1、% ir .i- a MIL-M-b39 10 E 7999906 0352534 L1 53703 MIL-M-63988 (AR) 14 July 1988 MI LI TARY SPEC IF1 CAT I ON MOUNT, HOWITZER, M178 This Specification is approved for use within the U. S. Army Armament, Munitions and Chemical Command, and is available for use within all Departments and Agencies of t
2、he Department of Defense. 1. SCOPE 1.1 Scope. This specification covers one type of hydropneumatic gun mount for use in combat vehicles such as the M109 SPH. 2 . APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards i The following Specification and Standards form a part
3、of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation. SPEC1 F ICATIONS FEDERAL B
4、B-N- 4 11 MI LI TARY MIL-H- 6 O 8 3 MIL-G-10924 MIL-W- 6 3 150 -Nitrogen, Technical -Hydrualic Fluid, Petroleum Base, Preservation and Operation -Grease , Automotive and Artillery -Weapons and Support Materiel Standard Quality Assurance Provisions For Beneficial comments (recommendations, additions,
5、 deletions) and any pertinent data which may be of use in Improving this document should be addressed to: Commander, U.S. Army Armament,Munitions and Chemical Command, Atin. AMSMC-QA. Picatinny Arsenal, New Jersey 07806-5000 by using the self-addressed Standaidiza- on Document Improvement Proposal (
6、DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 1025 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. THIS DOCUMENT CONTAINS 20 PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL
7、-M-637 LO 777770b 0352535 b W MIL-M-63988 (AR) STANDARDS MILITARY MIL-STD-109 -Quality Assurance Terms and Definitions MIL-STD-130 -Identification Marking of U.S. Military Property 2.1.2 Other Government documents, drawinqs and publications. The following other Government documents, drawings and pub
8、lications form a part of this specification to the extent specified herein. Unless otherwise specified, the issues shall be those in effect on the date of the solicitation. DRAWINGS US ARMY ARMAMENT RESEARCH,DEVELOPMENT AND ENGINEERING CENTER (ARDEC) Klo895694 -Variable Recoil, Cover Klo955766 -Recu
9、perator Cover K12012127 -Mount Installation Howitzer, M178 K12012129 -Cradle Assembly Howitzer PUBLICATIONS Pl2012127 -Packaging Data Sheet for Mount, Gun, M178 (Copies of specifications, standards, and other Government documents required by contractors in connection with specific acquisition functi
10、ons should be obtained from the contracting activity or as directed by the contracting officer.) 2.1.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification shall take precedence. Nothing in this specifi
11、cation, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained. 3 . REQUIREMENTS 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 sh
12、all conform to the material specifications referenced on the applicable drawings. Certification of material may be accepted in lieu of material tests. The contractor shall be responsible for determining that materials, assemblies, and parts requiring product qualifications are listed or qualified fo
13、r inclusion on the applicable Qualified Products List (QPL). In the instance that a qualified vendor no 2 #- A a a a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-63788 10 I 7777906 0352536 8 I MIL-M-63988 (AR) L a longer exists on the QPL, t
14、he 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 inspection record s
15、hall 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 mount, and all of its assemblies and components, shall be constructed and assembled as specified on the applicable drawings referenced
16、 on Drawing K12012127. Dimensions and tolerances shall be as specified on the drawings. 3.3.1 Hydraulic system. 3.3.1.1 Particle size. The recoil mechanism shall be filled with hydraulic fluid, bled and refilled until all air and measurable moisture are eliminated. The initial and subsequent filling
17、 of the hydraulic system shall be with hydraulic oil conforming to MIL-H-6083 and filtered through a 5 micron filter. Within five minutes after mechanical gymnastication, a minimum of one pint of oil shall be removed from the lowest drain hole from each recoil cylinder. Sample shall be drained into
18、a suitable container. Particles in each sample shall not exceed the limits specified in Table I. TABLE I. Particle limits. Particles in either sample shall not exceed the following: Metallic Ferrous - 40 microns and a maximum of two particles over 40 microns but not exceeding 200 microns in greatest
19、 dimension. Non-Ferrous - 200 microns and a maximum of two particles over 200 microns but not exceeding 400 microns in greatest dimension. N on-Me tal 1 i c Abrasive - 200 microns and a maximum of two particles over 200 microns but not exceeding 400 microns in greatest dimens ion. Non-abrasive - No
20、limit, however, close surveillance to be maintained to insure minimal quantity. Lint/Fibers - 600 microns x 60 microns and a maximum of eight particles over 600 microns x 60 microns but not exceeding 3000 microns x 200 microns. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted w
21、ithout license from IHS-,-,-MIL-M-63788 LO 7799706 O352537 T = # MIL-M-63988 (AR) 3.3.1.2 Leakage. During cycling and after all cycling, no indication of unusual hydraulic leakage shall occur. 3.3.2 Surface cleanliness. All finish machined surfaces shall be free of condensation or other foreign resi
22、dues 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 shall be performed in the controlled environment specified in 6.3. handfitted during assembly unless such modif
23、ication has been authorized by an approved drawing change, or is authorized by instructions presently listed on the drawings. 3.3.4 Air, qas and accumulator system. The gas system shall be clean and free of all foreign matter. The hydroscopic content of the air used to blow the lines shall not excee
24、d one percent of the total volume of the air used. The system shall be filled, bled, and refilled until al1 air and measurable moisture are eliminated. a 3.3.3 Part modification. No parts shall be altered or 3.3.5 Cylinder pressure. - The cylinders of the mount shall withstand the pressures specifie
25、d on the drawings without damage, permanent deformation or leakage. 3.3.6 Pistons, rods, and nuts or collars. The pistons, piston rods, and nuts or collar shall withstand the pull test specified on the drawings without permanent set or failure of the screw threads. 3.3.7 Lubrication. Lubricants conf
26、orming to MIL-G-10924 shall be used for the assembled mount. 3.3.8 %. The nitrogen used to charge and fill the nitrogen chamber shall conform to BB-N-411. The charging pressure shall be specified on Drawing 12012127. 3.4 Performance. - 3.4.1 Mechanical qymnastication. Each mount shall be subjected t
27、o the mechanical 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 3.4.5 and 3.4.6. 4 Provided by IHSNot for ResaleNo reproduction or netw
28、orking permitted without license from IHS-,-,-MIL-M-63988 20 7779906 0352538 I I MIL-M-63988 (AR) 3.4.1.1 Counter recoil (CTRR) time. The CTRR for each mechanical gymnastication shall not exceed the requirements specified below. CTRR Stroke Time Buff er S troke Time Elev. in Degree (Seconds) (Second
29、s) 00 3.500 - 5.500 450 Long Recoil 3.500 - 8.500 45O Short Recoil 3.500 - 6.500 Maximum 3.500 - 7.000 3.000 - 5.000 3.000 - 8.000 3.000 - 6.000 3,000 - 6.500 The gymnasticator is set for 15 + 1 second pull back time at Oo elevation and 36 inches. This setting is not changed for other elevation simu
30、lations. 3.4.1.2 Operatinq rods. All operating rods shall be inspected for scratches during and after mechanical gymnastication is completed. 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 sea
31、l and cleaning and inspection of the cylinder assembly components. Light scratches that can be polished out and that do not re-occur with continued cycling are not cause for teardown. 3.4.2 Functional firinq. The Gun Mount shall withstand the functional firing test as specified in 4.6.2 without evid
32、ence of malfunction or failure and shall meet the criteria of 3.4.2.1 through 3.4.2.3. During and after functional firing, the gun mount shall meet the requirement of 3.4.5, 3.4.6 and 3.4.7. 3.4.2.1 Counter-recoil (CTRR). 3.4.2.1.1 CTRR velocity. At 1 inch from the complete in-battery position, the
33、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 be : Simulated Elevation Above 300 F 300 F and Below O0 0700 - 1.900 .700 - 3.500 Maximum 0900 - 3.900 .goo - 5.900 3.4.2.2 Recoil cycle. The recoil cycle travel (
34、in inches) and total cycle time (in seconds) shall be as follows: 3.4.2.2.1 Recoil travel in inches. Simulated Elevation Recoil Travel O0 Maximum 27 - 36 18 - 27 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-63988 (AR) 3.4.2.2.2 Total cycle
35、 time in seconds. S irnuia Elevation Above 300 F 300 F and Below I O0 0900 - 2.000 .900 - 3.600 Maximum 1.000 - 4.000 1.000 - 6.000 3.4.2.3 Recoil performance zones. For all 100% acceptance test cycles, actual recoil cycling oil pressure versus time curves shall be within defined recoil performance
36、zones shown in Figures 1 and 2. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I H rn pi I P rn cn w - MIL-M-b3788 LO m 9777706 0352540 T m MIL-M-63988 (AR) O 0.03 0.06 0.09 0.12 0.15 O. 18 TIME - SECONDS FIGURE 1. LONG RECOIL - FUNCTIONAL FIRING 7
37、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-H- CA pi I MIL-M-6398B LO W 9999406 0352543 3 MIL-M-63988 (AR) O 0.03 0.06 0.09 o. 12 0.15 TIME - SECONDS FIGURE 2. SHORT RECOIL - FUNCTIONAL FIRING 8 b Provided by IHSNot for ResaleNo reproduction or n
38、etworking permitted without license from IHS-,-,-MIL-M-63988 10 = 7777706 03525Y2 3 c I lm MIL-M-63988 (AR) 3.4.3 Proof firinq. Each sample mount shall be subjected to proof firing at a Government proving ground as specified in 4.6.3 without evidence of malfunction or failure and shall meet the crit
39、eria of 3.4.3.1 through 3.4.3.3. During and after proof firing, the gun mount shall meet the requirements of 3.4.5, 3.4.6 and 3.4.7. 3.4.3.1 CTRR velocity. At one 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 c
40、ycle time. The CTRR cycle time at 400 F to 1000 F in seconds shall be: Elevation in Deqrees CTRR Stroke O0 Maximum -650 - 1.250 -850 - 1.850 3.4.3.2 Recoil cycle. The recoil cycle travel (in inches) and total cycle time (in seconds) shall be as follows: 3.4.3.2.1 Recoil travel in inches. Elevation R
41、ecoil Travel O0 Maximum 27 - 36 18 - 27 3.4.3.2.2 Total cycle time in seconds. E 1 eva t i on Total Cycle Time O0 Maximum -800 - 1.400 1.000 - 2.000 NOTE: Conditions of hanging-out-of-battery at the higher elevations are acceptable on the M178 Gun Mount provided it returns to battery upon lowering t
42、ube to loading elevations (approximately 110 mils). The test agency is to specify length of hanging-out-of-batterys in reports. 3.4.3.3 Recoil performance zones. For all full charge firings, actual recoil cyclinder oil pressure versus time curves shall be within defined recoil performance zones show
43、n in Figures 3 and 4. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2000 -: H u3 I pi 1500 2 P LA $ ! - 6.6 Subject term (key word) listinq. Combat vehicle Functional firing Gun mount Gymnastication Howitzer Hydraulic system H ydr opne uma t ic Proof firing Recoil Custodian : Army - AR P repar i ng ac ti vi ty (Project 1025-A134) Army - AR 20 *U.S. GOVERNMENT PRINTING OFFICE: 19 - M3/92600 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
