Pressure casting and heat treatment process of zinc alloy

Abstract

The invention provides a novel zinc alloy for a bearing and a corresponding pressure casting and heat treatment process. The pressure casting and heat treatment process comprises the steps of raw material preparation, melting, and pressure casting and heat treatment and the like. The zinc alloy is excellent in mechanical performance, especially the strength and the hardness suitable for a heavy-load and high-temperature environment. The pressure casting and heat treatment process of the zinc alloy specifically comprises the following steps: preparing raw materials through a proper amount of simple alloy elements; obtaining a casting through a proper melting process and subsequent pressure casting; and subjecting the casting to heat treatment and obtaining the zinc alloy, wherein the elements, the melting process, the pressure casting process parameters and the heat treatment process parameters of the alloy are all optimized to obtain a product with excellent performance.

Description

technical field

[0001] The invention relates to the technical field of the application of zinc and its alloys in the mechanical industry, in particular to provide a new type of zinc alloy used in wear-resistant parts such as bearings, and a corresponding die-casting and heat treatment process. Background technique

[0002] In the field of machinery industry, the sliding bearing alloys mainly use traditional copper-based alloys and babbitt alloy castings, but the raw materials and manufacturing costs of these two alloys are very high, especially with the rapid development of electronic communication and other industrial fields, for copper The demand for copper is increasing day by day. In addition, copper is a scarce resource in my country. As a result, my country needs to import a large amount of copper from abroad every year, which further reduces the space for copper-based alloys to be used as raw materials for bearing components.

[0003] In order to replace the traditiona...

Examples

Embodiment 1-4， and comparative example 1-9

[0016] 1) Ingredients: According to the alloy ratio given in Table 1, the alloy ingredients come from pure zinc with a purity of 99.99%, aluminum-silicon alloy with a weight ratio of 1:1, zinc-antimony alloy with a weight ratio of 1:1, Aluminum scandium alloy, electrolytic copper, industrial pure magnesium, pure aluminum and other raw materials with a weight ratio of 1:1.

[0017] 2) Melting: first place pure zinc in a smelting furnace and heat up to 460°C for 10 minutes, then raise the temperature to 830°C and add industrial pure aluminum, aluminum-silicon alloy, aluminum-scandium alloy and electrolytic copper and continue stirring until the aluminum-silicon alloy and electrolytic copper are completely melted, then lower the temperature to 690°C and add zinc-antimony alloy and continue to stir until the zinc-antimony alloy is completely melted, then lower the temperature to 640°C and press industrial pure magnesium to the bottom of the melt for at least 5 minutes, then stir th...

Embodiment 5-7

[0029] In Examples 5-7, and Comparative Examples 10-17, the chemical composition of the alloy is the same as in Example 2, and the optimization of process parameters in the die-casting process is mainly investigated. The selection of parameters and performance results are shown in Table 2.

[0030] Although it is a well-known technology in the art to use two different melt flow rates of low speed and high speed to control defects such as pores in the die-casting process, it can be seen from the results in Table 2 that how to choose the melt flow rate and casting pressure still has a great influence :

[0031] For the melt flow rate and casting pressure of the zinc alloy of the present invention at the low-speed stage, the melt flow rate should be controlled between 0.5-0.8m / s. Too low melt flow rate will cause the melt to cool down too fast and affect the die-casting of the melt performance, which eventually deteriorates the mechanical properties of the alloy, and is also not ...

Embodiment 8-9

[0036] Examples 8-9, and Comparative Examples 18-21, the chemical composition of the alloy is the same as that of Example 2, and the optimization of heat treatment process parameters is mainly investigated. The selection of parameters and performance results are shown in Table 3.

[0037] table 3

[0038]

[0039]

[0040] It can be seen from the results in Table 3 that the homogenization temperature should not be too low, and it needs enough time, otherwise it will be difficult to eliminate stress and improve the mechanical properties; on the contrary, if the temperature is too high, it may cause changes in the structure and seriously affect the mechanical properties. . The aging temperature must also be appropriate. Too low aging temperature and time cannot play a role in obtaining stable mechanical properties, while too high aging temperature will seriously affect the strength of the alloy.

[0041] To sum up, the present invention first rationally designs the composit...

technical field

[0001] The invention relates to the technical field of the application of zinc and its alloys in the mechanical industry, in particular to provide a new type of zinc alloy used in wear-resistant parts such as bearings, and a corresponding die-casting and heat treatment process. Background technique

[0002] In the field of machinery industry, the sliding bearing alloys mainly use traditional copper-based alloys and babbitt alloy castings, but the raw materials and manufacturing costs of these two alloys are very high, especially with the rapid development of electronic communication and other industrial fields, for copper The demand for copper is increasing day by day. In addition, copper is a scarce resource in my country. As a result, my country needs to import a large amount of copper from abroad every year, which further reduces the space for copper-based alloys to be used as raw materials for bearing components.

[0003] In order to replace the traditiona...

Examples

Embodiment 1-4， and comparative example 1-9

[0016] 1) Ingredients: According to the alloy ratio given in Table 1, the alloy ingredients come from pure zinc with a purity of 99.99%, aluminum-silicon alloy with a weight ratio of 1:1, zinc-antimony alloy with a weight ratio of 1:1, Aluminum scandium alloy, electrolytic copper, industrial pure magnesium, pure aluminum and other raw materials with a weight ratio of 1:1.

[0017] 2) Melting: first place pure zinc in a smelting furnace and heat up to 460°C for 10 minutes, then raise the temperature to 830°C and add industrial pure aluminum, aluminum-silicon alloy, aluminum-scandium alloy and electrolytic copper and continue stirring until the aluminum-silicon alloy and electrolytic copper are completely melted, then lower the temperature to 690°C and add zinc-antimony alloy and continue to stir until the zinc-antimony alloy is completely melted, then lower the temperature to 640°C and press industrial pure magnesium to the bottom of the melt for at least 5 minutes, then stir th...

Embodiment 5-7

[0029] In Examples 5-7, and Comparative Examples 10-17, the chemical composition of the alloy is the same as in Example 2, and the optimization of process parameters in the die-casting process is mainly investigated. The selection of parameters and performance results are shown in Table 2.

[0030] Although it is a well-known technology in the art to use two different melt flow rates of low speed and high speed to control defects such as pores in the die-casting process, it can be seen from the results in Table 2 that how to choose the melt flow rate and casting pressure still has a great influence :

[0031] For the melt flow rate and casting pressure of the zinc alloy of the present invention at the low-speed stage, the melt flow rate should be controlled between 0.5-0.8m / s. Too low melt flow rate will cause the melt to cool down too fast and affect the die-casting of the melt performance, which eventually deteriorates the mechanical properties of the alloy, and is also not ...

Embodiment 8-9

[0036] Examples 8-9, and Comparative Examples 18-21, the chemical composition of the alloy is the same as that of Example 2, and the optimization of heat treatment process parameters is mainly investigated. The selection of parameters and performance results are shown in Table 3.

[0037] table 3

[0038]

[0039]

[0040] It can be seen from the results in Table 3 that the homogenization temperature should not be too low, and it needs enough time, otherwise it will be difficult to eliminate stress and improve the mechanical properties; on the contrary, if the temperature is too high, it may cause changes in the structure and seriously affect the mechanical properties. . The aging temperature must also be appropriate. Too low aging temperature and time cannot play a role in obtaining stable mechanical properties, while too high aging temperature will seriously affect the strength of the alloy.

[0041] To sum up, the present invention first rationally designs the composit...

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