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Double-frequency equipment and process for normalizing rail welding seams

A rail and normalizing technology, applied in the direction of track, track laying, track maintenance, etc., can solve the problems that cannot break through 760 ℃, normalizing equipment and process technology can not meet the requirements of new standards, etc., to achieve simple setting and solve normalizing Effects of Temperature Uniformity Problems

Inactive Publication Date: 2011-06-08
中国铁路呼和浩特局集团有限公司焊轨段
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The original normalizing equipment and technology can no longer meet the requirements of the new standard
The original technology normalizes irregularly shaped metals such as new rail types and rail types, so that the temperature at the upper end of the rail can rise to more than 1000°C according to the heating power and time extension until the top of the rail is melted, but the temperature at the bottom corner of the rail No matter how to adjust the heating power, change the heating time and change the structure of the heating coil, it is impossible to break through 760°C

Method used

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  • Double-frequency equipment and process for normalizing rail welding seams

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Effect test

Embodiment 1

[0018] Embodiment 1: A dual-frequency normalizing equipment for rail welds, which includes an intermediate frequency power supply cabinet 1 and a transformer 2, wherein the transformer 2 includes a rail weld heating coil 3 and a load transformer 4, and it also includes an AC contactor 5 , low-frequency capacitor bank 6, high-frequency capacitor bank 7, PLC automatic controller 8, PLC automatic controller 8 is connected with intermediate frequency power supply cabinet 1, high-frequency capacitor bank 7 is connected with rail weld seam heating coil 3 in parallel, low-frequency capacitor bank 6 is connected with The AC contactor 5 is connected and connected in parallel with the rail welding seam heating coil 3 .

Embodiment 2

[0019] Embodiment 2: Using the dual-frequency normalizing equipment for rail welds in Embodiment 1, the following technological operations are performed.

[0020] According to the specific rail type, such as 50kg / m rail, a rail weld dual-frequency normalizing process includes the following production steps: (1) low-frequency heating; (2) high-frequency heating;

[0021] Wherein (1) low-frequency heating: set the power and frequency of the normalizing equipment, wherein the power is 60KW, the frequency is 1100Hz-1200Hz, and the temperature is 500°C-730°C to heat the weld of the rail;

[0022] (2) The PLC automatic controller of the rail weld dual-frequency normalizing equipment detects that the temperature of the bottom corner of the rail weld reaches the preset value of 730°C in the low-frequency band. If the temperature of the bottom corner of the detected rail weld is lower than the preset value in the low-frequency band If the fixed value is 730°C, the low-frequency heating...

Embodiment 3

[0025] Embodiment 3: Using the dual-frequency normalizing equipment for rail welds in Embodiment 1, the following technological operations are performed.

[0026] According to the specific rail type, such as Baotou Steel’s U71Mn material 60kg / m rail, a dual-frequency normalizing process for rail welds includes the following production steps: (1) low-frequency heating; (2) high-frequency heating;

[0027] Wherein (1) low-frequency heating: set the power and frequency of the normalizing equipment, wherein the power is 70KW, the frequency is 1000Hz-1100Hz, and the temperature is 500°C-730°C to heat the weld of the rail;

[0028] (2) The PLC automatic controller of the rail weld dual-frequency normalizing equipment detects that the temperature of the bottom corner of the rail weld reaches the preset value of 730°C in the low-frequency band. If the temperature of the bottom corner of the detected rail weld is lower than the preset value in the low-frequency band If the fixed value ...

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Abstract

The invention discloses a double-frequency process for normalizing rail welding seams. The process comprises the following production steps: (1) low-frequency heating: setting the power and frequency of normalizing equipment to 60kW-80kW and 800Hz-1200Hz respectively, and heating rail welding seams; and (2) high-frequency heating: setting the power and frequency of the normalizing equipment to 60kW-70kW and 2000Hz-2800Hz respectively, heating the rail welding seams, and detecting whether the temperature of the rail welding seams reaches a preset value, thus completing the normalizing process. The process has the following advantages: the temperature range can be randomly adjusted according to different rail types and rail profiles, thus completely solving the uniformity problem of the normalizing temperature of the rail welding seams; and the technology can ensure special-shaped steel to be subjected to uniform heating. The highest temperature of the rail bottom angles of the rail welding seams in the normalizing process reaches 900 DEG C, so the normalizing process is suitable for normalizing the welding seams of rails with weight of 50kg / m, 60kg / m, 68kg / m and 75kg / m.

Description

Technical field: [0001] The invention relates to a double-frequency normalizing equipment and a normalizing process for a rail weld, in particular to a dual-frequency normalizing equipment and a normalizing process for a rail weld. Background technique: [0002] The earliest heat treatment of weld seam adopts the method of flame heating. Considering safety, heat treatment effect, monitoring, and operation, this method has relatively large defects and potential safety hazards. With the advancement of science and technology, the heat treatment of factory welded joints has canceled the flame normalizing method and replaced it by the medium frequency electric induction heating method. The selected frequency of the intermediate frequency power supply cabinet is about 900Hz. This frequency is also the common frequency for other heat treatment of rail products. Now all the intermediate frequency quenching manufacturers of rails and most of the welded rail manufacturers adopt this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01B31/18
Inventor 郭晋龙刘伟蔡庄厚董平禹王玉辉
Owner 中国铁路呼和浩特局集团有限公司焊轨段
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