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Manual folding machine：
This series of manual folding machines is developed on the basis of summarizing the production and use of manual folding machines for many years. It integrates the advantages of various manual edge folding machines. A box or plate with four sides and one bottom. Moreover, a flange can also be folded on the upper part of the box. When all the upper dies are installed, the straight sheet can be folded.

Mechanical folding machine：
An edge folding machine is a machine that processes the edge of the product. For example, a lithium-ion power battery automatic folding, packaging and folding machine adopts a multi-station rotating cycle method. The lithium-ion power battery is folded and packaged through three stations. , has the characteristics of low cost, stable performance, high degree of automation, and convenient adjustment.

An edge folding machine is a machine that processes the edge of the product. For example, a lithium-ion power battery automatic folding, packaging, and folding machine adopts a multi-station rotating cycle method. The lithium-ion power battery is folded and packaged through three stations. , has the characteristics of low cost, stable performance, high degree of automation, and convenient adjustment.

The folding machine is a simple bending machine, which can be either manual or motorized. The easiest way to do this is to use a model with a bending radius to hold the steel plate firmly on the machine table. The protruding part of the material is placed on another table that can be rotated around the center of the bend radius. As the movable table rises, it bends the stainless steel to the desired angle. The stainless steel slides on the table when the bend is made. Therefore, to prevent scratching the stainless steel, the surface of the workbench must be smooth. In actual processing, the stainless steel surface is usually protected with a plastic film.

What Is Galvanealed Steel?
Galvanised steel is a steel surface that's received a galvanized coating that has been annealed, which is a process of heating and allowing to cool slowly, to make it easy to paint.

How does the Steel Get Shaped?
Next the steel doors go through a process called Shearing. This process cuts the sheet metal to the specified size needed for manufacturing.

Spot Welding The Metal Doors
One of the most important parts of the metal door manufacturing process is called Spot welding. Spot Welding is used to attach hinge, closer and lock reinforcements within the body of the door, as well as securing any additional stiffeners.

After the steel shell is assembled, a core is then added to the door. The core is used not only to provide a more rigid door, but also allows for additional features such as energy efficient door insulation, bullet resistance and sound proofing. There are three types of door cores: Honey Comb core, the steel stiffened core, and finally the polystyrene core. While in past the honeycomb core was most popular, environmental efficiency in modern buildings has demanded that a polystyrene core door become an industry standard.

Finishing The Door With Some Edge Welding
Finally, after all the components of the door are assembled, the metal door is then placed through a machine called an edge welder. This automatic welder merges both of the edges of the two door halves into one finished product.

The next step is to move the door into the finishing room. Here workers grind the edges of the weld down to a smooth finish, and make any finishing touches by sanding imperfections and stains. The door is then inspected one last time for quality before being mounted to hangars and entering the painting booth.