The processing difficulty of high-precision curved tempered glass is mainly reflected in aspects such as controlling the curvature accuracy, ensuring the uniformity of glass thickness, high production technology thresholds, and complex post-production inspection.
Processing difficulties
High radian accuracy is required
High-difficulty curved tempered glass requires precise bending while maintaining high strength, with the curvature deviation typically controlled within ≤2mm. If the bending is inaccurate, it can lead to poor fit with the frame during installation, resulting in gaps or stress concentration, which affects the overall structural safety.
It is difficult to ensure the uniformity of glass thickness
During the hot bending process, the glass is in a softened state at high temperatures (approximately 550–650°C). If the process is not properly controlled, it is easy to cause the middle part to be too thin or too thick. This not only affects the service life, but also may lead to spontaneous breakage or damage due to local stress imbalance during use.
The tempering and hot bending processes require coordinated control
The curved glass must first undergo hot bending and shaping before being tempered. However, rapid cooling during the tempering process can introduce new internal stresses. If these stresses are not properly superimposed with the bending stress, it can easily lead to ripple deformation, optical distortion, and even cracking.
High dependence on molds and equipment
Hot bending requires the use of high-precision molds, and different molds need to be customized for different curvatures. The surface quality of the mold directly affects the optical performance of the finished glass product. Defects such as pitting and mold marks can affect the visual effect.