Constant displacement quality control method of steel rail flame welding heating and post-weld normalizing

A quality control method, flame welding technology, applied in the direction of comprehensive factory control, comprehensive factory control, electrical program control, etc., can solve the problems of inability to automatically adjust, large human factors, and low temperature control ability, reaching The process of detection and control is simple, the anti-interference is strong, and the stability and reliability are improved.
CN101813939BActive Publication Date: 2012-01-25SOUTHWEST JIAOTONG UNIV +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHWEST JIAOTONG UNIV
Publication Date
2012-01-25

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Abstract

A constant displacement quality control method of steel rail flame welding heating and post-weld normalizing comprises the following steps: locking an upsetting oil cylinder by controlling a magnet valve and a pilot operated check valve on the stock cylinder oil circuit of the upsetting oil cylinder so that the longitudinal displacement of the steel rail keeps constant; simultaneously, detecting the retaining pressure of the upsetting oil cylinder in real time through a pressure sensor, and then calculating and obtaining the temperature of the steel rail according to the curve of the relationship between the preset welding temperature of steel rail and the longitudinal deformation resistance of steel rail; when the temperature of steel rail reaches the preset welding temperature, controlling a heating device to stop heating, carrying out upsetting pressure retaining shearing, air-cooled cooling and post-weld normalizing. The method is capable of automatically controlling the temperature of gas-pressure welding and pressure retaining and normalizing of steel rail in closed loop, thereby having few control input parameters, simple and convenient operation, accurate control for temperature, strong anti-interference, small error, high precision, good technical uniformity and repeatability, more stable and reliable welding quality, and high one-time welding success ratio.
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Description

technical field

[0001] The invention relates to a quality control method for air pressure welding and post-welding normalizing of rail transit seamless line rails. Background technique

[0002] Rail gas pressure welding is a main method used for on-site rail welding in my country's seamless railway construction. It adopts the mixed combustion method of gas and oxygen to heat the two butt-joined rail end faces. After heating, upsetting, pushing and normalizing are carried out. After cooling, the rail welding is completed. In each process of gas pressure welding of rails, welding temperature and extrusion deformation during upsetting are key factors determining the quality of gas pressure welded joints. However, in the process of rail welding and normalizing, since there are heating devices and swinging devices next to the rail welding joints, the space is narrow, full of swinging flames, and the temperature at the joints is very high, it is almost impossible to directly measu...

Claims

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