JPH04119210A - Stainless bolt and nut for controlling torque and its manufacture - Google Patents
Stainless bolt and nut for controlling torque and its manufactureInfo
- Publication number
- JPH04119210A JPH04119210A JP23830890A JP23830890A JPH04119210A JP H04119210 A JPH04119210 A JP H04119210A JP 23830890 A JP23830890 A JP 23830890A JP 23830890 A JP23830890 A JP 23830890A JP H04119210 A JPH04119210 A JP H04119210A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- nuts
- nut
- torque
- bolt
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 229910000765 intermetallic Inorganic materials 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 238000007747 plating Methods 0.000 claims abstract description 9
- 239000004809 Teflon Substances 0.000 claims abstract description 6
- 229920006362 Teflon® Polymers 0.000 claims abstract description 6
- 238000009792 diffusion process Methods 0.000 claims abstract description 6
- 229910017091 Fe-Sn Inorganic materials 0.000 claims abstract 3
- 229910017142 Fe—Sn Inorganic materials 0.000 claims abstract 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 24
- 239000010935 stainless steel Substances 0.000 claims description 24
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims 1
- 229910005391 FeSn2 Inorganic materials 0.000 abstract description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract 2
- 229910052731 fluorine Inorganic materials 0.000 abstract 2
- 239000011737 fluorine Substances 0.000 abstract 2
- 239000011347 resin Substances 0.000 abstract 2
- 229920005989 resin Polymers 0.000 abstract 2
- 239000002253 acid Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Electroplating Methods And Accessories (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野〕
本発明は、締め付け時に必要な一定トルクが要求される
ステンレスボルトφナツトとその作製法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stainless steel bolt φ nut that requires a constant torque during tightening, and a method for manufacturing the same.
［従来の技術］
従来、電気、機械、食品等の産業分野で各種のステンレ
ス製ボルトおよびナツトが数多く使用されてきたが、ト
ルク管理のための一定トルクをもつステンレスボルト・
ナットを得ることは、加工精度上の困難さ、適当な表面
処理法がなかったことなどから、現在まで必要な一定ト
ルクが得られるステンレス製ボルト・ナツトを製造する
ことは不可能であった。[Conventional technology] Conventionally, many types of stainless steel bolts and nuts have been used in the electrical, mechanical, food, and other industrial fields.
Until now, it has been impossible to manufacture stainless steel bolts and nuts that can provide the necessary constant torque due to difficulties in processing precision and the lack of suitable surface treatment methods.
［発明が解決しようとする課題］
上述のように従来のステンレス製ボルト・ナツトを用い
て締付けしようとすると、かじりや焼付けが発生し品い
という問題があり、また、加工精度の問題からステンレ
スボルト・ナットは一定トルクが得られず、トルク管理
は難しいものとされていた。[Problems to be Solved by the Invention] As mentioned above, when attempting to tighten using conventional stainless steel bolts and nuts, there is a problem that galling and seizing occur, resulting in poor quality.・Nuts do not provide constant torque, and torque management was considered difficult.
［課題を解決するための手段］
本発明者らは、斯る課題を解決するために鋭意研究した
ところ、ステンレス製ボルトおよびナツトの一方または
両方の少なくともネジ部表面を特殊加工することにより
一定なトルクで締付けてきるボルト・ナツトが得られる
ことを見い出し、本発明を達成することができた。[Means for Solving the Problems] In order to solve the problems, the present inventors conducted extensive research and found that a certain level of stability can be achieved by specially processing at least the threaded surface of one or both of stainless steel bolts and nuts. It was discovered that bolts and nuts that can be tightened with torque could be obtained, and the present invention was achieved.
すなわち、本発明は一つには、ステンレス製ボルト・ナ
ツトの特にネジ部の表面に、Ｓｎめっきを施し、次いで
熱拡散処理によりＦｅ−３ｎ系金属間化合物を形成せし
め、さらにその上にフッ素樹脂をコーティングすること
によって締め付けトルクが一定に保たれた製品として得
られることを特徴とするトルク管理用ステンレスボルト
・ナットの作製法を提供するものであり、さらには、ス
テンレス製ボルトおよびナツトの一方または両方の少な
くともネジ部の表面に、Ｆｅ−３ｎめっき系金属間化合
物が形成されており、さらにその上にフッ素樹脂がコー
ティングされていることを特徴とするトルク管理用ステ
ンレスボルト・ナットを提供するものである。That is, one aspect of the present invention is to apply Sn plating to the surface of stainless steel bolts and nuts, especially the threaded parts, and then form an Fe-3n intermetallic compound by heat diffusion treatment, and then apply fluororesin on top of the Sn plating. The present invention provides a method for manufacturing stainless steel bolts and nuts for torque management, which is characterized in that the tightening torque is maintained constant by coating the stainless steel bolts and nuts. To provide a stainless steel bolt/nut for torque management, characterized in that an Fe-3n plating intermetallic compound is formed on at least the surface of both threaded parts, and a fluororesin is further coated thereon. It is.
［作 用コ
本発明においてステンレス製ボルトあるいはナツトの表
面にＳｎめっきを施した後、熱拡散処理により金属間化
合物を形成せしめる理由は以下の通りである。[Function] The reason why an intermetallic compound is formed by thermal diffusion treatment after Sn plating is applied to the surface of a stainless steel bolt or nut in the present invention is as follows.
すなわち、金属間化合物は純金属と比べて硬さ、耐磨耗
性、耐食性に優れており、Ｓｎめっき後得られるＦｅ−
３ｎ系金属間化合物はステンレス母材に比較して硬さが
十分高く、且つ組織が緻密で潤滑性良好な被膜のため、
かじり、焼付け防止効果が優れている。従って一定の締
付けトルクが要求されるという特殊事情がない場合は、
この熱拡散処理を行うことのみによって十分満足できる
特性を持つステンレス製ボルト・ナツトを得ることがで
きるものである。In other words, intermetallic compounds have better hardness, wear resistance, and corrosion resistance than pure metals, and the Fe-
3N intermetallic compounds have sufficiently higher hardness than the stainless steel base material, and have a dense structure and a coating with good lubricity.
Excellent galling and seizing prevention effect. Therefore, unless there are special circumstances that require a certain tightening torque,
Only by carrying out this thermal diffusion treatment can stainless steel bolts and nuts with sufficiently satisfactory characteristics be obtained.
しかしながら、この金属間化合物による被膜であってさ
えトルク係数は尚かなり高く、要求にあった低いトルク
値を示すボルト・ナツトを得ることはできなかった。However, even with this intermetallic compound coating, the torque coefficient is still quite high, and it has not been possible to obtain bolts and nuts that exhibit a low torque value that meets the requirements.
そこで本発明においては潤滑性の高いフッ素樹脂をボル
ト・ナツトの一方または両方の少なくともネジ部の表面
にコーティングすることにより、必要な低い一定の締付
けトルクを持つボルト・ナツトが得られることを見い出
すと共に、コーティングするフッ素樹脂の被膜厚みを変
化させることによって任意の所望の低い一定のトルクを
示し、要求にあったトルク管理を行うことができるボル
ト・ナツトを得ることができたものである。Therefore, in the present invention, we have discovered that by coating at least the threaded surface of one or both of the bolts and nuts with a highly lubricating fluororesin, it is possible to obtain bolts and nuts with the necessary low and constant tightening torque. By changing the thickness of the fluororesin coating, it was possible to obtain a bolt/nut that exhibits any desired low constant torque and can perform torque management that meets the requirements.
以下実施例をもって詳細に説明する。A detailed explanation will be given below using examples.
［実施例１］
市販のステンレス製ボルト（材質ＳＵＳＸＭ７、寸法Ｍ
１０Ｘ４０）に所定の前処理を施し、硫酸Ｓｎめっき浴
中で、約５１１１ａ厚みのＳｎを電気めっきした。その
後、熱拡散処理によりＦｅＳｎ２の金属間化合物を形成
させ、最表面にフッ素樹脂としてテフロンのコーティン
グ処理を施した。この場合、フッ素樹脂コーティングは
フッ素樹脂の懸濁分散液中にステンレスボルトを浸漬し
た後、乾燥焼成することにより行った。このようにして
得られたステンレスボルトのうち、フッ素樹脂（テフロ
ン）膜の厚みの最も厚いものを１００とし、その半分の
厚さを５０、さらにその半分を２５とする相対的厚さの
フッ素樹脂膜で表面コーティングされたボルトを供試材
としてそれぞれ用い、ボルト締付け試験を行い締付け回
数とトルク係数の関係を第１図に示した。[Example 1] Commercially available stainless steel bolt (material SUSXM7, dimension M
10×40) was subjected to a predetermined pretreatment and electroplated with Sn to a thickness of about 5111a in a Sn sulfuric acid plating bath. Thereafter, an intermetallic compound of FeSn2 was formed by thermal diffusion treatment, and the outermost surface was coated with Teflon as a fluororesin. In this case, the fluororesin coating was performed by immersing the stainless steel bolt in a fluororesin suspension and dispersion, followed by drying and firing. Among the stainless steel bolts obtained in this way, the relative thickness of the fluororesin (Teflon) film is set at 100, half the thickness at 50, and half at 25. A bolt tightening test was conducted using each bolt whose surface was coated with a film as a test material, and the relationship between the number of tightenings and the torque coefficient is shown in Figure 1.
ボルト締付け試験は、油圧式の軸力計を用い軸力１．Ｏ
ＯＯｋｇ一定とした時の係数を次式により求めた。The bolt tightening test was performed using a hydraulic axial force meter with the axial force 1. O
The coefficient when OOkg was constant was determined by the following formula.
ただし式中の各記号は次のものをそれぞれ表わす。However, each symbol in the formula represents the following.
Ｋ：トルク係数
Ｆ二軸力
ｄ：ねじ呼び径
Ｔ： トルク値
第１図中に、比較例として示すようにフッ素樹脂（テフ
ロン）をコーティングしないものは、締付け回数による
トルク係数の変化は小さく安定しているが、トルク係数
の値は約０．４と高いことがわかる。K: Torque coefficient F Biaxial force d: Nominal screw diameter T: Torque value As shown in Figure 1 as a comparative example, for those not coated with fluororesin (Teflon), the change in torque coefficient due to the number of tightenings is small and stable. However, it can be seen that the value of the torque coefficient is as high as about 0.4.
これに対し本発明によるフッ素樹脂コーティングを施し
たボルトは、全てトルク係数が小さく、且つその厚みを
２５．５０．１００と相対的に変化させることにより０
．１５〜０．３０の範囲で任意の値に設定でき、締付け
回数によるトルク係数の変化も小さく安定したものを得
ることができた。On the other hand, the bolts coated with fluororesin according to the present invention all have a small torque coefficient, and by changing the thickness relative to 25.50.100,
．． It was possible to set it to any value within the range of 15 to 0.30, and it was possible to obtain a stable torque coefficient with little change in the torque coefficient depending on the number of tightening operations.
［実施例２］
ステンレスボルトの代りにステンレスナツトを用いてコ
ーティング処理した以外は、実施例１と同じ実験を行っ
た。コーティング処理したナツトを用い、ボルトは未処
理のものを用いて締付け試験を行った結果、ナツトをま
わして締付ける場合に特に良好な効果が得られることが
わかった。[Example 2] The same experiment as in Example 1 was conducted except that stainless steel nuts were used instead of stainless steel bolts for coating. As a result of conducting a tightening test using a coated nut and an untreated bolt, it was found that a particularly good effect can be obtained when tightening by turning the nut.
［実施例３］
ステンレスボルト・ナットの両方について、それぞれ実
施例１に示した手順に従ってコーティング処理した。締
付け試験はボルト、ナツトのどちらをまわして締付けて
も良好な結果が得られることがわかった。尚、この場合
、ボルト・ナツトは極めて耐食性の良好なものとなるこ
とが理解されよう。[Example 3] Both stainless steel bolts and nuts were coated according to the procedure shown in Example 1. In the tightening test, it was found that good results were obtained whether the bolt or nut was tightened. It will be understood that in this case, the bolts and nuts will have extremely good corrosion resistance.
［発明の効果］
本発明は、上述のようにＳｎめっき後、表面に金属間化
合物を形成させ、さらにテフロンからなるフッ素樹脂物
をコーティングすることによって、従来得られなかった
締付けトルクが一定に管理できるステンレスボルト・ナ
ットを簡易な作製方法で提供できる効果を有するもので
ある。[Effects of the Invention] As described above, after Sn plating, the present invention forms an intermetallic compound on the surface and further coats it with a fluororesin material made of Teflon, thereby making it possible to maintain a constant tightening torque that could not be achieved conventionally. This has the effect of being able to provide stainless steel bolts and nuts that can be manufactured using a simple manufacturing method.
第１図は、本発明によって得られたステンレスボルトの
締付け試験によるトルク係数の変化を示した線図である
。
特□出願人 同和鉱業株式会社
同和ケミカル株式会社FIG. 1 is a diagram showing changes in the torque coefficient of stainless steel bolts obtained according to the present invention in a tightening test. Special Applicant Dowa Mining Co., Ltd. Dowa Chemical Co., Ltd.
Claims (3)
方の少なくともネジ部の表面に、錫めっきを施した後熱
拡散処理によりＦｅ−Ｓｎ系金属間化合物を形成させ、
その上に予め定めた所定のトルク係数を持たせるために
必要な厚さのフッ素樹脂コーティングを行うことを特徴
とするトルク管理用ステンレスボルト・ナットの作製法
。(1) Forming an Fe-Sn-based intermetallic compound on the surface of at least the threaded portion of one or both of the stainless steel bolts and nuts by tin plating and then thermal diffusion treatment,
A method for producing stainless steel bolts and nuts for torque management, which comprises applying a fluororesin coating to a thickness necessary to provide a predetermined torque coefficient thereon.
くともネジ部の表面にＦｅ−Ｓｎ系金属間化合物が形成
されており、その上にフッ素樹脂がコーティングされて
いて、締め付けトルクが予め定めたほぼ一定値を示すよ
うに作製されていることを特徴とするステンレス製ボル
ト・ナット。(2) An Fe-Sn intermetallic compound is formed on the surface of at least the threaded portion of at least one of the bolt and nut, and a fluororesin is coated thereon, and the tightening torque is approximately constant at a predetermined value. Stainless steel bolts and nuts characterized by being manufactured to show the following.
ステンレス製ボルト・ナット。(3) The stainless steel bolt/nut according to claim 2, wherein the fluororesin is Teflon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2238308A JP2844255B2 (en) | 1990-09-07 | 1990-09-07 | Stainless steel bolts and nuts for torque control and their fabrication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2238308A JP2844255B2 (en) | 1990-09-07 | 1990-09-07 | Stainless steel bolts and nuts for torque control and their fabrication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04119210A true JPH04119210A (en) | 1992-04-20 |
| JP2844255B2 JP2844255B2 (en) | 1999-01-06 |
Family
ID=17028277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2238308A Expired - Lifetime JP2844255B2 (en) | 1990-09-07 | 1990-09-07 | Stainless steel bolts and nuts for torque control and their fabrication |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2844255B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015224690A (en) * | 2014-05-27 | 2015-12-14 | 株式会社友電舎 | Manufacturing method of stainless steel-based screw member for piping fastening, and stainless steel-based screw member for piping fastening |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5712108A (en) * | 1980-06-25 | 1982-01-22 | Nippon Pillar Packing | Anticorrosion type insulation bolt set |
| JPS5940008A (en) * | 1982-08-31 | 1984-03-05 | ダイキン工業株式会社 | Clamping tool |
| JPS6445167U (en) * | 1987-09-02 | 1989-03-17 | ||
| JPH02134407A (en) * | 1988-11-11 | 1990-05-23 | Nippon Steel Corp | Stainless steel lubrication working nut and clamping method therewith |
| JPH03162587A (en) * | 1989-11-20 | 1991-07-12 | Tokyo Netsushori Kogyo Kk | Stainless steel bolt and nut |
-
1990
- 1990-09-07 JP JP2238308A patent/JP2844255B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5712108A (en) * | 1980-06-25 | 1982-01-22 | Nippon Pillar Packing | Anticorrosion type insulation bolt set |
| JPS5940008A (en) * | 1982-08-31 | 1984-03-05 | ダイキン工業株式会社 | Clamping tool |
| JPS6445167U (en) * | 1987-09-02 | 1989-03-17 | ||
| JPH02134407A (en) * | 1988-11-11 | 1990-05-23 | Nippon Steel Corp | Stainless steel lubrication working nut and clamping method therewith |
| JPH03162587A (en) * | 1989-11-20 | 1991-07-12 | Tokyo Netsushori Kogyo Kk | Stainless steel bolt and nut |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015224690A (en) * | 2014-05-27 | 2015-12-14 | 株式会社友電舎 | Manufacturing method of stainless steel-based screw member for piping fastening, and stainless steel-based screw member for piping fastening |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2844255B2 (en) | 1999-01-06 |
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