I. Minor Damage: The interior wall of the mounting holes exhibits localised scratches and metal adhesion burrs. Simple grinding is adequate for repair.
The locating rings can be replaced to restore minor coaxiality deviations that are the result of slight wear on the mating surfaces.
The core structure of the mould is not impacted by this form of damage, and the cost of repair is typically in the hundreds of yuan range.
II. Moderate Damage: The template experiences localised deformation and out-of-tolerance roundness of the mounting apertures as a result of uneven thermal expansion forces. Repair necessitates re-boring and re-insertion.
Microcracks are observed in the mould core as a result of localised compression. Argon arc welding and stress relief are necessary to prevent the further propagation of the fracture.
The precision of mould formation is compromised by this type of damage. Repair expenses are typically in the thousands of yuan range, necessitating a repair period of 2-3 days.
III. Severe Damage: The core forming components of the mould are rendered wholly unusable as a result of the direct crushing of the mould core by rigid compression. It is necessary to have a mould core that is custom-made.
A complete failure of the dividing surface fit, large-area deformation of the template, and irreversible damage to the structural accuracy of the entire mould.
In severe cases, this type of damage can result in the complete mould being rendered unusable, repair costs exceeding 50,000 yuan, and prolonged production line downtime.
The design phase should incorporate sufficient thermal expansion clearances, and clearance verification should be performed during installation to prevent the occurrence of these mould damage issues.
