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The main purpose of stainless steel pipe fittings
Jun 02, 2018

With the development of spinning technology, spinning technology has gradually replaced the traditional process to produce stainless steel pipe fittings. Western developed countries have adopted a technical blockade against China for this technology. Therefore, our research goal is to achieve the ultimate thinning spin pressure on stainless steel pipe fittings, increasing the stainless steel pipe diameter to 800mm. It also develops and manufactures strong spinning equipment with corresponding specifications of pipe fittings, and realizes the localization of production technology for large diameter stainless steel pipe fittings. Stainless steel pipe fittings are mainly used in the aerospace and weapons industry. One of the most important advantages of the metal spinning process is the ability to make seamless, rotating body hollow parts, eliminating the discontinuities, strength reductions, and brittle fractures associated with welds. Concentration and tensile stress and other drawbacks. Based on the above force energy parameters, the body structure of the strong spinning machine was designed. Focusing on the comparison of the components of the rotary roller seat of the spinning press, the final scheme was determined; the axial feed system and the radial feed system were designed; the kinematics of the transmission components of the spindle component was analyzed; The designed unloading device was specifically introduced. Finally, the finite element software ABAQUS was used to analyze the strength and stiffness of the fuselage and movable beam of the spinning machine, and improvement measures were proposed for places where the design was irrational.

Stainless steel pipe fittings are the main load bearing main components on the bracket. 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 were studied. The strength design has always been the difficulty and hot spot of stainless steel pipe structural design. Whether it is an angled stainless steel pipe fitting or an axial/circumferential orthogonal fitting pipe fitting, a proper content of the annular layer can significantly increase the axial compression strength of the pipe fitting. After changing the 20% angle ply (axial ply) to the circular ply, the axial compressive strength of the stainless steel pipe with a winding angle of 20° has doubled, and the axial compressive strength of the orthogonal ply stainless steel pipe has also increased. Increased by more than 10%.

The stainless steel pipe fittings were analyzed by the finite element model for the bearing performance of the composite material thrust support on the X-33 reusable vehicle demonstrator and the Atlas V launch vehicle, and the comprehensive carrying capacity of the X-33 type thrust support structure was pointed out. The capability is good, and it is suitable for more complex load conditions, while the Atlas V-type thrust bracket structure has better compressive load carrying capacity, and it is suitable for the load conditions with the major thrust.

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