Technology for manufacturing mold core by using steel molding sand

Abstract

The invention discloses a technology for manufacturing a mold core by using steel molding sand. The technology comprises the following steps: (1) coating the surface of a steel ball with phenolic resin, a curing agent and a lubricating agent so as to prepare the steel molding sand; (2) preparing a steel sand core part by using the steel molding sand according to a conventional sand core production method; (3) placing the steel sand core on a pre-processed location of an integral mold, and carrying out precoated sand core shooting, so that the steel sand core and a precoated sand core are combined so as to form the integral sand core. According to the technology, the steel sand core and the precoated sand core are combined so as to mold and manufacture the mold core; the steel sand core has high heat conductivity coefficient, is capable of increasing the speed of molten iron solidification and accelerating the solidification of molten iron around the steel sand core and replaces a chilling block; the combination of the steel sand core and the precoated sand core is capable of ensuring the uniform cooling speed of each part of a casting and improving the quality of the casting. In addition, the steel sand core has good collapsibility, is particularly suitable for a cavity in the casting and is easy to crush and outflow.

Description

Technical field: [0001] The invention relates to a process method for manufacturing a composite core by using novel steel molding sand and coated sand. Background technique: [0002] At present, the general core-making process is to use coated sand to make the required sand core by hand or core shooting machine, and the sand core matches the shape to cast various castings. The core shooter uses compressed air to evenly inject the coated sand into the sand box for pre-compaction, and then apply pressure for compaction. The coated sand mainly uses high-quality selected natural quartz sand as raw sand, and the surface of the raw sand is coated with thermoplastic phenolic resin, urotropine and reinforcing agents. The coating material can be adjusted appropriately in terms of curing speed, release property, fluidity, collapsibility, casting surface finish, storage, etc. according to the different technical needs of users. The thermal conductivity of this kind of coated sand is low. ...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the low thermal conductivity of the existing cores made of coated sand and needs to be equipped with cooling irons, etc., and provides a process for manufacturing cores using steel molding sand with high thermal conductivity, fast heat dissipation and no need for cooling irons

Images