1、 MIL-C-82693A 13 = 9799906 0433632 5 I 25 APRIL 1984 SUPERSEDING 1-c-82693( os) 9 MARCH 1982 AND AMENDMENT 1 1 O JANUARY I983 MILITARY SPECIFICATION Closure Assembly, Aft, For Mk 56 Mod 2 and Mod 3 Rocket Motors This specification is approved for use by the Naval Sea Systems Conmand, Department of t
2、he Navy and is available for use by all Deparbents and Agencies of the Department of Defense 1. SCOPE 1.1 Scope. This specification covers one type of aft closure assembly here- inafter referred to as the closure (see 6.6.1). 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and
3、 standards. Unless otherwise specified, the following specifications and standards of the issue listed in that issue f the Department of Defense Index of Specifications and Standards (DODISS) specified in the solicitation form a part of this specification to the extent specified herein. Specificatio
4、ns Federal (3-M-232 . TT-1-73 5 Standards Military MIL-STD-105 MIL-STD- 129 Methanol (Methyl Alcohol) Isopropyl Alcohol Sampling Procedures and Tables for Inspection by Attributes Marking for Shipment and Storage Beneficial comments (recommendations, additions, deletions) , and pertinent data which
5、may be of use in improving this document, should be addressed to: Commanding Officer, Naval Ordnance Station, Standardization/Documentation Division ( 524) , Indian Head, MD zation Document Improvement Proposal ( DD Form 1426) appearing at the end of this document, oqby letter. . 20640, by using the
6、 self-addressed Standardi- .SC Obtained From GLOBAL ENGINEERING DOCUMENTS 2625 So,Hickory St. Santa Ana, CA 92707 (71 4)540-9870: (8001854-7 179 FSC i338 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-2b73A 13 U 7797706 Oq31b33 7 I I Drawings
7、 I 4 MIL-STD-410 Nondestructive Testing Personnel Qualification and Certification DOD-STD-2101 Classification of Characteristics 2.1.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this specification to the
8、 extent specified herein. Naval Sea Systems Command (Code Ident 53711) 5546252 Closure Assembly, Aft Naval Ordnance Systems Command (Code Ident 10001) 2841603 Shell-Closure, Aft Publications Naval Ordnance Systems Command (Code Ident 10001) WS 4503 Rocket Motor Mark 56 Mod 2 and Mod 3 ( Copies of sp
9、ecifications, standards, drawings, and publications required by manufacturers in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other publications. to the extent specified herein. The following documents
10、 form a part of this specification The issues of the documents which are indicated as DOD adopted shall be the issue listed in the current DODISS and the supplement thereto, if applicable. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D 304-58 Normal Butyl Alcohol (Butanol) ASTM D 494 ASTM
11、D 792 Acetone Extraction of Phenolic Molded or Laminated Products Specific Gravity and Density of Plastics by Displacement ASTM D 2583 Indentation Hardness of Plastics by Means of a Barco1 Impressor ASTM E 114 Ultrasonic Pulse-Echo Straight-Beam Testing by the Contact Method (Application for copies
12、should be addressed to the American Society for TestFng and Materials, 1916 Race Street, Philadelphia, PA 19103. ) 2. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-HIL-C-82b73A 33 777770b 0433634 7 I MIL-C - 8269 3A ( OS ) * NATIONAL MOTOR FREIGH
13、T TRAFFIC ASSOCIATION, INC., AGENT National Motor Freight Classification (Application for copies should be addressed to American Trucking Assoc- Traffic Department, 1616 P Street, Washington, DC iations, Attn: 20036. ) UNIFORM CLASSIFICATION COMMITTEE, AGENT Uniform Freight Classification (Applicati
14、on for copies should be addressed to the Uniform Classification Committee, Room 1107, 222 South Riverside Plaza, Chicago, IL 60606.) (Industry association specifications and standards are generally available They are also distributed among technical groups for reference from libraries. and using Fed
15、eral agencies. ) 2.3 Order of precedence. specification and the references cited herein, the text of this specification shall take precedence. In the event of a conflict between the text of this 3. REQUIREMENTS 3.1 First article. article samples of the closure are required and shall be manufactured
16、using the methods and procedures of the manufacturing process specification (see 3.4.2). The samples shall be tested as specified in 4.4 for the purpose of determining, prior to starting production, that the contractors production methods are capable of producing closures that comply with the techni
17、cal requirements of the contract. 3.2 Classification of characteristics. The characteristics specified herein are classified as critical, major or minor in accordance with DOD-STD-2101. Critical characteristics are identified by the symbol (G) and major characteristics by the symbol (M). the classif
18、ication symbol is the serial number of the characteristic to be verified. drawing characteris tics : Unless otherwise specified in the contract (see 6.2), first All other characteristics are classified minor. The number following The following exception to DOD-STD-2101 applies to classification of W
19、hen the classification applies to only a portion of a note or dimensional characteristic, or there are several classifications applicable, the applicable portions of the note shall be enclosed in brackets in lieu of parentheses, followed by the classification code and serial number. 3.3 Materials. A
20、ll materials and parts shall be in accordance with Dwg 5546252. 3.4 Design and fabrication. accordance with Dwg 5546252 and the following; The closure design and fabrication shall be in 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-2673A 13
21、 9997706 0433635 O I MIL-C-82693( OS) a 3.4.1 Bonding (M101). The find nos. 1 and 3 details of Dwg 5546252 shall be bonded to the primed steel shell (Dwg 2841603) using sufficient adhesive to provide a minimum bonded area of 75% of the area in each of the 1.65 inch cylindrical section and in the 2.9
22、0 inch conical section of the aft closure as defined in FIGURE I. Bondline thickness shall be in accordance with Dwg 5546252. No individual void, unbond or porous area (see 6.6.5) within the above defined conical and cylindrical sections shall exceed 0.5 square inches. circumferentially continuous w
23、ith a width not less than 0.5 inch. The bondline of each cylindrical and conical section shall be 3.4.2 Manufacturing, process specification. Unless otherwise specified in the contract (see 6.2), the contractor shall prepare a manufacturing process specif- ication. fabricating processes and methods
24、of control of manufacturing variables, including proper storage and use of adhesives and primer, bondline thichess control, control of adhesives and primer application, prefitting of parts, cleaning of parts, handling of cleaned parts, control of prepregs, curing of adhesive and primer, etc. (see 6.
25、7). All processing shall be in accordance with the require- ments of the processing specification. i$ The process specification shall fully describe all manufacturing and 3.4.3 Molding. Molding of the molded components (see 6.6.2) shall be at a minimum of 2000 pounds per square inch (psi) plus an ad
26、ditional 500 psi on the molding material per each inch of component height. (no stops) shall be used for first article inspection samples (see 4.4) and all production molding of components. Positive compression molding 3.5 Chemical and physical properties. The chemical and physical properties of com
27、ponents molded in accordance with 3.4.3 shall be as specified in TABLE I. Molded Component -1 TABLE I. Chemical and physical properties. Ac et one Specific Barco1 Extractable, % Gravity, Hardness Maximum Minimum Minimum 0.75 1.72 67 -3 1.00 1 *35 55 3.6 Performance. The closure assembly shall meet t
28、he following requirements after firing with a MK 56 Mod 2 or Mod 3 rocket motor. 3.6.1 Erosion (M102). The throat diameter at the point of maximum restriction shall not exceed 2.92 inches after firing. shall be less than 0.13 inch deep or 0.50 inch wide. ness shall be not less than that specified fo
29、r the poirits indicated in FIGURE 2. Gouges or discontinuously eroded areas The minimum remaining thick- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1- h I MIL-C-82673A 33 M 9999906 O433636 2 I MIL-C-82693A (OS) 5 Provided by IHSNot for ResaleNo
30、reproduction or networking permitted without license from IHS-,-,-MIL-C- 82693 (OS) I following : U 3.6.2 Insulation. The temperature of the external surface of the shell shall be less than 285C (550F) in the conical section and 425C (800“) in the cylindrical section for the initial I50 seconds afte
31、r motor ignition. There shall be no evidence of cracking of any ablative component (see 6.6.4) or motor Lot Acceptance Test (LAT) failure attributable to closure performance, e.g., burnthrough (see 6.6.4) during motor firing when the closure is assembled to a MK 56 rocket motor and tested in accorda
32、nce with 4.7.5. 3.6.3 Component integrity (MIO3). a. No cracks are acceptable. 3.7 Workmanship. The closure assemblies shall be of uniform quality and shall be manufactured in accordance with standard manufacturing procedures of the aero- space industry. Dwgs 5546252 and 2841603 and the following: T
33、he requirements for workmanship shall be as specified in 3.7.1 Metal defects. The closure shell shall be free of cracks, splits, cold shuts, inclusions, porosity or any similar defect. There shall be no burrs which might interfere with the function of the closure or which might be injurious to perso
34、nnel handling the item. ?$ 3.7.2 Molded components. (MI 04). The molded components shall comply with the requirements of 3.7.2.1 and 3.7.2.2. 3.7.2.1 Find No. I insulator. The visible and exposed surfaces (in the case There shall be no inclusions or voids larger than 0.06 X. 0.06 X x of a sectioned
35、component) of the find No. 1 insulator shall be free of cracks and delaminations. 0.125 inch. There shall not be more than 8 inclusions in each molded insulator. ripple surface, shrink-marks, resin voids, surface discoloration, weld-or hit- lines, surface crazing and no more than 50 pits. Inclusions
36、 shall be a minimum of 1.0 inch apart. Acceptable features include -_ 3.7.2.2 Find No. 3 insulator. The visible and exposed surfaces (in the case of a sectioned component) of the find No. 3 insulator shall conform to the b. Voids whose greatest dimension exceeds 0.06 X 0.06 X 0.125 inch are not acce
37、ptable. No more than 15 voids nor more than two (2) surface voids within 4 inches of one another are acceptable. c. Delaminations exceeding 0.75 inch are not acceptable. The total accumulative length of all delaminations in each component shall not exceed 2.25 inches. The minimum distance between an
38、y two delaminations shall not be less than three tines the greatest dimension of the larger delamination. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I i. MIL-C-82693A 13 777770b Oq33638 b I I MIL-C-82693A (OS) 7 Provided by IHSNot for ResaleNo r
39、eproduction or networking permitted without license from IHS-,-,-MIL-C-Zb73A 13 W 7777706 ClLi31637 B I MIL- C - 8 269 3 ( OS d. A maximum of 3 pieces of adhesive scrim is allowable in each component. Those pieces of scrim which are stringlike, less than 0.04 inch nominal diameter, shall not exceed
40、1.13 inches in length. Adhesive scrim chips whose maximum dimension exceeds 0.50 inch are not acceptable. The minimum distance between any two peices of scrim shall not be less than the greatest dimen- sion of the larger piece. e. A maximum of 6 pieces of cured silica-phenolic molding compound is al
41、lowable in each component. Those pieces of molding compound which are stringlike, less than 0.04 inch nominal diameter, shall not exceed 1.13 inches in length. Molding compound chips whose maximum dimension exceeds 0.50 inch are not acceptable. minimum distance between any two pieces of molding comp
42、ound shall not be less than greatest dimension of the larger piece. The f. A maximum of 4 pieces of miscellaneous foreign inclusions including metal is allowable in each component. Wirelike pieces exceeding 0.5 inch in length are not acceptable. (such as chips) whose maximum dimension exceed 0.25 in
43、ch are not acceptable. foreign inclusions shall not be less than the greatest dimension of the larger piece. Other forms of inclusions The minimum distance between any two miscellaneous g. A maximum of 10 dry-spots are allowable on each component providing the maximum dimension of any dry-spot does
44、not exceed 0.20 inch and the maxiam depth of any dry-spot does not exceed 0.015 inch. L Acceptable features include ripple surface, shrink-marks, resin voids, surface discoloration, weld-or knit-lines, surface crazing and no more than 50 pits. 3.7.3 Machined graphite (MI 05) . The machined graphite
45、throat, Dwg 554252, find No. 2, shall be free of cracks, or surface irregularities. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspec- tion requirements as s
46、pecified herein. contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the
47、specification where such inspections are deemed necessary to assure that supplies and services conform to prescribed requirements. Except as otherwise specified in the 4.2 Inspection conditions. Unless otherwise specified (see 6.21, all dimen- sional inspections shall be performed under the followin
48、g conditions: a. Temperature: Room ambient 18 to 35C (65 to 95F) b. Humidity: Room ambient to 95 percent relative, maximum ?,+ 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-82693A 13 979770b 0433640 4 I MIL-C-8269% (OS ) a *ti a rl A- A- h
49、rl P m 8 : h rl P 8 2 o h rl P El o m cd a, -P m .P ! E? O u o -P G O O u G 2 m -9 8 a, E-i a, ; E! O G-l k al pi 5 o O rl u o 5 m O rl u 8 2 O u rl O O c, 2 -P o al FI 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-Zb73A 33 777770b 0433643 b I MIL- C- 82 693A (Os ) n 4.3 Classification of inspection. The inspection requir
