气鼓轮砂带砂光饰面中密度纤维板的磨削力与表面粗糙度OA北大核心CSTPCD
Sanding Force and Surface Roughness of Air-Drum Belt Sanding Finished MDF
[目的]探究气鼓轮砂带砂光参数对磨削力的影响以及磨削力与砂光表面粗糙度的关系,为更好控制气鼓轮砂带砂光木(板)材的表面粗糙度提供理论参考.[方法]开展气鼓轮砂带砂光饰面中密度纤维板的单因素试验,运用流体腔理论建立气鼓轮砂带砂光饰面中密度纤维板的有限元模型,基于有限元模型和单因素试验,探究气鼓轮气压、进给量、轴平行度误差对磨削力和砂光表面粗糙度的影响,并分析磨削力与砂光表面粗糙度的关系.[结果]随着气鼓轮气压、进给量、轴平行度误差增加,试件总磨削力增大,但其引起总磨削力增大的原因不同;试件接触中心节点法向应力大小主要与气鼓轮气压有关;对应同一试件的中间区域(6～59 mm),气鼓轮气压组和进给量组试件的局部磨削力近似相等,轴平行度误差组试件的局部磨削力与位置近似线性相关;气鼓轮气压对试件磨削力和表面粗糙度影响较小,进给量可较明显改善试件表面粗糙度;试件表面粗糙度与局部磨削力的线性拟合相关系数R2 为 0.975,与总磨削力的线性拟合相关系数R2 为 0.871,表面粗糙度与局部磨削力的线性相关性更好.[结论]气鼓轮砂带砂光饰面中密度纤维板的有限元模型可以准确计算试件磨削力;分析气鼓轮磨削力与试件砂光表面粗糙度的关系时,选择试件局部磨削力比试件总磨削力和试件法向应力更好.
[Objective]In order to provide theoretical reference for better controlling the sanding surface roughness of the wood board with air-drum belt sanding,the effect of sanding parameters on grinding force and the relationship between grinding force and sanding surface roughness were studied.[Method]The main research contents included:we carried out the single factor tests on the air-drum belt sanding MDF(medium-density fiberboard),established the finite element model of the air-drum belt sanding MDF,based on fluid cavity theory.By combining the finite element model with the single factor tests,we investigated the influence of air drum pressure,feed rate and axis parallelism error on the sanding force and the sanding surface roughness,and analyzed the relationship between sanding force and surface roughness.[Result]With the increase of air drum pressure,feed rate and axial parallelism error,the sanding force of the specimen increased,but the reasons for the increase of the sanding force were different.The normal stress at the contact center of the specimen was mainly related to the air pressure of the air drum.Corresponding to the measuring point in the middle area(6-59 mm),the local sanding force of the specimen in the air drum pressure group and the feed group were approximately equal,and the local sanding force of the measuring point was approximately linearly related to the position during contact of the specimen in the axial parallelism error group.The air pressure of the air drum had little effect on the sanding force and surface roughness of the specimen,while the feed rate can significantly improve the surface roughness of the specimen.The linear fitting correlation coefficient R2 between the surface roughness of the specimen and the local sanding force was 0.975,the linear fitting correlation coefficient R2 with the total sanding force was 0.871,and the linear correlation coefficient between the surface roughness and the local sanding force is better.[Conclusion]The finite element model of the air-drum belt-sanded MDF can accurately predict the sanding force of specimen.When analyzing the relationship between the grinding force and the surface roughness of specimen,choosing the local grinding force of specimen is better than the total grinding force and the normal stress of specimen.
刘彩梅;伍希志;吴雨阳;李贤军
中南林业科技大学材料科学与工程学院 长沙 410082
林学
表面粗糙度中密度纤维板有限元模型磨削力
surface roughnessmedium density fiberboardfinite element modelsanding force
《林业科学》 2024 (003)
131-140 / 10
中国博士后科学基金项目(2021M690768);湖南省自然科学基金项目(2020JJ5986).
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