PRECISION FORMING DIE FOR WARM FORGING OF STRAIGHT BEVEL GEAR

摘要

Disclosed is a precision forming die for the warm forging of a straight bevel gear, the precision forming die comprising: a rough forging die formed by an upper gear die (1) and a lower cavity die (8) fitted with each other, and a precision forging die formed by an upper cavity die (15) and a lower gear die (21) fitted with each other, wherein the upper die of each of the rough forging die and the precision forging die is internally provided with a knockout structure composed of an elastic element to prevent a formed gear blank and a gear from adhering to the upper die; the outer circumference of the gear die of each of the rough forging die and the precision forging die is provided with a guide cylinder so as to ensure that the staggering amount of the upper die and the lower die does not exceed 0.3 mm and provide a prestressing force for the gear die, so as to prevent gear shape precision out-of-tolerance caused by deformation of the gear profile of the gear dies due to three-way pressure stress applied to the gear die; and the lower cavity die is provided with a floating die lifting structure which enables the lower cavity die to float and cooperate with a shaft neck of the lower cavity die for accurately positioning the blank, which ensures that the blank is evenly distributed in the gear shape of the gear die cavity during rough forging, reduces deformation after elimination of residual stress of the gear, and facilitates forging to form a recess structure, towards the interior of the gear blank, on the end face of the gear shape and the end face of the shaft neck of the gear blank, thereby improving the utilization rate of the blank.