Surface Quality of Milled Birch Wood after Thermal Treatment at Various Temperatures

The mean arithmetic deviation of the roughness profile was investigated during cylindrical milling of the board edges. The machined materials were a medium-density fiberboard, medium-density fiberboard with single-sided lamination, and edge-glued spruce panel. Contactless and contact profilometers were used to measure the roughness. Both methods were evaluated and compared. Tungsten carbide blades with three different compositions and treatments were used. The effect of the cutting speed (20 m/s, 30 m/s, 40 m/s, and 60 m/s) and feed rate (4 m/min, 8 m/min, and 11 m/min) on the surface roughness was also monitored. The results of this study compared two different methods for determining the surface roughness. The measurements were more accurate with a contactless profilometer, but the price is higher than that of the contact method. The operation was also more complicated, and the measurement itself took longer with a contactless profilometer. The evaluation of individual surface quality variables was faster with a contact device. The best results in terms of the surface quality were achieved by lowering the feed rate and increasing the cutting speed.

Section: Introductionmentioning

confidence: 99%

Medium-density Fiberboard (MDF) and Edge-glued Panels (EGP) after Edge Milling - Surface Roughness after Machining with Different Parameters

Sedlecký¹,

Kvietková²,

Kminiak³

2018

“…), and the produced wood chips (size, grain size distribution, etc.) depend on the physical and mechanical properties of the machined material; the shape, size, number of teeth, geometry, sharpness of the cutting tool; and the technical and technological conditions of the machining process (Kilic et al 2006;Barcík and Gašparík 2014;Krilek et al 2014;Gaff et al 2015;Kvietková et al 2015;Gaff et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Cutting Power during Cross-Cutting of Selected Wood Species with a Circular Saw

Kminiak¹,

Kubš²

2016

This study assessed the effect of selected factors, such as the feed force (Ff = 15, 20, and 25 N), wood species (beech (Fagus sylvatica L.), English oak (Quercus robur L.), and spruce (Picea abies L.)), and the number of saw blade teeth (z = 24, 40, and 60) on cutting power in the cross-cutting of lumber. The cutting was done using a circular saw with a rotating motion of the saw blade at a constant cutting speed (vc) of 62 m.s -1 . The tangentially bucked lumber had a relative humidity (wr) of 12% ± 1% and a thickness (e) of 50 mm. For the experiment, four circular saw blades with SK plates, a uniform diameter (D = 250 mm), and identical angular geometry (angle of clearance (α) = 15°, wedge angle (β) = 60°, and rake angle (γ) = 15°) were used. The saw blades had a different number of teeth (z = 24, 40, and 60), and one saw blade had 24 teeth and a chip limiter. The aim of this study was to expand the knowledge about the resulting cutting performance with different combinations of technological process parameters.

“…Milling tests show the important role spindle speed plays on the evolution of the surface roughness as a function of material removal rate (Davim et al 2009). On the other hand, higher cutting speeds corresponded to a lower surface roughness (Kvietková et al 2015). In a study by Yang et al (2012), wood species and sanding had significant influence on the surface machining roughness and adhesion strength.…”

Section: Introductionmentioning

confidence: 92%

Determination of the Effect of Surface Roughness on the Bonding Strength of Wooden Materials

Söğütlü¹

2017

The purpose of this study was to determine the effect of surface roughness on bonding strength in Oriental beech, cherry, Scots pine, and Taurus cedar woods. In conformance with this objective, after planing the wooden materials under different conditions, their surface roughness values were determined in accordance with various standards using scanning equipment. The bonding strength test specimens were prepared using polyvinyl acetate (PVAc) and polyurethane (PUR) adhesives after the wooden materials were separated into three groups of varying surface roughness values, after which bonding strength experiments were carried out. The data obtained from the experiments were evaluated statistically at a 95% level of confidence. According to the test results, the highest bonding strength was obtained in the Oriental beech (9.27 N/mm 2 ), whereas the lowest bonding strength was obtained in the Scots pine (3.65 N/mm 2 ). There was not a statistically significant difference between the bonding strength of the cherry and Oriental beech woods. The PVAc adhesive (7.61 N/mm 2 ) produced more successful results than the PUR adhesive (5.63 N/mm 2 ). Furthermore, it was found that in the specimens with low surface roughness values for each wood type and used adhesives had high bonding strengths.