共查询到19条相似文献,搜索用时 156 毫秒
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郑华林 《组合机床与自动化加工技术》1990,(3):32-37
文章介绍了SJCAPP系统中自动求解工序尺寸及公差的计算方法和原理。系统采用图解跟踪法的尺寸链原理搜寻工艺尺寸链,利用整体联系原则校核与调整公差及余量,达到所确定的工序尺寸经济合理。图6幅,表2个,参考文献2种。 相似文献
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图表跟踪法是利用尺寸链原理,求解复杂零件工序尺寸与公差的行之有效的方法。VB是面向对象的程序语言,用它开发的程序界面友好,便于操作,用它将图表跟踪法的求解步骤一一表达出来,就能生成零件的机加工工艺。 相似文献
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介绍了日产5000t干法水泥窑承托部分的托轮的技术要求和侧压冒口法铸造工艺.托轮材质为ZG42CrMo,轮廓尺寸φ2110mm×1050mm,毛重22780kg.在分析了托轮铸造结构工艺性的基础上,比较了顶压冒口法和侧压冒口法两种铸造工艺的优缺点,确定采用侧压冒口法铸造工艺.通过合理选定铸造工艺参数,如造型方法、铸造收缩率、机械加工余量、冒口的形状尺寸和数量、内冷铁的截面尺寸和质量、浇注系统各组元截面积等,严格控制生产工序操作,生产出了合格铸件. 相似文献
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讨论了数控车床前、后顶尖中心轴线产生不等高度的原因,提出采用修配法解装配尺寸链,通过调整尺寸链中的修配环来保证装配需要的精度。通过对修配法求解装配尺寸链在调整数控车床前后顶尖的模型分析、编程和事例验证显示,以及修配法解装配尺寸链适合调整机床前后顶尖不等高度的计算,并将计算程序化,提高了数控机床的装配或维修效率。 相似文献
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杨长春管清富逄增苗 《中国铸造装备与技术》2021,(1):25-30
首先介绍了数字化、智能工厂、智能制造的概念,并结合V法铸造的工艺原理,以两化融合为基础,对V法各工序、各环节如何实现数字化、网络化、智能化,显示、操作的设计,成功对接MES、ERP等管理系统,规划、建造一流的智能制造企业.重点突出智能制造的核心是工艺装备与人工智能的融合,实现工艺装备的智能化,是制造业转型发展的方向. 相似文献
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介绍了V法铸造工艺的主要设备与其技术特性.分别介绍了各设备在造型、砂处理各工序环节的基本应用状态和相关的技术特性.通过探讨V法铸造生产的工艺及技术特性,以拓展V法铸造工艺装备与生产的发展前景. 相似文献
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文章基于尺寸链原理,借助一个机械加工实例,详细分析了工艺尺寸式方程的建立、查找及解算过程;并在此基础上引入基本尺寸矩阵方程和公差矩阵方程,采用Matlab语言编写计算机程序.系统完整地解决了机械加工过程中涉及到的所有尺寸及公差的计算机解算问题,明显地提高了尺寸链的解算速度和质量. 相似文献
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This paper describes an interactive computer program for die layout design which is part of a complete CAD/CAM package for forging hammer dies. Given hammer weight, blow energy, bar stock size, flash dimensions, finishing and preform die geometries, the program can be used to choose a die block of suitable size and design the disposition of cavities on it. The size of sprues and gates and the dovetail design are also dealt with by the program. The program's output, ideally post-processed for controlling NC die sinking machines, can be used for the manufacture of complete die blocks for hammers. 相似文献
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The purpose of dimensioning and tolerancing for process planning is to determine the dimensions and tolerances that are to be produced at each stage in the manufacture of a component in order that the design dimensions and tolerances specified on the engineering drawing of the component are satisfied. Three proposed objective functions for cost minimization are developed in this paper according to various situations. When cost information is available average cost per acceptable unit produced in minimized, otherwise ratio of number of components to be machined to output is minimized. If residual tolerances exist sum of manufactured tolerances are maximized by assigning weights according to their process capabilities. Combining these objective functions a computerized optimization program has been developed which determines the optimum set of dimensions and tolerances which satisfies the specified design dimensions and tolerances and the permissible machining allowances, with the cost of producing all dimensions to the respective tolerances to be minimal.
This system takes into account machining cost, scrap and where in the production process it occurs, manufactured dimensions and their distributions, allocated tolerances and process capabilities. 相似文献
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针对极值法求解尺寸链过于保守、统计法求解尺寸链需知晓各环的概率分布等问题,研究了用区间分析方法来计算复杂平面尺寸链方程组的原理和方法。首先,将尺寸链中的各环尺寸及其偏差以区间数的形式来表示,构建区间参数方程组;其次,利用Krawczyk算子及INTLAB工具箱编写了求解区间参数方程组的应用程序,并引入区间截断法;最后,对机枪机心结构尺寸链实例分别进行了区间分析计算和CE/TOL6σ软件计算,并进行对比和分析研究。研究结果表明采用区间分析求解平面尺寸链的计算结果优于极值法,并能弥补RSS统计法的固有缺陷。 相似文献
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《Acta Materialia》1999,47(3):915-926
The quantification of sintered microstructures is an inherent part of powder metallurgy. Often a means to explain the effects of process variations with respect to sintered properties is needed. Quantification of grain size in the microstructure is an essential part of that effort. If satisfactory models exist, then the effort might be simple. Along those lines, three-dimensional grain size distributions can be obtained from two-dimensional grain section distributions by using a new forward transformation method. The technique is applied to sintered microstructures to verify the procedure, but the method is not limited to a particular material. A computer simulation program is developed. The initial three-dimensional grain size distributions are obtained from a backward method. The method can handle grains with different shapes, dihedral angles, and contact numbers. Both the Weibull and normal distribution functions are used to process the data. The results show that dihedral angle and contact number greatly affect the grain size distribution causing the three-dimensional grain size distribution to become narrower at high solid volume fractions. 相似文献