SPECIAL ALLOYS SPECIAL ALLOYS FOR MOULDS ADVANTAGES OF THE PRODUCTION OF ALUMINIUM MOULDS ALUMINIUM vs STEEL WEIGHT Aluminium is one third of steel in terms of weight. The lightness of this material greatly facilitates the handling of large blocks, reducing costs such as transport cost. Compared to steel, aluminium is an easier material to be machined; therefore, it is possible to improve delivery times when the mould is made of aluminium. MOULDS FOR THE PRODUCTION OF PLASTIC PARTS Aluminium is a great conductor and heat sink. The temperature is evacuated from the mould 3 to 4 times faster than in the same steel mould; the cycles reduce up to 25% in time, hence the increase in productivity. For years, every effort has been invested in reducing the cycle time of the production of the plastic part through pressures, materials and rendering of blowing-injection transformation machines. It is in the cooling/heating process of the mould that we can notice great benefits in the use of aluminium moulds. MACHINING PROCESS FACE AND SIDE MILLING TOTAL MACHINING TIME OTHER ADVANTAGES OF THE PRODUCTION OF ALUMINIUM MOULDS - Excellent (mirrored) polishing - Production of parts: up to 2 million units - High thermal conductivity, reducing stabilization times - Less machine and tool wear - Lower cost of production REDUCE YOUR COSTS WITH OUR WATERJET CUTTING SERVICE!

In order to show the advantages of the production of aluminium moulds compared with the production of steel moulds, we present two practical cases, in which the same moulds were produced in 7075 aluminium alloy and in steel 37. In table 1 we can obtain information about the parts and in table 2 the gains/benefits in using the aluminium mould. TABLE 1 - INJECTION PROCESS OF PARTS Type of Plastic Plastic injection temperature Mould Temperature Injection Pressure Mould Material TABLE 2 - GAINS/BENEFITS IN USING ALUMINIUM MOULD GAINS/BENEFITS IN USING AN ALUMINIUM COMPOSITE MOULD Mould weight Mould...

SPECIAL ALLOYS FOR MOULDS SPECIAL ALLOYS COMPARISON WITH STEEL HOKOTOL® VS STEEL PHYSICAL PROPERTIES IN COMPARISON WITH STEEL Property HOKOTOL® Steel 1.2312 (40CrMnMoS8-6) COMPARISON Thermal conductivity at room temperature [W/(m· K )] 154 35 Electrical conductivity at room temperature [m/Ω · mm2] 23 10. 3 Thermal conductivity at room temperature [W/(m· K )] 130 35 Electrical conductivity at room temperature [m/Ω · mm2] 17. 4 10. 3 Hardness Density WELDURAL® VS STEEL PHYSICAL PROPERTIES IN COMPARISON WITH STEEL Property WELDURAL® Steel 1.2312 (40CrMnMoS8-6) COMPARISON Hardness Density MATERIAL...

SPECIAL ALLOYS FOR MOULDS PETP amorphous 1,000,000 to 2,000,000 (large S of parts) 100,000 to 50,000 (small S. of parts) CERTAL®/ CERTAL® SPC ALUMOLD® 100,000 to 500,000 (mean S. of parts) up to 5,000 parts ECONOMY - PRODUCTION OF 100,000 PARTS COSTS SPECIAL ALLOYS

SPECIAL ALLOYS SPECIAL ALLOYS FOR MOULDS POLISHING WELDURAL® and HOKOTOL® have excellent mechanical properties in a wide range of applications. An important factor in the production of moulds is the excellent surface quality for components with aesthetic requirements. This can only be achieved if the surface of the mould material is well polished. Both HOKOTOL® and WELDURAL® alloys have a good polishing capacity. Below we show the data corresponding to the typical roughness of HOKOTOL® and WELDURAL®. We can obtain very satisfactory roughness values with standard polishing procedures. This means...

SPECIAL ALLOYS FOR MOULDS Many aluminium alloys, including WELDURAL® and HOKOTOL® can be coated to improve the characteristics of their specific surfaces. The coating material to be used depends on the alloy used. WELDURAL®, for example shows good rigid anodizing results. SPECIAL ALLOYS COATING ADVANTAGES Improves mould service time Increases the number of production cycles Below we show two examples of coating for WELDURAL® and HOKOTOL®. Improves corrosion protection Improves surface quality HARD CHEMICAL NICKEL COATING Elemental Nickel is used for protection against wear or corrosion. A very...