Casting technology for lead-free brass tap

Abstract

The invention provides a casting technology for a lead-free brass tap, which the advantages that the flowing distance of products in the pouring process is short, simultaneous solidification is realized, and hot cracks are reduced; the die has excellent heat balance effect, is favorable to the heat balance of the products and reduces stress micro-cracks during cooling. The casting technology comprises the step of casting-molding lead-free brass fluid through a gravity casting device, wherein the gravity casting device comprises an upper half die, a lower half die and a sand core, die cavities fitted with the shape of a tap body are respectively correspondingly arranged between the upper half die and the lower half die, the sand core is arranged in the die cavities between the upper half die and the lower half die, the shape of the sand core is matched with the shape of a water-in part, a water-out part and an inner cavity of a valve core mounting part of the tap body, pouring cavities are formed between the sand core and the die cavities, a gate for allowing lead-free melt copper to be poured is further formed in the upper half die or the lower half die, the gate is connected with the pouring cavities, the gate is provided with an inner gate and an outer gate, and the inner gate is correspondingly arranged at the pouring cavity part for molding the valve core mounting part of the tap body.

Description

technical field [0001] The invention relates to the technical field of faucet casting, in particular to a casting process of a lead-free brass faucet. Background technique [0002] In daily life, the faucet is a valve switch used to control the size of the water flow. The faucet is a product with a relatively complicated appearance and structure, so the faucet body is generally formed integrally through the casting process. The casting mold is a part of the casting tooling. The necessary gear to shape and obtain the desired casting. [0003] Such as figure 1 , the casting mold used for the casting process of the existing lead brass faucets generally includes an upper half-mold and a lower half-mold 2', and a sand core 3' is provided between the upper half-mold and the lower half-mold 2', and the lower half-mold The parting surface of 2' is provided with gate 4', the gate of this type of casting mold is set on one side of the lower half-mold 2', and poured from the rear of ...

AI Technical Summary

Problems solved by technology

In this patent, the inner gate of the gate is correspondingly arranged at the pouring cavity for forming the water inlet part of the faucet body. When pouring, liquid metal is poured from the outside of the water inlet part, and the liquid metal flows to the water inlet part of the product to the valve core. From the installation part to the water outlet part, in this pouring method, when the liquid metal is poured to the valve core installation part of the product, it suddenly turns, so that the flow resistance of the liquid metal suddenly increases, so this pouring method is also not conducive to the rapid filling of the mold cavity by the liquid metal, and the product solidifies At the same time, the temperature of each part of the water inlet, water outlet and valve core installation part is unbalanced, and it cannot be solidified at the same time. The problem that the temperature of each part of the product is not uniform and cannot be cooled at the same time, the patent sets an overflow tank in the thick part of the mold, so that the overflowing metal liquid can be heated to the place, so that the temperature of each part of the mold is uniform, which is conducive to the cooling of all parts of the mold Thermal balance, thereby reducing the temperature difference across the product, allowing all parts of the product to cool at the same time, avoiding thermal cracks, although the mold can reduce the problem of thermal balance to a certain extent, but the setting of the overflow tank makes the mold structure relatively complicated , the manufacturing cost is high, and the overflow block 42 will also be formed at each overflow groove when the product is formed (see the attached patent specification for details) figure 2 ), the automatically formed overflow block increases the material cost and processing cost of the faucet body a lot, and also increases the workload of subsequent product finishing

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