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Talking about the precision forging process of roller body

by:Laike     2020-07-25
The material of the roller is 40Mn2, which is a medium carbon alloy steel. The shape of the part is: high hub with deep holes and flanges. The diameter of the part is large, the wall thickness is thin, and the metal activity is difficult. According to the characteristics of the existing equipment, the resolution adopts the open and thorough hot die forging forming method to reduce the deformation resistance. According to the layout of the roller and the characteristics of the precision forging process, it is certain that the outer and outer surfaces of the wheel body are indirectly precision forged and no machining allowance is left. Only a small amount of machining allowance is left in the inner hole, so that the material utilization rate and production efficiency Obvious progress has been made.

   The foundry production line adopted is the German Miller Wanjiadun PSH4450 fully active electric screw press foundry line. The production line realizes unmanned operation, high production efficiency, stable quality, and important process flow introductions are as follows:

   (1) Bar stock loading. Raw materials are fed by an active feeder, which increases the labor intensity of the operating staff.

   (2) The bar medium frequency feels heated. The heating temperature is controlled at (1200±30)℃, and the furnace mouth is equipped with an infrared temperature measurement installation and a temperature three sorting mechanism.

   (3) PSH4450 electric screw press casting. Three working steps are arranged on the press, namely upsetting, pre-forging and final forging. The bar upsetting process is heavy. If the scale on the outside of the bar is removed, the heading is up to a suitable height and can be accurately positioned in the pre-forging cavity. The plan of the pre-forging cavity in the precision forging process of the wheel body is extremely important. Its important role is to realize the pre-forming of the wheel body, which bears about 60% of the deformation, reduces the wear of the final forging cavity, and significantly improves the final forging die. Application life. The final forging die plays the role of subsequent forming. The draft angle of the cavity at the tread is planned to be 1°. There must be an upper and lower ejecting mechanism on the die to ensure the smooth release of the die and the final forging process. Due to the stubborn casting conditions, the robot adopted active spray for smooth cooling.

   (4) Trimming and punching of 400t crank press. The compound mold is used to realize trimming and punching at one time. The upper die discharge adopts a disc spring, and the lower ejector adopts a hydraulic type, which is convenient for the robot to accurately grasp the forging. This greatly improves production efficiency, reduces the number of equipment and molds and operating staff, reduces production costs, and can guarantee the quality of forgings.
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