What are the main factors that affect the yield of bent steel glass?

Curved steel glass has high plasticity, high strength, and safety, making it increasingly useful in industries such as automobiles, ships, and decoration.

The cracking of bent steel glass during the forming and tempering process is one of the main factors affecting the yield of bent steel glass, which greatly increases the production cost of bent steel glass.

In order to reduce the production cost of bent steel glass and make it more widely used, the following will explore some main factors that affect the yield of bent steel glass.

The main parameters of the bending and tempering process include: glass heating furnace temperature, forming speed, bending time, cooling speed, etc. These parameters are closely related.

1. Effects of heating conditions

When toughening glass, it must be evenly heated, otherwise it will cause uneven heating of various parts of the glass, resulting in temperature differences, and thus uneven stress distribution in various parts, increasing the possibility of glass cracking.

The heating temperature should not be too high, otherwise the glass softening phenomenon will be severe, causing viscous flow and deformation, directly affecting the surface quality of the glass. Generally, setting the furnace temperature to 680-700 ℃ is sufficient. Set the corresponding heating temperature and time according to the thickness of the glass and the size of the layout.

The discharge temperature of bent glass should be slightly higher, therefore, the heating time should be appropriately longer.

2. The influence of bending time, arc changing speed, and arc changing radius

Glass loses heat when it comes out of the furnace. The surface temperature of the glass is around 630 ℃, and when the room temperature is around 15 ℃, the glass temperature decreases at a rate of about 30 ℃/S. Therefore, the glass discharge speed should be appropriately increased, and the arc changing speed should be adjusted according to the thickness of the glass. The speed of (3-6mm) should be greater than (8-12mm), otherwise the glass may shatter before the arc is fully formed due to heat loss.

During the forming process, the arc changing speed of thick glass should be appropriately slow, while that of thin glass should be as fast as possible; The smaller the radius R of the arc, the faster the forming speed should be. The larger the radius R, the slower the forming speed can be.

If the bending time is too long and there is too much heat loss, the surface of the glass will become hard. During bending, the convex surface of the glass will be stretched and break.

In addition, when the furnace glass is bent, the concave surface of the glass adheres closely to the male mold. The male mold is a solid structure covered with asbestos paper, and its main form of heat exchange with glass is heat conduction. Asbestos is a good insulation material, so the concave surface of glass loses less heat through heat exchange.

The other side of the glass is the convex surface, which is in contact with the frame of the female mold. The vast majority of the surface is exposed to the air and undergoes convective heat exchange with the air, resulting in significant heat loss on the convex surface of the glass.

If the bending time is too long, the temperature difference on both sides of the glass is significant, and the stress distribution is severely asymmetric, which is very easy to cause glass cracking.

So it is necessary to control the bending time well. Generally, the bending time of 3mm~10mm glass is controlled within 2s~3s, and the bending time of 12mm and above glass is controlled within 3s~4s.

The variable arc radius should be based on the manufacturer's data requirements. If it exceeds the set range, it will also increase the probability of glass fragmentation.

3. Impact of cooling conditions

In actual production, it is generally cold

Gangxin Bending Steel Equipment:

GX-Y hard axis bending glass tempering furnace

Main use: mainly used for producing building curtain walls, interior decoration, shower rooms, and car side window glass.

Technical features: Adopting automatic arc adjustment device, easy and accurate operation; The upper wind grille adopts a friction wheel pressure roller structure, with smooth transmission.

GX-R软轴弯玻璃钢化炉

Main use: Mainly used for producing building curtain walls, various large transportation vehicle windshields, door and window glass, etc.

Technical features: Adopting automatic arc adjustment method, the operation is simple and accurate.

GX-YX Shaped Curved Glass Tempering Furnace

Main use: Mainly used for the production of multi curvature irregular curved tempered glass for buses, high-end sedan side windows, shower rooms, etc.

Technical features: Adopting segmented arc adjustment mechanism, with high fit and precise arc; The control system is stable and reliable, and the product quality is excellent.

GX-SQ Hyperboloid glass tempering furnace

Main use: mainly used for the rear window and windshield of high-end cars, home appliances, construction and decoration industries, etc.

Technical features: Adopting servo system control, stable and reliable; Mold forming under high temperature, forming accurately; The molding system adopts servo motor drive control, with precise glass positioning and good product consistency.

GX-LXY Continuous Hard Axis Bending Glass Tempering Furnace

Main use: mainly used in the production of household appliances, construction and Car glass glass.

Technical features: glass continuously enters the furnace, with extremely high production efficiency; Continuous blowing and tempering, extremely low energy consumption; Flexible operation, convenient and fast arc adjustment; The glass has good surface quality, accurate shape, consistency, and optical properties.