A method of surface treatment after making resin sand core

Abstract

The invention belongs to the technical field of mold manufacturing, and particularly relates to a surface treatment method for a manufactured and molded resin sand core. The method is used for spraying a mold release agent on the surface of the cylindrical resin sand core, and cooperated with a surface treatment machine for the manufactured and molded resin sand core to finish operation. The method comprises the following steps that 1, the core is installed, and particularly the core is vertically fixedly placed on a base and fixed by a fixing mechanism; 2, the mold release agent is sprayed, and particularly a spraying mechanism is driven by a reciprocating motor for spraying; 3, a gap is filled, and particularly through air pump pressurization, the mold release agent is permeated into thegap in the surface of the core; 4, the mold release agent is flattened, and particularly the reciprocating motor drives the spraying mechanism to flatten the mold release agent; and 5, the core is rotated, and particularly a guide groove and a rotary adjusting mechanism are matched to drive the core to rotate. The uniformity of the thickness of the mold release agent on the surface of the core isimproved, the surface smoothness of the mold release agent on the outermost layer is improved, and casting size precision is improved.

Description

technical field [0001] The invention belongs to the technical field of mold manufacturing, and in particular relates to a method for treating the surface of a resin sand core after molding. Background technique [0002] The core is used to form the internal structure of the casting during casting, and is usually hand-made or machine-made in a core box using raw sand and binder. The core is installed in the mold before casting, the molten metal is poured and condensed, and the core is removed when the sand is released to form a cavity in the casting. Resin sand core refers to the core with artificial synthetic resin as the sand binder; after the core is made of resin sand, through the action of curing agent, the resin undergoes an irreversible cross-linking reaction and solidifies, thus giving the core the necessary strength . After the resin sand core is manufactured, it is necessary to spray a layer of release agent on the surface, so that the cured and molded product can...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for surface treatment of resin sand core after molding, aiming to solve the following problems existing in the current spraying of the surface of the core: (1) It is difficult to guarantee The distance between the outlet of the sprayer and the surface of the core is constant, which will easily lead to uneven thickness of the release agent on the surface of the core, resulting in bonding between the core and the casting during demoulding, and even resulting in a reduction in the dimensional accuracy of the casting; When the release agent is sprayed on the surface, it is difficult to ensure that the speed of the relative movement between the sprayer and the surface of the core remains constant, which will also lead to uneven thickness of the release agent on the surface of the core

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