The use of pneumatic or hydraulic pressure is applied by the indenter or look for sand box sand to sand compaction. Its pressure is generally 0.25 to 0.4 MPa. This molding machine so far away from the surface of the sand compaction pressure difference. The early 1950s there have been high-pressure molding machine, pressure sand on the plane at 0.7 MPa or more. High pressure molding machine ram into flat indenter, shaped indenter and several forms of multi-class structure of the contact pressure. Among the high-pressure molding machine more than the most widely used contacts. Multi-contact high-pressure molding machine head up and down movement is divided into many small squares ── contacts, get a lot of press strength by a hydraulic cylinder. Compacted, the contacts following their appearance height is applied (ie pressurized sand thickness) of the corresponding pressure on the sand to get a high, uniform firmness and hardness. Such molding machines are equipped with micro-local earthquake hit agencies that can adapt to the complex pattern of shapes. Multi-contact high-pressure molding machine uses four-column structure, a single-station type and duplex style. In order to adapt to the small batch production of castings, this model machine with template changer, replace the template, shape does not have to stop. High pressure more contact modeling, sand casting can be poured out of thin walled, precise size, smooth surface of the casting. For the manufacture of sand casting equipment. Its main functions are: filling sand, loose sand to fill sand box; tight sand, through the tap, compaction, different methods of shock pressure, injection pressure and other so loose sand box sand compaction, making sand has the necessary strength in handling and casting and other processes; from the model, using different agencies will look removed from the sand after the compaction http://www.hbjixinjx.com http://www.jgmoju.com