Why is the appearance of products produced by steel casting manufacturers rough
The variety of products produced by steel casting manufacturers used in machinery is relatively diverse, such as shape, complex structure, quality requirements, etc., which have an impact on the casting itself. In the process of production, most of them adopt the pouring method, and the defects such as cracking, sand sticking and sand flushing are relatively common in the process of pouring, which will lead to poor appearance quality of castings, which will increase the workload of finishing, and there will be obvious differences between the appearance of products produced by other large steel casting plants.
During the processing of steel castings, attention should be paid not only to quality problems, but also to the appearance of products. The following are the reasons for the poor appearance quality of castings:
1. The grain size of molding sand and sand core is coarse and the compactness is low;
2. The coating selection is poor, and the thickness of the coating is uneven, and the coating will peel off;
3. The pouring temperature is also too high, and the hydraulic pressure is relatively high;
4. The upper box or gate cup is too high, and the hydrostatic pressure is too high;
5. The molding sand and core sand have many attachments, low fire resistance and poor thermal conductivity;
6. The molding sand and core sand contain more recycled sand, and the sintering temperature is low;
7. When the sand falls out of the box late, solid hot bonded sand will be formed, especially some thick castings and high melting point alloy castings;
8. Liquid metal has good fluidity, but low surface tension;
9. Improper treatment of gating system and riser, resulting in local overheating;
The reasons for rough appearance of castings summarized above can be prevented from these points when producing products. If you have any questions, you can leave a message and we are ready to serve you!