The main purpose of stainless steel pipe fittings

With the development of spinning technology, spinning technology has gradually replaced traditional processes to produce stainless steel pipe fittings. Western developed countries have imposed a technological blockade on my country regarding this technology. Therefore, our research goal is to achieve the ultimate thinning and spinning of stainless steel pipe fittings and increase the diameter of stainless steel pipe fittings to 800mm. And develop and produce powerful spinning equipment for pipe fittings of corresponding specifications to realize the domestic production of large-diameter stainless steel pipe fittings. Stainless steel pipe fittings are mainly used in the aerospace and weapon industries, and an important advantage of the metal spinning process is that it can make an overall seamless hollow part of the rotating body, which fundamentally eliminates the discontinuity, strength reduction, brittleness and cracks associated with the weld. Disadvantages such as tension stress concentration. Based on the above energy parameters, the body structure of the powerful spinning machine is designed. Focus on the comparison of the structure of the rotary wheel seat part of the spinning machine and determine the scheme; design the axial feed system and the radial feed system; analyze the kinematics of the transmission part of the spindle component structure; make a new design The unloading device is introduced in detail. The finite element software ABAQUS was used to analyze the strength and stiffness of the spinning machine's fuselage and movable beam, and improvement measures were proposed for the unreasonable design. Stainless steel pipe fittings are the main load-bearing components on the bracket. Research on the structural design and optimization of stainless steel pipe fittings, the preparation technology of stainless steel pipe fittings, the theoretical design and experimental analysis of axial compression performance, etc. are carried out. Strength design has always been the difficulty and hot spot in the structural design of stainless steel pipe fittings. Whether it is angle-layered stainless steel pipe fittings or axial/circular orthogonal layered pipe fittings, a proper amount of hoop layer can significantly improve the axial compressive strength of the pipe fittings. After changing the 20% angle layer (axial layer) to the ring layer, the axial compressive strength of the stainless steel pipe with a winding angle of 20 has been doubled, and the axial compressive strength of the orthogonally layered stainless steel pipe has also been improved. By more than 10%. Through the finite element model, the stainless steel pipe fittings are used to analyze the bearing performance of the composite thrust bracket on the reusable carrier verification machine X-33 and Atlas V launch vehicle, and the comprehensive bearing capacity of the structure of the X-33 thrust bracket is pointed out. It has better capacity and is suitable for more complex load conditions, while the Atlas V thrust bracket structure has a better compression bearing capacity and is suitable for load conditions dominated by large thrust.