About Sheet metal fabrication process

China sheet metal fabrication services

Table of Contents

Cutting material:

According to the unfolded graphics of the product design, use equipment or molds to cut the metal sheet, and pre-produce the required material size, which is helpful for the next sheet metal bending, deep drawing, sheet metal stamping and other sheet metal Forming work.
Different cutting methods can be reasonably selected according to different materials, product requirements and quantity conditions. include:

Laser cutting: Fast and efficient cutting of thin metal plates by laser beam, with flat cross section and no shape restrictions, suitable for large sheet metal parts, or cutting of complex shapes, but not suitable for high-thickness plates.

Water jet cutting: suitable for thick metal plates, it can accurately cut complex shapes and neat sections, but the efficiency is low and the cost is high.

Plasma cutting: suitable for cutting metal plates with a thickness of 10mm-50mm, it cannot be accurate, the section is not neat, and requires precision machining.

Die blanking: It is suitable for cutting small-sized parts, and the metal die is used to cut the sheet into different shapes, but due to the limitation of the external shape, it is impossible to blank complex geometric figures. Need to invest in higher mold cost,

Cnc Punching: Usually, circular, square and other graphics are created on the metal plate, and the shape of the mold is quickly applied to the metal plate through CNC punching equipment to form perforations. A uniform pattern suitable for large batches.


The sheet metal is bent according to the bending line marked on the product design drawing, so that the metal sheet can form a specific angle and create a three-dimensional product structure.

It is worth noting that the thickness of the material needs to be considered for bending, and the corresponding bending tools and molds should be selected reasonably. The R angle at the bending point needs to correspond to the thickness and bending angle of the product, so as to avoid material breakage due to excessive bending processing. affect product quality.


Combining metal bending parts with standard or non-standard fasteners is a low-cost assembly method that saves a lot of labor costs compared to welding.
According to the needs of different functions, a variety of riveting methods can be selected, such as pressure riveting nuts, blind rivets, pressure riveting studs and so on.

Welding :

The types of welding are divided into: argon arc welding, spot welding, carbon dioxide shielded welding, manual arc welding, etc. Before welding, the thickness and position of the material should be considered to prevent deformation caused by overheating during welding, and use high-quality fixed tooling to ensure The parts will not shift during the welding process. 

Surface treatment :

According to the application environment requirements of different products, it is necessary to carry out different chemical or physical surface treatments on the surface of the products to change the surface strength, corrosion resistance, electrical conductivity and heat resistance of metal materials, as well as appearance aesthetics. Usually divided into: electroplating, powder coating, painting, oxidation, etc.

It is worth mentioning that all products must be subjected to chemical treatment such as sandblasting, pickling, and phosphating before surface spraying to remove oil stains and impurities on the surface, which can present a better surface effect.

Quality inspection :

The quality control of sheet metal parts requires a strict management process. Compared with stamping, casting and other mold forming processes, the proportion of quality risks caused by human errors in sheet metal forming is relatively high, and high-frequency sampling and inspections are required.

  • Drawing control.
  • Size detection.
  • Geometric tolerance detection.
  • External coating detection.

The processing steps of the parts processed in the sheet metal workshop are: product preliminary test, product processing trial production and product batch production. In the process of product processing and trial production, it is necessary to communicate with customers in a timely manner and obtain the corresponding processing evaluation before mass production of products.

At Supro MFG, we utilize laser cutting technology for low-volume sheet metal parts manufacturing projects to help customers reduce investment costs for expensive tooling.

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