At first, it was thought that the damage of glass material was purely brittle failure and did not produce plastic damage; it was believed that the scratching and rolling of abrasives on the glass surface caused brittle cone-shaped cracks on the glass surface layer. These cracks crossed each other and broke into fragments. Thereby removing a certain thickness of glass. The mechanism of this brittle failure is based on the irregular network structure of the glass. In fact, many phenomena are not easy to explain from the perspective of brittle failure.
The grinding process of architectural glass is usually to grind the edge of the glass. The process of grinding glass is complicated. The grinding process is divided into three stages, followed by the sliding of abrasive particles on the glass surface, ploughing and chip formation. The three stages of the grinding process are related to the cutting thickness during grinding, that is, the grinding thickness of the abrasive particles is at the critical grinding thickness hmi. Below, the abrasive grains only produce slippage and ploughing on the glass surface, without producing chips.
From the perspective of the grinding mechanism of abrasive grains, the direction of improving the grinding efficiency of diamond glass grinding wheels has already appeared: At present, some people have made progress in the spatial geometric size arrangement of diamond single-product abrasive grains and applied them in engineering practice. It is beneficial to reduce the consumption of diamond, increase chip space, uniform distribution or reduce grinding force. On this basis, some people have selected the polyhedral diamond-single product in its arrangement direction for preferential directional positioning J (that is, the acute angle is directed to the most favorable cutting direction) and successfully applied to the diamond (stone) cutting saw blade . We can expect that if these technological achievements can be transplanted to diamond glass grinding wheels, it will increase abrasive cutting, greatly reduce abrasive friction and ploughing, thereby effectively reducing grinding force, reducing friction heat, It is very beneficial to improve the quality of the grinding surface and increase the service life of the diamond grinding wheel.
Glass straight-line edging: There are two situations when glass straight-line edging. One requires the straight edge to be machined to be arc-shaped (or C-shaped), and the other requires the straight edge to be machined with 45" corners on both sides. There are also two types of processing machines. One is a straight round edge. The most common one is 9 or 10 grinding heads; the other is a straight edge cornering machine, usually 8 grinding heads, the glass moving speed is 0.5 ^-3.5m/min. There is also a company’s straight edge machine marked The processing speed of the machine is 1~8m/min, the maximum processing size is 6000mm, and the maximum processing thickness is 30mm.
Regardless of whether the straight edge is C-shaped or has 45" corners on both sides, a diamond grinding wheel is required for chamfering (grinding straight C-shaped edges also requires 45" small corners in the process). The glass linear edging machine must use at least four diamond grinding wheels to complete the process requirements.
Glass straight-line bevel edging: When glass straight-line bevel edging, the bevel angle of the glass after processing is required to be 30^-450. In general, the moving speed of the glass is 0.5-4.2m/min. The glass straight beveling machine has 13 grinding heads, and some can omit 8 grinding heads. The number of grinding heads directly affects the grinding efficiency and surface quality.
The requirements for edging of tempered glass for building doors and windows and curtain walls: According to the industry standard JG/T455-2014 "Toughened Glass for Building Doors and Windows and Curtain Walls" promulgated in September 2014, the edge processing of tempered glass for building doors and windows and curtain walls can be chamfered Or three-side fine grinding, the chamfer width should not be less than 1mm; the tempered glass for glass curtain wall and daylighting roof should be three-side fine grinding or three-side polishing, and the chamfer width should not be less than 1mm.