进行线切割加工的椭圆齿轮的设计与分析

进行线切割加工的椭圆齿轮的设计与分析哈尔滨工业大学尚静日本干叶工业大学尚劲松哈尔滨松江电机厂王万波关键词椭圆齿轮，线切割加工，齿轮精度椭圆齿轮流量计因其测量精度高、可靠性强，已经日益广泛地被应用于油田、石油化工、汽车工业、轻纺工业及食品加工等行业。作...     

椭圆齿轮的设计与加工

非圆形齿轮,因加工困难,用途难以扩大。但它确有很多众所周知的特点。椭圆齿轮的设计,可用分析法绘出齿轮形状、计算机法绘出齿的形状等手段来进行简化。这些是用McAuto Unigraphies CAD/CAM系统完成的。该系统具有绘图交互程序模块(Graphic Interactive Programming Module),或GRIP——用于建立操作     

基于Mastercam的椭圆齿轮的设计与加工

本文利用Mastercam软件的设计功能,用折算齿形法设计椭圆齿轮.首先绘制椭圆齿轮的节曲线,利用软件曲线等分功能对曲线按齿数进行等分,再利用软件的求切/法线及参数查询功能,作出各等分点的法线,查出其曲率半径值,最后利用软件的齿轮绘制功能计算各齿的齿形参数并绘制齿形,完成齿轮设计.用Mastercan的"wire"模块完成线切割的加工设置.     

椭圆齿轮的插补法加工

非圆齿轮是各种凸轮上带有轮齿的齿轮，形状各异，有椭圆形、三角形、方形等。非圆齿轮中最常用且加工难度最大的是椭圆齿轮。传统上针对椭圆齿轮加工可采用的方法为仿形法和范成法：仿形法加工时采用成形铣刀，在铣床或铣齿机上进行。但由于椭圆上不同点的曲率半径不同，采用仿形法加工将造成齿顶、齿根宽不同，即齿形不     

用CAD软件作图法设计椭圆齿轮

介绍用二维CAD软件CAXA的电子图板作图法设计椭圆齿轮的方法,给出了相关的数学公式及作图步骤。     

椭圆齿轮的近似拟合和数控加工

在枪圆偏心率不大的情况下,用４段圆弧代替椭圆节曲线。且以每段圆弧上的圆弧半径作为各自的节圆半径,然后运用普通数控或数控线切割机就可加工出近似的椭圆齿轮。此方法 用于其它非圆齿轮的加工。     

CAXA线切割V2软件加工小齿轮

电火花线切割加工，是近几年来迅速普及的新加工工艺及制造技术；是钳工、特别是模具钳工必须掌握的新技术。它特别适合于加工制造形状复杂的二维平面图形类工件。如齿轮模具、变压器和镇流器的硅钢片、离合器摩擦片等。下面就以加工一个模数是m=1、齿数z=10的小齿轮为例，谈谈这项新技术的应用体会。电火花线切割机加工工件的过程基本上按三个步骤，它们分别是：     

非圆齿轮滚切加工CAD/CAM一体化系统

为实现非圆齿轮滚切加工的自动化作者研制了集ＣＡＤ／ＣＡＭ于一体的非圆齿轮滚切加工系统,在ＹＫＱ３１８０型数控滚齿机上切制出椭圆、变形椭圆、扇形多种非圆齿轮。文章介绍了该系统的年组成、运动控制原理、软件设计等内容。     

High-quality cutting of polished single-crystal silicon by wire electrical discharge machining

We discussed a method for cutting smoothly polished single-crystal silicon surfaces by wire electrical discharge machining to obtain a high-quality surface. To cut out parts with smooth surfaces from the plates by rough-cutting in water while maintaining the initial smoothness of the surfaces, several kinds of masks were applied to the polished surfaces before cutting. It was found that although the application of resin masks is effective for obtaining smooth surfaces far from the cut section, the surface smoothness near the section cut in water is less than in the case of cutting in oil. Next, finish-cutting in oil was performed to remove cracks and chips generated by rough-cutting in oil. As a result, although a few chips were generated at edges of the cut section, cracks were successfully removed by finish-cutting, so that the surface quality was successfully improved by finish-cutting in oil.     

Cutting of polished single-crystal silicon by wire electrical discharge machining

Smoothly polished single-crystal silicon plates were cut by wire electrical discharge machining (WEDM) in water and in oil in order to investigate the effect of WEDM on the polished surfaces. For cutting in water, polished surfaces near cut sections have chips and cracks, and are extremely rough; the rough regions are upheaved. Examinations suggest that the upheaved region is silicon dioxide and results from oxidization of the surfaces by WEDM. Moreover, the polished surfaces far from the cut section are somewhat rough. For cutting in oil, polished surfaces near a cut section are smooth and almost flat although they have chips and cracks. These findings indicate the WEDM in oil is better than that in water for cutting polished single-crystal silicon to obtain high-quality surfaces.     

Contouring of polished single-crystal silicon plates by wire electrical discharge machining

We investigate the effect of cutting by wire electrical discharge machining (WEDM) on the shape accuracy of polished single-crystal silicon. Single-crystal silicon plates are polished, and then contoured in deionized water or in oil by WEDM. The shape accuracy of the polished surfaces is measured with an interferometer. As a result, the polished surfaces are deformed into convex shapes by WEDM cutting. The polished surfaces tend to become flat as the roughness of the cut sections decreases, and the flatness is independent of the type of cutting liquid. Cutting in oil is advantageous for maintaining the smoothness of polished surfaces. These findings confirm that, in the contouring process of polished single-crystal silicon blocks, smooth and high-accuracy surfaces are achieved by conducting rough- and finish-cutting WEDM processes in oil.     

Analysis and optimization of micro-geometry of miniature spur gears manufactured by wire electric discharge machining

This paper reports about the analysis and optimization of micro-geometry parameters (i.e. total profile deviation ‘F_a’ and accumulated pitch deviation ‘F_p’) of the wire electric discharge machined (WEDMed) fine-pitch miniature spur gears made of brass. Effects of four WEDM process parameters namely voltage, pulse-on time, pulse-off time and wire feed rate on the micro-geometry of the miniature gears were analyzed by conducting the experiments designed using Box–Behnken approach of response surface methodology (RSM). Analysis of variance study found all four input parameters significant. Larger deviations in profile and pitch were observed with higher values of the voltage and pulse-on time, and with lower values of wire feed rate and pulse-off time. Multi-performance optimization of WEDM parameters was done using the desirability analysis to minimize profile deviation and pitch deviation simultaneously. The values of F_a and F_p of the gear obtained by the confirmation experiment conducted at the optimized WEDM parameters were as 11.5 μm and 9.1 μm respectively. These values categorize the WEDMed gear having DIN quality number as 7 and 5 respectively for profile and pitch which are better than those obtained by the conventional miniature gear manufacturing processes.     

卵形齿轮CAD/CAM软件系统总体方案设计

阐述卵形齿轮CAD/CAM软件系统的基本框架结构、数据流程、设计思路、功能模块及其相关技术。     

机械加工和电火花加工的组合技术在叶轮制造中的应用

介绍了机械加工和电火花加工的组合技术在窄流道闭式叶轮制造中的应用,通过对比试验可以充分征明,这种组合加工技术是电火花加工效率低、机械加工有干涉等问题的有效解决方法。     

Three-dimensional shaping by dot-matrix electrical discharge machining

This paper deals with a new prototyping method called dot-matrix electrical discharge machining (EDM) with scanning motion. The machining process by the dot-matrix method is similar to printing motion with a dot-impact printer. This method can be applied not only to EDM but also electrochemical machining and forming. A prototype of the machining unit for the dot-matrix method has six feeding devices for thin wire electrodes. The electrodes of 300 μm in diameter are arranged with the pitches of 760 μm. To obtain a smooth surface, a planetary motion in the x-y-plane is added to the feeding of the machining unit in the z-direction, the same area is machined repeatedly, or the machining unit is moved with fine feed. By compensating for the wear of the electrode during the scanning EDM, various shapes with the accuracy of micrometers order can be obtained without a formed tool electrode.     

Influence of electrical discharge machining parameters on cutting parameters of carbon fiber-reinforced plastic

Today the use of high-strength carbon fiber-reinforced plastics (CFRP) composite as a material for many engineering applications is showing an increasing demand in the industry. These composites are replacing the traditional use of steel because they offer many advantages such as very light weight, high strength, and high stiffness associated with good corrosion-resistant properties. Unfortunately, there is little technological knowledge on the electrical discharge machining (EDM) process of high-strength composite materials, especially about the CFRP. In this work, a study has made into the possibility of using EDM process as a means of machining CFRP composite. Various cutting conditions such as peak current, pulse-on time, pulse-off time and open-circuit voltage were selected to perform electrical discharge machining. The effect of electrode rotation was also studied. Optimum cutting conditions and machine settings for EDM were chosen for machining CFRP composites.     

A parallel link end effector for scanning electrical discharge machining process

Because a parallel mechanism has a high-frequency response, multiple degrees of freedom (DOF), and high stiffness, it can be applied to an end effector for electrical discharge machining (EDM) with a scanning motion. A prototype has 3 DOF: two tilting angles around the x- and y-axes, and the movement in the z-direction. It consists of, a base plate, a stage, a constraint link, and three inchworm devices that act as links. The inchworm devices are connected with the stage and the base plate. The z-position and inclination of the stage are changed by adjusting the length of the inchworm devices. The electrode feeding is controlled by the combination of the steplike movement with the inchworm devices and continuous extension of piezos. The frequency response of the stage by the continuous extension of the piezos is up to 200 Hz. The positioning accuracy of the end effector is less than 30 μm in height and 0.04° in inclination. Some examples of EDM by the scanning motion are demonstrated.     

Experimental investigations into electrical discharge machining with a rotating disk electrode

In electrical discharge machining, when the provision of holes in the electrode is impracticable, flushing of the working gap poses a major problem. Use of a rotating disk electrode is proposed as a more productive and accurate technique than use of a conventional electrode. Material removal rate, tool wear rate, relative electrode wear, corner reproduction accuracy, and surface finish aspects of a rotary electrode are compared with those of a stationary one. The effective flushing of the working gap brought about by the rotation of the electrode remarkably improves material removal rate and machines surfaces with a better finish. Despite the prevalent high tool wear rate, the reproduction accuracy is least affected as the wear gets uniformly distributed over the entire circumference of the disk. Machining of a sharp corner is possible even with an aluminum electrode, whose relative electrode wear is greater than unity.