A Method of Improving Local Comprehensive Mechanical Properties of High Manganese Steel Frog

Abstract

A method for improving the local comprehensive mechanical properties of high manganese steel frogs. The main method is to increase the height of the core rail and wing rail by 30-40mm within the range of 20-50mm width of the core rail when casting high manganese steel frogs. The horizontal length is 560mm; then the high manganese steel frogs are heated to 1100-1200°C and held at constant pressure for 3-6 hours to make the frogs fully austenitized; the high manganese steel frogs are placed on the mold and forged The high area is forged, the pressing height is 15-22mm, and only the forging part is raised, and the remaining raised part is mechanically cut off, and the cutting height is 15-18mm, so as to ensure that the overall working surface of the frog is at the same level; Manganese steel frogs were heated to 1150±10°C, and then water-toughened immediately after holding for 20-40 minutes to obtain a good single-phase austenite structure. The invention can reduce or even eliminate inclusion defects inside frog rails and wing rails to a considerable extent, improve wear resistance, prolong service life, and is relatively simple in operation, relatively low in cost, and can be popularized in a wide range.

Description

technical field [0001] The invention relates to the technical field of mechanical engineering, in particular to a method for improving the local comprehensive mechanical properties of high manganese steel frogs. Background technique [0002] Railway tracks are mainly composed of steel rails, sleepers, turnouts, connecting parts and so on. The turnout is generally composed of a switch, a frog and a guard rail, and a connecting part. The frog is the most seriously damaged part of the railway structure, and the core rail in the frog is the weak link in the operation of the turnout. [0003] High-speed, heavy-duty, and cross-section seamless lines are the general trend of railway development, and this puts forward new and higher requirements for the wear resistance and service life of railway frogs. Taking the high manganese steel frogs on the railway lines in service as the research object, the changes of the subsurface microstructure of the frogs during the service process w...

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Problems solved by technology

[0004] Patent CN201810109618.x proposes a local deformation heat treatment method for cast high manganese steel frogs. In this method, the frog is partially heightened, and the heightened part is forged. However, in this method, the forging process All the heightening parts are flattened, without considering the rigid area of ​​the lower part of the hammer head. During the forging process, due to the existence of a rigid area in the metal under the hammer head, it moves downward together with the hammer head, and the equivalent strain is almost zero. The size is related to the size of the hammer head, generally in the range of 10-30mm. Therefore, whether this invention patent can effectively improve the wear resistance and service life of high manganese steel frogs remains to be further explored.

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