共查询到19条相似文献,搜索用时 234 毫秒
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在圆锯锯切时,开发一种最佳适应性控制系统来自动控制工件的进给速度以产生所要求的工件表面粗糙度。本研究中开发的系统包括与数控圆锯机相连接的适应性控制器。本系统在加工过程中由监测器连续测定声发射讯号和切削力。在加工过程中适应性控制器提供的讯号用于评估表面粗糙度并自动调节工件进给速度。 相似文献
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为了预测木工带锯加工切削面的弯曲和粗糙度,探讨其控制方法。我们采用钨铬钴合金锯齿的木工带锯条,在无锯卡状态下,研究与锯剖弯曲有关的锯条位移、切削力、进给力、声发射计数(AE)与吃刀量、锯切速度、张紧应力、木材材质的关系,以分析探讨带锯条位移的预测方法。 相似文献
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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。 相似文献
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砂光机的进给系统和吸尘装置 总被引:1,自引:1,他引:0
砂光机的进给系统是保证对工件表面进行连续磨削所必不可少的部件。功能有: 1.带动工件沿进给方向运动,并承受切向磨削力; 2.支承工件并承受法向磨削力; 3.调节进给速度,具有一定的调速范围; 4.调节工件的磨削厚度,单面砂光机的进给系统多为带式传动结构,见图1。无端 相似文献
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Reynolds Okai 《Holz als Roh- und Werkstoff》2009,67(2):189-195
Productivity, surface quality, and recovery are three parameters that compete for attention during lumber production. The well known phenomenon of improved surface quality with decreasing workpiece feed rate has been reported by several researchers. This paper reports on experimental results from the relationship between workpiece feed rate or bite per tooth and the surface roughness of Japanese Sugi (Cryptomeria japonica) using a bandsaw machine whose feed-carriage is coupled to the bandsaw frame. The volume of sawdust produced during sawing was determined using an electronic balance. Equation was developed to determine the kerf-losses. It was observed that as the workpiece feed rate increased, or as the bite per tooth increased, the saw blade vibration decreased and the volume of sawdust also decreased contrary to expected results. Furthermore it was observed that with increasing workpiece feed rate the surface roughness decreased contrary to expected results. On the other hand, when the carriage feed rate increased the saw blade deviation also increased as expected. The research findings clearly suggest that when there is vibration coupling between the feed-carriage and the entire bandsaw frame, the amplitude of the saw blade vibration and the surface roughness decrease as the bite per tooth increases. Thus the bandsaw machine whose frame is coupled to the feed-carriage is a promising technique for increasing lumber recovery and improving upon surface quality. 相似文献
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An adaptive control optimization system was developed to produce a desired surface finish roughness by automatic control of the work-piece feed-rate in circular sawing. The system developed in this study consists of the interconnection of an adaptive controller with a numerically controlled circular saw. The AE signals and cutting forces were measured to monitor the machining process continuously in this system. The signals were provided to the adaptive controller to evaluate the surface finish roughness and adjust the workpiece feed-rate automatically in the machining process. Sensing of AE signals and of cutting forces was compared to determine which technique is more convenient. Experiments were carried out with a carbide-tipped circular saw. Cross cutting was done with counter-cutting during the experiments. The cutting parameters controlled were workpiece feed-rates and cutting speeds. Japanese beech (Fagus crenata Blume) and Yezo spruce (Picea jezoensis Carr.) were used as the workpiece. Experimental results indicated that adaptive control optimization took place in the system developed for circular sawing. The desired surface finish roughness was produced by automatic control of the workpiece feed-rate using the sensing technique of AE signals as well as that of cutting force. However, the system using AE signals is more convenient than taht using cutting force. 相似文献
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介绍金刚石串珠绳锯的结构以及加工原理。以7×7—4.9钢丝绳为例,介绍金刚石串珠绳的结构设计,原料及表面镀层选择,生产过程控制。通过改善钢丝绳结构,选用线接触作为新一代金刚石串珠绳的生产结构,钢丝绳的理论破断拉力最高可以提升8%;选用SW87盘条作为做金刚石串珠绳的原料;半成品钢丝表面镀层采用电镀黄铜,可以提高金刚石串珠绳耐疲劳磨损性能;综合考虑制绳钢丝抗拉强度和扭转性能的匹配,选择总压缩率为85%~90%。捻制时,利用张力测试仪进行动态模拟测试,保证每根股的张力在49~58.8 kN,预张拉力为成品绳破断拉力的10%~15%。生产结果表明,新一代金刚石串珠钢丝绳达到了高破断拉力、低伸长率以及良好的耐疲劳磨损性能的技术要求。 相似文献
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影响盘条表面处理质量的主要因素 总被引:7,自引:6,他引:1
论述高碳钢丝所用盘条拉拔前进行表面处理过程中,酸洗、高压水冲洗、磷化、皂化等工序的不同工艺参数及其对盘条表面处理质量的影响,给出最佳参数及调整范围,同时给出磷化膜厚度和面质量关系的对应表。实践证明拉拔速度6~7 m/s,磷化膜厚度10~15μm时拉拔效果最佳。 相似文献
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从工艺参数、成型模具、成型材料3方面的影响综述了微注塑制品微结构重复性的研究进展,并对未来的研究方向进行了展望。工艺参数方面侧重于熔体温度、模具温度和注射速度等,成型模具方面则集中在模具结构和模腔粗糙度。图4参26 相似文献