Sheet metal casing bending processing

Sheet metal processing includes shearing, punching, milling (drilling) and deep drawing. Due to the high strength and low plasticity of sheet metal, stamping has great flexibility: it can be made into thin sheets or thick parts. The most widely used in the automotive industry is the manufacture of bending deformation parts - body panels. Let's take the production of sheet metal as an example to illustrate.

1. Cut:
According to the requirements of the drawing and the size of the product shape and size, the cutting range is determined and the material can be cut after marking and positioning. Generally, a steel plate of required length or width is divided into several sections along a straight line according to a certain width. The length of each section should be greater than the thickness of the material to be cut plus the reserved value and minus 2mm or more. If it is a thicker steel plate, the elongation of the material should also be considered, that is, it must have sufficient room for elongation before cutting.
(2) Cutting method:

1. Flat scissors method:
This method is suitable for blanking work of various profiles.

2. Oblique scissors method:
The main point of using this method is that the selection of the blade angle is related to the inclination of the workpiece surface.

3. Cutting by disc sawing machine:
Using this cutting method can complete the cutting of multiple I-beams at one time.

4. Hydraulic clamping.

2. Punching:
(1) Punching:
When it is necessary to punch out the through hole, a hydraulic press can be used to complete this process. First, fix the mold on the fixture and make the upper and lower molds close and align with the punched position. Then start the machine to lower the punch under the die and cut off the excess part on the punch. In this way, the desired hole shape can be obtained.

(3) Trimming burrs:
If there are small sharp corners or small gaps on the punched finished product, it needs to be corrected and smoothed with a file.

(4) Processing of blanking:
For some larger pipe fittings or relatively long pipes, the manipulator can be used to automatically feed the material to ensure the continuity and stability of production. In addition, different production requirements can be achieved by adjusting the stroke of the machine tool.

3. Trimming:
In order to meet the requirements of the appearance quality of the product, it is sometimes necessary to process the edge of the semi-finished product. For example, the decorative strips on the car body need to use reel-type rollers for finishing treatment.

4. Drawing:
Stretch forming is a commonly used forming technology. It is a pressure processing process that uses external force to produce permanent volume changes in metal materials at room temperature. The force applied to the green body during stretching is called stress. Normally, except for a few high-carbon alloys, most steels can withstand the cold work hardening effect under a large load without cracks.