The composition of machinable glass ceramics is usually fluor phlogopite, which is the most common glass at present. It has excellent comprehensive properties such as machinability, thermoelectric properties as well as corrosion resistance, and can meet the requirements of high-precision processing technology. Today, we will introduce to you the wearing characteristics of carbide drill bits for glass when processing glass.
1. The main cutting edge of carbide drill bits for glass is mainly involved in cutting during the machining process, so an obvious wear zone is formed on the main flank surface. Under normal circumstances, the top angle of the drill bit is relatively large. The main flank wear starts from the main cutting edge close to the tip, and gradually expands along the main cutting edge to the chisel edge. The main flank and chisel edge wear relatively uniformly.
2. In addition, a smooth wear zone is formed on the first flank surface of the drill bit, and the wear marks on this secondary flank surface can be clearly observed under a low-power optical microscope. After processing the fluor phlogopite glass, the diameter of the cutting part of the drill has changed, while the diameter of the drill for processing mild steel has remained unchanged. This is because when drilling fluor phlogopite glass materials, the drill bit wears faster. After the tool tip is worn, the secondary cutting edge actually plays the role of reaming, which causes the size of the drill bit in the diameter direction to decrease, so the first flank face is worn. This is the main feature that distinguishes the fluor phlogopite glass drilling process from metal cutting.
3. It is observed that the width of the chisel edge wear zone is equivalent to the wear width of the main flank, and the wear zone width is more obvious at the tool tip.
4. Abrasive wear and adhesive wear are the main forms of carbide tool wear, and chipping is the main form of abnormal wear of cemented carbide tools.
In summary, when drilling fluor phlogopite glass-ceramic materials, the wear patterns of cemented carbide tools include primary flank wear, secondary flank wear and chisel edge wear. The wear of the auxiliary flank of carbide bit for glass is a significant feature in the drilling process of fluor phlogopite glass material.