TPT July 2016

AR T I C L E

Dalian Field

number of the saws, including increasing the number of multi- blade saws, and not only increasing the number of blades. Compared to speeding up the milling saw itself, the double- cart saw has enough time to make the cut, lifetime of the blades is longer, and the cut-off quality is better. Calculations and production practice show that at the same line speed the time for making the cut of the double-cart saw is two to four times longer than that of a single-cart saw. Or, in other words, with the same work intensity of the saw, you can raise the line speed two to four times. Also, the double-cart saw has got more time for cutting those not easy to cut thick-wall tubes, and this is very important for heavy mills and mills for special material products. In the near future, due to the use of the dual-cart milling saw cut-off, high-productivity tube mills will get a great advantage in the market and will become the main trend in tube production until a new concept of cut-off is born. Tube producers will gradually realise that as the line speed is an important issue when choosing tube mill equipment, the basic point is the speed of producing your main product, and not the “nominal” speed of the line quoted by the mill equipment producer. “Nominal” speed is the highest speed performance of the mill, but the speed of producing your main product and your mill real production capacity might be much below your expectations, which may negatively influence your market competitiveness.

Four-blade milling saw

floor space, land, water, electricity and so on compared to an ordinary line. This is a great advantage and profit, and not only a question of raising the speed to 150 or 200m/min. We have already stated that the real and only irreparable bottleneck of the speed limit is the cut-off. All ways and means were used to solve this problem, such as double- and triple- blade milling saws, and even saws with four milling blades. But given the limited time for making the cut, these applications also turned out to be very limited. To raise the productivity of the milling saw, we have to increase the cutting time. To increase the cutting time, the only way is to increase the

Double-cart milling saw

Dalian Field – China Tel: +86 411 83192715 Fax: +86 411 83192716 Email: fd@fdmachinery.com Website: www.fdmachinery.com

Tube mill using the double-cart milling saw

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J ULY 2016