半自动内球面加工夹具

内球面支承座是我厂某产品液压升降系统,导轨支承座,其作用是靠内外圆球面配合消除升降不平行而影响工作中的不平稳性。支承座因装配内圆球需要     

一种偏心不规则零件的加工工艺分析

偏心不规则类零件由于形状复杂,装夹不便,生产中需要设计复杂的组合夹具,给生产加工带来了一定的难度。文中对该类型零件的结构特点、难点及加工工艺进行了分析,根据零件特点巧妙地设计了夹具,该夹具加工简单、定位方便,很好地解决了偏心不规则类零件装夹不便的问题,在保证产品质量的同时,提高了生产效率,降低了生产成本。     

机床夹具中空间尺寸的加工与测量

列举了典型的加工实例，具体说明了用二级工具和夹具上设置工艺孔的方法进行机床夹具中空间尺寸的加工与测量 。     

普通铣刀加工链轮

通常加工双圆弧齿形的链轮,都是采用成形刀具（铣刀或滚刀）,如加工链轮的数量不多、品种规格不同,而在一般的工厂要制造所需要的成形刀具,既困难成本又高,若购买或向专业厂家定制,同样会增加成本。为此,笔者介绍一种用普通铣刀加工链轮的方法。 一、加工程序及工艺尺寸的计算 用普通铣刀加工如图１所示（齿数ｚ＝１５,节距ｔ＝ １９． ０５,滚子直径 ｄ１＝ １１． ９１、齿槽 ｒ＝６．０２）的双圆弧齿形链轮（此类型链轮均可照此方法加工）,只需配备心轴、万能分度头、圆形工作台并分三步进行加工：一是钻铣出齿槽半径ｒ,它的…     

曲轴加工用活动V形架夹具

我厂加工的六拐曲轴如图1所示,工艺安排用曲轴车床加工第四主轴颈(即6和7曲臂中间的轴颈)。但在加工过程中经常发生“扎刀”现象,导致固定刀架的T形螺栓把燕尾槽拉断,严重影响生产。同时加工的第四主轴颈,圆跳动超差很大,达不到工艺要求。     

多功能电火花加工专用电极夹具

采用了各种快速高效的装夹机构设计夹具,操作方便,可缩短辅助时间,提高生产效率,节约材料,降低生产成本,在电火花机床加工中可广泛使用。     

机床夹具中空间尺寸的加工与测量

列举了典型的加工实例，具体说明了用二级工具和夹具上设置工艺孔的方法进行机床夹具中空间尺寸的加工与测量。     

支撑架深孔的断续切削加工工艺研究

支撑架是一种放置和发射导弹的装置,其内孔是由五条筋板组成的深孔结构,由于其结构的特殊性,传统的深孔加工方法难以完成,因此在充分分析其加工过程中的技术难点的基础上,提出了设计专用夹具、改进找正方法、改进深孔镗刀三项解决措施,最终确定了合理的加工工艺方案,成功解决了深孔断续切削不稳定问题,仅保证了内孔的加工精度和表面质量,...     

唇砖加工夹具的设计

1 唇砖的简介及背景唇砖是用在浮法玻璃窑出口处的一块异形耐火砖。形状见附图1.它是玻璃液流出的必然通道,其表面质量的好坏直接影响到平板玻璃表面质量的高低。唇砖的材质为α—BAl_2O_3,比重约2.7g/cm~3,对金刚石的     

磨加工断续表面尺寸处理技术研究

针对在磨削加工的过程中,测量尺寸因为断续表面的存在发生突变,可能会导致磨床停机进而影响磨加工的工件尺寸精度这一问题,提出了智能断续表面尺寸处理系统,该系统对断续表面的情况加以处理,忽略测量装置测量断续表面的数据,筛选出断续表面发生突变的尺寸,并通过支持向量机预测模型将相应数据进行替换,大幅度提高了产品加工精度和质量.首...     

Quality design of fixture planning for sheet metal assembly

Fixturing plays an important role in enhancing weld quality of the sheet metal assembly process. However, traditional experience-based fixturing schemes and purely optimal fixturing schemes are often sensitive to location fluctuation of the designed locators. In this paper a mathematical representation of deterministic locating and total fixturing for a flexible workpiece is developed first, then a virtual beam model is proposed to evaluate the degree of flexibility of the locating points. A quality design model of fixture planning for sheet metal assembly with resistance spot welding is then developed; both the performance expectation and the variance are considered in the formulation of the objective function; a prescribed factor is used to weight the two objectives. The finite element model based on ANSYS software is set up with a spot weld feature employed and genetic algorithm is used in the optimization process. A simple example and an industrial case illustrate the feasibility of the developed model. This work provides a basis for improving the quality of sheet metal assembly in the design phase.     

Sizing of spray particles using image processing technique

The image processing technique is simple and, in principle, can handle particles with various shapes since it is based on direct visualization. Moreover, a wide measurement area can be covered with appropriate optical arrangement. In the present paper, various techniques of image processing for sizing and counting particles are reviewed and recent developments are introduced. Two major subjects are discussed in detail: identification of particles (i.e., boundary detection and pattern recognition) and determination of in-focus criteria. Finally, an overall procedure for image processing of spray particles is suggested.     

差速器壳十字轴孔加工方法及夹具设计

分析了某一汽车差速器壳十字轴孔的加工方法,确定了加工方案并设计了专用夹具。该夹具结构简单,定位可靠,能够保证工件的加工精度,提高生产效率,取得了良好的应用效果。     

装夹方案与加工顺序综合优化方法研究

装夹方案和加工顺序对零件加工精度具有重要影响,尤其是对薄壁件的加工.不同的装夹方案和加工顺序都会造成不同的工件变形,甚至使工件报废.因此,基于装夹方案分析的加工顺序优化对薄壁件的加工精度控制有着现实的意义.建立了一个工件-夹具-刀具系统模型,可以分析装夹方案对工件变形的影响,并能以装夹方案为基础分析最优加工顺序.以一个典型薄壁件为例,进行了装夹方案和加工顺序优化分析,得出了装夹方案与加工顺序优化一般性的结论.     

机床夹具定位误差的计算机辅助数据处理

简要介绍了定位误差的研究现状,分析了定位误差的产生机理及其计算方法.以典型单基面定位方案和典型组合面定位方案构建机床夹具定位方案资源库,结合系统开发流程图,通过VB6.0工具开发定位误差计算机辅助数据处理的误差校验系统,并以实例验证了系统良好的使用性能和操作界面,进一步完善CAFD质量评价体系.     

Lubricant test methods for sheet metal forming

Sheet metal forming of tribologically difficult materials such as stainless steel, Al-alloys and Ti-alloys or forming in tribologically difficult operations like ironing, punching or deep drawing of thick plate requires often use of environmentally hazardous lubricants such as chlorinated paraffin oils in order to avoid galling. The present paper describes a systematic research in the development of new, environmentally harmless lubricants focusing on the lubricant testing aspects. A system of laboratory tests has been developed to study the lubricant performance under the very varied conditions appearing in different sheet forming operations such as stretch forming, deep drawing, ironing and punching. The laboratory tests have been especially designed to model the conditions in industrial production. Application of the tests for evaluating new lubricants before introducing them in production has proven successful and has in a number of examples assisted the substitution of environmentally hazardous lubricants by more friendly ones in industrial production.     

薄板类零件加工变形的解决方法

薄板类零件在现代产品中的应用非常广泛,针对使用传统的加工工艺、加工设备加工薄板类零件,易造成零件变形的情况。先从薄板类零件变形的类型和原因着手分析,进而从加工工艺、加工技术条件、加工刀具、装夹方法几个方面研究薄板类零件加工变形的解决方法,从而达到减小加工变形的目的。     

装配加工法在保证夹具制造精度中的应用

装配加工法在夹具制造工艺方面上明显有别于装配调整法,其基本原理是:将夹具作为一个整体对待,对有位置精度要求的导向结构或定位结构,安排在夹具组装后进行加工,以最大限度地减少各元件之间的累积误差,提高夹具制造精度。文章通过典型实例论述了装配加工法在夹具制造中的应用过程,并总结了应用这种工艺方法制造的夹具在图样设计方面的主要特点。大量的实际应用表明,装配加工法是保证夹具制造精度的最简便有效的工艺方法。     

A／D、D／A接口电路系统设计

文中论述了模数、数模转换接口系统设计的要求、原则和根据系统要求选择模数、数模芯片,并重点阐述了在系统线路设计时必须考虑的一些问题。     

Simultaneous optimization of fixture and joint positions for non-rigid sheet metal assembly

This paper presents an optimization methodology for non-rigid sheet metal assembly variation by considering part variation, fixture variation, fixture layout, and joint positions, as well as the assembly spring back. The proposed algorithm integrates the finite element analysis (FEA) with a powerful global optimization algorithm, called the mode-pursuing sampling (MPS) method to simultaneously search for the optimal fixture and joint positions in order to minimize the assembly variation. An example application study is presented to demonstrate the optimization procedure and its effectiveness.