1. Core Processes of Sheet Metal Fabrication
Sheet metal fabrication involves cutting, bending, welding, and other operations on sheet metal to create the desired parts. The main processes can be divided into the following:
1. Blanking: Cutting the sheet metal into the desired shape. Common methods include laser cutting (with an accuracy of ±0.1mm), stamping (suitable for mass production), and plasma cutting (suitable for thick plates). For example, automotive sheet metal parts are often cut using lasers, with a speed of over 10 meters per minute (source: Sheet Metal Fabrication Technology Manual).
2. Forming: Forming the sheet metal into a three-dimensional structure through processes such as bending and stretching. Press brakes are key equipment, and modern CNC press brakes can achieve an angular accuracy of ±0.5°. Complex curved surfaces require hydroforming, such as in aircraft skin processing.
3. Welding: Joining multiple components into a single piece. Common methods include spot welding (accounting for 60% of the automotive industry), argon arc welding (used for precision stainless steel parts), and laser welding (weld width can be controlled within 0.2mm).
4. Surface treatment: Improving corrosion resistance or aesthetics. These include spray coating (thickness 50-100μm), electroplating (galvanized layer approximately 5-20μm), and anodizing (commonly used for aluminum alloys).
II. Extended Technologies and Industry Trends
1. Automation Upgrades: Robotic bending cells can increase production efficiency by 30%. For example, ABB's IRB 6700 series can operate 24/7.
2. Composite Processing: Integrated laser cutting and stamping equipment (such as the TRUMPF TruPunch) can reduce process transfer time and labor costs.
3. Green Manufacturing: Water-soluble coatings replace traditional paints, reducing VOC emissions by 90% (EU ELV regulations require).