Abstract
The paper studies the complicated problem in the spinning process of the shell with longitudinal and latitudinal inner ribs. The finite element software ABAQUS is used to establish the finite element model of the cylindrical shell with the longitudinal and latitudinal inner ribs. The numerical simulation of the spinning process is carried out. The stress distribution and strain distribution of the inner and outer surfaces during the spin-forming process are determined, and the orthogonal test method is used to determine the optimization process test parameters. The influence of the main process parameters on the wall thickness difference of the inner rib shell is obtained by the range analysis: wall thickness reduction rate > rotary wheel feed speed > rotor working angle (arranging according to their influences). And then the corresponding process parameters recommended by the spinning test are given. The measurement problem of inner ribs is solved by building of the robot shape measurement system which helps detect the three-dimensional shape of the inner ribs, and the precision of the spun sample was detected by the point cloud deviation comparison.
Highlights
Due to the limitations of equipment and processing capabilities, large-diameter and high-strength steel cylindrical parts, such as the launch vehicle engine casing, are often cast, welded, or milled domestically
The casting process was prone to blisters and loose structures with too large weight of the cast products; the welding process parts would generate excessive stress, and the chemical milling process causes too much pollution to meet the requirements of sustainable development [1, 2]
The parts which are spun by the spinning process have the internal reinforcing ribs as the result of the spinning flow of the metal and do not generate excessive stress like the welding ribs
Summary
Due to the limitations of equipment and processing capabilities, large-diameter and high-strength steel cylindrical parts, such as the launch vehicle engine casing, are often cast, welded, or milled domestically. There are many advantages to use a spinning process to obtain a cylindrical parts with longitudinal ribs or latitudinal ribs, the forming process is influenced by some spinning parameters, such as the thinning reduction rate, the spindle rotation speed, the gap between the rotary wheel and the mandrel, the feed amount, the lower amount, and the working angle of the rotating wheel [7, 8]. In order to obtain a qualified finished product with longitudinal and latitudinal inner ribs, it is necessary to bring all the influencing parameters into the spinning system for testing, obtain the best combination of parameters from a large number of tests, and follow up with the best parameters in processing. Later by constructing the robot topography measuring system, the sample underwent three-dimensional shape inspection and verification of its accuracy
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