摘要
研究定组态砂带(PSA)的寿命极限,能够完善砂带寿命评价系统,为推动木质材料用砂带的研发和实际生产提供指导。制备了一种碳化硅PSA,对中密度纤维板(MDF)进行精磨试验,分析材料质量、粗糙度、表面形貌、磨粒高度等数据,得到材料去除量、磨削表面质量以及砂带磨损趋势,通过灰色模型预测变化趋势,探究了砂带的寿命极限和评判方法。研究表明:以材料去除量为砂带寿命评判标准时,通过建立GM(1,1)灰色模型预测PSA寿命,其理论磨削长度为37875 m,是普通传统砂带的1.63倍,是棕刚玉PSA的1.26倍;以磨削表面粗糙度(S_(a))为评判标准时,通过分析MDF的S_(a)变化趋势,得出其理论磨削长度为26625 m,是普通传统砂带的1.44倍;当量磨粒高度下降超过52.58%和40.72%时,砂带达到材料去除量和磨削表面粗糙度的寿命极限。加工目的不同,砂带寿命极限的判定标准也不同:加工目标为定厚砂光时,根据材料去除量的下降率判定砂带寿命,此时灰色预测模型精度较高,具有优势;以表面精磨为加工目的时,当MDF表面粗糙度下降到稳定值后突然增加或数据变分散时,砂带寿命达到极限。砂带磨粒高度随磨削不断降低,降低到一定程度时,砂带因磨粒不稳定和表面黏结、堵塞胶黏剂等物质,无法继续有效磨削,最终达到寿命极限而失效。
This study aims to analyze the lifespan of precision-shaped abrasive belts(PSAs)that used for medium-density fiberboard(MDF)accurate sanding,which is crucial for further exploring PSA performance,promoting the development and manufacture of abrasive belt for wood materials,and improving the evaluation system of its lifespan,so as to provide guidance for actual production and processing.In this study,a silicon carbide PSA was designed and prepared,and a sanding testing machine was developed to perform precise sanding tests on MDF.Material removal amount was obtained with precision analytical balance,surface roughness(S_(a)),surface topography,and equivalent abrasive height data were obtained by the 3D surface profile instrument.Data analysis provided insights into changing trends of material removal amount,sanding surface quality,and wear condition of PSA to explore the lifespan and evaluation methods.Additionally,the Grey Model GM(1,1)was employed to predict the lifespan of PSA based on data trends.When material removal quantity was used to evaluate the lifespan of PSA,the GM(1,1)model was established to predict the lifespan based on the relationship between material removal amount and sanding times.The theoretical sanding length was 37875 m,surpassing 1.63 and 1.26 times of ordinary abrasive belt and brown corundum PSA.When the sanding S_(a)was used to assess the lifespan of PSA,the analysis of the trend of MDF S_(a)showed that PSA reached its lifespan after 355000 sanding times,corresponding to a theoretical sanding length of 26625 m,which was 1.44 times of ordinary abrasive belt.When the decrease rate of equivalent abrasive particles height exceeded 52.58% and 40.72%,it was signaled that the life limits for material removal and sanding S_(a)were reached.Different processing goals dictated varied criteria for determining abrasive belts lifespan limits.For the fixed thickness sanding the decline in material removal served as a critical indicator.PSA demonstrated an overall decline in material removal.The gray prediction model demonstrated high accuracy and several advantages.For surface sanding,the lifespan was identified when the surface roughness value of the MDF dropped to a stable value and increased abruptly or the degree of dispersion increased.The abrasive height of PSA decreased progressively during sanding.Once it diminished to a critical level,the PSA lost its effectiveness in sanding due to the unstable state of the abrasive particles and bonding,blocking adhesives or other substances,thus leading to failure and reaching its service life.
作者
李春瑜
杜瑶
杨冲
罗斌
李黎
张树丽
LI Chunyu;DU Yao;YANG Chong;LUO Bin;LI Li;ZHANG Shuli(Key Laboratory of Wooden Material Science and Application of Ministry of Education,Key Laboratory of Wood Science and Engineering of Beijing,College of Materials Science and Technology,Beijing Forestry University,Beijing 100083,China;AICA Guangdong Co.Ltd.,Zhaoqing 526100,China)
出处
《林业工程学报》
北大核心
2025年第5期47-54,共8页
Journal of Forestry Engineering
基金
国家自然科学基金(32271787)。
关键词
定组态砂带
中密度纤维板
砂带寿命
灰色预测模型
precision-shaped abrasive belt
medium density fiberboard
lifespan
grey prediction model
