Dongguan Foundry talks about the temperature selection in the stainless steel casting process

Let's take the sand moldPrecision castingIn other words, many factories that produce production should create conditions to select technologically advanced modeling and core-making methods. The output rate of the old-fashioned shock or shock molding machine production line is not high enough, the labor intensity of the workers is large, the noise is large, and the production requirements are not accustomed to it, so it should be gradually reformed. For small castings, you can choose the horizontal or vertical parting boxless high-pressure molding machine production line, and the solid molding has high output power and less floor space; for middle parts, you can choose various boxed high-pressure molding machine production lines. , Air-punch molding line, according to the requirements of fast, high-precision molding production line, core-making methods can be selected: cold core box, hot core box, shell core and other efficient core-making methods, and medium-batch large castings can consider using resin Self-setting sand modeling and core making.

For heavy castings produced in small batches, manual molding is still an important method. Manual molding can adapt to various messy requirements and is more flexible, and does not require many process equipment. Can use sodium silicate sand mold, VRH method sodium silicate sand mold, organic ester sodium silicate self-hardening sand mold, clay dry, resin self-hardening sand mold and cement sand mold, etc.; for heavy castings produced in a single piece, the pit molding method is used for low cost and put into production quick. Multi-box and split-box modeling methods are more suitable for mass-produced or long-term shaped products. Although the initial investment in molds and sand boxes is high, it can be compensated by saving modeling man-hours and improving product quality.

Low-pressure precision casting, die casting, centrifugal casting and other casting methods are only suitable for mass production due to the expensive equipment and molds.

Conditions and methods should be appropriate

For example, it also produces large-scale machine tool bed and other castings. Generally, the core assembly method is used instead of the appearance and sand box, but the core is assembled in the pit; while other factories use the sand box method to make the appearance. Different companies have different production conditions (including equipment, locations, staff quality, etc.), production habits, and accumulated experiences. According to these conditions, what products are suitable and what products are not suitable (or unsuitable) should be considered.

Precision casting precision requirements and costs

The accuracy of castings obtained by various casting methods is different, and the initial investment and production rate are also inconsistent. After all, the economic benefits are also different. Therefore, in order to be more, faster, better, and less expensive, we should take all aspects into consideration. A preliminary cost estimate should be made for the selected casting method to determine a casting method that has high economic benefits and can ensure the requirements of the casting.

Although the development of China’s foundry industry is in a relatively difficult period, from a long-term perspective, there are still certain expectations for the development of China’s precision casting industry. With the strong strength of industrial development, trusting China's foundry industry will surely achieve gratifying results.

Experts said that in order to fundamentally advance the level of casting technology, the following four points must be achieved: First, to expand the simulation technology, advance the accuracy of the guess, strengthen the process control, and advance the yield. The problem of regularity is not well mastered, which affects the yield in mass production. Second, the integration of production, education and research. In addition to the enhancement of innovation awareness and the advancement of research and development capabilities, the independent innovation of enterprises also needs to focus on and strengthen the integration of "production, learning, and research" with precision casting enterprises as the main body. Third, focus on material research and development. Materials are the foundation of industry, and there was still a lot of work to be done at that time. In the field of aerospace, the research and smelting technology of some new materials such as alloy materials, especially high-temperature alloys, still need to be improved, and the distance from foreign countries is still relatively large. Fourth, pay attention to the advancement of equipment technology. The technology is still a problem of equipment. Many key equipment, such as some directional solidification equipment, still rely on imports, so the research and development of precision casting equipment is still the key.