2017亚洲а∨天堂

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        Large gear carburizing quenching deformation causes and control

            Carburizing of large deformation of gear is directly related to the gear strength, accuracy and other quality indicators. For the case hardening of gear, especially for large gear, the deformation is large, and difficult to control. Not only will the larger deformation processing mill grinding increased, costs, and affect the manufacture of precision gears, reducing the carrying capacity, and ultimately life will be greatly reduced. Large deformation of gear carburizing heat treatment was mainly due to the workpiece generated in the machining of residual stress, heat generated in the process thermal stress and the stress and deformation of the workpiece weight arising from the joint action. Affect the deformation of the gear carburizing many factors, including gear geometry, the quality of raw materials and metallurgy, forging and machining of residual stress, loading method and heat treatment processes and equipment, and other aspects. Control deformation, deformation hardening carburizing gear reduction to increase the carrying capacity and service life of gear, to shorten the manufacturing cycle, lower production costs are also of great significance.
             2 large deformation of gear case hardening.
             Life on the large gear and the greatest impact on the quality of the deformation from the gear diameter, normal length and helix angle. In general, deformation trends are as follows:
             2.1 Large deformation of gear: large gears after carburizing tip circle diameter was significantly swell trends, and tapered down uneven; diameter to length ratio (gear diameter / tooth width) the greater the diameter of a large number of the more inflation large. High concentration of carbon out of control, the gear diameter contraction trend.

         

        2017亚洲а∨天堂
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