Justification of the method of book block spine processing by a cylindrical tool with a screw cutting edge

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Knysh O. B. № 1 (62) 95-104 Image Image

The article states that the perfect binding of book blocks is the most common method among others. This is due to the block binding during transportation of semi-finished products, the possibility of aggregation of perfect binding machines into production lines. The emphasis is placed on an important operation in the technological chain of perfect binding – processing the book block spines before applying the adhesive. However, cutting tools are expensive, and their drives are energy-intensive, which do not always provide the prerequisites for high-quality perfect binding. The effectiveness of cutting tools for book block spine processing is shown that do not require an individual electromechanical drive. Theoretical scientific developments on the expediency of its application are relevant. A method in which, during the movement of the book block, it encounters by its spine on the sharpened at some angle screw cutting edge of the cylindrical cutting tool is proposed. The tool is freely mounted in bearings. Due to the interaction, strictly parallel slits are formed at the block spine at an angle to the direction of the block movement. It is noted that the contact of the screw cutting edge with the book block spine is determined by geometric parameters: the length of the contact arc and the angle of its coverage in the plane of the block transportation. According to calculation results, graphical dependencies are obtained. It is researched that the contact of the screw cutting edge with the book block spine, causes the rotational motion with the angular velocity of the cylindrical cutting tool. Analytical expressions to estimate the current vertical, horizontal and displacement of the cutting edge along the thickness of the book block are derived. The calculations are made, based on the results of which graphs are constructed. Differentiation of displacement dependences yielded expressions for finding the component of velocities of the cutting edge in three mutually perpendicular directions. The graphs of its dependence on the angle of rotation of the cylindrical cutting tool with different radius of the screw cutting edge are constructed. It is stated that the obtained results will be used to substantiate the rational parameters of the cutting tool and to study the mechanics of the cutting process by the auger cutting edge of the book block spine.

Keywords: book and magazine products, perfect binding, screw cutting edge, length of contact arc, coverage angle, movement, velocity.

doi: 10.32403/1998-6912-2021-1-62-95-104

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