Metal fabrication is the method of producing artifacts or structures by designing, cutting, joining and assembling of raw metallic materials. This process seeks to incorporate value thereby accurate engineering drawings should be followed in order that the SMC is appealing, inside the required standards and durable. Metal fabrication is undoubtedly an art that borrows heavily on engineering principles.
Metal Fabrication Process
Step One: Design
You can find clearly defined standards (British Standards, Euro-codes etc) and legislation governing the types of all engineering equipment and structures. These standards are based on the application of raw materials for sale in a certain region in addition to environmental conditions. Fabricator are obliged to clearly define these standards and requirements to clients prior to the design and fabrication process begins. This could involve taking the design calculations sheets into a municipal engineers for approval.
Step 2: Marking Out
In SMC metal the marking out is done from the engineering drawings using the square edges or square lines around the sheet metal being used since the points of reference.
However in large-scale production templates made from wood, metal or special paper are being used depending on the number and kind of product. The cost of the templates needs to be justifiable. Care must be taken when working with form work to ensure the accuracy of their dimensions since a faulty template may lead to huge losses as the whole batch produced using it could be defective.
Step Three: Cutting
Cutting of sheet metal can be carried out by either Thermal cutting or shearing.
Thermal cutting is done by utilization of either oxy-acetylene or oxy-propane gas. Propane costs less nonetheless it requires special cutting nozzles. This technique is initiated by heating carbon steel to 850 oC resulting in an exothermic reaction which rises the temperatures further. Thermal cutting applies the key of rapid oxidation.
Shearing is usually carried out by use of a guillotine. Dependant upon the thickness of the metal sheet hand-operated or power-driven guillotine may be used.
Step 4: Forming
Bending of metal sheets is completed by utilization of folding machines that involves 3 major steps. First the content is firmly clamped, then a bottom folding beam pulled to form desired bends lastly the fabric is carefully removed from machine.
Heavy and thick metal plates are bent utilizing a Press Brake. A press brake primarily includes a bottom dye and a top tool forming a large ram press. There are 2 main types of 13dexypky brake. The up-stroking press brake which lifts the bottom tool to meet a fixed top along with the down-stroking press brake whereby the most notable tool is pushed right down to a set bottom.
Step 5: Joining
Welding is considered the most popular way of joining. For SMC metal tube arc gas shielded is considered the most preferred process. The torch is linked to a confident pole with all the source of energy being direct current (d.c). A filler wire is continuously fed with the torch because the shielding gas is handed down the project piece.
Step 6: Inspection
Once the work piece has been fully assembled it’s checked for dimensional accuracy, alignment and straightness to ensure it’s throughout the allowable limits.