| Author(s) | Collection number | Pages | Download abstract | Download full text |
|---|---|---|---|---|
| Shustykevych A. I., Ternytskyi S. V., Vatuliak Yu. V. | № 2 (78) | 11-15 |
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The peculiarities of performing the operation of paper or cardboard bending have been described, which greatly facilitates the formation of a bend, avoids cracking of the ink layer and has a positive effect on the quality of the finished product. The methods of bending used in printing industry have been considered. The advantages of rotary bending compared to crucible method have been presented. It has been shown that when rotating the disk instruments in two mutually perpendicular directions, there is a need to change the direction of motion of the sheet when drawing the bending lines. The complication of sheets transportation means negatively affects productivity, energy consumption and complicates the design of the equipment. In order to eliminate the need to reposition the sheets in the process of cardboard bending, it is suggested to cross the cylinder equipped with a special screw bending tool. The analysis of the literature showed that information on the geometrical parameters of the screw bending tool is missing.
The article describes the method of calculating the geometric parameters of a screw tool for cross rotational bending. Analytical dependencies for determining the length of the contact plane of a screw tool with a cardboard sheet have been presented. The influence of the structural features of the bending tool on the length of the contact plane with the cardboard has been given. The schemes for determining the angle of installation of a cylinder with a screw bending tool and determining the end angles t1 and t2 have been presented in the article. It has been found that the length of the contact plane of the tool with the cardboard is influenced by such parameters as the diameter of the cylinder, the pitch of the screw line, the thickness of the cardboard. The predetermined length of the contact plane will make it possible to estimate the magnitude of the cardboard bending force with a screw tool.
Keywords: cardboard, bending cylinder, bending tool, screw line, installation angle, contact plane length.
doi: 10.32403/0554-4866-2019-2-78-11-15
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