NAVY MIL-P-19419 A-1960 PLATING CHROMIUM ELECTRO-DEPOSITED (ON THE INTERIOR SURFACES OF 20 MM MARK 11 GUN BARRELS)《内部表面20毫米 11个标号的炮膛的镀铬电沉积》.pdf
《NAVY MIL-P-19419 A-1960 PLATING CHROMIUM ELECTRO-DEPOSITED (ON THE INTERIOR SURFACES OF 20 MM MARK 11 GUN BARRELS)《内部表面20毫米 11个标号的炮膛的镀铬电沉积》.pdf》由会员分享,可在线阅读,更多相关《NAVY MIL-P-19419 A-1960 PLATING CHROMIUM ELECTRO-DEPOSITED (ON THE INTERIOR SURFACES OF 20 MM MARK 11 GUN BARRELS)《内部表面20毫米 11个标号的炮膛的镀铬电沉积》.pdf(22页珍藏版)》请在麦多课文档分享上搜索。
1、PLATING CHROMIUM, ELECTRO-DEPOSITED (h TiE INTERIOR SURFACES OF 20 MM MARK 11 GUN BAEELS) This specificatson has been approved by the Breau of Naval Weapons, Department of the Navy. 1. SCOPE 1.1 This specification presents detailed requirements for high contraction electrodeposited chromium plating
2、on the bores, grooves, and chambers of 2Omm Mark 11 Gun Barrels. 1.2 The requirements apply to 2Omm Mark 11 Gun Barrels whose Interior, surfaces have not been nitrided prior to plating 2. APPLICABLE DOCUMENTS 2.1 The following specifications, standards, and publica- tions of the issue in effect on t
3、he date of Invitation for bids, form a part of this specification. SPECIFICATIONS MILITARY MIL-L-3150 - Lubricating oil, preservative medium. MIL-C-16173 - Corro3lon Preventive, Solvent Cutback, Cold Application STANDARDS FEDERAL TED-SPD-151 - Metals; Test Nethods /- t_ THIS DOCUMENT CONTAINS 22 PAG
4、ES. 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-LSqLSA LO 777770b 0300348 O -STD-lOCj - Sampling Procedures and Tables for Inspec- MIL-STD-129 - Marking for Shipment and Storage. tion by. Attributes . PUBLICATIONS OP 400 - General Instruc
5、tions for the Design, Manufac- OP li05 - Preservation and Preservation Maintenance of ture, and Inspection of Naval Ordnance Equip- ment . Ordnance Equipment in Shore Storage. (Copies of specifications, standards, drawings, and publlca- tions required by contractors in connection with specific pro-
6、curement functions should be obtained from the procuring agency or as directed by the contracting officer.) 3. REQUIREMENTS 3.1 E ui ment. - Equipment for performing the chromium plating -9-E-6- opera ions shall be furnished by the contractor 8ub3aot to Che approval of the procuring activity. 3.2 Ma
7、terial. - 3.2.1 Basic material. - The basic material QT the_ POmmMark 11 Oun Barrel shall be of a quality, composition, and having the physical properties in accordance with the detail specifi- cations for the part. to affect only the surface properties of the interior of the barrel (i. e., hardness
8、, resistance to wear, erosion, corro- sion, and coefficient of friction). Plating with chromium shall be considered 3.2.1.1 Surface finish. - All interior surfaces of the pits, gouges, flakes, slivers, corrosion, or any other surface defects that would affect the application or the performance of th
9、e chromium plate. The surface roughness of the interior surfaces prior to plating shall conform to the applicable drawing requirements for surface roughness after plating. .barrel shall be substantially free fmm tool marks, cracks, P -. 2 Provided by IHSNot for ResaleNo reproduction or networking pe
10、rmitted without license from IHS-,-,-i . MIL-P-194L9A LO m 9999906 0300349 2 MIL-P-19419A (Wep), 3.2.1.2 Protection after machining. - After the final ma- chining operation, both the interior and exterior surfaces of the barrel shall be cleaned to insure removal of all cut- ting oil and other foreig
11、n matter. Immediately following inssection, these surfaces shall be coated with Lubricating Oil, Preservative, Medium, Specification MIL-L-3150, for the protection of all surfaces until the barrels are chromium plated. 3.3 Interior dimensions of the gun barrel before plating and before electropolish
12、ing. - 3.3.1 Removal of metal. - The required interior dimensions of the gun barrel before plating shall be obtained by electro- polishing, by mechanical removal of metal, or by a combination of mechanical removal of metal and electropolishing as speci- fied in the applicable drawings. 3.3.2 Before
13、plating. - The interior dimensions-of the gun barrels before chromium plating shall be such that the barrel dimensions will conform to the drawing dimensions within the prescribed tolerances after plating with the required thick- ness of chromium plate. 3.3.3 Before electropolishing. - The interior
14、dimensions of the gun barrel before electropolishing and chromium plating shall be such that the barrel dimensions will conform to the drawing dimensions within the prescribed tolerances, after removal of the specified amount of metal by electropolishing and plating with the required thickness of ch
15、romiiun plate. . 3.4 Chromium deposit. - 3.4.1 Thickness of deposit. - The thickness of the chromium deFosit on the top of the lands, and in the chamber shall be as specified in the applicable drawings. 3.4.2 Appearance of the depcsit after plating. - The chromium deposit as plated shall be smooth a
16、nd homogeneous. The eposit shall be bright on the tops of the lands but a somewhat dull or- slightly milky deposit in the grooves shall not be cause for rejection. “Burnt and “frosty“ deposits are unacceptable. The deposit shall be free from visible defects, such as unplated areas, blisters, flaking
17、, trees, cracks, pits, and gouges, in accordance with the acceptance standard gf this specification (see appendix). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.5 Interior dimensions of the gun barrel after platinq. The interior dimensions of th
18、e bore, grooves, and chamber after Dlating shall conform to drawing dimensions within the prescribed tolerances , 3.5.1 hlechanical sizing . - Mechanical honing or similar operations shall not be performed on the tops of the lands to bring the dimensions of an undersize bore Nithin drawing dimen- si
19、6nsi sines sch opersticfis praduce sharp cages at the corners of the lands which are easily broken by the honing operation itself or by subsequent firing. operations are permitted in the chamber (where no edges are present) to attain proper size dimensions. Mechanical honing or similar 3.6 Records.
20、- The following data for each gun barrel cov- dimensional ered by this specification shall be recorded and retained until after completion of proof or firing tests: measurements, results of visual examination, and operating conditions for electropolishing and plating. 3.7 Firing test requirements. -
21、 3.7.1 Proof and functional firing. -, The condition of the chromium deposit after proof firing and after functional firing shall meet the requirements of the applicable 2Omm Aircraft Gun Mk 12 Specification when judged in accordance with accept- ance standard of this specification (see appendix). 3
22、.7.1.1 Life firing tests, - The performance of the chromim plated barrel during life firing tests shall conform to the requirements of the applicable 2mm Aircraft Gun Mk 12 Specifi- cations , 4. QUALITY ASSURANCE PROVISIONS 4.J General. - General inspection and test procedures shall be in aucor.danc
23、e with Federal Standard FED-STD-151, Metals; Test Methods, and Publication .OP 400. 4.1.1 Sampling. - Unless otherwise specified, and when ap- plicable, the sampling plans and procedures used by the govern- ment inspector in the determination of the acceptability of products submitted by a supplier
24、for Government inspection shall be in accordance with the provisions of MU-STD-105, 4.1.2 Government Inspection, - The government inspector will make such inspections as are necessary to determine that all components and assemblies are in accordance with the require- ments of the contract, pertinent
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