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Core rod heat uniformizing technological method and device thereof

A process method and mandrel technology, applied in the direction of manufacturing tools, metal processing equipment, metal rolling, etc., can solve the problem of uneven wall thickness of steel pipes, achieve the effects of protecting the environment, facilitating temperature control, and simple structure

Active Publication Date: 2018-11-16
JIANGSU CHANGBAO PLS STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a process method for mandrel soaking, which can soak the mandrel in the service length range to achieve temperature uniformity in the mandrel's entire service length range, and the temperature difference between the head and the tail is ≤ 30°C , which effectively solves the problem of uneven wall thickness of the steel pipe caused by the uneven temperature of the mandrel in the prior art

Method used

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  • Core rod heat uniformizing technological method and device thereof
  • Core rod heat uniformizing technological method and device thereof
  • Core rod heat uniformizing technological method and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The process method of the mandrel soaking heat described in the present embodiment, the steps are as follows:

[0068] (1) Transfer the mandrel obtained after the last rolling and stripping to the front roller table of the drive roller 3, and send the mandrel into the soaking device through the material hook 4; the average of the mandrel The temperature T is 500°C, the use length of the mandrel is 10m, and the temperatures of the mandrel from the head to the tail of the use length are 0-3m, 560-520°C; 3-6m, 520-500°C; 6 -7m, 500-480°C; 7-10m, 480-410°C;

[0069] (2) Open the burner with a length of 7m-10m corresponding to the mandrel, and adjust the opening size of the burner at 9m-10m to 15%, and the opening size of the burner at 7m-8m to 12%; the burner is through natural gas Combustion ejects a flame with a temperature of 1300-1400°C;

[0070] (3) Adjust the ambient temperature in the furnace body 1 to 400°C, correspondingly use a mandrel with a length of 0m-5m to ...

Embodiment 2

[0074] The process method of the mandrel soaking heat described in the present embodiment, the steps are as follows:

[0075] (1) Transfer the mandrel obtained after the last rolling and stripping to the front roller table of the drive roller 3, and send the mandrel into the soaking device through the material hook 4; the average of the mandrel The temperature T is 450°C, the use length of the mandrel is 15m, and the temperatures of the mandrel from the head to the tail of the use length are 0-3m, 520-500°C; 3-6m, 500-480°C; 6 -7m, 480-460°C; 7-8m, 460-440°C, 8-10m, 440-430°C; 10-12m, 430-405°C; 12-15m, 405-380°C;

[0076] (2) Open the burner with a length of 8m-15m corresponding to the mandrel, and adjust the opening size of the burner at 12m-15m to 16%, and the opening size of the burner at 8m-11m to 13%; the burner is through natural gas Combustion ejects a flame with a temperature of 1300-1400°C;

[0077] (3) Adjust the ambient temperature in the furnace body 1 to 450°C,...

Embodiment 3

[0081] The process method of the mandrel soaking heat described in the present embodiment, the steps are as follows:

[0082] (1) Transfer the mandrel obtained after the last rolling and stripping to the front roller table of the drive roller 3, and send the mandrel into the soaking device through the material hook 4; the average of the mandrel The temperature T is 550°C, the use length of the mandrel is 8m, and the temperatures of the mandrel from the head to the tail of the use length are 0-2m, 600-585°C; 2-4m, 585-560°C; 4 -6m, 560-530°C; 6-8m, 530-510°C);

[0083] (2) Open the burner with a length of 6m-8m corresponding to the mandrel, and adjust the opening size of the burner at 7-8m to 13%, and the opening size of the 6m burner to 10%; A flame with a temperature of 1300-1400°C;

[0084] (3) Adjust the ambient temperature in the furnace body 1 to 350°C, corresponding to the use of mandrels with a length of 0m-5m for heat exchange with the environment of the furnace body...

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Abstract

The invention relates to the technical field of core rod heat uniformizing, in particular to a core rod heat uniformizing technological method and a device thereof. The core rod heat uniformizing technological method comprises the following step that after a core rod is removed, temperature compensation is conducted on the section with the temperature being less than the average temperature T of the core rod, and cooling is conducted on the section with the temperature being greater than the average temperature T of the core rod. According to the core rod heat uniformizing technological method, through the modes that temperature compensation is conducted on the low-temperature section, cooling is conducted on the high-temperature section, and heat preservation is conducted on the positionwith the proper temperature, the heat uniformizing effect on the core rod is achieved, thus in the whole use length range, the temperature difference is less than or equal to 30 DEG C, the uniformityof the temperature of the core rod in the full use length range is ensured, and the problems of the uneven wall thickness of steel pipe products and uneven abrasion of core rods due to the uneven temperature of the core rods in the continuous rolling process can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of soaking mandrel rods, in particular to a process method and device for soaking mandrel rods. Background technique [0002] The mandrel is an important tool and mold for the pipe jacking unit to participate in the deformation of the steel pipe, and its consumption is relatively large, and the quality and cost of the mandrel are directly related to the quality and benefit of steel pipe production. Among them, in the production process, the temperature uniformity of the mandrel directly affects the uniformity of the longitudinal wall thickness of the steel pipe and the wear uniformity of the mandrel itself. For example, the surface temperature of the mandrel is not uniform, resulting in uneven temperature of the inner wall of the steel pipe, inconsistent plastic deformation and slip of the metal, resulting in local thinner wall thickness and steel pipe defects. [0003] The current soaking method of the man...

Claims

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Application Information

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IPC IPC(8): B21B25/00
CPCB21B25/00
Inventor 於宝祥王国富汪龙沈汉钢王纯凯
Owner JIANGSU CHANGBAO PLS STEEL TUBE
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