Flame straightening method of bogie frame of high speed train
A high-speed EMU and flame rectification technology, which is applied in the direction of heat treatment process control, furnace and furnace type, etc., can solve the problems of inaccurate process, large randomness, and unscientific control, so as to suppress precipitation, improve measurement accuracy, and improve The effect of measurement accuracy
Inactive Publication Date: 2015-04-08
JILIN UNIV
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The selection of flame heating temperature in production is often based on experience, the control is not scientific enough, the randomness is large, and
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[0020] Such as figure 1 As shown, the imported high weathering steel S355J2W is much more sensitive to the flame heating temperature than the ordinary low carbon steel S355J2. When the maximum heating temperature is 800℃, the hardness of the base metal in the flame correction zone decreases by 43%. Once the flame heating temperature is improperly selected or controlled by flame straightening, the properties of the base metal in the flame heating zone will be deteriorated, and the performance and safety of the bogie frame will be seriously reduced.
[0021] The calibration and selection of the infrared thermometer for the optimal flame heating specification parameters and cooling methods in the flame correction area of weathering steel are as follows:
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The invention relates to a flame straightening method of a bogie frame of a high speed train. The method comprises the following steps: calibrating an infrared thermometer according to the applied range of flame heating temperature parameters; adjusting the emissivity of the infrared thermometer according to the calibration result; positioning the infrared thermometer above a weathering steel flame straightening area; heating the flame straightening area through neutral flame of oxy-acetylene flame and monitoring the temperature of a central region of a heating area in real time through the infrared thermometer at the same time until the temperature of reaches 730 to 750 DEG C; maintaining for 3 to 5 minutes; and cooling by air. According to the method, the high-weatherability steel is straightened; the hardness and the strength of a base material in the flame straightening area are closest to those of the base material; the low-temperature impact energy of the metal in the straightening area is more than that of the base material, and the impact energy AKV is up to 200J under the test temperature of -40 DEG C, and is 2.5 times that of a test specimen prepared from the same material under the maximum heating temperature controlled to be 600 to 650 DEG C in the straightening area.
Description
technical field [0001] The invention belongs to the technical field of manufacturing bogie frames of high-speed train sets, and relates to a method for flame rectification of a welded frame of a high-speed train set bogie. Background technique [0002] At present, the weathering steel bogie frames of high-speed EMUs generally use mechanical methods to correct welding residual deformation, and the use of flame correction technology is limited. The fundamental reason is that the hot-rolled weather-resistant steel plate selected for the welding frame of the bogie of the high-speed EMU contains certain alloy components, such as copper, phosphorus, chromium, nickel, etc., which makes the sensitivity of this type of steel to flame heating significantly higher than that of ordinary low-carbon steel. steel. At present, the understanding of flame rectification in production is relatively superficial, the control of flame heating temperature is relatively rough, and the selection of ...
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Inventor 殷世强白志范李贵忠李洪梅
Owner JILIN UNIV
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