Six influencing factors of glass cold working grinding

Six influencing factors of glass cold working grinding

2021-11-10 15:56:09 1

The cold processing of glass is mainly through two processes of grinding and polishing. So what are the main factors that affect glass grinding?

(I) Abrasive particle size

The abrasive particle size has a great influence on the grinding quality and grinding volume, and the grinding volume increases with the increase of abrasive granularity. For this reason, a coarser particle size can be used at the beginning of grinding to improve the grinding efficiency so that the glass products can reach a suitable shape or flatness in a shorter period of time. Then grind with fine abrasive particles step by step to gradually improve the quality of grinding and finally achieve the surface quality required for polishing. Abrasive particles according to its coarse and fine degree can be divided into granular (1523009m), powder (15 ~ 150vm) and fine powder (3.5 ~ 28pm) three categories, according to the requirements, the main particle size distribution should be 30% ~ 60%, fine powder particles shall not be more than 14% ~ 35%.

Glass grinding and abrasive particle size is directly related to the size of the abrasive, with the increase in abrasive particle size diameter, the amount of grinding also increased, the two almost linear relationship. However, if the particle size is too coarse, easy to scratch the glass surface, to the future polishing difficulties, so the choice of suitable particle size is both to improve the quality of grinding and can increase the amount of grinding important factors.

(II) Abrasive concentration and feeding amount

Abrasive is a suspension prepared by water, the addition of water can not only cool the heat generated by friction and contribute to the hydrolysis of the glass surface to generate silica gel film, and can also make the abrasive uniformly distributed on the surface of the abraded body.

Grinding efficiency (the amount of glass grinding) increases with the increase of abrasive concentration, but after a certain degree, continue to increase the concentration, the improvement of grinding efficiency is not obvious, and even shows a trend of reduction. This shows that the selection of the appropriate abrasive concentration is beneficial to improve the grinding efficiency and reduce the cost.

With the increase of abrasive feeding amount per unit time, all of them can improve the grinding amount of the glass. It is also shown that with the increase of abrasive particle size diameter and the increase of abrasive feed, both can significantly increase the grinding volume of glass, but there is an optimal choice between these two.

(III) Abrasive hardness

Abrasive hardness, grinding efficiency is high, such as silicon carbide hardness of 9.3 ~ 075 (Mohs), the grinding efficiency ratio of 05 ~ 4.5; quartz sand hardness of 7, the grinding efficiency ratio of 1. But the hardness of the abrasive easy to cause the surface of the abraded object has a greater depth of depression, often easy to damage the surface of the glass or make the indentation too deep. Increase the grinding and polishing time, so in the selection of abrasive hardness must take into account the performance of the glass. Hard glass, such as borosilicate system of water level meter glass, chemical reaction pot peephole window glass, instrument glass, etc. can be used with high hardness abrasives, such as diamond, corundum and other types of abrasives, its high grinding efficiency, abundant reserves, a wide range of sources of origin, for most of the glass grinding widely used. There are also softer materials such as pumice or volcanic ash as abrasives, which can be used for grinding some glass with low volume, such as picture tube glass, etc.

(iv) Grinding disc speed

Grinding disc speed affects the amount of glass grinding, the two are almost linear relationship. The faster the speed of the grinding disc, the more the abrasive is thrown out, the farther away from the center of the grinding disc, the greater the speed of the centrifugal, the more opportunities for friction between the glass and the abrasive, so that the amount of glass grinding increased. However, if the speed of the grinding disc is too fast, it will be counterproductive. It will also cause great internal stress on the glass, resulting in the glass breaking during the grinding process.

(V) Load pressure

In the grinding process, in order to improve the grinding volume and strengthen the friction between the glass and the abrasive, often add a pressure load on the glass, and with the increase in pressure load, the abrasive contact with the glass surface grinding force will increase, and the grinding efficiency will increase. However, too high a pressure load will reduce the friction between the glass and the abrasive, resulting in lower grinding efficiency and even affecting the rotational speed of the grinding disc.

(VI) grinding disc material

Hardness of the grinding disc material can improve the grinding efficiency, such as grinding efficiency with cast iron materials, non-ferrous metals, plastic. Can increase the depth of depression of the surface being ground, the hardness of the small plastic disc can make the surface of the ground glass depression shallow, so when the last grinding process using plastic discs, can shorten the polishing time. There are also directly bonded abrasive inlay on the grinding disc, eliminating the need to constantly adjust the abrasive particle size, concentration and feeding amount in the grinding process, process hygiene and labor intensity can also be significantly improved, which should be a process measure for future development.


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