Follow some steps of the transformation of the glass. Click in the images to see the transformation.
1 – Selecção of the Glass Plate Cortar
This is the first operation, where the order is given by the operator of the cut table, where this opens the drawer of the glass classifier, that contains the type of desired glass (this glass could monolithic or be plated). After the cupping-glass enters and sucks/holds the glass and carries it to the cut table.
Once the glass is placed in the cut table, the cupping-glass is free to get another glass plate.
2 – Cut of the Glass Plate
After being carried through the improvement of the glass plate, it is ready to be cut in the cut table. After that, the glass plate is moved to the truncate table and there takes place the operation of truncation of the glass.
Then the operator separates glasses in a classifier and places it, methodically, in one easel.
3 – Edging the Glass
During the cut process, the glasses are scratched out in its surface with tools whose point of contact with the glass has a superior hardness to this. After it is pressured on the previously scratched out zone and the glass breaks in that area in a regular form. Once this operation is carried out, in the edges of the glasses appear small fictions that can be the origin of the breakings for thermal shock, mainly if the glass are absorbent glasses (covers).
This operation implyes an additional cost in the product, but it increases its mechanic resistance and security (for the manipulators and for the final users).
In a general way, the following types of edges are used:
4 – Carving the glass
Carving is any rip or opening operated in the glass with a treatment for clearing the edge.
The carvings can be:
Normalized or Standard - They are destinated to the assembly of metallic parts that provide the linking of tempered glasses between themselfs.
Special Not normalized - They are destinated to the assembly of the glass, respecting the requirements of the place where the glass will be placed.
5 – Washin the Glass
After the glass is molded to the necessities of the customer, it is ready to temper, but before it is convenient to remove all the dirtiness that comes with the stages of manufacturing the tempered glass. For this the glass is washed with hot water and with a immineralized water, to obtain a glass more clear.
6 – Oven
The glass is warmed at 700ºC, and submitted to an sudden cooling, which enables the glass to increase its resistance to the mechanical tensions, thus diminishing ruptures for mechanical shock, flexion and thermal shock.
In this way the surface is submitted to forces of compression, and the interior submitted to traction forces. The intensities of this forces vary according to the thermal graduation established at the moment of its cooling.
These tensions originate certain deformations in the glasses, that may origin optical distortions. The choice of the dimensions of glasses represents an important role in the deformation that may occur.
7 – Expedition of the Tempered Glass
Once time the easel is placed in the expedition zone. The glasses must be separate by cues of cork or rubber, to prevent the scratching during the transport.