There are basically two types of iron sand-coated molding lines commonly used in foundry production. One is a simple molding line; the other is a semi-automatic molding line. The simple molding line has low investment and strong applicability, but it has the disadvantages of high labor intensity, poor working environment and large number of people. With the development of iron sand coating technology, this process has been more and more widely used in casting production enterprises such as crankshafts, grinding balls and other industries. In recent years, through continuous research on the process by scientific research units and production enterprises, the automation of the iron-type sand-coated production line is getting higher and higher, the layout is more reasonable, and the process is smoother.
Simple molding line
The layout of a common iron-type sand-coated simple molding line is shown in Figure 8. The simple line has the advantages of less equipment, small investment, simple and smooth production line and strong adaptability to different product iron type lengths, but there are also
The following disadvantages.
- The raceway of the production line is a non-motorized raceway. All the iron molds must be moved manually. Due to the heavy weight and high temperature of the iron molds, the labor intensity and working conditions of the workers are very poor.
- The casting is poured on the raceway. The splashing of molten iron and frequent fire escape not only make the whole site splashed with iron beans, but also make people easily burned and worsen the working environment. At the same time, the overflow of molten iron is very easy to roll. Dao’s wheels stuck and couldn’t work properly. In order to reduce the labor intensity of workers, some equipment manufacturers design large hydraulic cylinders at both ends of the casting raceway to push the mold, which requiresThe length of the integer mold must be equal to the length of the raceway of the pouring section, which brings a lot of inconvenience to the production; when the mold moves, it is the box-top box, which can easily cause the casting to be wrong.
- The castings from the casting station are stacked near the equipment and transported away after reaching a certain amount. The flying sand and high temperature of the castings, especially in summer, the working conditions are quite bad. At the same time, the transportation of castings is also difficult.
Semi-automatic molding line
The commonly used layout of semi-automatic molding line is shown in Figure 10. The single equipment of this molding line is controlled by proximity switches or photoelectric switches, and the entire line is controlled by multiple PLCs, which has a relatively high degree of automation. But there are also the following shortcomings.
- The cumbersome process route affects production efficiency.
- The height of the iron mold is too low from the ground, and the ladle is too far away from the sprue cup. It is difficult to pour when pouring, especially when the full ladle just starts pouring; the molds are poured one by one through the movement of the ladle, and the molten iron during pouring Splashes destroy the working environment.
- The conveyance of the mold must be stopped during pouring, and some of the front-end processes must also be stopped, and continuous operation cannot be performed, which affects the production efficiency.
- The molds made of different products in the two modeling sections should be placed on the same pouring section, because it is impossible to arrange one type and then another in the production process, and the two types are often mixed. If the materials of the two varieties are different or other requirements for molten iron such as pouring temperature are different, it is impossible to achieve simultaneous production of two products.