Casting is a common method in industrial manufacturing models. Casting has less restrictions on the product and low internal stress in the product. Therefore, the production investment is less, and large-scale parts with excellent performance can be obtained, but the production cycle is long, and mechanical processing must be carried out after molding. At present, casting methods are derived from pouring, insert casting, pressure casting, spin casting and centrifugal casting. This article mainly briefly describes the specific technological process of casting.
- 1. Before casting, you must be fully familiar with the process documents of the casting. Before casting, you should understand the casting sequence, the required molten steel material, weight, and the distribution of the casting mold. Check whether the number of ladles, the quality of repairing ladle, and the drying and preheating are qualified, and whether the crane is running normally.
- 2. Check whether the sand box clips and lock box bolts are tight and firm, whether the weight and position of the weight are appropriate, and whether the riser ring, sprue cup, and sprue plug are properly placed. Eliminate unsafe factors in the casting channel.
- 3. According to the casting sequence, process requirements and gate plugs required for castings, etc. are properly placed. Whether the gate plugs required by the casting sequence, process requirements and casting requirements are properly placed.
- 4. The air should be entrained immediately after the casting starts, and the air should be entrained while casting. Large castings should ignite the ignition material next to the air outlet. When casting large pieces, pour one or two times from the riser after pouring, and the thin shell of the riser must be pried off before pouring.
- 5. When the molten steel is poured to 1/3 of the height of the riser, put it in the specified quantity. After pouring, the molten steel overflowing from the nozzle and the riser should be removed immediately, and the pouring cup should be removed to facilitate the normal shrinkage of the falling sand and the casting.
- 6. After the molten steel is completely solidified, the mold can be moved. In the later stage of casting, pay attention to the amount of molten steel in the bag. For the castings of important parts, the phenomenon of drinking slag is not allowed, and the remaining molten steel is poured into the remaining tank (mould).
- 7. The remaining sand mold should be covered with the pouring riser for re-arrangement. If the sand mold storage time does not exceed 48 hours, it can be poured normally. If it exceeds 48 hours, it should be checked to confirm whether the mold meets the requirements before deciding whether to use it. No casting.
For experienced casters, these technological processes are no longer familiar, but for novices, it is essential to study and study these technological processes, and a good casting process can make castings more accurate.