1、/ - -. -_ MIL-B-45qA 34 m 7777706 0243372 7 m. F- I- M,-F-Ii S48(USAF ) 2 September 1952 I- PIILEARY SPECIFICATION BENJIEG NACHINES, PIPE AND COhyDUIT, AIRCRAFT, FDFPULIC TYPE, FLOOR MOUNTED 1. SCOPE 1.1 SCOPE.- This specification covers floor-mounted, hydrzulic- type, aircraft pipe srid ccnduit ben
2、ding mchines. 1.2 CLkS1CATIOIJ.- The bending machines shall be of the following sizes, as specif2ed (see 6.2): Size 9 - 1/2- to 3-inch tirbe capacity Size 6 - 3-i/2- to -141. FF-ELle6 CQ-B-671 Military 141L-C-087 IIIL-F-EO5 8 STA-ND A RI3 Military MILTD-i30 Motors j Alternzting-Current, Integral- Eo
3、rsepower Bearings; Roller Bronze, Aluminum; Cas tines Color Conditioning of Machinery and . Shop Zquipment, General Specification For Preparation Foy Delivery of Machine Tools For Domestic and Overseas Shipment Identification Harking of U. S. Militarg Property Provided by IHSNot for ResaleNo reprodu
4、ction or networking permitted without license from IHS-,-,-MIGB-4548A (USAF) (Copies of documents required by contractors in connection with specific procurement functions should be obta.ined from the procuring activity ar as directed by the contracting officer,) 2.2 OTHER PUBLICAT1NS.- The followin
5、g documents form a part of this specification. on date of invitation for bids shau. apply, Unless otherwise indicated, the issue in effect National Machine Tool Builders Association Machine Tool Electrical Standards (Copies of .MBA Electrical Standards may be obtained from the National Machine Tool
6、Ehildera Association, 2071 East 102nd Street, National Bumm of St9ndarda Cleveland 63 Ohio.) Handbook H28 Screw-Thread Standards for Federal Services (Application for copies should be addressed to the Superintendent of Documents, Govemnt Printing Office, Washington 25, D. C.) 3. muIRE”Tc 3.1 PREPROD
7、UCTION.- This specUication makes pmvisions for preproduction testing. 3.2 COMPOS.- he beding machine hau consist of the following components3 a. bo C. d, e. fo g. ho ib Base Bending arma Die mounting Mandml extractor Hydraulic system ElW triC81 equipment Spindle Accessories Controla Provided by IHSN
8、ot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-454A 34 m 7979906 02L)337L) O 3.3 MATERIAL.- The material shaU,be of uniform quality and in sound condition. ability to the best commercial quality used for this type of equipment. It shall confonn in composition
9、, heat treatment, and suit- 3.4 DESIGN AND CONSTRUCTION.- The bending machine shall be designed and constructed so that no parts Kill work loose in service. be built to withstand the strains, jars, vibrations, and other conditions incident to shipping, storage, installation, and service. It shall 3.
10、4.1 ADJUSTMENT AND REPAIRS.- The bending machine shall be constructed so that adjustments and repairs can be easily made by the personnel of operating units and overhaul basea without the use of special tools. 3.4.2 JELDNG, BRAZING, AND SOLDERINO.- Welding, brazing, and solderlng shall be performed
11、in accordance with the best commercial practice. in no event shall welding, brazing, soldering, peening, or plug-g be used on castings or forgings for reclaiming any parts of the machines without authorization of the procuring activity. 3.b.3 CASTNGS.- All castins shall be of uniform quality, free f
12、m blowholes, porosity, hard spots, shrinkage defects, cracks, or other injurious defects. ties of the castings shall be adequate for the purpose intended. Strength and other essential physical proper- 3.4.4 FASTENING DEVICES.- All screw, pins, bolts, and aimilar parts shall be inctlled in a manner t
13、o prevent loss of tightness and adjustment. shall not be swaged, peened, staked, or otherwise permanently defornad. mechan iczliy secured, soldered, or brazed. of soldering acids, acid fluxes, or soldering salts shall be avoided. When these are used, all joints or terminals shall be thoroughly clean
14、ed and all traces of acid or salts removed to avoid corrosive action. All such parts, when subject to remavai or adjustment, 3.4.5 ELECTRICAL u)NNECTIONS.- Electrical connections shall be Whenever practical, use 3.lr.6 CONTROLS.- All controls and operating levers shall be 3.4, SAFETY DEVICES.- Adequ
15、ate safety devices of the latest type located within easy reach of the operators normal working position. shall be furnished. operator shall be guarded. shock. When specified, special safety devices shall be prprlced in accordance with the requirements of the pmcuring activity (see 6.2). of the rota
16、ting arm next to the stationary ann. connected to the electrical system in a Itmner that will stop the rotating arm in the event personnel or objects in aluminum of 3-inch OD anci 0.49-inch wan thickness to a 3-l/Z=inch centerline mdius; and stainless steel of 3-inch 02 and 0.06S-inch wzll thickness
17、 to a 3-l/Z-inch centerline radiuo. 30)J*803 SEE 6 1JIACHEE.- The size 6 machine shall have adequate torque, noce section, spindle, bearings, die moUnt,ings, anc! rigidity to prov5de capacity for repetittve bending of 6-inch OD stainless-rteel (tse 321) tubing, with minimurr, m11 thickness of 0,035
18、inch and nixximum wall thichess of 0,125 kci, to a minimum centerline r2dius of i2 inches and a ma- centerline radixs of 24 inches. The machine shall be capable of making such bends withilt winklixgs flzittening, or otherwise distorting the tubing beyond existing abcraft imhstry standaxis, Tkis shal
19、l further include such critics1 bending as follows: Stainless-steel tubing of 3-inch OD and 0,016-inch wall thickness to a 64bch centerline radius; stainless-steel tubjng of 4-inch OD and 0,02$inch wall thickness to a stainless-steel tubing of 4-inch OD and 0.020-inch wall thickness to an 8-inch cen
20、terline radius; stainless- steel tubing of $inch OD an6 0,025-inch wall thickness to a 10-jnch centerline radius; and aluminum tubing of 5-1/2-inch O0 anrl Oo042-nch wall thickness to an Il-inch centerline mdius. 3.4.9 and the method of mounting the radius block shall be such that the radius block r
21、uns true with the as of the spindle. O.M$ inch. accurate to within 1/2 of 1 ACCUR9CY.- The construction of the nose, spindle, bearings, Run-out shall not exceed The angle-of-bend selector mechanism shll hold angles 3.5 PERFOR4ANCE.- The bending machine shall be capable of meeting the requirements sp
22、ecified herein, 3.6 DETAILS OF COMPONENTS 3.6.1 BCI.SE.- The base shall be constructed from hobrolled steel piate, arc-welded to foxn a rigid machine base and oil reservoir in one unit, problems. No special heat dissipation measures shall be required. The The oil capacity shall be suffic5enc to elim
23、inate any oil heat i. I = e Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-454A 3LI W 9777906 0243376 -1 oil reservoir shall have ample openins to pennit easy cleming periodically, Oil reservoir openings shall be fitted with gasket-sealed cove
24、rs to prevent entry of foreign matter, provided to the punip, oil lines, and fittiny which shall be conta5ned 5.n the oil reservoir to avoid an additional outcide tank to house these units. However, at the same time easy access shall be 3.5.2.1 SI22 3 MACHD!E.- The statimery and roatng bending arms
25、shall be Constructed of steel castings and steel plates of arc-welded cor!strxtl m. Construction shall provide ample ripidity to withstanc? repeat4 stresses Zreatec! when bending steel tabing of 3-inch OD by 0.065-inc5 wall thickness to the shortest possible radius. ?he arms shall be accw-ately mach
26、inec! to take the slide c.?stings that advance and retract the clamp and pressure dies, made of vanganese bronze, having 65,000 pounds tensile strength, or equal. !%e castings shall be protected by wear strips and antomatically 1uSricEted. the clz; a2 “yrPsr:.mz . ana pressure ie holders. am shill r
27、otate either counterclockiise or clockwise when viewed from the front of the machine. The slide castings shall be Tc prevent l?zg breakage, screws used to adjust pressure cf %e 3.6.2.2 SIZE 6 MACHING.- The stationary and rotating bending arms shall be constructed of steel castings and steel plates o
28、f arc-welded construction. Construction shall provide -le rigidity to withstand repeated stresses created when bending the sizes of tubing specified herein. ?he arms shall be machined to take the slides and shall be provider! with adjastable gibs. face? OR wear smfaces with replaceable bronze wear s
29、trips. . arms shall rotate either coiuiterclockwise or clockwise when viewed from above. The slides shall be of cast steel, The 3.6.3 DIE MOEJKTING, SIZES 3 AND 6 t-.4CtINES.- In order to provide for quick changing of bending tools, all dies shall be of the pickoff type, The pressure die shall be mo
30、unted so that it will move forward freely with the tubing during the bending function, and be fully retained and supported top, bottom, front, and back by needle bearings of suffi- cient size to withstand the extreme pressures exerted when bending to the capacity of the machine. maintain alignment w
31、ith the tabe. Vertical adjustment shall be srovided to 3.6.3.1 DIES.- Form and clam? dies for all tubing of from 1/2 throaph 6 inches in diameter shall be fabrj cated from steel and shall be heat-treated to a RockweU. C1 scale t=lue of not less than 30. Wiper dies for all sizes of tubing, 1/2 t irou
32、gh 6 inches in dsameter, shall be fabricated from bronze in accordance Lth QS-B-671, class 3. r: ? *- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.6.3.2 Y accessories and equipment shall be furnished with each machine: a. ls-hp motor, 1,200 rpm,
33、 220/4!tV, 3-phass, 60-cycie ac. b. Hydraulic mandrel extractor. C. Mandrel rod to accept a 12-foot long tribe over the IllBndEll. d. Stop assembly, distance between bends, with not less than 4 stop positions. e. Plane-of-bend selector with means to gage distance between beds. f. Calibrated scale to
34、 aid in setting angle-of-Send turret stops. 8. Automatic lubricator or one-shot hbrication system Safety device to automatically stop machine if to carry the lubricant to ali moving parts requiring lubrication. personnel or objects inadvertently corne between the statbnary or swinging am. h. Provide
35、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-4548A 34 W 7777706 0243380 b MIL-34548A (USE.F ) i, Handbooks in compliance with data requirements covering operation, mauitenance, and ins tmctiom for fbbricatjq? dies, shoes, rails, and mandreh as mqui
36、red for various bends, 3. Die blocks, slide blocks, chq blocks, mandrels, and hydraulic mdrel extmctors shall be provided for the following sizes of tabbg: OD Incies Wall Thickness Inches - L - - 3.6.9 CONT3OIS.- The bending mzchines shaU. be pushbutton con- trolled, The pushbuttom shall be mounted
37、on a portable stand so that the openitor may place his controls where they are most convenLent, The bending cycle shall be started, manipuizted, and stopped by momentary cofitgct of the control button. Pressing the return button shall return the ben6ng am to the start position an0 automaticaUy advan
38、ce the mandrel, making the machine ready for mother cycle. A stop button shall be provided to stop the niachine at any- point of the bend- cycle. An automatic-cycle switch shall be provided which, when closed, shall cause the machine to perform the complete bend and return this mandrel advance cycle
39、 by using the start button only, stond shall have buttons, appro-,riately marked, to pennit individua2 control of dies and mandrel as follows: In addition, the centml a. Advance clamp and pressure dies without moving the rotating am. b. Move rotating ann, stop at sny desired degree of bend, extract
40、the mandrel, open the clamp and pressure dies without moving the rotating ann, close the canp nd pressure dies again without moving the rotating am, end again roixte ann to another degree of bend, C. Advance mandrel before tubhg is clamped, d. Advance mandrel after tub-*, is clamped. 3.6.10 BEP.RNGS
41、.- The spindle shall be mounted on tapered rolier bearings. e1jxlnat-e shaft end play. Means shell be provided for adjustment of the bearings to Bearings shall conform to FF-B-186. 3.6.1,l MACHINE NOSE.- A box-type, casteteel nose shall be precision bored to fit the tkpered spindle bearing and shall
42、 be arc- wehied to the machine base to fonn a single unit. 9 c Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-454A 34 7797906 O243383 8 U Iiln-B-l548A (USAF) 3.6,l.l STOP ATUD GAGES.- An eight-position angle-of-bend selector si7211 be provided
43、 with the beding machines. The turret holding the angle-of-bend stops shall be so designed that turrets my be changed by sliding them on and off a bar. The machines sholl provid-e suffi- cient stops for iilakine a minimum of nine bends, interposed by eight straight sections of tubing. A plane-of-ben
44、d selector skiill he Fro- vieci anci shall operate in such E manner thet wherc the tubing, ckiiizkcd in a collet provided for the purpose, is rotated, a pointer shall show the degrees of rotxtjon on a dialo 3,h.12 LIiRICATOii. An automatic Bijur lubricator, or equs, shall be provided to automaticall
45、y lubricate the slide castings tht actuate the climp and pressure dies, TOOIS,- A set of tools, complete and adequate in all 3.h03 respects to make the bends specified in 4.3.1.2.1 and 4.301.02.2, sk.all be firnished xith and mounted on each machinee 3 ,? lT3RCiU-flGEEEILTrYa- A11 parts having the s
46、ame manufcturers pzrt number shall be directly an$ completely interchsngeable with each other vith respect to irist2ll:rtion and performanceo 3.8 THSFSE.= fi11 thmnded parts cf the completcd ascembb, mch as bolts, nuts, screw, end st-xds, shsU hsve Ancriccul Standad screw threads in accordance with
47、Handbook H2e. Tn addition, the threads of all EictuatinF: screws, feed screws, ancl other breaded s-afts and rods contributing either directly or indirec+,ly to control and Oper- stion of the mchinea shall be in zccordsnce with Haridhook H28. 3.9 3.10 3J 1 PP.D!TINGo- The bending machins shall be pa
48、inted in accordance with ICtL-G-1iO87 p31*tC shall be marked for ientificntion in accordance with P.%ASI!R,- WorlmansbiF shal. be the hi 180 142 6 40 O . 016 135 3 242 30 4.2.1 PREPRODUCTION TSST SAMPLE.- One bending machine9 as specified in the contract, shall be tested for design approval (see 6.2
49、.1). OD ( Inch) 3-1/2 542 4 6 and the fact tht the Government my have fomiitsd, furniched, or in any way supplied the saiX drawings, specFfications, or other data, is not to be reEarcled by implication or otherwise as in any manner licensing the holder or any other person or corporation, or convoying any rights or permission to manufacture, use, or sell any inventior. that may in any way be related
