Method for adjusting bending degree of large-specification glass

Abstract

The invention relates to a method for adjusting the bending degree of large-specification glass, and relates to the technical field of laminated glass production. The method comprises the following steps: S1, planning a three-dimensional curved surface; s11, importing a three-dimensional model of the laminated glass, and generating a laser path based on the three-dimensional model of the laminated glass; s12, an infrared laser scanning path: a laser beam moves back and forth according to a zigzag track to cover a target area; s13, ultraviolet laser composite path: based on the three-dimensional model of the laminated glass, generating an offset contour line, and performing equidistant offset on the appearance of the glass to ensure that the edge is covered; the laminated glass is layered by adopting contour lines, and parallel tracks are filled between offset paths, so that the surface precision is improved; s2, infrared pre-bending is carried out; s3, performing ultraviolet plasma fine trimming; s4, carrying out regional parallel processing; s5, online quality control; and S6, low-temperature annealing. The glass bending adjusting device has the effects that the flexibility and expandability of glass bending adjusting are improved, and the glass processing requirements of different sizes and thicknesses are easily met.

Description

Technical Field

[0001] The present application relates to the technical field of laminated glass production, and in particular to a method for adjusting the curvature of large-sized glass. Background Art

[0002] Laminated glass is a type of safety glass made by combining two or more pieces of glass with one or more layers of organic polymer interlayers, such as PVB, SGP, and EVA, through a high-temperature and high-pressure process. It combines the transparency of glass with the toughness of the interlayer, and excels in safety, sound insulation, and UV laser protection. It is widely used in construction, automotive, security, and other fields.

[0003] In order to ensure uniform stress distribution of laminated glass, avoid structural failure and breakage risks, and optimize optical and acoustic performance, it is usually necessary to adjust the curvature of laminated glass during its production process. In the process of producing large-sized laminated glass, due to the large size and complex structure of the glass, the requirements for the curved surface are high. The existing zoned temperature control and mechanical correction methods are often difficult to meet the high-precision requirements. Therefore, this application proposes a glass curvature adjustment method based on dual-band laser energy coupling. Summary of the Invention

[0004] In order to improve the flexibility and scalability of glass curvature adjustment and easily adapt to the processing requirements of glass of different sizes and thicknesses, the present application provides a method for adjusting the curvature of large-sized glass.

[0005] The present application provides a method for adjusting the curvature of large-sized glass using the following technical solutions: A method for adjusting the curvature of large-sized glass comprises the following steps: S1: 3D surface planning; S11: Import the 3D model of laminated glass and generate the laser path based on the 3D model of laminated glass; S12: Infrared laser scanning path: The laser beam moves back and forth along a zigzag trajectory, covering the target area; S13: UV laser composite path: Based on the 3D model of laminated glass, offset contour lines are generated and the glass shape is offset at equal distances to ensure edge coverage. Contour lines are used to layer the laminated glass and parallel tracks are filled between the offset paths to improve surface accuracy. S2: Infrared pre-bending: Irradiate the glass surface with infrared laser at an angle perpendicular to the glass surface; S3: UV plasma finishing: irradiate the glass surface with UV laser at a perpendicular angle to the glass surface; S4: Parallel processing by region: The laminated glass surface is partitioned based on a dynamic grid algorithm, and multi-laser head collaborative logic is used to heat the laminated glass surface partitions; S5: Online quality control; S6: low temperature annealing.

[0006] Preferably, the equidistant offsetting of the glass shape further comprises: the offset spacing is 50%-80% of the laser spot diameter; and the filling of parallel tracks between the offset paths further comprises: the line spacing of the parallel tracks is ≤0.1 mm.

[0007] Preferably, the step S2 further comprises: the infrared laser has an action depth of 0.8-1.2 mm and a power density of 30 W / cm 2 , the scanning speed is 500mm / s and the defocus is +2mm.

[0008] Preferably, the step S3 further comprises: the action depth of the ultraviolet laser is 0.01-0.05 mm, and the pulse overlap rate is 60%.

[0009] Preferably, the step S5 further includes: S51: Plasma spectrum analysis: Detect the Fe and Si ion emission lines on the glass surface and invert the removal depth; S52: Interferometer real-time feedback: Compare the actual curvature with the target value every 10 seconds, and trigger a compensation scan if the error exceeds the limit.

[0010] Preferably, the step S6 further comprises: performing residual stress elimination at a standard of 250° C. / 2 h, and controlling the heating rate to be ≤3° C. / min.

[0011] In summary, this application includes at least one of the following beneficial technical effects: 1. This application combines infrared-driven macro-deformation and ultraviolet plasma micro-shaping technology to effectively solve the problems of precision, efficiency and damage in the forming process of large-scale glass curved surfaces; 2. The technical solution of this application is highly flexible and scalable, and can easily adapt to the processing needs of glass of different sizes and thicknesses, providing high-quality glass material solutions for multiple fields such as rail transit, building curtain walls, photovoltaic substrates, and electronic display glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a flow chart of a method for adjusting the curvature of large-format glass according to an embodiment of the present application. DETAILED DESCRIPTION

[0013] The following is combined with Figure 1 This application is described in further detail.

[0014] The embodiment of the present application discloses a method for adjusting the curvature of large-sized glass. Figure 1 , including the following steps: S1: 3D surface planning; S11: Import the 3D model of laminated glass and generate the laser path based on the 3D model of laminated glass; S12: Infrared laser scanning path: The laser beam moves back and forth along a zigzag trajectory, covering the target area; During the implementation process, the infrared laser is generated by an infrared fiber laser and performs Zigzag path scanning. Its power is continuously adjustable from 0 to 600W to drive the basic deformation of the glass.

[0015] S13: UV laser composite path: Based on the 3D model of laminated glass, offset contour lines are generated and the glass shape is offset at equal distances to ensure edge coverage. Contour lines are used to layer the laminated glass and parallel tracks are filled between the offset paths to improve surface accuracy. During the implementation process, the ultraviolet laser is generated by an ultraviolet DPSS laser with a pulse width of 10ns, a single pulse energy of 2mJ, and a spot diameter of 10μm; the offset spacing is 50%-80% of the laser spot diameter, and the line spacing of the parallel tracks is ≤0.1mm.

[0016] S2: Infrared pre-bending: Irradiate the glass surface with infrared laser at an angle perpendicular to the glass surface; During the implementation process, the infrared laser has an action depth of 0.8-1.2 mm and a power density of 30 W / cm 2 , the scanning speed is 500mm / s and the defocus is +2mm.

[0017] S3: UV plasma finishing: irradiate the glass surface with UV laser at a perpendicular angle to the glass surface; During the implementation process, the action depth of the ultraviolet laser was 0.01-0.05mm, and the pulse overlap rate was 60%.

[0018] In this embodiment, the wavelength of the infrared laser is 1064nm, which is mainly responsible for adjusting the macroscopic bending shape of the glass. The wavelength of the ultraviolet laser is 355nm, which is mainly responsible for fine-tuning the shock wave to fine-tune the deformation. The overlap rate of the laser pulses of the two reaches 60% to effectively avoid the heat accumulation effect.

[0019] In this embodiment, an infrared-ultraviolet dual-band energy synergy equation is constructed to achieve precise control of the deformation variable, where: Energy Model Infrared: E IR =k1⋅ΔT⋅V, V is the action volume; Energy Model UV: E UV =k²⋅(P / d)², P is the power, d is the spot diameter; Synergistic effect formula: Δk = α⋅E IR / h⋅e^(-βh)+γ⋅E UV / d², Δk is the curvature change, α, β, γ are material constants. Taking soda-lime glass as an example: α=0.17, β=1.8, γ=0.02, h is the glass thickness (mm), and d is the diameter of the UV spot (mm).

[0020] During the implementation process, it is also necessary to control the energy density threshold of infrared laser and ultraviolet laser so that the system stops when the control exceeds the safe energy. The energy density calculation formula is: E=4P / πdvf, the unit is J / cm 2 , where P is the laser power (W), d is the spot diameter (mm), v is the scanning speed (mm / s), f is the pulse frequency (Hz, 1 for continuous wave); in this embodiment, the safety threshold of infrared laser is set to 32J / cm2, within which processing is allowed, and the safety threshold of ultraviolet laser is set to 9.0J / cm 2 , when this value is exceeded, the load is reduced to 7.6J / cm 2 .

[0021] S4: Parallel processing by region: The laminated glass surface is partitioned based on a dynamic grid algorithm, and multi-laser head collaborative logic is used to heat the laminated glass surface partitions; During the implementation process, a coaxial galvanometer system is used for dual-beam synchronous focusing, with a scanning speed of 0-1000mm / s and a positioning accuracy of ±1μm; a real-time temperature measurement module is used during the partitioned heating process to prevent heat accumulation, such as an infrared thermal imager with a frame rate of 100Hz and an accuracy of ±0.5℃.

[0022] S5: Online quality control; S51: Plasma spectrum analysis: Detect the Fe and Si ion emission lines on the glass surface and invert the removal depth; During implementation, plasma closed-loop control utilizes spectral characteristics to regulate UV pulses in real time, effectively preventing thermal damage. The specific regulation rules are as follows: (1) Ablation depth control Rule: When the intensity of the characteristic line FeI is Fe >5000 counts; Action: UV pulse energy is adjusted down, with a step accuracy of 0.1mJ; (2) Thermal damage inhibition Rule: If the intensity of the characteristic line SiI increases by more than 30% within 2 seconds; Action: Pause UV pulse emission and trigger air cooling, the wind speed of air cooling is 20m / s; Recovery condition: SiI intensity drops to ±10% of the baseline.

[0023] S52: Interferometer real-time feedback: Compare the actual curvature with the target value every 10 seconds, and trigger a compensation scan if the error exceeds the limit.

[0024] S6: low temperature annealing; During the implementation process, residual stress was eliminated at a standard of 250°C / 2h, and the heating rate was controlled to be ≤3°C / min.

[0025] The implementation principle of a large-scale glass curvature adjustment method in an embodiment of the present application is as follows: the present application combines infrared-driven macro-deformation and ultraviolet plasma onlooker shaping technology to effectively solve the problems of accuracy, efficiency and damage in the large-scale glass curved surface forming process, and has been significantly improved compared with the existing technology. Infrared preheating and ultraviolet pulses are staggered, and the overall temperature is less than 300°C, which can effectively improve the phenomenon of thermal cracks on the glass edge. The use of plasma shock waves can ensure the surface roughness of the glass and improve the problem of insufficient surface smoothness in the existing technology. The technical means of regional parallel processing are used to improve the problem of low efficiency of large-size glass.

[0026] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for adjusting the curvature of large-sized glass, characterized in that: The steps include: S1: 3D surface planning; S11: Import the 3D model of laminated glass and generate the laser path based on the 3D model of laminated glass; S12: Infrared laser scanning path: The laser beam moves back and forth along a zigzag trajectory, covering the target area; S13: UV laser composite path: Based on the three-dimensional model of laminated glass, an offset contour line is generated, and the glass shape is offset at equal distances to ensure edge coverage; Use contour lines to layer laminated glass and fill parallel tracks between offset paths to improve surface accuracy; S2: Infrared pre-bending: Irradiate the glass surface with infrared laser at an angle perpendicular to the glass surface; S3: UV plasma finishing: irradiate the glass surface with UV laser at a perpendicular angle to the glass surface; S4: Parallel processing by region: The laminated glass surface is partitioned based on a dynamic grid algorithm, and multi-laser head collaborative logic is used to heat the laminated glass surface partitions; S5: Online quality control; S6: low temperature annealing.

2. The method for adjusting the curvature of large-sized glass according to claim 1, characterized in that: The equidistant offsetting of the glass shape further includes: the offset spacing is 50%-80% of the laser spot diameter; the filling of parallel tracks between the offset paths further includes: the line spacing of the parallel tracks is ≤0.1mm.

3. The method for adjusting the curvature of large-sized glass according to claim 1, characterized in that: The step S2 also includes: the infrared laser has an action depth of 0.8-1.2 mm and a power density of 30 W / cm 2 , the scanning speed is 500mm / s and the defocus is +2mm.

4. The method for adjusting the curvature of large-format glass according to claim 1, characterized in that: The step S3 also includes: the action depth of the ultraviolet laser is 0.01-0.05 mm, and the pulse overlap rate is 60%.

5. The method for adjusting the curvature of large-sized glass according to claim 1, characterized in that: The step S5 further includes: S51: Plasma spectrum analysis: Detect the Fe and Si ion emission lines on the glass surface and invert the removal depth; S52: Interferometer real-time feedback: Compare the actual curvature with the target value every 10 seconds, and trigger a compensation scan if the error exceeds the limit.

6. The method for adjusting the curvature of large-sized glass according to claim 1, characterized in that: The step S6 further includes: performing residual stress elimination at a standard of 250° C. / 2 h, and controlling the heating rate to be ≤3° C. / min.

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