阅读说明：本技术 变压器用高纯度铝带的制备工艺 (Preparation process of high-purity aluminum strip for transformer ) 是由 范军均 于 2020-04-09 设计创作，主要内容包括：本发明公开了变压器用高纯度铝带的制备工艺,所述该高纯度铝带由以下元素组分按照重量百分比配制而成：Ag：0.7-0.8%,Cu≤0.9％,Cr≤0.07％,Mg≤0.02％,Mn≤0.01％,Fe≤0.15％,Zn≤0.05％,其中每种不可避免的杂质≤0.01％,余量为AL；该变压器用高纯度铝带的制备工艺,包括预处理、除铁、制备合金铝锭、分料、热轧、冷轧。本发明提出的变压器用高纯度铝带,在其内部添加0.7-0.8%银元素和≤0.9％的铜元素,使其形成的铝合金后内部导电性能提升,添加了≤0.07％的Ce,使成品铝带的抗拉强度有较大的提升,采用高纯度的1060铝板块作为铝原料,采用高强工业铷磁铁对其内部的还没有熔融的金属铁进行磁力吸附,可以对铝液进一步提纯,降低其内部的铁含量,提高成品铝带的导电性能。(The invention discloses a preparation process of a high-purity aluminum strip for a transformer, which is prepared from the following elements, by weight, 0.7-0.8% of Ag, less than or equal to 0.9% of Cu, less than or equal to 0.07% of Cr, less than or equal to 0.02% of Mg, less than or equal to 0.01% of Mn, less than or equal to 0.15% of Fe, less than or equal to 0.05% of Zn, less than or equal to 0.01% of inevitable impurities, and the balance of A L. the preparation process of the high-purity aluminum strip for the transformer comprises the steps of pretreatment, iron removal, preparation of an alloy aluminum ingot, material distribution, hot rolling and cold rolling.)

1. The preparation process of the high-purity aluminum strip for the transformer is characterized in that the high-purity aluminum strip is prepared from the following elements, by weight, 0.7-0.8% of Ag, less than or equal to 0.9% of Cu, less than or equal to 0.07% of Ce, less than or equal to 0.02% of Mg, less than or equal to 0.01% of Mn, less than or equal to 0.15% of Fe, less than or equal to 0.05% of Zn, less than or equal to 0.01% of each inevitable impurity, and the balance A L, and comprises the following steps:

A. pretreatment: selecting an aluminum plate with the mark of 1060, cleaning the surface of the aluminum plate by using an oil removal agent, and naturally drying the aluminum plate for later use after chemical oil removal;

B. iron removal: placing the aluminum plate into a smelting furnace, heating to the temperature of 700-;

C. preparing an alloy aluminum ingot: after the industrial strong magnet is taken out, other elements are added into the aluminum liquid to form alloy elements, the smelting furnace is heated to 1580 and 1630 ℃, the temperature is preserved for 30min, then the temperature is reduced to 950 +/-30 ℃, the temperature is preserved for 10-12h, and then the alloy aluminum ingot is obtained after natural cooling;

D. material distribution: cutting an alloy aluminum ingot into three-dimensional blocks with the size of 300 x 200mm, and placing the three-dimensional blocks into an extruder die to extrude an alloy cylinder with the diameter of 2-5cm, wherein the heating temperature of the aluminum ingot is 550-;

E. hot rolling: adding the alloy cylinder into a continuous rolling mill for hot rolling to form a hot-rolled alloy aluminum strip with the width of 90-450mm and the thickness of 15-40 mm;

F. cold rolling: and (3) cold rolling the hot-rolled alloy aluminum strip by using a cold continuous rolling mill, and winding by using a winding machine to obtain a finished product aluminum strip with the width of 90-450mm and the thickness of 0.3-10 mm.

2. The process for preparing a high-purity aluminum strip for transformers according to claim 1, wherein: the extrusion speed of the extruder in the step D is 30-40m/min, the extrusion barrel adopts a segmented heating method, the heating temperature of the head part of the extrusion barrel of the extruder is 440-450 ℃, the heating temperature of the middle part of the extrusion barrel is 435-445 ℃, and the heating temperature of the tail part of the extrusion barrel is 420-435 ℃.

3. The process for preparing a high-purity aluminum strip for transformers according to claim 1, wherein: and D, carrying out cold water spray-assisted cooling on the surface of the alloy cylinder extruded by the extruder in the step D and the surface of the tail end of the surface of the extrusion die.

4. The process for preparing a high-purity aluminum strip for transformers according to claim 1, wherein: the degreasing agent used in the pretreatment of the step A is formed by mixing a metal high-grade degreasing agent and water in a ratio of 1: 10.

5. The process for preparing a high-purity aluminum strip for transformers according to claim 1, wherein: the extruder in the step D is an 800T single-action horizontal extruder, and the extrusion ratio is 313-315.

Technical Field

The invention relates to the technical field of preparation of transformer aluminum strips, in particular to a preparation process of a high-purity aluminum strip for a transformer.

Background

The transformer aluminum strip is a key raw material for manufacturing a transformer winding and is a strip-shaped object obtained by rolling an aluminum ingot. Aluminum is a conventional metal with lower electrical and thermal conductivity than copper, as compared to the electrical conductivity of metals, but aluminum is widely popular by virtue of its low cost.

The pure aluminum has the best electric conductivity and heat conductivity, but the pure aluminum has low hardness and is relatively soft and not suitable for being processed into an aluminum strip for a transformer.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a preparation process of a high-purity aluminum strip for a transformer.

In order to achieve the purpose, the invention adopts the following technical scheme:

the preparation process of the high-purity aluminum strip for the transformer comprises the following elements, by weight, 0.7-0.8% of Ag, less than or equal to 0.9% of Cu, less than or equal to 0.07% of Cr, less than or equal to 0.02% of Mg, less than or equal to 0.01% of Mn, less than or equal to 0.15% of Fe, less than or equal to 0.05% of Zn, less than or equal to 0.01% of each inevitable impurity, and the balance A L, and comprises the following steps:

A. pretreatment: selecting an aluminum plate with the mark of 1060, cleaning the surface of the aluminum plate by using an oil removal agent, and naturally drying the aluminum plate for later use after chemical oil removal;

B. iron removal: placing the aluminum plate into a smelting furnace, heating to the temperature of 700-;

C. preparing an alloy aluminum ingot: after the industrial strong magnet is taken out, other elements are added into the aluminum liquid to form alloy elements, the smelting furnace is heated to 1580 and 1630 ℃, the temperature is preserved for 30min, then the temperature is reduced to 950 +/-30 ℃, the temperature is preserved for 10-12h, and then the alloy aluminum ingot is obtained after natural cooling;

D. material distribution: cutting an alloy aluminum ingot into three-dimensional blocks with the size of 300 x 200mm, and placing the three-dimensional blocks into an extruder die to extrude an alloy cylinder with the diameter of 2-5cm, wherein the heating temperature of the aluminum ingot is 550-;

E. hot rolling: adding the alloy cylinder into a continuous rolling mill for hot rolling to form a hot-rolled alloy aluminum strip with the width of 90-450mm and the thickness of 15-40 mm;

F. cold rolling: and (3) cold-rolling the hot-rolled alloy aluminum strip by using a cold continuous rolling mill, winding by using a winding machine to obtain a finished product aluminum strip, namely the aluminum strip with the width of 90-450mm and the thickness of 0.3-10mm, and winding by using the winding machine.

Preferably, the extrusion speed of the extruder in the step D is 30-40m/min, the extrusion barrel adopts a segmented heating method, the heating temperature of the head part of the extrusion barrel of the extruder is 440-.

Preferably, the surface of the alloy cylinder extruded by the extruder in the step D and the tail end surface of the extrusion die are both cooled by cold water spray assistance.

Preferably, the degreasing agent used in the pretreatment of the step A is formed by mixing a metal high-grade degreasing agent with water in a ratio of 1: 10.

Preferably, the extruder in the step D is a 800T single-action horizontal extruder, and the extrusion ratio is 313-315.

The invention has the following beneficial effects:

1. according to the high-purity aluminum strip for the transformer, the 1060 aluminum plate block with high purity is used as an aluminum raw material, after the aluminum raw material is heated to the melting point temperature, the high-strength industrial rubidium magnet is used for carrying out magnetic adsorption on the metal iron which is not melted in the aluminum strip, so that the aluminum liquid can be further purified, the iron content in the aluminum strip is reduced, other elements can be added conveniently in the later period, and the conductivity of the finished aluminum strip is improved.

2. According to the high-purity aluminum strip for the transformer, 0.7-0.8% of silver element and less than or equal to 0.9% of copper element are added into the high-purity aluminum strip, so that the internal conductivity of the formed aluminum alloy is improved, meanwhile, less than or equal to 0.07% of Ce is added, the tensile strength of the finished product aluminum strip is greatly improved, and the strength of the high-purity aluminum strip is improved.

Detailed Description

First, example section