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1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED APRIL 1998 BS SP 164:1978 Specification for Design and performance requirements for turnlock, stud-type panel fasteners (metric series) UDC 629.7:621.888 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:00 GMT+00:
2、00 2006, Uncontrolled Copy, (c) BSI BS SP 164:1978 This British Standard, having been prepared under the direction of the British Aerospace Standards Committee, was published under the authority of the Executive Board on 31 August 1978 BSI 02-2000 The following BSI references relate to the work on t
3、his standard: Committee reference ACE/14 Draft for comment 76/76927 DC ISBN 0 580 10170 3 Foreword This British Standard has been prepared at the request of the British Aerospace Industry to specify the requirements for the design and performance of turnlock stud-type panel fasteners. A British Stan
4、dard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover,
5、 an inside front cover, pages i and ii, pages 1 to 21 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Lice
6、nsed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 164:1978 BSI 02-2000i Contents Page ForewordInside front cover Section 1. General 1Scope1 2References1 3Definitions1 4Symbols for fasteners1 5Stud head configur
7、ations1 Section 2. Design requirements 6All turnlock fasteners1 7RQA and FQA fasteners: special design requirements2 8MSQA fasteners: special design requirements3 Section 3. Performance requirements 9All turnlock fasteners3 10MSQA fasteners: special performance requirements4 Section 4. Quality assur
8、ance and product qualification testing requirements 11Quality assurance4 12Product qualification testing4 Section 5. Product qualification tests 13General4 14Initial tension and sheet separation4 15Operating torque loads4 16Tensile loads5 17Shear loads6 18Vibration6 19Axial slippage and staking brea
9、kout (MSQA fasteners only)6 20Resistance to corrosion6 Section 6. Preparation for delivery 21Packaging6 22Labelling7 Appendix A Test schedule8 Figure 1 Typical tension and torque specimen for MSQA fasteners9 Figure 2 Typical tension and torque test rig for MSQA fasteners10 Figure 3 Typical shear spe
10、cimen and test rig for MSQA fasteners11 Figure 4 Typical vibration and endurance specimens and test rig for MSQA fasteners12 Figure 5 Typical vibration and endurance test rig for MSQA fasteners13 Figure 6 Typical operation test rig for MSQA fasteners14 Figure 7 Typical tensile load test rig for axia
11、l tensile test for RQA and FQA fasteners15 Figure 8 Typical tensile load test rig for 15 offset tensile test for RQA and FQA fasteners16 Figure 9 Insert plates for tension and endurance test specimens for RQA and FQA fasteners17 Licensed Copy: London South Bank University, London South Bank Universi
12、ty, Sat Dec 09 03:21:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 164:1978 ii BSI 02-2000 Page Figure 10 Typical shear load test rig for RQA and FQA fasteners18 Figure 11 Typical vibration test plates for RQA and FQA fasteners19 Figure 12 Typical assembly of vibration test plates for RQA and
13、FQA fasteners20 Figure 13 Typical mounting of specimen for vibration test for RQA and FQA fasteners21 Table 1 Offset tolerance and diameter difference3 Table 2 Performance requirements5 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:00 GMT+00:00 2006, Unc
14、ontrolled Copy, (c) BSI BS SP 164:1978 BSI 02-20001 Section 1. General 1 Scope This specification stipulates the design and performance requirements for stud-type, turnlock panel fasteners for use in aerospace applications where primary structural loads are not involved. This specification embraces
15、single unit assembly fasteners of the rigid and floating receptacle types and multi-fastener strip receptacle assemblies. 2 References This standard makes reference to the following standards publication. BS 3G 100, General requirements for equipment for use in aircraft Part 2: All equipment Section
16、 3: Environmental conditions Subsection 3: Salt mist. 3 Definitions For the purposes of this British Standard the following definitions apply. 3.1 fastener a device used to secure a panel by the operation of a stud of restricted rotation which engages a locking element in a receptacle. Such a fasten
17、er shall be designated “turnlock” 3.2 stud or stud assembly that element of the fastener which is permanently fixed to the panel for operational purposes 3.3 receptacle that element of the fastener which is permanently fixed to the panel support structure 3.4 grommet a device used for one or more of
18、 the following purposes: a) to retain the stud in the panel; b) to protect the panel during operation of the stud; c) to increase the load-carrying capacity of the fastener. 3.5 float the permitted amount of lateral movement, in any direction, of the relative positions of stud and receptacle 3.6 per
19、formance class the relative performance requirements of the RQA and FQA fasteners (see clause 4) covered by this specification and which are designated class 1, class 2 and class 3. (See Table 2 for details) 3.7 failure the point at which one or more of the fastener component parts fractures or brea
20、ks or where distortion and permanent set prevent the locking and unlocking of the fastener 4 Symbols for fasteners For the purposes of this specification the following symbols are used: 5 Stud head configurations The stud head configuration and type of driving recess are optional. Section 2. Design
21、requirements 6 All turnlock fasteners 6.1 General. Fasteners shall comply with all the requirements defined on the approved fastener drawing or standard and comply with the requirements of this specification. 6.1.1 Fasteners shall be of uncomplicated construction and shall be capable of being fitted
22、 to both panel and support structure with simple hand tools that are recommended by the manufacturer. 6.1.2 The fastener shall provide for retention of the stud in the panel when unlocked. 6.1.3 The fasteners shall be so constructed that neither the stud assembly nor the receptacle assembly can be i
23、nadvertently disassembled during normal operation. 6.1.4 Where the stud is retained in the panel by means of a grommet, the grommet shall be capable of being removed without damage to the panel or stud. 6.1.5 Studs shall be so designed that the fasteners shall be capable of being operated without th
24、e use of special tools. SymbolFastener description RQAPanel fastener, turnlock, rigid receptacle, quick action stud type. FQAPanel fastener, turnlock, floating receptacle, quick action stud type. MSQAPanel fastener, turnlock, multi-fastener, strip receptacle, quick action stud type. Licensed Copy: L
25、ondon South Bank University, London South Bank University, Sat Dec 09 03:21:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 164:1978 2 BSI 02-2000 6.1.6 Fasteners shall be so designed that their operation is not impeded by the presence of small foreign particles (e.g. grit) and shall at all time
26、s be capable of operation without lubrication. 6.1.7 Fasteners shall be free from burrs, tool marks and other defects that may adversely affect serviceability or performance as defined in this specification. 6.2 Materials 6.2.1 Fasteners shall be manufactured from materials such that the fasteners s
27、hall be capable of meeting the performance and test requirements specified in this standard. 6.2.2 All materials used in the manufacture of the fasteners shall be compatible with high aromatic fuels, lubricants and other fluids (e.g. de-icing fluids, hydraulic fluids) normally encountered in aerospa
28、ce vehicles. 6.3 Protective treatment 6.3.1 Protective treatment that is in accordance with specifications approved for use in the design of aerospace vehicles shall be applied, where appropriate, to all fastener parts. 6.3.2 Precautions shall be taken to guard against corrosion due to electrolytic
29、action that may develop between contacting dissimilar materials, particularly in the presence of moisture or any of the fluids stated in 6.2.2. 6.4 Interchangeability 6.4.1 All parts having a manufacturers identical part number shall be directly and completely interchangeable with each other in resp
30、ect of installation and performance. 6.4.2 For the purpose of interchangeability the parts of the fastener regarded as indivisible are the stud, the receptacle and the grommet. 6.5 Functional requirements 6.5.1 When mounted on the panel, studs shall not be free to become misaligned to an extent that
31、 will prevent each stud entering its receptacle when the panel is offered up to the support structure for attachment. 6.5.2 Not more than 180 clockwise rotation of each stud shall thereafter be required before it engages the locking element in the receptacle. 6.5.3 After the stud has made initial en
32、gagement with the locking element, it shall be positively locked with 85 to 135 of clockwise rotation, when viewed from the outside of the panel. 6.5.4 The centre line of a screwdriver slot driving recess shall lie along the centre line of the receptacle mounting attachment when the fastener is in t
33、he locked position. 6.5.5 The stud shall completely unlock within 85 to 135 of anti-clockwise rotation when viewed from the outside of the panel. 6.5.6 There shall be definite indication, either visual or tactile, that the fastener is in the fully locked position (see 6.5.4) and there shall be a pos
34、itive stop to prevent the stud from being turned past the fully locked position. 6.5.7 Fasteners shall be fully operable over the temperature range 35 C to + 70 C and shall maintain efficient locking over the temperature range 70 C to + 90 C. 6.5.8 Flushhead studs shall be so designed that, with the
35、 fastener assembled and fully locked in the panel, the head shall be flush with the outer surface of the panel within 0.4 mm. 6.6 Identification marking 6.6.1 The minimum head marking of the fastener in a position that is visible when the fastener is installed, shall be: a) the manufacturers identif
36、ication; b) the length coding. Where space permits, the complete part number shall be added. 6.6.2 The precise position of the marking shall be as defined on the manufacturing drawing. 6.6.3 The size of characters shall be 0.5 mm minimum. Indented markings shall be not deeper than 0.25 mm. Embossed
37、markings shall not protrude more than 0.25 mm. 7 RQA and FQA fasteners: special design requirements 7.1 RQA and FQA fasteners shall comply with the special design requirements specified in 7.2. 7.2 Special requirements 7.2.1 The fasteners shall be either of the stud-receptacle type or of the stud-gr
38、ommet-receptacle type. 7.2.2 FQA fasteners shall be capable of efficient operation with the centre line of the stud offset from the vertical centre line of the receptacle in any direction laterally, by the distance specified in Table 1 as the offset tolerance. 7.2.3 The fasteners shall have adequate
39、 bearing area beneath the stud head when in contact with the panel such that no failure of the fastener occurs when subjected to the tests specified in section 5. The minimum difference between the maximum diameter of the hole in the panel and the minimum diameter of the stud underneath the head sha
40、ll be as specified in Table 1. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 164:1978 BSI 02-20003 Table 1 Offset tolerance and diameter difference 8 MSQA fasteners: special design requirements 8.1 MSQA
41、 fasteners shall comply with the special design requirements specified in 8.2. 8.2 Special requirements 8.2.1 Fasteners shall be of the multi-fastener strip receptacle type. 8.2.2 The fasteners shall be capable of efficient operation with the centre line of the stud offset from the vertical centre l
42、ine of the receptacle feature by 0.5 mm in any direction laterally. Section 3. Performance requirements 9 All turnlock fasteners 9.1 General. The general performance requirements stated in 9.2 to 9.7 shall apply to all fasteners. Type qualification tests are specified in section 5. 9.2 Operating tor
43、que 9.2.1 Maximum locking torque. The maximum locking torque under normal operating conditions shall be as stated in Table 2. With the panel and the structure separated by the addition of a 0.25 mm shim to simulate the intrusion of a foreign object, the maximum locking torque shall not exceed 133 %
44、of the maximum locking torque permitted under normal operating conditions. 9.2.2 Minimum unlocking torque. The minimum unlocking torque under normal operating conditions shall be as stated in Table 2. With the combined panel and support thickness reduced by 0.25 mm to simulate wear, the minimum unlo
45、cking torque shall be not less than 67 % of the minimum unlocking torque permitted for normal operating conditions. 9.2.3 Locking stop. The locking stop shall withstand the required torque load as specified in Table 2. 9.3 Tensile load 9.3.1 Initial tension. The initial tension, which is the normal
46、clamped tension developed by the assembly when locked, shall be as stated in Table 2. 9.3.2 Sheet separation. The sheet separation in the immediate area to the fastener shall not exceed 1.2 mm for the tensile proof load specified in Table 2. 9.3.3 Tensile proof load. The fastener shall be subjected
47、to the application of the tensile proof load specified in Table 2. The fastener shall not thereafter develop a permanent set in excess of 0.2 mm for classes 1 and 2 and 0.15 mm for class 3. After the release of the tensile proof load, no change in the maximum locking torque and the minimum locking t
48、orque, as stated in Table 2, shall be discernible. 9.3.4 Tensile ultimate load. The fastener shall withstand, without failure, the application of a load equal to 150 % of the tensile proof load. 9.4 Shear load 9.4.1 Shear proof load. The fastener shall be subjected to the shear proof load specified
49、in Table 2 without signs of permanent deformation. After the release of the shear proof load, no change in the maximum locking torque and the minimum locking torque, as stated in Table 2, shall be discernible. 9.4.2 Shear ultimate load. The fastener shall withstand, without failure, the application of a shear load equal to 150 % of the shear proof load. 9.5 Operating endurance 9.5.1 The fastener shall withstand the required number of operating endurance cycles as specified in Table 2. A cycle is one complete locking and unlock
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