Dynamic strength of end mills when processing wood and composite materials in panel house building

Saint-Petersburg State Forest Technical University, Saint-Petersburg, Russian Federation

^* Corresponding author: 910sav@gmail.com

Abstract

The endurance of end mills during operation is determined by the bearing capacity of the working part of the housing and the wear resistance of the teeth. The bearing capacity of the working part is its ability to absorb the arising loads from the cutting forces and to provide rigidity and strength of mill. The required strength of end mills is determined by their design parameters and working conditions. A feature of the working conditions of end mills during the processing of chipboards and composite materials in panel house-building is that milling occurs with a depth of two cutting diameters. Therefore, at the most rational feeds on the tooth, the mills experience significant loads, leading to elastic extraction bending of the working part and, often, to their breakage. During milling of chipboards and composite materials in panel house building, rapid wear and dulling of the side cutting edges of end mills is associated with uneven thickness of the processed materials. The presence in plates of more dense layers filled with binder causes zones of local intense wear. Thus, the presence of abrasive wear inclusions in plate and composite materials leads to rapid wear and dulling of the mill tooth, causes an increase in energy consumption during the milling process. The forces acting on the mill by the cutting resistance force cause elastic extraction of the spindle-mill system, friction of rear surfaces against the material being processed, that leads to the heating and breaking of mills. Hence, low bearing capacity and wear resistance of end mills determine their short durability.