1. Coil material selection and blanking function; 2-6 kinds of coil materials with different thickness or material can be selected. This function is used to adjust the coil before processing to prevent waste.

3. Chamfering and grooving function; this function can complete the production of air duct installation hole, and avoid the inconvenience caused by later drilling. 4. Cutting function: this function separates the sheet from the coil for the next processing.

5. Transmission function, which is convenient for the coil to automatically process the next process.

6. Undercut: this function realizes the blank holder operation of sheet metal and makes joint angle. 7. Common plate flange forming; this function is the key step of making double-sided common plate flange. 8. Bending forming; after one process is completed, the common plate flange rectangular duct has been formed.