Open Die Forging Precision Forging Parts Ring 20CrMnMo 34CrNi3Mo

Production of open die forging free forged products for car and crane projects

A ring forging quenching device includes a water tank for quenching ring forgings, a water inlet pipe is arranged in the water tank, the end of the water inlet pipe is located in the center of the water tank, and the water outlet direction of the water inlet pipe is vertically upward, and the water inlet pipe is arranged in the water tank. A number of impellers and a driving device for driving the impellers to rotate are evenly arranged around the tank, and each impeller faces the central part of the water tank. The utility model is suitable for quenching ring forgings, which can make the temperature of the quenching medium uniform, which is beneficial to avoid cracking defects and low quenching efficiency in the quenching process of the ring forgings, and greatly improves product qualification rate and production efficiency.

The adopted manufacturing process of hardness homogenization inside and outside of forgings includes the following steps: Quenching: Heat the workpiece to 880±5°C as soon as possible, and then carry out the first heat preservation. The first heat preservation time is proportional to the thickness of the workpiece. When the thickness is 1 inch, the holding time is 0.5 to 1 hour. After the first holding period of time, water cooling is performed; The second holding time is proportional to the thickness of the workpiece. When the thickness of the workpiece is 1 inch, the holding time is 1 to 1.5 hours. After the second holding time, the temperature of the workpiece is lowered to 620±5℃ and then the third holding time is carried out. , The third holding time is proportional to the thickness of the workpiece. When the thickness of the workpiece is 1 inch, the holding time is 1 to 1.5 hours. After the third holding time, the forgings are obtained by air cooling to room temperature.
When heating large forgings, if the charging temperature is too high or the heating speed is too fast, the temperature difference between the core and the surface of the forging will be too large, resulting in excessive internal stress and cracks. Therefore, when heating large forgings, to prevent the furnace temperature from being too high and the heating speed being too fast, heat protection measures should generally be adopted.

Our workshop covers over 8000㎡, which include electric furnaces, die forgings machines, CNC machining center, heat treatment and all kinds of testing equipment. With these advanced facilities & instruments, we are able to supply the high quality castings and forgings to our customers, and make products meeting comprehensive inspection requirements on chemical composition, mechanical properties, non-destructive testing and high precise dimensional inspections.