Study On The Process And Equipment Of J55 Spiral Tube Forming With Uniform Wall Thickness

Screw pump is gradually becoming one of the main extracting oil measures in our country’s oil fields, due to its simple structure, low cost, energy efficient and adaptable ability. But, conventional screws’ stator is covered by non-uniform thickness rubber layer inside, which occurs non-uniform expansion caused by rising temperature in the latter part of the operation. The non-uniform expansion of rubber decreases pump efficiency, reduces delivery lift, increases torque and shortens the life of screw. To solve the problems, we come up with screw pump of uniform thickness stator. It changes the stator’s shape, from original circular straight cylindrical to double helix shape. It can significantly solve the problem in the latter part of screw by filling with uniform thickness rubber layer. Spiral tube of uniform wall thickness is the core part to make new pump. Therefore, under the existing conditions, it’s meaningful to find a new manufacture process and to design corresponding equipment, which could realize mass production of uniform thickness stators meeting the requirements in precision and performance standards. It can largely improve efficiency and reduce the cost in extracting oil. This paper mainly studies the following aspects:Chapter 2 comes up with several methods to form the spiral tube of uniform wall thickness. Using finite element analysis software DEFORM-3D, it simulates each forming methods, analyzes the result of each methods, and finally it determines the ideal forming process—extrusion with outer and core mold.After determining the process, Chapter 3 designs the corresponding mold cavity and mold structure. It trims the mold cavity by using the simulation results. Using DEFORM-3D, this chapter explores the influence of coefficient of friction, forming temperature, extrusion speed and die preheating temperature respectively. Finally, it finds that, when forming at 1000℃,the extrusion speed at 10mm/s, and the mold preheating temperature at 600℃, the forming result of spiral tube is the best with minimizing the friction coefficient as much as possible.Chapter 4 completes overall design of forming lathe, using Solid Works to complete3 D design. And this chapter designs the power and transmitting device, the advancingdevice and the functional devices. Using the simulation force results, it calculates the power device, such as the motor and reducer. And it check the strength of leads screw to ensure its safety.According to the results of finite element simulation, using the made mold and lathe, chapter 5 carries out the forming test of spiral tube. Thereafter, this chapter tests the thickness and hardness of the spiral piece, analyzing their changes in different regions. It test the impact toughness and tensile properties of the material before and after forming, also testing different regions of spiral tube. Integrating the material microstructure before and after forming, it analyzes the extrusion forming process, and gives solutions to found problems.