A device and method for correcting C-shaped steel castings

Abstract

The invention relates to the large steel casting straightening and shaping technology, in particular to a device and method for straightening a C-type steel casting. The device for straightening the C-type steel casting comprises the C-type steel casting to be straightened. The C-type steel casting is horizontally arranged on a steel plate with the thickness larger than 20 mm. C-shaped openings of the C-type steel casting are flush with the outer edge in the side length direction of the steel plate in direction, the inner side of one end of each C-shaped opening of the C-type steel casting is welded and fixed to the surface of the steel plate, the other end of each C-shaped opening is a free end, a screw jack is arranged at the portion, between the C-shaped openings, of the steel plate, the jack head of the screw jack abuts against the inner side of the free end of the C-type steel casting, a check block for abutting against the jack is fixed to the portion, on the outer side of the other end of the jack, of the steel plate, and the arc top of the inner side of the C-shaped steel casting is provided with an arc-shaped preheating pipe for heating the steel casting. When the device is used for straightening the large C-type steel casting, the steel casting straightening and shaping process can be simplified, the cost of the casting is reduced, and the straightening and shaping efficiency, safety and reliability are improved.

Description

Technical field [0001] The invention relates to a correction and shaping technology for large steel castings, in particular to a device and a method for correcting C-shaped steel castings. Background technique [0002] The material of large-scale thick-walled rotary high-strength steel castings belongs to medium-high-carbon low-alloy steel. The materials mainly include the following quality components C: 0.30~0.35, Si≤0.6, Mn: 0.6~1.0, P≤0.025, S≤0.020, Ni≤0.4, Cr: 1.4~1.7, Mo: 0.15~0.35. The diameter of the casting is generally 5-6m, and it is divided into two halves. The single half steel casting is C-shaped, with a maximum wall thickness of 200mm, a minimum wall thickness of 50mm, and a single half weight of 5t. The required final mechanical properties are: tensile strength Rm≥770MPa, yield strength Rp0.2≥525MPa, elongation ≥10%, section reduction ≥35%, body hardness 223~300HB, and room temperature impact toughness AKV≥27J. From the perspective of mechanical properties, it b...

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Problems solved by technology

[0006] The invention aims at the deficiencies in the deformation correction technology of steel castings in the prior art, and provides a device for correcting C-shaped steel castings, which is used for the correction of large thick-walled rotary steel castings, so as to simplify the correction and shaping process of steel castings , reduce the cost of castings, and improve the efficiency and safety of orthodontic plastic surgery

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