阅读说明：本技术 一种耐高温铝合金炉头的制备方法 (Preparation method of high-temperature-resistant aluminum alloy furnace end ) 是由 沈敏 于 2019-04-03 设计创作，主要内容包括：本发明涉及一种耐高温铝合金炉头的制备方法,具体生产步骤为：将65-70wt％铝合金(A356)熔炼,精练,清渣,并加入1.1-1.3wt％的Al-Sr5,0.9-1.2wt％的Mn,8-10.8wt％的Si,0.15-0.2wt％的Ti及6-6.8wt％的变质剂,改善金属熔液的性能,再通过合型,压铸制备而成。本发明方法生产的一种耐高温铝合金炉头,具有较高的耐热性能,可以在600℃高温下长期燃烧不变形。(The invention relates to a preparation method of a high-temperature-resistant aluminum alloy furnace end, which comprises the following specific production steps: the alloy is prepared by smelting 65-70 wt% of aluminum alloy (A356), refining, removing slag, adding 1.1-1.3 wt% of Al-Sr5, 0.9-1.2 wt% of Mn, 8-10.8 wt% of Si, 0.15-0.2 wt% of Ti and 6-6.8 wt% of alterant, improving the performance of molten metal, and then performing mold closing and die casting. The high-temperature-resistant aluminum alloy furnace end produced by the method has high heat resistance, and can be burnt for a long time at the high temperature of 600 ℃ without deformation.)

1. the preparation method of the high-temperature-resistant aluminum alloy furnace end is characterized by comprising the following steps of:

(1) smelting: preheating a smelting furnace to 200 ℃, maintaining for 0.5-1 h, then adding 65-70 wt% of aluminum alloy A356, raising the temperature of the smelting furnace to 670-;

(2) refining: adding 5-7 wt% of scouring agent into the molten aluminum alloy metal in the step 1 to remove hydrogen and floating oxidation slag inclusion in the molten aluminum alloy metal;

(3) slag removal: 5-7 wt% of slag removing agent and 3-6 wt% of heating agent are scattered on the surface of the aluminum alloy molten metal in the step 2, the temperature of the molten metal is kept, and a funnel device or a degasser is used for removing oxidation slag, mainly oxides of silicon;

(4) modification: adding 1.1-1.3 wt% of Al-Sr5, 0.9-1.2 wt% of Mn, 8-10.8 wt% of Si, 0.15-0.2 wt% of Ti and 6-6.8 wt% of modifier into the molten aluminum alloy in the step 3, and then fully stirring the molten aluminum alloy at the temperature of 670-;

(5) preparing a mould: preheating a furnace end mould to 350-400 ℃, spraying clear water on the inner surface of a furnace end mould cavity, waiting for 5 minutes, spraying 34# coating on the surface of the furnace end mould cavity, and then spraying 39# coating on the surface of the mould cavity;

(6) and (3) mold assembling: placing the sand core into the furnace end mold cavity prepared in the step 5 for mold assembling, and adjusting the temperature of the mold to 400 ℃;

(7) die casting: pouring a certain amount of the aluminum alloy molten metal at 670-700 ℃ prepared in the step 4 into the die cavity in the step 6, quickly closing the die, and pressurizing to 50-100kPa when the punch head is close to the molten metal;

(8) cooling, demolding and taking out the workpiece;

(9) surface treatment: and (3) polishing the surface of the workpiece by using corundum (80#) under the air pressure of 50-100kPa to prevent the oxidation reaction of aluminum and air.

2. The preparation method of the high-temperature-resistant aluminum alloy furnace end according to claim 1, characterized in that: in the step 4, 1.15 wt% of Al-Sr5, 0.95 wt% of Mn, 10 wt% of Si, 0.15 wt% of Ti and 6.5 wt% of alterant are added, and the temperature is maintained at 700 ℃.

3. The preparation method of the high-temperature-resistant aluminum alloy furnace end according to claim 1, characterized in that: and 7, pouring a certain amount of the molten aluminum alloy metal at 700 ℃ prepared in the step 4 into the die cavity in the step 6, quickly closing the die, and pressurizing to 80kPa when the punch head is close to the molten aluminum alloy metal.

Technical Field

The invention relates to a preparation method of an aluminum alloy furnace end, in particular to a preparation method of a high-temperature-resistant aluminum alloy furnace end.

Background

The traditional stove mostly uses cast iron and copper materials, the furnace end of the cast iron is easy to rust and difficult to maintain in the using process, the cost of the copper material is high, and the processing difficulty is high; as a new furnace, the aluminum alloy furnace is more and more favored by the market due to low cost, easy processing and stainless corrosion, but the existing aluminum alloy furnace has lower melting point and is easy to deform after being used at high temperature for a long time.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention aims to provide a preparation method of a high-temperature-resistant aluminum alloy furnace end.

In order to solve the above technical problems and achieve the above object, the present invention provides the following technical solutions: a preparation method of a high-temperature-resistant aluminum alloy furnace end comprises the following steps:

(1) smelting: preheating a smelting furnace to 200 ℃, maintaining for 0.5-1 h, then adding 65-70 wt% of aluminum alloy A356, raising the temperature of the smelting furnace to 670-;

(2) refining: adding 5-7 wt% of scouring agent into the molten aluminum alloy metal in the step 1 to remove hydrogen and floating oxidation slag inclusion in the molten aluminum alloy metal;

(3) slag removal: 5-7 wt% of slag removing agent and 3-6 wt% of heating agent are scattered on the surface of the aluminum alloy molten metal in the step 2, the temperature of the molten metal is kept, and a funnel device or a degasser is used for removing oxidation slag, mainly oxides of silicon;

(4) modification: adding 1.1-1.3 wt% of Al-Sr5, 0.9-1.2 wt% of Mn, 8-10.8 wt% of Si, 0.15-0.2 wt% of Ti and 6-6.8 wt% of modifier into the aluminum alloy molten metal in the step 3, and then fully stirring the molten metal at the temperature of 670-;

(5) preparing a mould: preheating a furnace end mould to 350-400 ℃, spraying clear water on the inner surface of a furnace end mould cavity, waiting for 5 minutes, spraying 34# coating on the surface of the furnace end mould cavity, and then spraying 39# coating on the surface of the mould cavity;

(6) and (3) mold assembling: placing the sand core into the furnace end mold cavity prepared in the step 5 for mold assembling, and adjusting the temperature of the mold to 400 ℃;

(7) die casting: pouring a certain amount of the aluminum alloy molten metal at 670-700 ℃ prepared in the step 4 into the die cavity in the step 6, quickly closing the die, and pressurizing to 50-100kPa when the punch head is close to the molten metal;

(8) cooling, demolding and taking out the workpiece;

(9) surface treatment: and (3) polishing the surface of the workpiece by using corundum (80#) under the air pressure of 50-100kPa to prevent the oxidation reaction of aluminum and air.

Among them, in step 4, it is preferable to add 1.15 wt% of Al-Sr5, 0.95 wt% of Mn, 10 wt% of Si, 0.15 wt% of Ti and 6.5 wt% of a modifier, and maintain the temperature at 700 ℃.

Preferably, in the step 7, a certain amount of the aluminum alloy molten metal at 700 ℃ prepared in the step 4 is poured into the die cavity in the step 6, the die is rapidly closed, and when the punch head approaches the molten metal, the pressure is increased to 80 kPa.

Compared with the prior art, the invention has the following beneficial effects: the aluminum alloy furnace end cast by the aluminum alloy molten metal can be burnt for a long time at the high temperature of 600 ℃ without deformation, and the heat resistance of the aluminum alloy furnace end is improved.

Detailed Description

The technical solution of the present invention will be further specifically described below by way of examples.

A preparation method of a high-temperature-resistant aluminum alloy furnace end comprises the following specific materials: 65-70 wt% of aluminum alloy (A356), 5-7 wt% of scouring agent, 5-7 wt% of slag-removing agent, 3-6 wt% of heating agent, 1.1-1.3 wt% of aluminum-strontium alloy (Al-Sr5), 0.9-1.2 wt% of manganese (Mn), 8-10.8 wt% of silicon (Si), 0.15-0.2 wt% of titanium (Ti) and 6-6.8 wt% of modifier, wherein the modifier is a mixture of 2/3NaF and 1/3 NaCl. The method comprises the following steps: (1) smelting: preheating a smelting furnace to 200 ℃, maintaining for 0.5-1 h, then adding 65-70 wt% of aluminum alloy A356, raising the temperature of the smelting furnace to 670-; (2) refining: adding 5-7 wt% of scouring agent into the molten aluminum alloy metal in the step 1 to remove hydrogen and floating oxidation slag inclusion in the molten aluminum alloy metal; (3) slag removal: 5-7 wt% of slag removing agent and 3-6 wt% of heating agent are scattered on the surface of the aluminum alloy molten metal in the step 2, the temperature of the molten metal is kept, and a funnel device or a degasser is used for removing oxidation slag, mainly oxides of silicon; (4) adding 1.1-1.3 wt% of Al-Sr5, 0.9-1.2 wt% of Mn, 8-10.8 wt% of Si, 0.15-0.2 wt% of Ti and 6-6.8 wt% of modifier into the molten aluminum alloy in the step 3, and then fully stirring the molten aluminum alloy at the temperature of 670-; (5) preparing a mould: preheating a furnace end mould to 350-; (6) and (3) mold assembling: placing the sand core into the furnace end mold cavity prepared in the step 5 for mold assembling, and adjusting the temperature of the mold to 400 ℃; (7) die casting: pouring a certain amount of the aluminum alloy molten metal at 670-700 ℃ prepared in the step 4 into the die cavity in the step 6, quickly closing the die, and pressurizing to 50-100kPa when the punch head is close to the molten metal; (8) cooling, demolding and taking out the workpiece; (9) surface treatment: and (3) polishing the surface of the workpiece by using corundum (80#) under the air pressure of 50-100kPa to prevent the oxidation reaction of aluminum and air.

Wherein, in the step 4, the preferable scheme is that 1.15 wt% of Al-Sr5, 0.95 wt% of Mn, 10 wt% of Si, 0.15 wt% of Ti and 6.5 wt% of alterant are added, and the temperature is maintained at 700 ℃.

In the step 7, a certain amount of the aluminum alloy molten metal at 700 ℃ prepared in the step 4 is poured into the die cavity in the step 6, the die is rapidly closed, and when the punch head approaches the molten metal, the pressure is increased to 80 kPa.

Compared with the prior art, the invention has the following beneficial effects: the heat resistance of the molten metal is improved by further treating the molten metal and adding elements such as Al-Sr5, Mn, Si, Ti and the like, so that the aluminum alloy furnace end cast by the molten metal can be burnt for a long time at the high temperature of 600 ℃ without deformation, and the heat resistance of the aluminum alloy furnace end is improved.

The experimental conditions of the invention are as follows: the laboratory environment: temperature (23 + -2) DEG C; humidity (50 ± 5)% RH; experimental equipment: DSC200F3 and salt spray test chamber.

The product produced by the invention and the traditional aluminum alloy furnace end product are subjected to entity sampling test: