In the die design of construction machinery forgings, die coating technology is widely used to improve the wear resistance, anti-viscosity and prolong the life of the die. The following will introduce some common types of die coating technology for construction machinery forgings and the evaluation method of the effect.
Common construction machinery forging die coating technologies include:
- Hard coating: Hard coating usually adopts chemical vapor deposition or physical vapor deposition technology, such as tungsten carbide, titanium nitride, aluminum nitride, etc. The hard coating has excellent hardness and wear resistance, which can effectively resist the wear and scratches on the mold surface and extend the service life of the mold.
- Anti-stick coating: Anti-stick coating usually uses coating, spraying or sputtering technology, such as molybdenum coating, molybdenum silicon coating and so on. The anti-stick coating can reduce the adhesive friction between the die and the forging, avoid the forging sticking to the die, and improve production efficiency and product quality.
- Alumina coating: Alumina coating can provide high temperature oxidation resistance and corrosion resistance of the mold surface, reduce the oxidation reaction of the mold and high temperature environment, and increase the service life of the mold.
- Hydrophobic coating: Hydrophobic coating usually uses special surface treatment technology, such as nanostructure coating, low-energy adhesion coating, etc. The hydrophobic coating can make the mold surface show better moisture-proof, anti-corrosion and anti-pollution properties.
Effectiveness evaluation methods mainly include the following aspects:
- Wear resistance evaluation: Evaluate the wear resistance of die coating through friction and wear test or actual production use. Common evaluation indicators include wear, friction coefficient and surface quality.
- Anti-viscosity evaluation: Through the contact test between the mold and the forging or the use of the actual production, the anti-viscosity of the mold coating is evaluated. The evaluation index can include forging release force, die surface adhesion degree, etc.
- Life assessment: Evaluate the service life of the mold coating through long-term production use or simulated life test. It can be evaluated based on the performance changes, surface morphology and functional degradation of the die coating.
- Forming quality assessment: Through comparative analysis of the forgings produced by coated and untreated molds, the influence of coating on forming quality is assessed. The dimensional accuracy, surface quality and defects of forgings can be investigated.
In summary, die coating technology of construction machinery forgings has a good effect on improving die life, reducing friction and wear and improving forming quality. Evaluating the effect of coating technology usually requires a comprehensive evaluation combined with experimental testing and practical application to determine the most suitable mold coating technology and optimal design scheme.
