BENT GLASS(NO TEMPERED)
Bending glass is a curved glass made by heating and softening flat glass to form in a mold and then annealed. Hot bending glass is generally processed in an electric furnace. Continuous hot bending furnaces generally have 5-6 chambers, 11-13 stations, and a finished product can be produced in about tens of minutes. Intermittent hot bending furnace generally has only one chamber. The temperature forming and annealing are completed in one room. The processing cycle takes several hours to one or twenty hours. It is suitable for making small batches of extra large hot bending glass.
Product Name: Curved Glass
Specifications and sizes: Produce various specifications according to the drawings provided by customers.
Material: float glass, LOW-E glass, etc.
Silk screen color: custom color, black, silver, gray, etc.
Process requirements: According to the CAD, CDR and other documents provided by customers, it can be used for opening, edging, and other processes.
Deep-bent glass products are usually bent on both sides when firing, and the direction of production of the shallow-bent glass is opposite. Deep-bend products with a angle of more than 180 °C or more must be fired by reverse molding.
The production of right-angled molds is very simple, as long as the square tube or angle iron is welded to a rectangular parallelepiped frame. However, the flatness and parallelism of the mold should be special when welding. On both sides of the mold (ie, the glass is bent Two sides) should be equipped with positioning devices to avoid too much over-molding of the glass. Not a right-angled product, resulting in scrap.
The mold making of special shape hot bending products should pay special attention to the smoothness of the arc position. Only when the mold and the template are completely matched, can the qualified product be produced.
There are many special-shaped hot-bending products, some need to use external force and local temperature heating to form. Some do not need to use external force. For some special hot-bending products, special hot bending furnace should also be used to produce. Such as bullets, U-arc, table, washbasin and other products.
Some small hot-bend lighting, watch glass, fruit bowls, etc. generally use stainless steel to make the mold. In the firing, it should also be sprayed with insulation powder for isolation. Minimize the pitting caused by excessive temperature.
6. Annealing problem of special hot bending glass
Many people make special hot-bending glass, such as semi-solid, full-circle, right-angled Z-bend, S-bend, etc., all of which will encounter the problem that the fryer or product will automatically burst after many days of molding. This is mainly because the stress is not completely eliminated. The self-explosion phenomenon caused by insufficient annealing. The main reason why many products burst when they are formed in the furnace is that the temperature drops too fast. Secondly, there are some problems in the glass itself.
To solve the problem of cracking, first of all, the furnace temperature cannot be lowered too quickly after the glass is formed. At the same time, it should also be considered to use high-quality float glass. This can reduce the self-explosion of the glass. If necessary, the product can be secondarily annealed. In order to completely eliminate the stress of the glass and ensure the quality of the product.