Hold Pressure Vibration Control
1. H.P.V. Control (PAT.) --- For thick-wall molding
Purpose of development
H.P.V. Control technology was developed to reduce motor load in order to keep a certain level of hold pressure for a long time by continuous movements (vibration) of balls.
Advantage of H.P.V. Control
1. Oil layer formed around balls improves mechanical efficiency and reduces motor load.
Balls repeats clock wise and counter crock wise rotations.
2. Long-time hold pressure
Comparison of injection motors with 180 MPa load applied.
"No H. P. V. Control"
"With H. P. V. Control"
50% longer hold pressure time
3. Pressure control is more controllable and stable by better mechanical efficiency.
・With H. P. V. Control, pressure is stable with small change.
・Without H. P. V. Control, pressure change is larger showing irregular amplitude.
Molding example 1: 50mm-cube
MD130S6000 LP 40mm screw, material PMMA
Flatness of product surface is checked visually by reflection of fluorescent light bulb on ceiling. Reflection image of on the cube shows straight light bulb.
When low speed control and/or long-time hold pressure control fail, problems such as uneven surface, imperfect transfer, bubble and flow marks occur