CN101569921A - Casting technique for manufacturing mold core by using resin sand - Google Patents

Abstract

The invention discloses a casting technique for manufacturing a mold core by using resin sand, which sequentially comprises the following steps: 1) liquid iron is melted down: the measured raw materials are put into a line-frequency furnace and heated to be melted into the liquid iron; 2) molding sand is sent into a dry furnace to be dried, and then put into a sand mixer and simultaneously added with phenol resin and curing agent to be mixed with the dried molding sand, wherein, the curing agent comprises phenol-based polyisocyanate and triethylamine, and the weight of the phenol resin is 10-20 times as heavy as that of the triethylamine; the mixed sand is put into a casting model machine for manufacturing the mold core; 3) after being molded, the mold core is processed by spraying, water based paint is mainly applied in the spraying treatment, and then the sprayed mold core is dried in a dryer. As the curing agent in the technique is formed by the phenol-based polyisocyanate and the triethylamine, external heating is not needed in the technique for manufacturing the core; the resin sand can be rapidly cured under the catalysis of the triethylamine, thus improving the production efficiency.

Description

A kind of casting technique with the resin sand manufacturing mold core

Technical field

The invention belongs to casting field, specifically is a kind of casting technique with the resin sand manufacturing mold core.

Background technology

The most of furan resin-sand technology that adopts of foundry's molding and core making process, binding agent is furane resins in the furan resin-sand technology, curing agent is a p-methyl benzenesulfonic acid, be by in molding sand, core sand, adding a certain amount of binding agent and curing agent, make it under certain temperature in core box or sandbox a kind of moulding, the core manufacturing craft of drying hardened forming; Mix in the system process at furan resin-sand, the addition of furane resins is generally 0.8%～1.2% of quartz sand, and sulfonic acid class curing agent addition is 30%～50% of a resin.But this furan resin-sand hardened forming needs heating, and curing rate is slow.

Summary of the invention

The purpose of this invention is to provide a kind of casting technique with the resin sand manufacturing mold core, need not external heat in the core manufacturing craft, resin sand is able to rapid curing under the catalytic action of triethylamine, has improved production efficiency.

Technical scheme of the present invention is as follows:

A kind of casting technique with the resin sand manufacturing mold core, carry out according to the following steps order:

1), molten iron is melting, the raw material that measures is dropped in the line frequency furnace, heating makes it to be fused into molten iron;

2), molding sand is sent in the drying oven dried, put into puddle mixer after the oven dry, and phenol resin, curing agent joined in the mulling processor simultaneously mix, curing agent is made up of phenolic group PIC and triethylamine, the weight of phenol resin is 10～20 times of triethylamine, mixed sand is put into the casting pattern machine, carry out the molding and core making operation;

3), to carrying out spray treatment through the core behind the molding and core making, coating is mainly water based paint, processing is dried in the back in dryer;

4), molten iron injected in the casting core pours into a mould, and carry out the nature cooling, foundry goods after knockout is handled, carries out Shot Blasting, removing surface and cutting soldering work again.

Curing agent of the present invention is made up of phenolic group PIC and triethylamine, need not external heat in the core manufacturing craft, and resin sand is able to rapid curing under the catalytic action of triethylamine, has improved production efficiency.

The specific embodiment

A kind of casting technique with the resin sand manufacturing mold core, carry out according to the following steps order:

1), molten iron is melting, the raw material that measures is dropped in the line frequency furnace, heating makes it to be fused into molten iron;

2), molding sand is sent in the drying oven dried, put into puddle mixer after the oven dry, and phenol resin, curing agent joined in the mulling processor simultaneously mix, curing agent is made up of phenolic group PIC and triethylamine, the weight of phenol resin is 10～20 times of triethylamine, mixed sand is put into the casting pattern machine, carry out the molding and core making operation;

3), to carrying out spray treatment through the core behind the molding and core making, coating is mainly water based paint, processing is dried in the back in dryer;

4), molten iron injected in the casting core pours into a mould, and carry out the nature cooling, foundry goods after knockout is handled, carries out Shot Blasting, removing surface and cutting soldering work again.

Claims (1)

1, a kind of casting technique with the resin sand manufacturing mold core is characterized in that, carries out according to the following steps order:

1), molten iron is melting, the raw material that measures is dropped in the line frequency furnace, heating makes it to be fused into molten iron;

2), molding sand is sent in the drying oven dried, put into puddle mixer after the oven dry, and phenol resin, curing agent joined in the mulling processor simultaneously mix, curing agent is made up of phenolic group PIC and triethylamine, the weight of phenol resin is 10～20 times of triethylamine, mixed sand is put into the casting pattern machine, carry out the molding and core making operation;

3), to carrying out spray treatment through the core behind the molding and core making, coating is mainly water based paint, processing is dried in the back in dryer;

4), molten iron injected in the casting core pours into a mould, and carry out the nature cooling, foundry goods after knockout is handled, carries out Shot Blasting, removing surface and cutting soldering work again.