北京万寿寺天王殿多层彩画颜料成分研究

北京万寿寺是明清两代皇家寺院,为了解万寿寺建筑彩画颜料的使用情况,采用光学显微镜、拉曼光谱仪、扫描电镜-能谱仪等对天王殿内檐梁架处的5个多层彩画颜料进行了综合分析。结果表明:历史上万寿寺天王殿彩画至少经过3次重修,彩画绿色颜料主要为巴黎绿,红色颜料为铁红、铅丹,蓝色颜料为群青、石青,白色颜料为石膏、立德粉,金色为库金箔、赤金箔。内层一般为传统颜料,外层发现了合成群青、巴黎绿、立德粉等近代颜料。本次研究为万寿寺彩画的科学保护和研究提供了重要的一手资料。

Elbow precision machining technology by abrasive flow based on direct Monte Carlo method

The investigation was carried out on the technical problems of finishing the inner surface of elbow parts and the action mechanism of particles in elbow precision machining by abrasive flow.This work was analyzed and researched by combining theory,numerical and experimental methods.The direct simulation Monte Carlo(DSMC)method and the finite element analysis method were combined to reveal the random collision of particles during the precision machining of abrasive flow.Under different inlet velocity,volume fraction and abrasive particle size,the dynamic pressure and turbulence flow energy of abrasive flow in elbow were analyzed,and the machining mechanism of particles on the wall and the influence of different machining parameters on the precision machining quality of abrasive flow were obtained.The test results show the order of the influence of different parameters on the quality of abrasive flow precision machining and establish the optimal process parameters.The results of the surface morphology before and after the precision machining of the inner surface of the elbow are discussed,and the surface roughness Ra value is reduced from 1.125μm to 0.295μm after the precision machining of the abrasive flow.The application of DSMC method provides special insights for the development of abrasive flow technology.

可调式玻璃钢脱模机模芯设计分析

玻璃钢制品由于其优越的材料性能,目前在环保和建筑行业得到广泛应用。玻璃钢的脱膜是玻璃钢制品成型的关键技术,本文采用连杆机构设计出可调式是玻璃钢筒体加工脱模机模芯,并进行运动仿真分析,通过控制其水平运动位置,完成玻璃钢筒体的制作和脱模。

阀套交叉孔磨粒流精密加工质量分析

采用磨粒流精密加工方法对阀套交叉孔进行去毛刺处理,通过大涡模拟的方法和合理的亚格子模型对阀套工件在侧孔出流条件下进行数值模拟分析。在不同流速和黏度情况下,分析了流体应变率、速度矢量、壁面剪切力对交叉孔边缘圆角半径大小、毛刺去除以及径向孔壁面加工质量的影响。试验结果表明:流体黏度越低、速度越大,交叉孔边缘圆角半径越大;黏度越高、速度越大,径向孔壁面加工质量越高;为保证交叉孔边缘有较小的圆角,应选用低速、高黏流体进行阀套交叉孔的精密加工。

广元千佛崖睡佛龛造像彩绘颜料分析研究

睡佛龛开凿于唐高宗末至武周时期,造像多次妆彩。以睡佛龛造像彩绘为研究对象,应用Raman、XRF、XRD、SEM-EDS、PY-GC-MS等多种检测方法对彩绘颜料层进行分析研究,结果表明:历史上造像妆彩多达3次,彩绘红色颜料为铁红、铅丹、朱砂,蓝色颜料为青金石,绿色颜料为碱式氯化铜、石绿,白色颜料为硫酸铅,黑色颜料为炭黑,胶结材料为动物胶。该研究成果为后续保护修复工作提供了科学依据。