Heat treatment of large-circular piece welling heat-treating furnace and wind-forced generating tower drum flange

A technology of heat treatment furnace and piece well type, which is applied in the direction of heat treatment furnace, heat treatment equipment, heat treatment process control, etc., can solve the problems of uneven heating, unsafe and reliable, high energy consumption, etc., achieve safe and reliable service life, and improve production qualification rate , the effect of accurate temperature control

Active Publication Date: 2007-11-21
兰鹏光
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problems of uneven heating, large workpiece deformation, high energy consumption, short service life and unsafe reliability caused by the use of existing heat treatment furnaces for large ring parts and the existing method for large ring parts such as wind power towers Due to the problem that the product does not meet the special requirements for anti-cold brittleness due to blue heat treatment, a large ring-shaped well-type heat treatment furnace is provided, and a wind power tower flange realized by using the above-mentioned large-scale ring-shaped well-type heat treatment furnace heat treatment process

Method used

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  • Heat treatment of large-circular piece welling heat-treating furnace and wind-forced generating tower drum flange
  • Heat treatment of large-circular piece welling heat-treating furnace and wind-forced generating tower drum flange
  • Heat treatment of large-circular piece welling heat-treating furnace and wind-forced generating tower drum flange

Examples

Experimental program
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specific Embodiment approach

[0018] Large-scale annular well-type heat treatment furnace, including a cylindrical steel furnace body 1 made of refractory bricks as the furnace bottom and refractory fiber as the furnace lining, and an electric heater fixed on the refractory fiber lining on the inner wall of the furnace body with porcelain nails 2 (that is, resistance wire or electric heating rod), and a furnace cover 4 for closing the furnace 3 and being mounted on the top of the furnace body; an electric heater 13 is also provided in the furnace 3,

[0019] As shown in FIG. 1 , it is a schematic diagram of a large annular well-type heat treatment furnace with an electric heater installed at the bottom of the present invention. The electric heater 13 is installed in the bottom central area of ​​the furnace 3 .

[0020] As shown in Figure 2, it is a large-scale ring-shaped well-type heat treatment furnace with an electric heater installed in the middle cylinder. Refractory fibers are also hung on the outer ...

Embodiment 1

[0025] Embodiment 1: The heat treatment process of the flange of the wind power generation tower, the specific process and steps are as follows:

[0026] (1) Furnace installation: It is required that the flanges should be placed horizontally between the flanges and supported at multiple points by support blocks, with a support height of 80-100mm, which is used to prevent flange heating deformation caused by improper furnace installation;

[0027] (2) Normalizing: First, heat the flange to 600°C in the furnace and keep it for 2 hours, then heat it to 910°C and keep it for h1 minute, and calculate the perimeter S dimension according to the average diameter d of the specific part , according to h1 = 1 ~ 1.4mm / min calculation, that is: S = πd, h1 = 1.4πd (minutes), wherein; Each piece of the flange is placed separately, so that a good cooling effect can be achieved;

[0028] (3) Tempering: heat the flange to 560°C in the furnace, hold it for h2 minutes, and calculate the circumfe...

Embodiment 2

[0030] Example 2, the specific steps are the same as Example 1, the difference is (2), normalizing: first, heat the flange to 650°C in the furnace and keep it for 2 hours, then heat it to 870°C, keep it for h1 minute, and then Heat to 930°C, keep for 20 minutes, take out the furnace and air cool; 3), tempering: heat the flange to 540°C in the furnace, and keep for h2 minutes.

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Abstract

A heat-treatment furnace and method for metal work pieces are disclosed. The heat-treatment furnace is a large circular well-shaped heat-treatment furnace, and process adopts wind-forced generating tower column flange; electric heater is placed inside original hearth. The process is carried out by heating to 600-650 degree for 2 hrs, reheating at 870-910 degree for 1 min, reheating to 920-930 degree for 20 mins, taking out of furnace, air cooling, tempering, heating to 540-560 degree for 2 mins, taking out of furnace and air cooling. Wind-forced generating tower column flange's raw material is Q345E: -40 degree, AKV is between 110-130J. It has homogeneous heating, less consumption, long life and no formation.

Description

technical field [0001] The invention belongs to a metal workpiece heat treatment furnace and a heat treatment process method, in particular to a large-scale annular well-type heat treatment furnace and a wind power generation tower tube flange heat treatment process method. Background technique [0002] The wind power tower flange is a large-diameter annular part with a maximum diameter of 2 to 10 meters. Since the wind power tower is installed in different natural environments, especially in alpine regions, its mechanical performance requirements are different from ordinary For flanges, the performance requirements against cold and brittleness at low temperatures are particularly high, such as material: Q345D: -20°C, AKV≥35J; material Q345E: -40°C, AKV≥27J; and export products: Q345E: -40°C, AKV≥54J . At present, the heat treatment process commonly used for flanges is "normalizing + tempering", and the temperature used in the normalizing stage is generally 930-950°C. The m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D11/00C21D1/28
Inventor 兰鹏光王林福
Owner 兰鹏光
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