Finding the Equilibrium Conditions of the Processing Object in the Machine-Tool-Wood System of Sawmill Unit

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UDС

674.093: 621.914.1

DOI:

10.17238/issn0536-1036.2015.1.117

Abstract

The equilibrium conditions of the processing object in the machine-tool-wood system of the sawmill unit were considered for one of its possible variations, for the cross-cutting unit. Its use is a rational way to increase the yield and quality of pulpchips, especially under buck of short sections of boards, processing of which is inefficient on traditional equipment - chippers. Machine-tool-wood system of sawmill unit c conditionally have been viewed as a rod system with two degrees of static indeterminacy, subordinated to the main position of the elasticity theory. The method of the structural mechanics forces was applied for the disclosure of static indeterminacy of the system. Unknowns of the system under construction the equations of deformation were applied force system parameters corresponding to the amount of redundant connections according to this method. Dependences were obtained to determine the minimum die hold-down pressure of board under milling, deformation parameters in the machine-tool-wood system of cross-cutting unit, and distribution diagrams of bending moments and longitudinal forces in this system were built. Analysis of distribution diagrams and obtained dependences showed the following. Counter cross-milling with top location of board is the most rational to ensure equilibrium conditions. It is essential to use a compulsory hold-down of board. This is a prerequisite process of cross-cutting by milling with the required indexes of quality products. Based on these results the rational design and technological parameters of the milling process, when is cross-cutting of boards, is necessary to determine. These parameters at best (optimal) should ensure minimization of raw material and energy costs in the development of saw-timber and pulpchips according to the requirements of resource saving. This is true not only for cross-milling by stepped circular cutter, but also for longitudinal milling by face-conical (conical) and circular cutter, which are used in a varieties of milling equipment besides considering cross-cutting unit.

Authors

V.V. Taratin, Candidate of Engineеring, Associate Professor

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, 163002 Arkhangelsk, Russia; е-mail: taratinvjacheslav@rambler.ru

Keywords

equilibrium, processing object, system MTW (machine-tool-wood), sawmill unit, resource saving requirements.

References

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