拉钩式定模抽芯机构在注塑模设计中的应用

本文介绍了拉钩机构的组成结构和应用于注射模设计的工作原理，说明了该机构的应用对简化模具结构、降低成本、提高抽芯机构的安全性能和延长模具使用寿命等方面的作用。以及对模具综合质量产生的影响。     

南芬铁矿下盘边坡滑体成因及防治措施探讨

针对南芬铁矿近年来下盘边坡频频出现滑体，严重影响矿山正常生产的实际情况，笔者主要从滑体形成的因素及如何采取措施进行防治的角度提出自己的一些看法和见解，供大家参考。     

台前斜坡沉积特征对黄石—广济铅锌(银)矿带的控制

本文着重讨论该地区早三叠世台前斜坡的位置及沉积特征。详细论述了上斜坡塌积角砾岩和滑积角砾岩的特征与区别。在此基础上,阐述了铅锌(银)矿带与塌积角砾岩的成因联系和矿带的分布。     

投影片数字化制作方法初探

介绍了采用数字成像制作投影幻灯片的基本过程、仪器，包括通过扫描仪、数字式照相机和数字摄录一体机以及直接使用计算机处理软件的文件输入、使用ＡｄｏｂｅＰｈｏｔｏｓｈｏｐ的文件数字式处理以及投影图像的各种打印机输出。     

Effect of thermal deformation on machine tool slide guide motion

This paper describes the effects on machine slide-guide contact conditions caused by thermal deformation. Since a slide guide has a large friction surface, the motion is greatly influenced by thermal distortion caused by heat generation in the ball nut and the bearing support, during machining processes. This study investigated the typical behavior of the friction coefficient in response to both the external load and the linear speed. This then led to investigating the thermal effects on the slide motion. The thermal deformation of the slide table was measured with respect to the running time and the linear motion and the frictional power were monitored and compared directly with the thermal distortion.     

运用多媒体改革经济数学教学存在的问题与对策

如何将多媒体技术有效地应用于经济数学课堂教学中．是目前经济数学教学改革值得注意的问题。结合教学实践,分析当前经济数学多媒体教学存在的问题,提出经济数学课程使用多媒体教学必须结合课程的特点。教学的需要以及学生的实际情况,将传统黑板教学与多媒体教学优势互补,以实现最佳教学效果。     

浅析车削多线螺纹的技巧

在普通车床上车削多线螺纹是很普遍的,用小溜板分线法车削多线螺纹是最常见的方法之一,主要从几个方面分析车削多线螺纹的技巧及在车削过程中遇到的各种问题及解决方法。     

转炉滑板挡渣液压系统功能改进

针对滑板挡渣系统不稳定、漏油事故频发及未实现预期功能的问题,对滑板挡渣系统易漏部位密封形式及材料进行改进,对系统的设计缺陷也进行了改进,从而有效地控制了漏油频率,使滑板挡渣达到了预期的功能,同时也提高了钢水质量。     

Effects of entraining velocity of lubricant and sliding velocity on friction behavior in stainless steel sheet rolling

A series of experiments was carried out using a rolling-type tribometer to investigate the effects on friction behavior of the entraining velocity of the lubricant at the inlet to the contact zone (V) and sliding velocity during deformation (ΔV). Experiments with stainless steel sheets of two different surface roughnesses showed that the variations in the friction coefficient with entraining velocity V and sliding velocity ΔV are largely dependent on the initial surface texture of the workpiece. For a smooth workpiece, the friction coefficient decreases with increasing sliding velocity ΔV but keeps almost constant with increasing entraining velocity V. However, for a rough workpiece, the friction coefficient initially decreases slowly and increases largely with increasing sliding velocity ΔV or decreasing entraining velocity V. Observation of the rolled surface for a smooth workpiece shows that, with increasing entraining velocity V, the slip band becomes more marked, and with increasing sliding velocity ΔV, the rubbed portions become more conspicuous. For a rough workpiece, galling occurs at high sliding velocity ΔV. The critical condition for galling outbreak is shown on the V-ΔV graph. The galling outbreak process is observed by interrupting the rolling process.     

平动齿轮机构啮合效率的计算

对平动齿轮机构啮合过程中齿廓间的相对滑动进行了分析 ,探讨了平动齿轮机构啮合效率的计算方法 ,并给出了节点内啮合的平动齿轮机构的效率计算公式 ,用该公式对实例的啮合效率进行了计算 ,证明了该方法的正确性