Why Does Glass Need To Be Ground Polished Grinded before Entering The Glass Tempering Furnace? The Function And Method of Glass Grinding

When tempering glass, the stress of the glass is changed by heating the glass raw material through the tempering furnace to achieve the tempering effect. Ordinary glass raw materials need to undergo pre-treatment, cutting into the required size, and simple treatment before being tempered in the furnace, among which grinding is an important part. So many people are not sure why glass needs to be ground before being tempered in the furnace. Below, we will introduce the importance of glass grinding before entering the furnace and the methods of grinding.

1. Why do we need to grind the edges of glass before it enters the glass tempering furnace

1.1. The role of edge grinding before glass tempering

When grinding the edges of glass before tempering, in order to improve the yield of tempered glass, small and fine cracks may be left around during the early cutting of the glass. Although they are not visible to the naked eye, they are prone to edge breakage and breakage during tempering. The main function of grinding is to improve the aesthetic appearance of the glass and also improve the yield of the tempering process.

1.2. The hazards of poor edge grinding of tempered glass

During the heating and cooling process of ungrounded glass, cracks and defects at the edges of the glass can easily lead to the risk of furnace explosion when the stress is too high or uneven, causing significant damage to the equipment. At the same time, if the edges are not ground, there will be small glass slag around the glass. During the operation of the tempering furnace, it will fall onto the roller by swinging or blowing the cooling air, sticking to the surface of the glass and causing the produced tempered glass products to have pitting. This may also cause damage to the roller of the tempering furnace, and in severe cases, the furnace needs to be shut down for cleaning, delaying production progress and product quality.

2. Glass edge grinding method

2.1. Edge grinding method

Glass edge grinding machine is generally used for glass edge grinding, which is mainly used to flatten the glass or shape irregular glass edges. The specific operation method requires fastening the glass through front and rear pressure plates to drive its linear motion for grinding. The clamping force needs to be determined based on the thickness of the glass. If it is too tight, it will increase the load on the machine and cause vibration. When the glass is too thin, it is also easy to crush. The degree of clamping can be felt with both hands, and if it cannot be moved by hand, it is the appropriate clamping degree.

2.2. Operation steps

2.2.1. The diamond grinding wheel with metal bonding agent is used in sequence to trim the rough shape of coarse, medium, and fine (325 mesh), and the occurrence of edge collapse is a normal phenomenon.

2.2.2. Use a diamond grinding wheel with resin bonding agent to grind the broken edge position to a frosted surface without any broken edges, which is basically considered as finished grinding.

2.2.3. If you want to polish the edges of glass, you need to use polishing wheels and change them to low hardness polishing abrasives such as iron oxide and cerium oxide. Low hardness polishing abrasives such as cerium oxide can basically achieve the standard of transparency.

The above is an introduction to why glass needs to be ground before being tempered in the furnace, the hazards of poor grinding, the role of grinding in glass tempering, and the specific grinding methods and operating procedures. It is hoped that this can help everyone better understand the importance of grinding in tempered glass processing.