Method for machining all-metal screw pump stator

A processing method and pump stator technology, which are applied in metal processing equipment, electrochemical processing equipment, manufacturing tools, etc., can solve the problems of long processing length and large cutting amount, achieve high forming accuracy, high production efficiency, and reduce processing difficulty. Effect

Inactive Publication Date: 2012-06-20
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the domestic electrolytic machining process has mature experience in forming long-head (more than 5 heads) screw drilling tools with equal wall thickness of about 3 meters, the metal stator with longer processing length, larger cutting volume, and fewer heads (2 heads) Haven't tried it yet

Method used

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  • Method for machining all-metal screw pump stator
  • Method for machining all-metal screw pump stator
  • Method for machining all-metal screw pump stator

Examples

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Embodiment Construction

[0013] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0014] A method for processing an all-metal screw pump stator, comprising the following steps:

[0015] 1) The processing of the stator blank 1 is completed, and the stator blank 1 is formed with a central hole for forming the inner cavity of the stator.

[0016] 2) The inner cavity of the stator is formed by electrolytic method;

[0017] The specific steps are:

[0018] 1) Fix the stator blank 1 on the electrolytic processing equipment, and put the electrode assembly in the center hole of the stator blank 1, see figure 1 , the electrode assembly includes a processing electrode 2 and an electrode rod 4 coaxially fixed thereto;

[0019] The processing electrode 2 is provided with a forming section and a sealing section; a sealing ring 3 is ...

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Abstract

The invention discloses a method for machining an all-metal screw pump stator. The method comprises the following steps of: 1) machining a stator blank, so that a central hole for forming a stator inner cavity is formed in the stator blank; 2) forming the stator inner cavity by an electrolytic process; 3) polishing the stator inner cavity; and 4) performing surface-hardening treatment on the stator inner cavity. According to the method, the problem of difficulty in machining of the all-metal screw pump stator is solved by combining polishing treatment and surface-hardening treatment by adopting the electrolytic process. The method has obvious advantages on the machining of materials which are difficult to machine and parts with complex shapes or thin-wall parts, and has the characteristics of wide range of the machined materials, high production efficiency, high forming accuracy, capability of recycling electrode assemblies and the like. By the method, the technical blockade of hydraulically-formed all-metal screw pump stators which are used abroad is broken through, and a new method for manufacturing the all-metal screw pump stator is opened up, so that the machining difficulty of the all-metal screw pump stator is reduced effectively, and the machining efficiency is improved.

Description

technical field [0001] The invention relates to a processing method for a screw pump stator, in particular to a processing method for an all-metal screw pump stator. Background technique [0002] At present, the screw pumps used in oil field production include rubber stator screw pumps and metal stator screw pumps. The rubber stator screw pump uses a rubber stator, which is easy to process and shape, but it is not suitable for high temperature wells and is easily damaged. The all-metal screw pump can withstand higher downhole temperature and is suitable for high-temperature wells. However, the stator cavity of the all-metal screw pump is complex and difficult to routinely process. [0003] At present, although foreign countries can process high-quality all-metal screw pump stators through hydroforming technology, due to the long-term technical blockade, there is currently no application of relevant technology in China. Although the domestic electrolytic machining process h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23H3/00
Inventor 刘志龙杨万有姚智翔
Owner CHINA NAT OFFSHORE OIL CORP
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