CN2491152Y

CN2491152Y - Fine sand core for casting type radiator

Info

Publication number: CN2491152Y
Application number: CN 01227963
Authority: CN
Inventors: 李世斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-06-23
Filing date: 2001-06-23
Publication date: 2002-05-15
Anticipated expiration: 2011-06-23

Abstract

The utility model relates to a fine sand core for casting type radiator, which achieves better air permeability than the prior used coarse sand through adopting fine sand, reducing the wall thickness of sand core and enlarging of through holes, and simultaneously makes the inner cavity surface of a cast radiator level, smooth and have no adhering sand by arranging a coating on the surface, so as to achieve the normal operation of the precision instruments in a heating system, save materials and reduce manufacturing cost at the same time.

Description

Water cast radiator fine sand core

The utility model relates to a kind of sand core, refers in particular to water cast radiator fine sand core.

From producing casting shape radiator so far, sand core has gas permeability preferably when casting in order to remain on, generally adopt the core of 30 to 80 purpose grains of sand bonding, utilize space bigger between sand grains, and the triangle air flue that is provided with in sand core center the first half, guarantee that the gas that the burning binding agent produces when watering molten iron passes through, gas is discharged lumen of radiator by this air flue makes radiator not produce pore.But because sand grains is bigger, the sand core wall thickness is bigger, the through hole air flue is narrow, sand core rough surface simultaneously makes the lumen of radiator rough surface of its casting, and this has brought following disadvantage to radiator, one influences heat transference efficiency, two waste cast iron raw materials, three cores are easy-clear not, influences heating system and normally moves.

It is less that the purpose of this utility model provides a kind of wall thickness, and the through hole air flue is bigger, and the ganoid cast radiator sand core that waters of good permeability makes the lumen of radiator smooth surface of its casting, and the noresidue sand grains guarantees that heating system is without prejudice.Improve the heat dispersion of radiator, save material, reduce manufacturing cost

The purpose of this utility model is achieved in that waters cast radiator fine sand core, it is to be made of with coupled several parallel and core right cylinder separately left and right core head, in each core right cylinder, be provided with through hole, through hole is connected with lateral aperture in separately the core head respectively, be equipped with vertical hole perpendicular with its lateral aperture and that be communicated with at left and right core head, the sand core wall thickness is less than 6 millimeters.

Described sand core grit size is less than 90 orders.

Described fine sand core outer surface is coated with one deck by graphite, brown iron oxide, the synthetic dope layer of bubble core alkali.

Because adopt such scheme to make the attenuation of sand core wall thickness, the through hole air flue strengthens, the lumen of radiator smooth surface noresidue sand grains of casting, can keep the precision instrument in the heating system normally to move, improve heat dispersion 3.2% simultaneously, save cast iron 4%, save coremaking material 35%.

Below in conjunction with accompanying drawing and enforcement the utility model is further specified:

Accompanying drawing 1 is the utility model structural representation.

Accompanying drawing 2 is that the A-A of Fig. 1 is to cross section view.

By the embodiment shown in Fig. 1,2 as can be known, fine sand core 3 is in the middle of last fine sand type 1 and following fine sand type 2, it is to be made of with coupled several parallel and core right cylinder 32 separately left and right core head 31, in each core right cylinder 32, be provided with through hole 321, through hole 321 is connected with lateral aperture in separately the core head 31 respectively, left and right core head 31 is equipped with vertical hole 311 perpendicular with its lateral aperture and that be communicated with, vertically hole 311 is upward through fine sand type 1, the gas that produces during for the casting molten iron passes through, and the sand core wall thickness is less than 6 millimeters.Sand core is to form by boning less than 90 purpose fine sands, and its surface is more smooth, is difficult for residual sand grains; Be coated with one deck by graphite, brown iron oxide, the synthetic dope layer 4 of natron at this fine sand core outer surface again, make its surface more smooth.

By reducing the thickness of sand core wall, reduce air permeance resistance, again by strengthening the air flue of sand core through hole 321, to reduce pressure at expulsion, smooth and easy the passing through of gas that is produced when making the casting molten iron discharged inner chamber, makes the radiator of casting not produce pore.Coating 4 makes the sand core smooth surface, and coating is heated in casting cycle, breaks away from wall, makes the sand grains can not be bonding with wall, and reaching lumen of radiator does not have scab.

Logical fine grained sand and the surface coating of using of the utility model makes inner surface smooth, smooth, eliminated surperficial projection, reduced weight, eliminated surperficial projection simultaneously to the invalid wall thickness that radiator produced, and improved heat transfer property.Reduce sand core weight by adding the large through-hole air flue, saved the coremaking material, reduced manufacturing cost.

Claims

1, a kind of cast radiator fine sand core that waters, it is characterized in that: it is to be made of with coupled several parallel and core right cylinder (32) separately left and right core head (31), in each core right cylinder (32), be provided with through hole (321), through hole (321) is connected with lateral aperture in separately the core head (31) respectively, be equipped with vertical hole (311) perpendicular with its lateral aperture and that be communicated with at left and right core head (31), the sand core wall thickness is less than 6 millimeters.

2, the sand core of casting column radiator according to claim 1 is characterized in that: described sand core grit size is less than 90 orders.

3, according to the sand core of claim 1 or 2 described casting column radiators, it is characterized in that: described sand core outer surface is coated with one deck by graphite, brown iron oxide, the synthetic dope layer (4) of bubble core alkali.