Abstract
The design theory and method of formed milling cutter for double-helix screw of progressing cavity pump are presented. Through analyzing the shape and characteristic parameters of double-helix screw, the helicoids equation and axial curve equation of double-helix screw were established. According to the relative position relations between formed milling cutter and double-helix screw in the machining process, the geometric mapping relationship of screw coordinate system and formed milling cutter coordinate system was established by using the coordinate transformation theory. Based on noninstantaneous envelope method and the meshing conditions between formed milling cutter and double-helix screw, the contact line equations were established by minimum value method. By analyzing the machining errors caused by resharpening the formed milling cutter, the tooth back curve equation was established based on spiral of Archimedes, and the profile equation of formed milling cutter with constant back angle was got. On this basis, the formed milling cutter of processing double-helix screw was designed, and the cutter head and tool post were manufactured, respectively. The measuring results have shown that this method can satisfy the requirements of machining accuracy for double-helix screw. So this is an effective method to get formed milling cutter profile for double-helix screw.
Highlights
With the difficulties increasing in oil exploitation, the traditional oil extraction equipment cannot satisfy the requirements of oil production
According to the profile equation of formed milling cutter for double-helix screw and the specific parameters, the cutting edge and profile of formed milling cutter can be got by calculation
According to the shape and characteristic parameters of the double-helix screw, the helicoids equation and the axial curve equation of double-helix screw were established, which laid the foundation for the profile equation calculation of corresponding formed milling cutter
Summary
With the difficulties increasing in oil exploitation, the traditional oil extraction equipment cannot satisfy the requirements of oil production. As one of the rising oil extraction equipment, the progressing cavity pump has been gradually applied in the oilfield exploitation with its superior performance. Theoretical calculation and experimental study show that the double-helix progressing cavity pump has more superior performance than the singlehead progressing cavity pump. Under the condition of same output capacity, its structure parameters correspondingly decreased. It is advantageous for improving the stress of rubber stator and prolonging the service life of progressing cavity pump. The double-helix progressing cavity pump is the main development trend and research direction of progressing cavity pump [1, 2]
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