TPT May 2007

› Figure 7 : A fish eye view of an Attl mill for tubes to 104x4mm

Conclusions This analysis clearly shows that in order to make the current and new production mills the most effective, it is advantageous to install a dividing machine able to switch between the flying saw method and flying shear cutoff method, which is a combination machine. The concept and its advantages become apparent in production lines for tubes Ø 38-102mm and other derived square/rectangular profiles. The use of a combination dividing machine, providing there is a sufficient reserve capacity of HF welding generator, can increase mill production by 25-30 per cent and return investment within a year. As already mentioned, the production program of Attl a spol sro includes entire tube mills. However, it is worth pointing out the quality of Attl a spol’s CNC bundling machine for the full range of tubes and profiles in lengths from 4-12m, installable as the final module of a production mill. Attl a spol sro have designed and installed a new type of vertical strip accumulator in three production facilities. This is a good alternative to the expensive and energy thirsty horizontal accumulator.

Flying cold saw Alda s 200 x 6 – 40 Kvatro

Parameters

Values 200/138

Units

Tube diameter max/min Square profile max Rectangle profile max Wall thickness max/min

mm mm mm mm

150 x 150 200 x 100

6 ÷ 1.2

Material

S 185; S 235 JRH; S 235 JR; 1.4301; 1.4571

Mill speed max

50

m/min

Rotary saw diameter

4 x 250

mm

Number of cutting cycles for L= 6m

8

1/min

Life of rotary blade between sharpening (est)

80 ÷ 100

t

Power input

180

kW

Comments: The concept of four saw arbors means, that during 65 per cent of the time it takes to make a cut, four rotary saw blades are working together and there are eight contact places. This is the reason why, for example a s/s tube Ø 200 x 2mm takes only 4.8 seconds to cut, which is about 1/10 of the time needed to make the same cut using a belt saw. Aldas Kvatro was used successfully also with s/s tubes.

Attl a spol sro – Czech Republic Fax : +420 271 960 414 Email : attl@attl.cz • Website : www.attl.cz

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M ay /J une 2007