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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 a lot of 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 a single piece, the pit forming method has low cost and fast production. It is more suitable to use multi box molding and split box molding methods for mass production or long-term production of standardized products. Although the investment in molds, sandboxes, etc. is initially high, it can be compensated by 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 expensive equipment and molds.

The conditional method should be suitable

For example, for the production of large machine tool bed frames and other castings, the core forming method is generally used, without making patterns or sandboxes, and core forming is done in the pit; And other factories use the sand box molding method to produce patterns. Different enterprises have different production conditions (including equipment, site, employee quality, etc.), production habits, and accumulated experience. Therefore, it is necessary to consider what products are suitable for production and what products are not suitable (or cannot be) produced based on these conditions.

Accuracy requirements and cost

The precision of castings obtained by various casting methods is different, and the initial investment and productivity are also inconsistent, resulting in differences in the final economic benefits. Therefore, in order to achieve more, faster, better, and more cost-effective, we should take into account all aspects. A preliminary cost estimate should be made for the selected casting method to determine a casting method that is economically efficient and meets the requirements of the casting.

Although the development of China's casting industry is in a relatively difficult period, from a long-term perspective, there is still some hope for the development of China's precision casting industry. Market demand has slowly begun to recover, and coupled with the strong strength of China's casting industry development, it is believed that China's casting industry will achieve remarkable results.