What are the steps in sheet metal processing?

I. Core Steps in Sheet Metal Processing
Sheet metal processing involves converting sheet metal into desired parts through a series of processes. It is widely used in the automotive, electronics, and construction industries. Its core steps include:

1. Design and Drawing

- Use CAD software to create 2D/3D drawings, specifying dimensions, bend lines, and tolerances (usually within ±0.1mm).

- Consider material thickness (typically 0.5-6mm) and bend radius (generally 1-2 times the sheet thickness) to avoid cracking.

2. Material Cutting

- Laser Cutting: Accuracy of ±0.05mm, suitable for complex contours, with a stainless steel cutting speed of approximately 10-20 m/min (data source: TRUMPF Laser Technology Manual).

- Stamping: Suitable for mass production, with a die life of over 500,000 cycles.

- Plasma Cutting: Suitable for thicker sheets (6-30mm), but with lower accuracy (±1mm).

3. Bending

- Use a CNC press brake (such as a Swiss Gema model) and apply pressure to the die. The bending angle tolerance must be controlled within ±0.5°.

- Calculate the unfolded dimensions to avoid springback (for example, the springback angle for 304 stainless steel is approximately 2-3°).

4. Welding and Assembly

- Argon arc welding: Suitable for stainless steel/aluminum, achieving weld strength exceeding 90% of the parent material.

- Spot welding: Highly efficient, capable of completing 20-30 welds per minute.

5. Surface Treatment

- Spraying: Epoxy resin coating thickness approximately 60-80μm, salt spray resistance tested for over 500 hours.

- Electroplating: Galvanized coating thickness 5-15μm, increasing rust protection life by 3-5 times.

II. Modern Technology and Industry Trends
1. Automation Upgrade: Robotic bending cells can increase efficiency by 40% and reduce manual intervention by 70% (ABB Industrial Robotics Report).

2. Green Processing: Water-based cleaning agents replace chemical degreasing, reducing VOC emissions by 90%.

3. Combined Processing: Laser cutting and bending machines (such as the Amada EML series) reduce process time by 50%.

In summary: Sheet metal processing must strictly adhere to the logical chain of design-cutting-forming-assembly, while incorporating new materials (such as high-strength steel) and intelligent equipment to achieve high-quality and efficient production.