Vacuum - Assisted Diecasting

Transcription

Multi-step Vacuum Technology for
High Pressure Die Casting (HPDC)
Vacu²
[væk.ju tu:]
A newly developed process by
Pfeiffer Vacuum GmbH
© Pfeiffer Vacuum 2007
Business Unit Systems, Volkmar Gibietz, 2007-04-24
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High Pressure Die Casting Machine
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High Pressure Die Casting Machine – Schematics
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HPDC – Sleeve and Parts
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Vacuum for HPDC
Why vacuum?
Does it always make sense?
z Classical HPDC : more then 30% to 50% enclosed air
- Nitrogen
- Compressed to small volume
z Vacuum
- when 100 mbar would be reached in the die f.e. 10%
- if something goes wrong, no air can escape
- Which pressure is realy achieved in the die ?
- How reliable and stable is the process?
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Applications in HPDC
¾ Parts with complex geometry
¾ Heat treatable castings
¾ Weldable castings
¾ Later:
“Normal parts” with better quality and higher outputs?
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Examples for valves and pistons
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Old: Standard Vacuum System
Limited area
Blocking-effect
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Limited time
No equilibrium
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Large influence
from leakage on
equilibrium
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Measurement
Pressure in the
die ???
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Processstability
???
Processcontrol
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Old: Vacuum System with metal-dosing
More time
Nearer at
reachable
equilibrium
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Limited area
Blocking-effect
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Measurement
Pressure in the
die ???
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Large
influence from
leakage on
equilibrium
Elaborate
sealing
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vulnerable
dosing system
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New: Multi-step Vacuum System
invented by Pfeiffer Vacuum (Principle)
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Smaller volumes
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Bigger Area
Equilibrium is reached in very
short time and has lower value
Less influence from leakage
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Dosing amount and
vacuum are
independent
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Process-stability:
Two steps / lower equil. Reached, 2nd
order stability
Less influence leakage
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Process-control
-Before production starts
-During production
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Results
< Normal vacuum
Multi-Step Vacuum >
Vacu²
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Results
< Normal vacuum
Multi-Step-Vacuum >
Vacu²
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Results – Comp. X-Ray
Multi-Step
Normal
Without
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First trials with Pilot Plant in the HPDC technology centre of
Test conditions:
¾ HPDC-Machine 2000 t
¾ Simple sealing in closing surface
(parting line)
¾ Second step over „piston-type vents“ with
venting surface area 2x 65 mm2
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Glühtest - Glowtest
Standard-Vakuum / Standard Vacuum
2 Stufen-Vakuum / 2-Step Vacuum
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Pfeiffer Vacuum
Versuche
Pilotanlage
04/2005
bei
Vacu2
Trials
Pilot plant
at
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Versuchsbedingungen
Test conditions
Projekt tiefes Vakuum und Legierungsentwicklung
¾ Druckgussanlage 700 t
¾ Ohne Abdichtungen in der Form
¾ Zweite Stufe über “Waschbrett-Ventil” 90 x 0.9mm
Project low vacuum and alloy-development
¾ High pressure die casting machine 700 t
¾ Without sealing in the die
¾ Second vacuum-step over “Washboard-Vent” 90 x 0.9mm
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Vergleich Mikrostruktur / Comparisson microstructure
2 Stufen-Vakuum
2 Step-Vacuum
Standardvakuum
Standardvacuum
Ohne Vakuum
Without Vacuum
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Mechanische Eigenschaften
Mechanical Properties
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Measurements – die side
good sealing
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Measurements – die side
bad sealing
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Measurements – sleeve side
bad sealing
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Measurements – 2 Step
bad sealing / poor throughput valve
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Messkurven
Produktion
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Messkurven
Produktion
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Korrelation
Prozessparameter / erreichter Enddruck (zurückgerechnet)
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Vacu² - System (patents pending)
¾
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Control Panel
¾
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Brochures / Literature
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Brochures / Literature
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Vacu² - Market Introduction
Press Release
¾
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Thank you !
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Vacuum - Assisted Diecasting

Transcription

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