Category of press stamping process
Tandem process
- Several presses are laid out in tandem arrangement and one production line is composed.
- Similar to a transfer process, each stage is equipped with an independent die. Normally, an operator places a product each time.
Sometimes robots or other carrier devices are used to feed products automatically.
- This process is fit for low volume production or a short process. Because of each press standing alone, flexible production is allowed.
Progressive process
- All processes are assembled in a die and this is set up in a progressive press. Coil material is fed from one end of the press and
the parts are stamped from one stage to the next leaving a certain amount of material.
- A coil feeder is needed, but a complicated transferring mechanism is not required as with the transfer press. This allows a higher efficiency in production.
- However, when parts are separated from the material, miss-match allowable is left.
- This sometimes causes an ill effect on the function of the parts such as fatigue endurance. Thus, the die needs to be set up carefully.
Transfer process
- Carrier and fingers at each stage allows products to be transferred from one die to another in a press.
- There are two types of fingers. One is 2 axis feed (X and Y) that moves horizontally and the other is 3 axis feed (X, Y, and Z) that moves in three dimensions.
