Characteristics of precision casting industry
Investment casting, commonly used in precision casting, is also called lost wax casting: using suitable investment materials (such as paraffin) to make investment molds, repeatedly melting refractory coatings and spraying refractory sand, hardening, shelling, and drying ; Dissolve the internal investment mold to obtain the mold cavity, bake the mold shell to obtain sufficient strength, burn the remaining mold material, and after shelling, pour, solidify, cool, and clean the metal materials required to obtain a high-precision finished product. . Heat treatment and cold processing and surface treatment may be carried out according to the needs of the product. For example, in sand casting, mass production plants should create conditions to adopt advanced process modeling and core making methods. The old-fashioned shock-type or shock-type molding machine production lines have insufficient productivity, high labor intensity for workers, and loud noise. They are not suitable for mass production requirements and should be gradually transformed. For small castings, horizontal or vertical parting box-type high-pressure molding machine production lines can be used. The real molding production efficiency is high and the floor space is small. According to the medium, a variety of box-type high-pressure molding machine production lines and air forming lines can be selected. To meet the requirements of fast and high-precision molding production lines, the core pulling method can be used. For small castings, horizontal or vertical parting box-type high-pressure molding machine production lines can be used. The real molding production efficiency is high and the floor space is small; for media A variety of box-type high-pressure molding machine production lines and air forming lines can be selected to meet the requirements of fast and high-precision molding production lines. The core-pulling method can be used. For small castings, horizontal or vertical parting box-type high-pressure molding machine production lines can be used, which is truly The molding production efficiency is high and the floor space is small; a variety of box high-pressure molding machine production lines and air molding lines can be selected for the media to meet the requirements of fast and high-precision molding production lines. The core-pulling method can be used
High-efficiency core making methods such as shell core. For medium-volume large castings, resin self-hardening sand molding cores can be considered. Manual molding is still an important method for the production of heavy-duty castings in small batches of single pieces. Manual molding can be more flexibly adapted to various complex requirements and does not require a lot of process equipment. Heavy castings can be produced from single pieces such as sodium silicate sand, VRH water glass sand molds, organic ester water glass self-hardening sand molds, clay dry sand molds, resin self-hardening sand molds, cement sand molds, etc. The pit modeling method is low-cost and fast to produce.
For batch or long-term production of stereotyped products, multi-box molding is used, and the split box molding method is more suitable. Although the initial investment in molds, sand boxes, etc. is relatively high, it can be compensated by saving molding hours and improving product quality.
Casting methods such as low-pressure casting, die casting, and centrifugal casting are only suitable for mass production because the equipment and molds are expensive.
1. The conditional method should be suitable for the production of large machine tool beds, such as castings, which generally use the core molding method, without making the appearance and sand box, in the pit core, while other factories use the sand box molding method to make Exterior.
Different enterprises have different production conditions (including equipment, sites, employee quality, etc.), production habits, and accumulated experience. Based on these conditions, we should consider what products are suitable and what products are not suitable (or cannot) be made.
2. Precision requirements and costs: The precision of castings obtained by various casting methods is different, the initial investment and productivity are also inconsistent, and the final economic benefits are also different. Therefore, in order to achieve more, faster, better and cheaper, all aspects should be taken into consideration.
A preliminary cost estimate should be made for the selected casting method to determine the casting method with high economic benefits and that can ensure the casting requirements.
Although the development of my country's casting industry is in a relatively difficult period, in the long run, there is still some hope for the development of my country's precision casting industry. Market demand has slowly begun to pick up. In addition, the development of my country's casting industry has a strong industry Strength, I believe that our country's foundry industry will definitely achieve gratifying results. Experts said that to fundamentally improve casting technology, the following four points must be done: First, develop simulation technology, improve prediction accuracy, strengthen process control, and improve yield. Regularity issues are not well grasped, thus affecting the yield during mass production. The second is the combination of scientific research and production. In addition to enhancing innovation awareness and R&D capabilities, independent innovation of enterprises also needs to pay attention to and strengthen the "industry-university-research" integration with precision casting enterprises as the main body. Third, we must pay attention to material development. Materials are the basis of industry, and there is still a lot of work to be done. In the aerospace field, the research and smelting technology of some new materials, such as alloy materials, especially high-temperature alloys, still need to be improved, and there is a large gap with foreign countries. 4. Pay attention to equipment and technology upgrades. Enterprise independent innovation also needs to pay attention to and strengthen the "industry-university-research" integration with precision casting enterprises as the main body. Third, we must pay attention to material development. Materials are the basis of industry, and there is still a lot of work to be done. In the aerospace field, the research and smelting technology of some new materials, such as alloy materials, especially high-temperature alloys, still need to be improved, and there is a large gap with foreign countries. 4. Pay attention to equipment and technology upgrades. Enterprise independent innovation also needs to pay attention to and strengthen the "industry-university-research" integration with precision casting enterprises as the main body. Third, we must pay attention to material development. Materials are the basis of industry, and there is still a lot of work to be done. In the aerospace field, the research and smelting technology of some new materials, such as alloy materials, especially high-temperature alloys, still need to be improved, and there is a large gap with foreign countries. 4. Pay attention to equipment and technology upgrades. There is still much work to be done. In the aerospace field, the research and smelting technology of some new materials, such as alloy materials, especially high-temperature alloys, still need to be improved, and there is a large gap with foreign countries. 4. Pay attention to equipment and technology upgrades. There is still much work to be done. In the aerospace field, the research and smelting technology of some new materials, such as alloy materials, especially high-temperature alloys, still need to be improved, and there is a large gap with foreign countries. 4. Pay attention to equipment and technology upgrades.
Technology is mainly a matter of equipment. Many key equipment, such as some directional solidification equipment, mainly rely on imports, so the development of precision casting equipment is still a focus.
