History of sand molding machines
In 1890, a shock-type sand molding machine appeared, which improved the modeling efficiency and sand accuracy. According to the method of compacting sand, it can be divided into compaction, compaction, seismic, injection and sand blasting machines. Used in the manufacture of sand casting equipment. Its main function is: sand filling, filling loose sand into the sand box; compact sand, through the compaction, compression molding machine, vibration, injection pressure and other different methods to make the loose sand in the sand box tight, The sand mold has the necessary strength in the process of handling and casting; the mold is taken out, and the pattern is taken out from the compacted sand mold by using different mechanisms. It first appeared in the mid-19th century. In the early days, it was a simple manual compaction belt demoulding mechanism, which later used compressed air as the power for compacting and compacting sand.
The working principle of the sand molding machine is to use the air pressure or hydraulic pressure to apply pressure to the molding sand in the sand box through the indenter or the pattern to compact the molding sand. Its pressure is generally 0.25 to 0.4 MPa. This type of molding machine makes the sand type tightness away from the pressure applying surface. A high-pressure molding machine appeared in the early 1950s, and the pressure on the sand plane was above 0.7 MPa. The pressure head of the high-pressure molding machine is divided into several structural forms such as a flat pressing head, a forming indenter and a multi-contact indenter. Among them, high voltage multi-contact is the most widely used. The high-pressure multi-contact molding machine head is divided into a number of small squares that can move up and down—contacts, which can obtain a large compressive strength through hydraulic cylinders. In real time, each contact applies a corresponding pressure according to the height of the pattern below it (ie, the thickness of the pressed sand layer), so that the sand type is obtained high and uniform.
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