DETERMINATION OF CUTTING FORCES WHEN MILLING ELECTRICAL INSULATING BOARD


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Abstract

The article discusses the features of processing of power transformers isolating parts made of electrical insulating cold- and hot-pressed board. Specific feature of processing of this material, manufactured as a pressed softwood cellulose fiber in the form of plates of required thickness, is the dependence of cutting forces on the temperature conditions, and the texturing of layers in the plate. The authors describe the technology of processing parts of electrical insulating board the main forming method of which is milling. This process uses cylindrical, disc, face and end mills. When calculating the milling forces the article offers to use analytical dependence considering shear processes in the chip area, the friction forces on the front and rear surfaces of the tool, as well as additional components of friction force during forced cutting. To register temperature exposure and associated adhesive plasticization, as well as the increase of viscous forces, it is proposed to use the rheological model in the formula for determining of limit stresses. Experimental research of the influence of technological factors on cutting forces proved the appropriateness of application of suggested analytical dependence for low-speed range. The specific feature of processing in this range is the absence of milling force plastic component during chip removing. Experimental results showed the following differences in processing electrical insulating board and metal. When processing board, tooth mesh frequency of disturbances is practically non-existent within the spectrum of frequency of the cutter spindle drift signal. The article shows visually the results of analysis of the high frequency component of oscillations obtained during the wavelet analysis. Besides, during processing, the oscillations are not observed at natural frequency of tool intersystem even under the limit processing conditions. Due to the increasing dependence of cutting force on velocity, this fact shows that self-oscillations are not possible within studied speed range during processing this material.

About the authors

Dmitriy Alexandrovich Rastorguev

Togliatti state University, Togliatti

Author for correspondence.
Email: Rast_73@mail.ru

candidate of technical sciences, Associate Professor of the Department «Equipment and Technologies of Mechanical Engineering»

Russian Federation

Igor Vladimirovich Kuzmich

Togliatti state University, Togliatti

Email: jj79@list.ru

candidate of technical sciences, Associate Professor of the Department «Equipment and Technologies of Mechanical Engineering»

Russian Federation

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