What is a dental bearing? Few people may know such a bearing, and the general dentist may know more, because dental drill bearings are mainly used for dental dentist mobile phone special bearings. Based on the understanding of dental drill bearings, share the following relevant information.
What is a dental bearing?
There is a key component on the dentist's mobile phone, called the high-speed dental drill component. The high-speed turbo dental drill mobile phone bearing is a mechanical bearing composed of shafts, worm gears, spring chucks, spring gaskets, back covers, housings, rolling bearings, rubber positioning rings and other parts. The rolling bearings used are called dental bearing. The turbine, the bearing and the shaft have an interference fit, and the compressed air drives the whole high-speed rotation to drive the spring chuck and drill bit installed in the shaft hole to work.
dental bearing material performance characteristics
1. The bearing material is critical to its accuracy, performance and life. The high-speed turbine dental drill mobile phone bearing ring material should use special anti-corrosion stainless steel, the material of the ball should be Si3N4 ceramic ball with small thermal expansion coefficient, and the material of the cage should be polyimide TORLON which is resistant to compression, impact and high temperature.
2. Strict bearing processing technology is the key to product success.The bearing ring processing technology should be optimized according to the structural characteristics and technical requirements of high-speed dental drill bearings, and the reasonable process retention, dust-proof structure and key characteristic parameters should be determined. A solid crown-shaped cage formed by lathe processing.
dental bearing installation and maintenance
When the dental bearing is installed, the interference between the bearing internal control and the shaft is best at 0 ~ 2μm. The circular deviation of the shaft should be less than 2μm. The force of pressing the shaft into the inner hole of the bearing should directly act on the inner ring of the miniature bearing, and must not pass the action of the steel ball or the ring groove of the ring, so as not to damage the bearing accuracy. After installing a pair of bearings on the turbine, the turbine and bearings must be cleaned and dripped into the lubricating oil before installation into the machine head (acetone or ethanol cannot be used for the cleaning fluid). When inserting the dental drill bearing into the machine head, a certain axial preload (size 1 ~ 2N) should be applied to a pair of bearings to obtain the ideal high-speed performance.
After the installation of the dental bearing is completed, check that the shaft can not have axial series motion and the bearing rotates flexibly. If the axial preload is too tight or too loose, you should replace the washer or increase or decrease the gasket to ensure the correct preload after the dental bearing is installed, to prevent the dental bearing from slipping or spinning during high-speed operation. The normal operation and service life of dental bearing are closely related to the maintenance of the turbine head. In the clinical use of high-speed dental drills, the turbine head must be cleaned and maintained every day. Before use, the turbine head should be removed and added with cleaning fluid, and then fixed by hand to keep the drill fixed and not turned. Pass compressed air for a few seconds to clean and lubricate before use.
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