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二次曲面凸模数控精密加工研究 总被引:1,自引:0,他引:1
滕汶 《机械制造与自动化》2005,34(6):58-59,63
对于空间立体曲面的数控加工编程来说,可以利用CAM软件完成自动编程,需完成三维实体造型的设计,才能生成刀具轨迹。但经过后置处理后,生成的加工程序往往很大。用基本的手工编程方法计算节点工作量大,且很难保证品质。作者通过研究设计的算法及加工路径生成策略,利用宏程序功能,编制出具有通用性、适用性且应用简单的宏程序。使用时只须在主程序中对相关变量赋值,调用宏程序即可完成所需参数的二次曲面凸模的加工,程序应用简单,功能强,效率高。 相似文献
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逆向工程(Reverse Engineering)是近年来CAD领域最热门的研究方向之一,是一种产品的再设计和超越过程.根据米老鼠模型,运用逆向工程的方法,使用三坐标测量技术和UGS公司Imageware逆向工程软件完成米老鼠凸模的逆向三维造型设计,运用MasterCAM软件完成该模型的三维数控加工的程序编制,经实体验证、仿真加工确保无误后,进行后处理,生成数控加工代码,在立式加工中心完成模型的复杂空间曲面数控加工,体现了三维数控加工的先进性,在工程实际中具有一定的指导和借鉴意义. 相似文献
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糜克仁 《机械工人(冷加工)》2008,(4):71-73
在进行具有复杂曲面的模具设计中,采用曲面造型的方法较实体造型既简单又快捷,而且占用计算机资源少,整个设计速度将会大大提高。模具的设计和数控加工程序的生成,必须以CAD/CAM一体化软件为工作平台。下面介绍以CAXA制造工程师2004为设计和制造平台,去完成一个玩具小汽车上凸摸的设计和数控加工程序的自动生成,并将程序传到数控铣床进行加工。 相似文献
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基于UG/NX/CAM的复杂型腔的实体造型及铣削加工 总被引:2,自引:0,他引:2
使用UG软件中的零件模块对顶盖进行了三维实体零件的创建,利用模具模块和NC加工模块对凸模、凹模进行了三维实体零件的创建、成型过程仿真和数控编程.利用UG系统的后处理功能,自动生成顶盖凸、凹模所需要的数控加工的NC代码.提高了复杂型腔的设计、制造及开发速度. 相似文献
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文中采用Pro/E进行鼠标塑件的模具设计,然后,利用Mastercam软件对鼠标凸模进行自动加工,最后,利用Mastercam后处理生成的NC程序进行数控加工。 相似文献
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设计了一种可应用于组合冲模及柔性冲压系统的快换冲模机构。通过斜楔机构的设计,模具间隙可做微量调节,工作安全可靠。模具更换快捷、方便并带自锁功能。适合中小型冲压制品的多品种、中小批量生产及系列产品的开发。 相似文献
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This investigation aims to clarify the process conditions of the V-die bending operation of steel sheet. It provides a model which predicts the correct punch load for bending and the precise final shape of products after unloading, in relation to the tensile properties of the material and the geometry of tools. The process variables are punch radius (Rp), die radius (Rd), punch width (Wp), punch speed (Vp), friction coefficient (μ), strain hardening exponent (n) and normal anisotropy (R).This investigation is carried out by performing some experiments and by finite-element simulation. Experiments determine the punch for bending for various process variables, such as punch radius, punch speed and lubrication, were carried out. As a result it was found that punch load increases as punch radius and punch speed increase or lubrication decreases.An elasto-plastic incremental finite-element computer code based on an updated Lagrangian formulation was developed to simulate the V-die bending process of sheet metal under the plane-strain condition. Isotropic and normal anisotropic material behavior was considered including nonlinear work hardening. A modified Coulomb’s friction law was introduced to treat the alternation of sliding–sticking state of friction at the contact interface. Simulation results, such as the punch load of bending and the bend angle of the bent part after unloading, are compared with experimental data; satisfactory agreement was observed. The simulation clearly demonstrates that the code to simulate V-die bending process was efficient.Simulations were made to evaluate the effects of die radius, punch width, strain hardening exponent and normal anisotropy on punch load of bending. The punch load for bending is smaller for materials with a larger strain hardening exponent. The effect of punch width on punch load is limited. The punch load decreases in the early stage and increases in the final stage of the bending process as the die radius increases. The influences of all of the process variables on the final bend angle of the bent parts of sheet after unloading were also evaluated. The effects of process variables except die radius on the bend angle after unloading are also limited. The angle of spring-back is greater for tools with larger die radius. 相似文献
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Cebeli Özek Muhammet Bal 《The International Journal of Advanced Manufacturing Technology》2009,40(11-12):1077-1083
Deep-drawing is one of the most important methods used to form sheet metal. The radius of die/blank holder and punch is important for deep-drawing dies because of an effective way to promote deep drawability sheet metal. This paper presents an attempt to determine the effect of various radiuses of die and punch on the limit drawing ratio and was investigated using DIN EN 10130–91 sheet metal. The die/blank holder profile with angles of α?=?0°, α?=?2.5°, α?=?7.5°, α?=?12.5°, α?=?15° and die/punch profile with radiuses for R?=?10, R?=?8, R?=?6, R?=?4 and R?=?0 mm were analyzed to determine the influence of punch force on the limit drawing ratio. The aim of this study is to investigate the effect of radius and angle variables on drawability in the deep-drawing process and to obtain useful data from the industrial field. The experiments show that the limit drawing ratio increased with increasing radius of punch (R), die/blank holder angle (α). 相似文献
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通过对固定圈的冲压工艺分析,设计了一种简易实用的水平冲孔模具,并介绍了下模T形镶件及其固定座的结构和顶料结构,实践证明,该模具结构简单、可靠,能保证产品品质,可大幅提高生产效率。 相似文献
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汽车覆盖件模具凸型面拉延方法 总被引:1,自引:0,他引:1
针对汽车覆盖件这种具有复杂曲面特征的零件,在传统的全型面拉延成形方法基础上提出一种新的凸型面拉延成形方法。该方法根据拉延成形过程中凸、凹模工作型面上只有凸型面接触板料的特点,通过成形仿真获得全型面拉延的成形极限图(Forming limit diagram, FLD)和凸、凹模与板料的接触区域分布。然后将板料相对凸、凹模工作型面上的起皱区域及双面接触区域所对应的单元剔除,将单面接触区域中面积较小且形态狭长的单面接触区域合并转化为双面接触区域,同时将未转化的单面接触区域外周节点拟合成曲线后导入到CAD中对凸、凹模工作型面进行分割获得所需的凸型面。算例表明该方法在保证拉延成形质量的前提下可以有效地减小凸、凹模工作型面的面积,降低拉延模具的生产成本。 相似文献