Processing method of integral-casting spherical iron base plate for high-speed railway

Abstract

The invention relates to a processing method of an integral-casting spheroidal iron base plate for a high-speed railway, comprising the following steps of: a. selecting spheroidal graphite cast iron, wherein the tensile strength of the spheroidal graphite cast iron is greater than 400MP, the yield strength is greater than 250MP, the elongation exceeds 18%, and the impact toughness at room temperature reaches 14J / cm<2>; b. carrying out integral casting on the base plate by adopting a furan resin sand casting process and controlling the surface roughness within Ra50; c. placing a casting into a furnace to heat to 730-750 DEG C, keeping the temperature for 2-4 hours, then controlling the temperature in the furnace to be 580-610 DEG C, and then taking out the casting for naturally cooling; d. mechanically processing; and e. carrying out QPQ (Quench Polish Quench) salt bath composite processing on the surface of the casting. The integral-casting spheroidal iron base plate is formed by integrally casting the spheroidal graphite cast iron, has high integrity, more obvious shock-absorption effect, higher wearing resistance, corrosion resistance and fatigue resistance, easy control of deformation, small internal stress and better machinability, simplifies various associated dimension chains, and greatly reduces the mechanical processing amount, thereby having short production period, easily forming line production and being suitable for batch production.

Description

technical field [0001] The invention relates to a processing method for rail transit turnout components, in particular to a processing method for integrally cast nodular iron backing plates for high-speed railways. Background technique [0002] At present, our country is in the stage of rapid economic development. As the main artery of the national economy, railway transportation is responsible for two important transportation tasks of freight and passenger transportation. With the continuous speed up of existing lines and the continuous improvement of the design speed of new lines, especially the construction of high-speed railways, the train speed will be greatly increased. Subsequently, the safety of railway transportation has shown its extraordinary importance. As a turnout, it is one of the important parts of railway tracks. Due to its large number, complex structure, short service life, limited train speed, and The characteristics of low safety and large maintenance a...

AI Technical Summary

Problems solved by technology

This kind of welding backing plate makes the part of the switch rail less elastic, and it is easy to cause the longitudinal and transverse rigidity of the track structure rails to be uneven. The dynamic effect between the switch and the backing plate deteriorates the working conditions of the turnout, shortens the service life of some components of the turnout, and even endangers the driving safety of the train in severe cases

In addition, due to the difficulty in controlling the welding deformation and the difficulty in processing the workpiece for the welding backing plate, the processing efficiency is low and the production cost is high