CALCULATION AND SIMULATION OF SLIDING FRICTION WITH ROLLING OBJECT APPLIED IN THE DESIGN OF THE WORKPIECE FEED-EXIT SYSTEM OF THE NEW SEMI-AUTOMATIC SILK SCREEN PRINTER

Abstract

The paper presents the calculation of the required inclination angle of an inclined plane to meet the rolling time requirements (with slip and no-slip) of a cylindrical object and its application in the design of the workpiece feed-escape parts of new semi-automatic silk screen printing machine. The formulas found are only true assuming the rolling bodies are homogeneous and cylindrical. As for the roller with complex shapes with many different material components (bottle cap, bottle body), Recurdyn software was used to numerically investigate the necessary angle of inclination. The simulation results show that the error between the formula in the ideal case and the simulation software is around 10%, thus it is possible to design the feed - escape module of the screen printing machine in the actual event. Specifically, the inclined chute for the workpiece feeding has an angle about 0.14 ÷ 2.3° of inclination, and the workpiece draining needs to have an angle of 7 ÷ 10° to ensure printing productivity requirements. The paper is a typical example of the application of simulation to the design of mechanical systems and machines in Vietnam.