JPH04161835A - Detection of looseness of bolt - Google Patents
Detection of looseness of boltInfo
- Publication number
- JPH04161835A JPH04161835A JP28819090A JP28819090A JPH04161835A JP H04161835 A JPH04161835 A JP H04161835A JP 28819090 A JP28819090 A JP 28819090A JP 28819090 A JP28819090 A JP 28819090A JP H04161835 A JPH04161835 A JP H04161835A
- Authority
- JP
- Japan
- Prior art keywords
- bolt
- looseness
- top surface
- cracks
- brittle paint
- 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
- 238000001514 detection method Methods 0.000 title claims description 4
- 239000003973 paint Substances 0.000 claims abstract description 12
- 239000000020 Nitrocellulose Substances 0.000 abstract description 2
- 229920001220 nitrocellulos Polymers 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 241000270708 Testudinidae Species 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Landscapes
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はボルトゆるみの検出法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a method for detecting bolt loosening.
例えば、第４〜５図に示すような頭部０１及び軸部０２
を有する六角ボルトが締結された場合のゆるみには非回
転ゆるみと回転ゆるみとがあり、いずれの場合もボルト
軸力が低下するので、歪ゲージ、超音波、磁歪現象等を
利用した軸力計でボルト軸力を計測して、ボルトのゆる
みを検出する軸力計測式が知られている。また、トルク
レンチによるトルクチエツク法やテストハンマーによる
音響法も知られている。For example, a head 01 and a shaft 02 as shown in FIGS.
There are two types of loosening when a hexagonal bolt is fastened: non-rotational loosening and rotating loosening. In both cases, the bolt axial force decreases, so an axial force meter using strain gauges, ultrasonic waves, magnetostrictive phenomena, etc. An axial force measurement method is known that measures bolt axial force and detects bolt loosening. Also known are a torque check method using a torque wrench and an acoustic method using a test hammer.
しかしながら、これ等の方法では、下記のような欠点が
ある。However, these methods have the following drawbacks.
（１１軸力計測式では専用の計測器と特殊センサーとを
必要とするので、現場で使用するのには不便である。(The 11-axis force measurement method requires a dedicated measuring instrument and a special sensor, so it is inconvenient to use on site.
（２）トルクチエツク式はボルトの締結状態を変化させ
る慣れがあるので、使用には十分の注意が必要である。(2) Since the torque check type is used to changing the fastening state of bolts, sufficient care must be taken when using it.
（３） 音響式は判断に熟練を必要とするので、−船
釣ではない。(3) Acoustic fishing requires skill in making judgments, so it is not boat fishing.
本発明は、このような事情に鑑みて提案されたもので、
特別な機器を必要とせず、かつ締結状態を変化させるこ
となく、更に熟練を必要とセず１．従って簡便性、状態
保全性及び普遍性に優れたボルトゆるみの検出法を提供
することを目的とする。The present invention was proposed in view of these circumstances, and
No special equipment is required, there is no change in the fastening condition, and there is no need for skill.1. Therefore, it is an object of the present invention to provide a method for detecting bolt loosening that is simple, maintainable, and universal.
そのために、本発明は締結したのちのボルト頂面に塗布
した脆性塗料の亀裂からボルトのゆるみを判定すること
を特徴とする。To this end, the present invention is characterized in that the loosening of the bolt is determined from cracks in the brittle paint applied to the top surface of the bolt after it has been fastened.
（作用〕 上述の構成により、特別なＩｌ器を必要とせず。(effect) With the above configuration, no special Il device is required.
かつ締結状態を変化させることなく、更に熟練を必要と
せず１．従って簡便性、状態保全性及び普遍性に優れた
ボルトゆるみの検出法を得ることができる。And without changing the fastening state and without requiring any skill, 1. Therefore, it is possible to obtain a bolt loosening detection method that is simple, maintainable, and universal.
本発明の一実施例を図面について説明すると、第４〜５
図と同一の符番はそれぞれ同図と同一の部材を示し、ま
ず、第１図側面図において、】は機械要素２に締付けら
れ、軸部０２に引張力３が働き、頂部０１の頂面央部が
皿状に凹んで変形した締結状態のボルト、４は締結状態
のボルト１の頭部頂面に塗布されほとんど伸びがない脆
性塗料で、それは土としてニトロセルローズ樹脂又は松
脂を溶剤で溶かして調製されている。One embodiment of the present invention will be described with reference to the drawings.
The same reference numerals as in the figure indicate the same members as in the same figure. First, in the side view of FIG. The bolt in the fastened state is deformed with a dish-shaped depression in the center. 4 is a brittle paint that is applied to the top surface of the head of bolt 1 in the fastened state and has almost no elongation. It is made by dissolving nitrocellulose resin or pine resin as soil with a solvent. It is prepared using
このような構造において、締結状態のボルト１では軸部
０２に引張力３が作用し、頭部０１の頂面に半径方向の
圧縮ひずみが発生するので、締結状態のポル目がゆるん
で引張力３が減少す、 ると、締結状態のポル）１の頂
面が伸びて平坦状に復元するとともに、第２図工面図及
び第３図部分断面図に示すように、脆性塗料４が一引張
られて亀裂５が発生し、それは複数の同心円状に発達す
る。In such a structure, in the bolt 1 in the fastened state, a tensile force 3 acts on the shaft portion 02, and compressive strain in the radial direction is generated on the top surface of the head 01, so the bolt in the fastened state loosens and the tensile force 3 decreases, the top surface of Pole 1 in the fastened state stretches and restores its flat shape, and as shown in the drawing 2 and the partial sectional view of Fig. 3, the brittle paint 4 is cracks 5 are generated, which develop in a plurality of concentric circles.
その際、例えば呼びがＭＩＯで軸部０２のひずみが１０
００〜１５００Ｘ１０−’のボルトでは、頭部０１のひ
ずみは一３００〜５００ＸＩ０１なので、検出限界が数
百μｍの詭性塗１１４を使用すれば、それの亀ｇ５が目
視又は低倍率の拡大鏡を介して観察でき、従って締結状
態のボルト１の軸力低下すなわちゆるみを亀裂５により
検出することができる。At that time, for example, if the nominal value is MIO and the strain of the shaft part 02 is 10
For a bolt of 00 to 1500X10-', the strain in the head 01 is 1300 to 500XI01, so if you use a scouring coating 114 with a detection limit of several hundred μm, the tortoise g5 of it can be detected visually or with a low-magnification magnifying glass. Therefore, a decrease in the axial force of the fastened bolt 1, that is, loosening, can be detected by the crack 5.
なお、亀裂５の目視を容易にするため、脆性塗料４にア
ルミ微粉末を混合しておいたり、観察時に懐中電灯で脆
性塗料４に斜光線を当ててもよい。In order to facilitate visual inspection of the cracks 5, fine aluminum powder may be mixed into the brittle paint 4, or the brittle paint 4 may be illuminated with oblique light using a flashlight during observation.
このような方法によれば、下記効果が奏せられる。According to such a method, the following effects can be achieved.
（１１特別な計測器やセンサー等を必要としないので、
現場での使用に適し、従って簡便性に優れている。(11 Since no special measuring instruments or sensors are required,
It is suitable for on-site use and is therefore easy to use.
（２）トルクレンチを使用しないので、締結状態のボル
トの締結力を変える慣れがなく、従って締結状態のボル
トの保全性に優れている。(2) Since a torque wrench is not used, there is no need to get used to changing the tightening force of a bolt in a fastened state, and therefore, the maintainability of the bolt in a fastened state is excellent.
（３） 目視による亀裂確認で判定が行えるので、熟
練を必要と廿ず、従って関係者なら誰でも利用すること
ができ、普遍性に優れている。(3) Since the judgment can be made by visual inspection of cracks, no skill is required, and anyone concerned can use it, making it highly universal.
要するに本発明によれば、締結したのちのボルト頂面に
塗布した脆性塗料の亀裂からボルトのゆるみを判定する
ことにより、特別な機器を必要とセす、かつ締結状態を
変化させることなく、更に熟練を必要とせず５．従って
簡便性。In short, according to the present invention, by determining the loosening of a bolt from cracks in the brittle paint applied to the top surface of the bolt after it has been fastened, it is possible to further reduce the need for special equipment and without changing the fastening state. 5. No skill required. Hence the convenience.
状態保全性及び普遍性に優れたボルトゆるみの検出法を
得るから、本発明は産業上極めて有益なものである。The present invention is extremely useful industrially because it provides a method for detecting bolt loosening that has excellent condition integrity and universality.
第１図は本発明の一実施例を示す側面図、第２図は第１
図の脆性塗料の亀裂発生状態を示す正面図、第３図は第
２図の部分拡大縦断面図である。
第４図、第５図はそれぞれ公知の六角ボルトを示す側面
図、正面図である。
１・・・締結状態のボルト。２・・・機械要素、３・・
・引張力、４・・・脆性塗料、５・・・亀裂、０１・・
・頭部、０２・・・軸部、
代理人 弁理士 塚 本 正 文
第１図
第３図
第２図
第４図
θｌ
第５図FIG. 1 is a side view showing one embodiment of the present invention, and FIG. 2 is a side view showing one embodiment of the present invention.
FIG. 3 is a front view showing the state of crack occurrence in the brittle paint shown in FIG. 3, and FIG. 3 is a partially enlarged vertical sectional view of FIG. FIG. 4 and FIG. 5 are a side view and a front view, respectively, showing a known hexagonal bolt. 1... Bolt in a fastened state. 2... Mechanical elements, 3...
・Tensile force, 4...Brittle paint, 5...Crack, 01...
・Head, 02...Shaft, Agent Masashi Tsukamoto, Patent Attorney Figure 1 Figure 3 Figure 2 Figure 4 θl Figure 5
Claims (1)
らボルトのゆるみを判定することを特徴とするボルトゆ
るみの検出法。A bolt loosening detection method characterized by determining the loosening of a bolt from cracks in the brittle paint applied to the top surface of the bolt after it has been fastened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28819090A JPH04161835A (en) | 1990-10-25 | 1990-10-25 | Detection of looseness of bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28819090A JPH04161835A (en) | 1990-10-25 | 1990-10-25 | Detection of looseness of bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04161835A true JPH04161835A (en) | 1992-06-05 |
Family
ID=17726979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28819090A Pending JPH04161835A (en) | 1990-10-25 | 1990-10-25 | Detection of looseness of bolt |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04161835A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004093477A (en) * | 2002-09-03 | 2004-03-25 | Isuzu Motors Ltd | Ultrasonic bolt axial force meter |
| JP2014194403A (en) * | 2013-03-28 | 2014-10-09 | Sakamura Mach Co Ltd | Measurement method of bolt tensile force |
| JP2019073672A (en) * | 2017-10-19 | 2019-05-16 | 東京製綱株式会社 | Fiber reinforced plastic filament with damage detection function |
-
1990
- 1990-10-25 JP JP28819090A patent/JPH04161835A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004093477A (en) * | 2002-09-03 | 2004-03-25 | Isuzu Motors Ltd | Ultrasonic bolt axial force meter |
| JP2014194403A (en) * | 2013-03-28 | 2014-10-09 | Sakamura Mach Co Ltd | Measurement method of bolt tensile force |
| JP2019073672A (en) * | 2017-10-19 | 2019-05-16 | 東京製綱株式会社 | Fiber reinforced plastic filament with damage detection function |
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