1、MIL-M-70821 LO 777770b 0358028 8 U . 5-57-03 I INCH-POUN$ MIL-M-70821 (AR) 18 November 1988 MILITARY SPECIFICATION MOUNT, HOWITZER, M182 This specification is approved for use within the U.S. Army Armament, Munitions and Chemical Command, and is available for use by all Departments and Agencies of t
2、he Department of Defense. 1. SCOPE. 1.1 Scope. This specification covers one type of hydro- pneumatic gun mount for use in combat vehicles such as the M109 SPH. 2. APPLICABLE DOCUMENTS. 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following specifications, standards
3、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 issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2) .
4、 SPECIFICATIONS FEDERAL BB-N-441 - Nitrogen, Technical MILITARY MIL-H-6083 - Hydraulic Fluid, Petroleum Base, Preservation and Testing MIL-G-10924 - Grease, Automotive and Artillery MIL-W-63150 - Weapons and Support Materiel, Standard Quality Assurance Provisions For MIL-A-70625 - Automated Acceptan
5、ce Inspection Equipment Design, Testing and Approval of Eencficial comments (recommendations, additions, deletions) and any pertinent data which may bc of use in improving this document should be addressed to: Commander, U.S. Army hament, Munitions, and Chemical Command, Attn. AMSMCQA, Picatinny Ars
6、enal, New Jerscy 806-5000 by using the self-addressed Standardization Document Improvement Proposai (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A mc 1025 nIsTRIBUTIW STATWENT 4, APIXOV for Dubiic release;ted. Licensed by Information Handling ServicesMIL-U-70821 10 M 777
7、7906 0358027 T MILAM-O&X (AR) STANDARDS MILITARY MIL-STD-109 - Qualify Assurance Terms and Def iditions MIL-STD-130 - Ideng-lfication Marking of U.S. Mi 1 itary Property (Unless otherwise indicated, copies of the above specifications and standards are available frm &e Naval Publications and Forms Ce
8、nter, (Attn: NPODS), 5801 Tabur Avenue, Philadelphia, PA 19120-5099.) 2.1.2 Other Government docume&ts, drawings and publications. The following other Government documents, drawings and publications form a part of this specification to the extent specified herein. Unless otherwise specified, the iss
9、ues are those cited in the solicitation. DOCUMENTS MWO 9-2350-311- 55-4 - Modification, Gun Mount, M178 to M182 DRAWINGS us ARMY ARMAMENT RESERCH DEVELOPMENT AND ENGINEERING CENTER (ARDEC) 12910860 - Modification kit, M182 Gun Mount PBL I CAT IONS , P129 1 O 860 - Packaging data sheet for Mount, Gun
10、, ML82 (Unless otherwise indicated, copies of the above documents, drawings, and publications are available from the U.S. Army ARDEC, Attn: . SMCAR-ESC-AA,-Picatinny Arsenal, NJ 07806-5000.) 2.2 Non-Government publications. The following document forms a part of this document to the extent specified
11、 herein. Unless otherwise specified, the issues f the documents which 2 Licensed by Information Handling Services MIL-M-7O21 10 9999906 O358030 b MIL-M-70821 (AR) are DoD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of document
12、s not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D1744 - Petroleum Products, Liquid, Water In, By Karl Fisher Regent (Application for copies should be addressed to the American Society for Testing a
13、nd Materials, 1916 Race Street, Philadelphia, PA 19103-1137.) (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or other informational services.) 2.3 O
14、rder of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document shall take precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREME
15、NTS. 3.1 First article. When specified in the contract or purchase order, a sample shall be subjected to first article inspection (see 4.4 and 6.2) . 3.2 Materials. Materials shall conform to the material specifications referenced on the applicable drawings. Certification of material may be accepted
16、 in lieu of material tests. The contractor shall be responsible for determining that materials, assemblies, and parts requiring product qualifica- tions are listed or qualified for inclusion on the applicable Qualified Products Lists (QPL). In the instance that a qualified vendor no longer exists on
17、 the QPL, the contractor is responsible for selecting a vendor whose product meets the minimum requirement of the specification. The contractor must also submit to the Government for approval documentation which confirms the vendors ability to meet the specification in question. Contractors inspecti
18、on record shall specifically list such components, name of supplier(s) , and number and date of applicable QPL or Government approved vendors not on a QPL. 3.3 Construction. The M182 Gun Mount, and all of its assemblies and components, shall be constructed as specified in MWO 9-2350-311-55-4 with di
19、mensions and tolerances as specified on the applicable drawings referenced on Drawing 12910860. Q 3 Licensed by Information Handling ServicesMIL-1-70821 LO 9777706 0354031 8 MIL-M-70821 (AR) 3.3.1 Hydraulic system. 3.3.1.1 Particle size. The recoil mechanism shall be filled with hydraulic fluid, ble
20、d, and refilled until all air and measurable moisture are eliminated. The initiai and subsequent filling of the hydraulic system shall be with hydraulic oil conforming to MIL-H-6083 and filtered through a 5 micron filter. Immediately after mechanical gymnastication, not to exceed 5 minutes, a 100 ml
21、 sample of hydraulic oil shall be taken from the lowest drain hole of each recoil cylinder. Samples shall be drained into a suitable container. Each sample must meet the requirements of Table I. TABLE I. Hydraulic fluid cleanliness. The water content of the hydraulic fluid shall not be more than 0.1
22、% as determined by standard method of test IAW ASTM Di744. The hydraulic fluid.shal1 be free of foreign materials within the following 1.imits: Particle Size below 50 microns 50 - 100 microns 101 - 200 microns 201 - 400 microns Quantity Allowed no limit 15 4 16 2 Particles over 400 microns are not a
23、cceptable unless they are fiber or lint. Only two particles of fiber or lint are acceptable, provided they do not exceed the dimensions of 40 microns in width and 3000 microns in length. 3.3.1.2 Leakage. During cycling and after all cycling, no indication of unusual hydraulic leakage shall occur. 3.
24、3.2 Surf ace cleanliness. All finish machined surf aces shall be free of condensation or other foreign residues from the time of final machining until final assembly. All parts and assemblies being assembled into the completed mount shall be free of all foreign material after assembly. Assembly shal
25、l be performed in the controlled enviroment specified in 6.3. 3.3.3 Part modification. No parts shall be altered or hand- fitted during assembly unless such modification has been authorized by an approved drawing change, or is authorized by instEuctions presently listed on the drawings. 4 d Licensed
26、 by Information Handling ServicesIL-M-30821 10 797770b 0358032 T m MIL-M-70821 (AR) 3.3.4 Air, gas and accumulator system. The gas system shall be clean and free of all foreign matter. The water content of the air used to blow the lines shall not exceed one percent of the total volume of the air use
27、d. The system shall be filled, bled, and refilled until all air and measurable moisture are eliminated. C 3.3.5 Cylinder pressure. The cylinders of the mount shall withstand the pressures specified on the drawings without damage, permanent deformation or leakage. 3.3.6 Lubrication. Lubricants confor
28、ming to MIL-G-10924 shall be used for the assembled mount. 3.3.7 Gas. The nitrogen used to charge and fill the gun - mount recuperator and replenisher shall conform to BB-N-441, Type I, Grade B, Class I. 3.4. Performance. 3.4.1 Mechanical gym nastication. Each- mount shall be subjected to the mechan
29、ical gymnastication test as specified in 4.6.1 without evidence of erratic movement and shall meet the requirements of 3.4.1.1 and 3.4.1.2. During and after gymnastication, the gun mount shall meet the requirement of 3.3.1, 3.4.5 and 3.4.6. 3.4.1.1 Counter recoil (CTRR) time. The CTRR time for each
30、mechanical gymnastication shall not exceed the requirements specified below. CTRK Stroke Time Buffer Stroke Time Elev. - in Degree ( S eco nds ) (S econds ) O0 45O Long Recoil 45O Short Recoil Maximum 3.500 - 5.500 3.000 - 5.000 3.500 - 8.500 3.000 - 8.000 3.500 - 6.500 3.000 - 6.000 3.500 - 7.000 3
31、.000 - 6.500 1 The gymnasticator is set for 15 + 1 second pull back time at 00 elevation and 36.0 + .2 inches from the battery. This setting is not changed for other elevation simulations. 3.4.1.2 Operating rods. All operating rods shall be inspected for scratches during and after completion of mech
32、anical gymnastication. Continued evidence of rod scratching will result in teardown of the affected cylinder, polishing out the scratch or replacing of the rod, replacing of the seals and cleaning and inspection of the cylinder assembly components. Light scratches that can be polished out and that d
33、o not re-occur with continued cycling are not cause for teardown. 5 Licensed by Information Handling ServicesMIL-M-7021 10- 777770b 0358033 1 MIL-M-30821 (AR) 3.4.1.3 Pistons, rods and nuts or-,collars. Pistons, rods, and nuts or collars shall: withstand mechanical gymnastication without permanent s
34、et or failure of th screw threads. 3.4.2 Functional firlnq. The Gun Mount shall withstand the functional firing test as specified in 4.6.2 without evidence of malfunction or failure and shall meet the criteria of 3.4.2.1 through 3.4.2.3. During and after funetional firing, the gun mount shall meet t
35、he requirements of 3.4.5, 3.4.6 and 3.4.7. I 3.4.2.1 Counter-recoil (CTRR). - 3.4.2.1.1 CTRR velocity. At 1.0 + .1 inch from the complete in-battery position, the CTRR velocity-shall not exceed one and one-half (1-1/2) feet per second. 3.4.2.1.2 CTRR cycle time. The CTRR cycle time in seconds shall
36、be: Simulated Elevation Above 300F O0 Maximum .700 - 1.900 .goo - 3.900 300F and Below .700 - 3.500 .goo - 5.900 3.4.2.2 Recoil cycle. The recoil cycle travel (in inches) and total cycle time (in seconds) shall be as follows: 3.4.2.2.1 - Recoil travel in inches. S imula ted Elevation O0 Maximum 3.4.
37、2.2.2 Total cycle time. Simulated E levat ion O0 Maximum Above 30% Recoil Travel 27 - 36 ia - 27 309 and Below - .goo - 2.000 .900 - 3.600 1.000 - 4.000 1.000 - 6.000 3.4.2.3 Recoil performance zones. For all functional firing test cycles actual recoil pressure versus time curves shall be within def
38、ined recoil performance zones shown in figures 1 and 2.) 6 Licensed by Information Handling ServicesflIL-M-7082L LO M 777770b 0358034 3 M MIL-P-70821 (AR) H v1 pc r e 4 H O O 2700 2400 2100 i800 1500 1200 900 600 I 300 O 0.03 0.06 0.09 o. 12 O. 15 0.18 O Time - Seconds FIGURE i. Long recoil - functi
39、onal firing. 7 Licensed by Information Handling ServicesH cn Pl I MIL-M-70B2L LO W 3999906 0358035 5 W MIL-P-70821 (AR) 2700 .O0t . f e O 0.03 0.06 0.09 0.12 0.15 b Time - Secdrids FIGURE 2. Short recoil - functional firing. 8 Licensed by Information Handling ServicesMIL-M-7082L LO 7977706 0358036 7
40、 MI L-M-7 08 2 1 (AR) 3.4.3 Proof firing. Each sample mount shall be subjected to proof firing at a Government proving ground as specified in 4.7.4 . 2 without evidence of malfunction or failure and shall meet the criteria of 3.4.3.1 through 3.4.3.3. After proof firing, the gun mount shall meet the
41、requirement of 3.4.5, 3.4.6 and 3.4.7. 3.4.3.1 CTRR. - 3.4.3.1.1 CTRR velocity. At 1.0 + .1 inch from the complete in-battery position, the CTRR velocity-shall not exceed one and one-half (1-1/2) feet per second. 3.4.3.1.2 CTRR cycle time. The CTRR cycle time at -500 to +1450F in seconds shall be: E
42、levation in Degrees CTRR Stroke O0 Maximum Above 300 F .650 - 1.900 300 F and Below - -650 - 3.500 .850 - 3.900 .850 - 5.900 3.4.3.2 Recoil cycle. The recoil cycle travel (in inches) and totdl cycle time (in seconds) shall be as follows: 3.4.3.2.1 Recoil travel in inches. Elevation Recoil Travel O0
43、Maximum 27 - 36 18 - 27 -_. 3 .k3.2.2 Total cycle time. Elevation Total Cycle Time O0 Maximum Above 300 F .800 - 2.1oO 300 and Below - -800 - 3.700 1.000 - 4.100 1.000 - 6.100 NOTE: Conditions of hanging-out-of-battery at the higher elevations are acceptable on the M182 gun mount provided it returns
44、 to battery upon lowering tube to loading elevations (approximately 110 mils). The test agency is to record the length of hanging-out-of-batterys in reports. 3.4.3.3 Recoil performance zones. For all proof firings, actual recoil oil pressure versus time curves shall be within defined recoil performa
45、nce zones in figures 3 and 4. 9 Licensed by Information Handling Services2800 2400 H rn p1 I 2000 2 i2 n 1600 I4 H O p: w 1200 E d u I4 H 800 O u 2 400 . o2 .o4 .O6 .O8 .10 .12 .14 Time - Seconds (Recoil Cycle) FIGURE 3. Lhg recoil - proof firing. 10 Licensed by Information Handling ServicesMIL-M-70
46、821 10 7777706 0358038 O MIL-P-70821 (AR) 3500 3000 2500 2000 1500 1000 500 Time - Seconds (Recoil Cycle) FIGURE 4. Short recoil - proof firing. 11 Licensed by Information Handling Services3.4.4 Climatic condidians. A ,sai$e as specified in 4.5.1 shall be proof fired as specified in 3:4.3 at each of
47、 the following temperatures: +1250F and -500F. 3.4.5 Hydraulic leakaqe. 3.4.5.1 Dynamic. Immediately f&li,bwing cycling of the gun mount there shall be no more than one fiiilliliter (ml) of oil accumulation per every five (5) cycib, tested at any seal interface location. Immediately folloGing this d
48、etermination all oil accumulations are to be wiped ci&n prior to an additional five (5) cycle incremented test. 3.4.5.2 Static. After the gun 68urit has set statically for 24 hours after completion of each teski (mechanical gymnastication, functional firing, proof firing) there shall be no more- tha
49、n 1 ml of oil accumulation at. any seal interface location and no evidence of seepage of hydrulic.fluid from any of the hydraulic tubes, manifolds, hose connections, and fill/bleeder vlvks. 3.4.6 Nitrogen leakage. The gun $ount recuperator and replenisher shall be examined for leakage of nitrogen gas per 4.5.2.8. 3.4.7 Analysis of data. The dati-recorded for 3.4.2, functional firing, and for 3.4.3, pr&f,firing, shall be analyzed. time is not satisfactory, as determined , , % by the procuring agency, the mounts shall be returned to the contractor. If
