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In the world of precision engineering, a tiny hole can make or break a technology. Recently, Yueqian Laser used femtosecond laser to accurately process 5 complex microporous structures on 0.5mm thick stainless steel plates, including: 0.1mm oblique hole with an aperture diameter of 0.1mm, a positive inverted cone hole (0.2-0.1mm), a 0.1mm straight hole, and an X-shaped hole (0.2-0.1-0.2mm) with great technical challenges. It successfully demonstrated the leading strength of Yueqian Laser in the field of ultra-precision micromachining.
01
What are the use of positive cones, inverted cones, straight holes, and X-shaped holes?
◇ Positive cone hole (large inlet, small outlet): conducive to fluid focusing and improving the injection speed.
◇ Inverted cone hole (small inlet, large outlet): helps reduce the risk of clogging and enhance fluid diffusion.
◇ Straight hole: Although the structure is simple, its roundness, verticality and inner wall finish directly affect the flow efficiency and sealing at the micron scale of 0.1mm.
◇ X-shaped cross hole: two holes cross to form an "X"-shaped channel to achieve multi-directional fluid convergence.
02
Difficulties in the processing of complex microporous structures
0.5mm thick stainless steel plate
To achieve micron-level complex hole shapes on such thin stainless steel plates, traditional processing methods such as mechanical drilling, EDM or ordinary lasers are often "more than enough and not enough":
◇ Serious thermal impact: it is easy to produce burrs and recast layers, which affects fluid patency.
◇ Limited accuracy: It is difficult to control the consistency between taper and pore size, and it cannot meet the tolerance requirements of ±5μm.
◇ Single structure: complex geometries such as oblique holes and X-shaped holes are difficult to form.
◇ Material damage: Stainless steel has high hardness, and traditional methods are prone to microcracks or deformation.
03
Yueqian Laser's complex microporous structure solutions
Relying on the core technology of femtosecond laser "cold processing" , Yueqian Laser unlocks the perfect solution for complex micro-hole processing
◇ Ultra-short pulse: the action time is only femtosecond, the energy is instantaneously deposited, and there is almost no heat conduction, realizing "cold processing".
◇ Ultra-high precision: The focusing spot is as small as microns, and the aperture, taper and position can be accurately controlled.
◇ No mechanical stress: non-contact processing, avoid material deformation, and ensure the integrity of the sheet.
With deep experience in micro-nano processing, Yueqian Laser leverages the potential of femtosecond lasers to the extreme through innovative optical path design and process optimization: precise topography and depth control, whether it is the angle locking of oblique holes or the forming of X-shaped intermediate throats, we strictly control the depth and critical dimensional errors at the micron level.
The intersection area of the X-shaped hole processed by Yue Qian laser is smooth and burr-free
The inverted taper hole outlet is clear and sharp
The angle of the oblique hole processed by Yue Qian laser processing is precise and controllable
Yue Qian laser processed 0.1mm straight hole and positive cone hole
04
Yueqian laser empowers medical, aerospace and new energy
This successful processing case is not only a technical verification, but also a key step towards high-end applications. This type of microporous structure is widely used in:
◇ Medical field: insulin pump nozzles and microneedle delivery systems require sterility, precision, and low resistance.
◇ Aerospace: Engine fuel nozzles need to be resistant to high temperature, corrosion, and uniform atomization.
◇ New energy: hydrogen fuel cell flow field plates and battery injection holes affect energy conversion efficiency.
◇ Semiconductor equipment: The reaction channel in the microfluidic chip, relying on high-precision hole type control.