Principles of foundry sand box sand core production division side should be selected in accordance with the: try to make (1) foundry sand box when making sub-surface sand core surface and sand sub box consistent to ensure the sand core draft angle and look like a draft angle size and in the same direction to ensure a uniform thickness of the casting; (2) foundry sand box should give priority to the production of sub box straight face, sometimes in order to fit the shape of the sand core, sand box specifications, you can use the surface or folding box surface points; (3) the production of foundry sand box should have a greater open face, filled with sand core in favor of tight, and easy to use and set up sand cores mounted core gas path; (4) foundry sand box as far as possible the production of dry sand core support surface is a plane, in order to simplify the drying board structure, sand box sales, increased drying plate universal; (5) foundry sand box will make possible a high portion size requirements on the same piece of core box to avoid being divided with box segmentation; (6) the production of foundry sand box should be the core box structure is simple, easy to manufacture, easy to operate system core, and to meet the accuracy requirements of the sand core size. The basic elements of the general flask, should also have the following characteristics: 1) sand wall boxes with higher rigidity and strength to withstand the pressure higher than the pressure of the molding machine, sunshine sand box, and keep the sand box size and accuracy . 2) sand wall boxes with a certain precision slide, positioning holes, stopper, dowels, etc., in order to complete the sand box shape, mechanized transport, positioning, flip-fitting, casting, shakeout and other functions . 3) does not have a box with sand box, sand box manufacturers, easy to automate modeling and shakeout. 4) the inside walls of sand boxes made more concave certain specifications to ensure the sandbox sand does not fall off during shipping, flips the process, does not shift. 5) The positioning accuracy of the flask should ensure the dimensional accuracy of the casting. Sand box production, Dragon Industrial (certified), sand box provided by the Shandong Rizhao dragon Industrial Development Limited. 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.