1、/ MIL-B-37233A 75 9797706 0337340 O MIL-B- 19231A (OS) 7 September I972 SUPERSEDING See Section 6 MILITARY SPECIFICATION BARS, COPPER, SILVER-BEARING (FOR COMMUTATORS) This specification has been approved by the Naval Ordnance Systems Command, Department of the Navy. 1. SCOPE 1.1 This specification
2、describes the requirements for the procurement of silver-bearing copper bars for fabrication into commutator bars. (See 6.1.) 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date of invita- tion for bids or request for proposal, form a part of this specification to the
3、extent specified herein. STANDARDS Fe dera 1 *FED-STD- 15 1 Military MIL-STD-105 Metals ; Test Methods Sampling Procedures and Tab les for Inspection by Attributes MI L - STD - 1 2 9 (Copies of specifications, standards, drawings, and publications, Marking for Shipment and Storage required by spplie
4、rs in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting of fi Cer. ) I FSC 95301 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2.2 Other publications, The following docum
5、ents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on date 0% invitation for bids or reguest for proposai shall apply, American Society for Testing and Materials (ASTM) Standards *E 18 Rockwell Hardness and Rockwell Superficial Hard
6、ness of Metallic Materials, Tests for *B 193 Resistivity of Electrical Conductor Materials, Test for (Applications for copies should be addressed to the American Society for Testing and Materials, 1916 Race St., Philadelphia, Pa. 19103,) 3. REQUIREMENTS “3.1 Manufacture. Bars shall be manufactured b
7、y hot working and shall be finished by such cold rolling or cold drawing, including straightening, as may be required to produce material conforming to the requirements of this specification. 3,2 Chemical composition. *3,2,1 Copper. The bars shall contain not less than 99.90 percent copper (includin
8、g si lver) , 3.2.2 Silver. The bars shall contain not less than 0.085 percent silver (25 Troy ounces per ton). 3.3 Shape. The cross section of the bars shall be that of a wedge, or segmental section, having planar sides and edges. be substantially parallel to each other and perpendicular to the plan
9、e passing midway between the two sides. the surfaces is shown below, applicable drawings, contract, or order. The edges shall Dimensions shall be as specified on the A representative section defining _ 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
10、,-MIL-B-37233A 75 7777906 0337342 4 W MIL-B- 19231A (OS) Edge Thickness 2 Side s 5 Thickness Edge *3.4 Resistivity. Resistivity at 20“ centigrade (C) (68“ Fahrenheit (F) shall not exceed 875.2 ohm-pounds per square mile (conductivity 100% IACS minimum at 20“ C). 3.5 Hardness. The hardness at any poi
11、nt on the surface of the bars shall be not less than the amount shown in table I. *Table I ROCKWELL B HARDNESS Thickness, thick edge (inch) Hardness (minimum) Up to 0.250 incl. 35 Over 0.250 27 3.6 Dimens i onal vari at ions . 3.6.1 Thickness. shall not vary from the specified thickness by more than
12、 IO.001 inch, regardless of width, The thickness at points O ,250 inch from either edge 3.6.2 Width. Unless otherwise specified on the applicable drawings, contract, or order, the width of the bars shall be within the limits given in table II. 3.6.3 Length. Bars shall be furnished in lengths of at l
13、east 6 feet but not exceeding 14 feet. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-19231A (OS) Table II WIDTH TOLERANCE Width (inch) Permissible tolerance (inch) Plus I Minus up to 1800 O ,008 o ,005 Over 1.00 to 2,50 incl. o ,010 0.005 Ove
14、r 2.50 0,015 o ,010 3,6,4 Concavity. The concavity at any point on one side of a bar shall not exceed O ,001 inch. *3,6,5 Convexity. The total convexity of both sides of a bar at any point shall not exceed 0,001 inch, 3,7 Workmanship. The bars shall be uniform in quality and temper and shall be clea
15、n and smooth, free from foreign material, pipes, slivers, lags, cracks, seams, scale, burrs, damaged edges, and any other defects which might render them unfit for the usage intended, 4, QUALITY ASSURANCE PROVISIONS 4,l Responsibility for inspection. Unless otherwise specified in the contract or pur
16、chase order, the supplier is responsible for the perfor- mance of all inspection requirements as specified herein. otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspec- tion requirements specified herein, unless
17、 disapproved by the Government, The Government reserves the right to perform any of the inspections set forth in this specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements, Except as *4,2 - Lot. Unless otherwise specified, a lot
18、shall consist of 10,000 pounds or fraction thereof of material from the same heat and manufactured by the same process and shall be of the same form, size, and temper, submitted for inspection at one time. “4.3 Sampling. Unless otherwise specified, and when applicable, sampling plans and procedures
19、shall be in accordance with the provisions Of MIL-STD-105, 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-11723LA 75 M 777770b 01137345 T MIL-B
20、- 19231A (OS) 6, NOTES 6.1 Intended use, Bars furnished under this specification are intended for use in commutators for torpedo motors. *6,2 Ordering data. Unless otherwise specified, procurement documents should specify title, number, and date of this specification and excep- tions to this specifi
21、cation and applicable documents. bars shall be specified in the contract or order, or on the applicable drawings referenced therein. Dimensions of *6,3 Supersession data, This specification includes the requirements of MIL-B-19231 (Nord) dated 30 December 1955, issued in lieu of NAVORD OS 3292, and
22、Amendment 1, dated 22 May 1958. When drawings etc. refer to NAVORD OS 3292, this specification applies, *6,4 The margins of this specification are marked with an asterisk to indicate where changes (additions, modifications, corrections, deletions) from the previous issue were made. This was done as
23、a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations, Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespec- tive of the marginal notations and relationship to the last previous issue, Custodian: Navy - OS Preparing activity: (Project No. 9530-NOlO) Navy - OS *US. GOVERNMENT PRINTING OFFICE:1972-714-537/1432 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
