Eco+
The further development of resource-saving, highly efficient technologies is a defining issue in the die casting industry. Wollin sets a milestone with the development of the patented Eco+ micro-spray technology.
EcoSpray essentially works with two developments:
- Application technology for reproducible small quantities
- Improved release agents (oil/water-based) that also work at higher temperatures, up to 400°C
The use of oil- or water-based concentrates, combined with our Eco+ micro-spray technology, offers:
- Economic advantages
- Ecological advantages
- Production advantages
For release agent
- Very low mixing ratio 1:1 - 1:10, or purely oil-based release agents
- Very small quantities possible by so-called volumetric spraying (pulsed)
- Problems with over-spraying can be solved by micro-spraying
- Can be dosed exactly, only as much as necessary by as little as possible ("Less is more, even less is better")
In the process
- Reduction of cycle time → less spraying, no blowing out of residual release agents
- Reduction of compressed air
- Reduction of water
- Reduction of overspray
- Reduction of electrical energy for reheating the mold
- Reduction of release agent consumption
- Reduction of noise
- Small distance to the mould surface allows to reduce the pressure level
- Working with higher temperatures allows to optimize other parameters
- Increased efficiency of die casting process Resource-saving technology with high process reliability
For the mould
- No thermal shock on the mould surface
- No corrosion
- Increase in mould life
For the part quality
- Less porosity
- Less release agent deposition on the part surface, thus lower costs for further processing of the parts e.g. bonding, welding, KTL,...
- Lower rejection rate and better part quality
This results in significant potential savings:
- Energy costs: - 60-80%
- Compressed air: - 70-80
- Cycle time: - 10-20%
- Fresh water: - 99-100%
- Waste water: - 100%
- Mould life: + 50-300%
Example
Pulse spraying with DDV Nozzles
- Mask tool for shock tower
- Number of nozzles: 127
- Consumption per cycle: ~ 8 ml
Requirements
Optimized die cooling
- Surface temperatures should stay within 180° - 400°C
- Die has maybe to be modified to run at a higher temperature level
- A die that has sufficent cooling during production can be too cold at startup, therefore heating possibilities are also necessary
Collaboration
- Microspraying is a technologically demanding process, so close cooperation between the die casters and the suppliers is necessary before and during the start of the project
Spraying tool
- Spraying tool with DD or DDV nozzles
- Separating agent supply as for example OSA 1-50-2 or OSA 2-15
- ECO-prepared mould spraying machine (ex works or retrofitted)
- Booster station if air pressure network < 8 bar (only for DDV nozzles)