The analysis of sand casting process parameters is the basis of carbon emission calculation and modeling. The casting process design of sand casting includes the production batch, technical requirements and structural process analysis of parts, selection of casting method, determination of pouring position and parting surface, core design, calculation and selection of process parameters, pouring riser, cold iron and subsidy design, process output and documentation, and auxiliary tooling design. The main contents of casting process design can be divided into process scheme design and sand mold casting process parameter design. The process parameter design part of sand casting process design is mainly analyzed. The typical casting process parameters of sand casting include casting linear shrinkage, machining allowance, mold pulling inclination, minimum casting hole size, process correction, negative parting, negative core parting On this basis, this paper continues to introduce the pouring temperature, pouring time, casting material and other process parameters of sand casting. These parameters are not in the design content of conventional sand casting process parameters, but they are the key parameters that must be considered in the process design of sand casting.
There are various sand casting methods, which are generally selected according to the dimensional accuracy, surface roughness, alloy type, structural characteristics and production batch of castings. Sand casting methods can be used for general iron castings and aluminum copper alloys with low accuracy requirements. After the casting method is selected, the casting process design of sand casting can be started, Content of casting process design. It includes two kinds of design contents: casting process scheme design and casting process parameter design. Sand casting process plan usually includes design contents such as modeling and core making method, selection of mold type, determination of pouring position and parting surface, composition of sand core, layout of pouring system, distribution of feeding system, setting position of cold iron and so on. A good sand casting process scheme design is the most basic and important step to obtain a good casting process. A good sand casting scheme can improve the casting quality, save pattern materials, simplify the sand casting process and improve productivity.
The sand casting process design scheme determines the process arrangement of the sand casting process. Among the casting process parameters in the sand casting process design, the casting shrinkage, machining allowance, mold starting inclination, minimum casting hole size, process correction amount, negative number of parting, negative number of core parting, reverse deformation, pouring temperature, pouring time, reverse deformation and other parameters, It does not directly affect the process, but has an impact on the direct action objects of the process, such as molding sand. Appropriate sand casting process parameters ensure the accuracy of the size and shape of the casting. Further, it has an impact on the input and output of materials, energy and waste in the sand casting process. The selection of process parameters affects the materials, energy and waste in the process The amount of energy consumed and emissions generated. Compared with the macro design such as the determination of pouring position of process scheme and the selection of molding method, the design of specific parameters such as machining allowance and pouring temperature of process parameters has more advantages of quantitative calculation, so only the influence of specific process parameters on carbon emission of sand casting is considered.