SAE AS 6507-2015 Test Method and Limits for Bow Height of Aluminum Sheet Samples After Chemical Milling.pdf

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4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS6507 AEROSPACE STANDARD AS6507 Issued 2015-03 Test Method and Limits for Bow He

5、ight of Aluminum Sheet Samples After Chemical Milling RATIONALE This new SAE Aerospace Standard (AS) defines the test method and limits for the bow height of aluminum sheet samples after chemical milling. 1. SCOPE 1.1 The results of this test are intended to be a useful indication of the resistance

6、to distortion of bare or two-side Alclad, flat sheet aluminum used in chemical milling applications. 1.2 This specification covers requirements for testing wrought aluminum alloy raw material in the form of sheet by producers. 1.3 This Aerospace Standard applies only to heat treated, flat sheet in t

7、he heat treated condition (T3X, T6X, T7X, or T8X) temper, and having thicknesses in the range 0.032 to 0.249 inch (0.8 to 6.3 mm). Purchasers are encouraged to contact producers with questions on the availability of material (i.e. alloy/temper/width) that is capable of meeting the requirements of th

8、is standard. Product having the capability prescribed by this specification is available in limited quantities and tempers because of the special processing required. NOTE: Sheet in the coiled form cannot be supplied to this specification. 1.4 This specification is used to indicate the resistance to

9、 distortion of bare and two-side Alclad, flat sheet aluminum that will be chemically milled (often in the manufacture of aircraft skin panels). 1.5 This Aerospace Standard is intended to be a supplemental requirement added to the aluminum sheet specification purchase orders for product which is to b

10、e used in chemical milling operations. 2. APPLICABLE DOCUMENTS The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase

11、 order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1 ASTM Publications Available fro

12、m ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM E29 Using Significant Digits in Test Data to Determine Conformance with Specifications SAE INTERNATIONAL AS6507 Page 2 of 4 3. TECHNICAL REQUIREMENTS 3.1 The aluminum s

13、heet for which this Aerospace Standard is specified shall meet all the requirements of the referenced material specification and the additional requirements listed below. 3.2 Allowable Bow Height Change After chemical milling of test panels in accordance with the procedure in Section 4, the bow heig

14、ht change, h shall not exceed the limits shown in Table 1 for bare sheet and in Table 2 for two-side Alclad sheet when tested as defined in 4.5. where: h1 = the height of the original bow of the specimen h2 = the height of the bow of the specimen after chemical milling h = h2-h1 Table 1 - Maximum sp

15、ecimen bow height change allowed for bare sheet products Material Thickness Maximum Bow Height Change Allowed (h) 0.032 inch (0.81 mm) to 0.071 inch (1.80 mm), incl 0.375 inch (9.5 mm) Over 0.071 inch (1.80 mm) to 0.140 inch (3.56 mm), incl 0.30 inch (7.6 mm) Over 0.140 inch (3.56 mm) to 0.249 inch

16、(6.3 mm), incl 0.20 inch (5.0 mm) Table 2 - Maximum specimen bow height change allowed for two-side alclad sheet products Material Thickness Maximum Bow Height Change Allowed (h) 0.032 inch (0.81 mm) to 0.045 inch (1.14 mm), incl 0.375 inch (9.5 mm) Over 0.045 inch (1.14 mm) to 0.140 inch (3.56 mm),

17、 incl 0.30 inch (7.6 mm) Over 0.140 inch (3.56 mm) to 0.249 inch (6.3 mm), incl 0.20 inch (5.0 mm) 4. PROCEDURE 4.1 Condition This test is applied to material in final heat treated temper condition. 4.2 Test Specimens 4.2.1 Test specimens shall be cut samples having dimensions of 2.0 inches x 12.0 i

18、nches (50 mm x 300 mm), with the length parallel to the rolling direction of the sheet. Remove saw burrs from test specimen, if necessary, to facilitate accurate bow height measurements. 4.2.2 If the specimen is not flat, measure the height of the bow, h1, according to requirements of 4.5.1. 4.2.3 I

19、nitial bow height h1 shall not exceed 0.060 inch (1.50 mm). 4.2.4 Retain an adjoining portion of the sheet for use as an initial thickness reference until the completion of the test. 4.3 Application of Masking Material 4.3.1 The side of the test specimen, which is not to be chemically milled, shall

20、be protected with maskant (e.g., tape, sealant or a suitable paint) applied per the maskants instructions. 4.3.2 If the test specimen is not flat, apply the maskant to the convex side and chemically mill the concave side. SAE INTERNATIONAL AS6507 Page 3 of 4 4.4 Chemical Milling 4.4.1 Appropriate sa

21、fety protection shall be taken by the operator, in accordance with local requirements. 4.4.2 The test specimen shall be immersed in a caustic soda solution, 10 to 15% by weight NaOH at 150 to 190 F (66 to 88 C) or other approved chemical milling solution for sufficient time to etch away 50% 5% of th

22、e original sheet thickness. Appropriate tooling or other fixturing shall be used to allow uniform etching over the entire unprotected side. 4.4.3 After etching, test specimens shall be rinsed in water, and then neutralized by immersion in a 30 to 70% by volume HNO3 solution, and given a final rinse

23、in water. 4.5 Bow Height Measurement The initial and final bow of the specimen shall be measured by placing the test specimen on a hard, flat surface with no pressure other than the weight of the specimen. 4.5.1 Initial Measurement - Before Chemical Milling 4.5.1.1 Before applying the maskant, place

24、 the specimen on a flat surface with the with the test specimens ends in contact with the flat surface (i.e., test specimen concave side facing down). 4.5.1.2 Measure the maximum bow height found along the length of the test specimen by measuring the gap between the flat surface and the bottom of th

25、e specimen at the edge of the test specimen. Measure the bow height to at least the nearest 0.001 inch (0.025 mm) and report the bow height to the nearest 0.01 inch (0.25 mm) in accordance with the rounding rules of ASTM E29. 4.5.2 Final Measurement - After Chemical Milling 4.5.2.1 Remove the maskan

26、t per the manufacturers instruction, taking care to avoid bending the sample. 4.5.2.2 Place the specimen with the maskant removed on a hard, flat surface with the test specimens ends in contact with the flat surface (i.e., test specimen concave side facing down). 4.5.2.3 Measure the maximum bow heig

27、ht found along the length of the test specimen by measuring the gap between the flat surface and the bottom of the specimen at the edge of the test specimen. Measure the bow height to at least the nearest 0.001 inch (0.025 mm) and report the bow height to the nearest 0.01 inch (0.25 mm) in accordanc

28、e with the rounding rules of ASTM E29. 4.5.2.4 The bow height change of the specimen shall meet the requirements of Tables 1 or Table 2 in 3.2. 5. QUALITY ASSURANCE PROVISONS 5.1 Responsibility for Inspection 5.2 The producer of sheet shall supply all samples for producers tests and shall be respons

29、ible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the sheet conforms to specified requirements. 5.3 Classification of Tests 5.3.1 Acceptance Tests Bow height change (3.2) is an acceptance tes

30、t and shall be performed on each inspection lot or as approved by the purchaser. SAE INTERNATIONAL AS6507 Page 4 of 4 5.4 Sampling and Testing One sample, from the mid-width location, shall be tested from each lot. 5.5 Reports The producer shall include with each shipment a “Certificate of Conforman

31、ce”, including individual test result, for each lot supplied, certifying that the material meets all the requirements of this AS. Producer shall also determine that the material meets all criteria of any other referenced material specification. 6. ACKNOWLEDGEMENT The producer shall mention this spec

32、ification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Sheet not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection 8. NOTES 8.1 A change bar (l) located in the left margin is for the c

33、onvenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not

34、used in original publications nor in documents that contain editorial changes only. 8.2 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primar

35、y units and are presented only for information. 8.3 Purchase documents should specify not less than the following: AS6507 with reference to an applicable bare or two-side Alclad aluminum sheet AMS specification and all requirements specified by that AMS specification. PREPARED BY SAE AMS COMMITTEE “D“