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《林业机械与木工设备》1986,(5)
隔热传导锯片隔热传导锯片,是利用隔截切割摩擦热在锯体上传导的原理,而在平板圆盘锯片上开出若干条孔的一种新型锯片。隔热传导锯片具有如下优点: 1.由于条孔隔截了切割摩擦热的正常传导,所以减少了锯片的变形和偏摆。 相似文献
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左明 《林业机械与木工设备》1992,(5)
圆锯机的特点是刀轴转速高、惯性大、制动困难,生产过程中的噪声、振动和劳动强度大,容易发生工伤事故。圆锯伤人的原因,一是由于操作失误手触及锯片,二是在锯割中遇到木料过湿、有节疤或锯片磨损变钝等因素造成的木料弹崩伤人。为了防止发生事故,必须安装防护装置。 相似文献
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文章论述了一种圆锯片适张状态的检测方法及实现的系统 .该方法采用锯片适张前后固有频率的变化幅度 ,锯片单点加载情况下一定半径圆周上的横向变形量和端面圆跳动三个特征参量 ,表述一个锯片的适张程度、适张均匀性和平整性 .应用计算机控制的检测系统 ,经过对大量不同规格木工锯片和大型金刚石锯片的检测 ,结果表明该方法是切实可行的 相似文献
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针对传统板材锯切设备大多数处于半自动化状态,且存在加工精度低、出材率低、安全性差等缺点,笔者提出一种用于毛边板材裁边的纵剖优选锯设备的主轴调整系统。通过对毛边板材的裁边工艺进行分析,利用三维软件对纵剖优选锯主轴调整系统结构进行实体建模,确定了纵剖优选锯主轴调整系统的总体结构。对主轴组件上的锯片切削力和切削功率进行详细的设计计算,完成了主轴调整系统的主轴组件、锯片调整组件等结构的设计研究。根据锯片滑台最大许用应力和最大变形量对其进行有限元静力学仿真分析,通过仿真结果校核得出的锯片滑台满足设计要求。设计的纵剖优选锯主轴调整系统结构具有适用于产品多规格、高出材率、高自动化和实用性强的特点。 相似文献
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本文介绍了连续式两锯片横截锯的技术性能、结构设计、特点与应用,本锯机对于实现制材生产线的连续化,提高产品质量与生产效率,节省投资具有一定的作用和实用价值。 相似文献
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利用非线性理论和矩阵摄动理论,研究了离心力场,切削温度场及辊压适张度位置对圆锯片动态特性和临界转速的影响,对离心力场,切削温度场共同作用下锯片最佳辊压适张处理位置进行了计算分析,还分析了锯夹半径对最佳辊压位置的影响。 相似文献
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割灌机圆锯片对齿尖高度一致性的要求很高,圆锯片孔和定位垫圈孔的安装间隙可能引起的偏心必须予以考虑.文章提出了符合切削原理且经生产实践验证的齿形参数推荐值,并论述了锉磨的具体方法。 相似文献
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加热适张度是利用氧一乙炔焰,将锯身的一定部位加热,使该部在冷却收缩中产生同辊压张力一样的变形,从而获得适张度。圆锯片气焊加热适张度机配有带锯夹锯装置,可用于圆、带锯的加热适张度及辊压处理,实现了一机多用。经该机修整的锯片,具有作业时间短、适张度均匀且不易消失,锯末端加热部分不易变形,厚度均匀,锯切质量高等优点。 相似文献
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Operation safety during sawing operations as well as dimensional accuracy and surface roughness depend on circular saw dynamic
features among other factors such as circular saw blade accuracy and static/dynamic properties of the machine tool. Manufacturers
of saw blades have an obligation to mark tools with a value stating the maximum allowed rotational speed for each saw. However,
in some cases the value indicated on the saw corresponds to the critical rotational speed or is dangerously close to this
critical value. Saw operation at the critical rotational speed is inadvisable and may result in serious injury or depreciation
of product quality. This report outlines a simple methodology for evaluation of circular saw critical rotational speed. The
assessment was conducted with a camera vision technique on the basis of an impulse test. Results are compared with theoretically
calculated critical rotational speeds and the marks on saw blades. 相似文献
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文章在分析讨论了影响圆锯片极限转速的一些重要因素后认为 ,包括锯片材料、结构、尺寸、内应力影响的最低共振临界转速是制约锯片极限转速的重要因素 .考虑到诸多影响因素后 ,文章建议圆锯片的最高极限转速以不超过该锯片未适张时的最低临界转速的 50 %~ 6 0 %较为适宜 相似文献
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隔振器式张紧系统带锯机是在原杠杆压砣式张紧系统带锯机的基础上加以改进而形成的一种新式带锯机。通过采用MATLAB软件对带锯机锯条振动实验数据进行分析,从而证明改进后的带锯机锯条振动明显小于原杠杆压砣式带锯机。 相似文献
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ABSTRACTThis paper investigates the effect of rotation speed and vibration response of a circular saw on the sawing process of Douglas-fir wood. An idling test was conducted on a guided circular saw to determine its stable operation speeds and vibration behavior. Short-time Fourier transform analysis was performed on saw idling test data, and variation of excited frequencies of the blade as a function of rotation speed was obtained. The saw blade critical speeds and the rotation speeds that correspond to saw flutter instability were identified. Then experimental cutting tests were conducted at different cutting conditions and the effect of rotation speed and saw vibration response on cutting power consumption and sawing accuracy was investigated. The results showed that conducting a saw idling test and vibration response analysis can identify the saw critical and flutter speeds, which is essential for identifying the optimum rotation speed of circular saw. There was a significant increase in power consumption when cutting at super-critical and super-flutter speed. The effect of rotation speed on sawing accuracy is complex and nonlinear. This effect interacts with feed speed, which makes it difficult to generalize sawing accuracy versus rotation speed in the circular sawing process. 相似文献