Research on Symmetrical Rib Stripping and Rolling Composite Process and Its Equipment

doi:10.3901/JME.2024.08.132

Abstract

Abstract: In the face of my country’s huge demand for construction rebar and the requirements for efficient and precise manufacture of threads at both ends of the rebar, new processing techniques and equipment are urgently needed to meet the requirements. The relationship between the principles, characteristics and process parameters of various thread rolling processes is analyzed, and a new composite process for stripping and rolling of rebar is proposed. Based on this process, a symmetrical rib-stripping rolling equipment is designed and developed. The rolling die phase-maintaining mechanism and the symmetrical mechanism significantly improve the reliability and efficiency of the thread forming of the rebar. The deformation of the main shaft and the mode of the box are analyzed by statics. The plastic deformation and material flow law in the rolling process were analyzed by finite element analysis, and it is found that the equivalent strain of thread forming during the rolling process increases with the feed of the die, and concentrated around the tooth profile in the cutting section, the correction section and the forming section. The segments are distributed over the entire thread, and no stress or strain occurs in the blank core. The flow of flank material from the bottom to the top resulted in a gradual increase in the tooth height, and the axial displacement of the tooth root is the largest. The rib stripping and rolling test is carried out on the developed equipment to verify the feasibility and reliability of the rib stripping rolling process and its equipment. The results show that the increase of blank diameter could eliminate the defect of tooth tip. The die center distance is an important factor to ensure the dimensional accuracy of the formed thread.

Key words: rebar, thread rolling, rolling equipment, finite element, plastic deformation

CLC Number:

TG335

JIANG Fei, ZHAO Shengdun, FAN Shuqin, WANG Kexin, CHEN Chao. Research on Symmetrical Rib Stripping and Rolling Composite Process and Its Equipment[J]. Journal of Mechanical Engineering, 2024, 60(8): 132-142.

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