1、MIL-C-49514 999990b 18513153 BOL 1 INCH-POUND I MIL-C-49514 16 February 1993 MILITARY SPECIFICATION COPPER CRUSHER SPHERES FOR CANNON AND MORTAR PRESSURE GAUGES, GENERAL SPECIFICATION FOR This specification is approved for use by the U.S. Army Test and Evaluation Command based upon currently availab
2、le technical information, and is available for use by ail Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Sco-pe, This specification covers copper crusher spheres for use in crusher gauges, primarily intended for use in measuring pressures in weapons. 2. APPLICABLE DOCUMENTS 2.1
3、Government Documents. The following documents form a part of this specification. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be used in improving this document should be addressed to Commander, U.S. Army Test and Evaluation Command, Directorate for Te
4、chnology, Technology Development Division, AMSTE-TC-D, APG, MD 21005-5055, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC NIA FSC 1090 DISTRIBUTION STATEMENT A. Approved for public release; distribution unlimited. Li
5、censed by Information Handling ServicesMIL-C-49514 9 9999906 1651364 748 9 MIL-C-495 14 2.1.1 Specifications. standards and handbooks. STANDARDS FEDERAL Fed. Test Method Std. NO. 151b - Metals; Test Methods MILITARY MIL-STD- 105 - Sampling Procedures and Tables for Inspection by Attributes MIL-STD-
6、129 - Marking for Shipment and Storage (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.) 2.1.2 Other government documents.
7、QSTAG-607 - Crusher-Type Pressure Gauges for Measurements of Gun and Mortar Pressures. 2.2 Non-Government Dublicabons. The following documents form a part of this specification unless otherwise indicated in the invitation for bids. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) STANDARDS ASTM B 1
8、70 - Oxygen-Free Electrolytic Copper - Refinery Shapes ASTM B 193 - Resistivity of Electrical Conductor Materials ASTM E8 - Tension Testing of Metallic Materials ASTM El 12 - Determining Average Grain Size (Application for copies should be addressed to the American Society for Testing and Materials,
9、 1916 Race Street, Philadelphia, PA 19103.) 2 Licensed by Information Handling ServicesTechnid MIL-C-49514 W 999990b 1851385 684 MIL-C-49514 ciety and technical association specifications and standards re generally available for reference in libraries. They are also distributed among technical group
10、s and using Federal agencies. 3. REQUIREMENTS 3.1 Material. The starting material for copper crushers shall be wire coil stock ranging in diameter from 0.1340 to 0.1360 in. and in grain size from 0.015 to 0.035mm. 3.1.1 Workmanship. Wire coil stock used for copper crushers shall be hard drawn and be
11、 free from seams, draw scratches and flaws. 3.2 Chemical comtiosition. Chemical composition for crushers shall be within the limits of ASTM B 170 for grade 1 copper. Chemistry of all residuals, including silver and oxygen, is to be quantitatively identified by the contractor and a certified analysis
12、 is to be provided to the Government. 3.3 Mechanical gromrties. Unless otherwise specified in the contract or order, the mechanical properties of wire coil stock shall have a minimum tensile strength of 3.8 x 1VkPa (55,000 psi) and a 1 % minimum elongation in a 25cm (10 inch) gauge length. Tensile p
13、roperties shall be measured according to Federal Test Method Std. No. 15 1 b. 3.4 Resistivity. The resistivity at 20C of copper (annealed) shall not exceed 0.15176 ohm-grams/m* as measured by the method ASTM B 193. 3.5 Heat treatment. Crushers shall be bright annealed. The depth of cold work in crus
14、hers shall not exceed 0.0015 inch (see 6.2). 3.6 Dimensions and Tolerances. 3.6.1 Dimensions. Crushers shali comply with the dimensions specified in Figure 1 in the Appendix. 3.6.2 Weight. Crushers shall not weigh less than OSO00 grams. 3.7 Processing Controls. 3.7.1 Cop-wr Crushers. The method of m
15、anufacture shall adhere to best commercial practice and, unless specified in the contract, follow the steps outlined below. Step 1. Receiving. A. Veri weight, coil and lot (see 6.1) identification. 3 Licensed by Information Handling ServicesStep 2. Heading. MIL-C-49514 W 999990b L85L3b 510 MIL-C-495
16、 14 B. Tag each coil by number 1, 2, 3, etc. C. Cut a 60cm (2 fi) sample from each end of each coil and identify with coil and lot numbers. D. Submit samples of coil ends identified by coil and lot numbers to Government contracting officers representative for examination and analysis in accordance w
17、ith 3.1 through 3.4. E. Hold the material in Receiving until released by the Government contracting officers representative. A. Head to size - 0.194“ - 0.198“ B. Send a minimum of 12 sample headed balls from each coil identified by coil and lot numbers to the Government contracting officers represen
18、tative for evaluation and approval (see 6.4). Step 3. Flash. Flash to remove trace of equator and poles. Step 4. Rough grind. A. Grind to 0.189 - 0.190“ with Stone Lap. B. Barrel clean and dry to remove oil. Step 5. Finish grind. Grind to 0.188“ with Stone Lap. Step 6. Barrel. A. Barrel finish in he
19、avy slurry of Maizo/Lime Size “Std. to + 0.0002.“ B. Send a minimum of 12 sample barrel finished balls from each coil identified by coil and lot numbers to Government contracting officers representative for examination and approval. Step 7. Heat treat. Bright anneal at 402C for one-half hour. The fu
20、rnace charge shall not exceed 60 lb. The furnace temperature shall be closely controlled. Heat treat furnace recorder must be calibrated to an accuracy of at least +/- 1 % of scale reading. After heat treatment and metal 4 Licensed by Information Handling ServicesMIL-C-49534 m 999990b 3853387 457 m
21、MIL-C-495 14 processing, the annealed crushers shall show a grain size between 0.015mm and 0.035mm. Record of the date, temperature, and duration of the anneal of each batch (see 6.2) of crushers processed shall be furnished to the Government by the contractor. An additional thermocouple shall be pl
22、aced at the geometric center of the furnace charge during anneal of at least the first batch of crushers. Response from this thermocouple shall be used to ensure the required time (30 minutes) at temperature (402C). If a standard geometric configuration can be maintained for each successive furnace
23、charge and once correlation has been established, use of the monitoring thermocouple at the center of the charge may be discontinued. Step 8. Barrel dip. Use a 20% solution of phosphoric acid. Barrel finish to 0.1870“ - 0.1875.“ Step 9. Inspection. Conduct a 100% inspection for visual defects. Any v
24、isible surface blemish shall be cause for rejection. Step 10. Pack and Ship. See Section 5. 3.8 Tarage table. The appropriate tarage table or tables for reading the pressures of crushers shall be constructed after first consulting U.S. Army Combat Systems Test Activity, Aberdeen Proving Ground, Mary
25、land (see 6.6). 3.8.1 Government generated tarage tables. The Government reserves the right to generate its own tarage table or tables when crushers are used in the testing and certification of Army weapons. This specification does not obligate the Government to accept tarage tables prepared by the
26、manufacturer, his agent or contractor. 3.8.2 Ouadripartite Standardization Agreement - 607. The U.S. has ratified QSTAG 607 “Crusher - Type Pressure Gauges for Measurement of Gun and Mortar Pressures“ which is available from the Primary Standardization Office, Park Center II, Suite 275, 4401 Ford Av
27、enue, Alexandria, VA 22302-1401; telephone (703) 756-1376. Crusher gauges will be used and calibrated in accordance with procedures outlined in this QSTAG whenever the pressure data are to be passed on to Australia, Canada, or the United Kingdom. 5 Licensed by Information Handling ServicesMIL-C-4951
28、4 m 999990b 1851388 393 m c MIL-C-495 14 4. QUALITY ASSURANCE PROVISIONS 4.1 ResDonsibilitv for insoection. 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. Exc
29、ept as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections
30、 set forth in this specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. 4.1.1 ResDonsibility for compliance. All items shall meet all requirements of sections 3, 4, and 5. The inspection set forth in this specification shall be
31、come a part of the contractors overall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all req
32、uirements of the contract. Sampling inspections, as part of manufacturing operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the government to accept d
33、efective material. 4.2 Packag.ing insDection. The items shall be inspected before and after packaging to determine compliance with the preservation, packaging, packing and marking requirements specified in Section 5 herein. 4.3 Method of inspection and test. 4.3.1 Material. Prior history of ail the
34、copper wire coil, as delivered to the manufacturers plant by his suppler, shall be furnished to the Government contracting officers representative for technical review and approval before processing the wire into copper spheres. The purpose of this review is to provide assurance that the wire bars f
35、rom which the wire was made all have the same basic chemical composition, the same heat treatment at the same facility, and that the resulting wh-e bars are as identical as good commercial practice permits. The prior history shall include as a minimum, a certified chemistry, tensile strength, minimu
36、m elongation, resistivity and density. 4.3.2 Wire samples. Two 6Ocm (2-foot) samples (one from the beginning and one from the end of each copper wire coil) properly identified to each coil, is to be furnished the Government contracting officers representative to perform mechanical and electrical tes
37、ts and to examine grain size and orientation of grains. Experience has shown that properties from opposite ends of a coil do not normally differ significantly. 6 i Licensed by Information Handling ServicesMIL-C-49514 m 7999906 II851389 22T m First 500 Second 500 MIL-(2-495 14 Accept Reject Resample
38、500 7 11 8, 9 or 10 1000 18 19 However, if a significant (more than 5%) variation is noted, additional samples may be required from along the length of the wire. The metallurgical examination of grain size and orientation is to provide the customer or his designated representative with information o
39、n the amount and effects of cold working on the copper wire before it is subsequently processed into copper spheres. The contractor will not proceed to manufacture spheres without written approval that the property requirements for the wire have been met. 4.3.3 Wire tests. Tensile and elongation pro
40、perties shall be determined by the methods prescribed in Federal Test Method Standard No. 151b, ASTM E 8. Electrical resistivity shall be determined by the methods prescribed in Federal Test Method No. 151b, ASTM B 193. 4.3.4 Acceptance of wire. Acceptance inspection of the copper wire coils shall c
41、onsist of satisfactory completion of 4.3.1 through 4.3.3. When these steps are completed and the wire coils found acceptable, the suppler shall be notified to proceed with the processing of the wire coils into copper spheres. 4.3.5 Acceptance of spheres. 4.3.5.1 Sampling test. The spheres shall be s
42、ubmitted in batches of 30,000 to 150,000 units segregated into boxes of 2000 spheres (see 5.1). From each box of a batch, randomly select (as closely as possible) two samples of equal number of spheres such that the total number of spheres in each sample is 500. These are the test samples for gaging
43、 and weighing. Acceptheject batch criteria shall be based on adherence to MIL-STD-105 (Table III-A, AQL= 1 .O) summarized in Table 1. TABLE 1. Batch accepdreject criteria. II I Cumulative I Number of Failures II 4.3.5.2 Measurement of cold work. From a batch of 30,000 to 150,000 units randomly selec
44、t two boxes of 2000 spheres. From each box of a batch randomly select two spheres. These are the test samples for the measurement of cold work by x-ray diffraction procedures (see 6.3). 7 Licensed by Information Handling ServicesMIL-C-495L4 D 9999906 1853390 T41 D MIL-C-495 14 5. PREPARATION FOR DEL
45、IVERY 5.1 Packing. The copper pressure spheres shall be packed by the contractor, 2000 spheres to a wooden box appropriately labeled indicating quantity, size, lot number, coil number, annealing temperature and time, and year of manufacture. The wooden box shall comply with the dimensions specified
46、in Figure 2 in the Appendix. The method of packing is to sprinkle about 1/8 inch of clean, dry hardwood sawdust (or equivalent) on the bottom of the inside of the box. Four hundred spheres (the number determined by weight) are to be put irregularly into the box on top of the sawdust (or equivalent).
47、 Sufficient sawdust (or equivalent) is then sprinkled over the spheres so that they are completely covered. The layer is then covered with a cardboard sheet and the process of applying sawdust, spheres, and sawdust is repeated until 2000 spheres have been packaged. An additional cardboard sheet shou
48、ld be placed on top of the last layer of sawdust and any additional headspace in the box should be reduced to less than 1/16 inch by further insertion of sheets of cardboard. Purchase of spheres by the Government will not require tarage tables be furnished by the manufacturer (see 6.6). 5.2 Marking.
49、 Each shipping container shall be marked with the name of the material, the lot number, the diameter, the weight contained, this specification number, the name of the contractor and the number of the contract or purchase order, and in addition, shall be marked in accordance with MIL-STD-129. 6. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Definitions. 6.1.1. u. A lot shall consist of all spheres made from wire coil of one billet. Under no circumstances shall lots be mixed during any operation. 6.1.
