Resistance drilling: the effect of needle wear

IF 2.5 3区 农林科学 Q1 FORESTRY
Vilius Gendvilas, David J. Lee, Geoffrey M. Downes, Marco Lausberg, Jonathan J. Harrington
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引用次数: 0

Abstract

Semi-non-destructive drilling resistance instruments have been widely adopted for timber testing and forestry for wood quality assessments. The accuracy of a drilling resistance tool for predicting wood density may be affected by needle (drill) wear, and there is limited information regarding the wear behaviour of drill bits in wood resistance drilling. It is unknown when changes in needle sharpness and diameter become critical for quantifying wood density. To measure the effect of Resi needle wear, an IML Resi PD 500 was used to obtain cross-sectional traces of Southern Pine (Pinus elliottii var. elliottii (Engelm) × Pinus caribaea var. hondurensis (Sénéclauze)) average outerwood density: 519 kg/m³ and Spotted Gum (Corymbia citriodora subsp. variegata (F. Muell.)) average outerwood density: 779 kg/m³ logs. Southern Pine was tested with feed speeds of 200 cm/min at 3500 rpm and 100 cm/min at 5000 rpm. Spotted Gum was tested with a feed speed of 70 cm/min at 5000 rpm. A new needle was used for each setting. The effect of needle wear was tested after 0, 100, 200, 300, 400, 500, and 600 m of drilling depth. There was no effect on drilling resistance values up to 600 m of drilling length with feed speed 200 cm/min and 3500 rpm settings for Southern Pine. This would result in 2000 drilling measurements of 30 cm diameter trees. With alternative setting for Southern Pine with a setting of 100 cm/min feed speed and 5000 rpm, the increase in amplitudes was not significant until 300 m of drilling, after which, at 400 m, the amplitude increased by 2% (9.8 kg/m3), and after 600 m, the amplitude increased by 3.1% (15.2 kg/m3). For the hardwood Spotted Gum, the amplitude decreased by 0.9% (2.3 kg/m3) after 100 m, and after 300 m, the amplitude decreased by 3.3% (8.2 kg/m3). After 300 m, it was not possible to drill Spotted Gum due to extensive needle wear. The study highlighted the importance of needle wear in resistance drilling, providing guidance for reliable needle use to improve measurement accuracy and wood quality assessment.

阻力钻:针磨损的影响
半无损钻阻仪已广泛应用于木材检测和林业木材质量评价。用于预测木材密度的钻井阻力工具的准确性可能会受到针(钻)磨损的影响,而且关于木材阻力钻井中钻头磨损行为的信息有限。尚不清楚何时针尖和直径的变化对量化木材密度至关重要。为了测量Resi针磨损的影响,使用IML Resi PD 500获得了南松(Pinus elliottii var. elliottii (Engelm)) × Pinus caribaea var. hondurensis (ssamnsamuze))的横截面痕迹,平均外木密度为519 kg/m³,斑点胶(Corymbia citriodora subsp.)。variegata (F. Muell.))平均外层木材密度:779 kg/m³。南松在3500转时的进料速度为200厘米/分钟,5000转时的进料速度为100厘米/分钟。斑点胶在5000 rpm下以70 cm/min的进料速度进行测试。每次注射都用一根新针。在钻进深度为0、100、200、300、400、500和600 m时,测试了针磨损的影响。在进给速度为200厘米/分钟、3500转/分钟的情况下,在600米的钻进长度内,对南松的钻进阻力值没有影响。这将导致2000个直径为30厘米的树木的钻井测量。南松的备选设置为100 cm/min的进给速度和5000 rpm,振幅的增加在钻孔300 m之前并不显著,之后,在400 m时,振幅增加了2% (9.8 kg/m3),在600 m之后,振幅增加了3.1% (15.2 kg/m3)。硬木斑胶在100 m后振幅下降0.9% (2.3 kg/m3),在300 m后振幅下降3.3% (8.2 kg/m3)。钻进300米后,由于钻针磨损严重,无法钻出斑纹胶。该研究强调了针磨损在阻力钻孔中的重要性,为针的可靠使用提供了指导,以提高测量精度和木材质量评估。
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来源期刊
European Journal of Wood and Wood Products
European Journal of Wood and Wood Products 工程技术-材料科学:纸与木材
CiteScore
5.40
自引率
3.80%
发文量
124
审稿时长
6.0 months
期刊介绍: European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets. European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.
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