Sand mold rotary gravity mould and casting method thereof

Abstract

The invention relates to a sand mold rotary gravity mould and a casting method thereof. The mould comprises an inner structure sand core and an exterior sand mold gravity mould, wherein the exterior sand mold gravity mould comprises resin, curing agent and crude sand. The casting method includes the following steps: (1) a sand core mould comprising the inner structure sand core and the exterior sand mold gravity mould is well installed on a sand core machine; (2) the sand is mixed: resin, curing agent and crude sand; (3) the mould is heated: according to the structural sizes of the sand core and the sand mold, the mould is warmed to a proper curing temperature to manufacture the core and the mold, and residual parts on the sand core are scraped; (4) the inner structure sand core is arranged in the exterior sand mold gravity mould according to a positioning head, and rotary casting is carried out in the mode of front casting or lateral casting after mould closing; (5) after casting, the cast is taken out from the exterior sand mold gravity mould, and the time of taking the cast is determined according to the curing states of the dead head of the cast and a thicker part; and (6) the cast is processed by slinging and shot blasting. The invention can avoid the disadvantages of the traditional casting method, and has the advantages of low material consumption and lower cost.

Description

technical field [0001] The invention relates to a sand type rotary gravity mold and a casting method thereof, belonging to the technical field of casting. Background technique [0002] At present, in the bathroom faucet industry, there are three casting technologies to produce faucet castings, namely gravity casting, low pressure casting and clay sand casting. However, these three casting techniques all have defects in varying degrees (such as many consumables and high costs). [0003] Gravity casting and low-pressure casting: 1. The shape molds are made of metal materials (commonly used materials: A3 steel, No. 45 steel, red copper, beryllium copper, etc.), and metal molds are not conducive to exhaust during casting, making the castings There are more pores, and to improve the problem of pores will greatly increase the difficulty of designers and producers. More importantly, the metal mold has strong thermal conductivity. When the alloy copper liquid is injected into the ...

AI Technical Summary

Problems solved by technology

This technology has a high cost and consumes a lot of raw materials (because the products are all copper)

2. When the metal mold is in normal production, the mold temperature must reach above 185 degrees, which increases the difficulty of the operator's work and destroys the working environment (easy to burn)

3. Every time a casting is cast, the mold must be cleaned once, and at the same time, a foam mold must be carried out (this process is not only cumbersome, but more importantly, the graphite water used in the foam mold is very dusty, which makes the environment of the entire foundry workshop and even the entire factory area It has been greatly damaged and polluted, which is quite detrimental to the physical and mental health of workers)

2. Since the shape of the casting is not completely uniform and the roughness is large, it is not convenient for processing with uniform fixtures

3. The surface roughness is large, the grinding and polishing allowance is increased, the product is easy to be polished and deformed, the manpower and material costs of grinding and polishing are increased, and the efficiency is low

4. Clay should contain about 8% water when molding, which reduces the fluidity of alloy copper during casting

5. Clay sand mold casting takes up a lot of space, low production efficiency and large dust

However, this patent is cumbersome in terms of operation process, because it requires the combination of metal outer mold and sand core outer mold and sand core, and casting can only be carried out after the mold is closed.

Secondly, the temperature of the metal exterior mold is over 100 degrees during work, the operator is easy to be burned, and the operation safety is low

Moreover, the sprue mouth, overflow groove and riser on the casting mold are set on the metal outer mold. When the solution is poured into the metal sprue mouth, the metal sprue mouth will quickly transfer heat, so the temperature of the solution is reduced and the temperature of the solution is affected. fluidity

If the fluidity is poor, it is difficult to make thin castings; when the fluidity of the solution slows down, the castings are difficult to punch, and defects such as cold shuts, pores, and slag inclusions are prone to occur

Images