Cast steel impeller die with bottom thermal center feeding and moulding pouring die

Abstract

The invention relates to the technical field of casting dies, and in particular relates to a cast steel impeller die with a bottom thermal center feeding and moulding pouring die. The die is provided with an impeller die and a straight pouring die. The die is characterized in that the thermal center feeding and moulding pouring die is arranged outside a bottom wheel hub of the impeller die. The moulding pouring die consists of a bottom transverse pouring die and a side pouring die. One end of the bottom transverse pouring die is provided with a concave face matched with the outer circle of the bottom wheel hub of the impeller die while the other end is fixedly connected with the side pouring die in a crossing manner. The thickness of the bottom transverse pouring die gradually increases from the concave face end to the other end, and the width thereof increases too. With the adoption of the structure, the cast steel impeller die with the bottom thermal center feeding and moulding pouring die has the advantages of simple structure, simple process, high casting quality, low rejection rate and the like.

Description

technical field [0001] The invention relates to the technical field of casting molds, in particular to a cast steel impeller mold of a water pump with a bottom hot section feeding mold. Background technique [0002] The shape of the impeller blade used in the water pump is distorted. The impeller is generally made of cast iron or cast steel. It usually adopts sand casting process or investment casting process. The workpiece is not allowed to have casting defects such as shrinkage cavity, shrinkage porosity, air hole and sand hole during the casting process. , because the hub of the impeller is thick and the blades are thin, the method of vertical pouring is adopted in the overall casting, and the thick and large hub at the bottom is finally solidified by setting a feeder at the top to make the upper structure dense, but the solidification at the bottom is the last Due to the inability to take feeding measures for thick and large hub hot joints, the metal liquid cannot be fe...

AI Technical Summary

Problems solved by technology

[0002] The shape of the impeller blade used in the water pump is distorted. The impeller is generally made of cast iron or cast steel. It usually adopts sand casting process or investment casting process. The workpiece is not allowed to have casting defects such as shrinkage cavity, shrinkage porosity, air hole and sand hole during the casting process. , because the hub of the impeller is thick and the blades are thin, the method of vertical pouring is adopted in the overall casting, and the thick and large hub at the bottom is finally solidified by setting a feeder at the top to make the upper structure dense, but the solidification at the bottom is the last The hot section of the thick and large hub cannot be fed by the metal liquid because of the inability to take feeding measures, resulting in the final formation of casting defects such as shrinkage cavities, shrinkage porosity, sand holes or pores

In order to promote the compactness of the casting structure at the bottom hub and prevent casting defects, some castings are poured with molten metal to cool the lower part of the casting first, and an external chiller is set at the hot spot of the bottom hub to make it have a chilling effect, but using cold The iron can not achieve the ideal effect, resulting in shrinkage and loosening of the sealing ring between the impeller hub and the blade, and at the bottom of the impeller; the blade has casting defects such as cold shut and fire

Images