共查询到20条相似文献,搜索用时 62 毫秒
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针对类椭圆形螺杆泵定子模芯结构复杂、加工难度高的问题,通过对类椭圆形螺杆泵定子线型形成原理的研究,确定定子模芯轮廓线,分析定子模芯轮廓线结构特点,确定定子模芯的加工需要两把不同的成形刀具。依据端截面设计成形铣刀廓形加工时存在干涉,确定了依据定子法截面截形设计成形刀具,通过坐标变换建立了定子模芯螺旋曲面特性方程,与接触条件式联立求解接触方程,获得成形刀具廓形,并根据曲率半径对刀具与工件进行干涉检查,验证刀刃廓形设计的正确性,为类椭圆形螺杆泵定子模芯成形铣刀廓形设计提供了理论基础。 相似文献
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复杂螺旋曲面铣削加工刀具的廓形设计 总被引:2,自引:0,他引:2
针对螺杆压缩机第三代型线的特点,研究用于螺旋曲面加工的铣削刀具的廓形设计.文章依据刀具回转面与螺旋曲面的包络原理,以用于螺旋曲面加工的铣削加工刀具--盘形铣刀的设计为研究对象,采用微分几何曲线曲面的构建方式,首先建立了螺旋曲面的特性方程,然后根据刀具与工件的接触条件建立接触线方程;提出了加工螺旋面用盘形刀具廓形设计的基本理论和方法,并通过实例验证了盘形刀具设计的理论计算公式.结果表明,铣削加工螺旋曲面的盘形刀具截形设计的关键是建立接触线方程,借助Matlab软件进行数值运算而求出刀具廓形的坐标是精确的,且能够满足产品设计要求. 相似文献
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成形铣削时的铣刀是以与工件形状相匹配的廓形来切削工件,形成相应的工件外形.在SolidWorks软件的三维设计环境中模拟工件和刀具在实际加工时相互位置关系,利用其三维造型功能完成成形铣刀三维实体设计及前刀面内的投影视图,从而精确设计出铣刀廓形,显著提高成形铣刀的设计和制造的质量和效率. 相似文献
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简要介绍非圆等距廓形的加工方法;通过对无冲击封闭非圆等距廓形的研究、分析,推导出形成无冲击封闭非圆等距廓形的条件以及廓形方程;对非圆等距廓形的数控加工方法进行研究,通过对步进电动机、AC伺服电动机、DC伺服电动机、伺服液压马达以及直线伺服电动机性能的分析、对比,提出在现行的通用数控加工系统中常用的四种驱动元件不能满足非圆等距廓形车削加工系统的要求,而采用直线伺服电动机为驱动元件的驱动装置适用于非圆等距廓形的车削加工系统. 相似文献
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复杂曲面数控磨削是一种重要的精加工手段,但当前都是采用砂轮的理论廓形进行编程。砂轮制造误差和磨损对加工精度影响较大,砂轮修形精度要求较高。提出基于砂轮包络廓形的复杂曲面精加工技术,其原理是通过检测砂轮发生包络作用的实效廓形,并采用最小有向距离算法进行基于砂轮包络廓形的复杂曲面数控加工刀位轨迹计算。在砂轮磨损后可以通过重新测量其包络廓形,按照磨损后的包络廓形重新进行刀位轨迹计算。该方法能有效的提高加工精度和加工效率,同时降低复杂曲面包络法磨削时对砂轮精度的要求。 相似文献
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渐开线圆柱齿轮体积的算法研究 总被引:2,自引:1,他引:1
分析并阐述了渐开线的生成原理和特性,以及渐开线齿形的结构特点。进一步阐述了直齿、斜齿和变位3种不同类型渐开线圆柱齿形零件齿形面积与齿体积的计算方法,并推导出了相应的渐开线齿形面积与齿体积的计算公式。应用该算法的结论,可为渐开线圆柱齿形零件加工的设计计算提供极大便利。 相似文献
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Phase-field simulations of solidification of Al-Cu binary alloys 总被引:4,自引:0,他引:4
The dendrite growth process during the solidification of the Al-4.5%Cu binary alloy was simulated using the phase-field model, proposed by Kim et al. Solute diffusion equation and heat transfer equation were solved simultaneously. The effects of the noise on the dendrite growth, solute and temperature profile in the undercooled alloy melt were investigated. The results indicate that the noise can trigger the growth of the secondary arms, and increase the highest temperature and solute concentration, but not influence the tip operating state. The solute and temperature gradients in the tip are the highest. 相似文献
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The dendrite growth process during the solidification of the Al-4.5 %Cu binary alloy was simulated using the phase-field model, proposed by Kim et al. Solute diffusion equation and heat transfer equation were solved simultaneously. The effects of the noise on the dendrite growth, solute and temperature profile in the undercooled alloy melt were investigated. The results indicate that the noise can trigger the growth of the secondary arms, and increase the highest temperature and solute concentration, but not influence the tip operating state. The solute and temperature gradients in the tip are the highest. 相似文献
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型材立体冲裁模设计与制造 总被引:1,自引:1,他引:0
介绍一种铝型材立体冲裁模的结构和工作原理,分析立体冲裁的难点和相应对策,模具巧妙地利用锯形刃口对型材竖边和壁厚大的部分进行锯切加工。经生产实践验证:模具结构可靠,经济效益明显。 相似文献
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Yeong-Eun YOO Tae-Hoon KIM Tae-Jin JE Doo-Sun CHOI Chang-Wan KIM Sun-Kyung KIM 《中国有色金属学会会刊》2011,(Z1):148-152
A plastic plate with surface micro features was injection molded to investigate the effect of pressure rise of melt on the replication of the micro structures. Prism pattern, which is used in many optical applications, was selected as a model pattern. The prism pattern is 50 μm in pitch and 108° in the vertical angle. The overall size of the plate was 335 mm×213 mm and the thickness of the plate varied linearly from 2.6 mm to 0.7 mm. The prism pattern was firstly machined on the nickel plated core block using micro diamond tool and this machined pattern core was installed in a mold for injection molding of prism patterned plate. Polymethyl methacrylate (PMMA) was used as a molding material. The pressure and temperature of the melt in the cavity were measured at different positions in the cavity and the replication of the pattern was also measured at the same positions. The results show that the pressure or temperature profile through the process depends on the shape and the size of the plate. The replication is affected by the temperature and pressure profiles at the early stage of filling, which is right after the melt reaches the position to be measured. 相似文献