5 MN锻钢坯液压剪剪切回路及剪切缸特点分析

５ＭＮ锻钢坯液压剪是为某厂从国外引进的精锻机后部作业线配套由我国自行研制的。该机已通过部级技术鉴定,通过国内及国际联机检索,尚未见到锻钢坯液压剪切机方面的国内外文献报导。５ＭＮ锻钢坯液压剪一直在生产中发挥作用,收到了可观的效益。剪切回路和剪切缸是５ＭＮ液压剪液压系统的关键部分,本文较详细地介绍了剪切回路和剪切缸的特点,对液压系统和液压缸的设计有一定的参考作用。     

5MN锻钢坯液压剪剪切回路及剪切缸特点

５ＭＮ锻钢坯液压剪是为某厂从国外引起的精锻机后部作业线配套由我国自行研制的。该机已通过部级技术鉴定,通过国内及国际联机检索,尚未见到锻钢坯液压剪切机方面的国内外文献报导。５ＭＮ锻钢坯液压剪一直在生产中发挥作用,收到了可观的效益。剪切回路和剪切缸是５ＭＮ液压剪液压系统的关键部分,本文较详细地介绍了剪切回路和剪切缸的特点,对液压系统和液压缸的设计有一定的参考作用。     

进口液压剪冷却系统改造

1简介 CNS800-D11型剪切机系20世纪90年代初从东欧国家捷克进口的设备，该剪切机安装在鄂钢炉料厂，用于剪切废钢坯、废钢材等，是炉料厂的主要设备，工作频繁。     

液压滚切式金属板剪切机研发成功

一块60mm厚的钢板用普通机械剪切时可能会产生变形，甚至在生产时破坏辊道。 目前，这一问题得到了解决。由太原科技大学设计研发，太重集团、东北大学、山东巨能集团联合制造的液压滚切式金属板剪切机组装调试成功，实现了对中厚钢的高精度剪切，达到了国际水平，现已申请了国家专利，即将在河北文丰钢铁公司投入使用。     

变宽度圆盘剪切机的研究与分析

变宽度圆盘剪切机是板带及钢厂生产线上的重要设备。通过deform对变宽度圆盘剪切机对剪切高强度钢过程进行仿真分析,得出控制剪切质量的因素,从而得到更好的剪切质量,对板材生产过程具有较高的指导意义。     

新型Ⅲ级连杆机构液压滚切剪研究

通过对国内外现有的板材剪切机结构的原理分析,创新性地提出一种新型的单液压缸驱动的液压滚切式板材剪切机,获得PR-11RⅢ级杆组的复合连杆机构简化模型。在简化模型的基础上利用坐标转换的方法得出剪切机构上刀台上任意点的坐标表达式,以推广应用的某大型机械有限公司2 000 mm单液压缸驱动的液压滚切式板材剪切机研发项目为依托,借助MATLAB软件对剪切机构进行运动学仿真分析。仿真结果得出关键点的轨迹及上下剪刃重叠量的计算结果均符合实际生产要求,进一步证实了该新型单液压缸驱动的液压滚切式板材剪切机构设计的合理性与运动学模型的正确性。     

机器视觉系统识别钢直尺零位剪切机

钢直尺的生产工艺决定了头部零位刻度线位置需要有一道工序进行剪切,但目前生产制造厂商都是通过人工进行零位剪切,即依靠人眼判断剪切位置,通过常规剪切机来剪切.阐述了如何通过视觉系统识别钢直尺零位刻度线位置,进行全自动化生产.     

铝箔剪切机上料车改进设计

铝箔剪切机上料车是铝箔剪切机列中的设备之一,主要用于将需要剪切的铝箔卷材运送到铝箔开卷机上,再通过铝箔剪切机剪切成所需的宽度。我公司在重新设计上料车时,对原上料车的升降部分及车体进行了设计改进,取得良好的使用效果。     

液压开卷展平剪切微机控制系统

液压开卷展平剪切微机控制系统周恩涛，宋锦春，张志伟，周士昌（东北大学）一、概述开卷展平剪切机是冰柜生产厂的重要设备，它的作用是将钢板卷材剪成所需长度的平整板材。以往的生产方法是用人工一张一张剪切，效率低、周期长，精度不易保证。为提高生产效率，我们与某...     

高速精密剪切设计及其关键技术研究

根据电液锤的高速锻压原理,设计开发了液气驱动的高速精密剪切机,论述了其工作原理和结构特点。通过分析其运动过程,确定了剪切机在下降过程及回程中的主要技术参数,设计了液气驱动的高速精密剪切机的液压与气压系统,并介绍了其系统的动作顺序,完成了在高速运动情况下密封件的选择和设计,成功解决了设备漏油的现象,提高了密封件的寿命和设备的利用率,同时设计开发出了增加棒料约束的套筒剪切模具。所设计的剪切机具有剪切效率高、操作方便、所用剪切模具简单的特点,应用推广前景广阔。     

Formation of a flange from a flat blank with a hole

A model of axisymmetric formation of a flange from a flat blank with a hole by expanding by a hard punch with a fixed flat flange is given, taking into consideration contact friction, change of wall thickness, strengthening of material, and the tool bending radius. Elastic, elastic-plastic and hard-plastic process stages are studied.     

装载机新型工作装置设计理论的研究

推出了一种装载机工作装置的新型机构 ,克服了传统工作装置由于设计误差而产生的“干涉”现象 ,实现了无铲斗平移引导油缸工作装置 ,使其结构大为简化 ,设计极为简单。此外 ,还分析研究了这种新机构的设计计算方法。为今后进一步改进现有装载机工作装置提供参考     

Estimation of a Bottom Echo-Signal Level Reflected from a Plane Surface of a Cylindrical Article Using a Normal Probe Operating in a Pulsed Mode

The influence of the pulsed operating mode on a bottom echo-signal level reflected from a plane surface of a cylindrical article is studied during variations in the article's radius. It is shown that the pulsed character of a signal smoothens this function significantly as compared to that in the previously computed continuous mode. Numerical estimates of the bottom echo signal have been made for the ultrasonic inspection of wheel-pair axles of railway vehicles.     

某制冷压缩机爆炸事故的分析

广州市某冷库一台冷凝器压缩机在试压检漏时发生整体爆炸.经现场调查和对爆炸碎片、残骸的研究,分析了爆炸的过程,判断事故原因为试压工艺问题和操作不当,并给出了改进措施.     

Buckling of a thin spherical shell inside a spherical cavity of a contracting massive body

The problem of buckling of a thin elastic spherical shell inside a spherical cavity of uniformly contracting massive body is considered. This problem arises, for example, when designing pressure vessels made of composite materials with a thin metal cap layer. It is assumed that at the beginning of the compression the shell fits tightly against the wall of the cavity (to the rigid frame). An algorithm for searching the equilibrium state of the shell in the supercritical state is described. As a result of solving the problem, among other things, critical values of compressive strain and shell configuration in the supercritical state were obtained.     

Operation of a tight joint under a torque

A tight joint subjected to a torque is considered, in the case of pliability of the joint components and tangential pliability of the contact layer. On that basis, the torque distribution over the joint length may be determined more precisely, and fretting wear may be predicted.     

The use of a segmented cathode of a drift tube for designing a track detector with a high rate capability

Detector rate capability is one of the main parameters for designing a new detector for high energy physics due to the permanent rise of the beam luminosity of modern accelerators. One of the widely used detectors for particle track reconstruction is a straw-detector based on drift tubes. The rate capability of such detectors is limited by the parameters of readout electronics. The traditional method of increasing detector rate capability consists in increasing their granularity (the number of “elementary” detectors = readout channels) by reducing the straw diameter and/or by dividing the straw anode wire into two parts (for decreasing the rate per readout channel). A new method of designing straw detectors with a high rate capability is presented and tested. The method is based on dividing the straw cathode into parts and the independent readout of each part.     

Improved running-in of a frictional pair consisting of a cylinder lining and a piston ring

Improvement in the running-in of internal combustion engines by applying copper and antifrictional coatings to the cylinder surface is considered. The recommended optimal conditions correspond to higher surface quality and shorter running-in.