1、ASD STANDARD NORME ASD ASD NORM prEN 6117 Edition P 1 December 2006 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONGulledelle 94 - B-1200 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 763 3565 - www.asd-stan.orgICS: Descriptors: ENGLISH VERSION Aerospace ser
2、ies Specification for lubrication of fasteners with cetyl alcohol Srie arospatiale Spcification pour la lubrification de la visserie lalcool ctylique Luft- und Raumfahrt Spezifikation fr Schmierung von Verbindungselementen mit Cetylalkol This “Aerospace Series“ Prestandard has been drawn up under th
3、e responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publicat
4、ion of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft Europea
5、n Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards c
6、onflicting with the EN. Edition approved for publication 31 December 2006 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain Copyright 2006 by ASD-STAN prEN 6117:20062 Contents Page Foreword2 1 Scope 3 2 Products .3 3 Description of processes4 4 Qua
7、lity assurance requirements5 5 Mixture life5 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Mechanical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received
8、approval for Publication. prEN 6117:2006 3 1 Scope This specification defines the process applicable to the lubrication of threaded bolts, nuts, lock bolt pins and collars with cetyl alcohol. It defines the product application methods and the relevant quality assurance requirements for the lubricati
9、on of the commonly used fastener materials: Aluminium alloys, alloy steels, stainless steels, titanium alloys and nickel base alloys. 2 Products 2.1 Cetyl alcohol Cetyl alcohol shall be per generic formula )(1523OHCHCH , in the form of white flake or granule, providing the characteristics shown in T
10、able 1. Table 1 Characteristics of cetyl alcohol Property Requirement C16 carbon content, % 95 min Hydroxyl value 218 mg KOH/g 238 mg KOH/g Acid value, max 2,0 mg KOH/g Saponification value, max 3,0 mg KOH/g Iodine value, max 3,0 I2g/100 g Melting point 46 C 53 C Boiling point (vapour pressure: 15 m
11、m of mercury) 179 C 189 C Boiling point (vapour pressure: 760 mm of mercury) 350 C 355 C Flash point, min 110 C Density at 20 C (0,818 0,002) g/cm3Density at 60 C (0,816 0,002) g/cm32.2 Solvents The solvent to be used is white spirit (95 % Naphtha). NOTE 1 Alternative lubricant formulations may be u
12、sed providing that they have been approved and documented with the relevant standard part qualification body. Such an alternative is not subject to the concentration levels defined in 3.1.2. NOTE 2 For titanium alloy parts, the use of chlorinated solvents and products is strictly prohibited (risk of
13、 embrittlement). prEN 6117:20064 3 Description of processes 3.1 Preparation of solution 3.1.1 Preparation of solvent base solution for bolts, pins and swage collars Prepare a solution containing 120 grams to 150 grams of cetyl alcohol per litre of solvent (see 2.2). To correctly dissolve the cetyl a
14、lcohol, the solution must be heated to a temperature of (49 3) C. CAUTION This mixture has a relatively low flash point, only use with equipment designed for handling flammable and volatile fluids. 3.1.2 Preparation of solvent base solution for internally threaded parts The cetyl alcohol content wil
15、l range from 30 grams to 165 grams cetyl alcohol per litre of solvent (see 2.2). Solution content is adjusted inside the above limit to fulfill the preload requirement as per applicable products specification. To correctly dissolve the cetyl alcohol, the solution must be heated to a temperature of (
16、49 3) C. CAUTION This mixture has a relatively low flash point, only use with equipment designed for handling flammable and volatile fluids. 3.2 Cleaning The parts to be lubricated must be clean and dry. The cleaning method shall be such as to ensure the surface of the part is free from oil, grease,
17、 rust, scale and other foreign materials. The cleaning method shall have no harmful effect on material or surface finish properties. 3.3 Application of cetyl alcohol Cleaned products are to be placed into racks or baskets. Racks or baskets used during lubrication of parts shall be made of non-contam
18、inating materials and designed such as to ensure complete lubrication and drainage. Product shall be immersed into a cetyl alcohol solution of solvent base until all parts reach the solution temperature. 3.4 Drain The rack or basket of products shall be removed from solution and allowed to drain off
19、 excess of lubricant. As far as possible, slow tumbling or shaking is recommended to prevent coating buildup on the surface. Draining time is dependent on size and quantity of parts being lubricated. Draining time shall be not less than one minute. 3.5 Drying Products shall be dried at room temperat
20、ure or using warm dry air of temperature not higher than 38 C. prEN 6117:2006 5 4 Quality assurance requirements 4.1 Inspection of parts All fasteners lubricated with cetyl alcohol shall be visually inspected for presence of lubrication and complete coverage. Localized buildup in the root of threads
21、 or grooves is acceptable. The presence of a white or frosty looking film is not a cause for rejection. When internally threaded parts with a locking feature are tested and fail to meet requirements such as locking torque, breakaway or preload, they may be relubricated using higher or lower cetyl al
22、cohol content within the range defined in 3.1.2. Parts relubricated must meet inspection requirements of this specification and be retested per applicable product specification for final approval. 4.2 Solution controls Solution shall be maintained within the limits of concentration solution specifie
23、d. The solution content shall be analysed by suitable method such as gravimetric evaporation or specific gravity. 4.3 Contamination of solution Solution must be replaced when contamination is indicated by poor coating of the parts. This is evident by spotty coating, cloudy solution, dark solution, or presence of foreign particles. 5 Mixture life Not withstanding the above mentioned 4.2 and 4.3 requirements, the solution shall be fully replaced at least every six months.
