阅读说明：本技术 高压电气系统传动箱及其铸造工艺 (High-voltage electrical system transmission case and casting process thereof ) 是由 李小俊 于 2020-07-15 设计创作，主要内容包括：本发明公开了高压电气系统传动箱及其铸造工艺,高压电气系统传动箱包括按重量百分比计的以下成分：Gb0.5-0.7％、Nb0.2-0.4％、Co0.8-1.0％、Ni0.1-0.3％、Si6.5-7.5％、Fe0.1-0.3％、Cu0.1-0.3％、Mn0.1-0.2％、Mg0.25-0.45％、Sr0.008-0.015％、Zn0.1-0.2％、Ti0.1-0.3％,余量为Al和不可避免的杂质。元素Gb的加入,对Si元素具有消耗作用,进而对合金内部具有明显的变质作用,细化晶粒,提高高压电气系统传动箱的力学性能；Nb元素的加入,其作为一种超导材料,可大大提高高压电气系统传动箱导电能力,降低电流损失；Co元素的添加,提高高压电气系统传动箱的物理性能、耐热性,提高高压电气系统传动箱的整体性能,保证其使用寿命。(The invention discloses a high-voltage electric system transmission case and a casting process thereof, wherein the high-voltage electric system transmission case comprises the following components in percentage by weight: gb 0.5-0.7%, Nb0.2-0.4%, Co0.8-1.0%, Ni0.1-0.3%, Si 6.5-7.5%, Fe0.1-0.3%, Cu0.1-0.3%, Mn0.1-0.2%, Mg0.25-0.45%, Sr0.008-0.015%, Zn0.1-0.2%, Ti0.1-0.3%, and the balance of Al and inevitable impurities. The addition of the element Gb has a consumption effect on Si element, so that the alloy has an obvious modification effect on the interior of the alloy, the crystal grains are refined, and the mechanical property of a transmission case of a high-voltage electrical system is improved; the Nb element is added as a superconducting material, so that the conductivity of a transmission case of a high-voltage electrical system can be greatly improved, and the current loss is reduced; the addition of Co element improves the physical property and heat resistance of the transmission case of the high-voltage electrical system, improves the overall performance of the transmission case of the high-voltage electrical system and ensures the service life of the transmission case.)

1. The transmission case of the high-voltage electrical system is characterized by comprising the following components in percentage by weight: gb 0.5-0.7%, Nb0.2-0.4%, Co0.8-1.0%, Ni0.1-0.3%, Si 6.5-7.5%, Fe0.1-0.3%, Cu0.1-0.3%, Mn0.1-0.2%, Mg0.25-0.45%, Sr0.008-0.015%, Zn0.1-0.2%, Ti0.1-0.3%, and the balance of Al and inevitable impurities.

2. A casting process of a transmission case of a high-voltage electrical system according to claim 1, comprising the steps of:

(1) adding an aluminum ingot into a smelting furnace for melting, adding silicon when the temperature of molten metal is raised to 810-820 ℃, stirring the molten metal until the silicon is completely melted, and standing for 5-7 min; then the temperature is raised to 840 ℃ and 860 ℃, Nb, Co, Fe, Cu, Mn and Zn are added into the molten metal; stirring the molten metal and heating the molten metal, adding Ni, Mg and Sr when the molten metal reaches 870-; adding Gb and Ti, and stirring for 15-25 min;

(2) cooling the aluminum alloy melt to 750-770 ℃, adding a refining agent, spraying nitrogen or inert gas for refining, and keeping the temperature for refining for 20-25min each time; then, slagging off and filtering are sequentially carried out to obtain refined aluminum alloy melt; sampling and testing the chemical components of the alloy, comparing the difference between the designed components and the actually measured components, and finely adjusting to ensure that the alloy components meet the requirements of the designed components;

(3) injecting the refined molten aluminum alloy which is qualified in the test into a high-voltage electric system transmission case die, and performing casting molding; and cooling to room temperature to obtain the high-voltage electric system transmission case.

3. The casting process of the high-voltage electrical system transmission case according to claim 2, wherein: in the step (2), the refining agent is potassium tetrafluoroaluminate, and the addition amount of the refining agent is 0.2-0.3% of that of the aluminum alloy solution.

Technical Field

The invention relates to the technical field of casting of high-voltage electric system transmission boxes, in particular to a high-voltage electric system transmission box and a casting process thereof.

Background

In the national power industry, such as high-voltage electrical systems of power stations, substations and the like, transmission cases are required. The performance of a high-voltage electrical system transmission box as part of a high-voltage electrical system directly affects the stability of the operation of the high-voltage electrical system. The transmission case of the high-voltage electrical system also has the main performance of mechanical property. Therefore, the technical problem to be solved by the invention is how to design the high-voltage electric system transmission case with excellent mechanical property and the casting process thereof.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the high-voltage electric system transmission case with excellent mechanical property and the casting process thereof.

The invention solves the technical problems through the following technical means:

the transmission case of the high-voltage electrical system comprises the following components in percentage by weight: gb 0.5-0.7%, Nb0.2-0.4%, Co0.8-1.0%, Ni0.1-0.3%, Si 6.5-7.5%, Fe0.1-0.3%, Cu0.1-0.3%, Mn0.1-0.2%, Mg0.25-0.45%, Sr0.008-0.015%, Zn0.1-0.2%, Ti0.1-0.3%, and the balance of Al and inevitable impurities.

Preferably, the casting process of the high-voltage electric system transmission case comprises the following steps:

(1) adding an aluminum ingot into a smelting furnace for melting, adding silicon when the temperature of molten metal is raised to 810-820 ℃, stirring the molten metal until the silicon is completely melted, and standing for 5-7 min; then the temperature is raised to 840 ℃ and 860 ℃, Nb, Co, Fe, Cu, Mn and Zn are added into the molten metal; stirring the molten metal and heating the molten metal, adding Ni, Mg and Sr when the molten metal reaches 870-; adding Gb and Ti, and stirring for 15-25 min;

(2) cooling the aluminum alloy melt to 750-770 ℃, adding a refining agent, spraying nitrogen or inert gas for refining, and keeping the temperature for refining for 20-25min each time; then, slagging off and filtering are sequentially carried out to obtain refined aluminum alloy melt; sampling and testing the chemical components of the alloy, comparing the difference between the designed components and the actually measured components, and finely adjusting to ensure that the alloy components meet the requirements of the designed components;

(3) injecting the refined molten aluminum alloy which is qualified in the test into a high-voltage electric system transmission case die, and performing casting molding; and cooling to room temperature to obtain the high-voltage electric system transmission case.

The refining agent is potassium tetrafluoroaluminate, and the addition amount of the refining agent is 0.2-0.3% of that of the aluminum alloy solution.

The invention has the advantages that: the addition of the element Gb has a consumption effect on Si element, so that the alloy has an obvious modification effect on the interior of the alloy, the crystal grains are refined, and the mechanical property of a transmission case of a high-voltage electrical system is improved; the Nb element is added as a superconducting material, so that the conductivity of a transmission case of a high-voltage electrical system can be greatly improved, and the current loss is reduced; the addition of Co element improves the physical property and heat resistance of the transmission case of the high-voltage electrical system, improves the overall performance of the transmission case of the high-voltage electrical system and ensures the service life of the transmission case.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The transmission case of the high-voltage electrical system comprises the following components in percentage by weight: gb 0.5-0.7%, Nb0.2-0.4%, Co0.8-1.0%, Ni0.1-0.3%, Si 6.5-7.5%, Fe0.1-0.3%, Cu0.1-0.3%, Mn0.1-0.2%, Mg0.25-0.45%, Sr0.008-0.015%, Zn0.1-0.2%, Ti0.1-0.3%, and the balance of Al and inevitable impurities.

Preferably, the casting process of the high-voltage electric system transmission case comprises the following steps:

(1) adding an aluminum ingot into a smelting furnace for melting, adding silicon when the temperature of molten metal is raised to 810-820 ℃, stirring the molten metal until the silicon is completely melted, and standing for 5-7 min; then the temperature is raised to 840 ℃ and 860 ℃, Nb, Co, Fe, Cu, Mn and Zn are added into the molten metal; stirring the molten metal and heating the molten metal, adding Ni, Mg and Sr when the molten metal reaches 870-; adding Gb and Ti, and stirring for 15-25 min;

(2) cooling the aluminum alloy melt to 750-770 ℃, adding a refining agent, spraying nitrogen or inert gas for refining, and keeping the temperature for refining for 20-25min each time; then, slagging off and filtering are sequentially carried out to obtain refined aluminum alloy melt; sampling and testing the chemical components of the alloy, comparing the difference between the designed components and the actually measured components, and finely adjusting to ensure that the alloy components meet the requirements of the designed components;

(3) injecting the refined molten aluminum alloy which is qualified in the test into a high-voltage electric system transmission case die, and performing casting molding; and cooling to room temperature to obtain the high-voltage electric system transmission case.

The refining agent is potassium tetrafluoroaluminate, and the addition amount of the refining agent is 0.2-0.3% of that of the aluminum alloy solution.

The addition of the element Gb has a consumption effect on Si element, so that the alloy has an obvious modification effect on the interior of the alloy, the crystal grains are refined, and the mechanical property of a transmission case of a high-voltage electrical system is improved; the Nb element is added as a superconducting material, so that the conductivity of a transmission case of a high-voltage electrical system can be greatly improved, and the current loss is reduced; the addition of Co element improves the physical property and heat resistance of the transmission case of the high-voltage electrical system, improves the overall performance of the transmission case of the high-voltage electrical system and ensures the service life of the transmission case.