1、flIL-C-LOOLI7A LO 9797706 0272788 i j Septeniber 1964- S UPFA5EDING 28 NOVZKER 1949 MILE10049 (GTd) . MILITARY SPECIFICATION CANNON, 76MM GnI: BI32 1. SCOPE 1.1 2. APPLICABLF: DOCUMENTS 2.1 The following documents of the issue in effect on date of invitation This specification covers one type of gun
2、 cannon. for bids or request for proposal form a part of the specification to the extent specified herein. SPECIFICATIONS Mili t q MIL-C-13931 - Cannons, Mortars, Recoilless Rifles and Guns, General Specification for NIGM-.+72 - Magnetic Particle Inspection Process for Ferromagnetic Material DRAWING
3、S U. S. Amy Weapons Command EPL 73092a - Engineering Parts List for Cannon, 76MM Gun: M32 PUBLICATIONS U. S. Am. Weapons Command ISQAP 73092W - List of Supplementam QualitrAssurance Rovisions for -. . Cannon, 76h Gun: M32- PDS p730924I. - Packaging Data Sheet for Cannon, 76m Gun: UDS 7309241 - List
4、of Packaging Data Sheets for Cannon, 76MM Gun: (Copies of specifications, standards, drawings and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) M32 W2 I 4 Provided by IHS
5、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-3. REQUIrnlENTs 3.1 Materiais and construction. Cannons and parts thereof shall conform to this specification, the drawings and specifications listed in EPL 7309W and MIL-(3-13931. 3.1.1 Bore and chamber surfaces. The
6、 bore and chamber surfaces.shaU be free from material defects such as cracks, laps, pipes, nonmetsllic inclusions, slag pockets and machining defects such as tool gouges, tears, bums, and chatter marks. 3.1.2 Recoil surface. The recoil surface of the tube shall be chrome plated in accordance with th
7、e requirements of MIM-33931 for chrome plating of the chamber and bore. 3.2 Breech mechanism. The breech mechanism shall operate without evidence of interference, erratic movement or malfunction. crank during counter-kecoil or manipulation of the operating-handle to open the breech shaU rotate the b
8、reechblock-crank rearward and downward thereby dropping the breechblock to open the breech. The extractors shail operate in unison to eject the empty case and shall latch the breechblock in the open position. breech operating mechanism shall return the breechblock to the.closed position when the ext
9、ractors are tripped or when the breech is closed manually. clockwise rotation of the adjustor shall increase the preload on the closing spring. 3.3 Firinn mechanism group. The cocking, percussion and trigger mechanisms shall function without binding, evidence of interference or erratic movement. Dur
10、ing descent of the breechblock, the cocking-lever forced by a camming surface on the breech-ring,shell engage the retractor which In tuni shall force the guide and firing-pin rearward, compressing the firing-spring and allowing the sear to iatch the guide and firing-pin in the cocked position. Rearu
11、ard movement of the trigger plunger shall pivot the trigger, allowing-the sear to rotate and release the percussion mechanism. The compressed firing-spring shall force the firing- pin to protrude beyond the face of the breechblock and thereby compress the retracta ing spring which SU then withdraw t
12、he firing pin behhd the front face of the breechblock. The firing pin protrusion, measured from the Carmning of the operating- The Counter- 3.3.1 Firinn f in motnision. front face of the breechblock, shall be not less than 8.10 nor more than 0.16 2 . - - . . .- - . - Provided by IHSNot for ResaleNo
13、reproduction or networking permitted without license from IHS-,-,-WIGC-10049A (WC) - 3.4 Proof testinq. 3.4.1 Fir& of production. 1 The first cannon and the firat repair tube manufactured under a contract ahall be subjected to the production engineering testa specified y the responsible commodity ar
14、senal and the firing testa specified in 4.3. 3.4.2 RenuLar P roduction. The cannons and repair tuba after the first of production shall be capable-of withstanding the proof firing teats specified in 4.3. fm cracka, fractures, tears, and other injurious defects as evidenced by visual examination and
15、magnetic particle or liquid penetrant testing. shall not exceed the -(mi,imUm) basic diameter specified on the applicable drawings by more than the amounts shown in Table I. 3.4.3 Matenal soundness. After the firing tests, Su pa2-t 8- be free 3.4.4 Bore enlar ement. Bore diameters across Lands after
16、 proof fihg Table I Allowable bore enlargement Distance forward of commencement of 2 cals. to rifling 0.1 Inch 1.0 Inch 1 cal. Muzzle Amount (Inch) O .O06 O .o06 o .o05 O .o04 NOTE: Interpolate to determine the allowable bore enlargement at distances other than the distances listed. 4. QUALIT ASSRAN
17、cE PRVISIONS 4.1 Responsibility for inspection. Unless otheruise Specified in the contract or purchase order, the supplier is responsible for the performance of ail inspection requirements as specified herein. the supplier mag utilize his own facilities or any conmercial laboratory acceptable to the
18、 Government. any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and senrices conform to prescribed requirements. 13931 except as otherwise modified or specified herein. Except as otherwise specified, The Government reserves the right
19、to perform 4.2 Inspection. Inspection shall be performed QI accordance with MIM- 4.2.1 AQL values. The acceptable quality levels are set forth in the SQAPS listed in ISQAP 73092w. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-10047A LO M 77
20、77706 0272773 - MIL-C-10049A (WC) 4.2.2 Recoil surfaces. 4.2.2.1 Before plating. Visually and dimensionally inspect the recoil 4.2.2.2 After plating. Visually and dimensionally inspect the recoil 4.2.3 Functioning of breech mechanism. Manually operate-all parts of the breech mechanism of each assemb
21、led cannon a minimum of two complete cycles. Any evidence of binding, scraping, rubbing, looseness or other malfunction of any component or failure to completely eject an empty case shall be cause for rejection. surface of each tube. :. surface after plating and the post-plating thermal treatment of
22、 each tube. 4.2.4 Firiw mechanism overtravel. Determine overtravel of the firing mechanism by the following procedures: Replace the firing mechanism retainer Kith a retainer having a hole of proper size and location as to permit a depth gage to reach the rear face of the firing-pin-guide. slowly to
23、the point where the seai- engages the firing-pin-guide, as indicated by an audible click. distance from the rear face of the breechblock to the rear face of the firing- pin-guide Kith a depth gage. breechblock, slowly lower the breechblock to the bottom of its travel. of the breechblock will cause t
24、he firing-pin-guide to move backward and thereby cause the depth gage reading to change. wiU. be a minimum. This point may or may not be at the bottom of the brsechblock travel, due to the curved cam surface of the lever plus tolerance build-up on the components involved. Record the minimum depth ga
25、ge reading. Subtract the second reading from the first to determine the overtravel of the firing mechanism. Lower the breechblock Holding the breechblock in this position, measure the Holding the depth gage in position against the Movement At some point, the depth gage reading 4.2.5 Firinn pin protr
26、usion. Measure the firing-pin protrusion before assembly of the breechblock into the breech recess. firing mechanism into the breechblock, pueh the firing pin forward fully and measure the protrusion by use of gage blocks or a depth gage. After assembly of the k.2.6 Headspace. Headspace is the dista
27、nce from the rear surface of the tube to the front face of the breechblock. With the breechblock and the tube assembled and the breechblock in the raised position,measure the headspace with gage blocks, or if available, a go-no-go gage. The measurement is taken by lowering the blocks or gage into th
28、e space between the rear face of the tube and the front face of the breechblock. 4.3 ProvinR nround inspection. Cannons and repair tubes supplied under tks specificat3on shall be sukjected to proving ground inspection, in accoxkhce Kith the applicable inspection plan at a test agency designated by U
29、SATECOM. The inspection shall be done by Government personnel. . 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-10049A (WC) 4.3.1 Proof-firinp procedure. The first cannon and the first repair tube manufactured under any contract shall be pro
30、of fired in accordance with Table II. “Subsequent cannons and repair tubes shall be fired in accordance with Table III. Table II Proof firing schedule for first of production Percent of Rated Number of Rounds Maximum Pressure 1 50 1 75 1 100 U5 100 2 U 1 100 2 1 Table III Proof firing schedule for r
31、egubr production Percent of Rated Number of Rounds :mum Pressure 1 115 4.3.2 Combined proof firing. The proof firing for acceptance of the cannon may be combined with that of the mount and recoil mechanism. combined tests, rounds in addition to those required by Table III may be fired. (See 4.3.4.1)
32、 in such 4.3.3 Firing rate. Proof firing shall be conducted at a rate of fire not to exceed one round per minute. 4.3.4 InsDection after woof firinq. 4.3.4.1 Measure the bore diameter for compliance with 3.3.4. schedule of Table III is exceeded, not more than eight (8) additional rounds shall be fir
33、ed prior to bore measurement and examination with a borescope. block, breech ring, muzzle brake and evacuator chamber by magnetic particle test conducted in accordance with MIGM-U+72 for compliance with soundness requirements. drawing. When the 4.3.4.2 Exterior surface. Inspect the outer surfaces of
34、 the tube, breech- Acceptance criteria shall be as specified on the applicable 4.3.4.3 Proof marking. tube near the serial number. . Proof acceptance marking shall be located on the 5 c Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IL-C-LOOLISA 20
35、W 9999906 0292793 HIGc-l049A (WC) 4.4 Inapection of the preparation for delivers. 4.4.1 The classification of defects and AQLs for examination of the preparations for delivery are as foows: Catenories Defect -24 101 Ulegible or incorrect marking. 1.0 102 improper level of packaging and packing. 1.0
36、103 inadequate cleaning and drging. 1.5 104 Smproper preservative application. 1.5 105 Missing or improper barrier material. 1.5 Major (See procurement documents. ) io6 Impyoper or inadequate blocking and bracing. 1.5 107 Improper closure and strapping of containers. 1.5 Minor Workmanship of contain
37、er and packaging. 4.0 5. PREPARATION FOR DELIVERY 5.1 Cannons. Cannons shall be prepared for deliveq in accordance Kith PDS p7309241. 5.2 Repair part s. Repair parts shall be prepared for delivery in accordancc Kith the Packaging Data Sheets listed on LPDS 730924l 6. NOTES . Procurement documents sh
38、ould specie the following: er and date of this. specification. . _- ._ (b) Serial numbers for cannons and repair tubes. - (c) List of repair parts required. (d) Production engineering tests on first of production cannon or repair tube. Availability of inspection equipment from Ordnance stocks. (e) (
39、 f .) Extent of suppliers I responsibility for Government-furnished and supplier-acquired final inspection equipment. Levels of preservation, packaging and packing.* - NOTE: protection for multiple domestic shipnents, handling, and indoor storage periods up to six months from date of initial packagi
40、ng. (See 6.2.) (g) Level tlB1l is intended to provide adeqyate and economical 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-f .I MIL-C-10047A LO 9 7777706 027277q 3 (h) When a pilot pack is required. (i) That packages opened for acceptance inspec
41、tion sw be repackaged at the suppliers expense. 6.2 Storage surveillance. Item preserved and packaged in accordance with level B requirements must be inspected to deterne their condition when not used uithin a six-month period. Items not used dthin this period should be represerved and repackaged in
42、 accordance with this specification as QteImined necessary by storage conditions and anticipated storage tium. Watervliet, New York, 12189. 6.3 The responsible arsenal for this cannon is Waterviiet Arsenal, custodian : Army-WC Preparing activity: Amy-WC (Wvt) Project No. 101!j-Al47 i . . . _- .- 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
