The force on workpiece under the different processing parameters was measured in spindle barrel finishing. The rule of force and the process mechanism were investigated to provide references for theoretical analysis and practical process. By changing the mounting location of workpiece, the force was found to be a quadratic function of the distance between the workpiece and the center of drum or the free surface in the case of more than 60% of mounting location, while the rest was that of power function. Moreover, the mean force on workpiece in the direction of facing the abrasive flow is maximum, which is 4.5 to 8 times of other three directions. From the perspective of friction factor, the surface of workpiece in the direction of facing the abrasive flow is impacted and squeezed while the surface of the two parallel sides is stroked by the abrasive. Futhermore, surface texture of the square tube before and after processing were observed through three-dimensional electronically controlled ultra-depth microscope to demonstrate the above conclusion. The friction factor of the two sides in the wet condition is 0.034 and 0.18, respectively, which is much lower than that in the dry condition, 0.13 and 0.49. The friction factor is decreased substantially and the number of rolling abrasive is relatively increased, which is obvious especially in the inner side.
Key words
spindle;barrel finishing;dynamic force signals;force;process mechanism
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References
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