Preheating moulds and dies quickly

Preheating moulds and dies quickly

Permanent metal moulds enable parts to be produced with a high quality surface finish in large quantities. The quick and controlled cooling behaviour that ensues here can have an impact on the microstructure of the products.Get more news about bus generator assy,you can vist our website!

These tools are used in both gravity casting and casting procedures carried out under pressure. This is mainly with regards to moulds in gravity casting, tilt casting, centrifugal casting and low pressure casting processes, as well as die-casting moulds.

Moulds and dies must be preheated before their initial contact with the melt to avoid thermoelectric voltage arising due to large differences in temperature. So as not to reduce the service life of the moulds or damage the coating that has been applied, preheating is mainly carried out using thermal oil which is electrically heated and guided through channels in the mould, or direct fired onto the back of the mould using gas flames. These practices have elaborate mould designs and therefore long preheating times.

Depending on the size of the mould it can take several hours, leading to huge production losses during regular refits and even more so during spontaneous refits. Directly heating moulds with flame burners and controlling the temperature of moulds using thermal casting are both widely used methods today. These methods shorten the service life of the moulds. The waste and therefore the amount of recycled material in the melting furnace rises, which has a negative effect on the product quality. The level of power consumption is also considerably higher compared to the flameless gas burner technology.With its flameless gas burner technology, promeos® creates direct heating systems and facilities, which adapt to meet the requirements of the casting process and ensure that moulds are heated quickly and evenly without damaging the material. Overheating caused by exposure to localised fire is completely avoided, meaning that the service life of the mould is not affected.

The burner capacity can be adjusted to any level across a wide range, providing optimum temperature control when preheating.
Shorter heating times equate to gains in production time. In this way, the precisely controlled burners allow for a high level of reproducibility and lead to an improvement in quality.

The intelligently integrated reo®, neo or ceo® burners offer heat in the form of hot air, convection, solid-state radiation and gas radiation from 100°C to 1,400°C. The fields of application for the flameless gas burner from promeos® are extremely varied.

The technology is already being used both for heating moulds in casting machines and in preheating stations. By using various heat transfer mechanisms, different target temperature ranges can be achieved.