Manufacturing method of sand leaking preventing and heat preserving feed head of sand casting and special die thereof

Abstract

The invention discloses a manufacturing method of a sand leaking preventing and heat preserving feed head of a sand casting and a special die of the manufacturing method. The manufacturing method is that a sand leakage preventing platform is arranged between a feed head die seat and a feed head air outlet bar, and the bottom part of the sand leakage preventing platform completely covers a feed head air outlet hole in the top part of a feed head heat preserving sleeve which is used in match with the feed head die seat; when manufacturing the feed head, a space formed by the feed head air outlet bar is used as a sand air outlet hole, the space formed by the sand leakage preventing platform is used as a transition exhausting chamber, and the space formed by the feed head die seat is used as a casting solution compensating contraction chamber; the feed head heat preserving sleeve is embedded into the casting solution compensating compaction chamber; the feed head air outlet hole in the top part of the feed head heat preserving sleeve is completely staggered with the sand air outlet hole in the vertical direction, namely, the casting solution compensating compaction chamber, the transition exhausting chamber and the sand air outlet hole can communicate by curved lines in a circuitous way. The manufacturing method has the advantages that the optimal structural design and layout ensures smooth exhausting from the prepared feed head, and casting sand which is loosened by vibrating can be prevented from entering a cavity of a casting body, and therefore, the defect due to sand inclusion of the casting can be effectively decreased, and the casting quality can be greatly improved.

Description

technical field [0001] The invention relates to the design technology of a riser of a casting part using clay sand molding, in particular to a method for making a leak-proof sand heat preservation riser of a sand casting and a special mold thereof. Background technique [0002] The foundry industry plays a pivotal role in promoting the development of the national economy. At present, my country's casting output is increasing year by year, and the output of sand castings accounts for more than 80% of the entire casting output. Riser production is an essential link in the production process of sand castings. A riser is a supplementary part added to the top or side of a casting to avoid casting defects. Generally speaking, the riser is a cavity for storing liquid metal. It supplies metal when the casting is formed. Its main function is to feed shrinkage, and it also has the functions of preventing shrinkage cavity, shrinkage porosity, exhaust, and slag collection. [0003] T...

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Problems solved by technology

[0005] But, there is following defect in the design of above-mentioned riser mold: its riser mold base 2 and riser air outlet rod 1 are close to adjacent in the riser manufacturing process, and sand mold air outlet 3 and riser air outlet 4 in the gained riser sand mold direct overlap

However, in the process of boxing, transporting, clamping or casting of riser sand molds, large and small vibrations and shaking will inevitably occur, and the loose sand 6 on the surface of the sand mold is very easy to arrange sand outlet holes 3 along a straight line. , Riser vent 4 and casting solution feeding cavity 7 fall into the cavity of the casting body, causing sand inclusion defects in the casting, which not only greatly increases the cleaning workload, but even causes the scrapping of the casting in severe cases

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