What are the technical requirements for precision casting?

What are the technical requirements for precision casting?

Precision casting refers to the general term for obtaining precise dimensional casting processes. Compared to traditional sand casting technology, precision casting produces castings with more precise dimensions and better surface smoothness. It includes investment casting, ceramic casting, metal casting, pressure casting, and lost foam casting. What are the technical requirements for precision casting for precision casting manufacturers?

1. Method adaptation

For example, in sand casting, factories that produce in large quantities should create conditions to adopt technologically advanced molding and core making methods. The production line of old-fashioned shock-absorbing or shock-absorbing molding machines has insufficient productivity, high labor intensity of workers, 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 footprint for solid molding; For medium 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, and shell core.

Medium batch large castings can be considered for resin self hardening sand molding and core making. For heavy castings produced in small batches, manual shaping is still an important method. Manual shaping 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 method water glass sand molds, organic ester water glass self hardening sand molds, clay dry molds, resin self hardening sand molds, and cement sand molds, etc; For heavy castings produced in single piece production, the pit molding method has low cost and fast production. The use of multi box and split box molding methods is more suitable for batch or long-term production of standardized products. Although molds, sandboxes, and other materials may require high initial investment, they can be compensated for 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 high cost of equipment and molds.

2. The conditional method should be suitable for

For example, when producing castings such as large machine tool beds, the core forming method is generally adopted, without making patterns or sand boxes, and the core is assembled in the pit; And another factory uses the sandbox molding method to make patterns. Different enterprises have different production conditions (including equipment, site, 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.

Precision machining