Precoated sand shell molding is a core technology in resin sand casting: quartz sand is mixed with phenolic resin (a thermosetting resin), and after heating, the resin uniformly coats the sand particles to form "precoated sand"; a metal mold (iron or steel mold) is heated (200-300℃) to cure the precoated sand on the cavity surface into a high-strength sand shell (shell mold) with a thickness of 3-10mm. After the sand shells are assembled to form a cavity, the molten metal is poured, and the sand shell disintegrates to obtain the casting.
The sand shell has high strength (compressive strength ＞5MPa), with casting dimensional accuracy reaching IT10-IT12 and surface roughness of Ra12.5-25μm, making it suitable for stable mass production;
The sand shell has good collapsibility, simplifying the sand cleaning process and enabling automated assembly line production (cycle time ≤3 minutes/piece);
It is compatible with materials such as cast iron, cast steel, and aluminum alloys, with few internal defects in castings (porosity ＜1%);
The mold (metal mold) can be reused more than 100,000 times, and the larger the production volume, the lower the unit cost.
You can ask anything you want to know about Feedback.
Founded in 1996, our company is an enterprise with nearly 30 years of successful operation in Qingdao City, Shandong Province, China. We integrate production and trade into one operation. Additionally, we have cooperative factories that can undertake outsourcing services such as electroplating and spraying.
You can send your drawings and data files to us via the email provided on our official website. If you do not have drawings or data files, we can discuss conducting on-site or cooperative mapping, and the results will be confirmed with you before proceeding.
We offer a full range of production services including:
• Casting
• Heat treatment
• CNC machining
• Assembly
• Surface treatment
Our company operates under the following international and national management systems to ensure quality and environmental compliance:
Quality management systems: ISO 9001-2015 and IATF 16949:2016
Environmental management systems: GB/T 24001-2016 / ISO 14001:2015
For product development, we strictly implement the five phases of APQP (Advanced Product Quality Planning):
Planning and defining the project
Product design and development
Process design and development
Product and process validation
Feedback, assessment, and corrective actions
Through the systematic planning and implementation of these five phases, the ISO 9001-2015 and IATF 16949 standards ensure full-process quality control from product design to mass production, thereby enhancing product reliability and customer satisfaction.
The sample lead time varies depending on the material and complexity of the product. In general: If the mold is provided by the customer or available for use, the sample lead time is 15-30 days. If a new mold needs to be developed, the sample lead time is 30-45 days.
No. 248, Sancheng Road, Dianzi Town, Pingdu City, Qingdao
