Another subsidy method that does not require product structure design changes is heating subsidy. The heating subsidy is to add heating materials on the surface of the casting, heat the casting through the heating materials, and establish a feeding channel to achieve sequential solidification.
Taking the model as an example, heat subsidies are added on both sides of the casting, as shown in Fig. 1. The materials of heat subsidies are the same as those of heat risers. The simulation results are shown in Fig. 2. It can be seen that the casting realizes sequential solidification, and the effect of heat subsidies is obvious.
The heating subsidy is a separate heating material, which needs to be developed into a mold for molding. The production process is similar to the heating riser. After molding, it is assembled with the sand mold by bonding or matching, which will form additional parting lines and need to be polished, so it needs to increase the cost of heating materials and labor costs. From the perspective of operability, it is the most complex of the three subsidies. In addition, for ductile iron products, Special attention should be paid to the graphite morphology at the heating allowance.
Taking the support seat product in the above text as an example, the heating subsidy scheme can also be used to optimize. A heating block can be added at the position shown in Fig. 3. The heating subsidy is made separately. After being made, it is bonded with the main sand core as a whole, as shown in Fig. 4.
