基于Top-Down的主轴箱传动系统设计

主轴箱是组合机床中的专用部件,其传动系统的设计是决定组合机床设计效率的关键。利用Pro/E建立主轴箱各传动零件的三维参数化模型,并对主轴箱传动系统进行Top-Down的参数化布局设计,实现主轴箱传动系统的自动装配,从而达到快速设计主轴箱传动系统、缩短产品设计周期的目的。     

数控机床中主轴变速箱的设计

社会注意市场经济的发展为我国工业生产创造了条件,在现代一体化生产模式中运用了很多先进的设备.对于数控机床而言,主轴箱是其最为核心的组织结构,整个主轴箱影响着数控机床的变速情况.大部分制造企业在实行技术改造时把重点放在了主轴箱变速器上,这是调整机床运行速度的重点.在设计过程中必须要对主轴箱的每个部件加以控制,这样才能确保数控机床主轴变速性能的良好.本文从数据机床主轴箱的主轴、Z轴、滚丝珠杆等方面进行设计,以对主轴箱性能加以改进.     

组合机床基本知识讲座 第四讲 组合机床的主要专用部件——主轴箱

组合机床主轴箱主要有下述几个类型:1.钻镗类主轴箱,加工工件时刀具用导向套导向。2.具有刚性主轴的主轴箱,加工工件时刀具不用导向。要求刚性好,主轴为专用结构。3.铣削主轴箱,结构亦为专用的。4.主轴可调主轴箱,用于多品种加工。组合机床主轴箱是需要专门设计的。在组合机床设计中,大量遇到的是要求在同一个主轴箱上布置各类主轴同时完成钻孔、扩孔、铰孔、镗孔以及攻丝工序。完成这类工序的主轴箱,通常称为标准主轴箱,主要有钻镗类主     

磨床砂轮架设计与制造研究

就磨床的砂轮架在设计、制造、装配诸方面进行了比较详细、系统的研究与分析,揭示了磨床砂轮架中各零件之间的相互内在联系,指出了砂轮架设计、制造中如何对各种零件性能相互进行配合,从而满足不同性能的要求。     

组合机床主轴箱辅助设计系统

基于组合机床主轴箱设计过程中所用到的计算和验证公式建立知识库,利用计算机编程、数据库等软件开发了主轴箱辅助设计系统,使组合机床主轴箱设计过程可视化、简单化、模块化。应用这一系统,设计人员可以快速方便地完成主轴箱的传动系统设计、校核检查、箱体零件设计及绘制等工作。     

数控车床主轴箱装配工艺的改进

我公司生产的数控车床,主轴箱部件主要由主轴、前后轴承和箱体三部分组成（见图1）。因为主轴箱的装配效果对整个机床性能的影响很大,因此装配主轴箱部件的过程中对轴承以及主轴的装配质量要求很高。     

C630车床主轴箱静力分析

应用UG软件对主轴箱建模,以C630车床主轴箱为研究对象,应用有限元分析软件ANSYS Workbench建立主轴箱模型,并对其进行静力分析。通过对有限元计算结果的分析,得到机床主轴箱模型结构的应力和应变大小,从而可以分析结构的刚度和强度能否满足最初的设计要求。这些分析结果为机床的设计提供了依据,对提高机床主轴箱的设计水平具有重要意义。实践表明,对主轴箱进行有限元分析,能够有效地提高主轴箱设计质量。     

数控车床主轴箱的传动设计

为了提高车床的综合性能,本文针对车床的主轴箱组合设计的特点,通过设置主轴箱的工件最大回转值、正转最高转速等已知条件,采用集中式传动,对其主传动方案和传动系统进行设计。根据《实用机床设计手册》查表获得相关参数值,并绘制出主轴箱的主传动系统图来保证车床主轴的精度,从而完成主轴箱的传动设计。     

基于动态精度的直驱型高速机床主轴箱静动态特性分析

分析了直线电机驱动型高速立式加工中心Z向进给系统的主轴箱受力情况,根据主轴箱部件力流特征设计了新结构,并将新设计的主轴箱与原有结构进行静力学和模态分析对比,以改善结构静动态特性。为了防止不良主轴激振频率影响主轴箱动态稳定性能,保证高速切削加工时精密零件、模具的表面精度,分析了主轴箱的谐响应性能,以找出激振频率下主轴箱的动态精度特征。分析结果表明,在曲面精加工时,采用12800rpm或18000rpm的主轴转速,激振力对切削加工动态精度影响最小,可以得到最佳切削加工表面精度。     

转塔式组合机床主轴箱设计

首先介绍了用于080左、右曲轴箱体加工的转塔式组合机床主轴箱设计任务的由来,并对转塔式组合机床结构进行了简要说明.重点探讨了转塔式组合机床主轴箱设计的要领,明确了设计工作的程序.对主轴箱设计的要点如主轴、前面板、传动箱体进行了详细的分析和研究,详细地描述了它们的结构特点和制造工艺.最后总结了主轴箱设计工作中的创新性.     

Thermal error reduction based on thermodynamics structure optimization method for an ultra-precision machine tool

Thermal error is one of the main errors in ultra-precision machine tools. This paper presents a thermodynamics-based structure optimization method to reduce the thermal displacements of machine tools during operation. The method makes use of the thermal–structure coupled model to analyze the thermal behavior considering the thermal contact resistance and the temperature rise of the oil film in hydrostatic spindle. The structure of the motor link, spindle, and headstock of grinder are optimized by setting appropriate gaps in the contact region of two neighboring parts to change the heat transfer distribution and minimize the thermal displacement of the spindle center position. The proposed method is validated by an equivalent thermal conductivity-based simulation method and experiment on an ultra-precision grinding machine tool. Experimental results show that the proposed method can provide an important instruction on how to reduce the thermal error for the design of the precision machine tools, especially for those with key parts placed near the heat sources.     

A manufacturing model of helical groove on rotary burr and a universal post processing method

A systematic machining theory and precision method to determine cutter location in a grinding system is presented for rotary burr. First, the helical cutting edge on various kinds of revolving surfaces is built. Then, based on the geometry model of the helical cutting edge, the smooth spiral rake surface with constant normal rake angle and flank surface can been formed during the one-pass grinding process by this method. No interference between the grinding wheel and workpiece happens by the wheel special rotation. The method has the characteristic of detaching the grinding wheel path solution from specified machining conditions. The grinding wheel path is suitable for different NC machine tools through post processing. Meanwhile, a mechanism kinematic model of the NC machine tool is built, and a generalized algorithm for post-processing of multi-axis NC machine tools is presented. This model is applied to arbitrary configuration of NC machine tool, and the motion value for each axis will be generated by the inputting structure and motion parameters of the machine tool. The model, together with the machining method mentioned in this paper, make the calculation and generation of the grinding wheel path simpler and universal. At last, the validity of the method given in the paper is identified by an example of grinding.     

CA6140车床主轴箱的仿真研究

高职院学生在学习机床内部构造和机床维护时,无法直接观察机床内部的运转状况。用UG软件模拟仿真了CA6140机床的主轴箱,并且通过按照主轴箱的传动系统图设定齿轮的啮合情况,做出在一定转速下齿轮传动仿真视频。通过这套模拟软件,不仅可以分析CA6140机床主轴箱内各个零件的结构,还可以分析这个部件的装配工艺,以及机床运转时内部的传动状况。使学生更直观的学习机床内部构造和机床维护,提高学习效果。     

大型平面磨床主轴轴承的总体设计

在相关理论研究的基础上，将表面节流结构的动静压轴承应用于M3724大型平面磨床磨头组件的整造中，完成了磨头组件及相应液压站的技术设计。利用动静压轴承技术用于大型磨床的改造尝试，也可为其他大型设备的改造提供参考。     

Experimental study of wheel wear in electrolytic in-process dressing and grinding

Profile accuracy of components ground with ultra-precision machine tools is primarily dependent on wheel wear. Quantitative analysis of wheel wear is therefore an important aspect for precision grinding with electrolytic in-process dressing (ELID). In this paper, wheel wear is measured from ELID grinding experiments with different dressing and machining parameters. The grinding forces and dressing current characteristics of the experiments are also compared. Based on the results, a benchmark function is defined for wheel wear rate. A relation for identifying insufficient dressing from sufficient dressing for particular machining conditions is also identified. It is found that insufficient dressing produces pitting and/or arcing on the wheel surface, and wheel wear can be linearly correlated to ELID grinding conditions when the wheels are sufficiently dressed.     

车磨抛合一的数控加工

在数控车床上,应用SN弹性砂轮,可将车磨抛工序集于一身,扩展了数控车床的加工范围,尤其适合重要零件的加工和修复.在数控改造中,采用特殊的结构,将一般数控机床单一的单位控制精度改为多单位控制精度,并针对实际加工中需要的不同抛磨次数,采取特殊的程序结构予以处理,而且还实现了对SN弹性砂轮弹压量和磨损的瞬时自动补偿。     

无心磨床加工圆锥滚子凸度的方法

对无心磨床的附件进行必要的改进,使其砂轮修整器、工件托板和螺旋导轮均符合磨削圆锥滚子素线凸度的需要。     

数控轧辊磨床工件头架的研究与应用

重型数控轧辊磨床工件头架结构的研究与制造是通过精确的分析论证,结合现代最先进的加工工艺方法,通过严格的质量控制,确保了头架的可靠性及各项技术指标均到达使用要求。     

A precision grinding method for screw rotors using CBN grinding wheel

Aiming at the high precision machining of screw rotors, a new grinding method for screw rotors using cubic boron nitride (CBN) grinding wheel is presented in this paper. Small electroplated CBN grinding wheel is firstly used to grind screw rotors. The mathematical model for the axial profiles of CBN grinding wheel is developed based on gear engagement theory. Taking the backlash of screw rotors and the coating thickness of CBN layer into consideration, the modification of the base body of the wheel shape is introduced into the design of the CBN grinding wheel. Wire cut electrical discharge machining low speed (WEDM-LS) was used to machine the base body of the CBN grinding wheel. The formed turning tools of the base body of CBN grinding wheel using WEDM-LS and the wheel shapes of CBN grinding wheel using the formed turning tool were performed. The CBN grinding wheels for the screw rotors were made to verify the validity and effectiveness of the presented method. The electroplated CBN grinding wheels were used to machine the screw rotors, and the machining experiments were performed. The data obtained in the experiments reach the fifth class of Chinese Standard GB10095-88.     

数控锥面砂轮磨齿机磨削椭圆齿轮

根据非圆齿轮的啮合原理,对数控锥面砂轮磨齿机磨削椭圆齿轮进行研究,提出两种不同的机床结构运动形式,即砂轮移动型和砂轮固定型,并建立椭圆齿轮磨齿加工运动关系数学模型。由于椭圆齿轮的各个轮齿不同,其所需的展成行程也不相等,通过对展成和分度运动的详细分析,推导磨削每个齿槽的展成行程通用计算公式。最后给出加工实例,对两种加工方式中每个齿槽的基本加工参数进行了计算,并进行展成过程动态仿真。研究结果表明,利用数控锥面砂轮磨齿机磨削椭圆齿轮是完全可行的。