The rolling forming process of spur gear improves the production efficiency and material utilization, shortens the processing process, and the obtained parts have high tooth surface strength, good wear resistance, continuous and dense internal structure and good comprehensive mechanical properties. The rolling process of spur gear has a wide application prospect and is expected to become a new process method for industrial production.
Pater and Zbigniew rolled modulus M = 2, tooth number Z = 16 and helix angle with plate mill in the laboratory β= 30 ° 2618 aluminum alloy gear stepped shaft indirectly shows the feasibility of hot rolling production of spur gear.
Yu Jie and Wang Baoyu combined the rolling forming of spur gear with the traditional cross wedge rolling principle to complete the rolling forming of tooth profile while rolling shaft parts. The relevant mathematical model and finite element model are established. The die tooth profile and rolling tooth profile are a pair of conjugate curves, the influence of the position relationship between the blank and the die on the positive and negative displacement of the tooth profile, the influence of the initial shape of the blank on the forming defects of the concave tooth profile, and the influence of rolling temperature on the forming defects of “tip drawing” at the tooth top are analyzed and studied. The calculation method and variation law of die tooth pitch in each stage of rolling, the design method of die tooth profile, the calculation method of minimum feed when the die divides the rolled piece for the first time, and the variation law in each stage of rolling are given.
Xu Cailing designed wedge-shaped die and tooth shape die based on the machining principle of straight cylindrical gear generation method, and completed three-dimensional modeling to simulate the whole rolling process of involute straight cylindrical gear shaft. Based on the analysis of the simulation results, the equivalent stress-strain distribution of the rolled piece, the rolling forming force curve and the forming quality effect of the tooth profile are obtained.
Li he developed deform by programming in FORTRAN language and importing recrystallization model, and completed the simulation analysis of plastic forming and recrystallization process of 40Cr steel hot-rolled spur gear. Three important factors affecting the grain size of rolled spur gears are deformation, deformation rate and deformation temperature.
Zhu Xiaoxing and Zhu Ying established the thermal mechanical coupling finite element model of hot rolling forming of large module spur gear, converted the workpiece speed into roll revolution, and successfully realized the hot rolling forming process of spur gear. By simulating and analyzing the spur gear with M = 5 and tooth number Z = 61, the distribution laws of metal velocity field, temperature field and stress-strain field of hot-rolled spur gear are obtained. Point tracking is set on the metal blank to focus on the metal flow law at the tooth shape. The variation law of radial rolling force shows that the maximum rolling force is much less than that of forging.