Laser Machining Workpiece Support with Bernoulli Pads
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Solution Overview
Problem
Laser machining of metal sheets is hindered by the instability caused when assist gas ejected from a nozzle displaces the workpiece, leading to vibrations and inconsistent machining conditions, particularly at the workpiece edge, due to inadequate support mechanisms, which results in interference between the nozzle and workpiece.
Innovation Solution
A laser machining apparatus with a workpiece support unit that includes end support parts with Bernoulli pads for non-contact holding of the workpiece's width ends, allowing independent movement synchronized with the machining head, thereby maintaining stable machining conditions and preventing displacement by assist gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-pin type support means is used to support the workpiece, then the workpiece can be supported during machining, but the portion to be machined is displaced by assist gas causing vibrations and inconsistent machining conditions
Solution Approach 1:
The support function is segmented into two independent systems: a multi-pin type support means for general workpiece support and a new support means (such as a suction device or additional pins) specifically positioned to support the portion to be machined. This segmentation allows each support system to perform its specialized function without interfering with the other, preventing displacement by assist gas while maintaining overall workpiece stability.
Solution Approach 2:
Additional support is provided specifically at the local region where machining occurs, rather than relying solely on general workpiece support. The new support means is positioned to provide localized support to the portion to be machined, ensuring that this critical area remains stable despite the ejection of assist gas, thereby maintaining machining precision.
2Productivity
If machining is performed at high speed, then productivity is improved, but the portion to be machined is significantly displaced by assist gas causing nozzle and workpiece interference
Solution Approach 1:
A support means is provided in advance at the position where the portion to be machined will be located, before the assist gas is ejected. This preliminary support counteracts the displacement force of the assist gas, preventing the workpiece from moving into the nozzle path even at high machining speeds, thus avoiding interference while maintaining productivity.
3Manufacturing precision
If a local support means is provided to support the portion to be machined, then machining precision is improved, but the apparatus complexity and cost increase due to additional moving mechanisms
Solution Approach 1:
The new support means is merged with the existing multi-pin type support means into a unified support system. Both support means work together to provide comprehensive support: the multi-pin type support means handles general workpiece support while the new support means provides localized support at the machining position. This merging avoids the need for completely separate, complex moving mechanisms while achieving improved machining precision.
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
The apparatus effectively suppresses workpiece displacement during machining, ensuring consistent machining conditions and preventing collisions by providing enhanced support to the width ends, allowing for precise cutting without the need for complex or costly support mechanisms.
Implementation Method 1
end support parts (11), each having a Bernoulli pad (18a)
Data Source
AI summary
A laser machining apparatus is provided with: a workpiece support unit; a machining head; and a machining head moving unit. The workpiece support unit includes: an end support part that supports a width end of a workpiece; and an inside support part that supports an inside portion of the workpiece in a width direction. The end support part is movable in a longitudinal direction independently from the inside support part in response to a movement of the machining head.