 |
|||
|
|
|||
| ||||||||||
|
| MIL-C-60570B
Primers are to the left mounted to the boards or trays until after the x-rays have been reviewed and defects
identified to facilitate removal of defective units. After screening, the x-ray negatives, with defectives
identified, shall be forwarded to the engineering activity designated by the acquiring activity. Interpretation
of the radiographic films shall verify the following:
Presence of Primer Charge
No Material Defects
4.7.2 Hardness. Ten units from each heat-treated lot of components shall be tested with a hardness
tester. Failure of a unit to comply with the requirements of the drawings shall be cause for rejection of the lot
of components.
4.7.3 Protective finish. Unless otherwise specified (see 6.2), sampling plans and procedures in the
determination of acceptability of coated parts shall be in accordance with the provisions set forth in MIL-C-
60539.
4.7.4 Radiographic examination. All assembled cartridges shall be radiographically examined in
accordance with MIL-STD-453. The cartridges shall be positioned on their sides for the most revealing
exposure. All cartridges shall be identified with serial numbers prior to examination. The serial numbers shall
be in consecutive order beginning with the number 001 in each production lot. The cartridges shall be
arranged on trays or boards in consecutive numerical order, and each radiograph shall carry a permanent
identification of the cartridges displayed thereon. The radiograph plate identification shall include item
nomenclature, the complete lot number as stamped on the cartridges, the span of serial numbers displayed, and
the contract number. Cartridges having any observable imperfections in assembly shall be cause for rejection.
Radiographs of the entire production lot shall accompany the ballistic sample to the activity conducting the
production lot acceptance test. Discontinuities in serial numbers shall be identified on the x-ray negative.
Defective cartridges, found by the contractor, shall be clearly identified on the negative and those defectives
removed from the production lot. The serial numbers shall be pen or ink stamped on the cartridge with
approximately 1/8 inch-high characters. The serial numbers shall be located apart form the other cartridge
markings (see 6.2).
4.7.5 Airtightness. Each cartridge shall be subjected to specified pressure differential. The method for
determining airtightness shall be with a helium mass spectrometer. The helium leak rate shall be converted
to standard cubic centimeters air. Failure to comply with the requirements of 3.5.2 shall be cause for rejection
of the cartridge.
4.7.6 Sealant application. Five cartridges for first article inspection shall be disassembled in such a
manner that determination can be made that the sealant has been properly applied for the full length of the
joining surfaces at the junction of the sealing disc and case sidewall and that the propellant cavity is free of
sealant.
4.7.7 Vibration test. Twelve of the 21 assembled cartridges of the first article sample, x-rayed as
directed in 4.7.4, properly identified, shall be subjected to vibration. The method and procedures for
performing the vibration test shall be in accordance with MIL-STD-810, Method 514.3, Test Procedure I, Test
Condition I-3.2.5 (see 6.2). Then the 12 vibrated cartridges shall be x-rayed again. Evidence of any
10
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals