1566 Weldon 19 mm 3/4" 50 mm | 2" Weldon Weldon Weldon 19 mm 3/4" 25 mm | 1" CONTACT INFORMATION For more information please call +44 1530 261 145 or send an email to sales@atagarryson.com RECOMMENDATION DRILLING HARDOX 400/450/500 PLATES WITH HARDOX-LINE ANNULAR CUTTER ART. 20 1680 / 20 1690 1. Requirement of speed The best line speed for HARDOX annular cutters is Vc between 30 up to 35 m/min Explanation: Wrong speed is the most common mistake operators make especially in combination with HARDOX steel. HARDOX steel 400-500 is very hard. Most operator thinks the harder the steel the lower the speed should be. This is particularly wrong with HARDOX steel. When using too lower speed such as Vc 10 m/min cutting holes is almost not possible. 2. Recommended feed Diameter Vf (mm/min) fz (mm/r) 14~18 21~27 0.03~0.06 19~25 24~30 0.04~0.07 26~30 21~27 0.05~0.07 31~36 18~24 0.05~0.08 Application example: HARDOX annular cutter diameter 18 mm cutting in HARDOX plate 12 mm with Vf = 24 mm/min. Hole has to be done in approx. 30 seconds. Explanation: Feed is the key point, because hardness of HARDOX steel is tough and also with high manganese content. If cutting with low feed, the cutting edges will slip in place and will wear out quickly. 3. Requirement of cooling 3.1. When cutting Hardox steel plate ≤ 12 mm thickness, operator can choose dry cutting. Using oily coolant (vegetable oil) for cooling will have better effect. 3.2. When cutting Hardox steel plate ≥ 12mm thickness, operator must choose oily coolant (vegetable oil) for cooling. 3.3. Aqueous coolant is not recommended because the temperature of the Hardox cutter is very high during cutting. The removed chips are red (visible at night). Using aqueous coolant may cause cracked teeth and shorten the tool life of the cutter. 11 Index 10 9 OIL 8 7 6 5 4 3 2 1
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