CN201179552Y - Sand mold mould for cast iron product - Google Patents

Abstract

The utility model discloses a sand mold used for an iron casting. Cooling rods are arranged at the outer side of a mold body which correspondingly forms a casting thermal center, the diameter of one of the cooling rods is ranged from 1/4 to 1/2 of mold amount at the casting thermal center, the height of the cooling rod is 8 times to 10 times of the diameter, an arrangement distance between two adjacent cooling rods is between 20 mm and 30 mm, the cooling rods are uniformly arranged, and the cooling rods are connected with or inserted into the mold body in a threaded way. The sand mold used for the iron casting has the characteristics that the defects of shrinking looseness and shrinkage cavity generated at the thermal center after the casting is solidified are avoided, high efficiency, simplicity and low cost are included, the technological yield is enhanced, the cooling rods are automatically dropped off in drop sand cleaning after the casting is cooled, and no casting cleaning cost is increased.

Description

A kind of ironcasting sand mold mould

Technical field

The utility model belongs to the casting mould technical field, especially relates to a kind of ironcasting sand mold mould.

Background technology

Many ironcastings are as automobile brake disc, automobile brake drum, clutch disk, ring flange, bearing cap etc., owing on the design of part, exist the long and narrow thermal center of ring seal in the junction of different wall.Thermal center is meant in process of setting, metal freezing node or zone slowly around the foundry goods internal ratio.The long and narrow thermal center of dish class ironcasting ring seal is not very big though solidify modulus, and dispersed strong, traditional feeding technology is difficult to form effective feeding to this dispersed thermal center, easily forms dispersed shrinkage porosite, shrinkage cavity defect at the thermal center place behind the casting solidification.

Producing this class ironcasting solution shrinkage defect process commonly used at present has riser feeding method and thermal center place to add two kinds of technologies of chill.

The advantage of riser feeding technology is effective to the feeding of concentrating thermal center, owing to be subjected to the restriction of feeding distance and feeding passage modulus, this technology is disperseed the feeding weak effect of thermal center to dish class ironcasting.This feeding technology has comparatively strict requirement to molten iron chemical composition and pouring temperature simultaneously, so the scope of application of this technology is narrow partially, technology stability is poor, dish class ironcasting adopts the ratio of this feeding technology generation shrinkage porosite, shrinkage cavity defect very high, can not thoroughly solve shrinkage porosite, shrinkage cavity problem.

The place adds chill at iron-castings, because there are the very large temperature difference in chill and high temperature liquid iron, chill will absorb heat from the foundry goods thermal center, accelerate the cooling velocity at thermal center place in the foundry goods cooling procedure, reduce the modulus that solidifies of thermal center, can solve shrinkage porosite, the shrinkage cavity defect at thermal center place very effectively.But the production efficiency of this technology is very low, because the manufacturing process of chill is strict complicated, recovery process is loaded down with trivial details, and each casting mold all will add chill, and the foundry goods of different size needs the chill of different size, the foundry goods of production in enormous quantities, and the chill demand is big.Chill can reclaim use, but re-using number of times and should strictly controlling of the chill that reclaims can not use repeatedly because use repeatedly repeatedly chill not only chilling action descend, the effect of chill was lost efficacy, and easily makes foundry goods produce gas hole defect.Adding chill in casting mold need be by manually finishing, can not form automated production, on high-speed automated production line, use this technology certainly will cause people's such as automation equipment standby phenomenon, reduce the production efficiency of automatic assembly line, increase the operating cost of equipment.Obviously, chill technology only is applicable to the manual production of small lot, is not suitable for the production in enormous quantities of the full-automatic mo(u)lding line of high-speed and high-efficiency.

Do not have a kind of sand mold mould can solve owing to casting structure at present, casting solidification finishes the back easily produces shrinkage porosite, shrinkage cavity defect at the thermal center place problem.

Summary of the invention

The purpose of this utility model is to improve the deficiency of prior art and provides a kind of and avoid that casting solidification finishes that the back produces shrinkage porosite, shrinkage cavity defect at the thermal center place, has efficient, simple and easy, low-cost, product yield raising, comes off automatically, do not increase in the peeling of cooling stick after foundry goods has cooled off the ironcasting sand mold mould of any casting cleaning expense.

The purpose of this utility model is achieved in that a kind of ironcasting sand mold mould, is made up of mold, is characterized in that the mold outside that forms the foundry goods thermal center in correspondence is provided with cooling stick.

In order further to realize the purpose of this utility model, the diameter that can be cooling stick is the 1/4-1/2 of foundry goods thermal center place modulus, highly is 8-10 times of diameter.

In order further to realize the purpose of this utility model, can be that the arrangement pitches between adjacent two cooling sticks distributes between 20-30mm and evenly.

In order further to realize the purpose of this utility model, can be that cooling stick is threaded or pegs graft with mold.

Compared with the prior art the utility model has following distinguishing feature and good effect: the utility model adopts in the mold outside of correspondence formation foundry goods thermal center and is provided with cooling stick, cooling stick is as the part of casting die, the corresponding foundry goods die cavity that forms during moulding, after finishing, pouring molten iron forms and some cold muscle that quantity with shape with cooling stick the same that link to each other with foundry goods thermal center place, single cold muscle is from seeing an iron staff that is connected with the foundry goods thermal center exactly in shape, the effect of cold muscle is exactly that it can be when foundry goods also be in high-temperature liquid state more than 1150 ℃, itself has been in solid-state below 600 ℃, because there is the big temperature difference in the two, cold muscle will absorb heat from the foundry goods thermal center, effect is equivalent to chill, can quicken the cooling velocity of thermal center, reduce thermal center, the shaping die cavity of cold muscle is made together with the casting forming die cavity in modeling process, when cast, be shaped simultaneously with foundry goods, do not need additionally to increase curring time, with respect to using chill to have efficiently, simple and easy, advantage cheaply, so this technology can be given full play to the high-effect of automatic molding line, automatically come off in the peeling of cold muscle after foundry goods has cooled off, do not increase any casting cleaning expense.

Description of drawings

Fig. 1 is a kind of structural representation of the present utility model.

Fig. 2 is the cutaway view of Fig. 1.

Specific embodiments

Embodiment 1, a kind of ironcasting sand mold mould, be to be provided with cooling stick 2 in mold 2 outsides of correspondence formation foundry goods thermal center, the diameter of cooling stick 2 is the 1/4-1/2 of foundry goods thermal center place modulus, highly be diameter 8-10 doubly, arrangement pitches between adjacent two cooling sticks 2 distributes between 20-30mm and evenly, cooling stick 2 is threaded or pegs graft with mold 1, present embodiment is an example with the dish type casting die, with reference to Fig. 1, Fig. 2, according to coiling the characteristics that class foundry goods thermal center distributes ringwise, the distribution of cooling stick 2 is the outside of center of circle circular array at mold 1 in foundry goods thermal center position or near the center with dish class foundry goods on the thermal center position also, generally between 20-30mm, the quantity of cooling stick 2 can get according to the girth of annular thermal center and the distance computation of cooling stick arrangement pitches between per two cooling sticks 2.

Claims (4)

1, a kind of ironcasting sand mold mould is made up of mold (1), it is characterized in that mold (1) outside that forms the foundry goods thermal center in correspondence is provided with cooling stick (2).

2, a kind of ironcasting sand mold mould according to claim 1, the diameter that it is characterized in that cooling stick (2) is the 1/4-1/2 of foundry goods thermal center place modulus, highly is 8-10 times of diameter.

3, a kind of ironcasting sand mold mould according to claim 1 and 2 is characterized in that the arrangement pitches between adjacent two cooling sticks (2) distributes between 20-30mm and evenly.

4, a kind of ironcasting sand mold mould according to claim 1 is characterized in that cooling stick (2) is threaded or pegs graft with mold (1).

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