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What are the reasons for the leakage of the hydraulic system of the injection molding machine?
1 Design Factors
Choice of seals
The reliability of the hydraulic system depends to a large extent on the design of the hydraulic system seal and the selection of the seals. Due to the unreasonable selection of the sealing structure in the design, the selection of the seals does not meet the specifications, and the hydraulic oil and the hydraulic oil are not considered in the design. Compatible types of sealing materials, load conditions, ultimate pressure, working speed, changes in ambient temperature, etc.
These all cause hydraulic system leakage directly or indirectly to varying degrees. In addition, due to the dust and impurities in the operating environment of the injection molding machine, appropriate dust seals should be selected in the design to prevent dust and other contaminants from entering the system to damage the seal and contaminate the oil, resulting in leakage.
2 Manufacturing and Assembly Factors
Manufacturing factor:
All hydraulic components and sealing components have strict dimensional tolerances, surface treatment, surface finish and geometric tolerances. If it is out of tolerance during the manufacturing process, for example: the piston radius of the cylinder, the depth or width of the sealing groove, the hole size of the sealing ring is out of tolerance or out of round due to machining problems, there are burrs or depressions, chrome plating falls off, etc., the seal The parts will be deformed, scratched, crushed or not compacted, which will cause them to lose their sealing function. The parts themselves will have congenital leak points, which will leak after assembly or during use.
Assembly factors:
In the assembly of hydraulic components, brutal operation should be avoided. Excessive force will cause deformation of the parts, especially the use of copper rods to beat the cylinder body and sealing flanges. The parts should be carefully checked before assembly. When assembling, the parts should be dipped in a little hydraulic oil and pressed in gently. When cleaning, use diesel oil, especially rubber components such as sealing rings, dust rings, and O-rings. If gasoline is used, make them It is easy to age and lose its original elasticity, thereby losing its sealing function.
3 Part damage
The seal is made of oil-resistant rubber and other materials. Due to long-term use, aging, cracking, and damage will cause system leakage. If the part is damaged by impact during operation, it will scratch the sealing element and cause leakage.
Choice of seals
The reliability of the hydraulic system depends to a large extent on the design of the hydraulic system seal and the selection of the seals. Due to the unreasonable selection of the sealing structure in the design, the selection of the seals does not meet the specifications, and the hydraulic oil and the hydraulic oil are not considered in the design. Compatible types of sealing materials, load conditions, ultimate pressure, working speed, changes in ambient temperature, etc.
These all cause hydraulic system leakage directly or indirectly to varying degrees. In addition, due to the dust and impurities in the operating environment of the injection molding machine, appropriate dust seals should be selected in the design to prevent dust and other contaminants from entering the system to damage the seal and contaminate the oil, resulting in leakage.
2 Manufacturing and Assembly Factors
Manufacturing factor:
All hydraulic components and sealing components have strict dimensional tolerances, surface treatment, surface finish and geometric tolerances. If it is out of tolerance during the manufacturing process, for example: the piston radius of the cylinder, the depth or width of the sealing groove, the hole size of the sealing ring is out of tolerance or out of round due to machining problems, there are burrs or depressions, chrome plating falls off, etc., the seal The parts will be deformed, scratched, crushed or not compacted, which will cause them to lose their sealing function. The parts themselves will have congenital leak points, which will leak after assembly or during use.
Assembly factors:
In the assembly of hydraulic components, brutal operation should be avoided. Excessive force will cause deformation of the parts, especially the use of copper rods to beat the cylinder body and sealing flanges. The parts should be carefully checked before assembly. When assembling, the parts should be dipped in a little hydraulic oil and pressed in gently. When cleaning, use diesel oil, especially rubber components such as sealing rings, dust rings, and O-rings. If gasoline is used, make them It is easy to age and lose its original elasticity, thereby losing its sealing function.
3 Part damage
The seal is made of oil-resistant rubber and other materials. Due to long-term use, aging, cracking, and damage will cause system leakage. If the part is damaged by impact during operation, it will scratch the sealing element and cause leakage.
