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Alloy melt was pressed into the cavity, due to heat loss and Coagulation. If the heat transfer rate too fast and may cause cold pattern casting defects. On the contrary, the heat transfer rate is too slow, it would increase the casting of the forming cycle, reducing productivity. Mold Surface temperature control on the production of high quality die castings, which is very important. Mold temperature will affect the molten metal cavity surface flows, especially long thin pieces of mobile line.

To make the molten metal to fill the cavity before solidification, in addition to the design used to shorten the filling time, but also can increase the gate speed (but it is prone to turbulence), as increased mold temperature. In addition, larger and demanding casting surface, but also require high and stable mold surface temperature, can reduce the cooling lines and surface defects.

Uneven or inadequate size of the mold temperature will lead to instability in casting, in the top of the casting production process, deformation, resulting in heat stress, viscous modulus, surface depression, internal defects such as shrinkage and thermal bubble. Mold temperature difference is large, the production cycle variables, such as filling time, cooling time and spraying time have different degrees. In addition, the mold life will be too cold due to the impact of the hot rolled steel production lead to expensive thermal cracking and so on.

Appropriate surface temperature Appropriate mold surface temperature distribution must meet the product shape, such as thickness, cross-section of thickness changes in the surface requirements, and determined the production cycle. Generally appropriate temperature:
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Robamat Mold temperature Alloy mold surface temperature Aluminum 180-300oC Magnesium alloy 180-280oC Zinc alloy 100-200oC To attain the required die temperature, die-casting factory technicians often use Oil Gun, followed by radiation heating, or plug-in electric heating tube, but not ideal, failed to meet uniform mold temperature. However, the use of radiant heaters are more flexible and less damage to the mold, but less efficient; plug-in electric heating tube is only applicable to long-term position, a more limited range of applications.

In addition, the use of low pressure injection method - that is, reducing the initial injection speed, direct heating molten metal mold is a very common method, but this method adversely affect the life of the mold, does not apply to high precision mold . As the instantaneous phase at the time of injection, the temperature will melt the surface of invasive mold cavity, the depth of their invasion is about twice the thickness of casting. In the intense heat during the invasion, the cavity surface of the high temperature will make the cavity surface of high stress, micro-crack phenomenon relative chance will be doubled.

The best heating method for the hot oil should be heated. Uninterrupted hot oil pipeline through the mold, heating the mold from the inside to mold to the state for production. Because not only conducting oil heating, cooling can be like water-like, function like a heat exchanger as, mold temperature can be maintained within a certain range, even if the interruption of production can also be appropriate to maintain the mold temperature. Introduction

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