【作者】 周兰美；

【导师】 金维洙；

【作者基本信息】 东北林业大学 ， 机械设计及理论， 2005， 硕士

【摘要】 该论文选用白桦和红松两种树种、10种切屑厚度(0.5～5mm,中间间隔是0.5mm)和刃倾角为0~0、10~0、20~0、30~0的四把刀具进行横向和纵向切削,对LVL用刨切单板切削力和单板质量进行研究。实验结果表明单板厚度、刃倾角对切削力和质量分别有不同的影响。 就切削力来说:纵向切削时主切削力和垂直分力,单板厚度小于3mm时都随单板厚度增加而增大,红松随刃倾角增加切削力下降,而白桦有所变化;但他们在单板厚度大于3mm时切削力并不都随单板厚度增加而增大。横向切削时主切削力和垂直分力基本都随单板厚度增加而增大,随刃倾角增加而下降。就横向和纵向主切削力比较而言,横向主切削力小得多,白桦横向主切削力仅为纵向的0.36倍,红松横向主切削力仅为纵向的0.56倍。 就单板质量来说,横向切削时的质量明显好于纵向切削。纵向切削时影响单板表面质量的主要因素是背裂、毛刺和撕裂;横向切削时影响单板表面质量的主要因素是背裂和端部劈裂、毛刺和撕裂。白桦横向切削的单板表面质量比红松好得多,但无论是横向切削还是纵向切削,刃倾角为20~0时质量是最好的。 建议生产中取刃倾角为20~0,横向刨切的白桦单板厚度控制在5mm以内,横向刨切红松单板厚度控制在3mm以内;纵向刨切白桦和红松单板厚度控制在3.5mm以内,此时单板质量是最好的。更多还原

【Abstract】 Two kinds of wood species: Betula platyphylla and Pinus koraiensis, ten chip thicknesses: 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm and four different kinds of oblique angles of cutting edge for test tools: 0° ,10°, 20°, 30° are consisted in this test. We studied cutting forces and qualities of the sliced veneer used in the laminated veneer lumber in the 90-0 and 0-90 oblique cutting conditions. The result is that cutting forces and veneer quality are affected by veneer thickness and oblique angles of cutting edge.As for as the cutting forces: In the 90-0 cutting condition, the main cutting force and vertical component force are increased with the increasing veneer thickness when the veneer thickness is less than 3mm, the cutting force of Pinus koraiensis is decreased with the increasing oblique angles of cutting edge, but the cutting force of Betula platyphylla is not. In the 0-90 cutting condition, the main cutting force and vertical component force are increased with the increasing veneer thickness and decreased with the increasing oblique angles of cutting edge for both species. In comparison with the 90-0 cutting condition, the main cutting force is smaller in the 0-90 cutting condition, which ratio is 0.36 times when cutting Betula platyphylla and 0.56 times when cutting Pinus koraiensis.As for as veneer quality, the surface quality is better in the 0-90 cutting condition. The main cause which affect the surface quality is peeling split, wooly grain and torn grain in the 90-0 cutting condition and peeling split、 end split、 wooly grain and torn grain in the 0-90 cutting condition. The veneer quality of Betula platyphylla is better than Pinus koraiensis in the 0-90 cutting condition. The oblique angle of 20 is best in the 90-0 and 0-90 cutting conditions.The best cutting condition as follows: the oblique angle of 20 should be used. The thickness is less than 5 mm when cutting Betula platyphylla and less than 3 mm when cutting Pinus koraiensis in the 0-90 cutting condition. The thickness is less than 3.5 mm in the 90-0 cutting condition.更多还原