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Zinc alloy bearing

A zinc alloy and bearing technology, which is applied in the field of bearing application in the machinery industry, can solve the problems of wide alloy solidification temperature range, low service temperature, and affecting the application of zinc-based alloys, and achieve excellent abnormal temperature mechanical properties, improved performance, and excellent die-casting and the effect of aging performance

Active Publication Date: 2015-04-15
苏州利达铸造有限公司
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Problems solved by technology

Although zinc-based alloys also have excellent strength, plasticity, toughness and other mechanical properties, as well as excellent wear resistance and antifriction properties, the proportions of the main alloy components vary greatly, and the alloy solidification temperature range is wide, and the casting process is prone to defects such as porosity and segregation. , seriously affects the application of zinc-based alloys, and its service temperature is also low, often due to the large amount of heat generated by friction and wear under heavy load conditions, the temperature of the parts is overheated and it is difficult to use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4， and comparative example 1-9

[0014] 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.

[0015] 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

[0027] 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.

[0028] 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 :

[0029] 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

[0035] In Examples 8-9, and Comparative Examples 18-21, the chemical composition of the alloy is the same as in 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.

[0036] table 3

[0037]

[0038] 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.

[0039] To sum up, the present invention first rationally designs the composition of the z...

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Abstract

The invention provides a novel zinc alloy used for bearings and a bearing prepared therefrom. The zinc alloy comprises, by weight percentage (wt.%): 17-20% of Al, 2.5-4.5% of Cu, 0.05-0.1% of Mg, 1.5-3% of Si, 0.02-0.05% of Sb, 0.05-0.1% of Sc, and the balance Zn and unavoidable impurities. The bearing has excellent mechanical properties, especially has the strength and hardness suitable for use under heavy load and high temperature environments. By means of burdening, smelting, pressure casting and heat treatment, the zinc alloy can be obtained. Specifically, the alloy components, the smelting, the technological parameters of pressure casting and the technological parameters of heat treatment all undergo optimal selection so as to obtain the zinc alloy with excellent performance. Then, finish machining is carried out on the surface of the zinc alloy so as to obtain a bearing product.

Description

technical field [0001] The invention relates to the technical field of bearing application in the machinery industry, and in particular provides a zinc alloy bearing. 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 traditional copper-based alloys, zinc-based alloy castings are widely used as wear-resistant and anti-friction materials in the manufactur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C18/04C22C1/03B22D17/00C22F1/16
Inventor 季吉清
Owner 苏州利达铸造有限公司
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