Sintered bearing in mobile phone oscillating motor

Source: China Bearing Network Time: 2017-11-16

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The weight of the oscillating motor in the mobile phone is produced by powder metallurgy high specific gravity alloy. However, few people know it; the sintered bearing in the motor is only 0. 004g. The sintered bearing is also produced by powder metallurgy. The oil bearing has won the 2004 Production Technology Development Award of the Japan Powder Metallurgy Industry Association.
The ultra-small sintered bearing is used in an oscillating motor of a mobile phone; its scale is 0.7 mm (inner diameter) Ã— 1.29 mm (outer diameter) Ã— 0. 75 mm (length); oil content is 20% (volume fraction).
This ultra-small bearing is a raw material that uses low green density and high green strength; it is developed with simple molds and custom-made fine forming presses and finishing presses.
In order to have the best performance in mass production; the material powder used is a fine powder granule similar to the coarse powder powder developed jointly with the manufacturer. To prevent any damage; the need to select the appropriate mold material and forming process; forming / The loading shoe of the finishing press should have an aspirational loading speed; a suitable finishing lubricant should also be selected.
According to the application requirements of mobile phone oscillating motors at that time; the miniature (0.1 mm) and lightweight (0.1 mg) bearings that must be stabilized in production are used. This transformation skill is used; As small as 3mm Ã— 10mm. According to the layout of the motor, the outer diameter of the bearing determines the outer diameter of the oscillating motor. Therefore, the outer diameter of the bearing is reduced as much as possible. The bearing length is the span of the fixed bearing in the coupled bearing. distance.

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