EXPERIMENTAL RESEARCH OF VERTICAL FEED DRIVE LOADS IN SAW FRAME OF STRIP SAWING MACHINE

Stone milling production is analyzed from the viewpoint of stone block saw cutting into slabs. One of the most widely used equipment to this effect is strip sawing machines. Systems of such machines with pendulum and convex sawing paths often fail. One of such systems is the vertical feed drive containing such low-reliable elements as: lead screws, screw nuts, tooth gears, bearings, etc. Failures are caused by high loads on these elements. The experimental research reveals the nature and values of loads in the drive of the vertical feed of the machine. The article presents the diagram of the experimental laser beam machine capable of filming lasergrams of the torque history on the long gear shaft. The resultant curves in the lasergrams have two characteristic branches. The first branch illustrates the process of the shaft twist, which agrees with the linear increase in the torque. The second branch shows the process when saws contact stone blocks and is represented by the drop in torque down to zero. The behavior of the curves is reflective of the low rigidity of the gear shafts. During the tests, in the lasergrams, the rigid shaft mode is revealed in the operation of the vertical feed drive of the strip sawing machine. Such mode is characterized by continuous popping-off in the crew nut. Another lasergram shows an unstable operation mode of the vertical feed drive of the saw frame in case of the minimal force applied by saws on block stone. Determination of the nature and values of torques in the vertical feed drive of the saw frame is the basis for the analysis of of transfer members in the drive and design factors of the strip sawing machine.

Keywords

Strip sawing machine, saw frame, convex sawing path, lead screw, screw nut, vertical fed drive, transfer members, experimental testing machine, lasergrams.

Issue number: 1
Year: 2019
ISBN: 0236-1493
UDK: 622.022
DOI: 10.25018/0236-1493-2019-01-0-154-161
Authors: Sekretov M. V., Gubanov S. G.

About authors: Sekretov M.V., Candidate of Technical Sciences, Assistant Professor, e-mail: msekr@yandex.ru, Gubanov S.G., Senior Lecturer, National University of Science and Technology «MISiS», 119049, Moscow, Russia.

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