The hot-box processes has very high demands concerning the quality of the quartz sand. In particular, the percentage of alkalis and the clay content need to be as low as possible.

Gas extraction from hot-box cores is of particular importance for organically bound mold materials since the binders largely decompose under the casting conditions. Pyrolysis (i.e. the decomposition of binders due to heat) generates breakdown products from the binder components, such as hydrogen, carbon monoxide, methane, carbon dioxide, nitrogen and higher-order hydrocarbons. The resulting core gases have to be extracted by means of particularly effective measures. Ideally, they are extracted via the core prints.

The dynamics of gas evolution have a significant impact on the tendency towards defects. Hot-box binders based on phenolic resin show a favorable gas evolution behavior. In addition, this process involves a relatively low binder content, ensuring good permeability to gas which also reduces the tendency towards defects.

The hardening of hot-box cores is carried out in metal core boxes. The heating elements are integrated into the core boxes. Direct heating can be accomplished using electric hot plates or gas-fired hot plates. Generally, electrical core box heating is preferred for small cores. What is important is that the core box is completely enclosed in order to evenly supply heat to the core. If the core box equipment includes a recess (mandrel) or a larger core box bottom, these are separately heated by means of integrated cartridge heaters.

The core box equipment for large cores is often directly fitted with heating resistors. This is done by integrating cartridge heaters or flexible tubular heaters. Gas heaters prevail with very large cores and core boxes as they allow for more cost-efficient equipment and easier maintenance and repair. Here, heating only occurs via hot plates, transferring their heat to the core box parts during hardening.

Ensuring an even temperature in all parts of the core box is essential in order to achieve rapid and above all even and full hardening. This requirement is particularly difficult to meet with large and geometrically complex core boxes.

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Q:How many days will be used to produce this hot box sand core shooter?

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