2015年1月20日星期二

Tungsten Carbide Dental Burs

Tungsten carbide dental burs can be used to cut or polish a wide variety of materials encountered in dentistry. These include tooth material such as enamel, dentine and bone, dental materials such as amalgam, composite, glass-ionomer cements, polymer and ceramic veneers and precious and not-precious alloys. The bur pattern will be selected to cut a specific material in a specific application and the following table gives guidance on selection.

Used burs should be considered as contaminated and appropriate handling precautions should be taken during reprocessing. Gloves, eye protection and a mask should be worn. Other measures may be required if there are specific infection or cross-contamination risks from the patient.
With the exception of steel burs, which are single use devices, reprocessing will have little effect on dental burs. The end of life is determined by wear and damage in use and the burs should be inspected for defects during the preliminary cleaning process.

Tungsten Carbide Dental Burs Used Safety Notes
Eye protection must be worn to protect against ejected particles.
Surgical mask must be worn to avoid inhalation of aerosol or dust generated.
Inspect the bur for broken flutes before each use and discard defective burs.

2015年1月9日星期五

Tungsten Carbide Turing Tool

Chinatungsten Online are able to provide kinds of tungsten carbide turning tools, With the state ofthe art production line and the advanced manufacturing process in the world, the company provides customers with inserts for turning, milling, boring, grooving and threading in finishing, semi-finishing or roughing application.

Tungsten carbide turning tool have extremely high hardness and wear resistivity compared with conventional steel materials, and it is expected that the tungsten carbide can be applied widely to dies and molds in the near future. In order to develop an efficient machining method of tungsten carbide for the dies and molds, series of cutting experiments were carried out to turn the sintered tungsten carbide materials with CBN tool. The selected sintered tungsten carbide workpieces are those containing tungsten carbide grains with mean grain size of 5μm, and 15wt%, 20wt% and 22wt% of cobalt binder. The sintered CBN tool selected contains super-fine grains of CBN with mean grain size of 1μm. The cutting speed was varied from 10m/min to 60m/min, and the tool wear and the surface roughness were measured. It is concluded that the tool wear is less when cutting the sintered tungsten carbide containing larger amount of cobalt binder. The surface roughness of about 2μm in Rz is obtained.