The carbon emission and carbon efficiency of single casting technology and composite casting technology are analyzed in combination with Fig. 1 and Fig. 2. It can be seen from Figure 1 that material carbon emission and energy carbon emission are the main components of carbon emission, and the optimized composite forming method reduces material carbon emission, energy carbon emission and unexpected carbon emission compared with traditional pattern modeling. Specifically, the reduction in the consumption of metal materials and modeling materials reduces the carbon emission of materials by about 12.62% compared with the traditional pattern modeling.
Under the production conditions of A1B1 and A1B1, the production energy consumption per unit casting is reduced and the energy materials including natural gas, alcohol and coke are saved, so that the energy carbon emission is reduced by about 9.46% and 7.78% respectively compared with the traditional pattern modeling. Moreover, due to the reduction of the use of furan resin sand and waste treatment, the unexpected carbon emission of the composite forming method is only 0.309kg CO2, which is significantly reduced compared with the traditional pattern modeling. In terms of total carbon emission, compared with the traditional pattern modeling, the optimized composite forming methods A1B1 and A1B1 reduce 23.318kg CO2 and 21.780kg CO2 respectively, about 11.63% and 11.06%, and have great low-carbon capacity.
As can be seen from Figure 2, the carbon efficiency basically shows an upward trend according to the ranking of casting methods. Similar to the energy efficiency ratio, the calculation of carbon efficiency is related to the production efficiency and carbon emission per unit casting. According to the discussion on the production efficiency of composite forming method and traditional pattern modeling, we can know the reason why composite forming method improves carbon efficiency, that is, the result of the joint action of high production efficiency and low carbon emission. In conclusion, compared with the traditional pattern modeling, the composite mold process optimization design scheme can effectively reduce the carbon emission in theand has obvious energy-saving and emission reduction ability.