Ceramic Blind Opening Machining with Laser-Mechanical Finishing
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Solution Overview
Problem
Existing methods for machining features like blind holes and slots in ceramic matrix composite (CMC) materials face challenges such as poor surface integrity, high tool wear, and low productivity.
Innovation Solution
A method involving a combination of laser machining and mechanical machining, where laser machining removes the bulk of the material and mechanical machining, such as grinding or milling, finishes the remaining material to achieve the desired feature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If deep, small-diameter holes are drilled in CMCs using conventional methods, then material removal is achieved, but surface integrity deteriorates, tool wear increases, and productivity decreases
Solution Approach 1:
The machining process is segmented into two distinct operations: laser machining for bulk material removal and mechanical machining for final finishing. This segmentation allows each process to optimize for its specific function, with laser removing the majority of material quickly and mechanical machining providing precise surface finish, thereby resolving the contradiction between productivity and surface integrity
Solution Approach 2:
The patent replaces conventional mechanical drilling with laser machining for the bulk material removal step. Laser machining eliminates mechanical contact, thereby avoiding tool wear and the poor surface integrity associated with mechanical drilling, while simultaneously increasing material removal rate
2Productivity
If conventional mechanical machining is used on CMCs, then material removal is achieved, but tool wear increases and surface integrity deteriorates
Solution Approach 1:
Laser machining replaces mechanical drilling for bulk material removal, eliminating tool wear entirely since laser is a non-contact process. This substitution maintains high productivity while dramatically improving tool life (effectively infinite for the laser system)
Solution Approach 2:
The patent changes the machining parameter from mechanical force to laser energy. This parameter change allows material removal without mechanical contact, eliminating tool wear while maintaining efficient material removal rates
3Productivity
If laser machining is used for bulk material removal, then productivity increases, but complete material removal is not achieved
Solution Approach 1:
The process is segmented into two stages: laser machining removes the bulk material (achieving high productivity) and mechanical machining removes the remaining material (achieving complete material removal). This segmentation allows each process to focus on its strength without compromising the other
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 approach allows for more efficient material removal rates and cycle times, improving the accuracy and reducing the risk of damage to the ceramic components.
Implementation Method 1
removing a bulk of the material by a laser machining operation
Implementation Method 2
the laser machining operation is water-guided laser machining
Implementation Method 3
removing a remainder of the material by a mechanical machining operation
Data Source
AI summary
A method of machining includes removing material from a target region of a ceramic component to form a blind opening in the ceramic component via removing a bulk of the material by a laser machining operation and then removing a remainder of the material by a mechanical machining operation.