Laser Piercing Pulse Control for Thick Workpiece Breakthrough
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Solution Overview
Problem
Current laser piercing methods face challenges in efficiently piercing thicker materials, leading to longer breakthrough times and increased risk of piercing stops, especially with sheet thicknesses greater than 10 mm or 20 mm, due to difficulties in maintaining a stable piercing rate.
Innovation Solution
A method and device that control the energy input of a pulsed laser beam by adjusting mean pulse power, pulse off-time, and pulse frequency based on material thickness, current piercing time, and other parameters to optimize the piercing process, reducing energy input during breakthrough to prevent piercing stops and maximize piercing rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pulse frequency or mean laser power is increased to minimize piercing duration, then the piercing rate improves, but the risk of piercing stop increases for thicker materials
Solution Approach 1:
The patent applies dynamics by making the pulse frequency and mean laser power variable during the piercing process. The control device dynamically adjusts these parameters based on real-time feedback from the sensor, transitioning from higher values at the beginning of piercing to lower values as breakthrough is approached, thereby maintaining high productivity while preventing piercing stops
Solution Approach 2:
The patent implements feedback by using a sensor to detect the piercing state and providing this information to a control device. The control device uses this feedback to automatically adjust the pulse frequency and mean laser power, ensuring that the piercing process remains stable and reliable while maintaining high piercing rates
2Speed
If higher laser power is used to pierce thicker materials, then the piercing speed increases, but the piercing duration increases and piercing stops occur more frequently
Solution Approach 1:
The patent applies periodic action by using pulsed laser radiation with variable pulse frequencies. The pulse frequency is adjusted periodically during the piercing process - higher at the beginning to achieve fast initial piercing, then reduced as breakthrough is approached to minimize total duration and prevent piercing stops
Solution Approach 2:
The patent implements parameter changes by varying the pulse frequency and mean laser power during the piercing process. The control device adjusts these parameters based on detected piercing depth and material thickness, optimizing both piercing speed and total duration while preventing piercing stops
3Loss of time
If the pulse frequency is increased to reduce breakthrough time, then the piercing efficiency improves, but the energy input becomes uncontrolled and causes piercing stops
Solution Approach 1:
The patent uses feedback control to monitor the piercing process and automatically adjust pulse frequency and mean laser power. This prevents uncontrolled energy input while maintaining high piercing efficiency, as the control device reduces parameters when breakthrough is detected, avoiding piercing stops
Solution Approach 2:
The patent applies dynamics by making the energy input parameters (pulse frequency and mean laser power) variable rather than constant. The parameters are dynamically adjusted during piercing based on real-time feedback, optimizing breakthrough time while preventing energy-related piercing stops
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 significantly reduces breakthrough time, ensures reliable piercing, and prevents piercing stops by dynamically adjusting laser pulse parameters, enhancing process efficiency and effectiveness for thicker workpieces.
Implementation Method 1
radiating a pulsed laser beam onto a workpiece to form a piercing breakthrough
Implementation Method 2
The laser beam emerging from a laser light source is focused or collimated on the workpiece to be machined
Implementation Method 3
an initial hole or puncture which serves as the starting point for the cutting process is created in the workpiece
Data Source
AI summary
A method for piercing a workpiece by means of a laser beam includes radiating a pulsed laser beam onto a workpiece to form a piercing breakthrough, wherein a radiated mean pulse power (Pmittel) of the pulsed laser beam is reduced during piercing.