DE914571C - Process for avoiding seizure of screw connections that are stressed at higher temperatures - Google Patents
Process for avoiding seizure of screw connections that are stressed at higher temperaturesInfo
- Publication number
- DE914571C DE914571C DEM15374A DEM0015374A DE914571C DE 914571 C DE914571 C DE 914571C DE M15374 A DEM15374 A DE M15374A DE M0015374 A DEM0015374 A DE M0015374A DE 914571 C DE914571 C DE 914571C
- Authority
- DE
- Germany
- Prior art keywords
- higher temperatures
- screw connections
- stressed
- seizure
- nitriding
- 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
Links
- 238000000034 method Methods 0.000 title claims description 3
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 238000005121 nitriding Methods 0.000 description 7
- 206010010904 Convulsion Diseases 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- VEOQUPNIEFSTFA-UHFFFAOYSA-J molybdenum(4+) sulfinato sulfite Chemical compound S(=O)([O-])OS(=O)[O-].[Mo+4].S(=O)([O-])OS(=O)[O-] VEOQUPNIEFSTFA-UHFFFAOYSA-J 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/06—Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure or fretting
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M7/00—Solid or semi-solid compositions essentially based on lubricating components other than mineral lubricating oils or fatty oils and their use as lubricants; Use as lubricants of single solid or semi-solid substances
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/08—Solids
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/10—Semi-solids; greasy
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Lubricants (AREA)
Description
Verfahren zur Vermeidung des Fressens von bei höheren Temperaturen beanspruchten Schraubverbindungen Schraulyverbindungen, die höheren Temperaturen ausgesetzt sind, neigen durch Verzunderung, Erniedrigung der Werkstoffhärte usw. zum Fressen, so daß sich die Schrauben nicht mehr lösen lassen. Um dieses Fressen zu vermieiden, werden verschiedene Mittel angewendet, die zwei Eigenschaften haben müssen,. Erstens sollen sie eine unmittelbare metallische Berührung verhindern und zweitens nach Möglichkeit eine schmierende Wirkung haben,. Bekannt ist z. B. das Nitrieren als Mittel zur Verringerung der Freßgefahr. Das Nitrieren hat jedoch folgende Nachteile: t. Es müssen besondere zum Nitrieren geeignete Stähle verwendet werden, d.iie hohe Werkstoffkosten verursachen; a. die ,metallische Berührung der Gewindeflanken von Bolzen und Mutter wird nicht verhindert, es wird lediglich die Freßneigung durch Veränderung der Oberflächenschicht beim Nitrieren vermindert; 3. das Nitrieren wird bei Temperaturen unter 58o° durchgeführt; bei Teilen, die höhere Temperaturen auszuhalten haben, würde sich die Nitrierschicht in ungünstigef Weise umwandeln, bzw. es würde der Stickstoff in das Innere des Werkstoffes weiterdiffundieren, so, daß die Nitrierwirkung verlorengeht..Method of avoiding seizure at higher temperatures screw connections stressed screw connections, the higher temperatures are exposed to, tend due to scaling, lowering of the material hardness, etc. to eat, so that the screws can no longer be loosened. About this eating To avoid it, various means are used which have two properties have to,. First, they should prevent direct metallic contact and secondly, if possible, have a lubricating effect. Is known z. B. that Nitriding as a means of reducing the risk of seizure. However, nitriding has the following Cons: t. Special steels suitable for nitriding must be used, d. they cause high material costs; a. the metallic contact of the thread flanks bolts and nuts are not prevented, only the tendency to seize is prevented Change in the surface layer during nitriding reduced; 3. the nitriding is carried out at temperatures below 58o °; for parts that can withstand higher temperatures the nitrided layer would change in an unfavorable way, or it would the nitrogen diffuses further into the interior of the material, so that the nitriding effect get lost..
Das Nitrieren verhindert also weder die metallische Berührung, noch ergibt es eine schmierende Wirkung. Dias Einbringen eines Schmiermittels zwischen die Gewindeflanken ist an sich 'bekannt. Die Geeignetheit des Mittels äst abhängig von seiner Struktur. Das bekannte Graphit hat, mit Öl gemischt, bereits eine Struktur, die den vorgenannten Forderungen ganz gut entspricht. Weiter sind einige Salze, die ähnliche Eigenschaften haben, z. B. Molybdändisulfit, bekannt, die ebenfalls verwendet werden.Nitriding doesn’t prevent metallic contact, either it gives a lubricating effect. Slides the introduction of a lubricant between the thread flanks is known per se '. The suitability of the remedy aest depending on its structure. The well-known graphite, mixed with oil, already has a structure that meets the aforementioned requirements quite well. Are further some salts that have similar properties e.g. B. Molybdenum disulfite, known which are also used.
Es hat sich nun gezeigt, duß bei einem Bestreichen der Gewinde vor der Verbindung mit einer Aufschwemmung von Bleiglätte gemäß der Erfindung besonders gute Ergebnisse erzielt werden. Bleiglätte besitzt eine Struktur, die sehr gute Schmiereigenschaften hat. Durch dieses Mittel wird jegliches Fressen im Gewinde auch nach lang andauernder Beanspruchung bei hohen Temperaturen sicher verhindert. Die Bleiglätte hat sich nicht nur bei den üblichen warmfesten Stählen bewährt, sondern auch bei hoch dauerstandfesten hitzebeständigen austenitischen Stählen, die wegen ihrer Weichheit eine besondere Freßneägung haben. Als Aufschwgmmittel für die Bleiglätte kann ein beliebiges hierzu geeignetes Mittel verwendet werden. Eine Aufschwemmung in Wasser hat sich als sehr vorteilhaft erwiesen,.It has now been shown that the thread must first be coated the connection with a flooding of black lead according to the invention in particular good results can be achieved. Metallic lead has a structure that is very good Has lubricating properties. This means that any seizure in the thread is eliminated reliably prevented even after prolonged exposure to high temperatures. The litharge has not only proven itself with the usual creep-resistant steels, but even in the case of high-strength, heat-resistant austenitic steels, which are due to their softness have a special eating tendency. As a buoyancy aid for the black lead any suitable means can be used. A suspension in water has been found to be very beneficial.
Mittels der Bleiglätte können außerdem die Hohlräume zwischen Bolzengewinde und Mutter ausgefüllt werden, so daß korrodierende oder oxydierende Medien nicht .eindringen können..By means of the black lead, the cavities between the bolt threads can also be opened and nut are filled out so that corrosive or oxidizing media do not .can penetrate ..
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEM15374A DE914571C (en) | 1952-09-05 | 1952-09-05 | Process for avoiding seizure of screw connections that are stressed at higher temperatures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEM15374A DE914571C (en) | 1952-09-05 | 1952-09-05 | Process for avoiding seizure of screw connections that are stressed at higher temperatures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE914571C true DE914571C (en) | 1954-07-05 |
Family
ID=7296853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEM15374A Expired DE914571C (en) | 1952-09-05 | 1952-09-05 | Process for avoiding seizure of screw connections that are stressed at higher temperatures |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE914571C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3432001C1 (en) * | 1984-08-31 | 1985-10-17 | Daimler-Benz Ag, 7000 Stuttgart | Screw having defined coefficients of friction |
-
1952
- 1952-09-05 DE DEM15374A patent/DE914571C/en not_active Expired
Non-Patent Citations (1)
| Title |
|---|
| None * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3432001C1 (en) * | 1984-08-31 | 1985-10-17 | Daimler-Benz Ag, 7000 Stuttgart | Screw having defined coefficients of friction |
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