CN2173671Y - Steel ingot directional solidification apparatus - Google Patents

Abstract

The utility model provides steel ingot directional solidification apparatus. The utility model is particularly suitable for the production of steel ingots whose height-diameter ratio (H/D) is smaller than 1. The utility model is composed of a heat insulating cover arranged on the top part of a die body, a heat insulating layer arranged in the ring inner wall of the die body, a condensation piece arranged on the bottom part of the die body, and a liquid steel channel arranged in the center of the condensation piece. The condensation member can adopt a condensation plate or can adopt a condenser. The crystallization direction of the steel ingot is vertically upward and the steel ingot is directionally solidified because the die top and the inner wall of the die body adopt the heat insulating material and die top and the inner wall of the die body obtain sufficient heat loss from the die bottom. The utility model has the advantages of improving the utilization ratio of the steel ingot by 30%, saving energy by 20 %, saving work hour by 50%, etc.

Description

Steel ingot directional solidification apparatus

The utility model relates to a kind of steel ingot device for directionally solidifying, is applicable to that particularly the steel ingot ratio of height to diameter is less than 1 steel ingot production.

The ingot mould of present industrial application in use, the steel ingot poured into a mould is in the natural coagulation process, owing to die holder, the mould body of ingot mould, emit oral area etc. to make by identical metal material (as cast iron), its coefficient of heat conduction is consistent, promptly the dendritic growth of steel ingot inside is unordered in the process of setting behind pouring molten steel, exist unavoidable segregation and loose, cause the surplus of steel ingot to select size (height H, diameter D) big, ingot mould bigger thus, the waste material and the energy.

At the deficiencies in the prior art, task of the present utility model is to provide a kind of size less, compact conformation, can improve the device for directionally solidifying of steel ingot internal soundness.

Task of the present utility model is achieved in that this device is made up of stay-warm case, mould body, condensing part.Promptly increase heat-insulation layer and play a role in insulation, place the stay-warm case at mould body top to be used to compensate the effect of its rising head, place the condensing part of mould body bottom to play conduction of heat in the inboard of conventional steel ingot mould.Condensing part central authorities center of circle position tool molten steel passage also links to each other with the feed trumpet passage.Because mould top and mould body employing heat preservation material also obtain sufficient heat leakage at the bottom of mould, the crystallization direction that makes steel ingot vertically upward.Be that the steel ingot bottom temp is low, top (stay-warm case end) temperature height, make of A type segregation and the gross segregation of inner dendrite, improve the uniformity of steel ingot body along axially upwards growth of steel ingot, elimination or minimizing steel ingot inside.Because the growth of steel ingot dendrite has upwards played a passing and repulsive interaction to harmful components and impurity, they will be with the carrying out that solidifies by reposefully, push the steel ingot end face equably to, can be removed by the operation processing of back step, so the steel ingot internal soundness is improved.Condensing part can be cold plate (steel plate), plate and ingot weight ratio with between 1-2 for well.Condensing part can also adopt condenser, and condenser is by shell, and dividing plate is formed, and the condenser center has the molten steel passage, to pass through molten steel.Inside has the closed ring chamber, and the top of its annular chamber inside and bottom surface (upper and lower) evenly is equipped with dividing plate respectively at interval.Opened cooling fluid input hole and delivery outlet on the shell periphery respectively, the angle between two holes is the 90-180 degree.In the ingot steel casting process of setting, the flow size of control cooling fluid can realize the directional solidification of the inner dendrite of steel ingot.Consider that from back step operation steel ingot ratio of height to diameter (H/D) is fixed on less than in 1 the scope, and promptly forging ratio greatly reduces the size of ingot mould less than 3 in addition.

This installs machine simulated experiment as calculated, and steel ingot is dissected contrast test and effect (at open hearth, big electric rangette, ladle refining furnace) test, and the result shows that the selection of various physicochemical properties and equipment is irrelevant, can use on any smelting equipment.Because the natural refining effect of directional solidification, steel ingot inner clamps foreign material and gross segregation are pushed to above the steel ingot, and can be removed by the operation processing of back step, because the single direction of directional solidification and enough thermograde (△ T＞500 ℃) in addition, the convection current of molten steel is warmed up to be weakened, so the A type segregation relevant with convection current obtains restriction, also make field trash that remains in the body fined (its forging grain size is in the 6-7 level) and homogenising, the institute so that its forging and various performance be improved.Test structure also shows: under the prerequisite that improves the quality, improve steel ingot utilization rate 30%(and promptly reduce by 30% molten steel consumption), energy savings 20% is saved man-hour 50%.

Below in conjunction with accompanying drawing the utility model is described in detail.

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

Fig. 2 is the condenser structure schematic diagram among Fig. 1.

1 cold plate, 2 mould bodies, 3 heat-insulation layers, 4 stay-warm cases, 5 molten steel passages, 6 condensers, 7 shells, 8 dividing plates, 9 cooling fluid input holes, 10 cooling fluid delivery outlets, 11 heat preserving agents

With reference to Fig. 1, the utility model is by stay-warm case 4, and mould body 2 and cold plate 1 are formed.Stay-warm case 4 places mould body 2 tops, and mould body 2 places on the cold plate 1.There is refractory material to make the thermal insulating warm-keeping layer 3 of (as refractory brick, ceramic fibre) at mould body 2 inwalls block.Opened molten steel passage 5 at position, the cold plate 1 central center of circle and be connected, to carry out the directional freeze steel ingot cast by the converter molten steel with the feed trumpet passage.Along with the carrying out that solidifies, the increase of solidification layer, the temperature of cold plate 1 self also will raise, and this will reduce thermograde, be unfavorable for the development of columnar structure.Consider directional solidification effect and help forging operation, so the steel ingot ratio of height to diameter is fixed on less than in 1 the scope.Consider that also cold plate 1 has enough conducting powers, in process of setting, can guarantee thermograde △ T＞500 ℃ of steel ingot and reduce investment, so the cold plate 1 in optimal design and the weight ratio of steel ingot are decided to be between the 1-2.Because the insulation measure on the conductive force of cold plate 1 and mould body, mould top makes the steel ingot bottom temp low, top (stay-warm case 4 ends of being made by steel plate) temperature height makes inner dendrite along the upwards growth of steel ingot axial plane.Be filled with heat preserving agent 11 in the stay-warm case 4, heat preserving agent (for carbonization rice husk or exothermic mixture) floats on the molten steel face, along with the difference of steel grade and the size of steel ingot, can select the cold plate 1 of different size and weight.

Cold plate 1 with reference to Fig. 1, Fig. 2,2 underlyings of mould body can adopt condenser 6 to substitute.Condenser 6 is made up of circular housing 7 and welding dividing plate 8 thereon.Opened steel road passage 5 equally at circular housing 7 centers, and be connected with feed trumpet.Evenly be welded with dividing plate 8 respectively at interval to quicken heat radiation at the top with inside, ring seal chamber and bottom surface (upper and lower), enclosing the angle of having opened respectively on the face between cooling fluid input hole 9 and delivery outlet 10, two holes at shell 7 circumference is 90 °-180 °.In cast ingot solidification process, the flow size of control cooling fluid can realize the directional solidification of the inner dendrite of steel ingot simultaneously the size of ingot mould being greatly reduced, and its result of use is better than cold plate 1.

Claims (3)

1, a kind of steel ingot device for directionally solidifying of mainly forming by die holder, mould body, it is characterized in that: form by stay-warm case, mould body, condensing part, stay-warm case places on one's body the mould, the mould body that inwall has heat-insulation layer places on the condensing part, and the condensing part centre has the molten steel passage and is connected with the feed trumpet passage.

2, steel ingot device for directionally solidifying according to claim 1 is characterized in that: condensing part employing center has the cold plate of molten steel passage.

3, according to claim 1,2 described steel ingot device for directionally solidifying, it is characterized in that: condensing part adopts condenser, condenser is rounded, its center has the molten steel passage, inside has the closed ring chamber, the top of annular chamber and bottom surface evenly are welded with dividing plate at interval, also have cooling fluid input hole and delivery outlet on annular chamber shell periphery.