共查询到20条相似文献,搜索用时 125 毫秒
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介绍了一种利用Pro/E5.0软件实现对回转工作台参数化建模的方法,大大提高了回特工作台设计的效率,缩短台面工艺结构的开发周期,提高设计质量.同时采用Pro/E5.0软件的运动仿真分析功能对其在运动过程中速度、加速度、位移等参数进行采集与分析,为回转工作台的工作性能指标的预评价、制造加工提供了重要的理论依据. 相似文献
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船用中速机空冷器壳体斜面法兰在卧式加工中心加工时,由于工作台旋转,导致基准丢失,无法通过直接测量建立加工坐标系,可巧妙利用工作台回转中心机械坐标为一个相对固定值的特点,结合空冷器壳体和工作台的位置关系,编制数控宏程序来解决斜面法兰坐标系的建立问题。此方法也适用于其它类似零件的加工,推广意义巨大,有助于提高加工效率和加工精度。 相似文献
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陈杰 《机械工人(冷加工)》2007,(6):54-55
众所周知,用等分回转加工出来的工件,其精度与回转工作台的等分精度相关。为了提高回转工作台的等分精度,首先要精确地测量出回转工作台各等分角的实际值,与回转精度标准要求或设计要求比较,然后对定位装置进行修正。经过多次测量和修正,使回转各等分精确地达到规定的精度标准要求或设计要求,以确保加工产品的质量。回转工作台等分角的测量方法很多, 相似文献
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五坐标数控机床后置处理算法的研究 总被引:8,自引:0,他引:8
分析了带倾斜转台和倾斜摆头两种特殊五坐标数控机床结构形式,给出了详细的后置处理算法;根据给定的刀位数据,计算出了各坐标轴的运动量,为在CAD/CAM软件中进行后置处理提供了数学基础。 相似文献
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定量式静压转台动态特性建模与影响因素分析 总被引:1,自引:0,他引:1
静压转台的动力学性能对转台的综合性能有较大影响,所以对转台在动载作用下响应的深入研究对于转台优化设计及提升转台的综合性能有重要作用。根据Christensen的模型计算考虑表面粗糙度的情况下静压转台支承油垫及预压油垫的非线性承载力。建立多油垫转台的多自由度动力学模型,应用龙哥库塔法计算转台在均载及偏载时转台的响应及转台的稳定时间和稳态油膜厚度,分析表面粗糙度、转台初始油膜厚度、转台支承及预压油垫进油流量、转台转动对转台动态特性的影响。结果表明偏载使得转台的动态性能下降并使转台的某些支承油垫油膜厚度出现较大幅度降低。较小的油膜初始厚度和较大的流量可以提升转台的动态性能,而表面粗糙度等因素对于转台的动态特性也有比较明显的影响其中周向粗糙度倾向与提高转台性能而径向粗糙度则倾向于降低转台性能。所建的模型及分析结论将为转台的优化设计及转台综合性能的提升提供理论基础。 相似文献
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为解决平面二次环面蜗杆数控磨床加工中出现形位超差和精度不足的问题,通过研究磨床的整体结构和转台工况确定了扇形静压转台的主体结构方案和设计参数,通过理论计算推导出承载力与位移率和面积比的关系和刚度与压力比与面积比的关系,根据面积比最优计算得到油垫的承载力和刚度,并利用FLUENT软件分别对口字型和工字型油腔结构的油垫进行流体力学仿真分析,证明计算得到的油腔尺寸参数可以使转台产生足够的承载力,满足磨床设计要求,分析了矩形油垫中不同的油腔内部结构,得到口字型油腔结构比工字型油腔结构产生的更大承载能力且承载更均匀,油腔内部无内壁阻隔更适合于静压油腔选型的结论。 相似文献
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为充分挖掘数控机床的加工潜能,针对BC型双转台五轴数控机床坐标关系,建立其运动学模型,并经逆向运动学求解,推导出该型机床后置处理的转角计算公式和坐标转换计算公式。为进一步提高该型机床加工精度,在分析转角变化情况后,提出了避免突变的处理方法。针对采用线性插补法加工产生误差较大的问题,提出了采用球面插补法进行加工和计算,并根据推导结果,开发了基于UG的后置处理程序。经试验验证,该后置处理程序能满足使用要求。 相似文献
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In this paper, two systems for the measurement of the error motion and angular indexing of a rotary indexing table have been developed. A laser diode, a laser holder and a position sensitive detector (PSD) are integrated as a simple measuring device for the measurement of the rotary error without using a precision reference artifact (a cylinder or a sphere), multiple probes or error separation methods. The laser diode is assembled in the laser holder and fixed on the rotary table. The PSD is set up above the laser holder to detect the position of an incident laser beam from the laser diode. When the rotary table rotates, the rotary error changes the direction of the incident beam and also the position of the spot on the PSD. For the measurement of the angular indexing, a reflective diffraction grating and two PSDs are integrated as a high-resolution angle measuring device without using an autocollimator or a laser interferometer system. The diffraction grating is set at the center of the rotary table and reflects an incident laser beam into several diffractive rays. Two PSDs were set up for detecting the positions of ±1st-order diffraction rays. A simple algebraic method is used to solve the angular indexing through an optical analysis. The experimental results showed the feasibility of the proposed test devices. 相似文献
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The indexing table was developed for angle measurements on machine tools. The measuring techniques, which have been reviewed
in this paper, are currently available in manufacturing engineering to calibrate the angle measurement. The measuring principles
of each equipment are outlined and their capabilities are also discussed. The new indexing table using 6 points kinematic
concept and employing ball and vee grooves location was designed and manufactured to calibrate angle errors of rotary tables
using a laser interferometer. The manufacturing method was evaluated to manufacture the accurate vee grooves. A special cam
was designed and manufactured to translate rotation movement into lift-up and rotation movement. A CNC machining centre and
indexing head were used to manufacture the cam. All parts of the new indexing table were manufactured with a manufacturing
tolerance according to drawings, squareness and parallelism checked to obey the 6 points kinematic concept. Also these factors
controlled the repeatability of the new indexing table. After installing the new indexing table, the performance was evaluated
using rotary table operating in both the horizontal and vertical orientations. 相似文献
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