1、AEROSPACE MATERIAL SPECIFICATION AMS2430 REV. T Issued 1948-09 Revised 2015-01 Superseding AMS2430S Shot Peening, Automatic RATIONALE Figure 1 was relabeled as “Acceptable Cast Media Shapes” and Figure 2 Acceptable Shapes from Revision R was restored and labeled “Acceptable Cut Media Shapes”. This w
2、as done as there is significant enough difference between cast and cut media shapes. Restored default tolerance for areas to be peened from Revision R as many engineering drawings do not specify this. NOTICE ORDERING INFORMATION 1. The following information should be provided to the shot peen proces
3、sor by the purchaser. If the purchaser does not provide any of the following, the processor shall use the specification provisions herein. a. Purchase order number and revision level b. Part number and revision level c. Part alloy and tensile strength and/or hardness d. Quantity of parts e. AMS2430T
4、 f. Media type, hardness, size in accordance with AMS2431. (3.1) g. Test strip type. (3.2.2) h. Pre-shot peen cleaning method. (3.3.3.2) i. Intensity requirement. (3.5.1) j. Intensity verification locations. (3.5.1 and 3.7) k. Coverage requirement. (3.5.2) l. Coverage verification method and if use
5、of fluorescent tracer or dye marker inks requires cognizant engineering organization approval. (3.5.2) m. Part locations to be shot peened, free from peening, or peening optional. (3.5 and 3.6) n. If externally applied forces are permitted on part during processing. (3.4.2) o. If purchaser requires
6、approval of the processors quality control system (4.3.1) and shot peening parameter sheet prior to production. (4.3.2 and 3.7) p. If purchaser allows the use of alternative intensity verification methods. (3.7.1.1) q. Post-shot peen cleaning method: include instruction and procedure to remove iron
7、contamination, if applicable; and, if purchaser requires peening processor to perform this operation. (3.9.1) r. Part preservation/shipping method. (3.9.2 and 5.1) _ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering s
8、ciences. The use of this report 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.” SAE reviews each technical report at least every five years at which time it may be revis
9、ed, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2015 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, photocop
10、ying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide fee
11、dback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS2430T SAE INTERNATIONAL AMS2430T Page 2 of 20 1. SCOPE 1.1 Purpose This specification covers the requirements for automatic shot peening of surfaces of parts by impingement of media, including metallic, glass, or c
12、eramic shot. 1.2 Application Shot peening is typically used to induce residual surface compressive stresses in metal parts to increase fatigue strength and resistance to stress-corrosion cracking for parts such as axles, springs (helical, torsional and leaf), gears, shafting, aircraft landing gear,
13、structural parts, and similar items but usage is not limited to such applications. Ceramic and glass shot peening, either wet or dry, may be used when iron contamination of stainless steel or non-ferrous parts is a consideration. 1.3 Related peening processes, such as tumble peening, manual peening,
14、 peen forming and straightening, peening for prevention of intergranular corrosion, and peening to produce a surface texture, are beyond the scope of this specification. 1.4 Shot peening in accordance with AMS2432 meets or exceeds the requirements of AMS2430. Part certification in accordance with AM
15、S2432 is acceptable in addition to AMS2430. See 4.5. 1.5 This is a peening process specification. Shot peening design guidance for the cognizant engineering organization is provided in Section 8 for information only. 1.6 Legacy Provision When AMS-S-13165 or MIL-S-13165 is specified and a peening pro
16、cedure has been approved by or acceptable to the purchaser or cognizant engineering organization, the peening processor may continue to use the previously approved or accepted equipment, practices, and test methods to satisfy the specified requirements of AMS2430T, subject to approval by the purchas
17、er. 1.6.1 Batch or Barrel Peening Cognizant engineering organization approval of the peening procedure and inspection is required for the use of batch or barrel peening processes and machinery, such as tumble or barrel peening until an AMS document controlling this process is published. 1.6.2 Manual
18、 peening is not directly addressed by this specification. Prior and future applications should be as agreed upon between processor and the cognizant engineering organization. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this
19、 specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall a
20、pply. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA, www.sae.org. AMS2431 Peening Media, General Requirements AMS2432 Shot Peening, Computer Monitored SAE INTERNATIONAL
21、AMS2430T Page 3 of 20 SAE J442 Test Strip, Holder, and Gage for Shot Peening SAE J443 Procedures for Using Standard Shot Peening Almen Strip SAE J2277 Shot Peening Coverage Determination 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken,
22、 PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM B214 Standard Test Method for Sieve Analysis of Metal Powders ASTM E11 Wire Cloth and Sieves for Testing Purposes 3. TECHNICAL REQUIREMENTS 3.1 Peening Media 3.1.1 New Media 3.1.1.1 New peening media shall conform to the requirements of AMS2431.
23、3.1.1.2 If conditioned cut wire shot is permitted by the cognizant engineering organization, conditioned carbon steel cut wire shot in accordance with AMS2431/3 or AMS2431/8 or conditioned stainless steel cut wire shot in accordance with AMS2431/4 and of the equivalent size corresponding to the spec
24、ified cast steel shot in Table 1, may be used only when the shot hardness is the same or greater than the specified cast steel shot. 3.1.1.3 For steels heat treated above 200 ksi, hard media in accordance with AMS2431/2, /7, or /8 is required if media hardness is not specified on the part drawing or
25、 by the cognizant engineering organization. 3.1.2 In-process Media Media in use during the process shall be inspected and conform to the size and shape requirements in accordance with Tables 1, 2A, and 2B and Figures 1 and 2. SAE INTERNATIONAL AMS2430T Page 4 of 20 Table 1 - Size requirements of in-
26、process media Cast Shot Sizes ASR or ASH1Cut Wire Shot Sizes AWCR AWS AWCH1Glass Shot Sizes AGB1Ceramic Shot Sizes AZB10.5% Maximum by weight allowed to be retained on U.S. Sieve2, Size mm (inch) Maximum 20% By Weight Passing U.S. Sieve2, Size mm (inch) 930 116 5, 4.00 (0.157) 8, 2.36 (0.0937) 780 9
27、6 6, 3.35 (0.132) 10, 2.00 (0.0787) 660 80 200 7, 2.80 (0.110) 12, 1.7 (0.0661) 550 62 170 8, 2.36 (0.0937) 14, 1.4 (0.0555) 460 54 150 10, 2.00 (0.0787) 16, 1.18 (0.0469) 390 47 12, 1.7 (0.0661) 18, 1.00 (0.0394) 330 41 100 850 14, 1.4 (0.0555) 20, 0.850 (0.0331) 35 16, 1.18 (0.0469) 25, 0.710 (0.0
28、278) 280 32 16, 1.18 (0.0469) 25, 0.710 (0.0278) 230 28 70 600 18, 1.00 (0.0394) 30, 0.600 (0.0234) 190 23 20, 0.850 (0.0331) 35, 0.500 (0.0197) 170 20 50 425 25, 0.710 (0.0278) 40, 0.425 (0.0165) 130 17 30, 0.600 (0.0234) 45, 0.355 (0.0139) 110 14 35 300 35, 0.500 (0.0197) 50, 0.300 (0.0117) 30 40,
29、 0.425 (0.0165) 60, 0.250 (0.0098) 25 210 45, 0.355 (0.0139) 70, 0.212 (0.0083) 70 12 40, 0.425 (0.0165) 80, 0.180 (0.0070) 20 60, 0.250 (0.0098) 80, 0.180 (0.0070) 18 150 60, 0.250 (0.0098) 100, 0.150 (0.0059) 15 70, 0.212 (0.0083) 120, 0.125 (0.0049) 100 80, 0.180 (0.0070) 230, 0.063 (0.0025) 12 1
30、00, 0.150 (0.0059) 170, 0.090 (0.0035) 10 120, 0.125 (0.0049) 200, 0.075 (0.0029) 9 140, 0.106 (0.0041) 230, 0.063 (0.0025) 6 170, 0.090 (0.0035) 325, 0.045 (0.0017) 1See AMS2431 for definitions. 2Sieve specified in ASTM E11. Figure 1 - Acceptable CAST media shapes SPHERE ELLIPSOID SPHEROID Fully Co
31、nsolidated Particles Figure 2 Acceptable cut media shapes SAE INTERNATIONAL AMS2430T Page 5 of 20 Table 2A - Shape requirements of in-process non-metallic media Sample Size (Inches) Glass Shot Sizes AGB1Max Allowable Number of Unacceptable Glass Shot Shapes Ceramic Shot Sizes AZB1 Max Allowable Numb
32、er of Unacceptable Ceramic Shot Shapes 1 x 1 200 14 1 x 1 170 19 1 x 1 140 28 x 100 14 850 14 x 70 28 600 28 x 50 14 425 14 x 35 28 300 28 x 30 40 1/8 x 1/8 25 14 210 14 1/8 x 1/8 18 28 150 28 1/8 x 1/8 15 40 1/8 x 1/8 12 57 100 57 1/8 x 1/8 9 122 1/8 x 1/8 6 240 1See AMS2431 for definitions. Table
33、2B - Metallic media shape maintenance requirements Sample Size (Inches) Cast Shot Sizes ASR or ASH1 Maximum Allowable Number of Unacceptable Cast Shot Shapes Cut Wire Shot Sizes AWCR, AWS, AWCH1 Maximum Allowable Number of Unacceptable Cut Wire Shot Shapes 1 x 1 930 4 116 4 1 x 1 780 5 96 5 1 x 1 66
34、0 7 80 7 1 x 1 550 9 62 9 1 x 1 460 16 54 16 1 x 1 390 22 47 22 x 330 7 41 7 x - - 35 9 x 280 9 32 9 x 230 14 28 14 x 190 22 23 22 x 170 31 20 31 x 130 9 17 9 x 110 14 14 14 x 70 22 12 22 1See AMS2431 for definitions. 3.2 Equipment and Materials The following types of equipment and materials shall b
35、e provided for the peening of parts. SAE INTERNATIONAL AMS2430T Page 6 of 20 3.2.1 Peening Machine 3.2.1.1 The peening machine shall run automatically and may be computer controlled. Machine monitoring may be performed in accordance with AMS2432. The machine shall provide a means of propelling, at a
36、 controlled rate, media with air pressure against the part. Alternatively, media may be propelled by centrifugal force. The machine shall provide a means of moving, at a uniform speed, either the part through the media stream or the media stream over the part in either translation, rotation, or both
37、, as required. The nozzles and the part shall be held and moved mechanically. The part shall not be subjected to any random movement during the process. The machine shall be capable of consistently reproducing the required shot peening intensities. 3.2.1.2 The machine shall incorporate equipment to
38、extract dust and fine particle contaminants from the in-process media unless the purchaser permits its absence. Equipment may include a media separator to mechanically control size and shape such as vibrating screens, spiral device, or inclined belt. 3.2.1.3 For machines using pressurized air, a fun
39、ctioning low air pressure alarm shall be incorporated in the air supply system. 3.2.1.4 For wet shot peening, a separator is not required but the entire slurry shall be changed often enough that the peening intensity under any given set of parameters remains within established limits for that set of
40、 parameters. Fresh shots may be added once between changes of the entire slurry to maintain the peening intensity. 3.2.2 Test Strips Almen test strips, subsize test strips, and shaded or masked test strips shall conform to SAE J442 and usage shall conform to SAE J443. 3.2.2.1 An alternative method w
41、here conditions are not advantageous for standard test strips, subsize or otherwise standard shaded or masked test strips may be used for control of peening intensity. The correlation between the peening intensity measured with subsize or shaded or masked test strips and measurements with the standa
42、rd SAE J442 test strip shall be established in accordance with SAE J443. 3.2.3 Test Strip Gage Almen test strip gages used with standard “A“, “C“, and “N“ test strips shall conform to SAE J442 with end stops. Gages of appropriate design in accordance with SAE J442 shall be used for arc height measur
43、ements of subsized strips. 3.2.4 Test Strip Holder Almen test strip holder shall conform to SAE J442. The test strip holder shall be supported on fixtures as required during procedure development or intensity verification in accordance with SAE J443. 3.2.5 Masking Suitable masking shall be applied t
44、o prevent peening in prohibited areas of the part. Baffles may be used to re-direct the media where desired as permitted by the cognizant engineering organization. 3.2.6 Media Size Inspection Equipment 3.2.6.1 A rotating and tapping type of machine in accordance with ASTM B214 shall be used. A mecha
45、nically operated, eccentric sieve shaker shall be used that imparts to the set of sieves a rotary motion and a tapping action of uniform speed. The number of rotations per minute shall be between 270 and 300. The number of taps per minute shall be between 140 and 160. The hold down arm of the sieve
46、shaker shall be fitted with a shock absorbing plug to receive the impact of the tapping device. 3.2.6.2 The testing sieves shall be in accordance with ASTM E11. They shall be of the 8 inch or 200 mm diameter series and of either 1 inch (25 mm) or 2 inches (51 mm) height. SAE INTERNATIONAL AMS2430T P
47、age 7 of 20 3.2.7 Media Shape Inspection Equipment 3.2.7.1 A durable template with a cut-out secured with adhesive tape to retain the media sample or a solid tool with a recess to capture the media sample, or similar method permitted by the cognizant engineering organization shall be used. The cut-o
48、ut or recess shall conform to the sample size dimensional requirements or equivalent area as shown in Table 2A or 2B, as appropriate. Dimensional tolerance shall be within 5 percent. 3.2.7.2 Image magnification equipment shall have the minimum magnification requirements shown in Table 3 and shall have adequate top-lighting to clearly identify, for each media type and size, the requirements in accordance with 3.1.2. Table 3 Magnifier size requirements for inspection of in-proces
