Machining technology of slide plate special for passengers

Abstract

The invention relates to a machining technology a slide plate special for passengers. The technology comprises the following steps of: a. selecting a spheroidal graphite cast iron with the ball iron card number of QT400-18L; b. wholly casting a cushioning plate with a furan resin sand casting technology, and controlling the surface roughness to be within Ra50; c. putting a casting part into a furnace to be heated at 730-750 DGE, keeping the temperature for 2-4h, controlling the temperature in the furnace at 580-610 DEG C, withdrawing the casting part, and naturally cooling; d. mechanically machining; and e. compositely treating the surface of the casting part by means of QPQ salt bath. The machining technology wholly molds the slide plate with the spheroidal graphite cast iron, has high integrity, is more obvious in shock absorption effect, has higher abrasive resistance, corrosion resistance and fatigue resistance, easily controls the deformation, has small internal stress and good cutting performance, simplifies various associated dimension chains by wholly casting, and greatly reduces the mechanic machining quantity, thereby having short production period, easily forming into line production, and being suitable for quantity production.

Description

technical field [0001] The invention relates to a processing method for rail transit turnout components, in particular to a processing technology for passenger-only sliding bed boards. 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 and repair investment, together...

AI Technical Summary

Problems solved by technology

However, due to the special shape of the passenger-only sliding bed, the passenger-only sliding bed on the domestic passenger railway track turnout is generally a steel welded sliding bed, that is, the upper and lower steel plates are welded around the four sides, and the two The middle part of the steel plate is just bonded, not integrated

This kind of welded sliding bed plate causes the part of the switch rail to be less elastic, and it is easy to cause irregularities in the longitudinal and transverse rigidity of the track structure steel rail. The dynamic action between the switch and the backing plate deteriorates the working conditions of the turnout. In actual use, the high-frequency vibration of the welded parts is likely to cause desoldering at the welding point, which shortens the service life of some parts of the turnout, and even endangers the turnout in severe cases. Driving safety to trains

In addition, due to the difficulty in controlling the welding deformation and the difficulty in processing the workpiece, the steel welding sliding bed plate has low processing efficiency and high production cost.

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