1、Thi Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Armament Research, Development and Engineering Center, US Army Armament, Muni tions and Chemical Command, ATTN: SMCAR-CCB-SAS, Wate
2、rvl iet, NY 12189-4050 by using the sel f-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. avai 1 T MIL-C-70822 20 M 777770b 0358050 2 M MIL ITARY SPEC IF ICATION CANNON, 155MM HOWITZER: M284 pecification is approved for use b
3、y the Department of the Army and is ble for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification supports the acquisition of the Cannon, 155MM Howit- M284 consisting of a barrel assembly (tube, bore evacuator, and muzzle brake), a breech assembly,
4、and a firing mechanism assembly. includes the minimum essential Engineering and Packaging Requirements and the necessary Quality Assurance Provisions to determine that these requirements have been met, and consists of one type of cannon. This specification 2. APPLICABLE DOCUMENTS 2.1 Government docu
5、ments. 2.1.1 specifications and standards. The fol lowing specifications and standards form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those 1 isted in the issue of the Department of Defense Index of Specifications and Standa
6、rds (DODISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS MILITARY MIL-C-13931 - Cannon, General Specification for MIL-P-14232.- Parts, Equipment and Tools for Army Materiel, Packaging of MIL-1-45607 - Inspection Equipment, Acquisition, Maintenance and Disposition of A
7、Ms N/A FSC 1025 DISTRIBUTION STATEMENT A. Approved for pub1 ic re1 ease; distribution is un1 imi ted. 7 - 7 -. - THIS DOCUMENT CONTAINS -25 PAGES. - / - - - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70822 (AR) c I STANDARDS MIL I TARY ,
8、 MI L -STD- 129 - Marking for Shipment and Storage MIL-STD-1189 - Standard DOD Bar Code Symbology MIL-STD-1235 - Continuous Sampling Procedures and Tables for Inspection by Attributes MIL-STD-2073-1 - Procedures for Devel opment and Appl ication of Packaging Requ i remen t s (Unless otherwise indica
9、ted, copies of federal and military specifications, standards, and handbooks are available from the Naval Pub1 ications and Forms Center, (ATTN: NPODS), 5801 Tabor Avenue, Philadelphia, PA 19120-5099.) 2.1.2 Other Government drawings and publications. The following government drawings and publicatio
10、ns form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the sol ici tation. DRAWINGS (see 6.7) U. S. Army Armament Research , Devel opment and Engineering Center (ARDEC) 11 580150 - General Drawing, Cannon, 155MM Howitzer: M284 115801
11、22 - Firing Mechanism Assembly M49 EPL 1158?0150 - Engineering Parts List, Cannon, 155MM Howitzer: M284 SPI AM11580150 - Special Packaging Instruction, Cannon, 155MM Howitzer: M284 DL 11580150 y List of Inspection Equipment for Cannon, 155MM Howitzer: M284 PUBLICATIONS Master LQAP 11580150 155MM How
12、l tzer: M284 - Master List of Quality Assurance Provisions for Cannon, QAP-APPENDIX W VA - General Qual i ty Assurance Provisions (Copies of drawings, and other Government documents required by contractors in connection with specific acquisition functions should be obtained from the contracting acti
13、vity or as directed by the Procuring Contracting Officer. 1 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- NIL-C-70822 LO m 7777706 0358052 5 m MI L -C - 70822 (AR) 2.2 Non-Government publications. document to the extent specified herein. of the
14、documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). The following document(s) form a part of this Un1 ess otherwise specified, the issues Unless
15、otherwise specified, the issues of ASTM (American Society for Testing and Materials) ASTM D 3951 - Commercial Packaging, Practice for (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103-1137.) (Non-Governme
16、nt standards and other pub1 ications are normal ly avail ab1 e from the organizations that prepare or distribute the documents. may be available in or through .libraries or other informational services.) These documents also 2.3 Order of precedence. document and the references cited herein, the text
17、 of this document takes precedence. regulations unless a specific exemption has been obtained. In the event of a conflict between the text of this Nothing in this document, however, supersedes appl icable laws and 3. REQUIREMENTS 3.1 General requirements. Cannon and component parts shall be in accor
18、dance with the appl icable drawings, General Drawing 11580150, Engineering Parts List EPL 11580150, the requirements of this specification, the applicable paragraphs of the General Cannon Specification - MIL-C-13931 as incorporated in this document, and all referenced documents. order of precedence
19、(see 2.3). Any conflicts are to be resolved by means of the O 3.2 First article. The contractor shall submit a first article unless it is specifically waived in the contract (see 4.4, 6.2, and 6.4). requirements shall be waived without review and approval by the Procuring Contracting Officer (see 6.
20、5). No first article 3.2.1 Marking. When specified, marking shall be in accordance with the requirement specified in MIL-C-13931. 3.3 Reliability, maintainability, and durability. The specified performance and design requirements result in a cannon and parts thereof having inherent reliability, main
21、tainability, and durability (see Appendix B). 3.4 Functioning. All parts shall function smoothly without interference, erratic movement or malfunction at the maximum loading elevation of 16 degrees above the horizontal plane. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted wit
22、hout license from IHS-,-,-I MIL-C-70822 LO 7779906 0358053 7 I MI . -C - 70822 ( AR 3.4.1 Breech mechanism. Camming of the operating crank during counter-recoil or rotatinq the operating handle rearward and to the right shall force the breechbiock operating-rack downward and to the right: breechbloc
23、k to rotate counterclockwise to disengage the sectored threads. time sufficient force shall be exerted, through action of the operating crank, to overcome the carrier-1 atching plungers thereby re1 easing the pl ungers from the catches attached to the breechring and in turn allowing the carrier and
24、breechblock assembly to sw5ng to the open position. retained in the open position by means external to the cannon (engagement of the operating crank roller in the operating cam of the mount). 3.4.2 Breech closing. With the adjustor set on the minimum preload position and the cannon at the maximum lo
25、ading elevation (16 degrees), closing of the breech shall be accomplished by lifting the operating-cam of the mount clear of the operating crank rollers. Release of the crank shall allow the torsion springs to drive the crank clockwise and forcibly return the breechblock and carrier to the closed po
26、sition. rack shall rotate the breechblock clockwise to engage the sectored threads. If the breech fails to close fully, manual closing shall be accomplished by engaging the clutch in the notch of the operating crank assembly and rotating the operating handle to the left and forward. The operating ha
27、ndle shall latch in the closed posi tion. Counter-cl ockwi se rotation of the adj ustar shall increase the pre-1 oad on the torsion springs. This action shall cause the At this The breech mechanism shall be Action of the rack springs against the breechblock operating 3.4.3 Obturator surface. The obt
28、urator surfaces shall conform to the requirements prescribed in MIL-C-13931. 3.5 Primer headspace. the firing mechanism tray assembly and the rear face of the obturator spindle, shall be not less than 0.054 inch nor mare than 0.062 inch. Primer headspace, the distance between the front face of 3.6 F
29、iring pin protrusion and retraction. The firing pin protrusion measured from the front face of the block shall be not less than 0.114 inch and not more than 0.118 inch in the fired position. Firing pin retraction behind the front face of the block shall be not less than 0.008 inch. 3.7 Firing mechan
30、ism assembly, The firing mechanism ass.embly shall consist of a percussion type firing mechanism XM49 (11580122). 3.8 Performance. 3.8.1 High pressure resistance. The cannon, repair tubes, and muzzle brakes shall be capable of withstanding a chamber pressure of 59000 - + 2300 psi. 3.8.2 Material sou
31、ndness. After completion of acceptance testing, all parts chal 1 comply with soundness requirements specified on the appl icabl e drawings. 3.8.3 Bore enlargement. Bore diameters across lands, after fi.ring no more than 15 rounds, shall not exceed the before firing diameters by more than the amounhs
32、 shown in Table I. 4 Y Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70822 (AR) TABLE I. Bore enlargement. Distance forward of Commencement of ri fl i ng 0.10 inch 1 inch 1 cal. 2 cal. to muz. Amount in inches O. 008 O, 008 O. 006 O. 004 NOTE
33、: 1 i sted. Interpol ate to determine the al 1 owabl e en1 argement between the di stances 3.8.4 Firing mechanism assembly. The firing mechanism assembly shall operate wi ttiout evidence of interference, erratic movement, or rnal function. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspe
34、ction. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements (examinations and tests) as specified herein. otherwise specified in the contract or purchase order, the contractor may use his own or any other facil
35、ities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. Government reserves the right to perform any of the inspections set forth in this specification where such inspections are deemed necessary to ensure supplies and services confor
36、m to prescribed requirements. 4.1.1 Responsibility for compliance. All items shall meet all requirements of sections 3 and 5. part of the contractors overall inspection system or quality program. absence of any inspection requirements in the specification shall. not relieve the contractor of the res
37、ponsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling inspection, as part of manufacturing operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authoriz
38、e submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material. Except as The The inspection set forth in this specification shall become a The 4.2 Classification of inspections. The inspection requirements specified herein are cl
39、assified as follows: a. First article inspection (see 4.4). b. Quality conformance inspection (see 4.7). 4.3 Inspection conditions. Unless otherwise specified, all inspections shall be performed in accordance with the test conditions specified in the applicable test document, applicable paragraph(s1
40、 in the specification, or in the applicable drawing (see 4.7). 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L-C-70822 ( AR) 4.4 First article inspection. 6.21, first article items shall be submitted for inspection in accordance with QAP-APPEN
41、DIX-WVA and applicable ITEM QAPs. representati ve of the production processes used during quantity production. Quality Assurance Provisions (QAPs) are listed in Master LQAP 11580150. First article quantities are specified in the applicable item QAPs. 4.5 First Article - Initial Production Test (FA-I
42、PT). and test methods for FA-IPT are contained in APPENDIX A. Unless otherwise specified in the contract (see First article items shall be The requirements, tests, 4.6 Reliability, maintainability, and durability. The requirements, tests, and test methods for reliability, maintainability, and durabi
43、lity are contained in APPENDIX B. 4.7 Quality conformance inspection. 4.7.1 conformance to the requirements of this specification, to MIL-C-13931, QAPs listed in Master LQAP 11580150 and QAP-APPENDIX-WVA. Inspection provisions. Cannon and parts thereof shall be inspected for 4.7.2 Inspection approva
44、l stamp, The application of the inspection approval stamp shall be as specified in MIL-C-13931. 4.7.3 In spec ti on equi pmen t. 4.7.3.1 Acqui si ti on, maintenance, and di sposi ti on. (see 6.2), responsibility for acquisition, maintenance, and disposition of inspection equipment listed in List of
45、Inspection Equipment DL 11580150, shall be in accordance with MIL-1-45607. Un1 ess otherwise speci fi ed 4.7.3.2 Accuracy of commercial inspection equipment. When commercial and modified commercial inspection epuipment is used, it shall be capable of repeti- tive measurements to an accuracy of 10 pe
46、rcent of the total tolerance of the characteristic being inspected, 4.7.3.2.1 Accuracy of proof pressure measuring devices. The devices for measuring proof firing pressures shall have the following accuracy: Device Maximum error of measurement copper crusher gages - t 3% of reading pressure transduc
47、ers - t 2% of reading 4.7.4 Examinations. 4.7.4.1 Primer headspace. The primer headspeace shall be gaged on each cannon with gage prescribed in applicable item QAP, or+ with Government approved equivalent gage. Failure to comply with the requirements of 3.5 shall be cause for rejection. 6 Provided b
48、y IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70822 10 m 7777906 0358056 2 m MIL-C-70822 (AR) 4.7.4.2 Firing pin protrusion and retraction. Firing pin protrusion and retraction shall be gaged on each cannon. with gages prescribed in applicable item QAP
49、, or with Government approved equivalent gage. requirements of 3.6 shall be cause for rejection. Failure to comply with the 4.7.4.3 Material soundness. 4.7.4.3.1 Tube. Each tube shall be magnetic particle inspected in accordance with applica6le drawings, QAPs, and specifications. A borescope shall be used during inspection of the tube bore. for re j ec ti on Failure to comply with 3.8.2 shall be cause 4.7.4.3.2 Breech, evacuato
