随着科学技术的迅速发展，数控技术已是衡量一个国家机床制造业水平的重要标志。因此有必要使学生初步掌握焊接机的结构和相关操作，但一般焊接机由于体积大、价格高、很难适应教学的需要。为进一步提高教学质量，更好地实施素质教育、培养学生的创造性思维能力、实际动手能力和科研创新能力、便于教学、应有一套塑钢门窗三位焊接机中工位。它具有体积小、价格低、功能完善、安全系数高、性能优越等系列优点。
论文详细介绍了塑钢门窗三位焊接机中工位的设计过程，主要进行了数控铣床的机械部分设计，论证了各种方案的优缺点，从而在总体布局上有所把握。通过分析比较各种设计方案，根据合理性和经济性的指导思想，决定采用固定龙门式结构，床身导轨水平放置。在机械部分设计过程中，尽量考虑节约成本和互换性，保证X、Y、Z进给选用相同的步进电机、滚珠丝杠等零部件。本文详细的论述了塑钢门窗三位焊接机中工位的机械系统部分的设计与计算，包括部件的选择，各零件的选择、设计、计算等。此铣床配上数控系统可为学生提供大量的教学实验，满足学生的教学要求。
关键词：数控铣床；机械系统；精密；微型
With the rapid development of science and technology, numerical control technology has being an important indicator of the level of a national machine manufacturing industry. Therefore it is necessary for students to master the initial structure of CNC machines and related operations, but CNC machines in general are large, high prices, so it is difficult to adapt to the needs of teaching. In order to improve the quality of teaching, and better implementation of quality education and training of creative thinking ability of students, the actual practical ability and scientific innovation, facilitate the experimental teaching, the teaching should have a simple CNC milling machine. It has the advantages such as small size, low cost, fully functional, high safety factor, superior performance and so on.
This article on teaching the design of CNC milling machine gives a more reasonable design based on same factors such as the need to process the scope of the processing components, precision machine tools, and the demand of experimental, and detail some of the mechanical system design and calculation, including parts choice, the choice of the components, design, calculation and so on. CNC milling machine with this system can provide students with a large number of teaching experiments, and can meet the demands of teaching students.
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