ARMY MIL-P-60620 D (1)-1994 PROJECTILE ASSEMBLY FOR CARTRIDGE SMOKE WP 81MM M375A1《M375A1式81 mm白磷烟幕弹(WP)弹夹的组装》.pdf

1、I INCH-POUND I MIL-P-6062OD (AR) AMENDMENT 1 23 August 1994 MILITARY SPECIFICATION PROJECTILE ASSEMBLY FOR CARTRIDGE, SMOKE, WP, 81MM, M375A1 This Amendment forms a part of MIL-P-60620D (AR), dated 9 August 1985, and is approved for use by the U.S. Army Armament, Munitions and Chemical Command, and

2、is available for use by all Departments and Agencies of the Department of Defense. PAGE 1 2.1. I, SPEClL.lCAI10NS, Add : “FEDERAL TT-C- 490 Cleaning Methods and Pre treatment of Ferrous Surfaces for Organic Coatings.“ PAGE 4 3.6, Delete in its entirety and substitute: “3.6 Proving ground (maximum av

3、erage pressure) test. Projectile bodies shall reveal no evidence of failure when tested at maximum average pressure in accordance with 4.5.6.“ PAGE 5 Add new paragraph 3.9 as follows: “3.9 Hydrostatic test (one-piece projectile). Each one- piece projccti le shall withstand stresses developed by the

4、application of 7000 + 250 psi internal hydrostatic pressure for five seconds without leakage, rupture, or permanent deformation when tested in accordance with 4.5.2.1.“ 1 of 10 AMSC N/A DISTRIBUTION STATEMENT A. FSC 1315 Approved for public release; distribution is unlimited. Provided by IHSNot for

5、ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-60620D 9AR) AMENDMENT 1 PAGE 5 (cont) 4.3.1, List of components submitted for first article, Add: “Body, prior to machining obturator groove . 10535864 . 10“. PAGE 6 TABLE 1, Add Category IV as follows: 81y, .g.rior to-

6、machininq obturating band qroove (Dwg. 10535864) a. Examination for defects . 10 . 100% . 3.2 . 4.4.2.2/4.4.2.3/4.4.2.4 b. Hydrotest . 10 . 100% . 3.9 . 4.5.2.1“. PAGE 7 4.4.2, Add the following at the end of the paragraph: “Dimensions marked tool control (*) shall be gaged during first article insp

7、ection, at the beginning of each workday, every four (4) hours during production, for the last component prior to and first component after each tooling, equipment, or process change, repair or adjustment. Measurements of the tool may be substituted provided the contractor has established correlatio

8、n between the tool dimension and the component dimension prior to substitution. determined, inspection of tool dimensions will be permitted. Whenever a defective tool control dimension is found, immediate action will be taken by the contractor to correct the tool problem and all material produced si

9、nce the last successful inspection shall be rejected.“ . When acceptability has been PAGE 8 4.4.2.1, Majors, Add: “103 Forward inside diameter . 0.40% . 3.2 . Gage 104 Wall thickqess, minimum, through shoulder . 0.40% . 3.2 . Gage . . .Gagegi 105 Length from rear face to base of cavity . 0.40% . 3.2

10、 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-60620D 9AR) AMENDMENT 1 PAGE 9 4.4.2.2, Title block, Add : trBodyl. Drawing Number block, Add: 181053586411. Notes, Add: Il/ - Minor characteristics do not apply to 1053586411. Critical, Add: “

11、4 . . .Hydrotest . . .loo% . . .3.9 . . .4.5.2.lV1. Critical 2, delete in its entirety and substitute: “2 . press fit surface increases in diameter anywhere from front face to WP cavity . 100% . 3.2 . Gage.“ PAGE 10 4.4.2.3. Critical 1, Delete in its entirety and substitute: “1. Hydrotest . 1/ . 100

12、% . 3.4.1 . 4.5.2“. Critical 2, Delete in its entirety and substitute: “2. Air leak test . I/ . 100% . 3.4.2 . 4.5.3“. Criticals 3, 4 and 5, Delete in their entirety. Specials, Add: lia. Metal defects . 100% . 3.2 . Visual b. Hydrostatic test stamp missing . 100% . 3.2 . Visual C. Air pressure test

13、stamp missing . 1/ . 100% . 3.2 d. k3raze metal not visible for 360 degrees, internal and e. t3rdzt riic.I.al voids in excess of requirements (external ) f. Presence of void(s) at juncture of base and body wall Y- Joirit quality inadequate .I /, z/ . 100% . 3.4.3 . . .Visual external . . .i/ . . -10

14、0% . . -3.4 . . .Visual .1 / . 100% . 3.4 . Visual (internal) . )-/ . 100% . 3.4 . Visual . . -4.5. a/Visual“. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-bOb20D (1) 9999906 L992904 3LT ! MIL-P-606200 9AH) AMENDMENT 1 PAGE 10 (cont) Notes

15、, Add: “1/ Alternative body assembly only 2/ See 4.4.3.4“. PAGE Il 4.4.2.3, Majors 110, 111, and 112 No. of Sample Units column, Add: Il/“. Notes, Add: “I/ See 10535866 for this feature on Body Alternative I.“ Majors, Add: II 13.0 Diariictcr of- bourrelet . . .0.40% . . .3.2 . . .Gage“. PAGE 12 J 4.

16、4.2.3, Majors 113, 114, 120, and Minors 201, 202, 203, 204 No. of Saarriple Units column, Add: Il/“. Majors Il5 arid 116 No. 01- SarripIc Urii ts colurriri, Add: “2/“. Notes, Add: - “1/ See 10535866 for this feature on Body Alternative I 2/ Applies tio 10535864 only“. 4 Provided by IHSNot for Resale

17、No reproduction or networking permitted without license from IHS-,-,-MIL-P-60620D 9AR) AMENDMENT 1 PAGE 13 4.4.2.3, Minors 210 No. of Sample Units column, Add: iil/ii. - 211 Delete: “VisualI1, and substitute: Gagef1. 218 Delete in its entirety and add: “219 Depth of drill point in thread boss, maxim

18、um . 0.65% - . -3.2 . . .Gageii. 220 Diameter of drill point at rear face of thread boss . . .O. 65% . . .3.2 . . .Gage“. Notes, Add: Il/ See 10535866 for this feature on Body Alternative I.“ PAGE 14 4.4.2.3, Add: “Special a . Major diameter of thread, min - 100% . 3.2 . . .Gage“. Major 102, delete

19、in its entirety. Major 104, No. of Sample Units column, Add: lll/tl. Majors, Add: “Ill Salt spray test . 21 . - . 3.5 . 4.5.5/Visual 112 Max average pressure test . . .3/ . . .- . . -3.6 . . .4.5.6/Visual“. Notes, Add Ill/ Major diameter shall be checked to full form minimum lerigt h 2/ See 4.5.5 31

20、 See 4.4.4“. PAGE 17 4.4.3.2, Delete iri its entirety. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-bObZOD (1) MIL-P-60620D 9AR) AMENDMENT 1 PAGE 18 4.4.3.4, Delete in its entirety and substitute: “4.4.3.4 Joint quality (alternative body a

21、ssembly). lhc test shall be performed for first article inspection each day of brazing during production and whenever a change is made to the brazing process. After air and hydrostatic testing, but prior to the application of protective coating, three (3) samples from the start of brazing operations

22、 and from the first units produced after a layoff of over one (1) hour shall be tested. Iwo (2) samples shall be selected, each from the end of brazirig operations during continuous brazing, up to 24 hours arid from the last. units produced prior to a layoff of over one hour and tested in accordance

23、 with 4.5.4. If a failure occurs in either of the two (2) samples tested at the end of the days brazing operations or at the start of layoff-, all parts brazed since the last successful test shall be rejected.“ 4.4.3.5, Delete in its entirety. 4.4.4, Delete iri its entirety and substitulc: “4.4.4 Pr

24、oving ground (maximum average pressure) test. See 4.5.6. iwerity five (25) projectiles shall be tested from the first article sample and ten (10) from each of the first three (3) production lots and from three (3) consecutive lots when a new mill heat of steel is introduced into production. &i attem

25、pt will be riiade to recover at least 60 percent of the projectiles fired in each test. If a round falls short due to an undetermined cause and is not recovered, it shall be classed defective. Defect classification and individual accept/reject criteria shall be in accordance with Table TI. Table II

26、- Proving Ground Test Category Accept/Rej ect Defect Critical Premature burst, metal part breakup or deformation due to launch forces O 1 Major Horizontal range less than 80% of average range O 1 I . 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-

27、MIL-P-bOb20D (II) m 9999906 II992907 O29 = MIL-P-60620D 9AR) AMENDMENT 1 PAGE 19 Add new paragraph 4.5.2.1 as follows: “4.5.2.1 One piece hydrotest. After the wall thickness is ir1 coIif-ormance with final size, but prior to machining the obturating band groove, each one-piece projectile shall be su

28、bjected to an internal hydrotest to determine compliance with the requirements of 3.9. A temporary internal thread shall be machined in the forward end of the body to couple the body to the hydrostatic test fixture. Only the threads and front face of the projectile body may be in contact with the te

29、st fixtiire. After the required minimum pressure is met or exceeded, the pressure shall be held for five (5) seconds, minimum. Projectile rupture, cracking leakage or bulging during the test shall be cause for rejection of the body. if more than one projectile is tested simultaneously on a manifold

30、and one projectile fails the test, it shall be replaced with a bew body. All other projectiles attached to the mariif-old at that time shall be retested with the new body until all simultaneously meet the time and pressure reqii i r crrierits . irruriediate1.y after removal from the hydrotest equipm

31、ent, each prol ec- t i 1 e Lha t tias passed the hj ydrotest shall be stamped Il.“ i/8 irich high by .O1 inch deep approximately 1/8 inch below the locatiori of the zorie used for the lot number. ihe equiprrient shall be calibrated prior to the start of each days operation and at intervals of not ov

32、er four (4) hours of continuous operation. it shall aso be calibrated prior to restarting the operation after a layoff of- three hours or more. If it has been found that the equipment is out of calibration in such a direction that the pressure was actually lower than required by the test, the bodies

33、 tested since the last satisfactory calibration shall be retested after the calibration error has been corrected. Protective barriers should be installed where applicable to shield operators and material from metal fragments which may corne from defective projectiles that fail the test. Exariiiriat

34、ion should be made of all hydrotest plugs after a projectile is blowri during testing. Badly nicked or damaged plugs may cause destruction of acceptable items. The protective barrier must allow sufficient clearance for a def-cctive projec-tilc to completely fail iri any direction.“ 7 Provided by IHS

35、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-P-bOb20D (1) 999990b 1992908 Tb5 MIL-P-60620D 9AR) AMENDMENT 1 PAGE 20 4.5.5, Delete in its entirety and substitute: “4.5.5 Salt sDray test. In performing the following tests, TT-C-490 shall apply unless specifie

36、d otherwise, herein. The test shall be performed for first article inspection, each day of painting during production and whenever a change is made to the paint process, until all samples from five (5) consecutive days of painting have passed the test. Thereafter, the sample frequency may be reduced

37、 to twice per week during continuous days of painting. Five specimens shall be selected, consisting of randomly chosen projectiles which have been processed through all the same cleaning, phosphating, painting and drying steps, at the same time using the same equipment as other production projectile

38、s. The samples shall be taken from each continuous final paint operation, up to 24 hours long. One projectile shall be taken during the first thirty (30) minutes of painting, one during the last thirty (30) minutes, and the others at any other time. Prior to salt spray testing, two (2) of the specim

39、ens must only pass an adhesion test using the procedures and pass-fail criteria contained in 4.2.8 and 3.5.6, respectively, of TT-C- 490. If both specimens pass the adhesion test, the three (3) remaining specimens shall be scored lengthwise using a the salt spray test. precision scribing tool/insert

40、 or equivalent in preparation for The salt solution, test equipment, and drying procedures shall be in accordancewith ASTM B117, Salt Spray (Fog) Testing, unless specified otherwise, herein. Specimens shall be positioned between 15 and 3b degrees from vertical during the test. No coating of any kind

41、 shall be permitted over the paint on stamp marks of the specimens prior to testing. However, areas in contact with racks or supports, unpainted surfaces and areas within 3/16 inch of unpainted surfaces may be protected. When examining the specimens for signs of apaint failure, the entire surface of

42、 the projectile shall be considered the significant surface. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-P-60620D 9AR) AMENDMENT 1 PAGE 20 (cont) As used herein, the term “blister“ refers to an unbroken area of paint with a bubble-like ap

43、pearance, whereas lpits“ or “spots1 are exposed phosphate pretreatment or bare metal visible through holes in the paint. Blisters which are present when the test is over are to be counted within five .(5) minutes of removal from the test chamber. Projectiles shall be tested for the duration specifie

44、d on drawing 10522511. After testing, any projectile which fails for any of the following reasons shall cause rejection of all parts painted since the last successful test and a return to the original sampling plan if failure occurred during reduced sampling. The failure criteria a - i apply to the

45、significant surface only. a. The paint shows more than 1/8 inch creepage, blistering or loss of adhesion of paint from the scribe mark, stamp mark, or edge. b. There are more than eight (8) blisters, total. c. Any blister exceeds 1/16 inch average diameter. d. Any pit exceeds 1/8 inch average diamet

46、er. e. There are four (4) or more scattered pits exceeding 1/16 inch average diameter. f. There are four (4) or more spots within one square inch. g. There are three (3) spots within one square inch in two (2) or more places. h. There are more than six (6) scattered spots, total i. There is evidence

47、 of rust under the paint (a brown discoloration showing through the paint) in excess of 1/4 inch in diameter total area. j. There is some var,iation o.f the above or an unlisted defect anywhere which the government representative deems excessive. 9 Provided by IHSNot for ResaleNo reproduction or net

48、working permitted without license from IHS-,-,-MIL-P-bOb20D (1) 9999906 1992910 b13 MIL-P-60620D 9A) AMENDMENT 1 PAGE 20 (cont) 4.5.6, Delete in its entirety and substitute: “4.5.6 Proving-around (maximum averaae Dressure) test. The samples supplied in accordance with 4.4.4, inert loaded to the serv

49、ice weight and dummy fuzed, will be assembled into complete rounds and fired for recovery from a mortar for which the round is standard, the tube of which will have a minimum of 25 percent life remaining based on current mortar tube condemnation criteria. to produce 10,028 - 10,396 psi with cartridges conditioned at 70 degrees F. proving ground in accordance with applicable