbon chromium bearing steel and alloy steel for bearings are reduced in various ways. The wire drawing was performed with the distribution of the surface area, and then after the wire drawing machine was stopped, the flaw removal and the coating lubrication were performed.
As a result, the results shown in Table 1 were obtained. Similarly, Table 1 also shows the results of Comparative Examples in which no film lubrication was applied to the scratch marks. The surface of the cold drawn wire rod for a bearing obtained in this manner was able to withstand cold lubrication with good lubrication. On the other hand, in the case of the comparative example, surface seizure occurred, and some of them could not be guaranteed as a wire for cold working. [Table 1] Next, based on the above-described embodiment, finish drawing was performed by changing the level of flaw removal and combining with the drawing allowance. Then, when the scratch marks before and after the finish wire drawing were measured, the result of the degree of the scratch mark reduction degree was obtained as shown in FIG. Flaw removal was performed using the results obtained in this way, and cold drawn wire rods for bearings were manufactured and confirmed. As a result, surface flaws could be guaranteed. As described above, in the method for producing a cold drawn wire for a bearing according to the present invention, after the finish drawing die of the cold drawn wire drawing machine and the eddy current flaw detector, Furthermore, in the equipment where finish drawing dies are arranged, the reduction ratio of the pre-finish drawing and the post-finishing drawing is changed to obtain the cold drawn wire for bearings. In the production of cold-drawn wire for bearings used as a material, etc., even when flaw removal treatment is performed after the final eddy current inspection test, the quality is lower than that of cold-drawn wire for bearings manufactured in the conventional process. A cold drawn wire rod for a bearing, which is not inferior in quality, is manufactured. Therefore, it is possible to perform a flaw removal treatment after the final eddy current flaw detection test, which brings about an extremely excellent effect of reducing defective products and reducing manufacturing costs.
【図面の簡単な説明】
【図１】本発明に係る伸線工程の設備を示す説明図であ
る。
【図２】本発明に係る仕上げ伸線用ダイスでの疵取り跡
軽減度合の結果を示す図である。
【符号の説明】
１ 被膜線材
２ 前仕上げ伸線用ダイス
３ 渦流探傷の探触子
４ 後仕上げ伸線用ダイスBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing equipment for a wire drawing step according to the present invention. FIG. 2 is a view showing a result of a degree of flaw removal trace reduction degree in a finish wire drawing die according to the present invention. [Description of Signs] 1 Coated wire rod 2 Pre-finish drawing die 3 Probe for eddy current flaw detection 4 Post-finishing drawing die
フロントページの続き (56)参考文献 特開 平８−10825（ＪＰ，Ａ) 特開 平８−10826（ＪＰ，Ａ) 特開 平８−132127（ＪＰ，Ａ) 特開 昭60−152317（ＪＰ，Ａ) 特開 平４−238621（ＪＰ，Ａ)Continuation of front page (56) References JP-A-8-10825 (JP, A) JP-A-8-10826 (JP, A) JP-A-8-132127 (JP, A) JP-A-60-152317 (JP, A) JP-A-4-238621 (JP, A)
Claims (1)
イスと渦流探傷機の後に、さらに仕上げ伸線用ダイスを
配列した設備において、前仕上げ伸線と後仕上げ伸線の
減面率の配分を８０〜５５：２０〜４５と変えて、軸受
用冷間引抜き線材を得るにあたり、渦流探傷機で疵を検
出した場合には、渦流探傷機後で仕上げ伸線用ダイス前
の位置で疵取り処理を施して仕上げ伸線用ダイスで仕上
げ伸線することを特徴とする軸受用冷間引抜き加工線材
の製造方法。(57) [Claims] [Claim 1] In a facility in which a finishing wire die is further arranged after a finishing wire die and an eddy current flaw detector of a cold drawing wire drawing machine, a pre-finish wire drawing is performed. the distribution of the reduction of area of the rear finish drawing a 80 to 55: 20 to 45 and to change, bearing
Flaws are detected with an eddy current flaw detector to obtain cold drawn wire rods
If it comes out, after the eddy current flaw detector and before the finishing wire drawing die
At the position shown in the above and finish with a finish wire drawing die
Method for producing a cold drawing wire rod bearing, wherein the lower wire drawing to Rukoto.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16347496A JP3503724B2 (en) | 1996-06-24 | 1996-06-24 | Manufacturing method of cold drawn wire rod for bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16347496A JP3503724B2 (en) | 1996-06-24 | 1996-06-24 | Manufacturing method of cold drawn wire rod for bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH105848A JPH105848A (en) | 1998-01-13 |
| JP3503724B2 true JP3503724B2 (en) | 2004-03-08 |
Family
ID=15774568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16347496A Expired - Lifetime JP3503724B2 (en) | 1996-06-24 | 1996-06-24 | Manufacturing method of cold drawn wire rod for bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3503724B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104668310A (en) * | 2015-03-10 | 2015-06-03 | 镇江耐丝新型材料有限公司 | Online monitoring device for bamboo joint phenomenon in steel wire drawing |
| JP6345835B1 (en) * | 2017-04-18 | 2018-06-20 | 株式会社天辻鋼球製作所 | Manufacturing equipment and manufacturing method of spherical body |
| EP3678143B1 (en) * | 2018-10-01 | 2023-08-16 | Sumitomo Electric Toyama Co., Ltd. | Method and device for manufacturing plated wire |
-
1996
- 1996-06-24 JP JP16347496A patent/JP3503724B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH105848A (en) | 1998-01-13 |
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