CN102398008A - Method for preparing aluminum alloy composite round ingot blank - Google Patents

Abstract

The invention provides a method for preparing an aluminum alloy composite round billet. First, the outer aluminum alloy is melted and refined, and the cylindrical core aluminum alloy billet is preheated to room temperature to 600°C in a heat treatment furnace, and kept warm; The preheated cylindrical core material aluminum alloy billet passes through the crystallizer and is placed on the base of the dummy ingot equipment, and centered; the aluminum liquid at 700~780°C enters the crystallizer evenly through the preheated launder and splitter plate Inside, the cylindrical core aluminum alloy billet in the crystallizer is completely covered; semi-continuous casting starts when the aluminum liquid in the crystallization area solidifies, and finally the aluminum alloy composite round billet is prepared. The process is simple, and the thickness of the outer layer aluminum alloy of the prepared aluminum alloy composite round ingot is evenly distributed, and it is closely combined with the inner layer alloy without gaps. There is no need to modify the existing casting equipment, which can reduce the process caused by mechanical assembly and overcome the internal and external problems. The problem of gas residue between layers can effectively improve production efficiency and reduce production costs.

Description

Preparation method of aluminum alloy composite round billet

technical field

The invention relates to a method for preparing an aluminum alloy composite round billet, belonging to the technical field of aluminum alloy processing.

Background technique

At present, the composite ingots used to manufacture aluminum alloy composite pipes are generally prepared by mechanical assembly, that is, the outer aluminum alloy tube billet and the core aluminum alloy billet are prepared respectively, and then the core material alloy rod is put into the outer layer alloy tube. , Fix the outer layer alloy tube billet and the core material alloy rod together by thermal expansion method or other methods. This method has many processing steps and high cost, and there must be gaps when the inner and outer aluminum alloys are assembled, and the residual air in the gaps will affect the subsequent extrusion and drawing quality of the composite ingot. Moreover, the length of the machining assembly billet is limited by the machining equipment, and the production efficiency is low.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the prior art, provide a method for preparing an aluminum alloy composite round ingot, and overcome the problems of residual gas between the inner and outer layer alloys and the limitation of the length of the ingot.

The purpose of the present invention is achieved through the following technical solutions:

The method for preparing an aluminum alloy composite round billet is characterized in that: the outer layer of aluminum alloy liquid is coated on the cylindrical core material aluminum alloy billet, and the composite round billet is prepared by semi-continuous casting; it includes the following process steps:

1) Melt and refine the outer aluminum alloy, and preheat the cylindrical core aluminum alloy billet in a heat treatment furnace to room temperature ~ 600 ° C, and keep it warm;

2) Take out the preheated cylindrical core aluminum alloy billet and put it on the base of the dummy ingot equipment through the crystallizer, and center it; pass the aluminum liquid at 700~780°C through the preheated launder and splitter plate evenly Enter the crystallizer and completely cover the cylindrical core material aluminum alloy billet in the crystallizer;

3) Start semi-continuous casting when the molten aluminum in the crystallization zone is solidified, and finally prepare an aluminum alloy composite round billet.

Furthermore, the above-mentioned method for preparing an aluminum alloy composite round billet, wherein, the surface of the cylindrical core aluminum alloy billet is cleaned before being preheated.

The outstanding substantive features and remarkable progress of the technical solution of the present invention are mainly reflected in:

The process of the invention is simple, and the thickness distribution of the outer layer aluminum alloy of the prepared aluminum alloy composite round billet is uniform, and it is closely combined with the inner layer alloy without gaps, and there is no need to modify the existing casting equipment, which can reduce the procedures and costs caused by mechanical assembly. Overcome the problem of gas residue between the inner and outer layers, effectively improve production efficiency and reduce production costs. Moreover, this technology is not limited by the variety of alloys. Composite round ingots of various aluminum alloy combinations are prepared, and aluminum alloy composite tubes are prepared through subsequent extrusion, drawing and other processes, and then used for heat exchange components such as air conditioners and refrigerators. and other fields of application.

Description of drawings

Below in conjunction with accompanying drawing, technical solution of the present invention will be further described:

Fig. 1 is the schematic sectional view of embodiment 1 composite round billet;

Fig. 2 is a schematic cross-sectional view of the composite round ingot in Example 2.

Detailed ways

The preparation method of the aluminum alloy composite round billet of the present invention comprises coating the outer layer aluminum alloy liquid on the cylindrical core material aluminum alloy billet, and preparing the composite round billet through semi-continuous casting; first melting the outer layer aluminum alloy, Refining, and preheating the cylindrical core aluminum alloy billet to room temperature ~ 600°C in a heat treatment furnace, and keeping it warm; take out the preheated cylindrical core aluminum alloy billet through the crystallizer and place it on the base of the dummy ingot equipment , and centered; the aluminum liquid at 700~780°C is uniformly entered into the crystallizer through the preheated launder and splitter plate, and completely covers the cylindrical core material aluminum alloy billet in the crystallizer; the aluminum alloy in the crystallization area The semi-continuous casting starts when the liquid solidifies, and finally the aluminum alloy composite round ingot is prepared.

The aluminum alloy billet with a cylindrical core material can be a solid billet or a hollow billet. The inner and outer layer alloys have a wide range of choices, and can be prepared into composite round ingots with various aluminum alloy combinations according to different occasions, especially when the outer layer alloy is Al-Si alloy, it can be used for brazing occasions. The surface of the cylindrical core aluminum alloy rod needs to be cleaned, and the surface roughness is reasonably controlled.

Example 1:

First melt and refine the outer aluminum alloy, and preheat the cylindrical core aluminum alloy solid rod in a heat treatment furnace to 600°C for a period of time; take out the preheated cylindrical core aluminum alloy solid rod and pass it through the crystallizer Put it on the base of the dummy ingot equipment, and do a good job of centering control; then the aluminum liquid at 700 ℃ enters the crystallizer evenly through the preheated launder and splitter plate, completely covering the cylindrical core in the crystallizer Aluminum alloy solid rod; semi-continuous casting starts when the aluminum liquid in the crystallization area solidifies, and finally an aluminum alloy composite round ingot is prepared. As shown in FIG. 1 , the prepared aluminum alloy composite round billet includes an outer layer aluminum alloy 1 and a cylindrical core material aluminum alloy 2 , and the cylindrical core material aluminum alloy 2 is a solid billet. the

Example 2:

After the outer aluminum alloy is melted and refined, the room-temperature core aluminum alloy hollow rod is passed through the crystallizer and placed on the base of the dummy ingot equipment, and the centering control is done; then the aluminum liquid at 780°C is passed through the pre- The hot launder and splitter plate enter the crystallizer evenly, and completely cover the core aluminum alloy hollow rod in the crystallizer; semi-continuous casting starts when the molten aluminum in the crystallization area solidifies, and finally prepares an aluminum alloy composite round ingot . As shown in FIG. 2 , the aluminum alloy composite round billet includes an outer layer of aluminum alloy 1 and a cylindrical core material of aluminum alloy 2 , and the cylindrical core material of aluminum alloy 2 is a hollow billet.

To sum up, the preparation method of the present invention is simple in process, and the thickness distribution of the outer layer aluminum alloy of the prepared aluminum alloy composite round ingot billet is uniform, and it is closely combined with the inner layer alloy without gaps, and there is no need to modify the existing casting equipment, which can reduce the The process brought by mechanical assembly and the problem of gas residue between the inner and outer layers can be overcome, which can effectively improve production efficiency and reduce production costs. Moreover, this technology is not limited by the variety of alloys. Composite round ingots of various aluminum alloy combinations are prepared, and aluminum alloy composite tubes are prepared through subsequent extrusion, drawing and other processes, and then used for heat exchange components such as air conditioners and refrigerators. and other fields of application.

It should be understood that: the above is only a preferred embodiment of the present invention, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the protection scope of the present invention.

Claims (2)

1. The method for preparing an aluminum alloy composite round ingot is characterized in that: the outer layer of aluminum alloy liquid is coated on the cylindrical core material aluminum alloy billet, and the composite round ingot is prepared by semi-continuous casting; including the following process steps : 1) Melt and refine the outer aluminum alloy, and preheat the cylindrical core aluminum alloy billet in a heat treatment furnace to room temperature ~ 600 ° C, and keep it warm; 2) Take out the preheated cylindrical core aluminum alloy billet and put it on the base of the dummy ingot equipment through the crystallizer, and center it; pass the aluminum liquid at 700~780°C through the preheated launder and splitter plate evenly Enter the crystallizer and completely cover the cylindrical core material aluminum alloy billet in the crystallizer; 3) Start semi-continuous casting when the molten aluminum in the crystallization zone is solidified, and finally prepare an aluminum alloy composite round billet. 2. The method for preparing an aluminum alloy composite round billet according to claim 1, characterized in that: the surface of the cylindrical core aluminum alloy billet is cleaned before being preheated.

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