高强度螺栓圆角冷挤压工艺研究

高强度螺栓头下圆角需进行冷滚压强化工艺，以提高螺栓的疲劳强度。通过研究实践证明，滚压前螺栓头下圆角的尺寸公差是影响滚压质量的关键因素之一。本文就滚压前的螺栓头下圆角尺寸公差与滚压变形的关系，研究了确定滚压圆角尺寸公差数值的方法，并给出了确定滚前圆角尺寸公差数值与滚压深度的关系线图。     

电磁式磁力滚压工具的研发及试验研究

磁力滚压是一种将磁技术和滚压技术结合的新技术用以提高长不锈钢管内表面质量。为了实现电磁式磁力滚压加工,研发出一套新型磁力滚压工具。通过对磁力滚压加工机理进行分析,得到电磁式磁力滚压加工滚压力的有效范围;基于滚压力的范围和工件的结构设计磁力滚压工具;利用Ansoft对系统磁路进行优化,确定出磁力滚压工具结构以及与之相匹配的滚压加工频率;搭建电磁式磁力滚压加工系统,对长不锈钢管进行磁力滚压加工试验。结果表明:电磁式磁力滚压工具有良好的加工特性,工件的有效滚压加工频率为(4～9)Hz,系统的最佳加工频率为9Hz。     

缸筒内径滚压前后改变量的结算

本文就刚性多锥柱滚压工具对圆筒形缸体内孔滚压量与滚压过盈量之间的关系进行了研讨，导出了单位接触长度最大滚压力与滚压过盈量的关系式以及缸筒内径滚压量的估算式，为这类缸筒以后的工艺制订与质量控制提供依据。     

滚压加工的应用

滚压加工是一种用于金属零件表面光整加工的有效工艺手段,本文通过在对大量工件尤其是大型零件的外圆表面及深孔的滚压加工实践中,总结了几种有效的滚压工具的结构,以及滚压工艺参数的选择及滚压加工的注意事项。     

曲轴圆角滚压强化系统设计

从曲轴圆角滚压强化的工艺要求出发，探讨了该工艺的实现方法，进而叙述了该工艺实现的系统设计；对曲轴圆角滚压强化系统设计的总体方案确定具有一定的参考价值。     

基于数控车床为平台的柔性滚压研究

描述了一种对回转类零件进行滚压的工艺方法，将滚压工具施压于工件表面产生变形，滚压压力可通过弹簧进行调节，滚压产生的变形能提高工件表面的光滑度和硬度。不同的压力和轴向进给速度可滚压出不同的粗糙度和硬度。     

螺纹冷滚压加工及其工具

本文主要论述了紧固件外螺纹的冷滚压工艺、冷滚压机床及其工具。重点提出螺纹冷滚压加工中的主要参数的确定。     

超长深孔滚压专用滚压头

为满足超长深孔滚压加工的工艺需要 ,设计了一种专用的滚压头。根据滚压工艺要求 ,以及考虑滚压头调整、使用的方便、可靠 ,提出了相应的技术要求。     

小模数渐开线花键齿轴的滚压技术

小模数渐开线花键齿轴的滚压技术有很多优点。就滚压加工涉及的工艺参数、滚模设计要点以及避免根切、齿形简化等问题，结合应用实例，进行了阐述与论述。     

孔滚压工艺

阐述了滚压工具结构与滚压量，孔径变动量等工艺参数的作用及相互关系，所列图表用以正确选择工艺参数。     

汽车前轴精密辊锻成形过程的数值模拟

汽车前轴的精辊-模锻工艺是一种用小成形力锻造设备成形较大型前轴锻件的塑性加工技术,其工艺关键在于精密辊锻。前轴的精密辊锻分4个道次,是典型的局部成形工艺。辊锻工艺由于旋转的模具与辊锻件之间的接触区域在不断变化,一直以来成为数值模拟的难点。对4个道次的模具建立了模型,采用三维刚塑性有限元程序DEFORM-3D模拟了前轴精密辊锻工艺,分析了辊锻过程中金属变形的规律,研究了模具参数对成形质量的影响以及辊锻力矩的变化规律。模拟结果对于改进辊锻工艺设计、提高模具设计水平具有指导作用。     

Experimental study for roll gap adjustment due to roll wear in single-stand rolling and multi-stand rolling test

To investigate a correlation between the amount of wear and roll gap (pass height) adjustment, we performed a single-stand reversible pilot groove rolling test as well as rolling test in an actual rod mill. In case of the pilot rolling test, we designed wear contour (profile) and machined it on the original roll groove (i.e., roll groove with no wear) to make the roll groove worn down. For the actual rod mill test, we developed a measuring device which can detect the actual wear profile. To determine the amount of roll gap adjustment, we propose a model for equivalent roll gap decrement which reduces the increased exit cross sectional area due to wear. We applied the proposed model to multi-stand rolling (roughing train of POSCO No. 2 Rod Mill) as well as single-stand reversible rolling. The wear profile of rolls worn down at each stand in mill yard was measured at different roll tonnage. The pilot hot rolling test shows that variation of exit cross sectional area is almost linearly proportional to roll gap change while the roll gap decreases from reference roll gap (6.5mm) to 3.5mm. In an actual rod mill which has consecutive rolling system, relationship between tonnage (total amount of tons that the produced rod weighs) and roll gap change at a stand is dependent on the rolling type (oval-to-round or round-to-oval) together with the cross sectional shape of incoming workpiece.     

冷弯型钢成型技术的发展现状

介绍冷弯型钢成型技术理论、成型工艺及冷弯成型计算机辅助设计（CARD）等方面的国内外发展现状,我国在冷弯型钢产业发展中存在的问题及对我国冷弯型钢技术发展的展望.     

Mechanics of roll edge contact in cold rolling of thin strip

Simulation of cold rolling of thin strip due to roll edge contact with oil lubrication was performed successfully using a developed influence function method. Roll edge contact and related surface roughness was discussed in this paper. The calculated rolling force, intermediate force and work roll edge contact force increase significantly when the reduction increases. The strip profile becomes poor with a higher reduction, and the calculated rolling forces are consistent with the measured values. A modified edge shape of work roll determined from the roll edge contact length and roll edge flattening value is helpful to reduce the work roll edge wear and to extend the work roll life. Surface roughness and asperity of the rolled strip are characterized by surface profilometer and atomic force microscope. The research shows that the surface roughness reduces with a higher reduction or rolling speed. The effect of the strip width on surface roughness is not significant.     

汽车扭力梁侧倾工况性能设计

主要阐述侧倾工况下扭力梁3个重要性能指标及其设计方法,即侧倾角刚度、侧倾前束角变化梯度和侧倾外倾角变化梯度。介绍相关结构参数和性能指标,建立整车-系统-结构三级性能指标的分解关系,提出一种侧倾性能结构布置长方体设计理念,通过汇总统计扭力梁结构参数和性能指标总结其常用范围,为扭力梁的性能设计提供参考。     

Fuzzy algorithm for calculating roll speed variation based on roll separating force in hot rolling

Thickness control of hot-rolled strips has become an important issue in recent years because of the need for improving the quality of the hot-rolled strip. For this purpose, various thickness control systems such as finishing mill set-up (FSU), automatic gauge control (AGC), and looper control system, have been developed at steel works. Although these systems have greatly improved the quality of the strip thickness, there still exists a small amount of thickness deviation. It is difficult to adequately control by applying conventional thickness control techniques since hot rolling process is a highly nonlinear system in which many process parameters are coupled. In this study, a fuzzy algorithm to calculate the roll speed variations was developed in order to improve the thickness uniformity of hot-rolled strips. Since the strip thickness is mostly affected by the magnitude of roll separating force depending on the roll speed, the strip thickness deviation between the desired and actual thicknesses can be reduced by controlling roll speed. In order to carry out this investigation, slab analysis was carried out to determine the relation between roll separating force and roll speed for various process parameters such as roll speed, reduction ratio, strip entry thickness, and front and back tensions. From the production data, the effective stress-strain rate relations of the materials used in slab analyses were acquired. Based on the analytical results, the relation between roll separating force and roll speed was approximated by a log function. A fuzzy algorithm was developed to determine variations in roll speed according to variations of roll separating force, depending on various ranges of rolling temperature, reduction ratio, front and back tensions, and strip thickness. In addition, simulations to predict roll speed variations for a small amount of thickness deviation were carried out at continuous finishing mills consisting of seven stands and the calculated roll speed variations were found to be reasonable. Thus, the developed fuzzy algorithm might be useful in reducing the thickness deviation in the actual hot rolling mills.     

高效轧辊车刀的研制

介绍了一种轧辊车刀的研制过程及使用效果,阐述了改进刀具结构对提高加工效率的重要性各和加工的经济性。     

冷轧连续退火机组中张力辊组主要参数的设计

以发电状态下两端带压辊和不带压辊的S辊组张力变化模型为基础,比较了不加压辊和加压辊以后张力辊平衡力矩的变化,推导了两张力辊偏移距、压辊直径的定量计算公式,讨论了防止打滑条件下张力辊组主要参数的设计过程.     

二辊矫直机辊形参数设计

从研究矫直原理入手，借鉴国内外先进的技术经验，设计了二辊矫直机。该机为当前比较先进矫直机，同时对金属变形理论、矫直工艺及矫直机械的设计制造进行了深入研究，给出了二辊矫直机辊形参数的确定方法。     

单轴变截面冷弯成型系统设计

冷弯成型是一种高效、节能、节材的板金属成型工艺。在阐述冷弯成型基本特点的基础上,介绍了一种新型冷弯成型技术—柔性冷弯成型的概念与系统构成。详细介绍了北方某大学研发的单轴变截面冷弯成型机的机械结构,阐述了实现板材变截面成型的基本控制策略,分析了变截面轧辊的控制系统结构与控制原理,简述了控制系统的软件平台。通过轧制实验,分析了变截面板材轨迹控制精度及各种影响因素,为今后进一步开发变截面生产线提供了有益的经验。