The first step of lost-foam casting is the creation of the foam mold. A block of polystyrene foam is cut into the exact shape of the finished product using hand or power tools. For a small volume runs  the pattern can be hand cut or machined from a solid block of foam. If the volume is large enough, the partten can be mass- produced  by a process similar ejection molding. For applications where the dimensions of the finished piece must be exact, power tooling is preferred for a more consistent shaping of the foam. Pre-made pouring runners, and risers can be glued to the pattern to finish it. The foam pattern is then dipped in sheetrock mud or plaster and coated thoroughly.

After the foam mold is finished, it is buried in a container; for example, a metal drum; filled with compacted sand. The very ends of the foam shape are left exposed to facilitate the entry of the molten metal into the mold. A homemade tool can be used during this step to help the process along further. This tool, which consists of a hinged cylinder that can be opened and closed along the side by long handles, is placed on the sand so that it surrounds the foam piece. When the metal is poured, the cylinder walls contain it and allow it to build up over the piece, creating more pressure and, therefore, a more thorough casting.

Lost foam casting in Vietnam

Vietnam now becomes an excellent place to source products, and assuming that your product can be made here, maybe cheaper cost and high quality. Many people are finding that the products can be better in Vietnam.

Vietnam has set up several industrial Investment Zones to promote free trade. In 2019, there are over 18 Economic Zones and 369 Industrial Zones. The manufacture landscape of Vietnam is now better and clear.

Foundry companies in Vietnam, especially traditional villages, is now investing in mass production, improving their capability and quality.  Many customer found that the skill of worker here is very high- qualified. Vietnam foundry focuses on sand casting technology, including green-sand system, furan, lost foam,.. The lost foam casting technology is widely and popular applied in foundries in Vietnam of its economic effectiveness and high quality. 

Taniguchi Vietnam casting 

We are proud to be an expert in casting industry. We manily do gray cast iron, nodular cast iron and stainless steel. Our products are highly appreciated by Japan market by its quality. With 50 years experience, we now transfer and train a technical to Vietnam foundry company. We comprehensively cooperated with many foundry companies which can well perform the casting processes such as green sand, furan, lost foam casting. Our strength is lost foam casting, we have factory to make lost foam pattern, we have mold maker and cooperate with equipment supplier (coating, machine,..) who are experts in this industry. And our Japanese engineer always works closely with production line, observes and monitors whole process from molding, pattern, casting, machining. Therefore we are confidently assure our quality before shipment. 

We do many OEM casting part: motor housing, pump housing, lamp post, manhole, pulley...

To discuss your inquiry please send us email here