1、MIL-P-70505 (4) = 9999906 Lb37040 502 MIL-P-70505 (AR) AMENDMENT 4 - SUPERSEDING AMENDMENT 3 3 April 1989 MILITARY SPECIFICATION PROJECTILE, 155MM: XM864 PROPELLANT GRAIN This Amendment forms a part of Military Specification MIL-P-70505 (AR), dated 28 December 1984, and is approved for use by the US
2、 Army Armament, Munitions and Chemical Command and is available for use by all Departments and Agencies of the Department of Defense. PAGE 1 Add the designation “(M864)“ in the title and change XM864 to 2.1.1 Add the following military specifications: “M864“ wherever it appears in the specification.
3、 a* “MIL-P-4 6 9 94 - Pellets, Granules Boron/Potassium Nitrate MIL-A-70625 - Automated Acceptance Inspection Equipment for Non-Electronic Components, Design, Testing and Approval of“ PAGE 2 2.1.1 Add the following Military Standard: “MIL-STD-453 - Inspection, Radiographic“ 2.1.2 Add the following d
4、rawings: INSPECTION EQUIPMENT DRAWINGS 9880422 - Envelope Drawing Radiographic Equipment 155MM M864 Propellant Grain“. O 1 of 19 AMSC NIA mc 1320 D-2 Approved for pubiic release; distribution is uoiimittd. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
5、,-,-MIL-P-70505 (4) W 9999906 I1637041 449 W MIL-P-70505 (AR) AMENDMENT 4 2.2 Add the following new paragraphs: “2.2 Non-Government Publications. The following document(s) forms a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are
6、DoD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). ANSI Zl.1 - Guide for Quality Control Charts ANSI 21.2 - Control Chart
7、Method of Analyzing Data ANSI 21.3 - Control Chart Method to Controlling Quality During Production (Applications for copies should be addressed to American National Standards Institute, 1430 Broadway, N.Y., N.Y. 10018. )I PAGE 3 3.3 Heat of reaction. Delete “930 f. 35 cal/g“ and substitute “950 - +
8、50 cal/g“. * 3.4 Delete in its entirety and substitute the following: “3.4 Strand burnina rate. Strand burning rate tests shall be performed under the test conditions of 70QF then add 2000 (5 0.5) grams of water. Distilled water is preferred, but demineralized or tap water containing less than 250 p
9、pm of dissolved solids is satisfactory. The water temperature should be approximately 1.5 C below room temperature, but this can be varied to suit the operators preference. It is not necessary to use exactly 2000 grams, but the amount selected must be duplicated within 2 0.5 gram for each run. 4.5.1
10、2.2 Closina the Bomb. Care must be taken not to disturb the sample when moving the bomb head from the support stand to the bomb cylinder. Be sure that the contact ring is in place above the sealing ring and that the sealing ring is in good condition; then slide the head into the cylinder and push it
11、 down as far as it will go. It will be convenient (but not essential) to hold the bomb in a bench clamp during the closing and while filling the bomb with Argon. Set the screw cap on the cylinder and turn it down firmly by hand. Do not use a wrench or spanner on the cap. Hand tightening should be su
12、fficient to secure a tight seal. 4.5.12.5.3. Fillins the Bomb. Press the fitting on the end of the hose into the inlet valve socket and turn the knurled union nut finger tight. Close the valve on the filling connection; then open or “crack“ the argon tank valve not more than one- quarter turn. Open
13、the connection control valve slowly and watch the gage as the bomb pressure rises to the desired filling pressure (usually 30 atm., but never more than 40 atm); then close the control valve. The bomb inlet check valve will close automatically when the supply is off, leaving the bomb 14 Provided by I
14、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-70505 (4) m 9999706 Lb37054 OT? m MIL-P-70505 (AR) AMENDMENT 4 filled to the highest pressure indicated on the atm. gage. Fill the bomb to 30 atm. and exhaust a total of 3 times before filling to the appropria
15、te pressure for the particular sample being tested. When testing a powder or granular material, the filling and purging operation must be done very slowly so the sample will not be disturbed. Release the residual pressure in the filling hose by pushing downward on the lever attached to the relief va
16、lve. The gage should now return to zero. If the pressure drops slowly and a large amount of gas escapes when the pressure relief valve is opened, the check valve in the bomb head is not operating properly. This trouble will have to be corrected before the bomb can be used. If too much should acciden
17、tally be introduced into the bomb, do not proceed with the combustion. Detach the filling connection; exhaust the bomb, remove the head and reweigh the sample before repeating the filling operation. 4.5.12.5.4 Operation of calorimeter. Set the bucket in the calorimeter. Attach the lifting handle to
18、the two holes in the side of the screw cap and lower the bomb into the water with its feet spanning the circular boss in the bottom of the bucket. Handle the bomb carefully during this operation so that the sample will not be disturbed. Remove the handle and shake any drops of water back into the bu
19、cket; then push the two ignition lead wires into the terminal sockets on the bomb head, being careful not to remove any water from the bucket with the fingers. Close the calorimeter cover. Lower the thermometer bracket. Adjust the reading lens, and turn on the power seitch to start the motor. Let th
20、e calorimeter run for seven (7) minutes while the controller brings th4e jacket temperature up to equilibrium with the bucket. After the temperatures have equalized, vibrate the thermometer and read the bucket temperature to one-tenth of the smallest scale division. Stand back from the calorimeter a
21、nd fire the bomb by pressing the ignition button and holding it down until the indicator light goes out. Normally the light will glow for only about 1/2 second, but release the button with five (5) seconds regardless of the light. The bucket temperature will start to rise within twenty (20) seconds
22、after firing. The rise will be rapid during the first few minutes; then it will become slower as the temperature approaches a stable maximum. It is not necessary to observe temperatures during the rapid rise period since the contoller will make the adjustments needed to keep the bucket and jacket te
23、mperatures equal. Start temperature readings at about seven (7) minutes after firing, vibrating to settle the mercury 15 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-70505 (4) 999990b 1637055 T33 MIL-P-70505 (AR) AMENDMENT 4 before each obse
24、rvation. Read the thermometer at one minute intervals until the temperature reaches a stable maximum and remains constant for at least two minutes (three successive readings). Then, read and record this final temperature to one- tenth of the smallest scale division. Raise the thermometers. Swing the
25、 cover aside and lift the bucket out of the calorimeter, but let the motor continue to run while the calorimeter is open. Move the jacket temperature control to the purge position to lower the temperature to the starting point in preparration for another run. Remove the bomb from the bucket and open
26、 the knurled valve knob on the bomb head to release the residual gas pressure before attempting to remove the cap. Venting the bomb must be carried out either in the hood or out of doors. If no further use is to be made of the combustion products, wash the bomb thoroughly and allow to drain. If furt
27、her analyses are to be made, the bomb washing should be caught and retained for analysis. 4.5.12.5.5 Calculations Heat of Explosion, cal/g = WE XAT W Where WE = Water equivalent factor OT = Temperature rise W = Weight of sample When Booster propellant is required, the calculation is adjusted as foll
28、ows: (WE XDT - CWB X C)- = W Where WB = Weight of booster C = Caloric value of booster 4.5.12.5.6 Safety aspects. Do not exceed calculated maximum sample sizes or fill the bomb to greater than forty (40) atmospheres pressure. Otherwise excessive pressures may develop in the bomb. Exercise all safety
29、 precautions normally taken when handling solid propellant and gas cylinders. 16 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-70505 (4) 9999906 1637056 97T a MIL-P-70505 (AR) AMENDMENT 4 PAGE 17 6.4 Change “SMCAR-LCU-SI“ to SMCAR-FSA-IM“ . A
30、dd new Appendix A as follows: PAGE 18 APPENDIX A 10.1 Application of statistical process control. The contractor will for the identified dimensions maintain Xbar and R SPC charts. After the contractor has demonstrated that his process for manufacturing a particular feature is in control, as defined
31、in paragraph A.l.l; he will discontinue acceptance sampling inspection in favor of acceptance by SPC. However, SPC charting will be maintained for all identified dimensions whether or not the process is in control. It is expected that the contractor will make every effort to bring each process into
32、control. It is required that the contractor re-evaluate his established control limits on a monthly basis and make those changes warranted by the data. At no time should his process parameters vary such that it will fail to meet the requirements established in subsequent paragraphs. Should this happ
33、en, the contractor will return to acceptance by sampling. those dimensions identified in the classification of defects tables as being applicable for elimination of lot sampling acceptance, the contractor shall implement, on a dimension by dimension basis, acceptance by SPC after he conforms to each
34、 of the following steps: a. The contractor performs an indepth process capability study to establish the mean process average (Xdouble bar), Rbar, upper and lower control limits. This study will consist of at least 40 subgroups of data collection. b. The contractor demonstrates that his process is u
35、nder control for at least 20 consecutive production days. Control is defined as remaining within the established control parameters and not exhibiting any of the out of control conditions defined in paragraph A.1.2.a through A.1.2.e more than two times on an individual character basis. 10.1.1 Implem
36、entation of SPC for acceptance of product. For c. Thirty days consecutive production have passed acceptance sampling for the feature. 17 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-70505 (LI) W 9999906 Lb37057 Bob MIL-P-70505 (AR) AMENDMENT
37、 4 d. The process has a demonstrated Cpk equal to or greater than 1.3 and demonstrated when conducting the above test. Cpk is defined as follows: Cpk = process mean - nearest specification limit 3 sigma sigma = process standard deviation (calculated by the range e. The contractor documents his detai
38、led process description. method per the referenced ANSI documents) This process description must be submitted to commander, AMCCOM, ATTN: SMCAR-QAR-Q, Picatinny Arsenal, New Jersey 07806-5000 for review and disapproval if the description does not meet its objectives. That is the process description
39、will identify all known contributing variables and their respective controls that are necessary to maintain the specific dimension (i.e., weight, temperature, machine speed, time, tool life, solution proportion, etc.). The Government will furnish the contractor with written notice of the acceptabili
40、ty of his process controls. A notice of control acceptability is required prior to the implementation of acceptance by SPC. 10.1.2 Process control analysis. Once SPC acceptance is implemented, the contractor will evaluate his process for evidence of nonrandom variation (e.g. trends, extreme values,
41、etc.). Should any out of control condition be detected, the product produced from the last sample till the process is brought back into control will be isolated for analysis. The contractor will bring the process back into control or shut the process down. Upon determining the cause of the out of co
42、ntrol condition, the contractor will determine if the product manufactured and isolated could be out of engineering tolerance. If the out of control condition did not result in the production of nonconforming material, the material will be released. If the out of control condition could have created
43、 nonconforming product, the contractor will sample the product using MIL-STD-105 and the AQL specified in the classification of defects table to determine the acceptability of the isolated product. This evaluation of out of control product requires the review and approval of the local Government qua
44、lity assurance representative. As a minimum, the contractor will look for any of the following out of control indications: a. If any point goes outside the Xbar or R chart control limits. b. If 9 points in a row are either continually above or continually below the Xdouble bar. c. If 6 points in a r
45、ow are either continually increasing or continually decreasing on the Xbar chart. d. If 6 points in row are increasing on the range chart. e. If any individual sample, Xi, falls outside of the specification limits. 18 Provided by IHSNot for ResaleNo reproduction or networking permitted without licen
46、se from IHS-,-,-MIL-P-70505 (4) 9999906 Lb37058 742 MIL-P-70505 (AR) AMENDMENT 4 10.1.2.1 Process capabilitv review. At least once a month the contractor will review his process data and establish updated control limits. 10.1.3 Mandatory return to samplinq acceptance. Acceptance by SPC will be disco
47、ntinued in accordance with the following paragraphs. In any case, control charting will be continued. When this occurs, the contractor may reintroduce acceptance by SPC by repeating the steps outlined in paragraph A.l.l. 10.1.3.1 Out of control incidents. If for any individual process, an out of con
48、trol incident is identified 3 times within 5 consecutive shifts or 5 times within 30 consecutive shifts; and the analysis indicated that nonconforming product may have been manufactured, the contractor will return to acceptance by sampling for the pertinent feature. for more than 10 calendar days, t
49、he contractor will return to acceptance by sampling for that pertinent feature. it is determined that the Cpk is no longer at the required minimum of 1.3, the contractor will return to acceptance by sampling for the pertinent feature. 10.1.4 Records. The contractor will maintain all records dealing with SPC in his files for a minimum of 5 years after completion of the contract. control of the process, it is recommended that Government representatives select samples at
