In order to solve the problems of low energy efficiency and great environmental impact in the traditional foundry industry, this paper explores the application of process design characteristic carbon benefit model in the traditional manufacturing industry. According to the characteristics of sand casting process and sand casting process design, a characteristic carbon benefit model of process design is established, which is composed of carbon emission, production time and resource cost. On the premise of ensuring the casting quality, taking the characteristic carbon benefit of process design as the optimization objective, and the process parameters related to casting geometric structure and pouring characteristics as the optimization object, the optimization method of process design characteristic carbon benefit was put forward. The casting process design and optimization method of disc castings and base castings were verified. The optimized process scheme has certain advantages in carbon emission, production time, resource cost and carbon efficiency. The specific work is as follows:

1. The technological process of sand casting is analyzed. combined with the characteristics of casting process plan, the process design characteristics of sand casting are divided into casting material characteristics, casting geometric structure characteristics and pouring features. the influence mechanism of process parameters related to the characteristics of sand casting process design is studied.

2. According to the characteristics of sand casting process and considering the influence factors of related parameters of process design characteristics, a characteristic carbon benefit model of sand casting process design based on carbon emission, production time and resource cost was established.

3. In this paper, an optimization method aiming at improving the characteristic carbon benefit of process design is put forward, and the casting results of different process schemes are calculated by combining the casting example and the characteristic carbon benefit model of process design. the effectiveness and feasibility of carbon benefit evaluation of different casting process schemes are analyzed.