Copper and copper alloy large-scale artistic casting resin sand process for casting large-scale castings, generally using segmented block modeling, sand box modeling or steel pipe welding frame modeling, copper alloy formula is selected from ASTM B584 standard C90300 tin bronze with excellent casting performance (tin 7.5% ~ 9.0%, zinc 3.5% ~ 5.0%, copper 86.0% ~ 89.0%). The casting defects produced in the casting process mainly include: expansion box, slag inclusion, shrinkage porosity, insufficient pouring, etc. Now combined with specific production practice to analyze the causes of casting defects and how to prevent or reduce them.

Under watering

Performance characteristics

There is insufficient pouring at the bottom of the casting, there are flower blocks in the middle of the casting, or insufficient pouring on both sides.

Cause 

The pouring temperature is low, the pouring speed is slow, the sand mold exhaust hole is small, it is easy to produce suffocation, and the small part of the mold block is damaged.

Solution 

The resin sand curing agent is added in strict accordance with the proportions required in winter and summer, and the strength of the sand must be guaranteed; carefully check whether the small pieces of the sand are damaged and fall off before fitting, and whether the fitting is in place; Place the mold block flat or vertical; strictly control the process measures such as pouring temperature and pouring speed.

Advantages and disadvantages of cast bronze sculpture

As a kind of sculpture art, copper casting sculpture has a long history. It has become more and more mature in the continuous innovation of modern copper sculpture manufacturers. The material of cast copper sculpture is copper, so there are certain advantages and disadvantages in use.

The copper casting sculpture is made of copper as the main raw material. During the production, the metal is smelted into a liquid that meets certain requirements and poured into the mold. After cooling and solidification, it is made by a casting process with predetermined shape, size and performance Sculpture artwork.

Bronze sculpture has the following advantages:

1. The material has a long service life and is one of the permanent materials, which is not easy to weather and corrode (of course it will generate some patina, but it is much better than steel and will not rust too seriously);
2. As a metal material, it has the advantages of good elasticity and strong toughness, and can support a large volume with a few supporting points;
3. The sculpture is hollow, which can effectively control the weight, especially when making works that are top-heavy and the center is seriously deviated from the support point, you can make the top as thin as possible, and make the bottom thick to adjust the position of the center of gravity, which can be more firm, etc. For other materials, the advantages of cast copper are various.

Of course, cast bronze sculpture also has its shortcomings. It is easy to oxidize, so general cast copper sculpture should pay special attention to its maintenance. Also, it is heavy and expensive.

Conclusion

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