armox-machining-bending.pdf

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Workshop recommendations for ARMOX ARMOX plate (cont.) SSAB OxelÎsund AB SE-613 80 OXELÚSUND, Sweden Phone +46 155 25 40 00 Fax +46 155 25 40 73 www.oxelosund.ssab.se E-55-99 HELIN INFORMATION 9909 Countersinking & counterboring Countersinking and counterboring are best performed using tools with replaceable inserts. Cooling water is also required. Always use a revolving pilot. When countersinking reduce the cutting speed and feed by 30%. Bending armox armour plate can be bent both by V-die bending and by roller bending. armox plates should be bent at room temperature to avoid reduction of mechanical and ballistic properties. Other factors that may a¡ect the bending results are as follow: ^ Top tool radius (R). ^ Die opening (W). ^ Die edge radius and its hardness. ^ Bending force. Lubricated die edges lower the bending forces. The easier the plate slides on the die edge, the better the concentration of bending force. Between 10 and 25% lower bending forces have been achieved by lubrication. The table below shows the relationship between bending radius (R), die opening (W) and plate thickness (t). R W Cutting speed m/min feed, mm /r D, mm 19 24 34 42 57 ARMOX 300T ARMOX 370S ARMOX 500S ARMOX 600S 40^65 25^60 17^50 35^ 45 0.10 ^ 0.20 0.10 ^ 0.20 0.10 ^ 0.20 0.10 ^ 0.20 670^1090 420^1005 285^840 585^755 530^865 330 ^ 795 225^665 465^595 375^ 610 235^560 160 ^ 470 325^ 420 300^495 190 ^ 455 130^380 265^340 225^365 140 ^ 335 95^280 195^250 Thickness ARMOX 300T ARMOX 370S ARMOX 440T ARMOX 500S ARMOX 560S ARMOX 600S R/t W/t R/t W/t R/t W/t Springback 3 16 4 18 5 20 8 ^ 12³ 4 18 5 20 6 20 9 ^ 13³ 5 18 6 20 7 20 10 ^ 15³ 6 18 7 20 8 20 12 ^ 20³ 7 20 8 20 ^ ^ 14^25³ Contact SSAB OxelÎsund Counterbore with replaceable inserts and revolving pilot. Conical countersink with replaceable inserts and revolving pilot. Speed, rpm t H 8 mm t = 8 ^15 mm t I 15 mm t

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