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本文采用辊压适张度技术,利用动态测试的方法和计算机模态分析软件,研究了圆锯片在不同适张度状态下模态固有频率的变化规律。 相似文献
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为探寻激光冲击手段对于圆锯片预应力场的影响规律,在合理的简化与假设的基础上,利用ABAQUS软件中的静力学与动力学求解模块,建立了圆锯片激光冲击适张过程的理论分析模型;利用应变采集仪,对圆锯片激光冲击后的预应力场进行了实测,理论与实测结果吻合较好。仿真与实测结果表明:圆锯片激光冲击后,外缘生成了一定量级的切向拉应力,具有适张效果;通过调整激光冲击区域的大小、位置以及分布形式,能够对圆锯片外缘的切向拉应力数值进行有效调控。 相似文献
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《工具技术》2021,(9)
高速旋转的硬质合金圆锯片工作时易受到离心应力的作用产生离心刚化效应,对其动态稳定性产生影响。针对此现象,运用ANSYS软件对圆锯片进行预应力模态分析,得出其不同转速下的离心应力矢量分布情况、模态振型及固有频率。运用激光位移传感器对高速旋转状态下的圆锯片进行试验,分析时间、速度变量对圆锯片动态特性的影响规律,并建立圆锯片轴向位移振幅预测模型。结果表明:随着转速增大,圆锯片各阶固有频率增加,轴向位移振幅减小且波形趋于平缓,其动态稳定性获得提升;圆锯片旋转时间的增加能减小其轴向位移振幅,首次装夹的圆锯片在旋转20min左右达到稳定状态,该研究为圆锯片生产提供指导依据。 相似文献
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A flexible circular saw, which can be used in a novel machining process for high-speed carbon fiber-reinforced plastic (CFRP) plate cutting, was developed. In this process, the saw is deflected like a bowl-like shape. A cross-section of the saw body then forms a circular arc. A curved line can therefore be cut without interference by the bowl-like deflection. In addition, the radius of the cross-section of the saw body can be controlled by adjusting the deflection. This process therefore allows curves to be cut with a varied radius using a single saw. This process can carry out high-speed curved-line cutting with a feed rate of 3 m/min on a CFRP plate. However, it is difficult to cut free-form curves using a flexible circular saw. Therefore, in this research, a new technique that can cut free-form curves using a flexible circular saw was proposed. Then, a cutting test applying the technique was carried out. 相似文献
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采用仿真分析的方法研究了火车轮径向锯切过程中锯缝宽度的变化以及锯缝附近踏面上应力/应变的变化规律。分析表明,当锯切深度达到轮辋与辐板连接处时,锯缝附近残余应力的释放已经十分充分,可根据残余应力的释放情况计算踏面上残余应力的大小。按照径向锯切方法,在锯缝附近粘贴应变片,径向锯切到轮辋与辐板连接圆弧处时停止锯切,依据应变片记录的应变值可计算踏面上的残余应力。 相似文献
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0 INTRODUCTIONInthewood productsindustry ,oneormorehydro dynamicallylubricated guidepadsarewidelyusedtominimizethetransversevibrationofthesawblade ,increasecuttingefficiency ,producekerflossesandimprovecuttingaccuracyandsurfacequality IwanandStahl[1] haveco… 相似文献
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针对圆锯片切割石材的复杂非线性动力学行为,依据硬脆材料断裂机理,基于ANSYS/LS-DYNA建立了锯片-石材切割系统的有限元仿真分析模型。动态模拟了切割过程中石材锯路的生成以及石材颗粒的断裂、破坏过程,模型采用对称罚函数接触算法和动力学方程的显式中心差分求解方法,并基于LS-PREPOSTD后处理获得加工系统的动力学响应。结果显示了不同切割时刻锯片表面和石材内部的应力分布情况,能够直观形象地确定模型最先破坏的区域,揭示了石材微观破碎、裂纹生成及成屑机理。仿真结果证明了建模方法的可行性与正确性。 相似文献
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在给出圆薄板的非线性电磁弹性耦合运动基本方程及电磁力表达式的基础上,得到在横向稳恒磁场、环向电流和机械载荷共同作用下简支圆薄板的振动方程,并采用四阶Runge-Kutta法求解方程,得出圆板的弹性变形及应力状态.通过变化磁感应强度和电流密度,使系统由周期状态进入混沌状态;由分岔图与最大Lyaponov指数图判定系统是否进入混沌状态;并讨论磁场与电流对系统应力状态的影响. 相似文献
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Wear of saw teeth for timber cutting has been evaluated with the objective to establish an experimental method for saw steel development. Laboratory test results are compared to wear as determined in a case study. The case study was made on band saw tools, exhibiting abrasive, corrosive, cracking and chipping wear mechanisms. Laboratory tests were performed cutting pine wood using the martensitic saw steel grade, UHB 15LM, hardened and tempered to 1370 MPa tensile strength. The parameters, cutting speed, feed and depth, were chosen to be similar to saw mill conditions. A circular plate with two saw teeth was set up in a milling machine and each tooth was run a total cutting length of 10 000 m, equivalent to a normal 8 h work shift in a saw mill. Wear mechanisms were identified and characterised. The test method was found to simulate the saw mill conditions, and future wear studies using extreme cutting process parameters are possible. 相似文献
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线性分布载荷作用下双模量圆板的计算分析 总被引:1,自引:0,他引:1
双模量圆板在线性载荷作用下,会形成各向同性的拉伸区和压缩区.可将双模量圆板看成两种各向同性材料组成的层合板,采用弹性理论建立双模量圆板在外载荷作用下的静力平衡方程,利用此静力平衡方程即可确定双模量圆板的中性面位置.建立双模量圆板在外载荷作用下的弯曲微分方程,求得双模量圆板在线性分布载荷作用下的挠度方程.通过算例讨论分析双模量对圆板弯曲变形的影响,得到圆板材料拉压弹性模量相差较大时,其挠度计算不宜采用相同弹性模量经典薄板理论,而应该采用双模量薄板理论的结论. 相似文献