Combined double crank-slider mechanism (reforming the synthesis method)

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Behen P. I., Koval T. V., Kuznetsov V. O., Rehei I. I. № 1 (77) 20-29 Image Image

The article focuses on the widespread use of corrugated cardboard packaging, due to its universal functions. It is noted that specialized die-cutting equipment is used for the production of large-scale cardboard involutes, and the use of it is limited in working format. The implementation of a new technological process and a means of making corrugated cardboard involutes based on the use of mobile disk tools and fixed counterblades has been substantiated.

The use of the crank-sliding mechanism in the construction of the tool for cutting slots in the corrugated cardboard involutes is accompanied by inertial forces on the drive. The process occurs in the unstable conditions of the interaction of disk tools with the material. This negatively affects the quality of its tooling. To minimize negative phenomena, it is necessary to provide conditions for relatively stable functioning of the tool for cutting slots in the corrugated cardboard involutes.

For the synthesis of a combined double crank mechanism with a programmable change in the length of the connecting rod special software has been used. It has been created in the AutoCAD program using the AutoLisp language. Its capabilities have been enhanced by the use of the Dialog Control Language system, which provides the creation and active use of dialog windows. The construction of the slide drive with disk tools, consisting of a combined double crank slider mechanism with a variable length of the connecting rod has been improved. For length regulation of the connecting rod the rational application of the law of the periodic motion “cosinusoid” has been confirmed. The results of the research show that its application for programmable changing the length of the connecting rod allows an increase of the angle of rotation of the drive crank, during which the value of invariant of angular velocity of the slave crank is less than one.

According to the results of the research of relative kinematic parameters of the doub­le crank slider mechanism with a programmable change in the length of the connecting rod, a rational geometric construction of the original combined mechanism has been obtained. Computer profiling of the cam slot in the selected research positions has defined that the value of the angle of pressure in the “roller-cam” pair and the curvature radius equidistant to the cam slot corresponds to the conditions for the stable functioning of the tool of manufacturing large-format corrugated cardboard involutes. The obtained values of invariants of the kinematic parameters of the slider with disk tools enable further analytical and experimental research of the manufacturing corrugated cardboard involutes with a scissor cutting.

Keywords: packaging, corrugated cardboard, involute, slider, disk tool, combined double crank mechanism, invariant, kinematic parameters.

doi: 10.32403/0554-4866-2019-1-77-20-29


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