1、MIL-S-20706A 21 April 1970 SUPERSEJXND 30 December 1957 MIL-s-20706 MILITAARY SPECIFICATION This specification is mandatory for use by all Depart- ments and Agencies of the Department of Defense. 1. scorn 1.1 Scope. This specification covers back-rip scarifier assem- blies for mounting on angledozer
2、s and bulldozers conforming to MIL-A-17076 and MIL-B-52449 respectively. 1.2 Classification. Scarifier assemblies shall be of the following types and sizes as specified: Type I - For straight-blade and semi- blade dozers covered in MIL-A-17076 and bulldozers covered in MIL-B-52449. Size 1 - For MIL-
3、A-17076, size 1 dozer Size 2 - For MIL-A-O?, size 2 dozer and MIL-B-52449, size 1 Size3 - For MIL-A-17076, size 3 dozer and KtL-B-52449, size 2 Size 4 - For MIL-A-17076, size 4 dozer and MIL-B-52449, size 3 Size 5 - For 1-17076, size 5 dozer Size 6 - For MIL-A-17076, size 6 dozer Size 1 - For size 1
4、 diozer Size 2 - For size 2 diozer Size 3 - For size 3 dozer Size 4 - For size 4 dozer Size 5 - For size 5 dozer Size 6 - For size 6 with Appropriate Test Methods. Eis39000 39126 - Shank, Scarifier, Back-Rip, Angledozer. - Shank, Scarifier, Back-Rip, Bulldozer. (Copies of specifications and standard
5、s required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. wise indicated, the i
6、ssue in effect on date of invitation for bids or request for proposal shall apply. Unless other- IFRM CLASSIFICATION COJMITEJ, Am I Uniform Freight Claeaification. (Application for copies should be addressed to the Tariff Publishing Office, Room 202, Union Station, 516 West Jackson Boulevard, Chicag
7、o, Illinois 60606.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL - s -20706A AMERIcAm WELDING SOCIETY Standard Qualification Procedure (AWS B3.0) (Application for copies should be addressed to the American Welding Society, 345 East 47th Stre
8、et, New York, N, Y. 10017.) AMERICAN SOCIETY OF MECHANICAL ENGINEERS Boiler and Pressure Vessel Code, Welding Qualifications, Section IX. (Application for copies should be addressed to the American Society of Mechanical Engineers, 345 East 47th Street, New York, N. Y. 10017.) NATIONAL MOTOR FEIGRl!
9、TRAFFIC ASSOCIATION, IHC., AGEPJ! National Motor Freight Classification. (Application for copies should be addressed to the American Trucking Associations, Inc., ATTN: Tariff Order Section, 1616 P Street NW, Waehington, D. C. 20036.) 3.1 Description. The back-rip scarifier assemblies shall each con-
10、 sist of one housing, one shank, and one tooth. for mounting on the back side of moldboards of straight-blade and semi- U diozers or “C“ frames of angledozers 80 that ripping or scarifier action is accomplished when the tractor-dozer unit is backing up with the blade dragging on the ground. scarifie
11、r housings shall bolt onto brackets mounted on the back side of the aroldboard. The tooth shank shall be hinged so that it can float freely over the ground when the tractor is blading forward. The shank shall be retractable into the housing, and a locking device shall be furnished to hold the shank
12、assembly rigidly above the lower edge of the blade. shall permit a ripping depitb below the blade not less than that speci- fied in table I for the size specified. The assembly shall be On straight-blade and semi-U ozers, When in the ripping positiofi, the scarifier assembly 3 Provided by IHSNot for
13、 ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-2070bA 38 = 9777706 Oq52q22 O M . size (Cretmd penetration, shank minimum (Inchei) (inches) 1 2 3 ic 5 6 Table II. Draft Load Requireinsnts 6 7 8 8 0 8 142 x 3 1-1/2 x 3 142 x k 2x4 3x4 3x4 I I 1 I 0,025 25,000 0.025 0
14、.023 70,OOO I 41,000 en MA 55,000 a : 2 lI i nent ret (Inch) ,oi?g- 0.025 0.25 o .o25 0.025 0.025 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-5- mm 3.2 First article. 3.2.1 Preproduction model. The rupplier ehall furnish a rcarifler assealj
15、 vithin the time fremi specified to prove, prior to . Portions of the scarifier assdly anti its components and parts aormally painted shall be cleaned, treated and minted in accordrrrrce with wTl;i-T-ldc, typs A. 3.7 Identification of high streMh steelr. when Sigh atrengtlr steels are wed in the fab
16、rication of the scarifier aasemblies, the supplier rhall include in the technical liestions the identification and lacation of these mtsslr, an the neceorary precautions to be taken by the using fbout disfortion or failure, Tb entire shank shall be 2Scakd maraard of any moldboard eurfacee. The horiz
17、ontal distance fror the cutting ege of the tcp of the shank ahaU accept and retain under ruimum of material shall be done by methode that wiU not cause aaags to the metal. Shearing and chipping ehall be done neatly and accurately. Corners shall be square and true, and all sharp edges and burrs shall
18、 be removed. Bmed sur- faces of flametat materia ihall be free of burrs, sharp eges, and slag. Precautions shall be *ken to avoid overheating, and heated petas should be allowed to cm1 ilowly except where heat treatmen% 3.6 required. All bends of a iiajor character shall be rade with metal dies or f
19、ixturee fo insure uniformity of size and sham. f?roa SLuld, dirt, fh89 Pits, 8prue1, scale, flux, and 0th- hsrnful, 3.U.l Fabrication. U parts shall be fabricated in such a manner 3.ll.3 Bolted connections. Bolt holes ahall be accurately punched or drilled and shall have the burr8 removed. Bolt hole
20、s in structural members subdect to pariable losds rhall be punched or drilled. Waders or Lociswashers shall be provided where necessary. All bolts, nuts, and serem shall be tght. Threads secarhg bolts or capscrews shall be of rufficient strength to wthetand %he tensile rtrength of the bolt. 3.11.4 W
21、elders and welding. 3.ii.ic.i welders. miore ass-ng say welder to manual miding wrk covered by this speciication, tho supplier shall provide the contracting officer with certlfication that the welder ha8 pasaed qusli- ilcation teats aB pre8crlbed by either ai the following listed codes for the %ypc
22、of welding opereton ta be gerformd an8 that auch qualifi- cation is effective as efned by the particular code: Standard Qalification Procedure of the American Weld* Society. WeliUng QixaUflcatn of the AS%3 Boiler and Pressure Vessel CoJrpe yoke to which it Will rount. 10 Provided by IHSNot for Resal
23、eNo reproduction or networking permitted without license from IHS-,-,-i MIL -S-20706A 4.5.2.2 Draft load. The scarifier housing shall be installed on the test stand, all nuunting bolts and nuts shall be tightened, and the shank shall be mounted in the housing in accordance with figure 2 and table II
24、. A jack shall be installed with the center of the jack in line with the lower end of the shank bar as shown on figure 2. A deflection gage shall. be mounted on the frame of the test stand, and the stem shall contact the shank at the point shown in figure 2. The initial load shown in table II shall
25、be applied for mt less than 2 minutes for the size being tested for seating all parts. Pressure shall be released and gages reset at zero before the terminal load is applied. utes. set specified in table II shall constitute failure of this teat. The terminal load shall be applied for not less than 1
26、0 min- I)anrage to or pemnent deformation beyond the maximum allowable 4.5.2.3 Lateral load test. The scarifier housing shall be Installed on the test stand, all munting bolts and nuts ehall be tightened, and the shsnk shall be mounted in the housing In accordance with figure 3 and table III. to per
27、mit the arm to pivot through a small arc which occurs in flexing the shank. An indicator gage for registering housing deflection shall be mounted on the frame as shown in figure 3. The initial load shown in table III shall be applied for not lese than 2 aiinutes for the eize bew tested for seating a
28、J.1 parts. gage8 shall be reset at zero before the terminal load ia applie. The terminal load apecified in table III for the aize being tested shall be applied for not less than 10 minutes. dcfomsation beyond the aaxmm allowable set specified in table III shall constitute failure of this test. The b
29、ase of the jack shall rest against a narrow bar Pressure shall be released, and Bmage to or permanent 4.5.2.4 Latch mechanism. When the spring latch mechanism is speci- fied, the type I housing shall be tilted at an angle of 50 degrees fror vertical with the spring actm$ed latch mechanism in place t
30、o prevent the shank fom hanging vertically due to the force of gravity. The shank shall be pulled to vertical position by hand and released. Failure of the mechanism to return the shank to its working position In the housing with the edge of the shank coatacting the housing base shal constitute fail
31、ure of this test. 4.6 Inspection of preparation for delivery. 4.6.1. Quality conformance inspection of pack. 4.6.1.1 Unit of product. For the purpose of inspection, a completely ploccared pack prepred for shipment shall be considered a unit of product. 11 Provided by IHSNot for ResaleNo reproduction
32、 or networking permitted without license from IHS-,-,-c MIL-S-2070bA 38 777770b Oq52430 T =I MlL-S-20706A a 4.6.1.2 Sampling. Sampling for examination shall be in accord- ance with MIL-SPD-lO5. 4.6.1.3 Examination. Samples selected in accordance with 4.6.1.2 shall be examined for the following defec
33、ts. AQL shall be 2.5 per- cent dei ect ive. 110. Materials and containere not as specified for level A or B. Ebch incorrect -%erial or each incorrect con- tainer shall constitute a defect. 111. Unpainted surfaces not coated with preservative as specified for level A. ll2. Strapping not einc coated f
34、or level A. 113. Strapping not placed ajacent to the skids for level A or B. 114. Marking illegible, incomplete or incorrect. 5. PRWUTIOBI FOR mLIVERY 5.1 Preservation. 5.1.1 Level A. Unpainted surfaces of the scarifier assemblies, includimnd nute, requiring the application of 8 contact preservative
35、 in accordance with MIL-P-116 shall be cleaned, dried, and coated with type P-1 preservative conforming to the applicable specification listed in MIL-P-ll6. Preservation shall be level A or C, as apeclfied. 5.1.2 Level C, The scarifier assemblies, including bolts and nuta shall be preserved to affor
36、d protection against deterioration from the supplier to the initial destination for inneedlate use. 5.2 PackInRe Paaking aha be level A, B, or C, 68 specified, 5.2,l Level A. The scarifier assemblies of like type and size ehall be packed in quantities of ttn, in close-fitting plywm boxes conforming
37、to PPP-B-601, style A or B, overseas type. The boxes shall be rodifled with skide in accordance with the box specification. Blocking and bracing of the assemblies within the boxes shall be in accordance with*MIL-SJ!D-ll%. be wived if necessary to accomplioh the packing specified herein. boxea shall
38、be etrapped ia accordance with the appendix .t;O the box specifications, except flat steel strapping shall be type I, class B and shall be placed adjacent to the akldi. The filler cage cleats shall be wide enough 80 an not to llow atrapping to pass over any vtlls. The weight limitation of the boxes
39、shall The Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CUSt4dian t 5.2.2 L6velB. The scarifier aseemblies shall be packed a8 speci- fied for shall not be required to be zinc coated. except boxes shall be domestic type and strapping 5.2.3 Level C.
40、Ehe scarifier assemblies shall be prepared for shipment in a manner to afford protection against deterioration at the lovest ratings of the carrier in compliance with Uniform Freight Clamification rules or Ilational &tor %rei&% Classification rules. 5.3 MarkW. Wking shall be in accordance with MIL-m
41、D-129. 6. B“E8 6.1 Intended use. The scarifiers are istended for use in ripping the ground by bullbozing-type vehicles during the time the vehicle is traveling in reverse or backing. The scarifiers can be used in all types of terrain encountered in mad construction and aimilar earth- iroving work. 6
42、.2 Ordering data. Procurement diocumnte shotild specify the following : (a) Title, number, and date of this specification. (b Type and size required (see 1.2). (c lhe irame required for submission of the preproduction (U) Applicable list of repair parts and maintenance tools (see 3.8). (e) When a ap
43、ing actuating 11ccknnfem is required (roe 3.9.3) (f) Lave1 of preservation and Isvcl of packing required (see 5.1 and 5.2). mdd (8- 3.201). ! 6.3 Preproduction podel. Any changes or deviations of production scarifier aseenbles from the approved preproduction godel during pro- duction will be subject
44、 to the approval of the contracting officer. Approval of th preproductian podel Kill not relieve the rupplier of his obligation te ft1mi8la rcarifier assemblies conforming to this 8mcif ication 0 prepariag activity: Vier aatlritier : Project Ila. 3830-0079 Provided by IHSNot for ResaleNo reproductio
45、n or networking permitted without license from IHS-,-,-MIL-S-2070bA 38 = 97799Ob 0452432 3 W f Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-r Y r- I li I El- T i Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-2070bA 38 W 777790b 0452434 7 W m t 1- c cn F rh U. S. GOVERNMENT PRINTING OFFICG 1970-393-097/5.8545 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
