Cast Iron Counterweight Keep The Liquid

Large tonnage forklift truck weight range of about 2200kg ~ 4700kg, casting weight and wall thickness, the maximum wall thickness of 330mm, the maximum size of 1730mm, Cast Iron Counterweight as shown in Figure 1. Molten iron in the cavity to keep the liquid for a long time, the mud core for a long time in the liquid metal, in high temperature environment, the core of the resin, curing agent decomposition, sand gap between the molten iron penetrate into the sand Between the resulting mud core permeability of the mechanical sticky sand. Large-tonnage heavy-duty mud-core mechanical sticky sand has not yet been effectively addressed. Normally, Cast Iron Counterweight mechanical gluing is a serious assembly hole or traction hole that requires oxygen blowing, which not only increases production costs but also reduces production Efficiency, waste a lot of manpower and material resources. Cast Iron Counterweight Through the addition of the right amount of coal in the mud, so that the large tonnage weight of the mud core mechanical sticky sand problem to a certain degree of improvement, but also for the follow-up work to reduce the amount of labor

The core of the sand filled with iron, and then sand and iron separation, Cast Iron Counterweight and then were weighed, sand and iron each accounted for about 50%. Which can be drawn from the large tonnage weight of the mud core sand is mainly due to high temperature molten iron into the mud core sand gap, molten iron and sand mechanical bonding together, solidification after the mud core can not collapse caused. Resin and curing agent in the core will be decomposed above 500 ℃. At this point, Cast Iron Counterweight the gap between the sand increases, Cast Iron Counterweight if the pouring temperature exceeds the heat resistance of the surface of the core coating temperature, high temperature molten iron will penetrate into the gap between the sand caused by sticky sand, known as mechanical sticky sand.

In addition, if the sand purity is not enough, more impurities in the high temperature of the internal components of the sand will occur between the chemical reaction, will also cause sticky sand, and large tonnage weight of the core is high temperature hot metal scouring time is longer, the internal heat Scattered slow, mud core for a long time in a high temperature environment, but also more prone to sticky sand phenomenon, this sticky sand phenomenon known as chemical sticky sand.

After the heat of coal to generate solid, liquid, Cast Iron Counterweight gas three-phase glial, the volume expansion of the glial part of the blockage of sand pores, so that the molten iron is not easy to penetrate, the generation of reducing gas diffuse around the core, the molten iron and mud Isolation, in addition, reducing the gas inside the mud core to increase the pressure, but also to a certain extent, Cast Iron Counterweight to prevent the penetration of molten iron. In addition, the volatiles of the hydrocarbons produced in the pulverized coal (mainly aromatic hydrocarbons) are pyrolyzed in the reducing atmosphere at a high temperature of 650 ° C to 1200 ° C to form a layer The glossy fine crystalline carbon, called bright carbon, has a thickness of about 10-4 mm thick, which allows the core to be free from molten iron and it is difficult to penetrate into the pores of the grit to prevent the permeability of the mud. sand