CN113084078A - High ventilative heat preservation rising head - Google Patents
High ventilative heat preservation rising head Download PDFInfo
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- CN113084078A CN113084078A CN202110293762.5A CN202110293762A CN113084078A CN 113084078 A CN113084078 A CN 113084078A CN 202110293762 A CN202110293762 A CN 202110293762A CN 113084078 A CN113084078 A CN 113084078A
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- riser
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention provides a high-permeability heat-insulating riser which mainly comprises the following raw materials in percentage by weight: 30 to 40 percent of aluminum source; 18 to 30 percent of refractory aggregate; 20 to 30 percent of light heat-insulating material; 6 to 9 percent of fiber material; proper amount of adhesive, assistant and water. Through the mode, the problems of insufficient riser strength, insufficient air permeability and poor heat insulation of the conventional riser during pouring can be solved.
Description
Technical Field
The invention relates to the field of casting, in particular to a high-permeability heat-insulation riser.
Background
In the casting field, risers are attachments to be added above or to the side of the casting in order to avoid casting defects, and are one of the necessary attachments in the casting process. The riser mainly plays the roles of molten steel feeding and exhausting. Therefore, in order to meet the quality standard of the cast product, the feeder must have sufficient high air permeability and feeding effect.
The insulated feeder head is generally composed of an insulating material, a refractory aggregate, a binder and an auxiliary agent, and the finished product of the insulated feeder head is required to have the following properties: good heat preservation performance, good fire resistance, enough air permeability, enough dry strength, low price and convenient purchase.
For some small-sized steel castings, the placement of the insulating risers can be exposed to air, and the fire resistance and air permeability of the risers can directly influence the casting quality. The conventional insulating riser has the defects of burning crack and even steel running and the like because the shape of the riser cannot be maintained during pouring due to inappropriate refractoriness of the material. For some heat-insulating risers, due to insufficient air permeability, gas cannot be smoothly discharged in the pouring process, and the surface of a casting can have serious sand sticking defects.
The Chinese patent publication No. CN100333859C discloses a heat-insulating riser and a preparation method thereof, which are prepared from the following raw materials in percentage by weight: 860 kilograms of No. 6 quartz sand, 50-90 kilograms of aluminum silicate fiber cotton crushed aggregates, 30-60 kilograms of mineral cotton crushed aggregates, 30-60 kilograms of paper crushed aggregates and 30-90 kilograms of edible starch, the refractoriness can reach 1550oC, the heat-insulating property can reach that the solidification time of molten steel of the heat-insulating riser is not less than 2 times of that of the common riser of the sand mold with the same modulus, and the riser amplification factor is more than 1.3. Compared with the patent, the invention further improves the refractoriness and the heat preservation performance of the riser, solves the problems of insufficient toughness, easy cracking and insufficient heat preservation performance at high temperature, and meets the feeding requirement of castings.
Disclosure of Invention
In order to solve the problems, the invention provides a high-permeability heat-insulation riser which can solve the problems of insufficient riser strength, insufficient permeability and poor heat insulation of the conventional riser during pouring.
The main content of the invention comprises: a high-permeability heat-insulating riser mainly comprises the following raw materials in percentage by weight:
30 to 40 percent of aluminum source;
20 to 30 percent of light heat-insulating material;
18 to 30 percent of refractory aggregate;
6 to 9 percent of fiber material;
the balance of binder and water.
Preferably, the aluminum source is one or a mixture of more of aluminum powder, activated aluminum powder, aluminum slag and aluminum nitride, and the particle size is not higher than 80 meshes.
Preferably, the light heat-insulating material is one or a mixture of more of hollow floating beads, vermiculite, pumice, perlite, expanded perlite and vitrified micro bubbles, the particle size is not higher than 40 meshes, and the refractoriness of the mixture is not lower than 1250 ℃.
Preferably, the refractory aggregate is one or more of alumina, activated alumina, alumina-containing minerals, silica, magnesia-containing minerals, mullite and titanium concentrate, the particle size is not higher than 30 meshes, and the refractoriness of the mixture is not lower than 1550 ℃.
Preferably, the fiber material is one or more of asbestos, alumina silicate fiber, glass fiber, pulp and wood fiber.
Preferably, the binder is phenolic resin, and the addition amount of the binder is 5-15% of the total raw material weight.
Preferably, the detergent also comprises an auxiliary agent, wherein the auxiliary agent comprises a dispersing agent and a pH buffering agent.
Preferably, the dispersing agent is a substance capable of uniformly dispersing solid or liquid particles which are difficult to dissolve in liquid in a system, and the pH buffering agent is a solid or liquid substance capable of slowing down the change of the pH value of the system.
Preferably, the dispersing agent is one or more of citric acid, calcium stearate, ethylene-acrylic acid copolymer and HPMA, and the pH buffering agent is one or more of potassium dihydrogen phosphate, mixed phosphate and borax.
The riser is produced by adopting a conventional suction filtration method, all raw materials are mixed with water to form slurry with the solid content of 23-33%, the slurry is formed by suction filtration, and the slurry is dried for 2-3 hours at the temperature of 150-200 ℃.
The invention has the beneficial effects that: the heat insulation performance of the riser is controlled by matching different light heat insulation materials, so that the heat dissipation loss of the internal molten metal is reduced, and the solidification time of the molten metal is effectively prolonged; meanwhile, the combustion reaction of the aluminum source can enhance the self-sintering effect of the riser, the self refractoriness of the riser can be enhanced by the combustion product, and the strength of the riser at high temperature can be effectively enhanced by the cooperation of the combustion product and the fiber material; and the air permeability of the riser can be effectively enhanced by selecting and matching the materials of the components.
Detailed Description
The technical solution protected by the present invention is specifically explained below.
Example 1
The high-permeability heat-insulating riser is prepared by adding water accounting for 150% of the weight of the following components in percentage by weight, and performing compression molding and drying to prepare a test sample with the diameter of 50mm and the height of 50 mm.
Aluminum powder: 7, aluminum slag: 32 hollow floating beads: 22, alumina: 16, silica sand: 12 pulp: 6, phenolic resin: 5
The strength of the high-permeability heat-insulating riser sample is 4kg/cm2Air permeability of 170, density of 0.73g/cm3The riser amplification factor is 1.44, and the strength after combustion is high. The product result shows that the feed additive can play a good feeding role.
Example 2
The high-permeability heat-insulating riser is prepared by adding water accounting for 150% of the weight of the following components in percentage by weight, and performing compression molding and drying to prepare a test sample with the diameter of 50mm and the height of 50 mm.
Aluminum powder: 7, aluminum slag: 33 hollow floating bead: 22, alumina: 12 mullite: 8, paper pulp: 6, aluminum silicate fiber: 3, phenolic resin: 9
The strength of the high-permeability heat-insulating riser sample is 5kg/cm2Air permeability 138, density 0.71g/cm3The riser amplification factor is 1.43, and the post-combustion strength is high. The product result shows that the feed additive can play a good feeding role.
Example 3
The high-permeability heat-insulating riser is prepared by adding water accounting for 150% of the weight of the following components in percentage by weight, and performing compression molding and drying to prepare a test sample with the diameter of 50mm and the height of 50 mm.
Aluminum powder: 7, aluminum slag: 33 hollow floating bead: 20, pumice stone: 10, aluminum oxide: 10, mullite: 8, paper pulp: 6, phenolic resin: 6
The strength of the high-permeability heat-insulating riser sample is 3.4kg/cm2Air permeability 172, density 0.67g/cm3The riser amplification factor is 1.43, and the post-combustion strength is high. The product result shows that the feed additive can play a good feeding role.
Example 4
The high-permeability heat-insulating riser is prepared by adding water accounting for 150% of the weight of the following components in percentage by weight, and performing compression molding and drying to prepare a test sample with the diameter of 50mm and the height of 50 mm.
Aluminum powder: 6, aluminum slag: 24 hollow floating bead: 20, pumice stone: 10, aluminum oxide: 17, silica sand: 12 pulp: 6, phenolic resin: 5
The strength of the high-permeability heat-insulating riser sample is 3.2kg/cm2Air permeability of 191, density of 0.67g/cm3The riser amplification factor is 1.42, and the post-combustion strength is high. The product result shows that the feed additive can play a good feeding role.
Example 5
The high-permeability heat-insulating riser is prepared by adding water accounting for 150% of the weight of the following components in percentage by weight, and performing compression molding and drying to prepare a test sample with the diameter of 50mm and the height of 50 mm.
Aluminum powder: 5, aluminum slag: 25 hollow floating bead: 20, pumice stone: 10, aluminum oxide: 12 mullite: 6, pulp: 6, aluminum silicate fiber: 3, phenolic resin: 13
The strength of the high-permeability heat-insulating riser sample is 5.8kg/cm2Air permeability of 147, density of 0.70g/cm3The riser amplification factor is 1.41, and the post-combustion strength is high. The product result shows that the feed additive can play a good feeding role.
Example 6
The high-permeability heat-insulating riser is prepared by adding water accounting for 150% of the weight of the following components in percentage by weight, and performing compression molding and drying to prepare a test sample with the diameter of 50mm and the height of 50 mm.
Aluminum powder: 5, aluminum slag: 25 hollow floating bead: 21, alumina: 17, silica sand: 13 pulp: 6, aluminum silicate fiber: 3, phenolic resin: 10
The strength of the high-permeability heat-insulating riser sample is 4.9kg/cm2Air permeability 161, density 0.73g/cm3The riser amplification factor is 1.42, and the post-combustion strength is high. The product result shows that the feed additive can play a good feeding role.
Comparative example 1
The modification of the above example 1 was carried out without using an aluminum source, and the composition ratios were as follows,
hollow floating beads: 30 parts of alumina: 34, silica sand: 25 pulp: 6, phenolic resin: 5
The test sample with the diameter of 50mm and the height of 50mm is prepared by adding water accounting for 150 percent of the weight of the components in percentage by weight, pressing, forming and drying. The small sample of the high-permeability heat-insulating riser obviously lacks a self-sintering effect, and molten steel leakage can be caused due to lack of thermal strength in actual use, so that the method for improving the thermal strength of the riser by adopting an aluminum source is an essential element of the invention.
Comparative example 2
The embodiment 1 is modified, the hollow floating beads are replaced by vermiculite, the component ratio is as follows,
aluminum powder: 7, aluminum slag: 32 vermiculite: 22, alumina: 16, silica sand: 12 pulp: 6, phenolic resin: 5
The test sample with the diameter of 50mm and the height of 50mm is prepared by adding water accounting for 150 percent of the weight of the components in percentage by weight, pressing, forming and drying. The small sample of the high-permeability heat-insulating riser has obviously insufficient refractoriness, and molten steel can leak out due to the fact that the high-permeability heat-insulating riser is burnt and collapsed in use, so that the adoption of a light refractory material with sufficient refractoriness is an essential element of the invention.
Comparative example 3
The above examples 1, 2 and 6 were modified to adjust the aluminum source content to 16%, and the recipe was redesigned. The density of the prepared small sample of the high-permeability heat-insulation riser is 0.81g/cm3、0.78g/cm3、0.80g/cm3The amplification factors are 1.38, 1.37 and 1.38 respectively. Because the content of the light heat-insulating material is lower, the density and the heat conductivity of the riser are higher, the heat-insulating property is insufficient, and a good feeding effect cannot be achieved. Therefore, the content of the light heat-insulating material is determined to be 20-30%.
Product effect comparison table
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. The high-permeability heat-insulation riser is characterized by mainly comprising the following raw materials in percentage by weight:
30 to 40 percent of aluminum source;
20 to 30 percent of light heat-insulating material;
18 to 30 percent of refractory aggregate;
6 to 9 percent of fiber material;
a binder and water.
2. The high-permeability heat-insulating riser as claimed in claim 1, wherein the aluminum source is one or more of aluminum powder, active aluminum powder, aluminum slag and aluminum nitride, and the particle size is not higher than 80 meshes.
3. The high-permeability insulating riser as claimed in claim 1, wherein the light insulating material is one or more of hollow floating beads, vermiculite, pumice, perlite, expanded perlite and vitrified micro bubbles, the particle size is not higher than 40 meshes, and the refractoriness of the mixture is not lower than 1250 ℃.
4. The high-permeability heat-insulating riser as claimed in claim 1, wherein the refractory aggregate is one or more of alumina, activated alumina, alumina-containing minerals, silica, magnesia-containing minerals, mullite and ilmenite concentrate, the particle size is not higher than 30 meshes, and the refractoriness of the mixture is not lower than 1550 ℃.
5. The high permeability insulating riser as claimed in claim 1, wherein the fibrous material is a mixture of one or more of asbestos, alumina silicate fiber, glass fiber, pulp, and wood fiber.
6. The high-permeability insulating riser as claimed in claim 1, wherein the binder is phenolic resin and is added in an amount of 5-15% by weight of the total raw materials.
7. The highly permeable insulated riser according to claim 1, further comprising an auxiliary agent, wherein the auxiliary agent comprises a dispersing agent and a pH buffering agent.
8. The highly-breathable insulated feeder according to claim 7, wherein the dispersing agent is a substance capable of uniformly dispersing solid or liquid particles which are difficult to dissolve in liquid in the system, and the pH buffering agent is a solid or liquid substance capable of slowing down the change of pH value of the system.
9. The high-permeability insulating riser as claimed in claim 8, wherein the dispersant is one or more of citric acid, calcium stearate, ethylene-acrylic acid copolymer and HPMA, and the pH buffer is one or more of potassium dihydrogen phosphate, mixed phosphate and borax.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110293762.5A CN113084078A (en) | 2021-03-19 | 2021-03-19 | High ventilative heat preservation rising head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110293762.5A CN113084078A (en) | 2021-03-19 | 2021-03-19 | High ventilative heat preservation rising head |
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| CN113084078A true CN113084078A (en) | 2021-07-09 |
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| CN202110293762.5A Pending CN113084078A (en) | 2021-03-19 | 2021-03-19 | High ventilative heat preservation rising head |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101433944A (en) * | 2008-12-19 | 2009-05-20 | 洛阳双瑞特种装备有限公司 | High-efficient exothermic riser sleeve for casting |
| CN103962509A (en) * | 2014-05-03 | 2014-08-06 | 焦作鸽德新材料有限公司 | Exothermic insulating riser material and preparation method thereof |
| CN104308085A (en) * | 2014-11-19 | 2015-01-28 | 攀枝花学院 | Heating and insulating riser bush |
| CN106180570A (en) * | 2016-08-15 | 2016-12-07 | 攀枝花学院 | A kind of compound and its riser buss made and the preparation method of riser buss |
| CN106807898A (en) * | 2017-01-18 | 2017-06-09 | 苏州兴业材料科技股份有限公司 | Highly-breathable heat preservation rising head and preparation method thereof |
| TWI610736B (en) * | 2016-12-12 | 2018-01-11 | 皇廣鑄造發展股份有限公司 | Highly exothermic feeder sleeves and manufacturing method thereof |
| CN108044041A (en) * | 2018-01-25 | 2018-05-18 | 大连交通大学 | Resource reutilization type heat preservation riser buss, raw briquetting, the hot insulating riser sleeve of spontaneous pressure and preparation method thereof |
-
2021
- 2021-03-19 CN CN202110293762.5A patent/CN113084078A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101433944A (en) * | 2008-12-19 | 2009-05-20 | 洛阳双瑞特种装备有限公司 | High-efficient exothermic riser sleeve for casting |
| CN103962509A (en) * | 2014-05-03 | 2014-08-06 | 焦作鸽德新材料有限公司 | Exothermic insulating riser material and preparation method thereof |
| CN104308085A (en) * | 2014-11-19 | 2015-01-28 | 攀枝花学院 | Heating and insulating riser bush |
| CN106180570A (en) * | 2016-08-15 | 2016-12-07 | 攀枝花学院 | A kind of compound and its riser buss made and the preparation method of riser buss |
| TWI610736B (en) * | 2016-12-12 | 2018-01-11 | 皇廣鑄造發展股份有限公司 | Highly exothermic feeder sleeves and manufacturing method thereof |
| CN106807898A (en) * | 2017-01-18 | 2017-06-09 | 苏州兴业材料科技股份有限公司 | Highly-breathable heat preservation rising head and preparation method thereof |
| CN108044041A (en) * | 2018-01-25 | 2018-05-18 | 大连交通大学 | Resource reutilization type heat preservation riser buss, raw briquetting, the hot insulating riser sleeve of spontaneous pressure and preparation method thereof |
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