1、 ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM ASD-STAN prEN 3818 Edition P2 February 2018 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 775 8131 - www.asd-stan.org ICS: Descriptors: ENG
2、LISH VERSION Aerospace series Bolts, MJ threads, in titanium alloy TI-P64001 Strength class: 1 100 MPa (at ambient temperature) Technical specification Luft- und Raumfahrt Schrauben, MJ-Gewinde, aus Titanlegierung TI-P64001 Festigkeitsklasse: 1 100 MPa (bei Raumtemperatur) Technische Lieferbedingung
3、en Srie arospatiale Vis filetage MJ, en alliage de titane TI-P64001 Classe de rsistance : 1 100 MPa ( temprature ambiante) Spcification technique This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - S
4、tandardization). 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 publication of this Prestandard, the technical content shall not be changed to an extent that interc
5、hangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, the ASD-STAN prEN will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal
6、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 conflicting with the EN. ASD-STAN Technical Committee approves that: “This doc
7、ument is published by ASD-STAN for the needs of the European Aerospace Industry. The use of this standard is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” ASD-STAN review
8、s each standard and technical report at least every five years at which time it may be revised, reaffirmed, stabilized or cancelled. ASD-STAN invites you to send your written comments or any suggestions that may arise. All rights reserved. No parts of this publication may be reproduced, stored in a
9、retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of ASD-STAN. Order details: E-mail: salesasd-stan.org Web address: http:/www.asd-stan.org/ Edition approved for publication 1stFebruary 2018 C
10、omments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain prEN 3818:2018 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 4 4 Quality assurance 6 5 Requirements . 7 Bibliography . 22 prEN 3818:2018 (E) 3 Foreword T
11、his 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 approval for Publication. prEN 3818:2018 (E) 4 1 Scope
12、This European standard specifies the characteristics, qualification and acceptance requirements for bolts with MJ threads in TI-P64001, for aerospace applications. Strength class: 1 100 MPa1). It is applicable whenever referenced. 2 Normative references The following documents are referred to in the
13、 text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2859-1, Sampling procedures for inspect
14、ion by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection ISO 3452, Non-destructive testing Penetrant inspection General principles ISO 4288, Geometrical Product Specifications (GPS) Surface texture: Profile method Rules and procedures for the ass
15、essment of surface texture ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts ISO 6892, Metallic materials Tensile testing at ambient temperature ISO 7961, Aerospace Bolts Test methods 3 Terms and definitions For the purposes of this standard the following terms and definit
16、ions apply. 3.1 batch quantity of finished bolts, of the same type and same diameter, produced from a material obtained from the same melt, manufactured in the course of the same production cycle, following the same manufacturing route and having undergone all the relevant heat treatments and surfac
17、e treatments 3.2 inspection lot quantity of bolts from a single production batch with the same part number which completely defines the bolt 1) Minimum tensile strength of the material at ambient temperature prEN 3818:2018 (E) 5 3.3 Surface discontinuities 3.3.1 crack rupture in the material which m
18、ay extend in any direction and which may be intercrystalline or transcrystalline in character 3.3.2 seam open surface defect 3.3.3 lap surface defect caused by folding over metal fins or sharp corners and then compressing them into the surface 3.3.4 inclusions non-metallic particles originating from
19、 the material manufacturing process. These particles may be isolated or arranged in strings 3.4 simple random sampling taking of n items from a population of N items in such a way that all possible combinations of n items have the same probability of being chosen 3.5 major defect defect, other than
20、critical, that is likely to result in a failure or to reduce materially the usability of the considered product for its intended purpose 3.6 minor defect defect that is not likely to reduce materially the usability of the considered product for its intended purpose, or that is a departure from estab
21、lished specification having little bearing on the effective use or operation of this product 3.7 sampling plan plan according to which one or more samples are taken in order to obtain information and possibly to reach a decision 3.8 limiting quality LQ10in a sampling plan, the quality level which co
22、rresponds to the specified 10 % probability of acceptance 3.9 Acceptance Quality Limit AQL quality limit which in a sampling plan corresponds to a specified but relatively high probability of acceptance prEN 3818:2018 (E) 6 It is the maximum per cent defective (or the maximum number of defects per h
23、undred units) that, for purposes of sampling inspection can be considered satisfactory as a process average. 3.10 finished bolt bolt ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the product standard or definition document 3.11 definition document docum
24、ent specifying all the requirements for finished bolts 4 Quality assurance 4.1 Qualification The qualification procedure for aerospace standard products (e.g. according to EN 9133 or another in aerospace accepted and established qualification procedure) shall be used and documented according to the
25、specified tests if not otherwise agreed between customer and supplier. Qualification inspections and tests (requirements, methods, numbers of bolts) are specified in Table 1. They shall be carried out on: each type and diameter of bolt; 20 bolts selected from a single batch by simple random sampling
26、. The test programme may possibly be reduced, or the qualification be granted without inspection or testing Any such decision shall be based on the results obtained on similar types and diameters of bolts provided that the design and manufacturing conditions are identical. Table 2 indicates the allo
27、cation of bolt samples for the inspections and tests. 4.2 Acceptance 4.2.1 Purpose The purpose of acceptance inspections and tests is to check, as simply as possible, by a method representative of actual use conditions, with the uncertainty inherent to statistical sampling, that the bolts constituti
28、ng the batch satisfy the requirements of this standard. 4.2.2 Conditions Acceptance inspections and tests (requirements, methods, numbers of bolts) are specified in Table 1. They shall be carried out on each batch. Bolts from the batch to be tested shall be selected by simple random sampling. Each b
29、olt may be submitted to several inspections or tests. If a more stringent inspection is deemed necessary, all or part of the qualification inspections and tests may be performed during the acceptance inspection and testing. In this case, the number of bolts submitted to these inspections and tests i
30、s the same as that submitted for qualification inspection and tests. prEN 3818:2018 (E) 7 4.2.3 Responsability Acceptance inspections and tests shall be carried out by the manufacturer, or under his responsibility. 4.2.4 Inspection and test report A test report showing actual numerical values shall
31、be provided if specified in the purchase order. 5 Requirements See Table 1. Table 1 Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q/Aa Sample size 5.1 Material In accordance with the product standard or definition document Chemical analysis or c
32、ertificate of conformity issued by the manufacturer of the semi-finished product Q A 5.2 Dimensions, tolerances and tolerances of form and position In accordance with the product standard or definition document Standard gauging Q 15 A Table 3 and Table 4 5.3 Manufacturing 5.3.1 Forging The head of t
33、he bolts shall be forged by a hot forging process before heat treatment. According to the route of manufacture Q The equipment shall ensure a uniform temperature throughout the batch. The equipment shall be approved. 5.3.2 Heat treatment The forged blanks shall be heat treated to produce the propert
34、ies required by the definition document. According to process control Q Blanks shall not be heat treated more than twice. The equipment shall be approved. 5.3.3 Removal of surface contamination (bearing face and shank) No sign of surface contamination or oxidation If machining is required the requir
35、ements of 5.5.1 shall be respected. Visual examination 5.3.4 Heat to shank fillet The fillet radius shall be cold rolled after heat treatment and machining so as to remove all visual signs of machining and to create superficial cold working. The deformation shall not exceed the values in Figure 1. T
36、he requirements apply on bolts except on the following: a) threaded to head bolts; b) bolts with a nominal diameter the transition temperature of the beta range without subsequently receiving adequate working within the alpha/beta temperature range. Overheating of the head, except for the bearing su
37、rface, is permitted provided that its maximum depth, measured normal to the surface of the head, does not exceed: 1,5 mm for diameters 16 mm; 2,8 mm for diameters 18 mm. A WIDMANSTATTEN or equi-axed grain structure of beta origin without primary alpha is regarded as overheating. Surface contaminatio
38、n on the non-bearing surfaces of the head shall not exceed 0,08 mm for all diameters. It is not permitted on other surfaces. Microscopic examination at a magnification of 100, after appropriate etching A5.5.4 Hydrogen content 0,012 5 % on material removed from the head The equipment shall be approve
39、d. Q 3 A 1 per inspection lot 5.5.5 Surface discontinuities (before coating) See Table 9 and Table 10. Fluorescent penetrant inspection according to ISO 3452 Q 5 Care shall be exercised to avoid confusing cracks with other discontinuities. A Penetrant Table 3 and Table 4 Cracked bolts and those havi
40、ng discontinuities transverse to axis (i.e. at an angle more than 10 to the longitudinal axis) shall be rejected and destroyed. Suspect bolts to be submitted to microscopic examination, see 5.5.3. Micro-scopic Table 6 5.5.6 Micro-structural shearing of threads Not permissible Microscopic examination
41、, see 5.5.3. Q 5 Reject production batch on one or more bolts showing a defect. A Table 6 Bolts from the suspect batch to be submitted to ISO 7961 stress durability test: loads: Table 5; duration: 5 h min. Q 5 A Table 6 prEN 3818:2018 (E) 11 Clause Characteristic Requirement Inspection and test meth
42、od Q/Aa Sample size 5.6 Product identification Marking in accordance with the product standard or definition document Visual examination Q 20 A Table 3 and Table 4 5.7 Packaging The bolts shall be packed in such a way as to prevent any damage or corrosion occurring in the course of handling, transpo
43、rtation and storage. Each basic package shall only contain bolts with the same part number and of the same batch. Visual examination A 100 % 5.8 Labelling Each basic package shall bear a label upon which is legibly recorded: designation as specified by the product standard or definition document; qu
44、antity; batch number; manufacturers name and trade mark. Visual examination A 100 % aQ: Qualification, A: Acceptance. Table 2 Allocation of qualification testing requirements Characteristic Defined in Bolt sample number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Non destructive Dimensions, t
45、olerances and tolerances of form and position 5.2 X X X X X X X X X X X X X X X Heat to shank fillet 5.3.4aX X X X X Surface roughness 5.3.6aX X X X X Surface coating 5.3.7 X X X X X Recess torque 5.4.3 X X X X X Surface discontinuities 5.5.5aX X X X X Product identification 5.6 X X X X X X X X X X
46、X X X X X X X X X X Destructive Tensile strength 5.4.1 X X X X X Tension fatigue stress 5.4.2 X X X X X Head to shank grain flow 5.5.1 X X X X X Thread grain flow 5.5.2 X X X X X prEN 3818:2018 (E) 12 Characteristic Defined in Bolt sample number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Mic
47、rostructure, overheating and surface contamination 5.5.3 X X X X X Hydrogen content 5.5.4 X X X Microstructural shearing of threada5.5.6 microscopic X X X X X stress durability X X X X X aIf stress durability test is necessary to meet 5.5.6 requirements, then tensile test 5.4.1 is not required.Table
48、 3 Classification of defects Category of defect AQL Characteristic concerned Major 0,065 % Surface discontinuities 1,0 % Thread size Shank diameter Grip length Fillet radius: distortion and dimensions Drilled holes missing when required Surface roughness Burrs and tool marks Surface coating Product
49、identification Depth of lightening hole in head when required Thread form Incomplete threads Head angle (countersunk heads) Recess removal torque Perpendicularity of the head bearing surface to shank Straightness of shank Minor 2,5 % Overall length Head diameter Lightening hole diameter Drilled hole position tolerance and diameter Wrenching configuration Runout of the head outside diameter to shank
