In life, we often use all kinds of glass products, such as glass Windows, glasses, glass sliding doors and so on. Glass products are both beautiful and practical, which can be loved by virtue of its crystal clear appearance, and can make full use of its hard and durable physical properties. Some art glass will even make the glass have more pattern, enhance the decorative effect. In this article, we will introduce why glass tube processing needs annealing, and how to connect glass tube and rubber tube.
First, why do glass tube processing need annealing
The purpose is to clean up the better stress and structural imbalance in glass products.
Glass is a poor thermal conductivity, after the product is formed, the surface layer and the inner layer in the cooling process temperature difference, when the surface solidified, the inner layer viscous, the temperature difference exists and the stress relaxation does not exist, this temperature difference in the surface layer cooling to room temperature, the inner layer continues to cool down and shrink, hindered by the surface layer to produce tensile stress, while the surface layer produces compressive stress, the better existence. The size and distribution of the better stress caused by the thermal process in each part of the product will not be uniform, therefore, it will affect the strength of the glass product, and even break itself due to stress concentration.
Annealing can clean the harmful tension inside the glass and prevent the formation of new stress. When annealing, the glass products are heated or maintained to the annealing temperature after thermoforming, so that the original stress is relaxed and cleaned, and then slowly cooled to the strain temperature below, after the glass fully enters the rigid state, the temperature difference between the inner and outer layers only produces temporary stress. Due to some properties and functions of the glass (such as optical glass, thermometer glass) in the transition temperature range, the huge viscosity makes the structural particle move slowly, resulting in its performance too late to achieve a consistent state of equilibrium with the temperature, the use of slow balance will produce performance changes, therefore, it must be maintained at the annealing temperature for enough time.
Second, how to connect the glass tube and rubber tube
In the experiment, the method of connecting the glass tube and the rubber tube is: lubricating with water.
Lift the corner of the rubber tube mouth, carefully squeeze the corner of the glass tube mouth into the corner raised by the rubber tube, and then press it with your finger to prevent it from shrinking, and then from the side according to the same method, little by little insert the glass tube into the rubber tube. Under normal circumstances are applicable, unless the diameter of the glass tube is much larger than the diameter of the hose, otherwise it should be very, pay attention to the whole process to be lubricated with water.
When the glass tube and the rubber tube are connected, the glass tube is first dipped in water to reduce the friction by reducing the roughness of the contact surface under a certain pressure.
Related concept
Glass tube
Glass tube is a kind of non-metallic tube, which is a kind of glass with sodium oxide (Na2O), boron oxide (B2O2) and silicon dioxide (SIO2) as the basic components. Its good performance has been widely recognized by all walks of life in the world, compared with the general glass, harmless side effects, its mechanical properties, thermal stability, water resistance, alkali resistance, acid resistance and other properties are greatly improved, can be widely used in chemical industry, aerospace, military, family, hospital and other fields, with good promotion value and social benefits. The appearance of this kind of glass in our country is another new revolution in the basic material industry.