Technology -

ejection plate ejectors 1. Principle During high-pressure casting of zinc alloys or zamak, molten is injected at very high speed into a high-quality steel die at a temperature of 425°C and under an injection pressure of up to 500 bar. A fully automated casting cycle consists of: • the closing of the die with a hydraulic closing unit • the injection and cooling of the metal • the opening of the die and the ejection of the casting after solidifying The die, which is vital to the quality of the casting and the reliability of the process, consists of a fixed half and a moving half, into which an ejection plate with ejector is integrated (figure 1).

moving half fixed half

Figure 1: Zamak die 2. Alloys

Zamak is a zinc consisting of more than 90% zinc, supplemented with a number of alloy elements, of which aluminium and copper are the main ones. The extent to which these various elements occur determines the physical and mechanical properties of the alloys. All alloys used by Pedeo satisfy the provisions of RoHS, REACH and ELV.

3. Properties Zamak’s main characteristic is its low viscosity. This allows extremely accurate parts with very thin walls to be cast. Zamak is therefore particularly well suited to small parts with close tolerances. Thanks to its lower smelting temperature, however, zamak is less well suited to parts whose operational temperature exceeds 110°C. The table below groups together the key properties of the zinc alloys processed by us. The standard alloy is EN-ZL0410 to European standard EN1774:1 997. If you do not see the property you are looking for here, do not hesitate to contact us.

Alloy EN-ZL0410 EN-ZL0430 (to EN 1774:1 997) (GD-ZnA14Cu1) (GD-ZnA14Cu3) Property Mechanical properties Tensile strength (MPa) 280-350 330-380 0,2% yield limit (MPa) 220-350 310-350 Elongation after fracture (%) 2-5 5-10 Hardness (HΒ) 85-105 100-130 Physical properties Specific gravity (g/cm3) 6,7 6,8 Linear coefficient of expansion (1/K.10) 27 27 Thermal conductivity (W/cm.K) 0,92-1,05 0,92-1,05 Electrical conductivity (m/Ω.mm2) 15 15-16 Operating properties Maximum operation temp. (°C) 120 120 Minimum operating temp. (°C) -15 -15 Surface roughness (Ra) 1,6-3,2 1,6-3,2 Table 1: Zamak alloys and their properties

www.pedeo.be Technology Aluminium Die casting zinc - aluminium

ejection plate ejectors 1. Principle During high-pressure casting of aluminium, molten metal is injected at very high speed into a high-quality steel die at a temperature of 670°C and under an injection pressure of up to 1000 bar. A fully automated casting cycle consists of: • the closing of the die with a hydraulic closing unit • the injection and cooling of the metal • the opening of the die and the ejection of the casting after solidifying The die, which is vital to the quality of the casting and the reliability of the process, consists of a fixed half and a moving half, into which an ejection plate with ejector is integrated (figure 2).

moving half fixed half

Figure 2: Aluminium die 2. Alloys

Aluminium high-pressure cast alloys are characterised by their high Si content. This promotes castability. Other principal alloy elements are Cu, Fe, Mg and Mn. The extent to which these various elements occur determines the physical and mechanical properties of the alloys. All alloys used by Pedeo satisfy the provisions of RoHS, REACH and ELV.

3. Properties The main characteristic of aluminium alloys is their high tensile strength-to-weight ratio. Thanks to the near-netshape design that high-pressure casting allows, this property is boosted even further. The table below groups together the key properties of the main aluminium alloys processed by us. The standard alloy is ENAC-471 00 to European standard EN1 706:1998. If you do not see the property you are looking for here, do not hesitate to contact us.

Alloy EN AC-46000 EN AC-47100 (to EN 1706:1998) (EN AC AISi9Cu3(Fe) (EN AC AISi1 2Cu1(Fe) Property Mechanical properties Tensile strength (MPa) 240-310 220-300 0,2% yield limit (MPa) 140-240 140-200 Elongation after fracture (%) 0,5-3 1-3 Hardness (HΒ) 80-120 60-100 Physical properties Specific gravity (g/cm3) 2,75 2,65 Linear coefficient of expansion (1/K.10) 21 21 Thermal conductivity (W/cm.K) 1,1-1,3 1,2-1,4 Electrical conductivity (m/Ω.mm2) 14-17 15-18 Operating properties Maximum operation temp. (°C) 250 250 Minimum operating temp. (°C) -40 -40 Surface roughness (Ra) 1,6-3,2 1,6-3,2 Table 2: Aluminium alloys and their properties 190801 www.pedeo.be