The carbon benefits of the three process schemes are calculated according to the formula. According to the production target priority of a foundry, the weighting factors in the formula are carbon emission 0.45, production time 0.78 and resource cost 0.62. The carbon benefit of FE1 is 12012.703 and the carbon benefit of FE3 is 10548.009. The carbon benefit of FE3 is 10503.226. The lower the value of carbon benefit is, the better the benefit is. FE1 is made by machining, and FE2 and FE3 are made by core-making method. In the case of producing 10 castings, the benefit of core-making scheme is better. However, after all the core-making hole-making scheme is adopted, the benefit of FE3 is better after optimizing the process parameters related to the casting geometric structure.
Through the calculation results of three process schemes, the following conclusions are drawn:
The main results are as follows: 1) by establishing the direct relationship between process design characteristics and carbon emission, production time and resource cost in the design stage, the carbon benefit indexes of the three process schemes are evaluated in detail. In the processing and production of 10 disc castings, the carbon efficiency of the process design scheme can be effectively improved by comparing the hole-making scheme of machining process and using the hole-making scheme of sand core. By optimizing the process parameters related to the characteristics of casting geometry, such as hole processing margin, the optimization scheme (FE3) achieves the optimization in terms of carbon emission, production time and resource cost, which further improves the carbon efficiency of sand core drilling scheme.
2) by establishing the carbon benefit model of carbon emission, production time and resource cost under the influence of casting geometric structure characteristics, three different casting process schemes are evaluated. It is found that the process planning characteristic carbon benefit model can optimize the process parameters related to the process planning characteristics. The optimization results show that the optimization method aiming at the characteristic carbon benefit of process design can not only improve the process design scheme, but also improve the efficiency of the process plan, and to a certain extent, it can help enterprises to choose more feasible energy saving and emission reduction strategies.