The basic principles of casting sand box sand box ① design specifications as standardization, serialization, universal, in order to reduce the number of sand box, reduce production costs, ease of manufacturing and management. ② sand box structure, hanging shafts, rings and fastening means have sufficient strength and rigidity and durability. ③ meet the technological requirements and ensure the safety of the premise, sand box structure should be simple and lightweight. ④ flask positioning means and with the choice of tolerance, should ensure the dimensional accuracy of the casting requirements. ⑤ sand box wall, want to bring the structures in favor of strong sand, and with the sand there is sufficient adhesion so that sand in flip close box during lifting off sand or less prone to collapse box, easy to rise in the pouring box, and To facilitate casting off the sand. ⑥ medium and large sand boxes wall vent should be located so that exhaust gas generated when pouring. LFC sand box layer requires better ventilation, better sealing outer requirements, special requirements make it very complicated structure, making trouble, as long as there is a little sloppy places, sand box sales, production sand box into production, production The castings will have a variety of problems, such as the collapse box, sand box Supply, porosity, Zhucheng sand box, shrinkage, etc., so, sand box also disappeared one casting equipment critical equipment. Sand box | Dragon Industrial (certified) | sandbox provided by Shandong Zhucheng Dragon Development Co., Ltd 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.