The problem and solution of incorrect boxes in the fully automatic horizontal molding machine for casting

The problem and solution of incorrect boxes in the fully automatic horizontal molding machine for casting:

1. Misalignment of mold plates: In the process of casting process design, due to structural issues of the casting itself, it is not possible to ensure the determination of the parting surface. Principle 1: Try to place all or most of the castings in the same box as much as possible to reduce misalignment; Therefore, during the design process, it is necessary to divide the mold and have it in both the upper and lower boxes; Even three box or multi box designs are available. During the mold production process, if the production level is not high or the mold assembly level is not high, it is easy to cause the mold plate to be misaligned. All the required boards for the fully automatic horizontal molding machine are double-sided boards. The two sides of the board separate the upper and lower boxes of the model. In design, the model is not truly separated, but is only separated from the parting surface. After production is completed, the entire model is embedded on the board, so that there is no misalignment of the model, thus avoiding the problem of misalignment of the board. However, this approach is relatively easy to implement compared to smaller models, but for larger models, it is also necessary to consider the optimization design of positioning pins when assembling the molding plate and mold.

2. The conical positioning pin is bonded with sand blocks: The automatic horizontal molding machine has a special design, which is the conical positioning pin positioning, which is convenient for replacing the template. The template does not need to be fixed. To replace the template, you only need to lift down the used template and replace it with a new one, which can be enlarged on the template holder. The template replacement is very fast. However, if the conical positioning pin surface is not cleaned in a timely manner, it is prone to sand sticking. During molding, due to poor sand blowing during the upper and lower box mold assembly, there is floating sand on the positioning pin surface. The upper and lower boxes are not tightly packed, leaving gaps, and the molding plate is not parallel to the upper and lower sand boxes, resulting in misalignment. The fully automatic horizontal molding model has sand blocks stuck on the board, which can cause misalignment when the template and sand box are not closed properly during box closing. In order to prevent sand sticking on the conical surface of the conical positioning pin, a sand blowing device is specially installed on the molding machine. After completing each cycle, an air gun is used to blow away the floating sand.

3. Pushing too fast and causing misalignment: In general, the hydraulic power unit has stable performance, long service life, and reduced power consumption. However, in actual production processes, due to long-term use, the sealing ring of the oil cylinder is prone to aging, resulting in loose sealing. Sometimes, due to poor cooling effect of the hydraulic pump station and high oil temperature, problems are still prone to occur. During the molding process of the fully automatic horizontal molding machine, after the box closing molding is completed, the unloading cylinder first drives the unloading plate to detach the completed sand tire from the auxiliary sand box, and the sand mold plate returns to its original position. At this time, the sand tire after the box closing molding is completed needs to be transferred from the molding station to the pouring station and transported to the pouring section. If the pushing cylinder speed is too fast, the pushing plate will push the lower box sand tire to shake with the upper box sand tire and move in a wrong direction.

4. The inner wall of the casing is not cleaned thoroughly and there are sand blocks stuck: when transporting the casing onto the sand tire to be poured, the residual sand blocks on the inner wall of the casing push the sand mold to move, and the inner wall of the casing comes into direct contact with the sand mold; During pouring, due to the migration of water in the inner cavity of the sand mold at high temperatures, water droplets condense on the outer surface of the sand mold when encountering the sleeve box, which adheres to the sand ball and directly adsorbs on the inner wall of the sleeve box. Under normal circumstances, after removing the sand tire after pouring, it needs to be cleaned with a cleaner; However, after long-term use, the aging of the broom brush can cause incomplete cleaning, resulting in sand balls remaining on the inner wall of the box. When the box is placed on the sand tire, these excess sand balls can cause the sand tire to move, resulting in the use of sand mold misalignment.

5. Uneven mold lifting and inclined upper box sand tire: The fully automatic horizontal molding machine template is placed on the mold lifting frame. After the molding is completed, when the template detaches, the mold lifting support point on the mold lifting frame is not on a horizontal line, and the speed of mold lifting varies, resulting in inconsistent mold lifting height. After the mold lifting is completed, the lower box sand tire is placed flat on the transfer trolley, and the upper box sand tire is tilted; When placing the box, the box will push the sand tire of the upper box to move. In fact, this situation is similar to the situation where the upper box is not cleaned thoroughly and there are sand blocks stuck, and the final result is that the sand tires in the upper and lower boxes are misaligned.