LFC sand box layer requires better ventilation, better sealing outer requirements, special requirements make it very complicated structure, making trouble, Changyi sand box, as long as there is a little sloppy place, the production of the flask into production, sand box model, production of castings will have a variety of problems, such as the collapse box, porosity, shrinkage, etc. Therefore, the flask is one of die casting equipment disappear critical equipment. Flask machining requirements 1) sand box machining allowances, according to GB / T6414-1999 mechanical allowance requirements, but also make their own determination based on casting or machining situation. 2) the processing sand box binning surface, sand box price, should pay attention to the height of the wedge, and maintain a predetermined tolerances on drawings. 3) sandbox process allows a small amount of porosity, shrinkage, sand box supply and, if necessary, without affecting the strength and the use of conditions, welding, after welding to be stress relieved. 4) pin, sleeve or bore holes should be processed by the jig to ensure dimensional deviation and verticality of the pattern on the support specified tolerances. 5) sand box casement sink hole and concentricity humpback hole with coaxial plug inspection, should be free to access. Changyi dragon Industrial sand box _ _ sand box manufacturers to provide the Industrial Development Co., Ltd. Shandong dragon. Changyi dragon Industrial sand box _ _ sand box manufacturer in Shandong dragon Development Co., Ltd. (www.julongshiye.com/) this year introduced a new upgrade, the above picture is for reference only, please call or pictures on this page contact telephone number, to obtain the latest information, contact: Mr. Wang.