Bolesław Porankiewicz
Adam Mickiewicz University in Poznań
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Featured researches published by Bolesław Porankiewicz.
Wood Science and Technology | 2005
Bolesław Porankiewicz; Jakub Sandak; Chiaki Tanaka
The wear of high speed steel cutting tools after milling wood of four selected wood species was studied. For the experiments wood specimens were chosen with very different silica contamination, wood density, and high temperature corrosivity (HTC) of wood towards tool material. Analyses performed show that the silica content and wood density display poor linear correlation with the cutting tools’ wear, while the correlation of the HTC appeared very good. The silica contamination and the HTC effects overshadow each other. Thus, a theoretical multivariable simulation of the cutting edge wearing process, employing all experimental variables, was applied, providing a very good explanation of the analyzed problem.
Wood Science and Technology | 2006
Bolesław Porankiewicz; P. Iskra; Jakub Sandak; Chiaki Tanaka; Karol Jóźwiak
Dulling of high-speed steel (HSS) cutting tools after milling five wood species has been analyzed. The wood investigated varied in mineral contamination, high-temperature corrosivity (HTC) and density (D). Experiments performed proved that up to date methods for evaluation of mineral contamination in wood should be improved. A new pipe-like form of mineral contamination particles was evidenced. The correlation between the presence of 3D aggregates of silica in wood and high content of K and Ca in the ash was established. Employing multivariable theoretical simulation method, the combined effect of mineral contamination, HTC and wood density on the tool dullness appeared to be a reasonable explanation of the results obtained.
Wood Science and Technology | 2003
Bolesław Porankiewicz
A method based on thermal gravimetric analysis (TGA) was developed to evaluate the chemical properties of particleboard causing high-temperature corrosion (HTC) of cemented carbide tool material. A descriptor (RMSMI) characterizing HTC of material machined on the tool material was established and proved. The analysis of the relation between cutting edge wear (VBW) and cutting conditions, including corrosive properties and the chemical composition of the tool material used, resulted in a multifactor statistical model. An improvement of cemented carbide composition for milling particleboard is proposed. An attempt to analyze a synergistic effect (SE) between HTC and mechanical wear while particleboard milling was performed.
Wood Science and Technology | 2006
Bolesław Porankiewicz
Theoretical simulation of cutting edge wearing when milling wood and melamine coated particle board based on stochastical and analytical methods is presented. Abrasion, high temperature corrosion (HTC) and frictional wearing effects are discussed. Results of computations show good correlation between the observed and predicted wear rate for three different experiments. Relations between predicted tool wear rate from HTC, content (CCP) and size (SCP) of particles of hard mineral contamination and density (D) of cut material is also presented and discussed.
European Journal of Wood and Wood Products | 1996
Å. S. Lundberg; Bolesław Porankiewicz
The quality of wood surfaces after different kinds of machining processes is a property of great importance for the wood processing industries. Present work is a study, whose objective was to evaluate different non-contact methods, for measurement of the quality of the wood surfaces by correlating them with stylus tracing. A number of Scots Pine samples were prepared by different kinds of wood machining processing. Surface roughness measurements were performed, utilizing two optical noncontact methods. The results indicate that the laser scan method can measure surface roughness on sawn wood with a sufficient degree of accuracy.
European Journal of Wood and Wood Products | 2015
Bolesław Porankiewicz; Karol Jóźwiak; Daria Wieczorek; Ireneusz Idzikowski
An attempt to assess recesses on the rake face after milling wood laminated with polyvinyl acetate (PVA) based glue is presented. Several analytical methods were employed to explain tribo chemical corrosion reactions (TCCR) leading to formation of specific form of wear on the rake face. By means of thermal gravimetric analysis it was confirmed that cobalt and tungsten carbide—main components of sintered carbide cutting edge—were subjected to intensive TCCR. Although an increase in thermal stability of the PVA based glue after modification was evidenced, high temperature degradation of the glue to acetic acid was probably the primary source of TCCR. Catastrophic wear of the cemented carbide cutting edge was also evidenced as the final state of continuous deepening of the recess on the rake face near the cutting edge.
Tribology Letters | 2002
Bolesław Porankiewicz
In this paper, evidence of tribochemical reactions of a cutting-edge material during cutting of secondary wood products (SWP) is reported. The heat of frictional contact of the cutting edge with material of the SWP is a source of rapidly increasing temperature in the cutting zone. Once the cutting edge reaches a certain level of wear, the temperatures generated are high enough to initiate thermal decomposition of the basic components of the material being cut. Applying Quantum Chemical (QC) methods, with semiempirical results verified using Density Functional Theory (DFT), it was determined that some products of thermal degradation of the principal components of SWP stabilize cobalt, from the cobalt binder in cemented carbide tool material, in an oxidized state via octahedral hydroxy organometallic complexes.
Maderas-ciencia Y Tecnologia | 2014
Bolesław Porankiewicz; Giacomo Goli
In this work the multi-factor, non-linear dependencies between main (tangential) FC and normal (radial) FN cutting forces upon two machining parameters by up-routing and down-routing wood of Douglas fir (Pseudotsuga Menziesii) and Oak (Quercus petraea) were evaluated. The relationships are graphically illustrated and discussed. The obtained data were compared with cutting forces evolution models according to grain orientation from the literature in order to verify if literature statements or models comply with measured data. Evidence of several contradictions was found relative to results from available literature.
Bioresources | 2011
Bolesław Porankiewicz; Bengt Axelsson; Anders Grönlund; Birger Marklund
Bioresources | 2007
Bolesław Porankiewicz; C E Julio Bermudez; Chiaki Tanaka