螺杆泵啮合原理与专用刀具设计技术研究

发布时间：2018-09-07 16:01

【摘要】：三螺杆泵是一种典型的转子容积式泵,随着近些年来我国石油化工领域的快速发展,三螺杆泵的应用范围不断扩大,对三螺杆泵的需求也持续增长,而对三螺杆泵的主要零件螺杆的生产精度要求也很高,加工螺杆的成形铣刀设计也较为复杂,这也是限制螺旋曲面加工技术发展的主要原因,目前我国在这领域的研究也较薄弱,因此需要对螺杆的螺旋面加工技术进行更加深入的研究。本文以135型三螺杆泵的螺杆转子为研究对象,着重研究螺杆转子的螺旋曲面的形成原理、加工方式以及正常工作状态下螺杆的受力情况,对比目前螺杆曲面的加工方法,研究各方法的加工原理,确定选择成形铣削的方式进行螺杆的曲面加工。本文根据空间啮合理论,由从动螺杆上的一个点,求出与之啮合的主动螺杆的形线方程,进而推导出与主动螺杆啮合的从动螺杆的形线方程,并求出成形铣刀与螺杆螺旋面接触线方程,利用坐标变换原理,把刀具与螺杆的接触线方程变换到刀具坐标系中,求出成形铣刀的刀刃廓形方程。运用计算机辅助设计的方法对螺杆进行建模,模拟加工过程,对比螺杆实际廓形与理论廓形,并对螺杆的受力情况进行分析。结果表明此方法加工螺杆的精度满足生产要求,表明这种加工方法是可行的,有实际生产意义,满足工程要求。通过本文的这些研究,为三螺杆泵螺杆转子设计提供了重要参考,是螺旋曲面加工方法的延伸,对螺杆螺旋形线优化,改善螺杆的受力情况和加工工艺有推进作用。
[Abstract]:Three-screw pump is a kind of typical rotor-displacement pump. With the rapid development of petrochemical industry in China in recent years, the application scope of three-screw pump is expanding, and the demand for three-screw pump is also increasing. The production precision of the main parts of the three-screw pump is also very high, and the design of the forming milling cutter for the machining screw is also more complicated, which is also the main reason for restricting the development of the helical curved surface machining technology. At present, the research in this field is relatively weak in China, so it is necessary to do more in-depth research on screw helical surface processing technology. In this paper, the screw rotor of 135 type three-screw pump is taken as the research object, the forming principle of screw surface, the machining method and the stress condition of screw under normal working condition are studied emphatically, and the machining methods of screw surface are compared. The machining principle of each method is studied, and the way of forming milling is determined to carry out the surface machining of screw. According to the theory of space meshing, the shape line equation of the active screw engaged with the follower is derived from a point on the follower, and then the shape equation of the follower meshing with the active screw is deduced. The contact line equation between the forming milling cutter and the screw helical surface is obtained. The contact line equation between the cutter and the screw is transformed into the tool coordinate system by using the coordinate transformation principle, and the profile equation of the forming milling cutter is obtained. The method of computer aided design was used to model the screw, to simulate the machining process, to compare the actual profile and the theoretical profile of the screw, and to analyze the stress of the screw. The results show that the precision of this method can meet the requirements of production, and the method is feasible, practical production significance, and meet the requirements of engineering. The research in this paper provides an important reference for the design of the screw rotor of the three-screw pump. It is an extension of the spiral curved surface machining method and can promote the optimization of the screw helical line and the improvement of the screw force and processing technology.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH327;TG714

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