Use and repair sand box 1) sand box should be carefully checked before use key parts box shafts, rings, box angle, the tank wall, etc., found that the situation had split, damage, etc. should be discontinued. 2) For steel, cast iron in the sand box, the length of the direction of the wall deformation, sand box supply, allowing no more than partial to expand outwardly 15mm, inwardly no more than 8mm. High pressure and Chute sand box is not included. 3) When the dowel holes, positioning sleeve bore wear amount exceeds the limit, allowing inlay repair, but no more than twice; high-pressure molding machine positioning flask sleeve bore wear limit must not exceed ± 0.2mm: according to the product conditions different, Changyi sand box, the wear limit can be appropriately enlarged or reduced. EPC technology sandbox technology first made by EPC foam model, linked to a special paint coating, drying sand placed in a special box, fill in the dry sand, three-dimensional vibration compaction, the vacuum state casting, sand box manufacturers, Model gasification disappear, metal replacement model, replicate the same mold with foam casting, the vacuum is released after condensation, remove the castings from loose sand, sand box next cycle price, Dragon Industrial (certified), Changyi sand box provided by the Industrial Development Co., Ltd. Shandong dragon. Shandong dragon Development Co., Ltd. (www.julongshiye.com/) Shandong Weifang, machining leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Industry leaders at the dragon with the staff warmly welcome all inquiries negotiations to create a better future dragon Industry.