一种压力机分体式离合器制动器及气动控制系统

简述了大型机械压力机分体式离合器、制动器的结构原理,以及其气动控制系统的具体设计思路和原理。分析了离合器、制动器产生干涉的原因,并提出了解决办法,对具体的调试过程也做了简单描述。     

XJC-2型离合器制动器协调性监测仪

一、概述离合器—制动器是机械压力机的重要部件之一。压力机的运行可靠性在很大程度上取决于离合器和制动器。离合器和制动器在工作过程中,如果接合和脱开的次序不协调,即在一段时间内二者同时处于接合状态,则产生互相干涉现象。轻则使离合器发热严重,摩擦片磨损加快,同时增加能耗,重则能造成严重设备事故。不仅产生直接的经济损失,还增加了停机维修时间。目前国内没有专用的仪器和简便而精确的     

离合器—制动器协调性监测仪的工业性试验

由第一重机厂重机研究所研制的离合器制动器协调性监测仪于一九八四年十一月通过技术鉴定。本文即介绍该监测仪在二汽车箱厂进行工业性试验的情况。经两次工业性试验证明:该监测仪运行可靠、操作方便、读数精确,能精确的测定机械压力机离舍器制动器的协调性和干涉时间。使用该监测仪对于解决离合器制动器由于干涉而造成的发热、磨损问题,具有现实意义。     

一种压力机制动器离合器的连锁回路技术

介绍一种制动器离合器连锁回路装置,实验结果证明本技术装置可避免制动器与离合器之间相互干涉,消除安全隐患,增强压力机工作的安全性。     

湿式离合制动器在热模锻压力机上的应用现状分析

热模锻压力机上广泛应用的湿式离合制动器按离合器与制动器的布置形式可以分为分体式离合制动器和组合式离合制动器。湿式离合制动器以液压油作为工作介质,整个离合器、摩擦器腔内充满了液压油,主动轴和被动轴间的扭矩传递通过油膜间的抗剪力实现。本文着重介绍当前热模锻压力机上应用的湿式离合制动器的结构类型及相关产品,并对其关键零部件摩擦片的研究现状进行了归纳分析。     

摩擦离合器制动器设计参数选择的商榷

摩擦离合器制动器是曲柄压力机的重要部件,它的工作好坏直接影响压力机的性能。我国生产的大型曲柄压力机,摩擦离合器制动器大部分存在发热严重,摩擦元件磨损大、寿命低以及制动不够灵敏等问题。这些问题除了与离合器的结构设计、摩擦元件的好坏、以及离合器制动器的控制和联锁有关以外,还和离合器制动器的设计参数选择有关。本文仅就最后     

软结合离合器制动器气控装置

目前,我厂生产的机械压力机离合器制动器气控装置主要有以下几种形式.1.正联锁电磁阀与单向节流阀装置(图1)该装置离合器制动器的进出气管径相同,靠调整节流阀的节流孔及正联锁阀先后动作之差,实现进气时制动器先取开,离合器后     

湿式离合器/制动器及其在机械压力机中的应用

根据多年在汽车制造业中规划，使用和维修机械压力机的经验，介绍了湿式离合器／制动器在机械压力机中的应用现状及其与气动离合器／制动器在使用性能方面的比较。     

分体式气阀连锁离合器与制动器分离不清的因素分析

在介绍机械压力机离合器与制动器工作原理及动作协调性的基础上,分析了造成不协调(即离合器与制动器分离不清)的因素和解决方法.     

400kN无离合器—制动器压力机设计

阐述了一种新型结构的压力机，该压力机是以六连杆机构及四连杆机构的变换代替传统的离合器—制动器结构，从而消除了由制动引起的能量消耗和发热，降低了由离合器—制动器引起的冲击噪声     

Effect of eccentricity of twist drill and candle stick drill on delamination in drilling composite materials

Drilling is the most frequently employed operation of secondary machining for fiber-reinforced materials owing to the need for structure joining. Delamination is one of the serious concerns during drilling. Practical experience shows that an eccentric twist drill or an eccentric candle stick drill can degrade the quality of the fiber reinforced material. Comprehensive delamination models for the delamination induced by an eccentric twist drill and an eccentric candle stick drill in the drilling of composite materials have been constructed in the present study. For an eccentric twist drill and an eccentric candle stick drill, the critical thrust force that will produce delamination decreases with increasing point eccentricity ξ. The results agree with industrial experience. The need for control of drill eccentricity during drill regrinding has been proved analytically by the proposed models.     

汽车内分型模具设计分析

结合某汽车后左右饰条分析了内分型模结构,斜顶块与镶件的运用解决了分型线的问题,批量生产后证明模具结构可靠,动作平稳,脱模顺畅,产品外观得到有效保证,达到了最初设计的效果。     

外曲翻边翌边展开周向尺寸的计算

基于对翻边时应力应变状态的分析，提出了一种对毛坯进行修正从而得到较理想尺寸精度外曲翻边零件的方法。     

薄壁多节锥台壳体爆炸胀球精度分析

爆炸胀球技术是一种成形薄壁球壳的先进技术。通过对薄壁多节锥台壳体爆炸胀球过程的数值分析与实验结果对比，发现影响成球精度的结构因素，并就此提出提高薄壁多节锥台壳体爆炸胀球精度的相关措施，为薄壁球面零件的成形开辟了有效途径。     

Impedance spectroscopy of the process of hard anodizing of aluminum alloys

This article discusses an in situ method for the diagnostics of the hard anodizing process based on impedance spectroscopy allowing the coating thickness during treatment to be estimated. The experimental results are given for the hard anodizing of aluminum alloys used in the aircraft industry. Parameters of an equivalent circuit of the electrolyzer were specified and the regularities of their evolution were established. A diagnostic model was proposed and its efficiency was demonstrated for an industrial serial production.     

一种高效型金刚石锯片开刃机设计

本文在对目前整体烧结金刚石锯片侧刃开刃过程进行实验研究的基础上，指出合适的开刃形式与合理的开刃参数对开刃过程有显著影响。进而设计出快速的锯片装卸方案，并针对影响开刃工序成本与效率的其他重要环节进行了研究，提出了解决方案。实验结果表明，改进型开刀机大幅度提高了工作效率，降低了加工成本。与吃入式开刃形式相比，抹式开刃是一种更为合理的开刃形式。     

MsS导波技术在海洋钻井平台输油管道检测中的应用

海洋钻井平台工艺管道工况复杂,管道常规检测方法难以满足检测要求,迫切需要一种有效的在线检测技术。鉴于低频超声导波技术是管道在线检测的有效手段,本研究采用MsS导波技术对某平台的带套管的入海输油管道进行了在线检测试验,讨论了检测频率的选择要求,设计制作了试验样管,对样管进行了检测验证。样管检测和在用管道在线检测验证试验表明,MsS导波技术是解决海洋平台工艺管道在线检测技术难题的一种有效手段,可为今后同类管道的在线检测提供参考。     

Monte-Carlo simulation of industrial radiography images and experimental designs

In this article, we present a generic software for the simulation of gamma-ray radiography. This software simulates the entire radiographic system, from the source to the detector consisting of metallic screens and films. In an industrial context where the goal is to detect structural flaws in material like cracks, this simulator allows to compute gamma-ray images for different system parameters. By this way, engineers can choose an optimal set of parameters leading to the best image of flaws. We use Monte-Carlo techniques for the simulation of the whole system composed of a source, an object to inspect and a detector. The main contribution of this paper is to show that simulated images are coherent with real images although we use a simplified model for particle transport. Besides, we propose an acceleration technique to simulate the Markov chain of photon transport. Finally, an experimental design is performed leading to a linear model expressing the influence of the system parameters on image quality.     

Milling error prediction and compensation in machining of low-rigidity parts

The paper reports on a new integrated methodology for modelling and prediction of surface errors caused by deflection during machining of low-rigidity components. The proposed approach is based on identifying and modelling key processing characteristics that influence part deflection, predicting the workpiece deflection through an adaptive flexible theoretical force-FEA deflection model and providing an input for downstream decision making on error compensation. A new analytical flexible force model suitable for static machining error prediction of low-rigidity components is proposed. The model is based on an extended perfect plastic layer model integrated with a FE model for prediction of part deflection. At each computational step, the flexible force is calculated by taking into account the changes of the immersion angles of the engaged teeth. The material removal process at any infinitesimal segment of the milling cutter teeth is considered as oblique cutting, for which the cutting force is calculated using an orthogonal–oblique transformation. This study aims to increase the understanding of the causes of poor geometric accuracy by considering the impact of the machining forces on the deflection of thin-wall structures. The reported work is a part of an ongoing research for developing an adaptive machining planning environment for surface error modelling and prediction and selection of process and tool path parameters for rapid machining of complex low-rigidity high-accuracy parts.     

Development of a tool wear-monitoring system for hard turning

This paper describes an in-depth study on the development of a system for monitoring tool wear in hard turning. Hard turning is used in the manufacturing industry as an economic alternative to grinding, but the reliability of hard turning processes is often unpredictable. One of the main factors affecting the reliability of hard turning is tool wear. Conventional wear-monitoring systems for turning operations cannot be used for monitoring tools used in hard turning because a conglomeration of phenomena, such as chip formation, tool wear and surface finish during hard turning, exhibits unique behavior not found in regular turning operations. In this study, various aspects associated with hard turning were investigated with the aim of designing an accurate tool wear-monitoring system for hard turning. The findings of the investigation showed that the best method to monitor tool wear during hard turning would be by means of force-based monitoring with an Artificial Intelligence (AI) model. The novel formulation of the proposed AI model enables it to provide an accurate solution for monitoring crater and flank wear during hard turning. The suggested wear-monitoring system is simple and flexible enough for online implementation, which will allow more reliable hard turning in industry.