用压力机承压板测定岩石劈裂强度的研究

以峨眉地区白垩系夹关组红砂岩为研究对象,采用岩动力学方法测定劈裂强度,并进行了拉伸和压缩等辅助性试验,试验结果和理论研究表明,用承压板直接劈裂岩样是最方便的测试岩石劈裂强度的方法。     

双点800t压力机气垫的修理设计

本文从一台双点800t压力机的不多见的故障入手，提出了一套目前国内尚没有的修理方案。并综合吸收了一些化工产品在机械维修中应用的先进技术，意在抛砖引玉，为一些大、重、精零件的修理提供新的思路。     

螺旋压力机的建模

根据螺旋压力机动载荷特点，对各个阶段建立了力学模型，并用实验验证其正确怀，提出了影响螺旋压力机振动的主要因素，为后续减研究提供了理论依据。     

K4036压力机改造

随着新产品的开发以及新技术的出现,以往根据生产所需定购的最低配置压力机其功能已不能完全满足现生产的需要.面对这种情况,企业对现有设备进行一定程度的改造无疑是很明智的选择.     

压力机构设计中虚约束的研究

本交通过对压力机构设计中虚约束的分析及研究，纠正了压力机构设计研究中与虚的束有关的几种模糊认识及错误观点，并提出可确保压力机构的虚约束不起实际约束作用的必要条件。     

济南二机床：“老装备部”的新法则

作为制造机器的机器,机床工业的技术水平,决定着装备制造业乃至整个国民经济的技术水平。2008年7月,奥运圣火在山东济南传递。电视屏幕上,一位英姿飒爽的女士出现在人们视野中时,人们得知,这位女火炬手是来自济南二机床的女高工江秀花。此时,许多人不由问道:济南二机床     

定宽机宽度控制优化

对定宽压力机(以下简称定宽机)进行改进优化,主要包括定宽机入出口辊道换型,下夹送辊及下导向辊标高进行调整,压下头部短行程宽度控制的优化,减少了定宽机内出现封门瘫钢的故障,同时也解决了定宽机出口板坯头部失宽的问题。     

A method to calculate and counterbalance the inertia force of slider-crank mechanisms in high-speed presses

A new method to calculate and counterbalance the inertia force of slider-crank mechanisms in high-speed mechanical presses was put forward. By analyzing the kinematic characteristics of a center-located slider-crank mechanism whose crank rotates at a constant angular velocity, the kinematic parameters of the slide, connecting rod and crank were formulated approximately. On the basis of the results above, three inertia forces and the input moment in the mechanism during its idle running were investigated and formulated by dynamic analysis. A verification experiment was performed on a slider-crank mechanism at a high-speed press machine. The forces derived from the established formulas were compared respectively with those obtained by the ADAMS software and the classical method of connecting rod mass substitution. It was experimentally found that the proposed formulas have an improved performance over related earlier techniques. By use of these results, a 1000 kN 1250 rpm four-point high-speed press machine was designed and manufactured. The slide of this press is driven by four sets of slider-crank mechanisms with symmetrical layout and opposite rotation directions to counterbalance the horizontal inertia forces. Four eccentric counterbalance blocks were designed to counterbalance the vertical force after their mass and equivalent eccentric radius were formulated. The high-speed press machine designed by the proposed counterbalance method has worked with satisfactory performance and good dynamic balance for more than four years in practical production.