Forged coupler knuckle is an important part of the coupler and draft gear of freight cars. Forged coupler knuckle is an important part of the coupling of two freight cars. It connects the coupler and the center sill of the car body to transmit traction and braking force during work. Its design and manufacturing quality directly affect the service life and driving safety. With the development of freight cars towards high speed and heavy haul traction, the loads on coupler and draft gear during train operation are becoming more complex, the service conditions of coupler are further deteriorated, and the fatigue fracture of forged coupler knuckle is also becoming more frequent. Fatigue failure is one of the main reasons for freight car separation accidents, which directly affects the safety of freight car operation.
By comparing and analyzing the forming processes of horizontal forging and vertical forging, it is found that the processing time of different types of forging knuckle is not different, and the horizontal forging has more advantages in forging efficiency, energy consumption, line drawing benchmark, processing quality, etc; The internal control of the processing size of the forging knuckle traction table can ensure that the deformation size of the traction table is within the tolerance range after the forging knuckle heat treatment, and ensure the qualified rate of the forged knuckle.
At present, F type and CQ type forged coupler knuckle are installed on export freight cars respectively. After application test, forged coupler knuckle has a service life much longer than cast coupler knuckle, which is highly recognized by users. On this basis, the 16D forged coupler knuckle suitable for China has been developed and is now under test.