The greater the amount of deformation of the flask, after unloading sand walls of the box so that the greater portion of the displacement of the center of the tank, which can cause distortion or cracking sand, couch box, to achieve normal unmoulding cause difficulties, so some plants When you look shock compression molding machine applications change in pressure molding, cast out of the casting wall thickness, weight loss phenomenon appears. Therefore, the deformation of the side wall of the flask must be limited to the extent permitted. Foundry sand box, sandbox EPC casting a negative pressure system is actually a vacuum unit, vacuum pump and a variety of main tanks, pipes, gas distributor and electrical control system, the specific function for the regulator, consider gas , dust distribution in addition to smoke, gas, gas water separation, gas separation miscellaneous functions. EPC also known as vacuum solid casting, if there is no vacuum, then it can not be called a lost foam casting process, and its principle is to make the vibration sand compaction, sand box specifications, then sucked dry sand under vacuum attachment and cast. So as to make the foam model fixed compaction, Yantai sand box, and the vapor vent cavity, thereby casting a no quality casting porosity, trachoma, shrinkage, shrinkage and other defects, which is the main role of a negative pressure system. Yantai sand box, Dragon Holdings, sand box sales provided by the Industrial Development Co., Ltd. Shandong dragon. Yantai sand box, Dragon Holdings, sand box sales Shandong dragon Development Co., Ltd. (www.julongshiye.com/) this year introduced a new upgrade, the above picture is for reference only, please call the contact picture on this page or telephone obtain the latest information, contact: Mr. Wang.