A kind of heating and heat-insulating riser specially used for V-method casting of manganese steel frog and its preparation method

Abstract

The invention discloses a heating and heat-insulating riser specially used for V-method casting of manganese steel frog and a preparation method thereof. The components thereof include, by weight: 240-260 kg of insulation material, wherein the insulation material includes floating beads, micro beads and perlite; 20-30 kg of binder component, wherein the binder component includes phenolic resin, water glass and urea-formaldehyde glue; and 148-168 kg of other materials, wherein the other materials include alumina, sodium fluoroaluminate, aluminum sulfate, aluminum chips, black iron oxide, newspaper and defoamer. The invention has the following beneficial effects: the invention adopts raw materials such as perlite, floating beads and micro beads with high refractoriness and extremely low micropowder content, which greatly replaces the amount of aluminum slag and sodium fluoroaluminate, and the performance of the produced heating and heat-insulating riser product is greatly improved; the invention adopts other raw materials without micropowder, which greatly replaces phenolic resin, aluminum slag and sodium fluoroaluminate, and at the same time, adopts inorganic binder to partially replace organic binders such as phenolic resin and urea-formaldehyde resin, so that the gas emission is lower.

Description

Technical Field

[0001] The invention belongs to the technical field of heat-insulating risers, and in particular relates to a heat-insulating riser specially used for V-method casting of manganese steel frogs and a preparation method thereof. Background Art

[0002] In the casting production of manganese steel frogs, insufficient pouring at the toe end and air holes are extremely common casting defects; the main reason for the above defects is that during the pouring process, due to the high temperature of the liquid metal, a large amount of gas is generated in the mold cavity, which cannot be discharged, causing the mold cavity air pressure to be too high, which not only hinders the flow of liquid metal and makes it impossible to fully fill the mold, thereby causing the defect of insufficient pouring at the toe end, but also, the excessive air pressure will press the gas into the surface of the unsolidified liquid metal, causing invasive air hole defects.

[0003] The most direct way to solve the above problems is to reduce the amount of gas generated in the sand mold cavity at high temperature; the exothermic and thermal insulation riser is an important component of the manganese steel frog casting sand mold, and is used in large quantities. The main shortcoming of the exothermic and thermal insulation riser products currently on the market is the large amount of gas generation, which aggravates the above casting defects.

[0004] Patent publication number CN103962509B is a kind of heating and heat-insulating riser material and its preparation method. The patent discloses that it is composed of aggregate, heating material, heat-insulating material, binder and combustion aid, wherein the mass percentage of the aggregate is 30-45%, the mass percentage of the heating material is 10-35%, the mass percentage of the heat-insulating material is 25-45%, the mass percentage of the binder is 3.5-15%, and the mass percentage of the combustion aid is 1.5-3%; the preparation process steps are as follows: weigh 30-45% of magnesium powder, 40-55% of potassium perchlorate, 5-15% of cross-linked polyvinylpyrrolidone or phenolic resin or egg white solution according to mass percentage, fill After being stirred evenly, particles with a diameter not exceeding 2 mm are made and then dried at low temperature; 30-45% of aggregate, 10-35% of heating material, 25-45% of insulation material, 3.5-15% of binder and 1.5-3% of combustion aid are weighed by mass percentage, and mixed for 10-25 minutes to obtain slurry; a sandblasting machine is used to fill the mixed slurry into a riser mold for molding and demolding, and the riser wall thickness is 8-15 mm; the riser material after demolding is put into a continuous drying kiln, and is dried at a speed of 0.5 cm / s at 180-200°C for 30 minutes to solidify, and the edges and corners of the riser are cleaned after drying to complete the preparation of the casting heating and insulation riser material.

[0005] The mainstream heating and thermal insulation risers on the current market use a large amount of aluminum slag and sodium fluoroaluminate in the production process. The amount of the two even reaches more than 40% of the total raw materials. The typical characteristics of these two materials are high micropowder content and low refractoriness, which greatly reduces the refractoriness, air permeability, heating capacity and thermal insulation performance of the heating and thermal insulation riser products.

[0006] The mainstream binders used in the heating and insulation risers on the current market are organic binders such as phenolic resin and urea-formaldehyde resin. At the same time, the aluminum slag and sodium fluoroaluminate contain a large amount of micropowder with extremely small particle size and high surface energy, which will also absorb a large amount of gas. During the pouring process, the high-temperature heat of the liquid metal will decompose the phenolic resin. At the same time, the gas adsorbed by the micropowder will also be released, which will produce a large amount of gas, resulting in a large amount of gas emission. Summary of the invention

[0007] The purpose of the present invention is to provide a heating and heat-insulating riser specially used for V-method casting of manganese steel frog and a preparation method thereof, wherein an inorganic binder is used to partially replace organic binders such as phenolic resin and urea-formaldehyde resin, so as to reduce the gas generated by thermal decomposition during the pouring process, thereby reducing the gas emission of the heating and heat-insulating riser; at the same time, raw materials such as perlite, floating beads, microbeads, etc. with high refractoriness and no micropowder are used to largely replace the amount of aluminum slag and sodium fluoroaluminate, reduce gas adsorption, further reduce the gas emission, and finally completely solve the casting defects such as insufficient pouring and air holes at the toe end of the manganese steel frog.

[0008] To achieve the above object, the present invention provides the following technical solution: a heating and heat-insulating riser specially used for V-method casting of manganese steel frog, the components of which include by weight:

[0009] 240-260kg of thermal insulation material, including floating beads, micro beads, and perlite;

[0010] 20-30 kg of adhesive component, which includes phenolic resin, water glass and urea-formaldehyde glue;

[0011] 148-168kg of other materials, including alumina, sodium fluoroaluminate, aluminum sulfate, aluminum chips, black iron oxide, newspaper, and defoaming agent.

[0012] As a preferred technical solution of the present invention, in the thermal insulation material, the mass ratio of the floating beads, micro beads and perlite is 1:3:1.

[0013] As a preferred technical solution of the present invention, the mass ratio of the phenolic resin, water glass and urea-formaldehyde glue is 1:1:0.5.

[0014] As a preferred technical solution of the present invention, the mass ratio of the sodium fluoroaluminate to black iron oxide is 1:3.

[0015] As a preferred technical solution of the present invention, the mass ratio of the aluminum sulfate to the defoaming agent is 2:1.

[0016] The present invention also discloses a method for preparing a heating and heat-insulating riser specially used for V-method casting of manganese steel frog, comprising the following steps:

[0017] Weigh 240-260kg of insulation material by weight;

[0018] Weigh 20-30 kg of the binder component by weight;

[0019] Weigh 148-168kg of other materials by weight;

[0020] The weighed raw materials are mixed evenly to form a mixture;

[0021] Fill the mixture into the riser mold, and perform molding and demoulding;

[0022] The demoulded riser material is placed in a continuous drying kiln for drying and solidification to obtain a heat-generating and heat-insulating riser.

[0023] As a preferred technical solution of the present invention, drying is carried out at 180-200° C. for 20-40 minutes.

[0024] As a preferred technical solution of the present invention, the conveying speed of the drying kiln is 0.5 cm / s.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention adopts raw materials such as perlite, floating beads, micro beads, etc. with high refractoriness and extremely low micropowder content, which largely replaces the amount of aluminum slag and sodium fluoroaluminate, and the performance of the produced heat-generating and heat-insulating riser products is greatly improved;

[0027] The present invention adopts other raw materials without micro powder, which largely replace phenolic resin, aluminum slag, and sodium fluoroaluminate. At the same time, inorganic binders are adopted to partially replace organic binders such as phenolic resin and urea-formaldehyde resin, so the gas generation amount is lower.

[0028] The heat-generating and heat-insulating riser of the present invention has been widely used in the V-method casting production of manganese steel frogs, verifying the above advantages of the product of the present invention and solving the casting defects of the manganese steel frogs such as insufficient pouring at the toe end and air holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a flow chart for preparing a heating and heat-insulating riser specially used for V-method casting of a manganese steel frog. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figure 1 , which is the first embodiment of the present invention, provides a heating and heat-insulating riser specially used for V-method casting of manganese steel frog, and its components by weight include:

[0033] 240kg of insulation materials, including 48kg of floating beads, 144kg of micro beads, and 48kg of perlite;

[0034] 20kg of adhesive component, including 8kg of phenolic resin, 8kg of water glass, and 4kg of urea-formaldehyde glue; 148kg of other materials, including 35kg of alumina, 8kg of sodium fluoroaluminate, 2kg of aluminum sulfate, 58kg of aluminum chips, 24kg of black iron oxide, 20kg of newspaper, and 1kg of defoaming agent.

[0035] In this embodiment, preferably, in the thermal insulation material, the mass ratio of the floating beads, micro beads and perlite is 1:3:1.

[0036] In this embodiment, preferably, the mass ratio of phenolic resin, water glass and urea-formaldehyde glue is 1:1:0.5.

[0037] In this embodiment, preferably, the mass ratio of sodium fluoroaluminate to black iron oxide is 1:3.

[0038] In this embodiment, preferably, the mass ratio of aluminum sulfate to defoaming agent is 2:1.

[0039] A method for preparing a heating and heat-insulating riser specially used for V-method casting of manganese steel frogs comprises the following steps:

[0040] Weigh 240kg of insulation material by weight;

[0041] Weigh 20 kg of the binder component by weight;

[0042] Weigh 148kg of other materials by weight;

[0043] The weighed raw materials are mixed evenly to form a mixture;

[0044] Fill the mixture into the riser mold, and perform molding and demoulding;

[0045] The demoulding riser material is placed in a continuous drying kiln with a conveying speed of 0.5 cm / s. The material is dried at 180°C for 40 minutes, and a heat-generating and heat-insulating riser is obtained after curing.

[0046] The current heating and thermal insulation risers have low refractoriness, poor air permeability and poor thermal insulation performance. The fundamental reason is that a large amount of aluminum slag with extremely high micropowder content is used in its raw materials. The present invention uses floating beads, microbeads and perlite that do not contain micropowder to completely replace the aluminum slag, which completely solves the above defects.

[0047] In order to reduce the gas generated by thermal decomposition during the pouring process, the present invention adopts inorganic binders to partially replace organic binders such as phenolic resin and urea-formaldehyde resin, thereby greatly reducing the gas emission of the heating and heat-insulating riser.

[0048]

[0049] Example 2

[0050] See also Figure 1 , which is the second embodiment of the present invention, is based on the previous embodiment, except that:

[0051] A heating and heat-insulating riser specially used for V-method casting of manganese steel frog, the components of which are measured by weight:

[0052] 250kg of thermal insulation materials, including 50kg of floating beads, 150kg of micro beads, and 50kg of perlite;

[0053] 25kg of adhesive component, including 10kg of phenolic resin, 10kg of water glass and 5kg of urea-formaldehyde glue;

[0054] 158kg of other materials, including 35kg of alumina, 10kg of sodium fluoroaluminate, 2kg of aluminum sulfate, 60kg of aluminum chips, 30kg of black iron oxide, 20kg of newspaper, and 1kg of defoaming agent.

[0055] A method for preparing a heating and heat-insulating riser specially used for V-method casting of manganese steel frogs comprises the following steps:

[0056] Weigh 250kg of insulation material by weight;

[0057] Weigh 25 kg of the binder component by weight;

[0058] Weigh 158kg of other materials by weight;

[0059] The demoulding riser material is placed in a continuous drying kiln with a conveying speed of 0.5 cm / s. The material is dried at 190°C for 30 minutes, and a heat-generating and heat-insulating riser is obtained after curing.

[0060]

[0061] Example 3

[0062] See also Figure 1 , which is the third embodiment of the present invention, is based on the previous embodiment, except that:

[0063] A heating and heat-insulating riser specially used for V-method casting of manganese steel frog, the components of which are measured by weight:

[0064] 260kg of insulation materials, including 52kg of floating beads, 156kg of micro beads, and 52kg of perlite;

[0065] 30kg of adhesive component, including 12kg of phenolic resin, 12kg of water glass and 6kg of urea-formaldehyde glue;

[0066] 168kg of other materials, including 35kg of alumina, 12kg of sodium fluoroaluminate, 2kg of aluminum sulfate, 62kg of aluminum chips, 36kg of black iron oxide, 20kg of newspaper, and 1kg of defoaming agent.

[0067] A method for preparing a heating and heat-insulating riser specially used for V-method casting of manganese steel frogs comprises the following steps:

[0068] Weigh 260kg of insulation material by weight;

[0069] Weigh 30 kg of the binder component by weight;

[0070] Weigh 168kg of other materials by weight;

[0071] The riser material after demoulding is placed in a continuous drying kiln with a conveying speed of 0.5 cm / s. It is dried at 200° C. for 20 minutes, and a heat-generating and heat-insulating riser is obtained after curing.

[0072]

[0073] Although the embodiments of the present invention have been shown and described, as detailed above, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heating and heat-insulating riser specially used for V-method casting of manganese steel frog, characterized in that: Its components by weight include: 240-260kg of thermal insulation material, including floating beads, micro beads, and perlite; 20-30 kg of adhesive component, which includes phenolic resin, water glass and urea-formaldehyde glue; 148-168kg of other materials, including alumina, sodium fluoroaluminate, aluminum sulfate, aluminum chips, black iron oxide, newspaper, and defoaming agent.

2. The heating and heat-insulating riser specially used for V-method casting of manganese steel frog according to claim 1, characterized in that: In the thermal insulation material, the mass ratio of the floating beads, micro beads and perlite is 1:3:

1.

3. The heating and heat-insulating riser specially used for V-method casting of manganese steel frog according to claim 1, characterized in that: The mass ratio of the phenolic resin, water glass and urea-formaldehyde glue is 1:1:0.

5.

4. The heating and heat-insulating riser specially used for V-method casting of manganese steel frog according to claim 1, characterized in that: The mass ratio of the sodium fluoroaluminate to black iron oxide is 1:

3.

5. The exothermic and heat-insulating riser specially used for V-method casting of manganese steel frog according to claim 1, characterized in that: The mass ratio of the aluminum sulfate to the defoaming agent is 2:

1.

6. The method for preparing a heating and heat-insulating riser for V-method casting of manganese steel frog according to any one of claims 1 to 5, characterized in that: The steps include: Weigh 240-260kg of insulation material by weight; Weigh 20-30 kg of the binder component by weight; Weigh 148-168kg of other materials by weight; The weighed raw materials are mixed evenly to form a mixture; Fill the mixture into the riser mold, and perform molding and demoulding; The demoulded riser material is placed in a continuous drying kiln for drying and solidification to obtain a heat-generating and heat-insulating riser.

7. The method for preparing a heating and heat-insulating riser specially used for V-method casting of manganese steel frog according to claim 6, characterized in that: Dry at 180-200℃ for 20-40min.

8. The method for preparing a heating and heat-insulating riser specially used for V-method casting of manganese steel frog according to claim 6, characterized in that: The conveying speed of the drying kiln is 0.5 cm / s.

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