共查询到19条相似文献，搜索用时 203 毫秒
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通过对内圆锯片上的单颗金刚石磨粒进行运动状况的分析,推导计算单颗金刚石磨粒的切削厚度;通过理论推导锯切时内圆锯片与工件的接触弧长,建立内圆锯片所受锯切力与切入深度、进给速度、锯片转速和工件直径之间的关系. 相似文献
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通过监测系列锯切试验的主轴功率,分析锯切过程空载功率、有效锯切功率的变化规律,并结合材料去除率进行分析。结果表明,空载功率随锯切线速度增大基本呈线性增大。有效锯切功率随材料去除率呈近似线性增大。能效系数随材料去除率增大而增大,去除单位体积材料总能耗系数随材料去除率增大呈先快速后缓慢的减小趋势。总体上讲,高线速度锯切工艺直接增加空载功率,并不节能,适当提高材料去除率有利于低能耗加工。 相似文献
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通过分析后项动词的语义特征对日语复合动词「V+切る」的多义性进行考察,进而探讨「V+切る」语义变化的机制。考察结果显示,「V+切る」经历了由具体的受事切断义向受事分离义,进而向受事变化终结义、施事变化终结义的词汇层面的语义扩张以及语法化后由动作终结义、变化终结义向程度极限义的句法层面的语义扩张过程。复合动词「V+切る」的语义变化机制不仅受到前项动词的影响,而且还与受事的性质有着密切的关系。 相似文献
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当前高精度的光波导微模具飞切加工工艺相当烦琐,光学元器件的微模具结构已经全面进入应用阶段。在这样条件下,提出了光波导微模具飞切加工工艺的方法。高精度飞切加工工艺系统的模具材料是用硬铝来进行正交试验的。试验表明:对光波导微模具结构影响最大的是背吃刀量,主轴的旋转速率对微模具结构的影响也很大,进给量所给的影响就稍小了。再根据机床运作的稳定性和工作效率,最后确定了光波导微模具飞切加工工艺最适合的参数。这些参数为:背吃刀量为25微米,主轴的转动速率为每分钟800转,进给量为每分钟20毫米。然后再对工艺参数进行优化,最终确定微模具结构表面粗糙度是17.1纳米的波导微模具。 相似文献
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为达到将锯割制板改为切板制材、节约原料之目的,着重论述采用饱和汽蒸法软化白松切板工艺的应用技术与研究,收到明显效果。 相似文献
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分段切趾是光纤光栅一种新的切趾改进技术。针对线性啁啾光纤Bragg分段切趾的两个重要参数：分段切趾比例和分段切趾强度进行讨论。基于数值模拟的结果,以三分段切趾为例,分析两个参数对光栅性能的影响以及进行优化的方法。 相似文献
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模切机是印后包装加工成型的重要设备,模切机构是其核心,对模切机构的优化设计有利于提高模切机的工作性能。文章采用矢量复数法和杆长逼近约束条件法建立偏置式双肘杆模切机构的位移分析模型,在满足位移要求的基础上进行结构参数优化,即以一个运动周期内动平台转角和其后端垂直位移无限接近理想值为目标函数,从机构在工作过程中对构件位置要求及曲柄存在条件的角度出发建立约束函数,运用Matlab编程求解,得到符合要求的各构件尺寸。以优化后的尺寸进行实体建模和运动仿真,仿真结果与理论计算结果相吻合,由此验证了所建函数与计算程序的正确性。 相似文献
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在《微分几何讲义》中,仅用自然参数推导了曲线和平面问的切触阶,对于选用一般参数定义切触阶与自然参数的等价性未有证明,本文给出一个证明.下文中的n.γ均表示矢量。一、切触阶的定义设曲线 r:γ=γ(s)和平面π有公共点 P_0,其中 S 为Γ的弧长,不妨设弧长 S 从 P_0起 相似文献
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This paper studies the micro-cutting characteristics of aluminum alloy (2A12) based on a series of orthogonal experiments and finite element method (FEM) simulations. An energy-based ductile failure law was proposed in the FEM simulation. The simulated cutting forces and chip morphology were compared with experimental results. The simulation result indicates that there is a close relationship between the cutting force and cutting heat. The micro-cutting force decreases as the heat flux vector increases. Both the cutting heat and the micro-cutting force need a finite time to achieve a steady state. It is observed that with the cutting speed of 169.95 m/min and uncut chip thickness of 6 μm, the heat flux vector in the workpiece increases to a stable value after 0.06 ms; meanwhile, the principal cutting force decreases to a steady state correspondingly, i.e., the micro-cutting process achieves the steady state. It is concluded that the steady state micro-cutting simulation can reflect the cutting process accurately. 相似文献
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The grind-hardening method suitable for external grinding is proposed in this paper and the experiments are carried out on M1432B grinding machine. The hardened layer of the workpiece with cut depth 0.3 mm and speed 0.2 m/min is analyzed. The result indicates the metallurgical structure of the hardened layer is martensite and the top hardness value is 754 HV (about 62.3 HRC). At the same time, the grinding force, one of the most important factors of external grind-hardening process is modeled, and the measurement method is provided with elastic core dampers. The measurement result shows that the values of both the tangential force and the normal force increase when the cut depth increases, and the top value is 146 N and 656 N with the cut depth value of 0.4 Era. The increment speed and the value of the normal force are larger than the tangential force. 相似文献
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The structure characteristics of ID precision ultrathin monocrystalline silicon section cutting machine-tool spindle with force-monitoring bearings functioning as force measuring sensors were detected with the new Hilbert theory based signal-wave envelope detection method, presented to replace the conventional hardware device in order to ensure that the signal is measured online with high fidelity. According to the probability of anomalous incidents in the cutting process, a mathematical recognition model has been designed and verified on an STC-22ID machine. 相似文献
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A three. dimensional mathematical model for the transferred-type argon arc was developed to describe arc force on the anode surface. The software ANSYS was employed to solve the model. The model includes a part of torch and tungsten electrode to achieve m ore reasonable results. The arc temperature and flow fields were derived. And the influences of welding parameters on arc force were also studied. The simulated results show that arc pressure at the anode are dependent on the welding current, plasma gas flow rate and electrode neck-in, while not sensitive to arc length. 相似文献
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陈丽云 《天津职业院校联合学报》2006,8(2):28-30
通过对在数控车床上进行凹弧曲面加工的剖析,提出了一种根据凹弧尺寸要求,合理选择加工刀具的方法,从而避免因缺少依据而进行猜测或凭借加工经验选择刀具,防止造成刀具损坏和影响工件的加工质量。 相似文献
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磁悬浮（无轴承）电机利用磁场力使转子悬浮并驱动其实现高速或超高速旋转．基于传统电机技术提出一种交流圆弧电机原理,并按电磁轴承悬浮技术,水平方向对称于转子布置2个圆弧电机,垂直方向对称于转子布置2个圆弧电机,构成交流磁悬浮感应电机;建立电机在干扰作用下转子与定子间的间隙（气隙长度）变化规律,基于电磁理论建立了气隙磁感应强度的分布规律,利用虚位移原理建立电机电磁悬浮力和电磁转矩数学模型;通过有限元分析对磁感应强度、电磁悬浮力和电磁转矩等分布特性进行了仿真研究． 相似文献
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温志远 《广东轻工职业技术学院学报》2006,5(3):5-7
高速切削（HSC）以高的加工效率和高的加工质量为主要特征。工件已加工表面粗糙度为评价工件表面质量的重要指标。机床、刀具与工件材料是影响高速切削已加工表面粗糙度的外在关键因素,通过对铝合金高速切削条件下工件表面粗糙度形成过程及影响因素的深入分析研究、对降低工件已加工表面粗糙度方法和手段的探索,系统地分析了切削过程中表面粗糙度的控制因素。 相似文献
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Separate characteristic of the tangential ultrasonic vibration assisted grinding(TUAG)machining is analyzed based on TUAG process, and a critical speed formula is given to correctly set the machining parameters to insure the separate characteristics of TUAG process. The critical speed is not only related to the ultrasonic vibration amplitude and frequency, but also to the grinding wheel velocity and the cutting point space, and the grinding force can be decreased during the TUAG process with separability. Grinding force experiments are conducted, and the experimental results are in good agreement with the theoretical results. 相似文献