The dissertation is devoted to solving of the relevant scientific and applied problem of improving the technological process of non-stop book-edge trimming. The solution is based on the development and using of a new method of three-way trimming of book edges with eccentric disk knives. It will ensure the effectiveness of post-print processing of books due to higher performance of automatic flow lines and higher quality of trimming. This will create prerequisites to prepare recommendations for the design of new cutting sections of flow lines.
The developed mathematical models allow to determine the geometric and kinematic cutting parameters, which enable pulse cutting, as well as to calculate the size and position of the characteristic sectors on the blade of the disk knife. For calculations and geometric simulation, utilities was written on MathCAD and AutoLISP. In the future, the experimental verification confirmed the correctness of the calculations.
The influence of the cutting process parameters (blade rotation direction and speed, knife diameter, block feed rate, blade sharpening angle, etc.) on the reduction of the actual cutting angle, the value of which affects the value of the cutting process forces, is determined.
The original test stand was designed and manufactured, which made it possible to carry out experimental studies of a stopless method of book-edge trimming and analyze the impact of technological parameters of cutting with an eccentric disk knife on the force and quality of the books processing. Experiments have fully confirmed the hypothesis of a possible occurrence of impulse processing mode in the expected range of selected cutting parameters. Practical possibility to use eccentric disk knives for non-stop book-edge trimming from three sides has been proven. It reduces the cutting force by about one half with high cut surface quality. The eccentric cutting features were revealed, and the positive effect of the intermittent cutting on the efficiency of the processing of book blocks was confirmed due to reducing of the actual cutting angle, the impulse effect of the knife blade on paper and the sparing conditions of the blade movement, compared to the traditional knife. As a result of comparative tests on wearing of blades of eccentric and traditional disk knives, it has been found that the change of wear of blades in the process of knives blunting are similar. A slightly less wear of an eccentric knife blade than the traditional one, is detected. It indicates the lighter work conditions of the eccentric knife blade compared to the traditional disk knife.
Keywords: non-stop cutting, eccentric disk knife, book-edge trimming, cutting speed, cutting angle, cut quality, process kinematics, block feed speed, knife rotation direction, flow line.
