CN1519069A - Method for manufacturing cast-iron radiator without sand inside cavity - Google Patents

Abstract

A technology for manufacturing the heat radiator with cast iron, which has no sand in its internal cavity, includes preparing sand core, modelling, loading sand core in mould, and casting. Said steps for preparing sand core includes preparing resin sand from sand, resin, dibutyl ester, calcium stearate, urotropine and silane as coupling agent through mixing, preparing sand core by moulding, solidifying, demoulding and trimming.

Description

A kind ofly produce the method that inner chamber does not have the sand cast-iron radiator

Technical field

The present invention relates to a kind of method of producing cast-iron radiator, particularly relate to a kind of method that inner chamber does not have the sand cast-iron radiator of producing, be to the improvement of existing cast-iron radiator production technology, belong to casting technology field, be suitable for the existing producer that produces cast-iron radiator and adopt.

Background technology

At present, the producer of domestic production cast-iron radiator is a lot, all be to adopt traditional casting technique, still to lean on original method to finish when especially making casting sand core, be about to common with sand adding quarrel oil binder, through artificial back-up sand, the reality of pounding, take off procedures such as box and oven dry and make the core of casting usefulness, the sand core strength of its making is little, ratio of briquetting is low, low precision, can cause the inclined to one side skin of radiator, can produce a large amount of oil smoke when baking, cause environmental pollution, technological means during sand removal is more backward, basically be to adopt manually to lash with steel bar, so that the molding sand of radiator inwall comes off, work under bad environment, condition is arduous, big and the quality of labour intensity can't guarantee, and the cleaning of the sand of radiator inwall is unclean, can make heat transfer medium be subjected to resistance, influence heating quality, after particularly urban heating is carried out branch family system now, need on former heating pipe, to install heat control valve and heat meter, if sand cleaning is unclean, residual sand can enter with heat transfer medium and make it can't operate as normal in heat control valve and the heat meter.For this reason, people have carried out the research improvement to the cast-iron radiator production technology.For example the Chinese invention patent application discloses a kind of " Coremaking technology for cast-iron radiator " for No. 97100293.2, this process using core making machine, the coremaking of sulfur dioxide cold-box process, promptly do raw sand with 50～100 purpose fillet sand, add synthetic resin, peroxide and coupling agent, synthetic resin is 1.2～1.5% of sand amount, the addition branch of peroxide and coupling agent picks and is 25～40% and 0.2～0.4% of amount of resin, mix as the raw material core sand, on core shooter with mixed uniformly core sand, under the air pressure about 4 kilograms, inject simultaneously in the core of dimidiation by penetrating the sand plate, penetrate sand plate surface and be provided with air flue in the core, after automatic die assembly is one, feed SO under the normal temperature immediately ₂Gas, the rapid curing molding of core continues to be blown into clean hot-air to remove excessive SO ₂This technical scheme is one progressive for traditional making casting sand core technology, but the sand that can't solve radiator inwall is cleared up sordid problem.China's utility model patent then provides a kind of " cast iron central heating radiator in sand cleaning machine " for No. 91229141.9, this sand cleaning machine by frame, transmit, knock, several parts of track form.Radiator is placed in orbit, is sent to by the chain that pin is housed and knocks station, carries out intermittence machinery by 4 groups of tripod pole pairs of 4 groups of cam drivens workpiece and knocks, and the molding sand of radiator inwall is come off, and reaches the purpose of interior sand removal.This sand cleaning machine complex structure, cost of manufacture height, the life-span to cast-iron radiator during sand removal is influential, and the sand of radiator inwall can't be cleaned out.

Summary of the invention

The objective of the invention is to overcome the above-mentioned deficiency of prior art, by existing cast-iron radiator production technology is improved, provided a kind of method that inner chamber does not have the sand cast-iron radiator of producing, this process using resin sand is raw sand, the coremaking of shell core machine machinery, the hot box curing mode of electrical heating heating is produced the core of radiator, the ratio of briquetting of its coremaking is up to 98%, the ratio of briquetting of radiator is up to more than 90%, because the dimensional accuracy height has guaranteed that the wall thickness of radiator is even, and the voltage endurance capability of raising radiator, made it to reach the requirement that this type of radiator is installed in the skyscraper, and the bright and clean no sand of the inner chamber of the radiator of producing, that has saved existing technology beats the sand removal operation, can not make heat transfer medium be subjected to resistance, improved heating quality, adapted to present urban heating fully and carry out after the branch family system new standard the cast-iron radiator quality.

The technical solution that the present invention provides is: this production inner chamber does not have the method for sand cast-iron radiator, includes operations such as making core, moulding, following core, casting, is characterized in making including the following step in the core operation:

(1). preparation resin sand

0.2～0.4 part of 0.10～0.15 part of 0.02～0.05 part of 1.5～2.5 parts of 100 parts of sands, resins, dibutylester, calcium stearate, urotropine, the silicon institute coupling agent that will meet the casting requirement mix as the raw material core sand for 0.01～0.03 part.The fusing point of raw material core sand is that 100～102 ℃, granularity are 70～140 orders.

(2). the coremaking of shell core machine machinery

With pack into the husky storehouse of storage on the shell core machine of the raw material core sand that mixes, the metal core that will have electric heating tube is heated to 170 ℃, the exhaust needle of opening prefabricated core inside exhaust pipe road on the metal core of being made up of fixed half and moving half connects, behind the matched moulds under the pressure of air, by sand-shooting head the raw material core sand that mixes is injected in the core of dimidiation simultaneously, extracting exhaust needle even solidified 2 minutes down for 140～185 ℃ in temperature the back, die sinking allows core automatic demoulding and simple core finishing then, and it is standby that the husky core that will make at last changes next procedure over to.

In the present invention, operations such as moulding, following core, casting are all same as the prior art, and the shell core machine equipment in making the core operation also is commercially available.

Compared with prior art, this production inner chamber that provides of the present invention beneficial effect that do not have the method for sand cast-iron radiator is:

1. because in casting cycle subsequently, core can be flowed out during sand removal smoothly by pyrolytic, no longer impacts with hammer or steel ball, can reach the bright and clean no sand of inner chamber of radiator, fineness can reach 6.3 class precisions of GBT15056-94 standard;

2. because the bright and clean no sand of inner chamber of radiator has reduced the resistance of heat transfer medium, thereby reduced heating cost, improved heating quality, adapted to present urban heating fully and carry out after the branch family system new standard the cast-iron radiator quality;

3. the dimensional accuracy height of core, scale error is positive and negative to be 0.2mm, the high 35Kg/cm of intensity ², the ratio of briquetting of coremaking is up to 98%, and the ratio of briquetting of radiator is up to more than 90%, because the dimensional accuracy height has guaranteed that the wall thickness of radiator is even, and improves the voltage endurance capability of radiator, has made it to reach the requirement that this type of radiator is installed in the skyscraper;

4. adopt mechanical coremaking, electrothermal solidifying technology, production environment is pollution-free and reduced labour intensity, helps workers'health;

5. the husky core of resin is in the process of pyrolytic, at a kind of very thin resin molding of inner chamber generation of radiator. and this resin molding can effectively play antirust anti-scaling action to a certain degree.

The specific embodiment

Below in conjunction with the embodiment that provides concrete technical scheme of the present invention is described further:

This production inner chamber that the present invention provides does not have the method for sand cast-iron radiator, include operations such as making core, moulding, following core, casting, operations such as wherein moulding, following core, casting are all same as the prior art, shell core machine equipment in making the core operation also is to buy from the market, includes the following step in making the core operation:

(1). preparation resin sand

0.3 part of 0.12 part of 0.03 part of 2 parts of 100 parts of sands, resins, dibutylester, calcium stearate, urotropine, the silicon institute coupling agent that will meet the casting requirement mix as the raw material core sand for 0.02 part.The fusing point of raw material core sand is that 100～102 ℃, granularity are 70～140 orders.

(2). the coremaking of shell core machine machinery

With pack into the husky storehouse of storage on the shell core machine of the raw material core sand that mixes, the metal core that will have electric heating tube is heated to 170 ℃, the exhaust needle of opening prefabricated core inside exhaust pipe road on the metal core of being made up of fixed half and moving half connects, behind the matched moulds under the pressure of air, by sand-shooting head the raw material core sand that mixes is injected in the core of dimidiation simultaneously, extracting exhaust needle even solidified 2 minutes down for 140～185 ℃ in temperature the back, die sinking allows core automatic demoulding and simple core finishing then, and it is standby that the husky core that will make at last changes next procedure over to.

Claims (1)

1. produce the method that inner chamber does not have the sand cast-iron radiator for one kind, include operations such as making core, moulding, following core, casting, it is characterized in that making including the following step in the core operation:

(1). preparation resin sand

To meet 0.2～0.4 part of 0.10～0.15 part of 0.02～0.05 part of 1.5～2.5 parts of 100 parts of sands, resins, dibutylester, calcium stearate, urotropine, the silicon institute coupling agent that casting requires and mix as the raw material core sand for 0.01～0.03 part, the fusing point of raw material core sand is that 100～102 ℃, granularity are 70～140 orders;

(2). the coremaking of shell core machine machinery

With pack into the husky storehouse of storage on the shell core machine of the raw material core sand that mixes, the metal core that will have electric heating tube is heated to 170 ℃, the exhaust needle of opening prefabricated core inside exhaust pipe road on the metal core of being made up of fixed half and moving half connects, behind the matched moulds under the pressure of air, by sand-shooting head the raw material core sand that mixes is injected in the core of dimidiation simultaneously, extracting exhaust needle even solidified 2 minutes down for 140～185 ℃ in temperature the back, die sinking allows core automatic demoulding and simple core finishing then, and it is standby that the husky core that will make at last changes next procedure over to.