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Deformation-prevention heat treatment method for large thin-wall steel casting

A heat treatment method and technology for steel castings, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve problems such as deformation and deformation of steel castings, and achieve the effect of reducing external stress

Inactive Publication Date: 2016-10-26
KOCEL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for many steel castings with complex structures such as thin-walled parts, slender rods, large openings, cantilever structures, and large differences in wall thickness, the steel castings are prone to significant deformation after heat treatment. After the heat treatment method, the steel casting is directly hoisted into the quenching medium, and special anti-deformation measures are not taken, the deformation of the steel casting is inevitable

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  • Deformation-prevention heat treatment method for large thin-wall steel casting
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Effect test

Embodiment 1

[0040] see figure 1 , for the shell casting 100 of thin-wall complex structure for coal mining machinery, the outline size of the casting is 3048×1600×864mm, the weight is 11t, the thinnest wall thickness is 25mm, and the maximum wall thickness is 80mm. When heat treatment is carried out according to the method of the present invention, the heat treatment holding time is 80mm×1~1.5min / mm=80~120min, respectively at the thickest wall thickness, the thinnest wall thickness and the middle position of the steel casting. The external temperature measuring device 11, the external temperature measuring device 13, and the external temperature measuring device 12 are installed, and the shaft hole, the large plane of the cavity, and the axis of the steel casting are not deformed after heat treatment.

Embodiment 2

[0042] see figure 2 , for high-strength large-scale thin-walled ring gear castings for mining machinery, such as the two ring gears 200, the outline size of the ring gear casting is Φ5036*400mm, the net weight of the steel casting is 17t, and the maximum wall thickness 170mm, minimum wall thickness 30mm. The contour size of another ring gear steel casting is φ9892*900mm, the net weight of the steel casting is 100t, the maximum wall thickness is 200mm, and the minimum wall thickness is 50mm. Two kinds of steel castings are molded and heat-treated in two halves, and the single-half steel casting is C-shaped, and a tie bar 20 is set at the opening of the C-shaped ring gear casting. After heat treatment is carried out according to the method of the present invention, the casting There is no opening, shrinkage and obvious warping deformation of steel parts.

[0043] According to the method provided by the present invention, carry out the casting production of deformable steel ca...

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Abstract

Disclosed is a deformation-prevention heat treatment method for a large thin-wall steel casting. The method comprises the steps of arranging a lifting and transporting tray, arranging a steel casting supporting pad, arranging external connection temperature measuring devices, and carrying out heat treatment and quenching. In the step of arranging the external connection temperature measuring devices, the three external connection temperature measuring devices are arranged at the thickest wall, the thinnest wall and the middle portion of the steel casting and are used for monitoring the temperature of the thickest wall, the thinnest wall and the middle portion of the steel casting; and through arrangement of the lifting and transporting tray and deformation-prevention tie bars, the heat treatment temperature is precisely controlled, quenching media are changed to reduce external stress, heat stress and structural stress borne by the steel casting, and finally, it is ensured that after heat treatment and quenching of the steel casting, the casting does not deform.

Description

technical field [0001] The invention relates to the technical field of casting of thin-walled steel castings, in particular to a method for anti-deformation heat treatment of large thin-walled steel castings. Background technique [0002] For large steel castings, anti-deformation is another content that needs to be paid attention to during heat treatment after anti-cracking and ensuring mechanical properties. [0003] Because once the steel casting is deformed, the size is out of tolerance, the steel casting will increase the amount of welding repair or gouging processing, and the steel casting will be scrapped if it is serious. Sometimes steel castings may recover a certain shape or size by correcting deformation, but not all steel castings can be corrected. Therefore, preventing deformation of steel castings during heat treatment is an important content to ensure the quality of steel castings. [0004] During the heat treatment process of steel castings, the superpositi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/18C21D1/60C21D11/00
CPCC21D1/18C21D1/60C21D9/0025C21D9/0068C21D11/00
Inventor 马进郭小强苏志东
Owner KOCEL STEEL
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