Roll Forging Process for Axle Forming of Railway Freight Cars

Abstract

The invention discloses a railway truck shaft forming roll forging process; the railway truck shaft forming roll forging process only adopts roll forging formation without needing a die forging process, and is only suitable for a roll forging machine of D1600 mm and a roll forging machine of larger than D1600 mm; and the maximum deformation of an actual occlusion angle of roll forging is in the 1 / 2 place of a blank, that is, a blank is separated from middle. After the four-gate roll forging is performed for one end, the four-gate roll forging is performed for the other end by turning; and the four-gate roll forging before turning and the four-gate roll forging after turning use the same roll forging process of the same one pair of roll forging molds. The process solves the problem of incapability of finishing the roll forging process on the roll forging machine of D1500 mm due to insufficient mold charging width of the roll forging machine of D1500 mm in a truck shaft with a square blank edge length of 300 mm, large size and high weight, prevents the shaft bending and deflecting phenomenon generated in a traditional process, improves the truck shaft production efficiency, largely changes the roll forging metal characteristics, and improves the bearing capacity.

Description

technical field [0001] A roll forging process used for railway wagon axle forming, especially in the whole forging process, no die forging is required and only four passes of roll forging are used. In the roll forging process, the same pair of Roll forging is a forging process in which the mold is used twice. Background technique [0002] In recent years, the railway freight industry has actively promoted the speed increase of heavy loads to alleviate the shortage of railway carrying capacity. The railway freight car axle is the most important part of the railway freight car vehicle, bearing the weight and load of the vehicle, and also bears the impact force and braking force when the train is running and parking, and the force is even more severe under the condition of high speed and heavy load. For the sake of complexity and safety considerations, there are stricter technical requirements for truck axles. Therefore, in addition to paying sufficient attention to the raw m...

AI Technical Summary

Problems solved by technology

[0004] The existing defects of these two processes: 1) During the forging process of railway wagon axle, it is required that the manipulator jaw should always keep concentric with the forging axle and follow the movement, so as to ensure that the forged axle does not bend

The manipulator originally used has no up and down movement during the forging process, so the number of bends and off-axis produced during production is large

2) The press is an old-fashioned three-beam and four-column structure, and it is difficult to balance the force on the four columns

Due to the "water hammer" phenomenon, the high-pressure pipeline of the machine body is often torn off, and the pipeline leaks at the same time. A large amount of emulsion needs to be replenished. In order to maintain continuous production, sometimes unemulsified tap water is used as an emergency supplement, resulting in serious corrosion of the hydraulic pipeline and causing The vicious cycle of leaking and replenishing tap water

3) Since the original hydraulic press has no means to control the reduction of the movable beam, in order to ensure the radial dimension of the forging shaft, the radial dimension of the forging shaft has to be ensured by closing the upper and lower molds. During the forging process, the upper and lower molds are frequently closed to ensure The radial dimension of the forging shaft, the fatal problem caused by the frequent closing of the upper and lower molds during the forging process: when the mold is closed, the load on the hydraulic press is the limit load, causing the main machine to loosen and the body to shake seriously. These problems Has seriously affected the normal production of the axle

[0005] In the patent ZL201110124547.9, four-pass U-turn roll forging was used, but there are disadvantages. (1) The position of the maximum deformation of the actual bite is not fixed at the U-turn roll forging, and it is easy to be misplaced between different passes. Roll forgings Folding occurs at the U-turn, which reduces the bearing capacity of the axle; (2) Round blanks are used in the roll forging process. Since the train axle is an ultra-long roll forging, the rolling forging mode of circle (material)-ellipse-circle is adopted, and the actual deformation is In the first pass and the second pass, the third pass and the fourth pass belong to the shaping process, and the torsion and instability are prone to occur during the roll forging process, resulting in bending of the truck axle after the entire roll forging process is completed; (3) The blanking size of this invention is The bearing part of the axle forging is also It can be seen that the bearing part has no deformation during the whole roll forging deformation, and the strength of the bearing part has not improved.

(4) And it is only suitable for D1500mm roll forging machine to complete, for blanks larger than For roll forgings with large blanks and large deformation, the total width of the four-pass roll forging die exceeds the die width of D1500mm

[0008] Due to the heavy weight and particularly long length of the railway freight car axle itself, the bearing part requires a strong bearing capacity, etc., the forging process blank for the railway freight car axle adopts a square section (L≥300mm) and the maximum deformation of the actual bite opening starts from the middle , and the roll forging process formed by the same pair of roll forging dies after U-turn roll forging has not yet been documented

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