{'fraction_non_alphanumeric': 0.02224199288256228, 'fraction_numerical': 0.0, 'mean_word_length': 5.25, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Establishment of mathematical model of roll-bending forming of sheet metal

Springback is a very important factor to influence forming accuracy of sheet metal. The key factor of precision forming and parameter setting is to accurately control springback. In view of the shortcoming of traditional trial-and-error method used to correct springback, a way based on dimensional analysis and orthogonal test is proposed to establish springback radius model for roll-bending of sheet metal. With this model, the nonlinear relation between spring back radius of sheet metal and move amount of upper roller, sheet thickness, yield strength, Young's modulus can be quantitatively solved, and it is used to roll-bending. On the basis, the choosing problem of the downward amount of upper roller, plate thickness, yield strength, modulus of elasticity was discussed in the forming process. The results show that the springback radius model, established with dimensional analysis and orthogonal test, is reasonable and effective. The modeling method is helpful to speeding up the progress of manufacturing and reducing production cost.