Metal fabrication is the method of producing artifacts or structures by designing, cutting, joining and assembling of raw metallic materials. This process seeks to include value thereby accurate engineering drawings should be followed to ensure the SMC is appealing, in the required standards and sturdy. Metal fabrication is undoubtedly an art that borrows heavily on engineering principles.
Metal Fabrication Process
Step 1: Design
There are clearly defined standards (British Standards, Euro-codes etc) and legislation governing the designs of all engineering equipment and structures. These standards are based on the usage 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 just before the design and fabrication process begins. This might involve using the design calculations sheets to a municipal engineers for approval.
Step Two: Marking Out
In SMC metal the marking out is done directly from the engineering drawings using the square edges or square lines on the sheet metal being utilized as being the points of reference.
However in large-scale production templates produced from wood, metal or special paper are utilized based on the number and kind of product. The expense of the templates should be justifiable. Care must be taken when utilizing form work to ensure the accuracy with their dimensions since a faulty template may lead to huge losses as being the whole batch produced using it would be defective.
Step 3: Cutting
Cutting of sheet metal can be done by either Thermal cutting or shearing.
Thermal cutting is performed by utilization of either oxy-acetylene or oxy-propane gas. Propane cost less however it requires special cutting nozzles. This process is initiated by heating carbon steel to 850 oC causing an exothermic reaction which rises the temperatures further. Thermal cutting applies the principle of rapid oxidation.
Shearing is generally performed by utilization of a guillotine. According to the thickness of your metal sheet hand-operated or power-driven guillotine can be utilized.
Step 4: Forming
Bending of metal sheets is performed by utilization of folding machines which involves 3 major steps. First the information is firmly clamped, then a bottom folding beam pulled to make desired bends and lastly the material is carefully taken from machine.
Heavy and thick metal plates are bent by using a Press Brake. A press brake primarily is made up of bottom dye and a top tool forming an extensive ram press. There are two main types of 13dexypky brake. The up-stroking press brake which lifts the bottom tool to satisfy a fixed top along with the down-stroking press brake whereby the top tool is pushed as a result of a set bottom.
Step 5: Joining
Welding is considered the most commonly used technique for joining. For SMC metal tube arc gas shielded is regarded as the preferred process. The torch is attached to a positive pole using the power source being direct current (d.c). A filler wire is continuously fed throughout the torch as being the shielding gas is handed down the project piece.
Step 6: Inspection
As soon as the work piece has become fully assembled it’s checked for dimensional accuracy, alignment and straightness to make sure it’s within the allowable limits.