The Experimental Study Of Thetransverse Vibration Control Of Diamond Circular Saw-blade

The diamond circular saw blade is a typical ultra-thin part with a relative large radius-thickness ratio. As a main cutting tool in the production of granite slabs, it is generally applied in the sawing and processing of granite. For the purpose of saving stone resources and reducing the pollution of environment, it is developed to be thinner. However, in the process of sawing, it is seriously deformed and the vibration is intensified for insufficient lateral flexibility. Therefore, it causes a series of problems, e.g. stiffness reduction, easy deformation under the external force and strong vibration, which will induce the life of saw blades and produce poor-quality stone manufacture. In light of what is mentioned above, how to control the diamond circular saw blade's axial deformation and improve its sawing stability is becoming a quite significant subject for research and study.In this thesis, by means of the eddy current displacement sensors mounted at different positions, piezoelectric chip force measurement instrument and the test system based on Labview virtual instrument, the axial deformation and axial force are on-line monitored and the axial deflection and vibration are tested and analyzed at three positions, namely, the cut-in position, the middle position and the cut-out position on the saw. At the most obvious position of the axial deformation, an auxiliary support controller is used to restrain the saw blade's lateral displacement. The sawing force and the signals of axial displacement under the combination of different sawing parameters (e.g. sawing depth, feed velocity and peripheral speed) are collected, analyzed and tested. In this thesis, the saw blade's axial vibration and deflection are compared under the condition with or without a controller and the effect on the saw blade's axial deformation caused by an auxiliary support controller is preliminarily discussed. The main experiment results are summarized as follows:1,The auxiliary support controller designed for diamond circular saw-blade has a stable structure, and can adjust control force.2,The degree of the axial deformation varies at different positions of the saw-blade, among which the cut-in position is the strongest, the cut-out position second and the middle position last. The axial vibration at the cut-in position and the cut-out position is obviously strengthened while at the middle position is weakened after the saw-blade cuts into the workpiece.3,A proper controlling force can restrain the axial deformation, e.g. if the peripheral speed is 30m/s, the controlling force of 7N is almost suitable; if it is 40m/s, the controlling force of about 3.5N is available. Meanwhile, the controlling force should be relatively reduced when the sawing is deeper.4,The auxiliary support controller installed at the cut-in position can largely restrain the axial deflection with different cutting usage. Compared with the sawing without a controller, its axial deflection is only 17% as more as that and the axial force is only 37% as more as that. With the help of an auxiliary support controller, the sawing noise is reduced and the sawing stability and efficiency are improved.5,To some degree, the auxiliary support controller installed at the middle position on the saw can restrain the axial deflection, but the axial force is obviously aggravated. When the auxiliary support controller installed at the cut-out position, it cannot restrain the axial deformation, so the difference of axial deformation between the saw-blade with an auxiliary support controller and that without it is very small.