CN200963671Y

CN200963671Y - Thermal shock resistant foam ceramic filter for casting

Info

Publication number: CN200963671Y
Application number: CNU2006200106454U
Authority: CN
Inventors: 祝建勋; 李金锋
Original assignee: Jinan Shengquan Group Share Holding Co Ltd
Current assignee: Jinan Shengquan Beijin Ceramic Filter Co., Ltd.
Priority date: 2006-10-12
Filing date: 2006-10-12
Publication date: 2007-10-24
Anticipated expiration: 2016-10-12

Abstract

The utility model relates to a heat-impact wearing ceramic foam filter in casting. The filter comprises a filter meshwork with continuous through holes, a pyrolysis buffer layer is stuck on the upper surface of the filter meshwork. The filter of the utility model can effectively enhance the high-temperature durability and heat impact durability, particularly when the utility model is arranged at the part which is impacted directly by metal liquid between the gate cup and the straight pouring way, the utility model has more obvious advantage compared with the traditional filter and can effectively solve the problem that the filter is poured through and is broken; and the utility model is of simple manufacture, low cost, good universality and can be widely used for filtering corundum material of cast aluminium, carborundum material of cast iron, and zirconium of cast steel.

Description

Casting resistance to sudden heating ceramic foam filter

(1) technical field under

The utility model relates to a kind of filter of casting the filtering metal liquation of usefulness, particularly a kind of casting resistance to sudden heating ceramic foam filter.

(2) background technology

Compare with straight-bore ceramic filter with the traditional fibre screen pack, ceramic foam filter has the mesh skeleton structure of the continuous through hole of 3 D stereo, therefore molten metal is had better filter effect (the filter table area is big) and passes through effect (voidage is mostly about 85%), effectively the slag inclusion and the impurity of all size in the filtering metal bath obviously improve the inherent quality of foundry goods and reduce various dreg defects.Ceramic foam filter has obtained applying rapidly in the most of Foundry Production of the China and the world at present.

But because the mesh skeleton of ceramic foam filter is relatively very thin, in the process of filtering the high-temperature metal liquation, also be faced with following problem: at first, when the complex large-sized foundry goods of cast, general pouring head is bigger, pouring temperature also higher (refractory metal casting pouring temperature such as magnesium iron spare, steel-casting, steel alloy are generally all about 1500 ℃), when ceramic foam filter being placed in cup or the sprue, it will bear the direct impact of high-temperature liquid metal and constantly wash away, destructive power to filter is very big, very easily causes the fragmentation of filter; Secondly, floamed ceramics filtrating piece is with after the high-temperature metal liquation contacts, and moment is heated, and the very fast temperature that is elevated to molten metal from the normal temperature state rapidly, the various variations and the stress of refractory aggregate material production cause softening, be out of shape, ftracture even fragmentation of material; Its three, at the cast initial stage, the direct impact filtration net of molten metal, and do not have enough molten metals can make various inclusion floating in the cup causes that easily a large amount of field trashes stop up the screen pack phenomenons, have a strong impact on the percent of pass of filter.

Therefore, be based on the actual behaviour in service when front filter, for domestic casting producer provides a kind of suitable high-temperature heat-resistance impact filter product, minimizing use middle filtrator waters to be worn and broken problem, is a job highly significant.

(3) summary of the invention

The utility model is in order to overcome the deficiency of above technology, a kind of casting resistance to sudden heating ceramic foam filter is provided, can effectively slow down the impact of high-temperature liquid metal to filter, slow down because the destruction that the filter instantaneous temperature sharply raises and brings to filter is avoided the field trash blocking filter.

The utility model is realized by following measure:

Casting of the present utility model resistance to sudden heating ceramic foam filter comprises the screen pack that has continuous through hole, is bonded with the cushion of pyrolytic at the upper surface of screen pack.

Filter of the present utility model, its material of described cushion is generally selected the organic material of pyrolytic, preferably polystyrene foam plastics.

The thickness of polystyrene foam can be decided according to the specification of filter and the material and the pouring condition of the foundry goods that filters.Thickness can be in the 3-10mm scope.In general pouring temperature is high more, and pouring head is big more, and it is big more to water fluence, and required depth of foam is also big more.

Filter of the present utility model, have the following advantages: (1) filter of the present utility model is bearing the bonding one deck foamed plastics of the one side cushion that molten metal impacts, under same pouring condition, because the surge that foamed plastics bears molten metal at the cast initial stage has been avoided direct impulsive force and the destruction of high-temperature liquid metal to filter like this.Especially to being positioned over cup and sprue etc. when being subjected to the direct impulsive force of molten metal than large part, compare with the filter of not placing the foamed plastics cushion and have more obvious advantage, can effectively solve filter and water and wear and broken phenomenon.(2) because the heat-blocking action in short-term of foamed plastics cushion, slowed down that the filter instantaneous temperature sharply raises and destructive power that the various thermal stress variations that produce etc. bring to filter.(3) the cast initial stage because the choked flow effect of foamed plastics cushion can be kept certain height the cup inner metal liquid, helps the come-up of interior impurity of molten metal and slag inclusion, causes the plug-hole phenomenon when preventing a large amount of field trashes by filter.(4) filter of the present utility model, preparation is simple, cost improves little, highly versatile, can be widely used in filtering the cast aluminium molten metal the corundum material, be applied to filter the silicon carbide material of molten iron and be applied to filter the zirconium base filter of molten steel.

(4) description of drawings

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

Fig. 2 is for using the cast schematic diagram of conventional filter

Fig. 3 is for using the cast schematic diagram of the utility model filter

Among the figure, 1 cushion, 2 screen packs, 3 cups, 4 casting of molten metal.

(5) specific embodiment

Below in conjunction with the drawings and specific embodiments the utility model is made specific description.

Structure of the present utility model is made up of cushion 1 and screen pack 2 as shown in Figure 1, and cushion 1 is to be made by polystyrene foam plastics, and thickness is 10mm.Screen pack 2 is to be made by silicon carbide material, is of a size of 100 * 100 * 22mm, 10ppi.

Certain bent axle factory uses conventional filter when producing the spherulitic iron crankshaft foundry goods of certain model, filter often occurs and water and wear and broken phenomenon.Pouring condition is: pouring temperature is 1540 ℃, and pouring head is 500mm, and watering fluence is 850kg, and be 55 seconds the duration of pouring, and filter is placed in the cup.Filter size is 100 * 100 * 22mm, 10ppi, the filter of the silicon carbide material of producing for domestic certain factory.

Respectively pour into a mould 100 in the test and oppose than test, use same batch filter respectively, a kind of is conventional filter (not placing cushion), and another kind is a filter of the present utility model.Cast schematic diagram such as Fig. 2, shown in Figure 3.

Result of the test is: under first kind of situation, there are 6 broken phenomenon to occur altogether, wherein there are 4 all to be when just beginning to pour into a mould, the moment that molten metal washes away filter occurs broken, two occur in casting process in addition, and the filter fragment pours casting mold, produces foundry goods slag inclusion waste product.And under second kind of situation, have 2 broken phenomenons to occur altogether, and all after casting pouring finishes, just occur, the foundry goods inspection is found, do not produce dreg defect, do not influence casting quality.

Result of the test shows, filter of the present utility model, and thermal shock resistance obviously improves, and the filter that can effectively avoid occurring in the casting process waters to be worn and broken phenomenon.In addition, repeatedly actual production shows, the utility model is applicable to the filter (Birmasil corundum material, cast iron silicon carbide material and cast steel zirconia material) of various different sizes, material.Especially those cause easily filter water wear, effect such as (pouring temperature height, speed is big, pressure is big) is more obvious under the broken abominable pouring condition.

Claims

1. a casting resistance to sudden heating ceramic foam filter comprises the screen pack (2) that has continuous through hole, it is characterized in that: the upper surface of screen pack (2) is bonded with the cushion (1) of pyrolytic.

2. filter according to claim 1 is characterized in that: described cushion (1) is a polystyrene foam plastics.

3. filter according to claim 1 and 2 is characterized in that: the thickness of described cushion (1) is 3-10mm.