Ingot mold cover for vacuum ingot mold

Abstract

The invention belongs to the field of special metallurgy, and relates to an ingot mold cover for a vacuum ingot mold. The ingot mold cover comprises a cover body provided with a central through hole, the shape of the cross section of the cover body is consistent with that of the cross section of the top of the vacuum ingot mold, the outer edge and the inner edge of the cover body both protrude downwards to form an outer edge and an inner edge of an annular structure, and the outer edge is higher than the inner edge. The part, lower than the inner edge, of the outer edge is used for clamping the outer side of the top of a vacuum ingot mold so as to fix the ingot mold cover, the lower end of the cover body covers the upper end of the vacuum ingot mold through the outer edge, and an ingot mold cover reflection heat insulation layer is arranged on the lower surface of the cover body between the outer edge and the inner edge and is of an annular structure located between the outer edge and the inner edge. According to the method, heat loss at the top of the vacuum ingot casting riser can be greatly reduced, the heat preservation capacity of the riser can be enhanced, impurities in alloy melt can be further removed, and the ingot casting yield and quality are improved by ensuring sequential solidification and reducing dendritic crystal bridging caused by heterogeneous nucleation and improving the ingot casting shrinkage cavity and porosity defects.

Description

Technical Field

[0001] The invention belongs to the field of special metallurgy and relates to an ingot mold cover for a vacuum ingot casting mold. Background Art

[0002] Vacuum induction melting is a process that uses an energized induction coil to generate electromagnetic induction under vacuum conditions, causing the metal charge in the crucible to generate eddy current heat and melt. During the melting process, electromagnetic stirring is used to achieve uniformity and precise control of the alloy melt composition. Vacuum induction melting technology is an important guarantee for the production of high-end special steels. It provides maximum control over the chemical composition of the alloy, prevents the solution from contacting hydrogen, oxygen, and nitrogen in the atmosphere, and can significantly reduce the inclusion content.

[0003] However, the vacuum ingots prepared by this method often have serious shrinkage cavities and porosity defects. This is because the alloy liquid at the riser on the top of the ingot is directly exposed to the vacuum environment during vacuum pouring and solidification, and dissipates heat to the surrounding environment through radiation heat exchange, causing the top alloy liquid to solidify earlier, making it impossible to feed the shrinkage of the unsolidified area at the bottom of the ingot. The shrinkage feeding effect of the riser cannot be fully exerted, and large-sized shrinkage cavities and shrinkage defects are easily formed in the center and upper part of the ingot, resulting in a low ingot yield and increased production costs.

[0004] Under conventional atmospheric pouring conditions, after pouring, a heat-generating and heat-insulating agent is added to the top of the riser to ensure that the alloy liquid at the riser solidifies last and enhances shrinkage compensation. However, there is no condition to add a heat-generating and heat-insulating agent during vacuum pouring and solidification. Due to the limitation of the pouring channel, the top of the riser is often directly exposed to the vacuum environment. Only insulation measures can be added to the side wall of the riser to improve the shrinkage compensation capacity of the riser, and the effect is extremely limited. Therefore, it is very necessary to configure a corresponding ingot mold cover for vacuum casting ingots, so as to effectively reduce the heat loss caused by thermal radiation from the top liquid surface, which can not only enhance the shrinkage compensation effect of the riser, but also prolong the solidification time of the alloy melt, so that inclusions can float to the riser more fully and be removed. Summary of the invention

[0005] The object of the present invention is to provide an ingot mold cover for a vacuum ingot mold, which can significantly reduce the heat loss at the top of the vacuum ingot riser, enhance the thermal insulation capacity of the riser, and further remove impurities in the alloy melt, thereby improving the shrinkage cavity and shrinkage defects of the ingot and improving the yield rate and quality of the ingot by ensuring sequential solidification and reducing dendrite bridging caused by heterogeneous nucleation.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] A ingot mold cover for a vacuum ingot mold comprises a cover body provided with a central through hole, the cross-sectional shape of the cover body is consistent with the cross-sectional shape of the top of the vacuum ingot mold, the outer edge and the inner edge of the cover body both protrude downward to form an outer edge and an inner edge of the ingot mold cover of an annular structure, the height of the outer edge of the ingot mold cover is greater than the height of the inner edge of the ingot mold cover, the portion of the outer edge of the ingot mold cover that is lower than the inner edge of the ingot mold cover is used to clamp the outer side of the top of the vacuum ingot mold to fix the ingot mold cover, the lower end of the cover body is buckled on the upper end of the vacuum ingot mold through the outer edge of the ingot mold cover, an ingot mold cover reflective insulation layer is provided on the lower surface of the cover body between the outer edge of the ingot mold cover and the inner edge of the ingot mold cover, the ingot mold cover reflective insulation layer is an annular structure located between the outer edge of the ingot mold cover and the inner edge of the ingot mold cover, and the lower surface of the ingot mold cover reflective insulation layer is in close contact with the top of the vacuum ingot mold.

[0008] The ingot mold cover for the vacuum ingot casting mold is an integrated structure consisting of a cover body, a sprue, a chute, and a pouring cup. A sprue is provided at the top center of the disc-shaped cover body, the upper port of the central through hole is connected to the sprue, the inner diameter of the sprue is consistent with the aperture of the central through hole, the lower port of the central through hole corresponds to the inner cavity of the vacuum ingot casting mold, the side opening of the sprue is connected to one end of the chute, and an outward-expanding pouring cup is provided on the upper part of the other end of the chute.

[0009] The vacuum ingot casting mold is covered with an ingot mold, the top of the sprue is closed, and a sprue reflective heat insulation layer is arranged on the lower surface of the closed top of the sprue.

[0010] The vacuum casting ingot mold cover is provided with a sprue top insulation layer between the closed top lower surface of the sprue and the sprue reflective insulation layer, or the sprue top insulation layer is provided on the sprue top upper surface; a sprue annular insulation layer is provided around the sprue.

[0011] The ingot mold cover for the vacuum casting mold has an overall inclined chute, and one end of the chute with an outward-expanding pouring cup is higher than the end connected to the straight runner; a slag retaining plate is provided on the inner bottom surface of the chute near one end of the outward-expanding pouring cup, and the slag retaining plate is located below the pouring cup and biased to the side of the straight runner; a filter screen is provided at the cross-section position of the chute near one end of the outward-expanding pouring cup, and the filter screen is fixed by a filter screen slot built into the chute, and the filter screen is placed behind the slag retaining plate, and the filter screen is a ceramic fiber filter screen.

[0012] The ingot mold cover for the vacuum ingot casting mold is an integrated structure consisting of a cover body, a sprue, a chute, and a pouring cup. A sprue is provided at the top center of the disc-shaped cover body, the upper port of the central through hole is connected to the sprue, the inner diameter of the sprue is consistent with the aperture of the central through hole, the lower port of the central through hole corresponds to the inner cavity of the vacuum ingot casting mold, the top opening of the sprue is connected to one end of the chute, and an outward-expanding pouring cup is provided on the upper part of the other end of the chute.

[0013] The vacuum ingot mold is used for an ingot mold cover, and the top opening of the sprue is connected to the chute. The chute is a tubular structure that is arranged obliquely as a whole. The chute is provided with an outward-expanded pouring cup with one end higher than the end connected to the sprue. At least one inclined partition is arranged on the upper inner surface of the inclined tubular structure of the chute, and a chute reflective insulation layer is arranged on the inner surface of the chute and the lower surface of the partition.

[0014] The vacuum casting ingot mold is used for an ingot mold cover, and a center through hole chamfer is arranged on the top of the center through hole so that the cross section of the center through hole is V-shaped.

[0015] The vacuum casting mold uses an ingot mold cover, and an ingot mold cover insulation layer is added between the lower surface of the cover body and the ingot mold cover reflective insulation layer, or the ingot mold cover insulation layer is arranged on the upper surface of the cover body.

[0016] The vacuum casting ingot mold is used for an ingot mold cover, and the reflective heat insulation layer of the ingot mold cover is sprayed with reflective heat insulation paint or pasted with anti-radiation heat insulation board, or the two are used in combination.

[0017] The design concept of the present invention is:

[0018] The present invention reduces the heat loss at the top of the ingot by adding an ingot mold cover at the top of the riser. Since the heat exchange in a vacuum environment is mainly carried out in the form of heat radiation, a reflective heat insulation layer is arranged on the lower surface of the ingot mold cover and the top of the sprue to block the heat radiation from the top of the ingot and the outside, and to gather the heat in the riser, so that the riser position solidifies last, ensuring sequential solidification from bottom to top.

[0019] In addition, the ingot mold cover should have an alloy pouring port to complete the vacuum pouring process, and it is best to further remove the inclusions generated during the vacuum induction melting process, thereby reducing the dendrite bridging caused by heterogeneous nucleation and improving the internal quality of the ingot. Therefore, the straight runner and the chute with a slag plate filter are integrated with the mold cover into an ingot mold cover for a vacuum ingot mold to achieve the three functions of pouring, heat preservation and improving the purity of the alloy.

[0020] The advantages and beneficial effects of the present invention are:

[0021] ① The present invention can improve the shrinkage cavity and shrinkage defects of ingot casting, and improve the yield rate and internal quality of ingot casting;

[0022] ② The present invention can reduce the inclusion content in the ingot and improve the purity of the alloy;

[0023] ③ The ingot mold cover of the present invention does not need to change the existing mold and process when used, and is simple to operate and low in cost;

[0024] ④ The ingot mold cover of the present invention has a wide range of applications and is suitable for ingot molds of different types of alloys and different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the existing vacuum casting structure.

[0026] Figure 2 It is a schematic diagram of the ingot mold cover of the present invention being applied to an existing vacuum ingot casting mold.

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the ingot mold cover A of the present invention.

[0028] Figure 4 It is a front view of the central section of the ingot mold cover A of the present invention.

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the ingot mold cover B of the present invention.

[0030] Figure 6 It is a front view of the central section of the ingot mold cover B of the present invention.

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of the ingot mold cover C of the present invention.

[0032] Figure 8 It is a front view of the central section of the ingot mold cover C of the present invention.

[0033] In the figure, I—ingot mold cover, II—riser mold, III—ingot mold, 1—cover body, 2—sprue, 3—chute, 4—pouring cup, 11—ingot mold cover reflective insulation layer, 12—ingot mold cover insulation layer, 13—ingot mold cover outer edge, 14—ingot mold cover inner edge, 15—ingot mold cover handle, 16—center through hole, 17—center through hole chamfer, 21—sprue reflective insulation layer, 22—sprue top insulation layer, 23—sprue annular insulation layer, 25—sprue handle, 31—chute reflective insulation layer, 32—filter net, 33—filter net slot, 34—slag baffle, 35—partition. DETAILED DESCRIPTION

[0034] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0035] like Figure 1 As shown, the existing vacuum ingot mold is usually composed of a riser mold II and an ingot mold III. The ingot mold III of a larger ingot will be split into an ingot body mold and a bottom mold. Some ingots will not be equipped with a separate riser mold II, but the unified feature of the vacuum ingot mold is that there is no ingot mold cover because pouring needs to be done on the top.

[0036] like Figure 2 As shown, the present invention applies the ingot mold cover to the existing vacuum ingot mold. When in use, the ingot mold cover I of the present invention is directly placed above the riser mold II of the vacuum ingot mold without changing the existing vacuum ingot mold structure. After completing pouring and solidification in a vacuum environment, the device can be removed and the ingot mold cover can be reused.

[0037] Example 1

[0038] As Figure 3-Figure 4 shown, the structure of the ingot mold cover A for the vacuum ingot mold of the present invention includes an integral structure composed of a cover body 1, a sprue 2, a chute 3, and a pouring cup 4. A sprue 2 is provided at the center of the top of the disc-shaped cover body 1. The cover body 1 is provided with a central through hole 16. The upper port of the central through hole 16 is communicated with the sprue 2. The inner diameter of the sprue 2 is the same as the aperture of the central through hole 16. The lower port of the central through hole 16 corresponds to the inner cavity of the vacuum ingot mold. One end of the chute 3 is connected to the side opening of the sprue 2, and an outward-expanded pouring cup 4 is provided at the upper part of the other end of the chute 3. During vacuum pouring, the alloy liquid sequentially enters the ingot mold cavity of the ingot mold III through the pouring cup 4, the chute 3, and the sprue 2.

[0039] The cross-sectional shape of the cover body 1 is the same as the cross-sectional shape of the top of the vacuum ingot mold. Both the outer edge and the inner edge of the cover body 1 bulge downward to form an ingot mold cover outer edge 13 and an ingot mold cover inner edge 14 with an annular structure. The height of the ingot mold cover outer edge 13 is greater than the height of the ingot mold cover inner edge 14. The part of the ingot mold cover outer edge 13 lower than the ingot mold cover inner edge 14 is used to clamp the outside of the top of the vacuum ingot mold to fix the ingot mold cover I. The lower end of the cover body 1 is covered and buckled on the upper end of the vacuum ingot mold through the ingot mold cover outer edge 13. An ingot mold cover reflective heat insulation layer 11 is provided on the lower surface of the cover body 1 between the ingot mold cover outer edge 13 and the ingot mold cover inner edge 14. The ingot mold cover reflective heat insulation layer 11 is an annular structure located between the ingot mold cover outer edge 13 and the ingot mold cover inner edge 14. The lower surface of the ingot mold cover reflective heat insulation layer 11 is closely attached to the top of the vacuum ingot mold.

[0040] In this embodiment, a separate riser mold II is provided for the vacuum ingot mold. The cross-sectional shape of the cover body 1 is the same as the cross-sectional shape of the top of the riser mold II. Both the outer edge and the inner edge of the cover body 1 bulge downward to form an ingot mold cover outer edge 13 and an ingot mold cover inner edge 14 with an annular structure. The height of the ingot mold cover outer edge 13 is greater than the height of the ingot mold cover inner edge 14. The part of the ingot mold cover outer edge 13 lower than the ingot mold cover inner edge 14 is used to clamp the outside of the riser mold II to fix the ingot mold cover I. The lower end of the cover body 1 is covered and buckled on the upper end of the riser mold II through the ingot mold cover outer edge 13. An ingot mold cover reflective heat insulation layer 11 is provided on the lower surface of the cover body 1 between the ingot mold cover outer edge 13 and the ingot mold cover inner edge 14. The ingot mold cover reflective heat insulation layer 11 is an annular structure located between the ingot mold cover outer edge 13 and the ingot mold cover inner edge 14. The lower surface of the ingot mold cover reflective heat insulation layer 11 is closely attached to the top of the riser mold II.

[0041] In order to enhance the heat preservation effect of the ingot mold cover, an ingot mold cover heat preservation layer 12 can be added between the lower surface of the cover body 1 and the ingot mold cover reflective heat insulation layer 11, or the ingot mold cover heat preservation layer 12 can be provided on the upper surface of the cover body 1.

[0042] The reflective insulation layer 11 of the ingot mold cover can be selected by spraying reflective insulation coating or pasting anti-radiation insulation board based on comprehensive consideration of economy and functionality. The reflective insulation effect is best when the two are used in combination. The existence of this structure can make the ingot mold cover absorb very little radiant heat energy and reflect most of the heat back into the riser, thereby improving the insulation effect of the riser and prolonging the solidification time of the alloy at the top of the ingot.

[0043] The top of the sprue 2 is closed, and a sprue reflective insulation layer 21 is provided on the lower surface of the closed top of the sprue 2. The sprue reflective insulation layer 21 plays the same role as the ingot mold cover reflective insulation layer 11, and its purpose is to reflect most of the heat radiated upward from the top of the ingot through the central through hole 16 back to the riser, thereby reducing the heat loss of the riser.

[0044] In order to enhance the thermal insulation effect of the sprue, a sprue top thermal insulation layer 22 can be added between the closed top lower surface of the sprue 2 and the sprue reflective thermal insulation layer 21, or the sprue top thermal insulation layer 22 can be set on the top upper surface of the sprue 2. In addition, a sprue annular thermal insulation layer 23 is set around the sprue 2 on the outside.

[0045] The chute 3 is tilted as a whole, and one end of the chute 3 provided with the outward-expanding pouring cup 4 is higher than the end connected to the sprue 2. A slag retaining plate 34 is provided on the inner bottom surface of the chute 3 near the end of the outward-expanding pouring cup 4, and the slag retaining plate 34 is located below the pouring cup 4 and biased to the side of the sprue 2. A filter screen 32 is provided at the cross-section position of the chute near the end of the outward-expanding pouring cup 4, and the filter screen 32 is fixed by the filter screen slot 33 built into the chute 3, and the filter screen 32 is placed behind the slag retaining plate 34, and the filter screen 32 is a ceramic fiber filter screen.

[0046] An ingot mold cover handle 15 is provided on the top of the cover body 1, and a sprue handle 25 is provided on the top of the sprue 2, for facilitating the transportation of the ingot mold cover.

[0047] The implementation results show that the use of this structure can greatly improve the thermal insulation performance of the riser, significantly improve the shrinkage defects of vacuum casting ingots, and improve the purity of alloy ingots.

[0048] Example 2

[0049] like Figure 5-Figure 6As shown, the ingot mold cover B structure for the vacuum ingot mold of the present invention includes an integrated structure consisting of a cover body 1, a sprue 2, a chute 3, and a pouring cup 4. The sprue 2 is provided at the top center of the disc-shaped cover body 1, and the cover body 1 is provided with a central through hole 16. The upper end of the central through hole 16 is connected to the sprue 2. The inner diameter of the sprue 2 is consistent with the aperture of the central through hole 16. The lower end of the central through hole 16 corresponds to the inner cavity of the vacuum ingot mold. The top opening of the sprue 2 is connected to one end of the chute 3, and the upper part of the other end of the chute 3 is provided with an outward-expanding pouring cup 4. During vacuum casting, the alloy liquid enters the ingot mold cavity of the ingot mold III through the pouring cup 4, the chute 3, and the sprue 2 in sequence.

[0050] The cross-sectional shape of the cover body 1 is consistent with the cross-sectional shape of the top of the vacuum ingot mold. The outer edge and the inner edge of the cover body 1 both protrude downward to form an annular structure of the ingot mold cover outer edge 13 and the ingot mold cover inner edge 14. The height of the ingot mold cover outer edge 13 is greater than the height of the ingot mold cover inner edge 14. The part of the ingot mold cover outer edge 13 lower than the ingot mold cover inner edge 14 is used to clamp the outer side of the top of the vacuum ingot mold to fix the ingot mold cover I. The lower end of the cover body 1 is buckled on the upper end of the vacuum ingot mold through the ingot mold cover outer edge 13. The ingot mold cover reflective insulation layer 11 is arranged on the lower surface of the cover body 1 between the ingot mold cover outer edge 13 and the ingot mold cover inner edge 14. The ingot mold cover reflective insulation layer 11 is an annular structure located between the ingot mold cover outer edge 13 and the ingot mold cover inner edge 14. The lower surface of the ingot mold cover reflective insulation layer 11 is tightly attached to the top of the vacuum ingot mold.

[0051] In this embodiment, a separate riser mold II is provided for the vacuum casting ingot mold, and the cross-sectional shape of the cover body 1 is consistent with the cross-sectional shape of the top of the riser mold II, and the outer edge and the inner edge of the cover body 1 both protrude downward to form an ingot mold cover outer edge 13 and an ingot mold cover inner edge 14 of an annular structure, and the height of the ingot mold cover outer edge 13 is greater than the height of the ingot mold cover inner edge 14, and the portion of the ingot mold cover outer edge 13 lower than the ingot mold cover inner edge 14 is used to clamp the ingot mold cover I on the outside of the riser mold II, and the lower end of the cover body 1 is buckled on the upper end of the riser mold II through the ingot mold cover outer edge 13, and an ingot mold cover reflective insulation layer 11 is provided on the lower surface of the cover body 1 between the ingot mold cover outer edge 13 and the ingot mold cover inner edge 14, and the ingot mold cover reflective insulation layer 11 is an annular structure located between the ingot mold cover outer edge 13 and the ingot mold cover inner edge 14, and the lower surface of the ingot mold cover reflective insulation layer 11 is tightly attached to the top of the riser mold II.

[0052] The reflective insulation layer 11 of the ingot mold cover can be selected by spraying reflective insulation coating or pasting anti-radiation insulation board based on comprehensive consideration of economy and functionality. The reflective insulation effect is best when the two are used in combination. The existence of this structure can make the ingot mold cover absorb very little radiant heat energy and reflect most of the heat back into the riser, thereby improving the insulation effect of the riser and prolonging the solidification time of the alloy at the top of the ingot.

[0053] The top opening of the sprue 2 is connected to the chute 3. The chute 3 is a tubular structure that is arranged obliquely as a whole. The chute 3 is provided with an outward-expanded pouring cup 4, one end of which is higher than the end connected to the sprue 2. At least one inclined partition 35 is provided on the upper inner surface of the inclined tubular structure of the chute 3. The inner surface of the chute 3 and the lower surface of the partition 35 are provided with a chute reflective insulation layer 31. The chute reflective insulation layer 31 plays the same role as the ingot mold cover reflective insulation layer 11, and its purpose is to reflect most of the heat radiated upward from the top of the ingot through the central through hole 16 back to the riser, thereby reducing the heat loss of the riser.

[0054] An ingot mold cover handle 15 is provided on the top of the cover body 1 to facilitate the transportation of the ingot mold cover.

[0055] The implementation results show that the use of this structure can greatly improve the thermal insulation performance of the riser and significantly improve the shrinkage defects of vacuum ingots. It is suitable for casting multiple ingots in one furnace where the space is relatively limited and the purity requirements are not particularly high.

[0056] Example 3

[0057] like Figure 7-Figure 8 As shown, the ingot mold cover C structure for the vacuum casting mold of the present invention includes a cover body 1, the cover body 1 is provided with a central through hole 16, and a central through hole chamfer 17 is provided on the top of the central through hole 16, so that the cross-section of the central through hole 16 is V-shaped, which is convenient for the inflow of alloy liquid.

[0058] The cross-sectional shape of the cover body 1 is consistent with the cross-sectional shape of the top of the vacuum ingot mold. The outer edge and the inner edge of the cover body 1 both protrude downward to form an annular structure of the ingot mold cover outer edge 13 and the ingot mold cover inner edge 14. The height of the ingot mold cover outer edge 13 is greater than the height of the ingot mold cover inner edge 14. The part of the ingot mold cover outer edge 13 lower than the ingot mold cover inner edge 14 is used to clamp the outer side of the top of the vacuum ingot mold to fix the ingot mold cover I. The lower end of the cover body 1 is buckled on the upper end of the vacuum ingot mold through the ingot mold cover outer edge 13. The ingot mold cover reflective insulation layer 11 is arranged on the lower surface of the cover body 1 between the ingot mold cover outer edge 13 and the ingot mold cover inner edge 14. The ingot mold cover reflective insulation layer 11 is an annular structure located between the ingot mold cover outer edge 13 and the ingot mold cover inner edge 14. The lower surface of the ingot mold cover reflective insulation layer 11 is tightly attached to the top of the vacuum ingot mold.

[0059] The reflective insulation layer 11 of the ingot mold cover can be selected by spraying reflective insulation coating or pasting anti-radiation insulation board based on comprehensive consideration of economy and functionality. The reflective insulation effect is best when the two are used in combination. The existence of this structure can make the ingot mold cover absorb very little radiant heat energy and reflect most of the heat back into the riser, thereby improving the insulation effect of the riser and prolonging the solidification time of the alloy at the top of the ingot.

[0060] An ingot mold cover handle 15 is provided on the top of the cover body 1 to facilitate the transportation of the ingot mold cover.

[0061] The implementation results show that the use of this structure can improve the thermal insulation performance of the riser, provide better thermal insulation effect at the lowest cost, improve the shrinkage defects of vacuum ingots, and is suitable for ingots with a relatively large cross-sectional area of ​​the top riser mold II and a relatively smooth and slow pouring process.

[0062] Although the above embodiments are all used under vacuum conditions, the present invention can also be used as a measure to improve the heat preservation capacity of the riser during non-vacuum casting.

Claims

1. An ingot mold cover for a vacuum ingot casting mold, It is characterized in that It includes a cover body with a central through hole, the cross-sectional shape of the cover body is consistent with the cross-sectional shape of the top of the vacuum ingot mold, the outer edge and the inner edge of the cover body both protrude downward to form an outer edge of the ingot mold cover and an inner edge of the ingot mold cover of an annular structure, the height of the outer edge of the ingot mold cover is greater than the height of the inner edge of the ingot mold cover, the part of the outer edge of the ingot mold cover that is lower than the inner edge of the ingot mold cover is used to clamp the outer side of the top of the vacuum ingot mold to fix the ingot mold cover, the lower end of the cover body is buckled on the upper end of the vacuum ingot mold through the outer edge of the ingot mold cover, an ingot mold cover reflecting insulation layer is arranged on the lower surface of the cover body between the outer edge of the ingot mold cover and the inner edge of the ingot mold cover, the reflecting insulation layer of the ingot mold cover is an annular structure located between the outer edge of the ingot mold cover and the inner edge of the ingot mold cover, and the lower surface of the reflecting insulation layer of the ingot mold cover is tightly attached to the top of the vacuum ingot mold.

2. The ingot mold cover for vacuum casting mold according to claim 1, It is characterized in that The ingot mold cover for the vacuum ingot casting mold is an integrated structure consisting of a cover body, a sprue, a chute, and a pouring cup. A sprue is provided at the top center of the disc-shaped cover body, the upper port of the center through hole is connected to the sprue, the inner diameter of the sprue is consistent with the aperture of the center through hole, the lower port of the center through hole corresponds to the inner cavity of the vacuum ingot casting mold, the side opening of the sprue is connected to one end of the chute, and an outward-expanding pouring cup is provided on the upper part of the other end of the chute.

3. The ingot mold cover for vacuum ingot casting according to claim 2, It is characterized in that The top of the sprue is closed, and a sprue reflective heat insulation layer is arranged on the lower surface of the closed top of the sprue.

4. The ingot mold cover for vacuum ingot casting according to claim 3, It is characterized in that A sprue top insulation layer is added between the closed top lower surface of the sprue and the sprue reflective insulation layer, or the sprue top insulation layer is set on the sprue top upper surface; a sprue annular insulation layer is set around the sprue.

5. The ingot mold cover for vacuum ingot casting according to claim 2, It is characterized in that The chute is inclined as a whole, and one end of the chute with an outward-expanded pouring cup is higher than the end connected to the straight runner; a slag retaining plate is provided on the inner bottom surface of the chute near the end of the outward-expanded pouring cup, and the slag retaining plate is located below the pouring cup and biased to the side of the straight runner; a filter screen is provided at the cross-section position of the chute near the end of the outward-expanded pouring cup, and the filter screen is fixed by a filter screen slot built into the chute, and the filter screen is placed behind the slag retaining plate, and the filter screen is a ceramic fiber filter screen.

6. The ingot mold cover for vacuum ingot casting according to claim 1, It is characterized in that The ingot mold cover for the vacuum ingot casting mold is an integrated structure consisting of a cover body, a sprue, a chute, and a pouring cup. A sprue is provided at the top center of the disc-shaped cover body, the upper port of the center through hole is connected to the sprue, the inner diameter of the sprue is consistent with the aperture of the center through hole, the lower port of the center through hole corresponds to the inner cavity of the vacuum ingot casting mold, the top opening of the sprue is connected to one end of the chute, and an outward-expanding pouring cup is provided on the upper part of the other end of the chute.

7. The ingot mold cover for vacuum ingot casting according to claim 6, It is characterized in that The top opening of the sprue is connected to the chute, and the chute is a tubular structure that is arranged inclined as a whole. The chute is provided with an outward-expanded pouring cup, one end of which is higher than the end connected to the sprue. At least one inclined partition is arranged on the upper inner surface of the inclined tubular structure of the chute, and a chute reflective insulation layer is arranged on the inner surface of the chute and the lower surface of the partition.

8. The ingot mold cover for vacuum casting mold according to claim 1, It is characterized in that A center through hole chamfer is arranged on the top of the center through hole so that the cross section of the center through hole is in a V shape.

9. The ingot mold cover for vacuum ingot casting according to claim 1, It is characterized in that An ingot mold cover insulation layer is added between the lower surface of the cover body and the reflective insulation layer of the ingot mold cover, or the ingot mold cover insulation layer is arranged on the upper surface of the cover body.

10. The ingot mold cover for vacuum ingot casting according to claim 1, It is characterized in that The reflective heat insulation layer of the ingot mold cover is sprayed with reflective heat insulation paint or pasted with anti-radiation heat insulation board, or the two are used in combination.

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