Machining method for stator of all-metal screw pump for thickened-oil thermal exploitation

Abstract

The invention relates to a machining method for a stator of an all-metal screw pump; the adopted machining method is as follows: firstly, a central hole is machined on a metal bar, and then spiral grooves are machined by an electric spark machining method. A plurality of electrode tips, the intervals of which are equal to screw pitches of the spiral grooves, are arranged on a thinner steel tube; the steel tube with the electrode trips penetrates into a machined inner hole; and both ends of the steel tube are tightly clamped by insulation clamping heads and stretch toward one side or two sidesso as to ensure the straightness of the steel tube, thereby ensuring the interval between each the electrode tip and a workpiece to be equal in the overall length range. A workbench of an electric spark machine tool does a linear motion; the stator workpiece of the metal screw pump does a helical motion; the strict transmission ratio is ensured between the workbench and the stator workpiece of the metal screw pump, namely, the workpiece rotates for a circle, and the workbench walks for a screw pitch; as the number of the electrode tips is determined according to the number of the screw pitches, all electrodes simultaneously work and respectively finish the machining for one screw pitch so as to simultaneously finish the overall machining for internal spiral grooves of the stator. Electricsparks are used for machining the stator of the metal screw pump; as the electrodes do not contact the workpiece, a larger cutting force and the deformation of a cutter can be prevented when the cutter directly contacts the workpiece, thereby ensuring the machining precision. The machining difficulty can be greatly reduced; and the machining precision is improved.

Description

technical field [0001] The patent relates to a mechanical processing method, especially a processing method for heavy oil heating using an all-metal screw pump stator. Background technique [0002] The use of screw pumps as heavy oil recovery equipment in thermal recovery wells has been widely used in recent years because of its simple ground structure, convenient installation, small footprint, strong sand-carrying capacity, and high pump efficiency. However, conventional screw pumps use What is more important is that the rubber material is used as the stator, which is limited by temperature when used in heavy oil thermal recovery wells, and is very easy to age and peel off, which seriously affects the popularization and application of screw pumps. Using an all-metal screw pump can solve the limitation of temperature on the screw pump, but the length of the all-metal screw pump is generally 6-9 meters, and it is very difficult to process the spiral groove of the inner hole o...

AI Technical Summary

Problems solved by technology

[0002] The use of screw pumps as heavy oil recovery equipment in thermal recovery wells has been widely used in recent years because of its simple ground structure, convenient installation, small footprint, strong sand-carrying capacity, and high pump efficiency. However, conventional screw pumps use The rubber material is used as the stator, which is limited by temperature when used in heavy oil thermal recovery wells, and is easy to age and peel off, which seriously affects the popularization and application of screw pumps.

The use of all-metal screw pumps can solve the limitation of temperature on screw pumps, but the length of all-metal screw pumps is generally 6-9 meters, and it is very difficult to process the spiral groove of the inner hole of the stator, which is an important part.

Processing by rifling broaching or tool cutting, because the length of the workpiece is too long, the processing accuracy cannot be guaranteed

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