Investigation on sawing performance of diamond frame saw based on reciprocating swing in processing hard stone

Abstract

An innovative motion mode of reciprocating swing was introduced in frame saw for cutting hard stones in this research. Further, the theoretical models for the prediction of sawing depth and sawing interval of single segment were established, respectively. Sawing experiments and sawing forces test were conducted on the frame saw prototype with the new motion mode to investigate the cutting performance in sawing two types of hard stones. The results demonstrated that the application of the innovative sawing mode resulted in effective shortening of the length of sawing arc, reduced the number of segments involved in sawing simultaneously, avoided the instability of sawblade, and ensured that the sawn slabs met the requirements of qualified products. The segments on sawblade surface were divided into “front end”, “middle end”, and “rear end” according to the difference in contact pattern between the segment and the block. Segments in the middle of sawblade usually participated in sawing at the same position with unequal forces in forward and backward strokes, and the distribution of the sawing forces depended on the position of segment on sawblade surface. However, segments welded in the front end and rear end of the sawblade made an instantaneous cut once at one of the reversing points with higher sawing forces during reciprocating strokes. The sawing force value was found to be positively correlated with the feed rate, negatively correlated with the spindle speed, and also correlated with the stone characteristics. This new sawing mode provides a new approach for frame sawing machine to improve the sawing performance in sawing hard stones.