Lost foam pattern hole groove pre-embedding process

Abstract

The invention relates to a lost foam pattern hole groove pre-embedding process. The lost foam pattern hole groove pre-embedding process comprises the following steps that (1) special paint is brushedon the surface of a lost foam pattern with hole grooves; (2) drying is connected in a drying room; (3) the ceramsite or chromite powder is added into phenolic resin to prepare resin sand powder; (4) the surface of the pattern hole slot coating is filled with the resin sand powder in a compacting manner, and the pattern hole slot coating is dried in a drying room; and (5) after the filled resin sand is dried and cured, boxing molding and casting are carried out, and a casting is formed. The lost foam pattern hole groove pre-embedding process has the beneficial effects that dry sand at the holegrooves in special positions is filled with the resin sand powder to be compact, the paint on the surface of the lost foam pattern can be provided with supporting strength, after molten steel is poured, the paint at the hole grooves cannot be damaged under the action of high temperature, the sand burning defect formed on the surface of the casting after the molten steel seeps is avoided, manual follow-up grinding is not needed, and the yield is increased.

Description

technical field [0001] The invention relates to a lost foam casting process, in particular to a pre-embedded process of a lost foam white mold hole groove. Background technique [0002] Lost foam casting is to put the white mold with paint on the surface and dry it in dry sand, vibrate it on the vibrating table, solidify it under the action of negative pressure and vacuum, and then cast molten steel. [0003] Due to the limited fluidity of the dry sand, the dry sand in the holes and grooves in special positions cannot be filled tightly, and the paint on the surface of the white mold cannot be given support strength, resulting in damage to the paint in the holes and grooves under high temperature after pouring molten steel , After the molten steel seeps out, sand sticky defects are formed on the surface of the casting. [0004] Sticky sand is generally iron-clad sand, which is very difficult to handle, which greatly increases the workload of grinding, and sometimes leads to ...

AI Technical Summary

Problems solved by technology

[0003] Due to the limited fluidity of the dry sand, the dry sand in the holes and grooves in special positions cannot be filled tightly, and the paint on the surface of the white mold cannot be given support strength, resulting in damage to the paint in the holes and grooves under high temperature after pouring molten steel ,