What are the key points of PVC pipe mold installation?

The structure of the pipe die used in the production of UPVC solid wall pipe by twin-screw extruder is roughly the same, which is generally composed of front die, bracket, back mold, splitter shuttle, die, mandrel, etc. the function of the die is to pass the melted plastic melt with certain pressure continuously provided by the extruder into the die through its specific flow channel to form a tube embryo with annular cross-section, which is then cooled and shaped Get the required pipe material.

1、 Key points of mold installation:

When grinding the mould, metallographic fine sand should be used. In case of serious corrosion, the rust can be removed by water grinding, and then the fine sandpaper or polishing machine can be used for polishing. The bracket should be polished thoroughly, and there should be no dead angle to prevent yellow line. The joint of the mold should be smooth and smooth without burr and dead angle. The screw hole of the mold should be cleaned regularly to prevent molybdenum disulfide carbonization and the screw is not easy to remove Installation;

Upper mold: before the mold is installed on the machine, it is necessary to prepare the tools and some necessary articles, whether the filter plate should be added with copper sheet, the belt and iron chain used for hanging the mold should be checked to see if they are in good condition, and the lifting mode should be horizontal. The foot and other parts of the body should not be under the mold, and the thermocouple hole should be at the top;

Before installing the mold, the mark should be found first, and then the assembly should be carried out according to the mark. Attention must be paid to the safety during the assembly process. The crane should be used carefully and the action should be light to avoid personal injury and mold damage. When installing the screw, each bolt, thread and hardness should be checked. For the bad screw, replace it in time, and apply appropriate amount of molybdenum disulfide on each screw;

Tightening the mold: before starting the machine, tighten the bolts of the mold. When tightening the bolts, first tighten the screws of the mold base, and then tighten the pressing plate. When tightening the bolts, one person is required to tighten the bolts diagonally with even force.

2、 Precautions for selection of pipe mould:

In the first mock exam, the production speed is relatively fast. So when the mandrel is selected, the medium mandrel is usually used as a lightweight pipe for heavy duty mandrel.

Single out can also adopt double out method, and the smallest diameter can be selected from many mandrels;

The drainage pipe mold is usually a special mold.