The heat shrinkable pipe die is designed according to the requirements of rubber products, and the metal material is transformed into die entity by mechanical processing according to the drawings. Under certain technological conditions, qualified rubber products can be produced by die. Therefore, the design of rubber mould is closely related to mechanical process and rubber production process.
On the one hand, different rubber moulds are selected according to different requirements of medium and temperature, and different rubber has different properties. Different rubber moulds have different production processes, so the requirements of production process should be fully considered in the design of moulds; on the other hand, rubber moulds are not only a kind of machined entity, but also a kind of manufacturing process. Product cost factors, so when designing the die, we should consider that the structure of the die parts meets the requirements of mechanical force mouth, and choose different structures according to the production volume of the product, so as to minimize the processing cost of the die under the premise of meeting the use requirements. Therefore, only when the designer has a comprehensive understanding of the rubber product production process, the basic structure of the rubber mold and the knowledge of mechanical processing, can he design the phase mold with reasonable structure and economic applicability.
Basic processing technology of rubber and rubber.
As an important material, rubber heat-shrinkable pipes are widely used in many fields, such as heat-shrinkable pipes, aerospace, machinery, electric vehicles and construction industry, to meet the requirements of sealing, wear resistance, oil resistance, dielectric and so on.
Rubber is a kind of macromolecule compound, its main performance characteristics are: rubber can be divided into natural rubber and rubber. Raw rubber can not be directly used in the production of rubber products. Raw rubber and various compounding agents (such as reinforcing agents, antioxidants, chemical accelerators, etc.) must be mixed evenly in the rubber mixer according to certain requirements, so that they can be used in the production of various rubber products. Mixture is a rubber product formed under certain conditions. The vulcanized rubber products have high elasticity, and the heat shrinkable tubes have excellent mechanical properties and other performance.
There are many parameters involved in the heat-shrinkable double-walled tube, such as color, shrinkage ratio, wall thickness, tensile strength and so on. Today we introduce some temperature involved in the heat-shrinkable double-walled tube.
In fact, whether it is double-walled tube or thick-walled tube, or other special double-walled tube, as long as it is double-walled tube, the temperature involved is nothing more than: shrinkage temperature, final shrinkage temperature, working temperature.
1. Shrinkage temperature of double-walled tube;
On the surface, the temperature of the double-wall heat-shrinkable tube when it begins to shrink reflects the temperature of the double-wall heat-shrinkable tube. We take the double-walled tube to start heating, heating to the temperature at which the shrinkage reaction of the double-walled tube is just beginning, and the shrinkage reaction of the PE heat-shrinkable casing begins at 84 C.
2. Final shrinkage temperature of double-walled tube;
It refers to the temperature at the end of contraction, which can make the double-walled tube reach the full contraction temperature. For example, our double-walled tube can be heated to 84 degrees. It's not like a cowhide band. I just need to hold it up to how big it is, let it go, and the cowhide band will bounce back completely and return to the original, but our heat-shrinkable tube is not like this. It won't change back to the original immediately like a cowhide band. The shape of our double-walled tube shrinkage is a gradual process. We heat the double-walled tube to 84 degrees. It just reflects the shrinkage. It can not make the double-walled tube complete shrinkage. We must continue to heat it up to the final shrinkage temperature. If it is 120 degrees, then it can make it complete shrinkage.
3. Working temperature of double-wall heat-shrinkable tube;
This temperature is an important parameter that runs through the double-walled tube. The working temperature sometimes refers to the nominal temperature and high temperature shrinkage pipe degree, which means that the casing can work normally and continuously. The first two temperatures refer to the temperature when processing the double-walled tube can shrink and reflect. We also take the 6 double-walled tube as an example, heating the double-walled tube slowly with a hot air gun, when the temperature starts to reach 84 C, double-walled tube. The wall tube begins to shrink, then slowly shrinks to 5 and 4. When the temperature reaches 120 C, the double-wall tube shrinks to 3 completely, tightly shrinks to the object, then the process of processing and heating is over. Then the part with the double-wall tube is installed on the air conditioner and so on to perform normal work. Its normal working environment, such as our casing, is normal. Normal working temperature is - 55 125 C, because we know that many times, products will be sold everywhere, some places are relatively cold, some places are relatively hot, then it has a certain scope of application, the nominal temperature of our products shows that they can be used normally at this temperature, once exceeding the normal operating temperature, it is not necessarily able to maintain. Certificate life, not necessarily able to work properly, the normal temperature we are talking about here is that double-walled tube can play an insulating protection, beyond this temperature will not necessarily play a role.