ARMY MIL-C-47246 A-1990 COATINGS ABLATIVE APPLICATION OF《烧蚀涂层应用》.pdf

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1、MIL-C-47269A 999990b 1490938 3Y2 pEiGl MIL-C*47269A (MI) 14 December 1992 SUPERSEDING MIL-C-47269 (MI) 9 August 1974 MILITARY SPECIFICATION CASTINGS, INSPECTION OF (FOR GUIDED MISSILE AND ROCKET MATERIEL) This specification is approved for use by the U.S. Army Missile Command, Department of the Army

2、, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification establishes standards of soundness and freedom from defects for metal castings used in guided missile and rocket materiel and prescribes the requirements for inspection of

3、castings to determine their conformance to such standards. 1.2 Classification. The classification of castings for purposes of inspection hereunder shall be as specified on the design drawing for the castings in accordance with the classifications established in MIL-STD-2175. Beneficial comments (rec

4、ommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, U.S. Army Missile Command, ATTN: AMSMI-RD-SE-TD-ST, Redstone Arsenal, AL 35898-5270 by using the Standardization Document Improvement Proposal (DD Form 1426) a

5、ppearing at the end of this document or by letter. AMSC N/A FSC 1420 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-472bqA 99999Ob LV90939 289 MIL-C-4 72 6 9A (M

6、I ) 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the

7、issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). STANDARS MILITARY MIL-STD-1949 - Inspection, Magnetic Particle MIL-STD-2175 - Castings, Classification and MIL-STD-6866 - Inspection, Liquid Penetrant. Inspe

8、ction of (Unless otherwise indicated, copies of the federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Ave., Philadelphia, PA 19111-5094.) form a partsaf this document to the extent specified herein. Unless

9、 otherwise-specified, the issues of the documents which are DQD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents 2.2 Non-Government publications. The following d

10、ocuments ,“ cited in the solicitation (see 6.2). . AMERICAN SOCIETY FOR TESTING MATERIALS (ASTM) ASTM E 155 - Inspection of Aluminum and Magnesium Castings, Standard Reference Radiographs for (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Str

11、eet, Philadelphia, PA 19103.) (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-47269A = 9999906 1490940 TTO I MIL-C-4

12、 72 6 9A (MI ) documents. These documents also may be available in or through libraries or other informational services.) 2.3 Order of Precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this

13、 document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Basic requirement. Inspection of castings shall be in accordance with the requirements of MIL-STD-2175 for the applicable _ class and as required herein. 3.2 Standards. S

14、tandards of soundness and freedom from defects which apply for the various areas of a casting shall be as specified on the drawing (see 6.2 and 6.3). These standards shall be used to determine acceptability in accordance with tables I, II and III of this specification. When no standard is specified

15、on the drawing, standard II hereof shall apply. When no standard is specified but the drawing does designate the “critical“ areas of a casting, standard II shall apply for the areas so designated, and standard III shall apply for the remainder of the casting. 3.3 Visual inspection. 3.3.1 Gas holes a

16、nd dross. Maximum acceptable sizes and spacing of vlsually detected gas holes and dross in the surface of a finished casting shall be as established in table I. Except for Class IIB castings reworked as specified below, defects in excess of those specified in table I shall be cause for rejection. 3.

17、4 Magnetic and penetrant inspection. All castings of ferromagnetic materials shall be inspected in accordance with MIL- STD-1949. All castings of nonferromagnetic materials shall be penetrant inspected in accordance with MIL-STD-6866. Penetrant inspection of aluminum alloy castings which are to be p

18、rotected by anodic or other chemical film shall be performed before such anodic or chemical process, and shall not be required after the parts are so treated. For castings of all classes, magnetic and penetrant inspection shall be for the purpose of detecting and evaluating cracks and cold shuts onl

19、y. For Class 1A and Class IIA castings, the disposition of other defects shall be as determined by the results of radiographic inspection. For all classes of castings, 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-47269A 999990b 1490941 937

20、 MIL-C-47269A (MI) gas holes and dross exposed on the surface are acceptable if within the limits established in table I. 3.5 Radiographic inspection. Radiographs of casting shall be prepared in accordance with the requirements of MIL-STD-2175 and any applicable radiographic positioning chart. alumi

21、num alloy and magnesium alloy castings, when such are required, shall be compared with the applicable reference radiograph of ASTM E 155 as established in tables II and III respectively (see 6.4). Any defect in excess of those allowed in table II or table III for the particular standard shall be cau

22、se for rejection, except that such defect may be accepted in a raw casting if subsequent machining will completely remove the defect. Radiographs of 4 c 1, a f O Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-._ . MIL-C-47269A 999990b 1490942 873 MI

23、L-C- 47 2 69A (MI) H I nnn I OCDW I+ c 4 III I I lm I I lcr) o) O O c al HE HHO HHHC noe alou na o Li4 snal au n go 3 alo P4 a cd 3 -4 4 dW al ao coa nuw u Lie7 04 n moc 7 -4 4 04 3 ao c ac, 44 uc curl o 0.Q oca oc, *. -4 o a aW o 4 aal asuw aluo0 Lie 40 “2 R Baria, u 8 (da gu *- N E2 5: a4 al (li 4

24、 o4 o4 corlu3 w an o Li an4 sarlrl c o “2 m ai n ac -4 4 o ci WI u8 8; IZ O0 E4 u eu na r. tal o *(Li ual 44 u0 ou n C Li0 e -4 on 4c on Eu =rl VI P o n -4 0 c Li -4 als 34 o 4c e -4 3c u 22 b -4 ri3 b- ea wale al 34 Wal o Li P -4 on 44 2u 01 c 8s 4d 32 ala uc c all EI 31 nc c,o o -4 eu w4 8% z F c

25、-4 Lie 00 Pu -4 n al -d Co oal 3P a 0-4 Li4 e OP the radiographic positioning chart, whichever is appiicable. 6.3.2 Standard I. Standard I is primarily intended for highly stressed areas or pressure tightness, Special process control is usually required to meet this standard. 6.3.3 Standard II. Stan

26、dard II is primarily intended for parts subject to medium stress where better than average quality is required. 6.3.4 Standard III. Standard III is primarily intended for other parts subject to low stressed areas of other castings. 6.4 Metrication. Metric equivalents in accordance with FED-STD-376 a

27、re acceptable for use in this specification. 6.5 Subject term (keyword) listing. Radiographic inspection Radiographic standards Radiography 6.6 Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extensiveness of the changes. Custodian: Army - MI Preparing Activity Army - MI Project No. 1420-A303 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-