螺杆泵金属定子切削工艺研究

发布时间：2018-08-04 18:14

【摘要】：目前机械采油设备正在向高效、节能、环保方向发展。随着采油技术的不断发展,需求量的不断增加,常规的螺杆泵由于其需要周期性更换橡胶衬套,它的缺点是适用范围小、效率低、工作性能已不能满足当今发展的需要成为制约其发展的重要因素。螺杆泵金属定子作为一种新型的采油式容积泵,与传统等壁厚螺杆泵定子相比其具有承压能力高、能传递高粘度液体介质、导热性能好、有较高的使用寿命,能改善泵的性能,提高泵的采油效率。全金属定子螺杆泵具有十分广阔的市场应用前景,目前国内外学者对金属定子螺杆泵加大研发力度,对于全金属定子内螺旋曲面结构的加工也越来越得到人们的重视。目前金属定子内螺旋曲面主要的加工方法为内螺旋曲面包络镗削法及数控盘状刀具连续切削法,加工螺旋曲面用的刀具的设计是一个比较复杂的过程。以实际工作过程中转子在定子中的运动为起点,分析了转子和定子之间的啮合关系,计算定子与转子的运行轨迹,把转子替换成刀具用数控编程刀具的运行轨迹进行切削加工。切削力是导致切削加工件变形及刀具磨损的主要原因,利用有限元软件进行切削加工模拟仿真是预测切削力变化的重要方法;而任何金属切削仿真软件分析结果都会有一定的局限性,并不能完全的模拟实际加工过程。本文通过对金属定子的切削刀具的模态分析找到其共振频率及最大变形位置,对切入过程进行应变、变形等有关参数进行分析来论证金属定子切削加工的可行性。通过对刀具进行瞬态动力学仿真,分析刀具结构在任意时间变化载荷作用下加工过程中的动力响应的情况。切削力的仿真分析方法对制订加工工艺,减小加工变形,提高加工质量具有十分重要的意义。
[Abstract]:At present, mechanical oil production equipment is developing towards high efficiency, energy-saving and environmental protection. With the development of oil production technology and the increasing demand, the conventional screw pump needs to replace the rubber bushing periodically. Its shortcoming is that the application range is small and the efficiency is low. Performance has not been able to meet the needs of today's development has become an important factor restricting its development. The metal stator of screw pump is a new type of oil recovery type volumetric pump. Compared with the traditional constant wall thickness screw pump stator, its bearing capacity is high, it can transfer high viscosity liquid medium, its thermal conductivity is good, it has long service life, and it can improve the performance of the pump. Improve pump efficiency. All metal stator screw pump has a very broad market application prospect. At present, scholars at home and abroad increase the research and development of metal stator screw pump, and more attention has been paid to the machining of the helical surface structure of all metal stator. At present, the main machining methods of metal stator inner helical surface are inner helical surface enveloping boring method and NC disc cutting tool continuous cutting method. The design of cutting tool for machining helical surface is a complicated process. Taking the rotor motion in the stator as the starting point, the meshing relationship between the rotor and the stator is analyzed, the running track of the stator and the rotor is calculated, and the rotor is replaced by the running track of the NC programming tool for cutting. Cutting force is the main cause of cutting workpiece deformation and tool wear. The simulation of cutting force by finite element software is an important method to predict the change of cutting force. However, any metal cutting simulation software will have some limitations and can not completely simulate the actual machining process. Based on the modal analysis of the cutting tool of metal stator, the resonance frequency and the position of maximum deformation are found, and the related parameters such as strain and deformation in the cutting process are analyzed to prove the feasibility of machining the metal stator. Through the transient dynamic simulation of the tool, the dynamic response of the cutting tool structure during the machining process under arbitrary time varying load is analyzed. The method of simulation analysis of cutting force is of great significance to the establishment of machining technology, the reduction of machining deformation and the improvement of machining quality.
【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】：TE933.3;TG506

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