Figure 11.6.1: Buhler die-casting machine
|
Parameter
|
Value
|
|
Slow
shot plunger velocity
|
0.26
– 0.50 m/sec
|
|
Fast
shot plunger velocity
|
4.0
m/sec
|
|
Intensification
pressure
|
920
bar
|
|
Solidification
time
|
12
seconds
|
Table 11.6.1: Casting parameters used generate the shot curve shown in Figure 11.6.2
Figure 11.6.2: Example of a shot curve from a die-cast copper rotor (process parameters used to produce the rotor are listed in Table 11.6.1)
Although the level of process monitoring described here is not necessary for the production of die-cast copper rotors, it obviously provides valuable information to the die-casting engineer during initial set-up of the process, and to ensure that the process remains in control during commercial production. If older die-casting machines are being used that don't have such process monitoring, retrofit systems can be used from companies such as Visi-Trak. The Visi-Trak True-Trak 2020TM monitoring system features a high-speed data collection system that records injection data from position and velocity sensors. In addition, the Visi-Trak Sure-Trak2TM shot control system can be used to replace the valves and control systems on older machines, to provide real time control of the injection process.
Contact information for Visi-Trak is listed in Table 11.6.2.
Table 11.6.2: Contact information for Visi-Trak
