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Femtosecond Laser Spin-Cutting - 70μm Zero-Taper Microholes in Tungsten Steel

In the field of precision manufacturing,"holes" often determine the upper limit of a product's performance. Recently, Yue Qian Laser successfully completed an extreme challenge:

Microholes with a diameter of 70±2 μm (about the diameter of a hair) are processed on 0.4 mm thick tungsten steel. The customer's requirements are extremely demanding: not only must the upper and lower apertures be consistent (zero taper), but also that there is no splashing, no slag residue, and no recasting layer in the orifice and hole, and it is forbidden to remove the slag for the second time.

Tungsten steel: hard and brittle "industrial teeth"

The core characteristics of tungsten steel areextremely high hardness (HRA 90+) and excellent wear resistance, maintaining high hardness even at high temperatures of 1000°C. Traditional machining has three inherent disadvantages:

◇ Extremely high hardness: Traditional drill bits may wear out immediately upon contact, and tool losses are extremely large.

◇High brittleness:sensitive to processing stress, easy to crack or chip at high strain rate.

◇Porosity and hard particles:Hard particles (WC) in its microstructure can cause interruptions in the cutting process, causing micro-chipping of the tool.

Zero taper vertical holes: what's the challenge?

Achieving small apertures in laser processing may not be difficult, but achieving "zero taper" with tolerances within ±2μmis extremely challenging.

Due to the energy characteristics of the Gaussian distribution of femtosecond lasers, the beam will diverge when penetrating deep into the material when traditional direct writing drilling, resulting in energy attenuation, and it is easy to forma taper hole with "big at the top and small at the bottom". This taper hole is not allowed in high-end applications: in fuel injectors, taper can lead touneven atomization; On the probe card, the taper can causethe probe to tilt and the test will fail.

Yueqian Laser's zero-taper microviacity solution

In the face of extreme challenges, Yueqian Laser relies onfemtosecond laser peeling technologyto achieve breakthroughs, fully demonstrating its deep technical accumulation in the field of advanced optics and precision intelligent manufacturing

◇Dynamic compensation, zero taper:Accurately control the angle of incidence of the beam and the rotation diameter, dynamically compensate the energy when the processing depth increases, and actively correct the natural taper to achieve the exact same inlet and outlet diameter.

◇Extreme cold processing, no residue:femtosecond laser pulse eliminates slag and recasting layer from the root. Under the microscope, the pore edge is sharp and has no chipped edges, and the pore wall is as smooth as a mirror.

◇ One-time molding, direct use:no thermal damage, no splashing, no post-processing of the workpiece, directly enter the next assembly process.

Inlet pore size morphology: pore size is only 70.91μm, 70.60μm, 70.90μm

Outlet pore size morphology: pore diameter is only 71.37μm, 70.95μm, 70.95μm

Application prospects: not only tungsten steel, but also the key to precision manufacturing

While traditional processes stop in the face of hardness and brittleness,Yueqian Laser's femtosecond peeling technologyis redefining the boundaries of micromachining. If you have the ultimate pursuit of "zero taper, no recasting, and direct use" for micropores, Yueqian Laser looks forward to walking with you.

◇3C and mold industry:the air permeability holes and ejector pin holes of precision injection molds are required to be wear-resistant and not clogged.

◇ Automotive industry:Gasoline direct injection (GDI) injectors, zero taper micropores are the key to achieving efficient combustion and reducing emissions.

◇Semiconductor packaging: The verticality of the holes on the probe card is directly related to the yield of chip testing.

◇Medical devices:microfluidic chips, drug sustained-release carriers, which require precise vertical channels to control fluids.

◇Aerospace: Air film cooling holes on difficult-to-machine materials such as high-temperature alloys and tungsten alloys have extremely high requirements for hole wall finish and no microcracks.