空间曲线啮合轮传动机构的制造工艺研究

发布时间：2018-04-24 14:11

本文选题：空间曲线啮合轮 + 自动化靠模　；参考：《华南理工大学》2011年硕士论文

【摘要】：随着科学技术水平和社会生活水平的提高,机电产品微小型化成为趋势之一。目前,微小型或微型机电系统产品是高附加值的高科技产品。而微小/微传动机构是微小型或微型机电系统产品的关键部件,这使得微小机械传动技术的研究开发以及制造技术成为目前机械学科的研究热点之一。近年来课题组研究了一种新型传动机构—基于空间曲线啮合原理的空间曲线啮合轮传动机构。该机构可实现微小空间内的连续传动,可用于微小机构的驱动装置。本文在课题组前期建立的考虑钩杆直径的空间曲线啮合方程的基础上,完成以下主要内容: 首先,阐述了微制造技术的研究意义,介绍了国内外微制造技术的研究现状以及总结了课题组之前的研究成果。针对空间曲线啮合轮的主动钩杆与从动钩杆是空间曲线圆柱体的特点,设计了一种空间曲线啮合轮机构的制造装置——自动化靠模机构,这是一种能够简便快捷得到空间曲线啮合轮的制造方法。不足之处,由于轮体与钩杆是分开加工,在安装过程中会产生安装误差。为了克服自动化靠模法的制造精度的不足,首次采用光固化(Stereo Lithograph Apparatus, SLA)快速成型技术制造出主动轮与从动轮样品。实验结果表明,采用SLA技术获得的主动轮与从动轮样品具有很高的形状、尺寸精度,能够实现连续稳定地啮合传动。不足之处,由于材料选用光敏树脂,钩杆强度很低。为了快速精确制造出符合强度要求的空间曲线啮合轮机构,采用选区激光熔化(Selective Laser Melting, SLM)快速成型技术制造出主动轮与从动轮样品。重点提出用选区激光熔化技术快速制造空间曲线啮合轮机构,再由线切割去除支撑得到主动轮与从动轮样品。实验获得的空间曲线啮合轮样品具有很高的形状、尺寸精度以及强度。采用选区激光熔化快速成型设备与316L不锈钢粉末,得到的空间曲线啮合轮样品表面粗糙度值较大,无法达到传动要求。采用机械喷砂与电解抛光相结合的后处理工艺对啮合轮表面进行加工,加工后的啮合轮样品的表面粗糙度值从Ra 25μm减小到Ra 1.0μm。实验结果表明,采用的后处理工艺和参数获得的主动轮与从动轮样品具有很高的形状、尺寸精度,在一定的载荷下能够实现连续稳定地啮合传动。通过对靠模法、SLA、SLM三种制造方法的比较,得到SLM成型工艺以及机械喷砂与电解抛光相结合的后处理工艺和参数,是空间曲线啮合轮的一种较好的制造方法。
[Abstract]:With the improvement of science and technology and social living standards, the miniaturization of electromechanical products has become one of the trends. At present, micro-or micro-electromechanical system products are high-added high-tech products. The micro / micro transmission mechanism is the key component of micro or micro electromechanical system products, which makes the research and development of micro mechanical transmission technology and manufacturing technology become one of the research hotspots in the field of machinery. In recent years, a new type of transmission mechanism, spatial curve meshing wheel transmission mechanism based on the principle of space curve meshing, has been studied by our research group. The mechanism can realize continuous transmission in small space and can be used for driving device of micro mechanism. On the basis of the space curve meshing equation with the diameter of hook rod established by our research group, the main contents are as follows: Firstly, the research significance of micromanufacturing technology is expounded, the research status of micromanufacturing technology at home and abroad is introduced, and the research results before the research group are summarized. In view of the fact that the active hook rod and the follower hook bar of the space curve meshing wheel are the space curve cylinder, a kind of manufacturing device of the space curve meshing wheel mechanism-automatic modeling mechanism is designed. This is a simple and fast manufacturing method to obtain the space curve meshing wheel. Because the wheel body and the hook rod are processed separately, the installation error will occur in the installation process. In order to overcome the shortage of the manufacturing accuracy of the automatic modeling method, the samples of the active wheel and the slave wheel were first fabricated by using the light curing Stereo Lithograph Apparatus (slaa) rapid prototyping technology. The experimental results show that the active wheel and the sample of the slave wheel obtained by SLA technology have high shape and precision, and can realize the continuous and stable meshing transmission. The deficiency, because the material chooses Guang Min resin, the hook pole strength is very low. In order to rapidly and accurately fabricate the spatial curve meshing wheel mechanism in accordance with the strength requirements, the selective laser melting Laser melting (SLM) rapid prototyping technology was used to fabricate the samples of the active wheel and the slave wheel. The special area laser melting technology is used to fabricate the space curve meshing wheel mechanism, and then the active wheel and the moving wheel sample are obtained by wire-cutting. The space curve meshing wheel samples obtained from the experiment have high shape, dimensional accuracy and strength. By using selective laser melting rapid prototyping equipment and 316L stainless steel powder, the surface roughness of the surface of the meshing wheel with space curve is large, which can not meet the requirements of transmission. The surface roughness of the meshing wheel was reduced from Ra 25 渭 m to Ra 1.0 渭 m by the post-treatment process combined with mechanical sand blasting and electrolytic polishing, and the surface roughness of the meshing wheel was reduced from Ra 25 渭 m to Ra 1.0 渭 m. The experimental results show that the active wheel and the slave wheel obtained by the post-treatment process and the parameters have high shape and precision, and can realize the continuous and stable meshing transmission under certain load. By comparing the three manufacturing methods of SLA-SLM, the SLM forming process and the post-treatment process and parameters of mechanical sand blasting and electrolytic polishing are obtained, which is a better manufacturing method for space curve meshing wheel.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH132.4

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