1、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-45455E 13 777770b 0307258 L MIL-P-45455E (AR) DRAWINGS (see 6.9) US ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND 8837902 - Projectile, 175MM, HE, M437A1 and M437A2, for 8857344 - Pallet for Proj
2、ectile, 175MM 175MM Gun Ml13 3. REQUIREMENTS 3.1 Materials. Materials and parts shall be in accordance with 3.1.1 Comp B - Clean explosive scrap. the applicable drawings and specifications. blended with virgin explosive only in an amount such that the 1.3% maximum desensitizer wax content will not b
3、e exceeded for the melt (see 4.5.5). Clean scrap produced in regular operations may be reused provided that it complies with the requirements for the grade of high explosive specified except for form. Scrap from floor sweepings, ventilation, and suction apparatus (other than from drilling operations
4、 specifically controlled to prevent contamination o? explosives) shall not be used (see 6.5). 3.2 Assembled projectile. The assembled projectile shall comply with all requirements specified on Drawing (dwg) 8837902, and with all requirements specified in the applicable specifications. Riser scrap sh
5、all be 3.3 Cavitation in high explosive charge 3.3.1 Cracks and projected cavities. Cracks and cavities within the explosive charge shall not exceed the requirements specified in Table I when determined in accordance with 4.5.1.1. Cavities having a maximum (max) projected length of 1/32 inch (in.) o
6、r less shall be disregarded. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-45455E 13 797970b 0307260 T MIL-P-4 54 55E (AR) max. dimension of
7、 any visible cavity in the faced surface of the charge shall not exceed 1/4 inch in any direction and the total area of all cavities shall not exceed 80 percent of the surface area. No individual point of explosive shall extend above the flat surface on which the liner would rest. (Cavities having a
8、 maximum dimension of 1/32 inch or less shall be disregarded in this computation as shall voids within the applicable forward region of the fuze well prescribed by drawing 8837902) . and shall be subject to the restrictions placed upon cavities, exccept that 80 percent of the projected length and 80
9、 percent of the projected area shall be considered for acceptance purposes. in Segment A and not more than a total of two transverse cracks shall be permitted in Segments B and C combined. Cracks shall be disregarded in Segment D, and DI. 3.3.5 Base separation. There shall be no base separation grea
10、ter than .O15 inches between the base of projectile and the charge. This pertains to a sectioned projectile after the post cycle heat. 3.3.3 Porous areas. Porous areas shall be treated as cavities 3.3.4 Cracked charges. NO transverse crack shall be permitted 3.4 Loading of high explosive 3.4.1 Matin
11、g surfaces. The mating surfaces of threads shall be free of caked explosive and all threads shall be free of foreign material. If a chemical cleaner is required, acetone or methylene chloride shall be used, Care shall be taken to prevent the chemical cleaner from coming into contact with the charge
12、and becoming entrapped in the projectile. projectile before loading or added to the projectile during initial pouring or cooling. coating shall not be loaded. shall be dry when the high explosive is poured into the projectile (see 4.4.2.1). 3.4.4 Projectile interior cavity. The interior cavity of th
13、e projectile prior to loading shall be free from foreign matter. 3.4.2 Solid explosives. Solid explosive shall not be in the 3.4.3 Coating. Projectile having the interior wall imperfectly The interior surface of the projectile 4 Provided by IHSNot for ResaleNo reproduction or networking permitted wi
14、thout license from IHS-,-,-MIL-P-45455E 13 M 7977906 03072h1 1 M - MIL-P-4 5 4 5 SE (AR) 3.4.5 Fuze well. The fuze well shall be free from any foreign 3.4.6 Unsolidified pool of paint. There shall be no unsolid- matter or loose explosive prior to assembly of the liner. ified pool of paint or blister
15、 in the bottom of the cavity prior to loading of the explosive. 3.4.7 Exterior surfaces. There shall be no explosive on the exterior surf ace of the projectile after loading. 3.4.8 Body cavity. The body cavity shall be free of scale, fins, burrs, draw marks-, laminations, imbedded foreign matter, pi
16、ts and sharp edges. 3.5 Proving ground test. The projectiles shall comply with the following requirements when tested as specified in 4.5.2. 3.5.1 Horizontal. range 3.5.1.1 The mean range of any group of projectiles shall vary not more than + 1% from the expected firing table range after correction
17、to standard conditions. 3.5.1.2 The horizontal range probable error shall be no greater 3.5.2 Deflection 3.5.2.1 The mean deflection of any group of projectiles shall vary not more than 5 10% from the expected firing table deflection after correction to standard conditions. than .25 percent of range
18、 after correction for velocity variation. 3.5.2.2 The probable error in deflection shall be no greater than .O6 percent of mean range. 3.5.3 Safety. There shall be no premature burst or indica- tion of metal parts failure in the gun bore or in flight before impact, when the loaded projectile is test
19、ed between 54,000 SI 58,000 pounds per square inch (psi) chamber pressure. 3.6 First Article inspection. This specification contains technical provisions for first article inspection. Requirements for the submission of first article samples by the contractor shall be as specified in the contract. 5
20、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-P-45455E 13 M 7777706 03072b2 3 W MIL-P-4 54553 (AR) 3.7 Exudation. After heat cycling of TNT and Comp B filled projectiles, there shall be no exudation in the fuze well or exterior of the projecti
21、le. 3.8 WorkmanshiE. The requirements of workmanship are as s.hown on the applicable drawing, in the applicable specifications and the follow i ng : 3.8.1 Cleaning. If required, the cleaning method shall not be injurious to any of the parts nor shall the parts be contaminated by the cleaning agent.
22、3.8.2 Protection of the rotating band. Care shall be exercised at all times so that the rotating band of each projectile will not be nicked or burred. 3.8.3 Painting. Painting shall comply with the requirements of the applicable drawing. esting and packing for shipment. Drying time prior to testing
23、shall be in accordance with the applicable specification. grease, chips, rust corrosion or other foreign matter, prior to inspection and shipping All paint shall be dry to the touch before 3.8.4 Foreign matter. No part or assembly shall contain dirt, 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibilit
24、y for inspection and standard quality assurance provisions. Unless otherwise specified herein or in the contract, the provisions of MIL-A-48078 shall apply and are hereby made a part of- this detail specification. inspections shall be performed on this item: 4.2 Classification of inspections. The fo
25、llowing types of a. First Article Inspection b. Quality Conformance Inspection 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-45455E (AR) 4.3 First Article Inspection 4.3.1 Submission. The contractor shall submit a first article sample as de
26、signated by the Contracting Officer for evaluation in accordance with the provisions of 4.3.2. The first article sample shall consist of the following items in sample quantities as indicated. - Part Description Drawing Proj ec tile 8837902 Quant i ty 20 4.3.2 Inspections to be performed. .See MIL-A-
27、48078 and Table II specified herein. 4.3.3 Rejection. See MIL-A-48078 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-f I I : i i - rl 8 rl cv 4 M M . o= * O0 O0 oo oo oh0 oo *o o o o o o dd dd 0 a. d O0 O0 oh0 oo d.0 o- O= In InIn In In w ww w o o
28、 O0 o O . . In x ri k 4 rl PJM d In O o O0 o CJ 1 14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-c P B ci U U rl E! * O Y s u mcv cv cv cv cvni mm m m m mm . *. . . . . . - O0 o o o O0 d al H al U al C O 2 5 15 Q) iJ 0 d O m Po E r4 2 n o o cj r(
29、 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-Lt5Lt55E 13 7477706 0307272 b MIL-P- 4 5 4 5 5E (AR) 4.4.3 Testing 4.4.3.1 Cavitation - (see 3.3 except 3.3.2). Cavitation defects are classified as follows: Cri ti cal 1. Cavitation, cracks or
30、 annular rings in Segment A or B in excess of that permitted in Table I. 2. Cavitation or annular rings in Segment C in excess of 3. Cracks in Segment C in excess of that permitted in 4. Cracks in excess of the number permitted by 3.3.4. 5. Base separation (see 4.4.3.1.1). 6. Cavitation in Segment D
31、 in excess of that permitted that permitted in Table I. Table I. in Table I. 7. Cavitation in Segment D in excess of that permitted in Table I. This test shall be performed on all projectiles (100 percent The radiographic test shall be performed as specified inspection). in 4.5.1, using equipment in
32、 accordance with 4.4.4. 4.4.3.1.1 Base separation - Critical defect. Projectiles showing the largest base separation as determined by radiographic examination prior to post cycle heat treatment shall be selected for sectioning at the following rate. Select projectiles at a rate of one (i) out of fiv
33、e hundred (500) projectiles to be included in the post cycle heat treatment lot with a minimum of two (2) samples per lot. treatment and sectioned for determination of base separation. Thereafter, if insufficient samples are available with base separation, a sufficient number of samples shall be ran
34、domly selected from the post cycle heat treatment lot to make up the required sample. These projectiles are to be included in the post cycle heat The samples selected for sectioning must be place 16 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL
35、-P-45455E (AR) in the coolest area of the post cycle igloo. Any projectile after sectioning which has base separation exceeding .O15 of an inch shall be classed defective, and the entire post cycle heat treatment lot re j ec ted. 4.4.3.2 Proving ground test. The projectiles shall be observed for com
36、pliance with the requirements specified in 3.5. The test shall be performed as specified in 4.5.2. Defects shall be classed as follows: Category Defects Cri tical: 1. Premature burst or metal parts separation. Major : 101. Mean range shall not vary more than + 1% (see 3.5.1). 102, Horizontal range p
37、robable error shall be no greater 103, Deflection shall not vary by more than + 10% (see 3.5.2) 104. Deflection probable error shall be no greater than .06% than .25 percent (see 3.5.1). (see 3.5.2). Minor: None defined. 4.4.3.2.1 Functioning. The functioning test shall he conducted in accordance wi
38、th 4.5.2. 4.4.3.2.1.1 Beginning with the first lot produced and continuing until three consecutive lots have complied with the acceptance criteria specified herein, a random sample of 15 projectiles shall be selected from each lot for this test. If a premature burst occurs, if the probable error of
39、range or deflection of the sample multiplied by the factor 0.69 exceeds the applicable lot requirement or if the mean deviation from the expected range or deflection exceeds the maximum requirement, the lot shall be rejected. 4.4.3.2.1.2 After three consecutive lots have met the criteria of 4.4.3.2.
40、1.11 a random sample of 10 projectiles shall be selected 17 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-45455E (AR) from each lot for this test. If a premature burst occurs, if the probable error of range or deflection of the sample multipl
41、ied by the factor 0.65 exceeds the applicable lot requirements or if the mean deviation from the expected range or deflection exceeds the maximum requirement, the lot shall be rejected. 4.4.3.2.2 Safety - (See 3.5.3) - Critical defect. Five projectiles shall be randomly selected from the lot for tes
42、ting as specified in 4.5.2. If any projectile fails to comply with the applicable requirement, the lot shall be rejected. 4.4.3.2.3 Test validity. If for any reason the proving ground considers that the test conditions have detrimentally affected the test results, the test shall be. considered inval
43、id and a new test shall be performed with additional samples. 4.4.4 Inspection equipment. The contractor shall submit for approval inspection equipment designs in accordance with the terms of the contract, See Section 6 of MIL-A-48078 and paragraph 6.3 herein. 4.4.5 Exudation - Minor defect. Six pro
44、jectiles from the hottest area of the post cycle oven shall be used for the sample. Any projectiles with exudation shall be cause for rejection of the post cycle treatment lot; 4.5 Test Methods and Procedures 4.5.1 Radiographic examination 4.5.1.1 Determination of projectile cavitation. The projecti
45、les shall be subjected to radiographic examination. radiographic beam shall be located in a plane which is perpendicular to the longitudinal axis of the projectile and tangent to the base of its internal cavity. The outline of the explosive charge shall be clearly defined at all points. Examination
46、of the radiograph shall be made to determine compliance with applicable requirements. No images of lead masks, containers, fixtures, identifying marks, or other extraneous features should project into the region of explosive under inspection, with the exception of specified penetrameters and radiati
47、on screening required to reduce film densities to readable levels in the thinner areas of the shell. Such screening should be free of any radiographically observable features in the projected area under inspection. Radiographic equipment , The 18 Provided by IHSNot for ResaleNo reproduction or netwo
48、rking permitted without license from IHS-,-,-MIL-P- 4 5 4 5 5E (AR) operations and procedures shall be qualified in accordance with MIL-STD-453 (see 4.5.1.2). In addition, the sensitivity of the radiographic teehnique shall be 2.0 percent and the minimum photographic density of the film used shall b
49、e no less than 1.25 at every point within the projected area of explosive, including the base, with the maximum density no greater than to permit adequate inspection over the entire area of interest, as determined in accordance with 4.5.1.3 and 4.5.1.4. All defect-like features in the area of interest on a radiographic image shall
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