HIGH PRESSURE DIE CASTING PARAMETER CALCULATION ALUMINUM ALLOY

PARAMETER CALCULATION IN HPDC

THERE ARE THREE PHASES IN HPDC MACHINES

1 FIRST PHASE :- Slow speed

2 SECOND PHASE :- High Speed

3 THIRD PHASE :- Intensification Pressure or Casting Pressure.

                                                                                                         pouring hole

Distributor Length / Active sleeve length

                                Biscuit  3rd phase     2nd phase            1st phase    Plunger/shot

1 FIRST PHASE :- Slow speed

It is the distance start from plunger starting position to the distance traveled by plunger by which metal reached at cavity gate area.

     

2 SECOND PHASE :- High SpeedIt is the Distance traveled by plunger in which casting filled in cavity.In this distance plunger traveled with its high speed of the stroke.
How to calculate that travelling distance of plunger that filled the alloy in cavity.

velocity

Distance  + Biscuit thickness mm

The minimum velocity that will generate atomized flow is roughly
defined by the formula:
[Gv]1.7 x [gate thickness] x [weight density (r)] > 750
This says the minimum Gv (gate velocity) will be defined by the gate thickness
and Gv to the 1.7 power. Thus a thinner gate will require a higher
velocity to maintain atomized flow.
The maximum Gv will be determined by the onset of erosion and soldering
in the die, and the velocity where this occurs for a particular situation
should be a judgment of the gate designer. This judgment includes
consideration of the type of cast material, the type of die material, shape of
the cavity, and the fill time.