Blank box molding sand is an important part, so how about the requirements of the blank has, will affect the use of the effect, 1) rough casting sand box size deviation, wall thickness deviation according to GB / T6414-1999 casting dimensional tolerances specified level of selection. There are special requirements for dimensional variations, should be separately identified. 2) machined separately handle, hanging shaft, or inserted into the rings cast housing portion and cabinet should be tightly connected defect Tai'an sand box, do not allow loose and influential strength. 3) should cast the mark on the flask. Special sandbox can cast the part number, sand box drawing number, can be cast by a sand box sand inside the box factory × width × height dimensions. 4) eliminate internal stress treatment, post-treatment retention of flex and deform, should be within the allowance range, beyond those allowed to be corrected with special means, 5) sand box used for clamping down sand box The wedge, which shift and deviation should not exceed the specified size requirements. Source: blank is an important part of the flask shaped flask EPC technology first made by EPC foam model craft, sand box model, hanging special paint coating, sand box sales dry sand placed in a special box, Fill with dry sand, three-dimensional vibration compaction, the vacuum state, casting, model gasification disappear, metal replacement model, sand box manufacturers, to replicate the same with the foam mold casting, the vacuum is released after condensation, remove from loose sand casting, sand box next cycle of production _ Dragon Industrial (certified) _ Tai'an sandbox 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.