High-strength miniature oil-impregnated bearing and its production method

Abstract

The invention discloses a high-strength miniature oil-impregnated bearing and its production method, which is characterized in that: it is prepared from the following components and parts by weight: BRO-AG1L3-YY-150? ? 45.4-54.7, DFRCU-CSA-100? ? ? 23.3-31.6, HJT-CE-300? ? 16.1-31.3, zinc stearate 0.36, nickel-coated molybdenum disulfide 1.24, graphite 0.22, dispersion enhancer SD-8000? ? 0.14, zinc powder 0.32, tin powder 1.02, the above-mentioned components are mixed and then molded and pressed, and then sintered. The product of the present invention has super strength, small deformation, small shrinkage, high hardness, good product height and inner hole consistency, and can ensure that the inner hole size does not shrink when the product is extruded and wrapped by plastic at 300°C. , the use performance is also very stable, which can completely exceed the customer's use requirements and the current international market requirements.

Description

technical field [0001] The invention relates to the technical field of bearings, in particular to a low-noise, long-life, high-strength miniature oil-impregnated bearing and a production method thereof. Background technique [0002] In recent years, with the rapid development of the economy and the rapid development of cultural undertakings, people have higher and higher requirements for electronic products, especially the quality requirements for oil bearings matched with electronic products are also correspondingly more stringent, mainly in the application of electronic products and equipment In industries such as precision electronic motors, mobile phone vibration motors, massage equipment, etc., oily bearings are required to have a small friction coefficient, stable operation, high speed (20000r.p.m), especially small vibration and noise, and long service life. Generally, continuous operation is required for 48 hours above. In order to meet people's high-performance and...

AI Technical Summary

Problems solved by technology

Although the performance and quality of the above-mentioned products have been improved, they are expensive and difficult to promote

At present, the production formula of domestic copper-based oil-impregnated bearings is generally 97.2% copper tin 10 plus 1% graphite plus 0.8% zinc stearate. After mixing and pressing, after sintering at a temperature of 650°C~720°C~720°C, Ф0. 6*, Ф1.6*, 1.25 and other types of products have a strength of 4.0~5.0kgf, and the shrinkage is inconsistent by 1.6 (-0.01~+0.02), which causes the outer diameter to be out of round, so the pressed product is prone to poor consistency of the inner hole during finishing. , The height fluctuates greatly, because the strength is not high enough, and the high temperature of injection molding when installing the micro-motor is likely to cause shrinkage, which makes it very difficult to really make this oil-impregnated bearing. The above defects are caused by the following reasons:

[0003] 1. Raw material batches fluctuate greatly, particle size composition is unreasonable, and heating is uneven

2. The formula shrinks greatly and is inconsistent, the powder is not filled, and the powder is mixed unevenly. 3. The selection and deployment of lubricating oil are improper

4. The most important thing is that the formula of raw materials is not reasonable and the production process is not scientific.