CN112059118A - Heating and heat-insulating riser sleeve for high alloy steel casting - Google Patents
Heating and heat-insulating riser sleeve for high alloy steel casting Download PDFInfo
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- CN112059118A CN112059118A CN202011181346.8A CN202011181346A CN112059118A CN 112059118 A CN112059118 A CN 112059118A CN 202011181346 A CN202011181346 A CN 202011181346A CN 112059118 A CN112059118 A CN 112059118A
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- heat
- layer
- riser
- insulating
- agent layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/06—Heating the top discard of ingots
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to the technical field of heating and heat-insulating riser sleeves, in particular to a heating and heat-insulating riser sleeve for a high-alloy steel casting, which comprises a riser shell, wherein an easily-cut piece is arranged at the lower end of the riser shell, a protective layer is arranged on the outermost side of the riser shell, a heat-insulating layer is arranged on the inner side of the protective layer, a heating agent layer and a covering agent layer are arranged on the inner side of the heat-insulating layer, the heating agent layer comprises a first heating agent layer and a second heating agent layer, and the covering agent layer and the first heating agent layer are arranged up and; the covering agent layer is arranged, so that the covering agent can cover the surface of molten metal in time; thereby leading the composite material to have good heat preservation performance; by providing the covering agent layer and the first exothermic agent layer in a tapered shape, the weight can be reduced by 41%; the heat-insulating layer is made of riser heat-insulating agent, so that loosening and shrinkage cavities are avoided, and the feeding effect is improved; thereby improving the casting yield and reducing the production cost; the carbon powder is set to be an easily-melted layer, so that the carbon powder is quickly dissolved, the covering agent can be conveniently and timely covered on the surface of the molten metal, and the heat-insulating property is improved.
Description
Technical Field
The invention relates to the technical field of heating and heat-insulating riser sleeves, in particular to a heating and heat-insulating riser sleeve for a high-alloy steel casting.
Background
Risers are often used in the production of steel castings, the risers can avoid the defects of the castings, and a riser sleeve is one of indispensable auxiliary materials in the casting process; the main functions of the riser sleeve are air exhaust, slag discharge and molten steel feeding; in order to ensure that the quality of the produced steel castings is qualified, heating and heat-insulating risers are mostly adopted at present; the heating insulating riser has light weight, high refractoriness, small high-temperature linear shrinkage, high porosity and small heat loss; however, the heat preservation performance of the existing heating and heat preservation riser can not meet the actual production requirement, and the cost is high and the casting yield is low; therefore, how to overcome the above technical problems and disadvantages is a problem to be solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the heating and heat-insulating riser bush for the high-alloy steel casting, which has low production cost and good heat-insulating property and improves the casting yield.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a high alloy steel foundry goods is with heat preservation riser cover that generates heat, includes the riser casing, the lower extreme of riser casing is provided with easily cuts the piece, riser casing outside sets up to the protective layer, the inboard of protective layer is provided with the heat preservation, the inboard of heat preservation is provided with heating agent layer and covering agent layer, heating agent layer contains first heating agent layer and second heating agent layer, covering agent layer and first heating agent layer set up from top to bottom.
Furthermore, a buffer core matched with the inner side of the riser shell for use is arranged on the upper surface of the knock-off core.
Furthermore, the cross section of the buffer core is circular, and the upper surface of the buffer core is of an arc structure; when the molten metal enters the inner cavity, part of the molten metal is contacted with the buffer core and slowly falls down along the arc-shaped structure on the surface of the buffer core, so that the pressure of the molten metal on the bottom of the inner cavity is reduced, and the use safety is improved.
Furthermore, the covering agent layer comprises an easily-melted layer and a covering agent, when the molten metal continuously rises and contacts the easily-melted layer, the easily-melted layer is melted, and the covering agent is poured down to cover the surface of the molten metal, so that the molten metal can be effectively prevented from carrying out thermal radiation and thermal convection through the upper surface of the riser, and the heat loss is reduced; obviously prolong the molten metal solidification time in the riser, improve the shrinkage shape of the riser, increase the safety coefficient of the riser and improve the feeding effect of the riser.
Further, a connecting hole is formed between the covering agent and the second heat generating agent layer; the metal liquid is ensured to continuously contact the heating agent layer in the rising process, so that the metal liquid has continuous heat insulation performance, the temperature of the casting is reduced, the gas generation amount of the riser bush is reduced, and the number of bubbles of the casting is reduced.
Further, the easily-fusible layer is composed of carbon powder; the carbon powder is melted at 180-190 deg.C to be dissolved quickly, so that the covering agent can cover the surface of molten metal in time.
Further, the covering agent is one or more of plant ash, carbonized rice hulls, coke powder, flue ash, thermite, graphite slag or compound heating and heat-preserving covering agent; in the process of delaying the solidification of the molten metal in the riser, the covering agent is used together with the heat-insulating layer, so that the heat-insulating effect of the riser can be improved, the solidification time of the molten metal in the riser is multiplied, the riser has good heat-insulating performance, the temperature of a casting is reduced, and the gas evolution of the riser sleeve is reduced.
Further, the insulating layer is made of a riser insulating agent; the riser heat insulating agent can change the suction shrinkage of the shrinkage cavity of the riser from a V shape to a U shape, so that the looseness and shrinkage cavity are avoided, the feeding effect reaches 30%, the weight of the riser is reduced by 50-75%, the yield is improved by more than 15%, and the chemical components of a casting are ensured to be unchanged.
Furthermore, a connecting hole is formed between the first heating agent layer and the second heating agent layer; when the first heating agent layer burns and passes through the connecting hole to be in contact with the second heating agent layer, the second heating agent layer starts to burn, the first heating agent layer and the second heating agent layer are connected through the connecting hole, air is sucked through the air holes to support combustion, and the combustion efficiency of the first heating agent layer and the second heating agent layer is improved.
The heating and heat-insulating riser sleeve for the high-alloy steel casting has the beneficial effects that:
1. the covering agent layer is arranged on the heating and heat-insulating riser sleeve for the high alloy steel casting, so that the covering agent can cover the surface of molten metal in time; in the process of delaying the solidification of the molten metal in the riser, the covering agent is combined with the heat-insulating layer, so that the heat-insulating effect is obviously improved, the solidification time of the molten metal in the riser is multiplied, the molten metal has good heat-insulating property, the temperature of a casting is reduced and slowed down, the gas evolution of a riser sleeve is reduced, and the number of bubbles of the casting is reduced.
2. The heat-insulating layer of the exothermic heat-insulating riser sleeve for the high-alloy steel casting is made of the riser heat-insulating agent, and the riser heat-insulating agent can change the suction shrinkage of the shrinkage cavity of the riser from a V shape to a U shape, so that the looseness and shrinkage cavity are avoided, the feeding effect is improved, the weight of the riser is reduced, the yield is improved, and the casting yield is improved and the production cost is reduced.
3. Compared with the prior riser bush used on the same casting, the heating and heat preservation riser bush for the high alloy steel casting has the advantages that the conical height is increased by 13 percent, the diameter is reduced by 28 percent, and the weight can be reduced by 41 percent under the condition of the same feeding performance, thereby reducing the cost of the riser bush.
4. The easily-fusible layer of the heating and heat-insulating riser bush for the high-alloy steel casting comprises carbon powder, the melting point of the carbon powder is 180-190 ℃, so that the carbon powder is quickly dissolved, and a covering agent can be conveniently covered on the surface of molten metal in time.
5. A connecting hole is arranged between the covering agent of the heating and heat-insulating riser bush for the high alloy steel casting and the second heating agent layer; the metal liquid is ensured to continuously contact the heating agent layer in the rising process, so that the metal liquid has continuous heat insulation performance, the temperature of the casting is reduced, the gas generation amount of the riser bush is reduced, and the number of bubbles of the casting is reduced.
Drawings
FIG. 1 is a schematic structural view of a heating and heat-insulating riser bush for high alloy steel castings according to the present invention;
wherein: 1-protective layer, 2-insulating layer, 31-fusible layer, 32-covering agent, 41-first heating agent layer, 42-connecting hole, 43-second heating agent layer, 5-easily cut piece and 51-buffer core.
Detailed Description
The exothermic and insulating riser bush for high alloy steel castings according to the present invention will be described in more detail below with reference to the accompanying drawings by way of specific embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The invention is further described below with reference to the accompanying drawings.
Example 1
As shown in figure 1, the exothermic and heat-insulating riser sleeve for the high-alloy steel casting has the advantages of low production cost, good heat-insulating property, reduction of gas generation of the riser sleeve, reduction of the number of bubbles of the casting, improvement of the yield of the casting and the like, and specifically comprises a riser shell, wherein the two ends of the riser shell are thin, and the middle of the riser shell is thick. The outermost side of the riser shell is provided with a protective layer 1, and the inner side of the protective layer 1 is provided with a heat preservation layer 2. The heat preservation layer 2 is made of a riser heat preservation agent, the riser heat preservation agent can change the suction shrinkage of a riser shrinkage cavity from a V shape to a U shape, the looseness and the shrinkage cavity are avoided, the feeding effect is improved, the weight of the riser is reduced by more than 50%, the yield is improved by more than 15%, and the chemical components of a casting are guaranteed to be unchanged; the inner side of the heat-insulating layer 2 is provided with a heating agent layer and a covering agent layer, the heating agent layer comprises a first heating agent layer 41 and a second heating agent layer 43, and the covering agent layer and the first heating agent layer 41 are arranged up and down. Compared with the prior riser bush used on the same casting, the riser bush has the advantages that the height of the taper is increased by 13 percent, the diameter is reduced by 28 percent, and under the condition of the same feeding performance, the weight can be reduced by 41 percent, so that the cost of the riser bush is reduced.
As shown in fig. 1, a connection hole 42 is provided between the first heat generating agent layer 41 and the second heat generating agent layer 43; when the first exothermic agent layer 41 burns and penetrates through the connecting hole 42 to contact with the second exothermic agent layer 43, the second exothermic agent layer 43 starts to burn, the first exothermic agent layer 41 and the second exothermic agent layer 43 are connected through the connecting hole 42, air is sucked through the air holes to support combustion, and the combustion efficiency of the first exothermic agent layer 41 and the second exothermic agent layer 43 is improved.
As shown in fig. 1, the covering agent layer contains a fusible layer 31 and a covering agent 32. The easily-fusible layer 31 is composed of carbon powder, the melting point of the carbon powder is 180-190 ℃, so that the carbon powder is quickly dissolved, and the covering agent 32 can be conveniently covered on the surface of the molten metal in time. The covering agent 32 is one or more of plant ash, carbonized rice hulls, coke powder, flue ash, thermite, graphite slag or compound heating and heat-preserving covering agent; in the process of delaying the solidification of molten metal in the riser, the covering agent 32 has the effect of 30-50 percent, and the insulating sleeve has the effect of 50-70 percent; the covering agent 32 is used together with the heat-insulating layer, so that the heat-insulating effect of the riser can be improved, the solidifying time of molten metal in the riser is increased by times, the riser has good heat-insulating property, the temperature of a casting is reduced and slowed down, and the gas evolution of the riser sleeve is reduced. When the molten metal continuously rises and contacts the fusible layer 31, the fusible layer 31 is melted, and the covering agent 32 is poured down to cover the surface of the molten metal, so that the molten metal can be effectively prevented from carrying out thermal radiation and thermal convection through the upper surface of the riser, and the heat loss is reduced; obviously prolong the molten metal solidification time in the riser, improve the shrinkage shape of the riser, increase the safety coefficient of the riser and improve the feeding effect of the riser. A connection hole 42 is provided between the covering agent 32 and the second heat generating agent layer 43; the metal liquid can be ensured to continuously contact the heating agent layer in the continuous rising process, so that the metal liquid has continuous heat insulation performance, the temperature of the casting is reduced and slowed down, and the gas generation amount of the riser bush is reduced.
As shown in fig. 1, the lower end of the feeder head shell is bonded with an easily-cut piece 5 through hot melt adhesive, the easily-cut piece 5 is matched with the feeder head shell for use, the easily-cut piece 5 is high in strength and good in fire resistance, the defects of cracks and the like generated when the feeder head shell is removed by a gas cutting method are avoided, the thermal node at the root of the feeder head shell is reduced, and the mechanical property of a casting is improved; the feeder head shell with the knock-off core 5 reduces the contact area of the feeder head shell and a mold, so that the feeder head shell is placed where feeding is needed, and the post-processing cost is reduced. The upper surface of the knock-off core 5 is provided with a buffer core 51 matched with the inner side of the riser shell, the cross section of the buffer core 51 is circular, and the upper surface of the buffer core 51 is of an arc structure; when the molten metal enters the inner cavity, part of the molten metal is in contact with the buffer core 51 and slowly falls along the arc-shaped structure on the surface of the buffer core 51, so that the pressure of the molten metal on the bottom of the inner cavity is reduced, and the use safety is improved.
The using method of the invention comprises the following steps: the riser shell is opposite to the position to be fed, in the casting pouring process, the molten metal continuously rises to be in contact with the first heating agent layer, and when the first heating agent layer burns and passes through the connecting hole to be in contact with the second heating agent layer, the second heating agent layer starts to burn. When the molten metal continuously rises and contacts the fusible layer, the fusible layer is melted, the covering agent is poured down to cover the surface of the molten metal, and the molten metal can contact the heating agent layer all the time in the continuous rising process.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the terms "a" or "an" and the like in the description and in the claims of this application do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
Exemplary embodiments of the present invention have been described in detail with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various changes and modifications may be made to the specific embodiments described above, and various combinations of the technical features and structures proposed by the present invention may be made without departing from the concept of the present invention.
Claims (9)
1. The utility model provides a high alloy steel foundry goods is with heat preservation riser cover that generates heat, includes the riser casing, the lower extreme of riser casing is provided with easily cuts the piece, the riser casing outside sets up to the protective layer, the inboard of protective layer is provided with heat preservation, its characterized in that: the heat insulation layer is characterized in that a heating agent layer and a covering agent layer are arranged on the inner side of the heat insulation layer, the heating agent layer comprises a first heating agent layer and a second heating agent layer, and the covering agent layer and the first heating agent layer are arranged up and down.
2. The exothermic and heat-insulating riser bush for high-alloy steel castings according to claim 1, characterized in that: and the upper surface of the knock-off core is provided with a buffer core matched with the inner side of the riser shell.
3. The exothermic and heat-insulating riser bush for high-alloy steel castings according to claim 2, characterized in that: the cross section of the buffer core is circular ring-shaped, and the upper surface of the buffer core is of an arc structure.
4. The exothermic and heat-insulating riser bush for high-alloy steel castings according to claim 1, characterized in that: the coverlay layer includes a fusible layer and a coverlay.
5. The exothermic and heat-insulating riser bush for high-alloy steel castings according to claim 4, characterized in that: and a connecting hole is arranged between the covering agent and the second heating agent layer.
6. The exothermic and heat-insulating riser bush for high-alloy steel castings according to claim 4, characterized in that: the easily-fusible layer is composed of carbon powder.
7. The exothermic and heat-insulating riser bush for high-alloy steel castings according to claim 4, characterized in that: the covering agent is one or more of plant ash, carbonized rice hulls, coke powder, flue ash, thermite, graphite slag or composite heating and heat-preserving covering agent.
8. The exothermic and heat-insulating riser bush for high-alloy steel castings according to claim 1, characterized in that: the heat-insulating layer is made of riser heat-insulating agent.
9. The exothermic and heat-insulating riser bush for high-alloy steel castings according to claim 1, characterized in that: and a connecting hole is arranged between the first heating agent layer and the second heating agent layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011181346.8A CN112059118A (en) | 2020-10-29 | 2020-10-29 | Heating and heat-insulating riser sleeve for high alloy steel casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011181346.8A CN112059118A (en) | 2020-10-29 | 2020-10-29 | Heating and heat-insulating riser sleeve for high alloy steel casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112059118A true CN112059118A (en) | 2020-12-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011181346.8A Pending CN112059118A (en) | 2020-10-29 | 2020-10-29 | Heating and heat-insulating riser sleeve for high alloy steel casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112059118A (en) |
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2020
- 2020-10-29 CN CN202011181346.8A patent/CN112059118A/en active Pending
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