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MIG Welding - Gas Metal Arc Welding (GMAW)
TIG Welding - Gas Tungsten Arc Welding (GTAW)
Stick Welding - Shielded Metal Arc Welding (SMAW)
Metal Bending is a process by which metal can be deformed when a force is applied to an object, which causes it to bend at an angle and form the desired shape, which usually results in its "V" or "U" shape. Bending machine is a tool used to bend metal plates. It uses punches and dies to do this. Welcome to contact us-a preferred metal bending factory to know more from China.
1. Three points bending.
The punch presses the workpiece into the die without pressing it against the die wall. During the downward movement of the punch core, the workpiece edge bends upward and forms an included angle.
2. Bottom Bending
The upper die completely presses the workpiece into the female die, so there is no gap between the female die and the workpiece. This process is called clamping. The upper die and the female die must fit each other accurately. Therefore, each included angle and shape requires a corresponding mold assembly. Once the workpiece is fully pressed in, the upper die cannot continue to move downward. The machine tool control system continues to raise the punching force until the desired value is reached. The pressure applied to the workpiece thus rises and deform the workpiece in to the shape of upper and female die. In the end, the included angle is gradually stabilized under high pressure.
3. Coining
Coining is a quite basic type of metal bending. It offers great accuracy and consistency, and only requires simple machine. However, compared with other two methods mentioned above, the executed machine need to be of especially large tonnage， even more than 50 times larger. Because of this, coining is not a very commonly used method in metalworking industry.
1. Improper material selected.
The raw materials have poor deformability, high hardness and brittleness.
2. Excessive friction.
Before the metal bending, lubricating measure should be adopted according actual needs.
3. Fillet of die is too small.
Fillet directly decides the radius of the bending, which is usually determined according to the thickness of the material. If the material is too thick and the fillet is too small, cracks are easy to occur.
