Assessment of Wood Surface Quality Obtained During High Speed Milling by Use of Non-Contact Method

The created surface irregularities, namely roughness profile Ra, after the sawing of spruce, beech, and oak wood on a sliding mitre saw with manual saw blade feeding were studied. The created surface roughness was monitored at a cut height, e, of 50 mm using three basic modes of solid wood transversal sawing (flatwise cross-cutting at φ2=90°, flatwise edge-mitre cross-cutting, and flatwise mitre cross-cutting at φ2=45°). The monitored surface was made using a sliding mitre saw with the gradual application of saw blades with 24, 40, or 60 teeth, and special saw blade with 24 teeth and a chip limiter (CL), respectively. The saw blades used had identical angle geometries. Three levels of feed force, Fp, of 15, 20, and 25 N corresponding to a range of feed forces used by different operators were used in the experiment. The roughness of sawn surfaces was significantly influenced by cutting model, wood species, type of saw blade, and feed force. The created surface roughness values were very close to the plane milling values.

Section: Resultsmentioning

confidence: 99%

Roughness of Surface Created by Transversal Sawing of Spruce, Beech, and Oak Wood

Kminiak¹,

Gaff²

2015

“…Milling results in a high-quality surface and the exact dimensions required of the machined piece (plane, rotating, or shaped area) (Lisičan 1996;Novák et al 2011). Milling typically generates chips (Javorek and Oswald 1998).…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermal Treatment on Power Consumption during Plain Milling of Lodgepole Pine (Pinus contorta subsp. murrayana)

Kubš¹,

Gašparík²,

Gaff³

et al. 2016

This paper investigated the energy consumption differences during plain milling of thermally treated and untreated lodgepole pine wood (Pinus contorta subsp. murrayana). Thermal treatment was completed at four temperatures, which were 160 °C, 180 °C, 210 °C, and 240 °C. Power consumption measuring equipment was used for analysis in order to determine the cutting power of the milling process parameters during circumferential plain milling of lodgepole pine wood. The results indicated that the increase of cutting speed as well as feed speed caused a growth in cutting power. On the other hand, the increase of rake angle and thermal treatment temperature led to strong lowering of cutting power. The highest decrease (26.9%) in cutting power was caused by thermal treatment temperature 240 °C.

“…The geometry and cutting conditions can reduce the cost of wood cutting by increasing the cutting capacity of the machine (saw), with the appropriate tool selection (Řasa and Gabriel 2000;Novák et al 2011). …”

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.