重组竹砂带磨削中磨削参数对表面粗糙度的影响研究

重组竹是一种力学性能优异的新型竹材人造板,被广泛应用于制品生产和建筑装修等行业。由于缺乏理论研究,在重组竹磨削加工中存在着许多问题,为此本文研究了磨削参数对重组竹表面粗糙度的影响。实验结果表明:进给速度、砂带速度和磨削压力对其表面粗糙度没有显著的影响;磨削厚度为0.2mm和0.3mm时,Ra、Ry和Rz的值最小,RSm和磨削厚度之间无显著关系;随着砂带磨料粒度增大,Ra、Ry和Rz先增大后减小,呈三次幂变化趋势,拐点分别是60目和100目,RSm呈线性减小趋势;砂带磨料粒度与Ra、Ry和Rz的灰色关联度最高,砂带速度与RSm的灰色关联度最高。     

单磨粒磨削研究对探明木质材料砂带磨削机理的意义

砂带磨削具有高效磨削、"冷态"磨削、弹性磨削的突出特点,其对于拥有纤维结构的木材来说更易于加工成型和形成良好的表面质量。现有关于木质材料砂带磨削的理论研究很少,多为参照金属磨削理论在宏观层面展开磨削参数对磨削力、磨削效率和功率、工件表面粗糙度等的影响,从而制约了木质材料砂带磨削朝着高效、强力磨削方向发展。国内外关于金属单磨粒磨削的研究较多,如采用实验法和有限元法对金属磨削过程展开研究。鉴于木质材料和金属之间的材料特性差异,针对金属的磨削理论研究结果对于木质材料仅具有一定参考意义。本文主要介绍了单磨粒磨削方法在金属上的研究进展及对其在木质材料砂带磨削上的应用。     

平面磨削金属结合剂金刚石节块的实验研究

本文研究了一种铁基结合剂金刚石节块的氧化铝砂轮平面磨削。通过在线测量水平和垂直方向磨削力,研究了氧化铝砂轮平面磨削加工金刚石节块过程中的法向力、切向力、力比以及磨削比能变化特征。观察了磨削后的金刚石节块表面特征。比较了逆磨和顺磨条件下的磨削特征。结果表明,顺磨条件下的法向力、切向力以及磨削比能均高于逆磨,但是切向力与法向力的比值在两种磨削方式下基本相同。     

磨削木竹材表面粗糙度对胶合强度的影响

采用探针法测定了水曲柳、毛竹和落叶松砂带磨削表面的粗糙度,分析了影响表面粗糙度的因素,并采用心理分析方法讨论了的粗糙感与表面粗糙度关系;还分析了木材表面粗糙度对胶合强度的影响.为获得不同树种及不同粒度砂带磨削对工件表面粗糙度和粗糙感的影响,实验测量了磨削工件表面的粗糙度和粗糙感触觉心理量、视觉心理量.研究结果表明,材种和表面组织构造影响表面粗糙度;表面粗糙度值因为材种不同而不同,随着加工精度的提高而降低;水曲柳、毛竹和落叶松表面粗糙感的触觉心理量与视觉心理量呈正相关;阔叶材、竹材、针叶材表面粗糙感的触觉心理量与视觉心理量的相关性逐渐增大;触觉心理量与表面粗糙度参数的相关性要高于视觉心理量.砂带磨削木竹材表面的胶合强度在磨削砂带柱度为100～150目时达到最大值.     

木材磨削表面粗糙度对胶合强度的影响

采用探针式表面粗糙度测定法,测定了水曲柳、红松、落叶松和榆木砂带磨削的表面粗糙度,分析了磨料粒度对木材表面粗糙度以及胶合强度的影响。研究结果表明：磨削砂带粒度越大,磨削表面粗糙度不一定越好;木材表面胶合强度并不随着表面粗糙度减小而线性增加,表面越光滑,胶合强度不一定就越好。     

宽带砂光机磨削正压力及橡胶带的优化配置

宽带砂光机磨削时当磨削厚度较大或工件尺寸小、质量轻时,工件极易发生反弹。为了从根本上解决这一问题,在测定工件与进料带摩擦系数的基础上,通过对磨削过程中磨削力、法向力和正压力的受力平衡分析,寻求一个最小正压力,从而使工件能够顺利进给。本文分析了选用不同的橡胶进料带,在不同材种、不同的磨削厚度时工件受力情况,确定了工件进给所需的最小正压力,实现了磨削正压力和橡胶带的优化配置。     

金刚石砂轮平面磨削花岗石的实验研究

研究了花岗石的金刚石砂轮平面磨削。通过在线测量水平和垂直磨削力，研究了金刚石砂轮平面磨削加工两种天然石材过程中的法向力和切向力变化特征。建立了单颗磨粒承受平均切向和法向负荷与单颗磨粒最大切削厚度之间的对应关系。结合扫描电镜观察结果，探讨了两种花岗石的去除机理。     

宽幅砂带磨削工艺在人造板热压板制造中的实践和思考

介绍在我国人造板机械制造业中,采用宽幅砂带磨削工艺加工大幅面热压板的具体实践,并对有关宽幅砂带磨削工艺的效率、质量和成本等问题进行了分析和讨论。     

基于砂带磨削原理的分析与应用

从国内外发展和应用的现状出发,阐述了砂带磨削的原理、特点及砂带机床的主要机构,并介绍了一个砂带磨床设计的实例。     

砂轮磨削木材的研制

用砂轮磨削木材,加工木材的表面已经受到国外重视。日本在50年代初就有人作过研究,近年来外国不断地发表文章、专著,使理论研究不断深化、完善,而且逐日开始用于生产实际中。用砂轮加工木材表面与传统的砂带加工具有明显的优越性,砂轮的耐用度远远高于砂带,加工精度、质量也优于砂带,生产效率一般是砂带的2～3倍,尤其是砂轮具有     

木材磨削切削力研究进展

概述了近年来磨削技术及理论研究的最新进展,其中包括磨削机理、磨削力建模和磨削力研究方法,还介绍了几种典型的木材磨削力实验研究的方法,以及个别材种的最佳磨削加工条件.     

基于田口法的木制品异形表面砂光参数优化研究

用条状刷式砂光方式对木材进行砂光实验,以加工工件表面粗糙度为优化目标,利用田口法对砂带目数、条状刷式砂轮转速、进给速度、理论接触长度、砂光次数等砂光参数进行优化,再根据试验得出多个因素不同水平的平均表面粗糙度和信噪比(S/N),利用SPSS软件进行实验结果分析,研究各砂光参数对表面粗糙度影响的显著性,得出最优砂光参数组合,并对此最优砂光参数组合进行了实验验证。     

木材刷式砂光机砂光参数的选择(2)

以刷式砂轮砂光试验机为砂光设备,以砂轮转速、进给速度、砂光次数为砂光参数,测量砂光参数与表面粗糙度Ra之间的关系,得出了在本实验条件下较理想的砂光条件.     

Research on GA-BP neural network model of surface roughness in air drum sanding process for poplar

Roughness is an important property of wood surface and has a significant influence on the interface bonding strength and surface coating quality. At present, there is little research on theoretical models for poplar fine sanding. In this study, poplar wood was fine-sanded with an air drum. An orthogonal experiment was carried out to study the effects of abrasive grain size, feed rate, belt speed, air drum deformation and air drum pressure on the surface roughness of poplar wood. The simulation models of the longitudinal roughness and the lateral roughness of the sanding surface were established based on BP neural network optimized by genetic algorithm (GA-BP neural network), and verified by the experimental data. The results show that the influence of sanding parameters on longitudinal roughness and lateral roughness is similar. The order of influence is abrasive grain size?>?belt speed?>?feed speed?>?air drum deformation and air drum pressure. The longitudinal roughness and lateral roughness of the surface of the poplar can be well predicted by GA-BP neural network. The average relative error of the predicted longitudinal roughness and lateral roughness are 2.67% and 2.65%, respectively.

     

Dust-generation characteristics of hardwoods during sanding processes

A study of the factors that influence dust-generation during the sanding process of Malaysian hardwoods was undertaken. It was found that the amount of wood removed during the sanding process predetermined dust-generation, although the wood density and abrasive grit used also played a role. Consequently, low density wood species produced higher dust-concentration due to its relative ease of sanding, and vice-versa. The results of the study suggest that minimizing dust-generation during the hardwood sanding process could be achieved by ensuring minimal amount of wood removal as well as the use of the coarsest possible abrasive grit in the process.     

Optimizing the abrasive sanding process of rubberwood (Hevea brasiliensis)

The abrasive sanding process is the most labor-intensive operation in the Rubberwood furniture manufacturing industry. Although the machining properties of Rubberwood (Hevea brasiliensis) are well established, information on its abrasive sanding characteristics is sparse. This study was carried out to establish the optimal abrasive sanding regime for Rubberwood. The results suggest that the abrasive sanding process can be optimized when well machine-planed Rubberwood stocks are used. Further, it was found that when the machine surface quality was good, abrasive sanding with a two-level sequence of grit sizes was sufficient to produce an acceptable surface smoothness. The improved surface smoothness also minimized the coating film spread on the wood surface. This finding will serve as a useful benchmark for machine-planing and abrasive sanding processes in the high-volume Rubberwood furniture manufacturing industry.     

纯棉磨毛床用纺织品印花

阐述宽幅纯棉磨毛床用纺织品的生产工艺,包括前处理、柔软拉幅、磨毛、印前拉幅整纬、印花以及印后整理等;提出了生产中的注意事项,以解决对花难、折皱、拖色、搭色等问题,并减少了磨毛布强度损失,改善了染色牢度.     

Untersuchungen über das Bandschleifen von Holz mit geradliniger Schnittbewegung

Summary Tests have been made on a special belt sander to study some relations in wood sanding. Specimens of spruce, pine, poplar, alder, red beech, oak, and teak wood have been used as test material. The influence of various factors has been investigated by determination of the volume of abrased wood and the main cutting force. These factors are species of wood, direction of fibre, size of sanding area, belt speed, pressure, and grit sizes. Results: The volume of abrasion is influenced by structure, strength, and wood extractives and increases with sanding perpendicular to the grain. With constant pressure volume of abrasion increases in proportion to reduction of sanding area. The optimum belt speed as determined by the specific quantities of abrasion is 30 m/s for grit size 60 and slightly less than 30 m/s for grit size 120. The influence of grit size is mainly determined by smaller volumes of abrasion for finer grits and higher sensibility against high pressures.

---

---

Mitteilung aus dem Versuchsfeld für Holzbearbeitung der Technischen Hochschule Braunschweig     

超硬材料砂带的研究现状和发展趋势

文章介绍了超硬材料砂带的基本结构和性能特点,讨论了超硬材料砂带国内及国外研究现状,并由此分析了其未来发展趋势。