Rapid dewaxing kettle

Abstract

The invention relates to a dewaxing kettle belonging to the precise casting field. A problem to be solved is providing a rapid dewaxing kettle realizing no expansion of the wax mould. A technical scheme adopted in the invention for solving the above problem is characterized in that the rapid dewaxing kettle comprises a heat insulation layer, an outer container, an inner container, heating tubes and a wax recovery pipeline, the inner container is positioned in the middle of the outer container, the heating tubes are positioned between the outer container and the inner container, and the volume ratio of the outer container to the inner container is equal to or greater than 1.6:1, and preferably 1.75:1. By adopting the above technical scheme, the work pressure of the dewaxing kettle is 8kg / 5s, the pressure climbing time is improved 2.6 times, the precisions of workpieces are stable, and the work efficiency is improved by 15%.

Description

technical field [0001] The invention relates to a precision casting tool, in particular to a dewaxing kettle for precision casting mold dewaxing. Background technique [0002] In the prior art, the dewaxing kettle includes an outer tank, an inner tank, and a heating pipe between the outer tank and the inner tank, the outer tank is a steam generation area, and the inner tank is a working area. When working, first add a certain amount of water into the outer tank, and then heat the water in the outer tank through the heating tube to generate steam, then open the steam inlet valve, and the steam will enter the inner tank through the steam inlet pipe, and supply the water to the working area. The mold provides higher vapor pressure and temperature. At present, the standard part of the dewaxing kettle is φ100*140cm, the inner tank is 80*120cm, the volume ratio of the outer tank and the inner tank is 1.82:1, and the working pressure of the dewaxing kettle with this structure is ...

AI Technical Summary

Problems solved by technology

At present, the standard part of the dewaxing kettle is φ100*140cm, the inner tank is 80*120cm, the volume ratio of the outer tank and the inner tank is 1.82:1, and the working pressure of the dewaxing kettle with this structure is 8 seconds 5kg, 8kg in 13 seconds, the entire pressure rise time is too long, the melting speed of the wax is slow, the volume expansion of the wax from solid to liquid is easy to cause the shell mold to swell, and the cracking of the shell mold will seriously affect the surface quality of the casting. After pouring, the surface of the casting will have cracks caused by liquid steel flowing into the crack at the cracked part. The light one needs to be polished and repaired, and the serious one will cause the casting to be scrapped.

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