Untersuchungen an einer horizontalen Blockbandsäge

Summary

The above investigations have been carried out with the aim to enlarge the scientific knowledge of log band sawing, to increase the capacity of such machines and to extend their field of application. In the beginning basic knowledge concerning the cutling process with log band saws and a description of the conditions of band tension and theoretical relations are discussed.

All investigations have been carried out on a horizontal log band saw with a log passage of 1000 mm. An evaluation of the various tests had the following results: According to tension tests the upper limit for the tension-force has been computed at approximately 400 kg or 2000 kg for each part of the saw blade.

Factors influencing the cutting process, such as cutting and feeding speed, distance of teeth and cutting height, have been investigated and the importance of well selected operating values has been underlined. With different distances of teeth and different cutting speeds capacity and cutting force seemed to increase progressively with the feeding speed. With constant feeding spend the cutting force per tooth increases with distance of teeth and presents a minimum between 25 and 30 m/s. The specific cutting force, on the other hand, shows a minimum at 0,2 mm feed per tooth and is less dependent on the cutting speed. The cutting force increases somewhat more than proportional to the cutting height, while there is no such steep rise with low feeding speeds. Near the highest possible feeding speed and with higher main cutting forces the cutting area shows increased waviness, which might be due to rising feeding forces.