How the Drawing Process Works
Demsey Manufacturing Co., Inc custom builds, in-house, all tooling required for each job. If you have already purchased tooling elsewhere, a substantial percentage of it may be utilized on Demsey equipment. Saving money for you while producing your job effectively and efficiently is a high priority at Demsey Manufacturing.
Learn how the tooling works in the deep drawn stamping process:
The Cup Operation
The cup operation takes the flat metal disk produced in the blanking stage and performs the first diameter reduction on it. A hold-down sleeve applies pressure to the blank to prevent wrinkling, and then the draw punch pushes down on the blank and forces it into the die. Finally, a knock-up pin ejects the cup, and the transfer slide takes it to the next operation. Because the resulting part is isolated, it can be moved to succeeding stations for deeper draws.
The Deep-Draw Process
- Cup Operation: Converts the flat blank to tubular form that resembles a cup.
- First Draw: Reduces the diameter of the cup.
- Second Draw: Further reduces the diameter of the cup and lengthens the part.
- Final Draw: Brings the part to the desired outside and inside dimensions.
- Pierce: The bottom of the tubular component is punched out and the slug is extracted.
- Clip: The uneven edge is removed and the finished part is ejected.
Side Pierce Operation
Normally, punches do the job of pushing parts into the die. But the eyelet transfer process is flexible enough to allow for a wide variety of secondary operations to be considered right in the machine. In this example, the part is pushed up from the die bed onto an arbor. Two air-driven punches pierce slots in the part. The slugs are vacuum extracted up through a hole in the support.