Principles of foundry sand box sand core production division side should be selected in accordance with: (1) as far as possible when casting sand box sand core production sub-surface and sub-surface sand box unanimous, sand box, in order to ensure the sand core from the mold consistent with the size and direction of the draft angle of inclination and appearance to ensure a uniform thickness of the casting; (2) the production of foundry sand box straight points should be given priority with box, sand box sales, sometimes in order to fit the shape of the sand core can use surface or sub-surface folding box; (3) the production of foundry sand box should have a greater filling open face, is conducive to sand core and tight, and easy to use and set up sand cores mounted core gas path; (4) as much as possible when casting sand core production of dry sand box support surface is a plane, in order to simplify the drying board structure, increase drying plate universal; (5) foundry sand box make possible the size requirements of high partial discharge In the same piece of the core box to avoid being divided with box segmentation; (6) foundry sand box should be the core box making simple structure, sand box size, easy to manufacture, easy to operate system core, and to meet the accuracy requirements of the sand core size . Priority using sand casting According to statistics, China's or the international level, in all casting production in the 60 to 70% sand casting is produced, and in which about 70% is clay sand production. The main reason is casting sand casting method than other low-cost, simple production process, short production cycle. So like a car engine cylinder block, cylinder head, crankshaft, etc. are used green sand casting process of production. When the wet type can not meet the requirements to consider the use of clay sand is dry sand, dry sand or other sand. Green sand casting casting weight from a few kilograms up to several tens of kilograms, while dry clay can produce castings weighing dozens of tons. Sand box, Dragon Holdings, sand box manufacturers to provide the Industrial Development Co., Ltd. Shandong dragon. Sand box, Dragon Holdings, 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 the telephone or pictures on this page obtain the latest information, contact: Mr. Wang.