SAE-ARP-4992A-2004.pdf
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1、 AEROSPACE RECOMMENDED PRACTICE Periodic Test Plan for Processing Solutions SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitabili
2、ty for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright
3、 2004 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER:
4、 Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS: http:/www.sae.org Issued 1996-08 Revised 2004-08 Superseding ARP4992 ARP4992 REV. A 1. SCOPE: 1.1 Scope: This SAE Aerospace Recommended Practice (ARP) describes a metho
5、d for classifying the frequencies of analysis of solutions used in the processing of metals, such as electroplating, anodizing, and conversion coating and associated processes but usage is not limited to such applications. 1.2 Intent: This document is intended to establish a periodic test plan that
6、may be used by processors to satisfy the requirement of an Aerospace Material Specification (AMS) for a chemical processing solution periodic test plan as a control factor. 1.3 Limitation: This document does not fulfill the criteria for a formal statistical process control program. 2. APPLICABLE DOC
7、UMENTS: This section is not applicable to this document. 3. TECHNICAL REQUIREMENTS: 3.1 The analysis of process solution constituents shall be performed at such a frequency as to ensure that the solution is not operated beyond the concentration limits authorized by the applicable specification or wo
8、rk instruction. SAE ARP4992 Revision A - 2 - 3.2 Classes of test frequency used herein. TABLE 1 Class Frequency of Analysis Y Annually 2Y Semiannually 4Y Quarterly 6Y Bimonthly M Monthly 2M Biweekly W Weekly 2W Semiweekly 3W Three times each week D Daily SH Once each working shift BP Before processi
9、ng each production load 3.3 Definitions: 3.3.1 Specification Range: The concentration range of a constituent in a solution required by the applicable process specification or work instruction. 3.3.2 Process Control Range: A concentration range that is 75% of the Specification Range. It is a tool use
10、d to aid in the establishment of a frequency of process control testing. 3.4 Calculation of Process Control Range: 3.4.1 Subtract the lower permissible concentration limit to the Specification Range (A) for each constituent from the higher permissible concentration limit to the Specification Range (
11、B) and multiply by 0.25. 3.4.1.1 For those processes where a constituents concentration decreases with use, add this value to the lower permissible limit. The upper limit value remains as specified by the process specification or work instruction (B). Lower limit to Process Control Range = A + (B-A)
12、 x 0.25. 3.4.1.2 For those processes where a constituents concentration increases with use, subtract this value from the higher permissible limit. The lower limit value remains as specified by the process specification or work instruction (A). Upper limit to Process Control Range = B - (B-A) x 0.25.
13、 3.4.2 When there is no lower limit to the Specification Range, only a maximum limit, multiply this number by 0.75. Upper limit to Process Control Range = 0.75 x B. SAE ARP4992 Revision A - 3 - 3.4.3 When there is no upper limit to the Specification Range, only a minimum limit, multiply this number
14、by 1.33. Lower limit to Process Control Range = 1.33 x A. 3.5 Example Calculations: The following example applies to AMS 2649, Etch Inspection of High Strength Steels. All these concentrations or values normally decrease with use. TABLE 2 Constituent Specification Range Process Control Range Nitric
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