1、r4 c J INCH-POUND MIL-P-70506A (AR) AMENDMENT 2 O2 Auqust 1993 SUPERSEDING AMENDMENT 1 3 April 1989 MILITARY SPECIFICATION PROJECTILE, 155mm: XM864 BASE BURNER ASSEMBLY LOADING, ASSEMBLING AND PACKING This Amendment forms a part of Military Specification MIL-P- 70506A (AR) dated 4 April 1988, and is
2、 approved for use within the U.S. Army Armament, Munitions and Chemical Command and is available for use by all Departments and Agencies of the Department of Defense. PAGE 1 Change XM864 to “M864“ wherever it appears in the specification. PAGE 3 Add the following new paragraphs as follows: “2.2 Non-
3、Government publications. The following document(s) form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless other- wise specified, the issue
4、s of the documents not listed in the DODISS are the issues of the documents cited in the solicita- tion (see 6.2). AMERICAN NATIONAL STANDARDS INSTITUTE ANSI Zl.1 - Guide for Quality Control Charts ANSI 21.2 - Control Chart Method of Analyzing Data ANSI 21.3 - Control Chart Method of Controlling Qua
5、lity During Production (Applications for copies should be addressed to American National Standards Institute, 1430 Broadway, N.Y., N.Y. 10018) AMSMC N/A 1 of 16 FSC 1320 DISTRIBUTION STATEMENT A. Approved for public release; distirbution is unlimited. Licensed by Information Handling ServicesMIL-P-7
6、050bA (2) = 9999906 L95LL47 968 . MIL-P-70506A (AR) AMENDMENT 2 2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited herein (except for related associated detail specifications, specification sheets, or MS standards), the text of this docu- m
7、ent takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.“ * 3.2.1.1, line 4, Delete: “.441“ and substitute: “.514“. 3.3.1 Change the paragraph to read as follows: “3.3.1 Loose imiter composition. After consolid
8、ation there shall be no visual evidence of loose igniter composi- tion. I * 3.3.2 Delete “1450+/-50“ and substitute “1150+/-50“. PAGE 5 * 3.8 Add new sentence to beginning of paragraph: “The requirements for the workmanship are as specified on the applicable drawings and referenced specifications.“
9、Delete the second sentence and substitute the following: “They shall be free of burrs, sharp edges, cracks, gouges, cuts, dirt, grease, rust, and other foreign matter, unless defined elsewhere in this specification.“ 3.8.1 Change title to read: “3.8.1 Tracer CUDS. 3.8.2 Change the paragraph to read:
10、 “3.8.2 Imiter CUD, loadina assembly. The stepped area of the finished igniter cup need not be perfect form. Damaged areas up to 25 percent of the total surface area are allowed. Damage in excess of 25 percent is cause for rejection.“ Add the following new paragraphs: “3.9 Weather seal assembly. The
11、 weather seal assembly shall not allow moisture to leak into the base burner as- sembly. 2 Licensed by Information Handling ServicesMIL-P-7050bA (2) 9999906 L95LL48 T4 w MIL-P-70506A (AR) AMENDMENT 2 3.9.1 Weather seal resistance to air pressure. The weather seal assembly shall withstand an air pres
12、sure test of 15 psi for 15 seconds. O 3.9.2 Weather seal shelf life in storaqe. The shelf life for production weather seals in storage shall be a minimum of one year from the date of their production. 3.9.3 Weather seal deqradation. Prior to their use, if it is detected by the base burner manufactur
13、er that a shipment of weather seal assemblies or parts thereof has been contaminated due to exposure to a foreign substance or by the degradation of the packaging assembly, those weather seal assemblies will be rejected and will not be permitted for use. NOTE: A foreign substance is considered to be
14、 any unknown substance; ie. liquid, powder, gel, residue, etc. that does not conform to the provisions of the weather seal assembly drawing, or visually compare in quality , or physical condi- tion to prior shipments. PAGE 7 4.3.1.1 Examination or test, delete: I Iqniter (Dwg. 12630572)“ and substit
15、ute: “Ianiter CUP, Loadinq Assembly (Dwg. 12630572)“ PAGE 9 4.4.1 Add the following requirement: If. Weather seal assemblies from one lot from one manufac- turer. Add the following new paragraph: “4.4.1.1 Weather seal assembly raw materials. The raw materials sued in the construction of the M864 w4e
16、ather seal assembly will be subject to the following requirements: a. Aluminum from one lot from one b. Polyvinyl fluoride (disc seal) manufacturer. c. Adhesive from one lot from one 3 manufacturer. from one lot from one manufacturer. Licensed by Information Handling ServicesMIL-P-7050bA (2) U 99994
17、0b 1951349 730 U _- MIL-P-70506A (AR) AMENDMENT 2 PAGE 9 * 4.4.1 Add “g. Igniter housing plugs from one lot interfix number from one manufacturer.“ PAGE 10 4.4.2 Add the following new paragraph: “4.4.2.c Statistical process control (SPC). For those dimensions identified in the Classification of Defe
18、cts Tables by the reference “(see Appendix A)“, the contractor must util- ize the principles of SPC as defined herein, ANSI 21.1, ANSI 21.2, ANSI 21.3, and in Appendix A. When the contractor satisfies the control conditions identified in appendix A, ac- ceptance will then be by SPC. The SPC sample s
19、ize and frequency of selection shall be determined by the contractor. If the SPC sample is to be less than 4 items per hour, then the approval of the procuring agency must be sought prior to the elimination of sampling inspection for acceptance. The contractor may request to implement SPC acceptance
20、 for any other feature that is not annotated in the classification for defects by requesting approval of the procurement agency and by meeting all the conditions specified in this specification. When not accepting product by SPC, acceptance of product for those features identified with references to
21、 appendix A will only be in accordance with MIL-STD-414 or MIL-STD-1235 plans CSP-1, -2, -T using variable measurement capable gages.“ PAGE 11 4.4.2.2 Change critical defect to read: “Critic a 1 Evidence of loose igniter composition 100% 3.3.1 Visual/ Note 2“ Add “(see Appendix A)“ after major defec
22、ts 105, 106 and 107. Change note 1 to read: “1. Damaged or missing cadmium plating is permissible on tracer cup provided that the base metal is not gouged or cracked. Flakes of cadmium plating on surface of igniter material is permissible.“ Add to the bottom of paragraph 4.4.2.2 under Notes: * “2. A
23、s a referee test for possible loose igniter composition, refer to paragraph 6.8.“ 4 Licensed by Information Handling ServicesMIL-P-7050bA (2) m 999990b L95LL50 q52 MIL-P-70506A (AR) AMENDMENT 2 PAGE 12 4.4.2.3 Make the following changes: Delete Major 101 in its entirety. Delete Major 102 and substit
24、ute the following: “Major 101 Plug missing 100% 3.1 Visual“ Add : “Special a Igniter cup missing or incorrectly oriented (Note 1) 100% 3.1 Visual“ PAGE 13 4.4.2.4 Delete Major 102 in its entirety. Add the following: “Special a Igniter cup missing or incorrectly oriented (Note 1) 100% 3.1 Visual“ PAG
25、E 15 * 4.4.2.4 Change drawing “12561476“ to “12561471“. PAGE 17 * 4.4.2.8, Category, Major 101, Delete: “or punctured Major 102, Delete in its entirety and Substitute: “102 Interior seal perforation missing or improperly located 100% 3.1 Visual“ Major 104, Delete in its entirety. PAGE 18 * 4.4.2.9,
26、Special category, Delete special defect d. in its entirety and replace with: Spec i a 1 d Presence of sealant around weather seal base closure interface, 360 degrees 100% 3.1 Visual“ 5 Licensed by Information Handling ServicesMIL-P-7050bA (2) q99940b 1951151 399 MIL-P-70506A (AR) AMENDMENT 2 Major c
27、ategory, Add: “103 Interior seal perforation not covered with sealant 0.40% 3.1 Visual 104 Exterior weather seal missing or punctured 100% 3.1 Visual 105 Exterior weather seal improperly positioned 0.40% 3.1 Gage“ Delete minors 201, 202, 203 in their entirety and substitute the following: “Minor 201
28、 M864 BASE BURNER ASSEMBLY notation and lot number missing, misleading or unidentifiable .65% 3.1 Visual 202 Propelling grain batch number missing, or unidentifiable .65% 3.1 Visual 203 Evidence of poor workmanship .65% 3.8 Visual * 4.4.2.10 Add new paragraph (attached) 6 Licensed by Information Han
29、dling Servicest- u) u1 t U O z I- 0 a z 2 Lu 44cO MMM . a Cu C -4 cci a, a a, C a, 4 A -4 tri a, ri ri -4 k oa 4-fi Om OC ka kE 02 Ok CO -4 3 a a, -k 24 DO uco -4 a-fi a a am a, mcci C h-4 o -4 -lE (4-4 .k a, a, a, mu a ac c 0-4 a, a, kAa c a k -4 7 (18a) Licensed by Information Handling ServicesMIL
30、-P-7050bA (2) 9999906 L95LL53 LbL . MIL-P-70506A (AR) AMENDMENT 2 PAGE 19 * Delete 5.2.1 in its entirety and substitute the following: “5.2.1 Domestic Shipments. Packaging, packing, and marking of the base assembly shall be in accordance with 12561471. PAGE 20 * 4.5.2 Delete in its entirety and subs
31、titute the following: “4.5.2 Heat of explosion, igniter composition. The igniter material shall be tested for heat of explosion (combustion) in a closed bomb calorimeter in accordance with 4.5.11. Two (2) 3 gram samples shall be taken from each batch of igniter com- position produced. If both sample
32、s fail to yield a calorie per gram value in the specified range, (see 3.3.2) reject the material batch. If one sample fails, take a second double sample. If one or both samples fail from the second double sample, then reject the batch. Accept a batch only when both samples of a double sample fall wi
33、thin the specified range.“ Atmospheres inert gas)“ * 4.5.4 Delete I( 25 Atmospheres Nitrogen) I and substitute I (25 PAGE 22 * 4.5.8, line 7, Delete: IM557 point detonating fuze“ and Substitute: “M577/M577A1 fuze set for point detonation“ PAGE 23 * 4.5.8, line 3, after “3.2.*, Add: “If any lot fails
34、 to meet the RPE requirement of 3.2.1.1 (as calculated per 4.5.8.3), the lot shall be referred to the technical agency for disposi- tion. PAGE 24 * 4.5.10 Add the following new paragraph: PARR OXYGEN BOMB ADIABATIC CALORIMETER “4.5.10 HEAT OF EXPLOSION OF IGNITER COMPOSITION USING THE a. PRINCIPLE A
35、ND STATUS The heat of explosion of igniter composition material is determined by ignition of a known mass in an argon atmosphere in a Parr Adiabatic Calorimeter. 8 Licensed by Information Handling ServicesMIL-P-7050bA (2) m 999990b 195115Li OT8 m MIL-P-70506A (AR) AMENDMENT 2 b. APPARATUS AND REAGEN
36、TS 1. Calorimeter, Parr Oxygen Bomb, Adiabatic, Automatic 2. Balance, Analytical, 0.1 mg. 3. Balance, Torsion, O.lg, 4kg. capacity 4. Scissors 5. Wash bottle 6. Water heater 7. Water cooler 8. Argon gas 9. Water, distilled c. 1. Preliminary Determine the- water equivalent factor of the calorimeter.
37、2. Sample size and Bomb Pressure Sample Size mo (2) 3 gram samples of igniter composition from each batch e Bomb Pressure 25 atm of inert gas (Argon) d. PROCEDURE 1. Fill the calorimeter bucket by first taring the dry bucket on a solution or trip balance; then add 2000 (+/- 0.5) grams of water. Dist
38、illed water is preferred, but demineral- ized or tap water containing less than 250 ppm of dissolved solids is satisfactory. The water temperature should be ap- proximately 1.5 C below room temperature, but this can be varied to suit the operators preference. It is not necessary to use exactly 2000
39、grams, but the amount selected must be duplicated within +/- 0.5 gram for each run. 2. Closing the bomb. Care must be taken not to disturb the sample when moving the bomb head from the support stand to the bomb cylinder. above the sealing ring and that the sealing ring is in good condition; then sli
40、de the head into the cylinder and push it down as far as it will go. It will be convenient (but not essential) to hold the bomb in a bench clamp during the clos- ing and while filling the bomb with argon. Set the screw cap on the cylinder and turn it down firmly by hand. Do not use a Be sure that th
41、e contact ring is in place - wrench or spanner on the cap. Hand tightening should be suf- ficient to secure a tight seal. e 9 Licensed by Information Handling ServicesMIL-P-70506A (AR) AMENDMENT 2 3. Filling the bomb. Press the fitting on the end of the hose into the inlet valve socket and turn the
42、knurled union nut finger tight. Close the valve on the filling connection; then open or “crack“ the argon tank valve not more than one- quarter turn. Open the connection control valve slowly and watch the gage as the bomb pressure rises to the desired fill- ing pressure (usually 30 atm., but never m
43、ore than 40 atm.); then close the control valve. The bomb inlet check valve will close automatically when the supply is off, leaving the bomb filled to the highest pressure indicated on the atm. gage. Fill the bomb to 30 atm. and exhaust a total of 3 times before filling to the appropriate pressure
44、for the particular sample being tested. When testing a powder or granular material, the filling and purging operation must be done very slowly so the sample will not be disturbed. Release the residual pressure in the filling hose by pushing downward on the lever attached to the release valve. The ga
45、ge should now return to zero. If the pressure drops slowly and a large amount of gas escapes when the pressure relief valve is opened, the check valve in the bomb head is not operating properly. This trouble will have to be corrected before the bomb can be used. If too much should accidentally be in
46、troduced into the bomb, do not proceed with the combustion. Detach the filling connection; exhaust the bomb; remove the head and reweigh the sample before repeating the filling operation. handle to the two holes in the side of the screw cap and lower the bomb into the water with its feet spanning th
47、e circular boss in the bottom of the bucket. Handle the bomb carefully during this operation so that the sample will not be dis- turbed. Remove the handle and shake away any drops of water back into the bucket; then push the two ignition lead wires into the terminal sockets on the bomb head, being c
48、areful not to remove any water from the bucket with the fingers. 4. Set the bucket in the calorimeter; attach the lifting 5. Close the calorimeter cover; lower the thermometer bracket; adjust the reading lens and turn on the power switch to start the motor. 6. Let the calorimeter run for 7 minutes w
49、hile the con- troller brings the jacket temperature up to equilibrium with the bucket. After the temperatures have equalized, vibrate the thermometer and read the bucket temperature to one-tenth of the smallest scale division. 7. Stand back from the calorimeter and fire the bomb by pressing the ignition button and holding it down until the in- dicator light goes out. Normally the light will glow for only about 1/2 second, but release the button with 5 seconds regardless of the light. 10 Licensed by Information Handling Servicesc MIL-P-7050bA (2) 40b L51L5b 970 MIL-P-7
