For example, in sand precision casting, factories that produce in large quantities should create conditions to adopt technologically advanced modeling and core making methods. The production line of old-fashioned shock or shock compression molding machines is not high enough in productivity, and workers have high labor intensity and high noise, which is not suitable for the requirements of mass production. Therefore, it should be gradually transformed. For small castings, a box less high-pressure molding machine production line with horizontal or vertical parting can be used, which has high production efficiency and less floor space for solid molding; For mid size components, various box high-pressure molding machine production lines and air impact molding lines can be selected to meet the requirements of fast and high-precision molding production lines. The core making methods can include efficient core making methods such as cold core box, hot core box, shell core, etc.
Medium batch large castings can be considered for resin self hardening sand molding and core making.
For heavy castings produced in small batches, manual molding is still an important method. Manual molding can adapt to various complex requirements and is relatively flexible, without requiring many process equipment. It can be applied to water glass sand molds, VRH water glass sand molds, organic ester water glass self hardening sand molds, clay dry molds, resin self hardening sand molds, and cement sand molds; For heavy castings produced in single piece production, the pit molding method has low cost and fast production.
Mass production or long-term production of standardized products using multi box modeling or split box modeling is more suitable. Although the initial investment in molds, sandboxes, etc. is high, compensation can be obtained from saving molding time and improving product quality. Low pressure casting, die casting, centrifugal casting, and other casting methods are only suitable for mass production due to the high cost of equipment and molds. The conditional method should be suitable for producing castings such as large machine tool beds, generally using the core forming method without making patterns or sandboxes, and assembling cores in pits; And other factories use the sand box molding method to create patterns.
Different enterprises have different production conditions (including equipment, venue, employee quality, etc.), production habits, and accumulated experience. Based on these conditions, it is necessary to consider what products are suitable for production and what products are not suitable (or cannot) for production. The accuracy requirements and costs of castings obtained by various casting methods are different, and the initial investment and productivity are also different, resulting in differences in economic benefits. Therefore, in order to achieve abundance, speed, quality, and economy, it is necessary to take into account all aspects. A preliminary cost estimation should be conducted on the selected casting method to determine the casting method that has high economic benefits and can meet the casting requirements.