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What are sheet metal parts? Sheet metal parts are for sheet metal (usually less than 6mm) a comprehensive cold working process, including shearing, punching/cutting/compounding, folding, welding, riveting, splicing, moulding, and making parts
Features:
Uniform thickness. For a part, the thickness of all parts are the same
Light weight, high strength, conductive, low cost, large-scale mass production of good performance
shear process equipment is a shearing machine, a sheet of metal can be cut into basic shapes.
Advantages: low processing costs
Disadvantages: general accuracy, cutting burrs, cutting a single shape are simple rectangular or other simple graphics composed of straight lines.
Cutting process before the parts must be calculated to expand the size of the size of the unfolding with the bending radius, bending angle, sheet material, sheet thickness are related.
The equipment of punching process is punching machine, which can further process the sheared material into shape. Punching various shapes requires different moulds, common moulds are round hole, oblong hole, tab with high precision.
Bump: The material is not removed, note that there is a limit to the height of the bump, which is related to the material of the plate, the thickness of the plate, and the angle of the bevelled surface of the bump.
There are many kinds of tabs, including heat dissipation holes, mounting holes and so on. Due to the influence of bending, the distance between the edge of the design hole and the edge of the plate and the bending edge will be limited
Processing equipment: laser cutting machine
For the removal of materials that can not be completed by shearing or punching process, or hardness of the plate is easy to damage the mold, such as chamfering, or there is no ready-made mold to stamping the required shape, you can use the laser cutting to complete the bending of the material before the molding
Advantages: no burrs, high precision cutting, and can cut the material. Advantages: burr-free cutting, high precision, can cut any graphics, such as leaves, flowers, etc.; Disadvantages: high process costs
Processing equipment: press brake and panel bender
They can fold or roll sheet metal into the desired shape, is the parts of the moulding process; through the panel bender bending machine on the upper knife and the lower knife on the sheet metal cold pressure to make it deformation, get the desired shape of the process is called bending.
Bending is the last step in the forming of sheet metal parts, whether the parts can be unfolded and bending moulding need to pay attention to a few points, the following small and you say.
Lack of material：as shown below, the camber is too high, more than the ductility of the material, the camber is generally used to cushion the installation dimensions or to avoid the installation of the conflict, so the camber must be made without changing the internal structure of the material, without affecting the structural strength of the case. For example, a tab with a taper and datum at an angle of 45° and a height of 3 times the thickness of the plate.
Redundant materials: redundant materials are commonly found in multiple bending edge closure, mostly due to process errors or mapping errors
Bending limitations: most bending machines have certain limitations on bending
Unilateral height: depends on the size of the panel bender bending machine and the height of the upper cutter, the solution can be to use a multilateral large-angle bending
Dual height: not greater than the maximum height of a single side, in addition to all the limitations of a single side of the height of the bottom side of the limitations: bending height < bottom side
As sheet metal parts are formed by a sheet of metal through bending, the contact of the bending edge is not sealed no hard connection, if not dealt with will affect the strength, usually deal with the welding, drawings on the technical requirements of the contents of the: welded corners, welded corners, trimming rounded.
Surface treatment：As the sheet metal parts of the plate is thin, not suitable for hot-dip galvanizing, common surface treatment: phosphating, electrostatic spraying, colour with the project, this process applies to the plate material for the surface of the black parts not to do processing
