Laser Ablation Cutting of Ceramic Materials Without Heat Deformation
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Solution Overview
Problem
Cutting hard ceramic materials like zirconia for dental prostheses is time-consuming and results in deformation and property changes due to conventional cutting methods, leading to rough surfaces.
Innovation Solution
A processing method using short-pulse laser ablation with non-contact laser light irradiation, where the material is cut based on pre-defined three-dimensional data created by CAD/CAM systems, allowing precise cutting without heat-induced deformation by forming cavities along predetermined line segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cutting methods are used on hard ceramic materials, then the material can be cut off, but the processing time increases significantly
Solution Approach 1:
The patent replaces the mechanical cutting system with a laser-based processing system. The laser beam irradiates the ceramic material to induce microcracks and modify the material structure, enabling separation without mechanical contact. This substitution eliminates the limitations of mechanical cutting tools when processing hard, brittle materials like fully sintered zirconia, achieving both reduced processing time and improved cut surface quality.
Solution Approach 2:
The patent changes the processing parameters by using laser irradiation to alter the physical and chemical state of the ceramic material. The laser energy modifies the material properties through heating and phase changes, creating a different cutting mechanism that is more suitable for hard ceramics. This parameter change enables efficient processing while maintaining material integrity and reducing processing time.
2Productivity
If heating is applied to cut the material, then cutting speed increases, but the material properties change and deformation occurs
Solution Approach 1:
The patent employs periodic laser irradiation with controlled pulse duration and intervals. The laser is applied in a rhythmic manner, allowing heat to be deposited in controlled amounts without causing excessive thermal accumulation. This periodic action enables rapid cutting while maintaining material property stability by preventing prolonged thermal exposure that would cause deformation.
Solution Approach 2:
The patent uses high-power laser irradiation to rapidly process through the material in a single pass or minimal passes. The laser energy is concentrated and delivered quickly, completing the cutting operation before significant heat diffusion can occur. This rushing through approach achieves high cutting speed while minimizing thermal damage to the surrounding material.
3Strength
If conventional cutting tools are used, then the cut can be made, but the cutting tool load increases and movement speed must be reduced
Solution Approach 1:
The patent replaces the mechanical cutting tool with a laser beam, eliminating the physical tool that would be subjected to load. The laser delivers energy without mechanical contact, removing the constraint of tool strength limitations and enabling continuous operation at optimal speeds without concern for tool wear or breakage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables efficient cutting of ceramic materials, reducing processing time and maintaining material properties, resulting in precise and smooth cut surfaces.
Implementation Method 1
A processing method using short-pulse laser ablation with non-contact laser light irradiation, where the material is cut based on pre-defined three-dimensional data created by CAD/CAM systems
Data Source
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AI summary
Provided is a processing method that allows unnecessary portions of a material (M) to be cut off in a short time without being affected by deformation and changing of the properties of the material (M), and a processing system (100) for implementing the processing method. The processing method includes the following steps : irradiating a light-transmittable material (M) with laser light to perform ablation to cut off an unnecessary portion of the material (M), in which a cut part is formed in the material (M) by radiating the laser light along an irradiated part based on a first line segment set in a predetermined direction.