提高压铸模具使用寿命的有效途径

通过分析试验，寻找影响铸模具使用寿命的因素，如模具的预热、脱模剂的种类和喷涂方法、模具材料的选择以及模具热处理工艺参数等。通过这些影响因素寻找规律性的关系，进而找到提高压铸模具使用寿命的有效途径和方法。     

Toward the incorporation of temporal interaction analysis techniques in modeling and understanding sociotechnical systems

The increased complexity of modern sociotechnical systems (STS) necessitates the need for a manageable representation of their attributes, to augment our understanding and enable the development of ways through which we can increase their effectiveness, efficiency, and safety. Although many of the methodologies developed in the Human Factors domain map and investigate system properties and network structures, the inclusion of the temporal dimension in the analysis of STS remains limited. In this paper we present how modeling and visualization of STS can be augmented with the incorporation of temporal interaction analysis techniques that enable a micro-level, fine-grained analysis of data. We provide an overview of temporal analysis techniques by breaking down their main function, requirements, types of research questions they can address, and the visualization properties they offer, attempting to enhance their use in system analysis. This overview can assist researchers in selecting an analysis technique, enabling the incorporation of temporality in STS analysis, and helping towards the design of improved and safer systems and interventions.     

热处理工艺对高炉矿渣微晶玻璃性能的影响

以某高炉矿渣为主要原料,采用熔融法制备了CaO-Al_2O_3-SiO_2系矿渣微晶玻璃。研究了热处理工艺对矿渣微晶玻璃力学性能的影响,得出热处理工艺影响因素的先后顺序为:核化温度-核化时间-晶化时间-晶化温度,确定最佳热处理工艺为:770℃核化3 h,930℃晶化2 h,在此热工艺条件下制备的微晶玻璃抗弯强度最大,为153.67 MPa。利用X射线衍射(XRD)、扫描电镜(SEM)、能谱(EDS)测试方法分析了矿渣微晶玻璃的显微结构和晶体微观结构。     

五轴混联机床运动学和动力学仿真

针对3-TPS混联机床的电动机参数选择和零件设计问题,通过在SolidWorks软件中建立混联机床的三维模型,然后把装配体模型导入到ADAMS/View里,仿真出各主动杆件的速度和驱动力曲线,获得了3-TPS混联机床的运动和动力特性,为机床的电动机选择和机构设计以及控制系统的设计提供了重要依据。     

蒙库铁矿深部巷道岩爆预测及控制技术

针对新疆蒙库铁矿井下采用竖井—平硐—斜坡道联合开拓的井下斜坡道延伸 902~884 m 段开挖过程 中发生的岩爆现象,分析了深部岩爆段巷道岩爆现象及成因,得到岩爆时的岩体结构和岩性特征,利用应力解除法 计算深部巷道岩体的三维初始地应力,确定了巷道围岩的本构关系,提出了深部巷道围岩岩爆预测方法。通过对 深部巷道岩爆控制有限元分析,表明锚网喷支护效果显著,保证了井下斜坡道延伸段在开挖施工工程的安全性和 矿井生产期间的长久稳定性,可以实现深部巷道的安全快速施工。     

Effect of Si on δ-Ferrite/γ-Austenite Transformation and M23C6 Precipitation During Solidification of X10CrAlSi18 Ferritic Heat-Resistant Stainless Steel

Herein, the δ-ferrite/γ-austenite transformation and the precipitation behavior of M₂₃C₆ carbides in X10CrAlSi18 ferritic heat-resistant stainless steel (FHSS) with various Si contents at a cooling rate of 100 °C min⁻¹ using confocal scanning laser microscopy (CSLM) are investigated. The findings reveal that γ-austenite preferentially forms along the δ-ferrite phase boundaries, and it progressively precipitates into the δ-ferrite phase as the temperature decreases. The increase in the Si content reduces the δ-ferrite/γ-austenite transformation temperature. It also inhibits the martensite transformation in the subsequent cooling process, decreasing the volume fraction of γ-austenite/martensite. M₂₃C₆ carbides are mostly found at the δ-ferrite and γ-austenite/martensite phase boundaries. Meanwhile, the nucleation of M₂₃C₆ carbides becomes more difficult as the volume fraction of γ-austenite/martensite decreases. Furthermore, the complex solidification mechanism of the nucleus is addressed.     

Relationship Between Gelatinizing Temperature and Enthalpy of Starch from Gramineous Crops by Differential Scanning Calorimetry

In this report endosperm starch granules from gramineous crops such as rice, barley, wheat, foxtail millet and proso millet were analyzed by Differential Scanning Calorimetry (DSC) and the relationship between gelatinized temperature and enthalpy were discussed. Peak temperatures (Tp) for gelatinization in these gramineous crops as a whole ranged from 57 to 80°C and enthalpy were distributed from 6.4 to 15.6 J/g. Crops having waxy phenotype, namely, rice, barley, foxtail millet and proso millet show a correlationship between Tp and enthalpy. A crop having no waxy phenotype such as wheat however shows no relationship between these parameters.     

虚拟数控技术在铣削加工过程中的研究

叙述了虚拟数控技术的发展现状及发展趋势.通过在VC平台上采用OpenGL技术建立虚拟加工环境,提出了数控铣削加工过程仿真系统结构及功能,同时在虚拟数控铣削加工过程中建立模型,从而进行虚拟环境下的几何仿真和物理仿真,实现产品的虚拟制造.     

局域精确定位的工业移动机器人惯性导航方案

为解决工业移动机器人投入使用前需沿路密集布设地面磁条或激光反射点等外部装置的复杂性,以及因工作路线固定而缺少灵活性的问题,提出了基于惯性器件和超声波传感器的局域导航方案。操作人员事先通过遥控器训练机器人从一目标位置沿特定路线运动到另一目标位置,从而生成训练路线。机器人工作在非目标区域,即定位精度要求不高的区域时,按训练路线进行惯性导航;进入到目标区域,即包含目标位置、需精准定位的区域时,利用超声波进行导航。所提方案缩短了使用前的准备周期,同时方便更改工作路线。通过仿真实验,验证了局域范围使用惯性导航和超声波定位相结合的方案是合理可行的。