CN106623825A - Heat-preservation cap and manufacture method thereof - Google Patents

Abstract

The invention discloses a heat-preservation cap. The heat-preservation cap is sintered by aluminium silicate, silica sol, melted quartz sand and a fiber reinforced material, and the heat-preservation cap is provided with a plurality of melt inlets which penetrate through sidewalls of the heat-preservation cap. Compared with a heat-preservation cap made of a common refractory material, the heat-preservation cap made of the above materials is advantaged in that the heat-preservation cap has a lower thermal expansion coefficient, a higher quick cooling and quick heating resistance and a higher self intensity, and therefore a heat-preservation cap in a relatively-large size is not liable to crack during the baking and using process, and the working reliability and the usage effect are improved. Furthermore, by arranging the plurality of melt inlets, the flow field and the temperature field in the heat-preservation cap are relatively uniform, and moulding and microstructure uniformity of ingot castings are facilitated. The invention also relates to a manufacture method of the above heat-preservation cap.

Description

A kind of hot top and its manufacture method

Technical field

The present invention relates to aluminium alloy casting technology field, more particularly to a kind of hot top, and the hot top Manufacture method.

Background technology

Metal (such as aluminium alloy is illustrated as a example by following aluminium alloy) is needed during ingot casting Aluminium alloy melt 01 (as shown in Figure 1) is equably imported in the crystallizer 02 that outer wall is water-cooled, Under the side wall of crystallizer 02 and the collective effect of base 03 quick solidification crystallization, and formed one it is harder Solid solidified shell 04.When the horizontal liquid level of aluminium alloy melt 01 reach a certain height in device to be crystallized 02, The haulage gear of casting machine just drives base 03 and the solidified shell 04 that has been set on base 03 together with one Constant speed degree continuously, is equably moved down (as shown in Figure 1).It is separated from being frozen into for crystallizer 02 The part of ingot casting is immediately exposed to the direct cooling of the secondary cooling water from the lower edge of crystallizer 02, ingot casting Crystallizing layer also continuously to central area propulsion and complete solidification and crystallization therewith.Treat that extrusion ingot length reaches regulation After size, stop casting, unload ingot casting, base 03 returns to home position, that is, complete a casting time.

And in order to further improve ingot casting effect, at present, a kind of Hot-Top mould is occurred in that on market, its Structure is the refractory material system that an annular is increased on the basis of traditional aluminum or copper crystallizer 02 The hot top 05 of work, as shown in figure 1, hot top 04 is arranged on the top side wall of crystallizer 02, the guarantor The melt inlet 06 being incorporated into aluminium alloy melt 01 in crystallizer 02 is provided with warm cap 05, such as Shown in Fig. 2 and Fig. 3, to realize that the same level of aluminium alloy melt 01, aluminium alloy melt 01 are incubated, remove The purposes such as shunting disk.Aluminium alloy melt 01 realizes same level for stream it is ensured that the aluminium alloy of minimum degree melts The rolling slag making of body 01 and air-breathing, it is molten to aluminium alloy so as to ensure that the metallurgical quality of aluminium alloy melt 01 Body 01 carries out insulation and is conducive to improving cold shut, dregs floating, remove shunting disk just almost eliminate light it is brilliant and Most forming core core of thick compound, so as to greatly improve the metallurgical quality of ingot casting.

But, in the prior art, it is merely capable of producing the hot top 05 of the reduced size of reliably working, It is caused to use cooperatively with the crystallizer 02 compared with small dimension.And coordinating with big specification crystallizer makes The hot top of large-size (Ф 1350mm), because of its physical dimension super large, causes manufacture difficulty urgency Increase severely and add, and cracking is very easy to when using, damaged insulation cap material is also easy to be involved in aluminium alloy melt In, expected using effect is not only reached, impact is also caused on product quality.Also, it is existing Cause hot top aluminium alloy melt again without other structures in addition to a melt inlet is set on hot top Flow and heat flux is uneven, affects shaping and the structural homogenity of ingot casting.

Therefore, the how functional reliability and using effect of further hot top, is current art technology Personnel's problem demanding prompt solution.

The content of the invention

In view of this, it is contemplated that proposing that a kind of new, overall dimensions reach the insulation of Ф 1350mm Cap, by changing material and structure so as to which functional reliability and using effect are obviously improved.

In order to achieve the above object, the technical scheme is that what is be achieved in that：

A kind of hot top, the hot top is by alumina silicate, Ludox, tekite sand and fiber reinforcement material Material sintering is formed, and the multiple melt inlets through its side wall are offered on the hot top.

Further, above-mentioned hot top, on the side wall circumferential reinforcement is provided with.

Further, above-mentioned hot top, also includes the melt outlet through the side wall.

Further, above-mentioned hot top, whole melt inlets are uniformly distributed in the circumferential.

Further, above-mentioned hot top, the inner chamber of the hot top is to open with open top and bottom The conical internal cavity of mouth, diameter of the open-topped diameter less than the bottom opening.

Further, above-mentioned hot top, the open-topped diameter span is 1245mm～1255mm, the diameter span of the bottom opening is 1275mm～1285mm.

Further, above-mentioned hot top, the height of the side wall is 205mm～215mm.

Further, above-mentioned hot top, the thickness of the side wall is 70m～80mm.

The invention provides a kind of manufacture method of hot top, the method is suitable for such as above-mentioned any one institute The hot top stated, it is comprised the following steps：

1) the fibrous alumina silicate is blended using mixer；

2) Ludox, the tekite sand and the fiber reinforcement material are added in the alumina silicate Material, and stir；

3) by the alumina silicate of mixing, the Ludox, the tekite sand and the fiber reinforcement Material pours mould mesohigh or vibrating forming into；

4) profiled member is machined out so as to which size and structure meet the requirements；

5) high temperature sintering is carried out to profiled member, obtains hot top finished product.

The hot top that the present invention is provided, it is different from the hot top that existing common refractory makes, adopt Be will to sinter to form after alumina silicate, Ludox, tekite sand and fibre reinforced materials mixed-forming. Wherein, Ludox is bonding agent, based on alumina silicate, and plays insulation effect, and tekite sand rises resistance to The effect of expanding with heat and contract with cold, fibre reinforced materials plays structural re-enforcement, so that being fabricated by by above-mentioned material Hot top compared with the hot top that common refractory is manufactured, with relatively low thermal coefficient of expansion, resistance to urgency Cold anxious heat energy power is stronger, it may have higher self-strength, and the hot top for making large-size is being toasted and made It is not easy to crack with during, improve functional reliability and using effect.In addition, arrange multiple melts entering Mouthful, additionally it is possible to make the Flow and heat flux of hot top more uniform, advantageously in ingot casting shaping and Structural homogenity.Present invention also offers a kind of manufacture method of above-mentioned hot top.

Description of the drawings

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality Apply the accompanying drawing to be used needed for example or description of the prior art to be briefly described, it should be apparent that, below Accompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, not On the premise of paying creative work, can be with according to the other accompanying drawings of accompanying drawing acquisition for providing.

Fig. 1 is the structural representation of Hot-Top mould in prior art；

Fig. 2 is the top view of traditional hot top；

Fig. 3 is the right view of Fig. 2；

Fig. 4 is the structural representation of hot top provided in an embodiment of the present invention；

Fig. 5 is the A-A sectional views of Fig. 4；

Fig. 6 is the flow chart of the manufacture method of hot top.

In Fig. 1-Fig. 5：

Aluminium alloy melt 01, crystallizer 02, base 03, solidified shell 04, hot top 05, melt inlet 06；

Melt inlet 01, melt outlet 02.

Specific embodiment

The present invention proposes the hot top that a kind of new, overall dimensions reach Ф 1350mm, by changing Material and structure so as to which functional reliability and using effect are obviously improved.

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the invention, and It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing Go out the every other embodiment obtained under the premise of creative work, belong to the scope of protection of the invention.

As shown in Figure 4 and Figure 5, a kind of large-size (Ф 1350mm) is embodiments provided Hot top, compared with existing hot top, in terms of material and manufacturing process, does not use common fire resisting Materials processing is molded, but by mixing alumina silicate, Ludox, tekite sand and fibre reinforced materials (such as glass wool cloth), after carrying out forming operation, then is obtained by sintering；In configuration aspects no longer One melt inlet 1 is only set, but multiple melt inlets 1 are set, and be also provided with melt outlet 2.

By above-mentioned improvement, manufacture material change cause the present embodiment provide hot top have it is relatively low Thermal coefficient of expansion, resistance to rapid heat cycle ability is stronger, it may have higher self-strength, makes large-size Hot top is not easy to crack during baking and use, improves functional reliability and using effect, favorably Realization in technical scheme in actual production；Improvement in structure, can make hot top flow field and Temperature field is more uniform, because with the increase of hot top specification, can cause hot top aluminium alloy melt Flow and heat flux uniformity be deteriorated, if now still only one of which melt inlet 1, flow field and temperature The uniformity of degree field is difficult to ensure that, so arrange multiple melt inlets 1, then comparatively Flow and heat flux Uniformity can be more preferable, advantageously the shaping in ingot casting and structural homogenity.

For the hot top that further optimisation technique scheme, the present embodiment are provided, also set up on its side wall There is reinforcement (not shown), this reinforcement can further improve it certainly in the circumference of hot top Body intensity, avoids with reduction or completely the generation of hot top cracking phenomena during baking and use, most The functional reliability for ensureing the hot top that the present embodiment is provided of big degree.

Preferably, the hot top that the present embodiment is provided, also includes a melt outlet 2 through side wall. Wherein, whole melt inlets 1 are uniformly distributed in the circumferential, and melt outlet 2 is molten with one of those Body import 1 aligns setting, as shown in Figure 4.In the present embodiment, arrange melt outlet 2 effect be During generation unit exception (such as casting machine stops), can timely by hot top by melt outlet 2 In aluminium alloy melt release the generation for avoiding more major accident.In normal casting, i.e. aluminium alloy melt When hot top is entered normal through aluminium alloy melt, melt outlet 2 is blocked.And make all of molten Body import 1 is uniformly distributed in the circumferential, and makes melt outlet 2 align setting with melt inlet 1, can The uniformity of the Flow and heat flux of hot top aluminium alloy melt is further improved, and ensures that aluminium alloy melts Body more quick, can be discharged timely.

In the present embodiment, the inner chamber of hot top is the conical internal cavity with open top and bottom opening, top The diameter of portion's opening is less than the diameter of bottom opening, as shown in Figure 5.This kind of set-up mode, can enter one Step ensures aluminium alloy melt same level, the effect of insulation, is preferred embodiment, and conical internal cavity Cavity wall needs smooth, flawless, pore-free.In addition, inner chamber thinks can be diameter phase everywhere Deng cylindrical cavity.Specifically, open-topped diameter span is 1245mm～1255mm, excellent Elect 1250mm as, the diameter span of bottom opening is 1275mm～1285mm, preferably 1280mm.Verified by many experiments, above-mentioned span is the preferred scope of the present embodiment, and it is more Be conducive to the lifting of hot top using effect.And it is preferred that, chamfering or setting are not provided with bottom opening Rounding.

It is further preferred that the height of side wall is 205mm～215mm, preferably 210mm, side wall Thickness is 70m～80mm, preferably 75mm.This span again by many experiments verify, What is drawn best suits the most preferably number range of quality requirements.Also, top surface and the bottom surface of side wall, that is, protect Smooth plane is processed as along face and lower edge face on warm cap, the raising of using effect is equally beneficial for.

As shown in fig. 6, the present embodiment additionally provides a kind of manufacture method of above-mentioned hot top, specifically include Following steps：

S101, fibrous alumina silicate is blended using mixer；

S102, in the alumina silicate for blending Ludox, tekite sand and fibre reinforced materials are added, and Stir；

S103, the alumina silicate being well mixed, Ludox, tekite sand and fibre reinforced materials are poured into Mould mesohigh or vibrating forming；

S104, profiled member is machined out so as to size and structural requirement；

S105, high temperature sintering is carried out to profiled member, obtain hot top finished product.

Using hot top obtained in said method, in first time using front, appropriate polishing inner surface is needed, Appropriate small fire baking preheating again, then one layer of thin coating is coated on an internal surface, then suitably toast, wherein, Appropriate polishing is polished flat to will be incubated cap surface, and suitably increases surface roughness, is easy to coating Absorption, then appropriate small fire baking, also for the absorption for being easy to coating.Every time using rear as found to apply Material situation about coming off occurs, and is first come off region with sand papering, then suitably toasts the region that comes off with small fire, Again in the coating that the region coating last layer is thin, then suitably toast.Every time using rear as discovery hot top has Breakage, first disposes the part that damaged area substantially loosens, then is blown clean with compressed air, then with repairing Material is repaired, and after feed supplement to be repaired is completely dried, with the sand papering repairing area, is applied again by preceding method Cover coating.When hot top is reused after stopping using a period of time, the first heat should fully dry on request Roasting preheating insulation cap, continuously using can be without baking and thermal insulation cap between heat.

Each embodiment is described by the way of progressive in this specification, and each embodiment is stressed The difference with other embodiment, between each embodiment remaining identical similar portion mutually referring to .

The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use The present invention.Various modifications to these embodiments will be for those skilled in the art aobvious and easy See, generic principles defined herein can without departing from the spirit or scope of the present invention, Realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein, And it is to fit to the most wide scope consistent with principles disclosed herein and features of novelty.

Claims (9)

1. a kind of hot top, it is characterised in that the hot top is by alumina silicate, Ludox, vitreous silica Sand and fibre reinforced materials sintering are formed, and are offered on the hot top through the multiple molten of its side wall Body import.

2. hot top according to claim 1, it is characterised in that be provided with circumference on the side wall Reinforcement.

3. hot top according to claim 1, it is characterised in that also include through the side wall Melt outlet.

4. hot top according to claim 3, it is characterised in that all the melt inlets are in week It is uniformly distributed upwards.

5. hot top according to claim 1, it is characterised in that the inner chamber of the hot top is tool There is the conical internal cavity of open top and bottom opening, the open-topped diameter is less than the bottom opening Diameter.

6. hot top according to claim 5, it is characterised in that the open-topped diameter takes Value scope is 1245mm～1255mm, and the diameter span of the bottom opening is 1275mm～1285mm.

7. hot top according to claim 1, it is characterised in that the height of the side wall is 205mm～215mm.

8. the hot top according to claim 1-7, it is characterised in that the thickness of the side wall is 70m～80mm.

9. a kind of manufacture method of hot top, it is characterised in that the method is applied to such as claim 1-8 Hot top described in middle any one, it is comprised the following steps：

1) the fibrous alumina silicate is blended using mixer；

2) Ludox, the tekite sand and the fiber reinforcement material are added in the alumina silicate Material, and stir；

3) by the alumina silicate of mixing, the Ludox, the tekite sand and the fiber reinforcement Material pours mould mesohigh or vibrating forming into；

4) profiled member is machined out so as to which size and structure meet the requirements；

5) high temperature sintering is carried out to profiled member, obtains hot top finished product.