HIGH STRENGTH AND DUCTILITY
New possibilities in high pressure die casting: Silicon tombac is the construction material with the highest strength that can be economically cast using the high pressure die casting process. This alloy is very suitable for thin-walled and heavy-duty structural parts.
Regardless of whether you require one single part or several million parts, we will find the optimal solution for you depending on the quantity required.
Pressure die casting using silicon tombac is more economical than the very complex process for steel investment casting. High pressure die casting using silicon tombac achieves significantly greater solidity when compared to aluminium or zinc high pressure die casting. In addition, it enables series production of thin-walled and heavy-duty construction parts. Tolerance ranges of ±0.05 mm are achievable in casting. Narrower tolerance ranges can be achieved in-house using subsequent fine blanking or CNC processing.
| Series Tool | Small series tool | Rapid Si-tombac | |
|---|---|---|---|
| Unit price | – | + | ++ |
| Tool costs | ++ | + | keine |
| Pass-through time | ++ | + | – |
| Advantages for you | Advantages for you | Advantages for you |
SILICON TOMBAC OPENS UP NEW OPPORTUNITIES
| Silicon Tombac | Aluminium | Zinc | unalloyed steel | stainless steel | |
|---|---|---|---|---|---|
| Process | High pressure die casting (HPDC) | High pressure die casting (HPDC) | High pressure die casting (HPDC) | Investment casting | Investment casting |
| Tensile strength Rm | > 500 MPa | 240-310 MPa | 280-330 MPa | 410-450 MPa | 450-650 MPa |
| Yield point Rp 0,2 | > 300 MPa | 140-240 MPa | 220-250MPa | 200-210 MPa | 175-200 MPa |
| Elongation at break A | > 8% | 1-4 % | 2-5 % | >10 % | >15 % |
| Density | 8,3 kg/dm³ | 2,7 kg/dm³ | 6,7 kg/dm³ | 7,9 kg/dm³ | 7,9 kg/dm³ |
| Hardness | >160 HB | 80-120 HB | 85-105 HB | 140 HB | 130-200 HB |
| Corrosion resistance | excellent | good | poor | poor | good |
| Emergency running characteristics | excellent | poor | poor | poor | poor |
| mechanical machinability | excellent | excellent | good | poor | poor |
Silicon tombac demonstrates high corrosion resistance.
- In the salt spray test in accordance with DIN 50021, there is discoloration but no corrosion even after 1,064 hours!*
*not applicable in an ammonia atmosphere.
Further properties of silicon tombac:
- Excellent friction-bearing properties; in particular also in same material pairings
- Heat resistance up to +200 °C constant, up to -200 °C a slight increase in solidity.
Tool wear is high when working at casting temperatures of 1,100 °C. The high pressure die casting moulds are therefore manufactured in such a way as to be extremely solid and to withstand the extreme conditions of production for as long as possible. Nonetheless, the availability of one’s own modern mould making facility is a prerequisite for the effective maintenance of the moulds.
We develop specific solutions in consultation with our customers’ design engineers. We manufacture according to your individual specifications. Silicon tombac is used in particular in machine and plant engineering, lock and fitting technology in addition to in the automotive and electrical industries. Thanks to copper’s antimicrobial properties, it has also been possible to tap into a further field of application, namely medical technology.
When the keyword “high pressure die casting” is mentioned, this is often associated with the processing of aluminium, zinc or magnesium. These materials are processed at comparatively low casting temperatures (< 700 °C) and are characterised by low strength levels. A material’s strength often grows as the melting temperature increases; so too for silicon tombac. We benefit from the high material strength of silicon tombac, while at the same time maintaining the economic advantages of the high pressure die casting process. Silicon tombac is also known under the name of OLKUSIL.
