A coated sand casting hot core box device with aerogel mat

Abstract

The utility model relates to a coated sand foundry hot core box device with aerogel felt, include: hot core box body, nanometer aerogel felt layer, press and cover type fixed plate and wear joint type fixed assembly, hot core box body includes fixed mould and movable mould, and the inside is formed sand core cavity after the butt joint combination of fixed mould and movable mould, the face of fixed mould and movable mould mutual contact after the mould closing is the parting surface, nanometer aerogel felt layer includes the first nanometer aerogel felt layer of setting in the outside of fixed mould and movable mould and the second nanometer aerogel felt layer of setting in the parting surface, press and cover type fixed plate covers in the outside of first nanometer aerogel felt layer, and wear joint type fixed assembly is passed through press and cover type fixed plate, first nanometer aerogel felt layer and its head end is screwed to the surface of fixed mould or movable mould, and the second nanometer aerogel felt layer adopts high temperature resistant glue and is pasted and fixed in the parting surface of fixed mould and movable mould. This scheme has solved the technical problems, such as the serious heat loss of hot core box, high energy consumption, low heat insulation efficiency of prior art.

Description

Technical Field

[0001] This utility model relates to the technical field of coated sand casting core-making equipment, specifically to a coated sand casting hot core-making box device with aerogel felt. Background Technology

[0002] The hot core box is a key tooling equipment used in casting production to manufacture sand cores. Its core principle is to quickly form high-precision sand cores by heating and curing coated sand. The core box is made of thermally conductive alloy (such as H13 steel) and has heating pipes embedded inside to ensure temperature uniformity. In coated sand casting production, the hot core box needs to operate continuously at a high temperature of 200-300℃. However, the existing technology has the following shortcomings: (1) Heat is lost in large quantities through radiation and convection, resulting in serious energy waste. At the same time, it causes the ambient temperature in the workshop to rise, affecting the operating comfort of the staff; (2) The temperature of the outer surface of the core box often reaches above 200℃, which can easily cause the coated sand to solidify prematurely on the outside of the core box (sand formation), block the exhaust channel, and cause defects such as sand shortage and looseness in the sand core, resulting in a decrease in the yield; (3) There is a serious risk of burns on the high-temperature surface, which poses certain production safety problems; (4) At present, heat insulation solutions such as heat insulation cotton and asbestos board are commonly used, which have problems such as low heat insulation efficiency, easy aging, and difficult maintenance. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a coated sand casting hot core box device with aerogel felt, which solves the technical problems of serious heat loss, high energy consumption, prominent safety hazards and inefficiency of existing heat insulation solutions in hot core boxes.

[0005] (II) Technical Solution

[0006] This utility model provides a coated sand casting hot core box device with aerogel felt, which includes: a hot core box body, a nano aerogel felt layer, a press-fit fixing plate and a through-fit fixing component.

[0007] The thermoformed core box body includes a fixed mold and a moving mold. After the fixed mold and the moving mold are joined together, a sand core cavity is formed inside. The surfaces that come into contact with each other after the fixed mold and the moving mold are closed are the parting surfaces.

[0008] The nano-aerogel felt layer includes a first nano-aerogel felt layer disposed on the outer surfaces of the fixed mold and the moving mold, and a second nano-aerogel felt layer disposed on the parting surface;

[0009] The pressing-type fixing plate covers the outside of the first nano-aerogel felt layer, and the through-type fixing component passes through the pressing-type fixing plate and the first nano-aerogel felt layer, with its head end screwed to the surface of the fixed mold or the moving mold; the second nano-aerogel felt layer is glued and fixed to the parting surface of the fixed mold and the moving mold with high-temperature resistant adhesive; the thermal conductivity of the nano-aerogel felt layer is ≤0.020W / m·K.

[0010] The fixed mold contains the cavity, and the moving mold contains the core; after the fixed mold and the moving mold are docked and combined, a sand core cavity is formed inside.

[0011] According to a preferred embodiment of the present invention, the nano-aerogel felt layer is silane-modified silica aerogel, alumina aerogel, or zirconium oxide aerogel; the pressure-fitting fixing plate is a metal plate.

[0012] According to a preferred embodiment of the present invention, the through-type fixing component is a bolt.

[0013] According to a preferred embodiment of the present invention, the first nano-aerogel felt layer is provided with holes aligned with the pin holes on the thermal core box body, and the diameter of the holes is 5mm larger than the diameter of the pin holes to ensure that the pin holes are completely exposed without obstruction; the edges of the holes in the first nano-aerogel felt layer are bonded and fixed to the thermal core box body with high-temperature resistant aluminum foil adhesive.

[0014] According to a preferred embodiment of the present invention, the two first nano-aerogel felt layers are overlapped by 1-2 cm at the splicing point of the two adjacent outer surfaces of the fixed mold or the moving mold, and the overlapping surfaces at the splicing point are fixed by high-temperature resistant adhesive.

[0015] According to a preferred embodiment of the present invention, the pressing-type fixing plate is a flat plate, an L-shaped plate, or a U-shaped plate. When the pressing-type fixing plate is a flat plate, one pressing-type fixing plate is provided on each outer side of the fixed mold or the moving mold; when the pressing-type fixing plate is an L-shaped plate, two adjacent outer sides of the fixed mold or the moving mold share one pressing-type fixing plate; when the pressing-type fixing plate is a U-shaped plate, three consecutive outer sides of the fixed mold or the moving mold share one pressing-type fixing plate.

[0016] According to a preferred embodiment of the present invention, the pressing-type fixing plate is provided with first internal threaded holes arranged in a matrix, and a second internal threaded hole corresponding to the first internal threaded hole is provided on the outer side of the fixed mold or the moving mold; the through-type fixing component passes through the first internal threaded hole on the pressing-type fixing plate, and its head end is screwed into the second internal threaded hole on the surface of the fixed mold or the moving mold; the first internal threaded hole and the second internal threaded hole are evenly distributed in a matrix.

[0017] According to a preferred embodiment of the present invention, the through-type fixing component is a countersunk bolt of M6-M10 specification, the row spacing and pin spacing of the countersunk bolt is 10cm, and the edge of the countersunk bolt is not less than 20mm from the edge of the pin hole.

[0018] According to a preferred embodiment of the present invention, the thickness of the first nano-aerogel felt layer is 2-5 cm; the thickness of the second nano-aerogel felt layer is 0.5-2 cm.

[0019] According to a preferred embodiment of the present invention, the surface of the press-fitted fixing plate facing the first nano-aerogel felt layer is provided with a high-temperature radiation-reflective ceramic coating, the thickness of which is 0.1-0.3 mm. This ceramic coating is, for example, a SiO2-ZrO2-based heat-reflective coating.

[0020] (III) Beneficial Effects

[0021] The main technical effects of this utility model are as follows:

[0022] (1) By installing a nano-aerogel felt layer on the body of the heating core box, the heat loss of the heating core box can be greatly reduced, the heating time and energy consumption can be shortened, and the cost can be saved.

[0023] (2) Reduce the temperature of the outer surface of the heat-formed core box body, reduce the risk of burns, and improve the working environment of the production workshop.

[0024] (3) Reduce heat diffusion to the surroundings, avoid premature curing (sanding) of the coated sand on the outside of the core box and blockage of the exhaust channel caused by excessively high ambient temperature of the hot core box, and further avoid defects such as sand shortage and looseness of the sand core, and reduced yield.

[0025] (4) This utility model adopts a pressing type fixing plate and a through-type fixing component, which can replace the aerogel layer with different thickness or different heat insulation efficiency according to the heat insulation performance of the nano aerogel felt layer. It is easy to disassemble, simple to maintain, has a long service life, and low manufacturing and maintenance costs.

[0026] (5) The matrix-style uniform distribution allows the nano-aerogel felt to fully adhere to the surface of the core box with almost no gaps, reducing air gaps.

[0027] (6) Further, a high-temperature radiation-reflective ceramic coating is applied to the inner surface of the press-fitted fixing plate (an anti-corrosion coating can also be applied to the outer surface of the press-fitted fixing plate). This reflects the heat radiation emitted by the nano-aerogel felt back to the core box side, preventing heat loss through the fixing plate (metal conducts heat quickly), thus doubling the insulation effect of the insulation layer. The press-fitted fixing plate is a metal plate, which will deform due to high-temperature oxidation and thermal expansion and contraction over a long period of time. The ceramic coating is resistant to high temperatures (usually above 500℃), forming a protective barrier, reducing the corrosion of the fixing plate by high temperatures, and extending its service life. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 .

[0029] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 .

[0030] Figure 3 This is a partial structural diagram of the present invention. Figure 1 .

[0031] Figure 4 This is a partial structural diagram of the present invention. Figure 2 . Detailed Implementation

[0032] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 As shown, this utility model provides a hot core-forming box device for coated sand casting with aerogel felt, which includes a hot core-forming box body 1, a nano-aerogel felt layer 6, a pressing-type fixing plate 3, and a through-type fixing component 4. The hot core-forming box body is composed of a fixed mold 11 and a moving mold 12. The fixed mold 11 contains a cavity, and the moving mold 12 contains a core. After the fixed mold 11 and the moving mold 12 are joined together, a sand core cavity is formed inside. The surfaces of the fixed mold 11 and the moving mold 12 that are in contact with each other after the molds are closed are the parting surfaces. Depending on the different positions of the nano-aerogel felt layer 6 on the fixed mold 11 and the moving mold 12, it can be divided into a first nano-aerogel felt layer 61 set on the outer surface of the fixed mold and the moving mold, and a second nano-aerogel felt layer 62 set on the parting surface (e.g., ...). Figure 2 As shown). Figure 1 and Figure 2As shown, the pressing-type fixing plate 3 covers the outside of the first nano-aerogel felt layer 61, and the through-type fixing component 4 passes through the pressing-type fixing plate 3 and the first nano-aerogel felt layer 61, with its head screwed to the surface of the fixed mold 11 or the moving mold 12 (the surface of the fixed mold 11 or the moving mold 12 has an internal threaded hole of a certain depth). The second nano-aerogel felt layer 62 is glued and fixed to the parting surface of the fixed mold 11 and the moving mold 12 with high-temperature resistant adhesive to prevent heat from escaping from the parting surface of the fixed mold 11 and the moving mold 12. The first nano-aerogel felt layer 61 is set on the outside of the thermal core box body 1, and its thickness can be slightly larger, as long as it does not affect the mold closing and opening of the thermal core box body 1. The second nano-aerogel felt layer 62 is set on the parting surface, and in order to reduce the impact on the mold closing process of the fixed mold 11 and the moving mold 12, its thickness can be slightly thinner, such as 0.5-2cm. The thermal conductivity of the nano-aerogel felt layer 6 is ≤0.020W / m·K. Preferably, the nano-aerogel felt layer 6 is silane-modified silica aerogel, alumina aerogel, or zirconia aerogel. These aerogel materials have outstanding core advantages: they have excellent high-temperature resistance, which can adapt to the working temperature environment of the hot core-making process, and they have extremely low heat transfer coefficients, which can effectively reduce heat loss inside the core box, maintain stable temperature inside the cavity, and thus ensure the solidification quality and molding accuracy of the sand core, while reducing energy consumption.

[0034] The pressing-type fixing plate 3 is a metal plate, preferably a stainless steel plate. The through-type fixing component 4 is a long bolt that can pass through the pressing-type fixing plate 3 and the first nano-aerogel felt layer 61, and its head end is screwed to the surface of the fixed mold 11 or the moving mold 12. On the side of the moving mold 12 where the ejector pin fixing plate is located, the first nano-aerogel felt layer 61 also has a hole 611 that is aligned with the ejector pin hole 121 on the hot core box body. The diameter of the hole 611 is 5mm larger than the diameter of the ejector pin hole 121 to ensure that the ejector pin hole is completely exposed and not blocked, so that the ejector pin can smoothly push the molded sand core out of the sand core cavity. In order to ensure that the edge of the hole 61 of the first nano-aerogel felt layer 61 aligned with the ejector pin hole 121 does not warp and affect the movement of the ejector pin, the edge of the hole 61 needs to be tightly attached to the surface of the moving mold 12 with high-temperature resistant aluminum foil adhesive, and the hole 61 should be at a certain distance from the through-type fixing component 4.

[0035] The first nano-aerogel felt layer 61 covering the outside of the fixed mold 11 and the moving mold 12 is cut according to the outline and size of the fixed mold 11 and the moving mold 12. The two first nano-aerogel felt layers 61 located on the two adjacent outer sides of the fixed mold 11 or the moving mold 12 overlap by about 1-2 cm to avoid forming a heat leakage gap. The overlapping surfaces of the two first nano-aerogel felt layers 61 are bonded and fixed with high-temperature resistant aluminum foil adhesive.

[0036] The pressing-type fixing plate 3 is designed according to the outline and dimensions of the fixed mold 11 and the moving mold 12. It can be a flat plate, an L-shaped plate, or a U-shaped plate. When the pressing-type fixing plate 3 is a flat plate, one pressing-type fixing plate 3 is provided on each outer side of the fixed mold 11 or the moving mold 12. When the pressing-type fixing plate is an L-shaped plate, two adjacent outer sides of the fixed mold 11 or the moving mold 12 share one pressing-type fixing plate 3. When the pressing-type fixing plate 3 is a U-shaped plate, three consecutive outer sides of the fixed mold 11 or the moving mold 12 share one pressing-type fixing plate. The main function of the pressing-type fixing plate 3 is to enhance the sealing performance, protect the thermal core box body 1 and the nano-aerogel felt layer 6, reduce air ingress, prevent the metal surface of the thermal core box body 1 from oxidizing and rusting due to air at high temperatures, and prevent the inside of the nano-aerogel felt layer 6 from getting damp.

[0037] Combination Figure 3 As shown, the pressing-type fixing plate 3 has first internal threaded holes 31 arranged in a matrix, and second internal threaded holes 102 aligned with the first internal threaded holes 31 are provided on the outer side of the fixed mold 11 or the moving mold 12. The through-type fixing component 4 passes through the first internal threaded holes 31 on the pressing-type fixing plate 3, passes through the first nano-aerogel felt layer 61, and the head end of the through-type fixing component 4 is screwed into the second internal threaded hole 102 on the surface of the fixed mold 11 or the moving mold 12. The first internal threaded holes 31 and the second internal threaded holes 102 are evenly distributed in a matrix. The through-type fixing component 4 is a countersunk bolt of M6-M10 specification. The row spacing and particle spacing of the countersunk bolt are preferably 10cm, and the edge of the countersunk bolt is not less than 20mm from the edge of the ejector pin hole to avoid obstructing the action of the ejector pin pushing the sand core. This through-type (bolt passing through the fixing plate + nano-aerogel felt + hot core box) combined with the matrix distribution can evenly distribute the fastening pressure and avoid local warping or displacement of the nano-aerogel felt 6. Furthermore, since the hot-formed core box requires frequent mold opening and closing, and repeated heating and cooling, this fixing method can resist the stress caused by thermal expansion and contraction, prevent the nano-aerogel felt 6 from falling off, and ensure long-term stable use. The head of the countersunk bolt is recessed into the groove of the pressure-type fixing plate 3, so that the surface of the pressure-type fixing plate 3 remains flat, which can better cooperate with the ejection mechanism and does not affect the operation of the ejection mechanism.

[0038] like Figure 4As shown, a high-temperature radiation-reflective ceramic coating 32 is provided on the surface of the pressed-on fixing plate 3 facing the first nano-aerogel felt layer 61. The thickness of the high-temperature radiation-reflective ceramic coating 32 is 0.1-0.3 mm, specifically a SiO2-ZrO2-based heat-reflective coating. The high-temperature radiation-reflective ceramic coating 32 can reflect the heat radiation emitted by the nano-aerogel felt back to the core box side, preventing heat loss through the fixing plate (metal has fast thermal conductivity), thus doubling the heat insulation effect of the nano-aerogel felt layer 6. The pressed-on fixing plate 3 is a metal plate, which will deform due to high-temperature oxidation and thermal expansion and contraction over a long period of time. The ceramic coating is resistant to high temperatures (usually above 500℃) and may form an inert protective barrier, reducing the corrosion of the fixing plate by high temperatures and extending its service life.

[0039] This utility model adopts a pressing-type fixing plate and a through-type fixing component, which can replace the aerogel layer with different thicknesses or different insulation efficiencies according to the thermal insulation performance of the nano aerogel felt layer. It is easy to disassemble, simple to maintain, has a long service life, and low manufacturing and maintenance costs.

[0040] Experimental tests showed that when the internal working temperature of the thermal core box was 220℃, the external surface temperature of the thermal core box dropped to 90-130℃, significantly reducing the risk of burns, decreasing heat loss by more than 60%, shortening the heating time by about 33%, reducing the energy consumption of the heating system by 25%, and improving the workshop operating environment. The cost of each set of this new thermal core box is only about 140 yuan, making it low-cost, simple to modify, and highly durable.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions, or combinations of technical features in the above embodiments that do not conflict with each other, can be made in accordance with the manner described in the embodiments. These modifications, substitutions or combinations do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for hot core-forming box in sand casting with aerogel felt, characterized in that, include: Thermoformed core box body, nano-aerogel felt layer, press-fitted fixing plate and through-fit fixing assembly; The thermoformed core box body includes a fixed mold and a moving mold. After the fixed mold and the moving mold are docked and combined, a sand core cavity is formed inside. The surfaces where the fixed mold and the moving mold come into contact after they are closed are called the parting surfaces. The nano-aerogel felt layer includes a first nano-aerogel felt layer disposed on the outer surfaces of the fixed mold and the moving mold, and a second nano-aerogel felt layer disposed on the parting surface; The pressing-type fixing plate covers the outside of the first nano-aerogel felt layer, and the through-type fixing component passes through the pressing-type fixing plate and the first nano-aerogel felt layer, with its head end screwed to the surface of the fixed mold or the moving mold; the second nano-aerogel felt layer is glued and fixed to the parting surface of the fixed mold and the moving mold with high-temperature resistant adhesive; the thermal conductivity of the nano-aerogel felt layer is ≤0.020W / m·K.

2. The hot core box apparatus for coated sand casting as claimed in claim 1, characterized in that, The nano-aerogel felt layer is silane-modified silica aerogel, alumina aerogel, or zirconium oxide aerogel; the pressure-fitting fixing plate is a metal plate.

3. The coated sand casting hot core box apparatus according to claim 1, characterized in that, The first nano-aerogel felt layer has holes aligned with the pin holes on the thermal core box body, and the diameter of the holes is 5mm larger than the diameter of the pin holes; the edges of the holes in the first nano-aerogel felt layer are bonded and fixed to the thermal core box body with high-temperature resistant aluminum foil adhesive.

4. The coated sand casting hot core box apparatus according to claim 1, characterized in that, The two first nano-aerogel felt layers are set at the joint of two adjacent outer sides of the fixed mold or moving mold, with an overlap of 1-2 cm, and the overlapping surfaces at the joint are fixed together with high-temperature resistant adhesive.

5. The coated sand casting hot core box apparatus according to claim 1, characterized in that, The pressing-type fixing plate is a flat plate, an L-shaped plate, or a U-shaped plate.

6. The coated sand casting hot core box apparatus according to claim 1, characterized in that, The pressing-type fixing plate is provided with first internal threaded holes arranged in a matrix, and a second internal threaded hole corresponding to the first internal threaded hole is provided on the outer side of the fixed mold or moving mold; the through-type fixing component passes through the first internal threaded hole on the pressing-type fixing plate, and its head end is screwed into the second internal threaded hole on the surface of the fixed mold or moving mold; the first internal threaded hole and the second internal threaded hole are evenly distributed in a matrix.

7. The coated sand casting hot core box apparatus according to claim 3, characterized in that, The through-type fixing component is a countersunk bolt of M6-M10 specification. The row spacing and pin spacing of the countersunk bolt are 10cm, and the edge of the countersunk bolt is not less than 20mm from the edge of the pin hole.

8. The coated sand casting hot core box apparatus according to claim 1, characterized in that, The thickness of the first nano-aerogel felt layer is 2-5 cm; the thickness of the second nano-aerogel felt layer is 0.5-2 cm.

9. The coated sand casting hot core box apparatus according to claim 1, characterized in that, The surface of the press-fitted fixing plate facing the first nano-aerogel felt layer is provided with a high-temperature radiation-reflective ceramic coating with a thickness of 0.1-0.3 mm.

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