1、 MIL-P-70524 (7 1 U O6 2046062 628 D I INCH- PO MIL-P-70524 (AR) AMENDMENT 7 30 May 1997 SUPERSEDING AMENDMENT 6 16 May 1996 MILITARY SPECIFICATION PROJECTILE, 105MM, HE, RA, XM913/XM927 WARHEAD INSULATION ASSEMBLY FOR This amendment forms a part of Military Specification MIL-P-70524 (AR), dated 29
2、October 1990, and is approved for use by the U.S. Army Armaments, Research, Development and Engineering Center and is available for use by all Departments and Agencies of the Department of Defense. PAGE 1 Title: change “XM913” .to M913” (and wherever it appears). PAGE 3 3.5 Delete in its entirely an
3、d substitute the following: “3.5 Proving ground. There shall be no warhead related premature explosive function, warhead breakup or separation of metal parts in the gun bore or in flight, when tested as specified in 4.5.8. I PAGE 4 * 3.7.1 Line 2, Delete ”100 pounds” and substitute “5000 pounds”. *
4、3.7.2 Delete in its entirety without substitution. (Note, 3.7.2 was added in amendment 6 and deleted in amendment 7) PAGE 7 4.3.1.2 Delete in its entirety. AMSC N/A 1 of 5 FSC 1315 DISTRIBUTION STAT-NT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reprodu
5、ction or networking permitted without license from IHS-,-,- MIL-P-70524 (7) Ob 204bOb3 5b4 MIL-P-70524 (AR) AMEND= 7 PAGE 8 TABLE 1, Warhead insulation and assv. Delete 9341144“ and substitute 9381144“. Warhead (prior to knurlins and threadinq) Delete “4.4.2“ and substitute “4.4.2.2“. Insulation, Bo
6、nding Assembly Pull Test: Delete 25“ and substitute 5“. Delete 4.5“ and substitute 4.5.7“. PAGE 12 4.4 -2.2 Special 1: Delete 3.9“ and substitute“3.11“. PAGE 15 4.4.2.3 Major defect 118, Delete “Effective“ and substitute “Thru“. Major defect 123, change Surface finish of base thread“ to Surface fini
7、sh of base thread undercut“. PAGE 17 4.4.2.4 Special defect 1 Delete 3.5“ and substitute “3.6“. Special defect 2 Delete “3.7“ and substitute “3.9“. Major defect 103 Delete “3 -7“ and substitute “3.9“. PAGE 21 * 4.4.2.7 Major defect 101, change “Insulation of adhesive above minimum recess: to “Insula
8、tion or adhesive above drawing requirement“. Major defect 102, delete “Ultraviolet light“. Add Major defect 103, as follows: “103, Bonding assembly pull test, 4.4.6, 3.7.1, 4.5.7“. PAGE 23 * 4.4.3.5 Delete in its entirety without substitution. (Note, 4.4.3.5 was added in amendment 6 and deleted in a
9、mendment 7 ) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-P-70524 (7 1 9999906 2046064 4T0 MIL-P-70524 (AR) AMENDMENT 7 PAGE 24 Add New paragraphs 4.4.6, 4.4.6.1 and 4.4.6.2. 4.4.6 Bondinq assembly pull test. Sampling for the adhesive bond
10、test of the Warhead insulator assembly consists of a process qualification and a normal sampling test. Testing shall be performed as specified in 4.5.7. qualification test shall be performed when any of the following conditions exists: The process a. The start of production. b. c. d. The bonding pro
11、cess (which includes surface preparation, e. A lapse in production has exceeded one month. f. A failure has occurred during normal sampling. The lot of adhesive resin or hardener changes. mixing of adhesive, application of adhesive, fixturing and curing conditions) changes. As part of first article
12、inspection. 4.4.6.1 Process aualification sarmlinq. A random sample of five warhead bonding assemblies shall be taken from the initial days production for testing. fails to comply with the requirements of 3.7.1, the production quantity represented by that sample shall be rejected, the process correc
13、ted and an additional sample selected. If any test sample 4.4.6.2 Normal samDlinq. Once qualified per 4.4.6.1, from each days bonding production, the contractor shall have one each assembly selected at random for testing. If any test sample fails to comply with the requirements of 3.7.1, the product
14、ion quantity represented by that sample shall be rejected and the inspection sampling will revert back to 4.4.6.1 once corrective action has been taken on the process.“ 4.5.2 Delete 3.5.3“ and substitute “3.6.3“. PAGE 28 4.5.6.2 Line 12, Delete 3.13“ and substitute 3.8“. PAGE 29 * 4.5.7 Delete in it
15、s entirety and substitute the following: 4.5.7 Bondina assembly pull test. Samples selected for this test shall be held until completion of the production Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-P-70524 (7) Ob 2046065 337 MIL-P-70524 (AR
16、) AMENDMENT 7 adhesive cure cycle. Each sample shall have a pull test fixture bonded directly onto the exterior surface of the insulator (see 6.12). The sample assemblies shall be temperature conditioned at +140 degree F min. for 16 hours minimum prior to testing. Each test sample shall be pull (ten
17、sion) tested within 15 minutes after removal from the conditioning chamber. The test fixture is to be designed in accordance with 4.4.4. Observation shall be made for compliance with requirements of 3.7.1. If the bond breaks at the fixture, it will be counted as a successful test providing the tensi
18、on force is above the requirement of 3.7.1. If the bond breaks at the fixture with a lower tension value, it will be considered as a no test and another test sample must be selected. All test samples must have a new insulator bonded onto its base before returning it to the lot. *I 4.5.8 Delete in it
19、s entirety and substitute the following: “4.5.8 Provinu around. These tests shall be performed at a Government proving ground in accordance with the applicable acceptance test procedure. The sample warheads selected in accordance with 4.4.5 shall be TNT loaded, assembled with live rocket motors and
20、delay assemblies, and conditioned to 145-5 degrees F for 16 hours minimum prior to firing rocket on in a M119 series howitzer using a PXR2OO propelling charge conditioned to 70+/-2.5 degrees F. The warheads shall be fuzed with M577 series MTSQ fuzes set to 40 seconds minimum. Photographic and radar
21、coverage shall be provided to assure compliance with 3.5. Range and deflection shall be recorded for informational purposes only.” * 4.5.9 Delete in its entirety without substitution. (Note 4.5.9 was added in amendment 6 and deleted in amendment 7) 5.1 Delete in its entirety and substitute the follo
22、wing: “5.1 Packacrina, r ackincr and markinq. Packaging, packing and marking shall be in accordance with MIL-STD-1169, Level C. Appropriate cushioning or partitions shall be provided to protect the items from contacting each other during shipment. Sufficient fillers must be used to insure a tight pa
23、ck. Adequate corrosion protection shall be provided if required.” 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-6. rn 9999906 204bObb 273 rn MIL-P-70524 (AR) AMENDMENT 7 PAGE 30 Line 3, Delete “4.4.3.3“ and substitute “4.4.5“. Line 5, Delete “3.6
24、. “ and substitute “3.5“. PAGE 32 Add new paragraph 6.12 “6.12 Bondincr assembly pull test - recommended fixture. Since there is not a convenient physical way to grasp the insulator, an adapter must be bonded to the insulator for the pull test. This requires that the insulator top surface be roughen
25、ed in order to bond the adapter. its base slightly smaller than the insulator diameter. The adapter base must also be grooved and roughened to obtain a good bond. The top of the adapter must be threaded at its exact center to accept the pull test equipment fixturing. The insulator must be pulled squ
26、arely due to the peeling affects of the adhesive*otherwise a lower pull value may be obtained. The epoxy that has been successfully used to bond the adapter is “DEVCON five minute epoxy“. The assembly is allowed to cure from 1 to 3 hours before the warhead/ insulator assembly is temperature conditio
27、ned. The above assembly is held in a Tinius Olsen (Tension tester) by a fixture that threads into the forward end of the warhead and the upper end is threaded into the fixture adapter. The tester is set at a cross head rate of l“/min. with a full scale (12000 pounds) to perform test. The adapter mus
28、t have The margins of this amendment are marked with an asterisk or vertical lines to indicate where changes, modifications, corrections, deletions) I from the previous amendment were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in
29、 these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous amendment. (additions, Custodian: Amy-AR Preparing activity: Amy-AR ( Pro j ec t 13 15 - O 15 6 ) 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
