基于虚拟样机的胶印机虚拟试验及串墨初始相位优化

针对胶印机结构复杂的特点,提出基于虚拟试验获得胶印机整机性能数据的方法.以SolidWorks,COSMOS/Motion和ADAMS为虚拟样机建模平台,构建了某型胶印机印刷色组的虚拟样机模型.在ADAMS中对胶印机虚拟样机进行虚拟试验,获得了胶印机整机的静力学、运动学和动力学仿真数据.通过对虚拟试验数据的分析,明确了该型胶印机振动的主要来源及激振力的时域、频域特征,为胶印机的动态优化提供了参考.为了进一步降低串墨机构给整机带来的振动,进行了以4个串墨辊串墨运动初始相位为因素的试验设计,优选出了一组最佳的串墨初始相位搭配方案,基本上消除了串墨运动对整机的影响,取得了较好的优化效果.     

矫直机氧化铁皮清扫装置的仿真研究

运用ADAMS软件,建立了热轧横切机组氧化铁皮清扫装置的虚拟样机模型,对其机构进行了动力学分析,揭示了氧化铁皮清扫装置的输送原理和动力学特性,并分析了影响输送速度的主要因素,为进一步研究开发相关清扫装置提供了参考依据。     

虚拟样机技术在立式行星磨设计中的应用研究

介绍虚拟样机技术,在对立式行星磨系统动力学分析的基础上,对其采用了虚拟样机技术,开发了立式行星磨的虚拟样机并进行了虚拟试验,得到了虚拟样机的优化模型,显示了虚拟样机技术的强大优势,同时,虚拟试验结果将对立式行星磨的实际生产制造具有理论的指导意义.     

椭圆振动筛系统分析与虚拟样机仿真

首先对椭圆振动筛系统进行动力学系统分析,探讨其椭圆运动轨迹的形成机理。在此基础上运用ADAMS虚拟样机技术,建立振动筛刚体系统虚拟样机模型并仿真,进一步验证了椭圆运动轨迹的形成机理,从而为椭圆振动筛的实际应用提供理论指导。     

基于ADAMS的液压泥炮回转机构优化研究

应用Pro/E和ADAMS软件建立了液压泥炮回转机构的虚拟样机模型,在优化分析的基础上,揭示了机构各点坐标对液压缸推力、液压缸行程以及关键点受力的影响,进而得到较为优化的液压泥炮回转机构样机模型。通过仿真优化设计回转机构,提高了泥炮的工作能力和性能,缩短了开发周期,降低了设计成本,为液压泥炮回转机构的设计提供了理论依据,具有一定的工程指导意义。     

锻造操作机钳杆机构系统仿真

研究了锻造操作机钳杆机构的结构形式及功能,分析其液压控制系统,建立其液压系统模型来对钳杆机构做进一步的分析。利用虚拟样机技术搭建该锻造操作机的机械模型和液压控制系统模型。利用ADAMS和AMESim接口技术,完成了钳杆旋转机构的联合仿真,并根据不同的液压系统控制方式,分别对钳杆旋转的位置闭环和流量补偿位置闭环机液系统进行仿真研究,表明钳杆旋转流量反馈位置闭环控制系统更适合于对钳杆旋转运动的控制。     

热轧卷取机助卷系统的仿真分析

借助虚拟样机技术,建立了热轧卷取机助卷系统虚拟样机模型。通过对虚拟样机进行仿真分析,得出压力补偿系数、重力补偿系数以及液压缸行程随助卷辊辊缝值的变化规律。从而为实际生产的助卷辊位置控制和压力控制提供了可靠的依据。     

基于ADAMS的锯片磨齿机拨齿机构接触仿真

通过在深入了解接触理论的基础上,针对锯片磨齿机的拨齿机构,在ADAMS中建立了该机构的虚拟样机,并根据机构的运动特性施加接触载荷,使其更加符合实际情况。在ADAMS中合理选择接触参数,通过仿真得到拨齿机构的力学参数和运动特性,达到了预期的目的。     

型钢堆垛机小车机构动态设计与仿真

根据型钢堆垛的工作要求,提出了一种新型的滑槽式型钢堆垛机;针对它的关键机构--小车机构,基于ADAMS软件建立了刚柔结合的虚拟样机模型,为型钢堆垛机小车机构的动态设计提供了高效的设计方法.提出了影响小车机构定位精度和动态特性的结构参数,对机构运动控制参数和结构参数进行了动态设计和仿真,获得了满足优化目标的设计值.     

炸药破碎机开发中的虚拟装配与运动仿真研究

基于CAD/CAE的一体化软件CATIA建立炸药破碎机的零件三维实体模型,对所建零件模型进行虚拟装配,然后对装配模型进行运动仿真分析,在数字化样机中对初始的运动机构进行干涉分析和运动仿真,实现了产品的装配效果模拟功能,验证了设计的可行性和实用性.     

转臂折叠式全液压开铁口机

目前,高炉开铁口机根据动力源可以分为气动、电动、液压三种类型.详细介绍了KD型转臂折叠式全液压开铁口机的机构组成、工作原理和结构特点.和其它类型的开口机比较,KD型转臂折叠式全液压开铁口机具有结构紧凑、工作可靠以及能和液压泥炮合理配合等优点,具有良好的应用前景.     

YDX-3L钻机在宝兴沟矿区深孔钻探中的应用

YDX-3L型全液压动力头式岩心钻机是由北京天和众邦勘探技术有限公司与国土资源部勘探技术研究所联合研制开发,专门为固体矿藏地表取芯作业设计,适用于金刚石绳索取芯等多种高效钻探工艺方法。以黑龙江省宝兴沟矿区钻孔ZK0005施工设计为例,介绍了YDX-3L钻机的性能参数,根据矿区地层条件及钻孔设计要求,重点对钻机在深孔钻进过程中钻压、转速及泵量的合理选择进行了分析,并对钻机在施工作业过程中存在的不足提出了一些改进建议和解决方法,以便该钻机能在不同矿区应用中发挥其最大效益。     

四杆五铰式开铁口机机构运动和变形分析

对梅钢4号高炉开铁口机进行了机构运动学分析,采用弹塑性有限元方法计算了控制连杆的弹塑性变形,从而找出了开铁口时钻杆对中出现较大偏差的变形机理。通过采用对控制连杆加固的技术措施,增大了控制连杆截面的惯性矩,有效地抑制了控制连杆的变形,从而使钻杆的对中精度满足了生产要求。     

厂坝大口径基岩孔施工技术

钻进大口径基岩充填孔、供(排)水、通风等专用钻孔,施工中最大的问题是钻孔偏斜,本文结合实例重点介绍通过钻具配备和钻进参数选择等防止钻孔偏斜的几种措施。     

Analysis of the drill hole orientation in anterior cruciate ligament reconstruction

In the reconstructive procedure of the anterior cruciate ligament (ACL), the relationship was investigated between the orientation of the drill holes from the isometric points and the deformity in the ligament graft. We first investigated, by numerical analysis, the optimal orientation of the drill holes for minimal deformation. Secondly, we experimentally by using eight fresh cadaveric knees, measured the relationship between the orientation of the drill holes and the bending angle in the grafts. The optimal orientation of the drill hole in the femur was found to be tilted 20 degrees laterally in the coronal plane and 23 degrees anteriorly in the sagittal plane. In the tibia, the drill hole should be directed 24 degrees medially and 50 degrees anteriorly from the isometric point. The numerically analysed bending angle corresponded well to the results from the experimental study. The deformation in the graft on the femoral side was larger than that on the tibial side. Therefore, the orientation of the femoral drill hole was concluded to be more important than the orientation of the tibial drill hole.     

复式桶形直眼掏槽中深孔爆破法掘进实验

针对井下气腿式钻机凿岩、浅孔爆破掘进方式存在的工作效率低、循环进尺短和掘进单位成本高等问题,提出等直径空孔复式桶形直眼掏槽中深孔爆破法掘进技术,并设计相应的爆破参数。通过分别采用YT-24型气腿式凿岩机钻孔、等直径空孔复式桶形直眼掏槽浅孔爆破,DF20-2BD型凿岩台车钻孔、等直径空孔复式桶形直眼掏槽浅孔爆破以及DF20-2BD型凿岩台车钻孔、等直径空孔复式桶形直眼掏槽中深孔爆破法在掘进相同长度（30 m）条件下进行现场试验,得出在3种不同的凿岩爆破方式下各钻孔单位耗时、钻爆单位成本和平均循环进尺等指标。结果表明,采用DF20-2BD型凿岩台车钻孔、等直径空孔复式桶形直眼掏槽中深孔爆破法掘进不仅可降低钻爆单位成本,而且能有效提高平均循环进尺。     

钻探深孔钻进技术与经验

胶东招平断裂带岩心钻探深孔钻进施工.对金刚石钻头与扩孔器、钻进参数、护壁材料及配方等优化选取.深孔钻进操作、孔内事故的预防与处理等方面采取一系列措施,取得了成功经验.深孔钻进的实现,为深部地质找矿提供可靠资料.     

Cellular regulation of prostaglandin H synthase catalysis

PURPOSE: To determine the pullout strength of adaption screws in laryngeal cartilage and its relationship to drill hole and screw diameter. MATERIALS AND METHODS: Screw pullout strength in human cadaver thyroid cartilage was measured using a load cell. Screw sizes of 1.3, 1.5, and 2.0 mm were tested using drill hole diameters of 0.76, 1.1, and 1.5 mm. RESULTS: Maximum pullout strength was achieved using a drill hole diameter of 0.76 mm and a 1.5 mm screw. Pullout strength for this combination was 27.5 N. CONCLUSION: Adaption screws can be used in thyroid cartilage but pullout strengths will be less than in bone. Drill holes for screws in thyroid cartilage should be smaller than those used for cortical bone. Maximum strength will be achieved using a 1.5 mm screw in a 0.76 mm drill hole.     

On Heat Treatment and Surface Characterization of Spark Eroded Nickel-Based Superalloy Developed by Additive Manufacturing

In this study, a nickel-based superalloy Inconel 718 material was developed through direct metal laser sintering process. To enhance the mechanical properties, printed material was heat-treated at two different conditions in the combination of solution and ageing. The transformations of microstructure from original anisotropic phase were studied using optical microscope. The changes in mechanical properties were evaluated. The hardness of the heat-treated samples obtained is 35HRC and 39HRC for the heat treatment plan at 1100 °C + 845 °C and 980 °C + 720 °C (solution + ageing), respectively. Further, micro-holes were machined on these two material samples using spark erosion micro-machining or micro-electric discharge machining (µEDM) process. Applied voltage, capacitance and material hardness were three major variable parameters. Experiments were performed with hollow tungsten carbide rod of 300 µm in diameter as a drill tool rotating at a speed of 1500 rpm for a constant machining time of 30 min. Optical and scanning electron micrographs were used to analyse the hole quality and therefore the performance of µEDM. Perfect concentric drill hole was produced with 35HRC sample than the other. Weld spatters and metal drops were found around the surface of 39HRC sample. The range of drill hole varied to a maximum of ϕ385 µm in low-hardness and ϕ400 µm in high-hardness samples. The depth of drill hole was maximum with high hard sample at 100 V and 100 nF process condition. Light spectroscope-based roughness characterization revealed that the minimum surface roughness measured was 6.946 µm in low hard and 9.829 µm in high hard material.     

金刚石绳索取心钻探工艺钻探深孔实际应用总结

主要介绍利用现有的能力较低的钻探设备，运用绳索取心钻探工艺钻进深孔的经验。