Integrated Laser Material Processing Cell for Simultaneous Deposition and Milling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current laser-assisted machining and directed material deposition techniques lack the capability to achieve high geometric accuracy and surface finish simultaneously, especially when processing difficult-to-machine materials like ceramics, high-temperature alloys, and composites.
Innovation Solution
An integrated material processing cell that combines multi-axis laser-assisted machining with directed material deposition, utilizing a primary and secondary laser emitter and a side-feed powder delivery nozzle to perform both processes in a single setup, allowing for simultaneous material deposition and machining with precise control over laser positioning and material temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If directed material deposition is used to fabricate freeform parts from powdered material, then build rate is maximized, but geometric accuracy and surface finish deteriorate
Solution Approach 1:
The manufacturing process is segmented into two distinct operations: directed material deposition for bulk material addition, and laser-assisted machining for precision surface finishing. This segmentation allows each process to optimize for its specific function, achieving both high build rates and high geometric accuracy that cannot be achieved by either process alone
Solution Approach 2:
The patent combines directed material deposition and laser-assisted machining into a single integrated system with coordinated motion control. The machining head with laser emitter and cutting tool is integrated into the deposition system, allowing seamless transition between deposition and machining operations on the same workpiece without repositioning
2Productivity
If conventional cutting tools are used to machine difficult-to-machine materials, then material removal is achieved, but tool life decreases and cutting forces increase
Solution Approach 1:
The laser emitter changes the thermal parameters of the workpiece material by locally heating it to elevated temperatures before machining. This parameter change softens the material, reducing its hardness and strength, which allows conventional cutting tools to remove material more easily with lower cutting forces and extended tool life
Solution Approach 2:
The laser heating is applied as a preliminary action before the cutting tool engages the material. By pre-heating and softening the material in the cutting zone, the material becomes more machinable, allowing the cutting tool to operate under more favorable conditions with reduced stress and extended durability
3Manufacturing precision
If laser-assisted machining is used to soften material prior to cutting, then surface finish improves, but process complexity increases
Solution Approach 1:
The system employs a universal multi-axis controller that manages both the directed material deposition nozzle and the laser-assisted machining head. This multi-functional control system coordinates both processes through a single control architecture, reducing operational complexity despite the advanced capabilities provided
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 integrated approach enhances geometric accuracy and surface finish of processed parts, enabling the efficient fabrication of complex freeform structures from difficult-to-machine materials with improved build rates and material removal capabilities.
Implementation Method 1
Each layer of a part is formed by the laser beam and material deposition nozzle making a number of passes over a substrate and thereby depositing an amount of powdered material which is subsequently melted and solidified into a single piece with heat from the laser beam
Implementation Method 2
The solidified layer adjacent the cutting tool is heated with heat from a laser beam emitted from the secondary laser emitter to a temperature that facilitates material removal with the cutting tool
Data Source
AI summary
An integrated laser material processing cell allowing laser-assisted machining to be used in conjunction with directed material deposition in a single setup, achieving greater geometric accuracy and better surface finish than currently possible in existing laser freeform fabrication techniques. The integration of these two processes takes advantage of their common use of laser beam heat to process materials. The cell involves a multi-axis laser-assisted milling machine having a work spindle, a laser emitter, and means for positioning the emitter with respect to the spindle so as to direct a laser beam onto a localized area of a work piece in proximity to a cutting tool mounted in the spindle. A powder delivery nozzle mounted on the machine and positioned adjacent to the emitter delivers powder to a deposition zone in the path of the beam, such that material deposition and laser-assisted milling may be performed substantially simultaneously in a single workspace.