correct
The steel will be deformed during storage, transportation, hoisting and processing. The steel and components that do not meet the technical standards must be corrected. The correction of steel structure is to force the steel to deform by external force or heating action, so that the steel or components to meet the technical standard requirements of the flat or geometric shape.
Methods of correction: flame correction (also known as thermal correction), mechanical correction and manual correction (also known as cold correction).
• flame correction
The local heating of steel by flame, the compression plastic deformation of the heated metal due to the blocked expansion, and the shortening of the longer metal fiber after cooling.
Factors affecting the correction effect: flame heating position, heating form, heating temperature.
Flame correction heating temperature: 600 ~ 8000C for low carbon steel and ordinary low alloy steel.
Mechanical correction
Through the use of special straightening machine bending steel in the external force under the action of excessive plastic deformation, in order to achieve the purpose of flatness.
Drawing machine correction: used for sheet distortion, section steel distortion, steel pipe, strip steel, wire rod correction.
Press straightening: used for straightening sheet, steel pipe and section steel.
Multi-roll straightening machine: used for straightening profiles, plates, etc.
Manual correction
Using the method of hammering, the operation is simple and flexible. Due to small correction force, labor intensity, low efficiency and used for correction of small size of steel, or correction equipment is not easy to use when used.
Edge processing
Edge machining includes: to eliminate edge hardening caused by cutting and planing board edge 2 ~ 4mm; The edge of steel plate is planed into groove to ensure the quality of welding seam. To ensure the accuracy of assembly and the transmission of pressure, the steel plate is planed or milled flat.
Edge processing methods are: shovel edge, planer edge, milling edge and carbon arc air planer edge.
(1) shovel edge: there are two kinds of manual shovel edge and mechanical shovel edge. The vertical error of edges and corners after edge shoveling shall not exceed 1/3000 of the chord length and shall not be greater than 2mm.
(2) planer edge: the use of equipment is planer edge machine. Planer edge processing has planer straight side and planer bevel two kinds. General machining allowance for planing is 2 ~ 4mm.
Milling edge: the use of equipment is milling edge machine, high efficiency, less energy consumption.
(4) carbon arc air plane: the equipment used is air plane gun. High efficiency, no noise, flexible and convenient.
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