数控加工中心ATC弧面分度凸轮运动学问题研究

推导了弧面凸轮压力角和诱导主曲率的计算公式，对数控加工中心凸轮式自动换刀机械手(ATC)弧面分度凸轮的压力角和曲率进行了详细的分析，为ATC的优化设计和研究提供了理论基础，有助于ATC机构产品系列化的完成。     

气体辅助挤出中影响气垫形成及稳定性因素分析

对一种新型挤出技术———气辅挤出中的气垫层形成及其稳定性影响因素进行了实验研究和分析,对气体压力的研究表明,当气体压力高于熔体压力时,气流就会影响到挤出口模内熔体的流动,使挤出物表面出现竹节状突起,但气体压力太低时(实验条件下低于0.2MPa)形成不了稳定的气垫膜层;气体流量的大小影响到气垫层的厚度和气垫层内气体的速度,并可通过调整气体流量控制挤出物的截面尺寸;气体温度影响到气垫层的稳定,为保持稳定的气垫层,气体温度应保持和口模温度一致。     

筒形件正旋旋压力有限元计算及分析

采用三维刚塑性有限元法计算了筒形件正旋时的旋压力，并对各工艺参数对旋压力的影响进行了系统研究。     

颗粒介质传压性能的数值模拟和试验研究

文章作者自行研制了测试颗粒介质传压性能测试装置,通过试验,测得了多种颗粒介质在各种试验参数下的压力分布规律和应力应变关系。通过将颗粒介质作为连续体介质来处理,建立了研究颗粒介质传压性能的有限元模型,对不同试验参数下的颗粒介质,在承压筒底面上垂直压力分布进行了模拟计算。模拟和实测结果对比表明,应用连续体材料模型的模拟结果和实测结果较为接近。     

Hot-compression constitutive relation of as-cast AZ31 magnesium alloy

In hot-compression process, the various factors have obvious effects on the deformation behavior of AZ31 magnesium alloy deformation behavior. To understand the hot-compression constitutive relation thoroughly, the stress-strain behavior of AZ31 magnesium alloy at various strain rates and different deformation temperatures were investigated under maximum strain of 60%. The microstructure of the experimental alloy was studied in the hot-compression procedure. The experimental results show that the relation of peak flow stress, strain rate and temperature can be described by Z parameter which contains Arrheniues item. The strain rate and the deformation temperature are the key parameters affecting deformation activation energy.     

轧制折缘异型断面型钢轧制压力计算

论述了折缘型钢轧制过程中开口、闭口槽中金属变形，并建立各自的变形量，接触面积计算公式。探索了按变形特点分块计算轧制压力的方法，其计算结果与实测相比，较为符合，因此有推广使用价值。     

Process factors influencing spinning deformation of thin-walled tubular part with longitudinal inner ribs

As a successively and locally plastic deformation process, ball backward spinning is applied for the purpose of producing thin-walled tubular parts with longitudinal inner ribs. By simplifying ball backward spinning as forward extrusion mechanics model, slab method is used in order to solve spinning force. Based on plastic mechanics, the influence of the process parameters involved on formability of inner ribs as well as the quality defects of spun parts is analyzed so as to present an approach to acquire the desired parts. The quality of inner ribs is one of the critical tasks in obtaining the desired spun workpieces and the height of inner rib depends greatly on spinning material,ball diameter, feed ratio, and wall thickness of tubular blank. The knowledge of the influence of process variables such as ball diameter, feed ratio, and wall thickness of tubular blank on the spinning process is essential to prevent the quality defects of the spun parts and obtain the desired spun parts.     

采用可控压力冒口提高铸件工艺出品率

通过应用可控压力冒口，控制铸件内部的压力，减小了冒口的大小，提高了铸件的工艺出品率。     

小波分析在液压缸泄漏检测中的应用

本文介绍了一种基于小波分析的液压缸泄漏故障检测方法，通过检测液压缸工作腔压力信号小波变换在适当尺度上的极大值点，提取出压力信号的突变特征，从而为液压缸泄漏检测提供了定量的依据。