Laser Cutting Nozzle Interference for Smoother Cut Surfaces
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Solution Overview
Problem
Laser cutting apparatuses form scratches and rough cut surfaces on workpieces, particularly in the thickness direction, which is undesirable for appearance and quality.
Innovation Solution
The laser cutting apparatus emits the laser beam to interfere with the inner circumferential surface of the nozzle part, using a control unit to adjust the position of the condensing lens and nozzle, and incorporates a cooling mechanism to manage the nozzle's temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the laser is emitted without interfering with the nozzle part, then the cutting speed is maintained, but the cut surface becomes rough with scratches
Solution Approach 1:
The laser beam is intentionally made to interfere with the inner circumferential surface of the nozzle part before reaching the workpiece. This preliminary interaction modifies the laser beam characteristics (divergence, intensity distribution) in advance, preventing the formation of scratches and roughness on the cut surface without requiring slower cutting speeds
Solution Approach 2:
The inner circumferential surface of the nozzle part acts as an intermediary element that the laser beam interacts with. This intermediary surface modifies the laser properties through interference, serving as a mediation between the laser source and the workpiece to achieve smoother cut surfaces
2Manufacturing precision
If the laser interferes with the nozzle part to reduce roughness, then the cut surface quality improves, but the nozzle part overheats
Solution Approach 1:
The heating effect is extracted and separated from the laser cutting process by introducing a cooling mechanism specifically for the nozzle part. The cooling system removes the excess heat generated by laser interference with the nozzle, allowing the nozzle to maintain its structural integrity and cooling function while still enabling the beneficial laser interference for surface quality
Solution Approach 2:
The temperature parameter of the nozzle part is actively controlled by introducing cooling fluid. This parameter change (maintaining lower nozzle temperature) enables the continuous operation of laser interference with the nozzle inner surface without causing overheating, thus sustaining the surface quality improvement
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 reduces the roughness of the cut surface and maintains stable cutting by cooling the nozzle, preventing overheating and sensor malfunctions.
Implementation Method 1
the laser is emitted onto the workpiece while interfering with an inner circumferential surface of the nozzle part
Implementation Method 2
the nozzle part includes a cooling portion that causes a liquid to flow into the nozzle part
Data Source
AI summary
Disclosed is a laser cutting apparatus for laser cutting a workpiece including: a laser irradiation device having a laser beam irradiation unit for emitting a laser; a laser processing head disposed at a side of the workpiece of the laser beam irradiation unit; and a control unit, wherein the laser processing head has a nozzle part at a tip end on a side of the workpiece, and wherein the control unit performs control on at least one of the laser irradiation device and the laser processing head such that the laser is emitted onto the workpiece while interfering with an inner circumferential surface of the nozzle part.