轴承套圈双主轴车削中心数控系统的设计

轴承在市场上有着广泛的应用,为了提高生产效率,研发轴承套圈双主轴车削中心数控系统符合当前市场需求。根据多年工作经验,通过参阅大量文献,研发了轴承套圈双主轴车削中心数控系统,设计了机械本体、系统结构及机床面板等,为提高生产效率,保证生产质量提供了技术支持,得出了有益结论。     

轮毂轴承套圈闭式锻造成形数值模拟分析

根据轮毂轴承套圈的产品特点,设计了闭武精锻成形工艺方案.并通过Deform-3D对成形过程进行了数值模拟,分析了闭式锻造过程中金属的变形规律.数值模拟结果为轴承套圈闭式锻造工艺与模具设计提供了有效参考.     

一种轴承套圈漏工序在线自动检测设备的研制

研制了一种检测并分选出轴承加工过程中漏工序次品的自动检测设备。在分析检测设备所需功能的基础上,设计了系统的机械结构,描述了系统的工作原理及其基于PLC控制单元的自动控制方案。该系统具备自动上料、定位、检测、剔除次品等功能,实现了轴承漏工序次品的全自动化在线检测。生产实践证明,该设备有效提高了轴承套圈漏工序检测的可靠性及效率。     

Optical Methods for Dimensional Metrology in Production Engineering

Metrology in production engineering must be fast, accurate, robust and automated, and ideally integrated into the production line. In many respects, optical methods seem to fulfil these requirements. Although optical methods have a long tradition in dimensional metrology, the rapid progress in the development of optoelectronic components and availability of increased computational power makes many new technical approaches possible. This paper provides a technical overview of the optical methods available for dimensional metrology. Methods for the measurement of length, angle, surface form and spatial co-ordinates are described. The paper summarises both the metrological characteristics and the technical limitations of the methods. Furthermore, it presents some new and promising approaches that, in the future, may play an important role in dimensional metrology for production.     

TOFD检测中变形波信号和非相关信号的识别

TOFD检测技术的难点之一是图谱识别和判读。针对TOFD检测图谱中的变形波信号进行了时差计算,并结合检测实例进行了展示和分析,以排除变形波和其它非相关信号的影响,从而正确识别和测定缺陷,避免误判。     

含Nb钢表面横裂纹成因及控制措施

通过对含Nb钢种Q345E的钢坯、钢板表面横裂纹部位取样进行金相电镜分析,确定该类钢种钢坯表面横裂纹产生于连铸结晶器内,针对性地对连铸结晶器内可能造成表面横裂纹相关因素的排查分析后,采取优化保护渣、减小结晶器冷却水量、提高结晶器振频等措施,使该类钢种表面横裂纹发生率由1.0%降至0.3%以下,成效显著。     

细长件熔模铸造热裂及变形缺陷问题的解决

介绍了细长件熔模铸造热裂及变形问题的产生及解决方法,并对缺陷的原因及解决方法进行了分析。     

Proposal of Service CAD System - A Tool for Service Engineering -

To solve current industrial problems, manufacturers need to supply service rather than materialized products to consumers. We propose a novel engineering paradigm to deal with services, service engineering. We define services as a state change. A service model consists of three sub-models: scope model, view model and flow model. A computer-aided design tool, called Service Explorer, is developed to represent a network of the parameters and determines the influence weight one another. As the result, we verify the usefulness of the design tool.     

Distortion minimization of disks for gear manufacture

In order to minimize shape deviations in hardening of gear wheels, all production steps in the manufacture of disks made of SAE 5120 prior to heat-treatment were analyzed by means of design of experiments (DoE). The influence of hardenability, pre-heat treatment, forging temperature, and feed rate and partition of material removal in cutting on the distortion of disks were investigated. Standard case hardening of the disks led to a characteristic shape change called “dishing”. The statistical analysis of the test results has proven that dishing of disks is mainly affected by the partition of the material removal in the considered case. In additional experiments dishing could be eliminated (on average) by an optimized partition of the material removal. However, results from experiments with spray-formed disks and with disks using a different forming strategy imply that the material flow combined with material inhomogeneities are the physical causes for dishing rather than the partition of material removal.     

20CrMnTi中厚板热处理淬火及变形研究

通过对 2 0 Cr Mn Ti中厚板淬火、淬火变形的研究 ,制订了新的工艺方案 ,解决了该类产品生产中的一些常见的热处理淬火硬度低及变形大的问题     

提高主轴轴承精度和刚度的措施

从提高主轴轴承精度和刚度的角度浅淡提高主轴回转精度的几种措施。     

铁路轴承淬火压力机床液压油缸设计计算

通过淬火压力机床的油缸设计,解决了货车铁路轴承淬火工艺难以控制的问题,保证了淬火精度,提高了工件在轴向了动定心的精度,提高了产品的使用寿命.     

表面工程与再制造工程的进展

阐述了表面工程的定义、特点以及在生产实践中的应用,指出了表面工程在21世纪的发展方向一纳米表面工程和复合表面工程。介绍了再制造工程的概念、组成与作用,并指出再制造工程在我国具有广阔的应用前景。     

铁路轴承淬火压力机床模具设计

货车铁路轴承淬火工艺难以控制，采用模具在淬火压力机床上对轴承进行约束，限制了其变形量，保证了淬火精度，提高了产品使用寿命。     

Bearing load analysis and control of a motorized high speed spindle

Angular contact ball bearings are the most popular bearing type used in the high speed spindle for machining centers. Because the bearing load is increased rapidly with the raised spindle speed due to the centrifugal force and temperature raise, proper initial preload and especially operating-induced load control of the angular ball bearing is important to the rigidity, accuracy and life of the spindle. The bearing layout, preload mechanism an on-line load bearing control are discussed in this paper. The management of the centrifugal force and thermally-induced bearing loads is especially emphasized. An active bearing load monitoring and control mechanism that consists of an integrated strain-gage load cells and piezoelectric actuators has been developed and tested. This active control and monitoring mechanism on-line adjusts the bearing load according the cutting conditions. Experiments were conducted to identify the proper initial bearing preload range. Optimal preload for the lowest bearing temperature raise existed for a specified spindle speed. The optimum preload, however, should be raised when the operational speed is increased.     

C41-400型空气锤传动系统改造中的支承设计

针对C41—400型空气锤由于传动系统故障而导致电动机损坏的问题,通常的改进方案是增加一级V带传动,但由于对改造中的支承设计不合理而失败的情况也时有发生。本文总结了成功的改造经验,指出改造中的关键问题是带轮一齿轮轴的支承设计。将前后两支承设计为一个整体轴承座,充分利用原电动机安装底座的有效长度,最大限度地缩短了轴的悬伸量,提高了轴承座与底座的螺纹联接强度。     

大型轧辊轴承座拆装机液压系统设计

介绍了一套大型轧辊轴承座拆装机的液压系统,分析了系统设计过程中的技术难点,确定了系统的主要性能参数.该液压系统已在轧钢生产、有色金属加工的大型企业投入使用.在实际应用中,该系统运行平稳、可靠,实现了轧辊轴承座的高效、可靠、安全的拆卸和安装.     

基于微磁测量与磁化分布重构的轴承磨损评估

文章提出了超导量子干涉器件（SQUID）对轴承润滑油中铁屑产生的微磁场进行监测,进而评估轴承磨损程度的方法,并进行了可行性验证试验。为基于检测信号确定润滑油中的铁屑含量,提出了对油液管道内部磁化分部进行重构的方法,通过数值模拟研究了其有效性。结果表明,SQUID可以检测铁粉颗粒所产生的微小磁场,且信号幅度与含量有明确对应关系;反演程序可有效重构管道内部的铁磁成分分布磁化,即使信号中有20％白噪声,重构结果也在可信范围。     

出口合金钢工作辊轴承座的加工技术

介绍材质为ZG34CrNiMo的工作辊轴承座的加工难点及在工艺和管理上采取的措施.     

转向架支撑座模锻工艺

针对转向架支撑座的模锻工艺难点,分析和比较两种不同的模锻工艺方案和模具设计,探索提高锻件质量的最佳工艺.