Die casting head heat-preservation device for gravity casting and pouring

Abstract

The present invention belongs to the field of casting apparatus, and is especially one heat insulating and feeding unit for gravitationally casting hard casting head. The present invention features that the hard casting head of cast iron is provided with several downward extending blind holes filled with heat insulating material in the wall, heat insulating material painted to the inner wall and heat insulating material covering the outer wall. The casting head has the features of high heat insulating effect, high feeding effect, and low cost.

Description

technical field [0001] The invention belongs to the field of pouring equipment, and in particular relates to a heat preservation device capable of heat preservation and feeding for a die riser of gravity casting. Background technique [0002] In the foundry field, the riser is mainly used for exhaust, feeding and slag collection. That is, the gas in the cavity and most of the gas in various sand cores and molten metal are discharged from the riser; the molten metal after each part of the casting shrinks is replenished by the riser; metal oxide slag entering the cavity, etc. Float up into the riser. After the casting is completed, the riser needs to be sawed off to obtain a casting with a good internal structure. [0003] The risers used in casting include sand core risers and hard mold risers. Sand core risers made of coated sand are very effective in venting and feeding, so they are widely used in gravity casting. However, since each casting must use a sand core riser, t...

AI Technical Summary

Problems solved by technology

Sand core risers made of coated sand are very effective in venting and feeding, so they are widely used in gravity casting. However, since each casting must use a sand core riser, the used sand core riser It cannot be reused, so it has the following disadvantages: (1), it takes a lot of coated sand to produce a large number of sand core risers; (2), it not only consumes a lot of water, electricity and natural gas when the coated sand is made into sand core risers , and requires core-making machines, core box molds, labor hours and other costs; (3), the strength of the sand core is limited, and castings that are flipped and poured are prone to problems such as sand-out defects and sand core crushing; (4), using The used sand cores can only be thrown away as waste sand, but the waste sand contains a lot of resin, which is very polluting to the environment

Although the die riser can be reused, the life of a pair of die riser is 500,000 to 600,000 times; it has the advantages of cost saving, no pollution, no damage, and sand falling defects, but because the die riser is made of metal material , has the disadvantages of fast heat dissipation and poor feeding, and cannot meet the process requirements of castings produced under gravity casting conditions

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