Steel structure processing technology
1. Lofting and marking
1) layout
The first working procedure in the process of making steel structure is to draw the solid drawing of the product or parts or parts on the lofting table or flat plate according to the shape and size required by the detailed construction drawing of the product or the drawing of parts or parts, to obtain the solid length and make the sample.
Content: check the mounting size and hole spacing of the drawing; The nodes are released at the size of 1:1. Check the size of each part; Make sample and sample bar as blanking, bending, milling, planing, drilling and other processing basis.
Use 0.50 ~ 0.75mm iron sheet or plastic sheet to make the sample. Use wood pole, steel sheet or flat iron to make the sample. When the length is short, use wood ruler. Samples and samples shall be properly kept until the end of the project before destruction.
Machining allowance 3 ~ 5mm(welding shrinkage, cutting, milling end), allowable deviation 1mm.
At present, most manufacturers use numerical control technology for lofting and marking
2) marking (marking)
According to the sample drawing on the steel components of the actual sample, and hit a variety of processing marks for the steel cutting preparation.
Job description: checking and verifying materials; Cutting, milling, planing, bending, drilling and other processing positions shall be marked on the material, and punching shall be made, and the part number shall be marked.
2. Cutting (cutting)
Cutting is to separate the part shape of lofting and marking from the raw material. Commonly used cutting methods are: gas cutting, mechanical cutting (cutting, sawing) and plasma cutting three methods.
Gas cutting
The preheating flame generated by the mixture of oxygen and combustible gas is used to heat the metal surface to the combustion temperature and make the metal undergo violent oxidation. A large amount of heat is released to make the underlying metal burn by itself. At the same time, a high-pressure oxygen jet is used to blow away the oxide and form a narrow and neat slit.
Gas cutting equipment flexible, low cost, high precision, can cut all kinds of thickness of steel, especially with the curve of the parts or thick steel plate, is the most widely used cutting method.
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