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  • 1.
    Guo, Xiaolei
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering. Nanjing Forestry University, Faculty of Material Science & Engneering.
    Li, Rongrong
    Nanjing Forestry University, Nanjing Forestry University, Faculty of Material Science & Engneering.
    Cao, Pingxiang
    Nanjing Forestry University, Nanjing Forestry University, Faculty of Material Science & Engneering.
    Ekevad, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Cristovao, Luis
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Marklund, Birger
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Effect of average chip thickness and cutting speed on cutting forces and surface roughness during peripheral up milling of wood flour/polyvenyl chloride composite2015In: Wood research, ISSN 1336-4561, Vol. 60, no 1, p. 147-156Article in journal (Refereed)
    Abstract [en]

    Wood flour/polyvinyl chloride composite (WFPVCC) is a kind of composite material that, over the years, is becoming more popular in constructions applications. In this work, cutting forces and machined surface roughness were studied during peripheral up milling of WFPVCC under different average chip thickness which was obtained by adjusting rotation speed and feed rate at both high and low speed cutting conditions. The results indicated that cutting forces components, parallel force (F-x) and normal force (F-y) greatly varied during the cutting process. Maximum F-x, maximum F-y and surface roughness increased with the increase of average chip thickness. Maximum F-x and maximum F-y at high speed cutting conditions were lower than that at low speed cutting conditions at a same average chip thickness. The machined surface roughness at high speed cutting conditions was better than that at low speed cutting conditions at a same average chip thickness. When meeting the requirement of certain surface roughness, higher cutting speed can allow higher chip thickness and then decrease the tool wear than lower speed cutting condition. Maximum negative F-y had great impact in machined surface roughness. Machined surface roughness increased with the increase of maximum negative F-y. Thus, high speed cutting conditions not only increase the machining productivity, but also decrease machined surface roughness during the peripheral up milling of WFPVCC

  • 2.
    Guo, Xiaolei
    et al.
    Nanjing Forestry University, Faculty of Material Science & Engneering.
    Li, Rongrong
    Nanjing Forestry University, Faculty of Material Science & Engneering.
    Teng, Yu
    Nanjing Forestry University, Faculty of Material Science & Engneering.
    Cao, Pingxiang
    Nanjing Forestry University, Faculty of Material Science & Engneering.
    Wang, Xiaodong (Alice)
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Ji, Futang
    Shanghai Vohringer Wood Product Co., LTD.
    Effects of surface treatment on the properties of UV coating2015In: Wood research, ISSN 1336-4561, Vol. 60, no 4, p. 629-638Article in journal (Refereed)
    Abstract [en]

    The influence of the surface treatment of raw medium-density fiberboard on the properties of 1st ultraviolet putty coating film and the effects of primer coating arrangement on the qualities of 1st ultraviolet primer film were investigated. With regard to surface roughness and the recorded adhesion of the coating film, there were significant variations when the surface treatment was modified or when the coating arrangement was changed. The findings led to the conclusion that there was a close relationship between the surface treatment as well as the coating arrangement and properties of the coating film.

  • 3.
    Huang, Liangliang
    et al.
    Nanjing Forestry University, Faculty of Material Science and Engineering, Nanjing.
    Wang, Huiyun
    Nanjing Forestry University, Faculty of Material Science and Engineering, Nanjing.
    Guo, Xiaolei
    Nanjing Forestry University, Faculty of Material Science and Engineering, Nanjing.
    Jiang, Zhihua
    Power Dekor Group Co., Ltd., Danyang, Jiangsu.
    Xing, Feng
    Power Dekor Group Co., Ltd., Danyang, Jiangsu.
    Ekevad, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Study on continuous cold-pressing technology of engineered wood flooring with EPI adhesive2018In: Wood research, ISSN 1336-4561, Vol. 63, no 2, p. 335-342Article in journal (Refereed)
    Abstract [en]

    The effects of process parameters (adhesive spread, press time, and applied pressure) on the gluing performance of engineered wood flooring bonded with emulsion-polymer-isocyanate (EPI) adhesive were studied. The results showed (shear strength and aging test) that the major factors were adhesive spread and press time. The optimized parameters for best gluing performance of engineered wood flooring were 160 g.m-2, 14 s, and 60 s for adhesive spread, heat time, and press time, respectively, within certain ranges

  • 4.
    Lhate, Inacio
    et al.
    Eduardo Mondlane University.
    Cristovao, Luis
    Eduardo Mondlane University.
    Ekevad, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Machining properties of lesser used wood species from Mozambique2017In: Wood research, ISSN 1336-4561, Vol. 62, no 4, p. 635-644Article in journal (Refereed)
    Abstract [en]

    The present study was aiming at measuring cutting forces for wood of lesser used species from Mozambique such as Acacia nigrescens Oliv (namuno), Pericopsis angolensis Meeweven (muanga), Pseudolachnostylis maprounaefolia Pax (ntholo) and Sterculia appendiculata K. Schum (metil). Another aim was to use an expeditious method to compare performance of the species when cut. A machinability index calculated using Digraph and Matrix Methods was used for ranking the performance of the species when cut. Two different cutting tools 20o and 30o rake angle were used. Main cutting force in 90°-90° and 90°-0°cutting directions were measured by piezoelectric gauge. The results of the experiments showed that cutting forces followed normal trends to increase with density and decrease with increasing rake angle. The ratio between wood density and cutting forces in cutting directions 90°-90° and 90°-0° were 7 s2m-4 and 17.3 s2m-4, respectively. The most difficult species to be machined was Namuno, whereas the easiest species to be machined was Metil.

  • 5.
    Li, Rongrong
    et al.
    Nanjing Forestry University, College of Material Science and Engineering.
    Cao, Pingxiang
    Nanjing Forestry University, College of Material Science and Engineering.
    Guo, Xiaolei
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Futang, Ji
    Nanjing Forestry University, College of Material Science and Engineering.
    Ekevad, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Wang, Xiaodong (Alice)
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    A Novel Sawing Method for Small-Diameter Log2015In: Wood research, ISSN 1336-4561, Vol. 60, no 2, p. 293-300Article in journal (Refereed)
    Abstract [en]

    The commercial feasibility of sawmilling mainly depends on the expected productionyield. At the same time, the choice of sawing method is one of primary factors affecting yield.Therefore, choosing a reasonable sawing method is also necessary in small-diameter logs sawingprocess. In this study, a novel sawing method was proposed, and a comparison was made betweenthe volume yield for the most common sawing method in China, and the yield produced by anovel sawing method. This study shows that hexagon sawing give higher yield than the othersawing methods. The mean yield for the whole diameter range is: 82.7 % for hexagon sawing,53.3 % for live sawing, 56.7 % for hexagon sawing, 63.2 % for hexagon sawing.

  • 6.
    Li, Rongrong
    et al.
    Nanjing Forestry University.
    Guo, Xiaolei
    Nanjing Forestry University.
    Cao, Pingxiang
    Nanjing Forestry University.
    OuYang, Jing
    Nanjing Forestry University.
    Teng, Yu
    Nanjing Forestry University.
    Wang, Xiaodong (Alice)
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Optimization of Laser Cutting Parameters for Recombinant Bamboo Based on Response Surface Methodology2016In: Wood research, ISSN 1336-4561, Vol. 61, no 2, p. 275-286Article in journal (Refereed)
    Abstract [en]

    A means for selecting the optimal process parameters for the laser cutting of recombinant bamboo, based on the design of experiments (DOE) approach, was presented. Recombinant bamboo of thicknesses of 5, 10, and 15 mm was cut with a CO2 laser. The parameters investigated were the laser power, air pressure, and cutting speed. The results were compared using a number of process responses which define the efficiency of the cut, including the upper kerf (UK) width, lower kerf (LK) width, and the ratio of upper-to-lower kerfs. Mathematical models were developed to establish the relationship between the process parameters and the kerf parameters; special graphs were drawn for this purpose. Finally, a numerical optimization was performed to find out the optimal process settings at which the upper-to-lower kerf ratio would be minimized.

  • 7.
    Li, Rongrong
    et al.
    Nanjing Forestry University, College of Furnitures & Industrial Design, Nanjing.
    Xu, Wei
    Nanjing Forestry University, College of Furnitures & Industrial Design, Nanjing.
    Lu, Fang
    Nanjing Forestry University, College of Furnitures & Industrial Design, Nanjing.
    Cao, Pingxiang
    Nanjing Forestry University, College of Material Science & Engineering, Nanjing.
    Guo, Xiaolei
    Nanjing Forestry University, Faculty of Material Science and Engineering.
    Ekevad, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Non-standard test method for glue line shear strength2017In: Wood research, ISSN 1336-4561, Vol. 62, no 5, p. 825-830Article in journal (Refereed)
    Abstract [en]

    The relevant standards for glueline shear strength testing were summarized and analyzed in this paper. Depending on these existing test standards, the resulting stress in glueline is not pure shear stress, but a combination of shear and normal stresses. In order to overcome this deficiency, a symmetrical structure was proposed for making samples. Some comparative testing was accomplished by using these symmetrical samples, the results showed that the normal stress could be avoided during testing. These results were also confirmed by finite element method (FEM), the simulation results showed that the shear stress in glueline was uniform

  • 8. Urgela, S.
    et al.
    Wåhlin, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Elastic constants of a wooden plates derived from transient bending wave holographic interferograms1997In: Wood research, ISSN 1336-4561, Vol. 42, no 3, p. 23-36Article in journal (Refereed)
  • 9.
    Wei, Hong
    et al.
    Nanjing Forestry University, Faculty of Material Science and Engineering.
    Guo, Xiaolei
    Nanjing Forestry University, Faculty of Material Science and Engineering.
    Zhu, Zhaolong
    Nanjing Forestry University, Faculty of Material Science and Engineering.
    Cao, Pingxiang
    Nanjing Forestry University, Faculty of Material Science and Engineering.
    Wang, Baojing
    Nanjing Forestry University, Faculty of Material Science and Engineering.
    Ekevad, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Analysis of Cutting Performance in High Density Fiberboard Milling by Ceramic Cutting Tools2018In: Wood research, ISSN 1336-4561, Vol. 63, no 3, p. 455-466Article in journal (Refereed)
    Abstract [en]

    In order to study the cutting performance of TiC reinforced Al2O3 ceramic cutting tools in milling high density fiberboard, the effects of cutting parameter on the cutting forces, tool wear and cutting quality were investigated. Under the condition of same average chip thickness, feed per tooth and geometry angles, firstly, the change rate of maximum cutting forces were higher than that of average cutting forces at two different cutting speeds, and the cutting forces at high speed cutting was less than that at low speed cutting. Secondly, the flank wear at high speed cutting was more pronounced than that at low speed cutting, whose abnormal wear were pull-out of grain, cracking, chipping and flanking. Thirdly, the machining quality at high speed cutting was better than that at low speed cutting. Fourthly, the tendencies of cutting forces, tool wear and surface roughness relative to cutting length were similar, but the change rates were different, especially at the initial stage. Finally, high speed cuttingare plausible to use in HDF processing, which not only improves machining quality, but also promotes production efficiency.

  • 10.
    Zhu, Zhaolong
    et al.
    Nanjing Forestry University, Faculty of Material Science and Engineering.
    Guo, Xiaolei
    Nanjing Forestry University, Faculty of Material Science and Engineering.
    Na, Bin
    Nanjing Forestry University, Faculty of Material Science and Engineering.
    Liang, Xingyu
    Nanjing Forestry University, Faculty of Material Science and Engineering.
    Ekevad, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Ji, Futang
    Shanghai Vohringer Wood Product Co., Ltd.
    Research on cutting performance of ceramic cutting tools in milling high density fiberboard2017In: Wood research, ISSN 1336-4561, Vol. 62, no 1, p. 125-138Article in journal (Refereed)
    Abstract [en]

    The effect of cutting parameters and tool parameters on cutting forces and tool wear wereinvestigated in high density fiberboard (HDF) peripheral up-milling using toughened ceramiccutting tools. The results showed that whether at low speed cutting or high speed cutting, thetangential forces Ft and normal forces Fr increased slowly with the increase of cutting length. Thetangential forces Ft and normal forces Fr at low speed cutting were higher than that at high speedcutting. The tangential forces Ft and normal forces Fr decreased with the decrease of wedge anglein the same rake angle. Then, the effect of high cutting speed on the flank wear was greater thanthat at low cutting speed. The bigger wedge angle tools led to the serious flank wear. The mainwear pattern in milling HDF consisted of pull-out of the grain, flaking, chipping and cracking,the main wear mechanism were adhesive and abrasive wear

1 - 10 of 10
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