In the field of precision sheet metal processing, cutting 0.15mm slit long holes in 2mm thick stainless steel plates is an extremely challenging operation. Many customers raise similar questions during consultations: can such a narrow slit width actually be achieved? The answer is yes — but it requires selecting the right processing method and strictly controlling process parameters.

1. Technical Challenges of Cutting 0.15mm Slits in 2mm Stainless Steel Plates

A slit width of 0.15mm is already close to the processing limit of traditional wire cutting, and for laser cutting, this dimension likewise falls within the fine machining range. The 2mm thick stainless steel plate (commonly used grades being 304 or 316L) presents the following challenges during cutting:

• The extremely narrow slit width demands exceptionally high beam focusing precision, with the spot diameter needing to be controlled within 0.1mm
• The straightness and consistency of long holes are difficult to guarantee, prone to taper deviation
• Improper control of the heat-affected zone (HAZ) can lead to plate deformation, affecting overall flatness
• Cutting speed that is too fast or too slow will affect cut surface quality, causing dross formation or burn-through

2. Laser Cutting Solution: The Preferred Process for 0.15mm Slits

For the processing requirement of 0.15mm slit long holes in 2mm stainless steel plates, fiber laser cutting is currently the most mature and efficient solution. Compared to wire cutting and stamping, laser cutting offers the following significant advantages:

1. High-Precision Focusing Optics

Using high-quality fiber lasers paired with precision focusing lens assemblies, the spot size can be compressed to 0.05–0.1mm, fully meeting the cutting requirements for 0.15mm slit widths. Combined with a high-precision servo motion platform, positioning accuracy can reach ±0.02mm, with repeat positioning accuracy of ±0.01mm.

2. Process Parameter Optimization

In actual processing, the typical parameter settings for cutting 0.15mm slits in 2mm stainless steel plates are as follows:

• Laser power: 500W–1000W fiber laser
• Assist gas: high-purity nitrogen (purity ≥99.99%), gas pressure 0.6–1.0MPa
• Cutting speed: 2–5m/min (adjusted according to power and plate thickness)
• Focal position: negative defocus 0.2–0.5mm to ensure concentrated energy

3. Quality Control Key Points

To ensure the cutting quality of 0.15mm slit long holes, in addition to equipment precision, the following key aspects must be addressed:

1. Plate Clamping and Flatness

Before cutting, 2mm stainless steel plates must be ensured flat. It is recommended to use vacuum suction worktables or precision fixtures for clamping to avoid focal length deviation caused by plate warping. Stress relief around the cutting area should also be handled in advance to prevent deformation after cutting due to stress release.

2. Cut Surface Quality and Dross Control

Using nitrogen as the assist gas effectively prevents oxidation of the cut surface, producing a bright finish. If bottom dross appears, the cutting speed can be appropriately reduced or the focal position adjusted. For the start and end positions of long holes, a progressive acceleration/deceleration strategy is recommended to avoid burn-through.

3. Thermal Deformation Compensation

During continuous cutting of long holes, heat accumulation may cause localized thermal deformation. It is recommended to use alternating cutting paths by zone, or employ Micro Joint technology to maintain plate rigidity, followed by separation processing after cutting is complete.

4. Application Scenarios and Typical Customer Cases

0.15mm slit long holes in 2mm stainless steel plates are widely used in the following fields:

• Precision filters and screen mesh: filtration elements in the chemical and food industries, where slit width accuracy directly affects filtration performance
• Electronic component heat sinks: high-density cooling fins, where uniformity of slit spacing determines thermal performance
• Medical device components: precision slots in surgical instruments, with extremely strict dimensional tolerance requirements
• Sensor housings: sealing grooves and positioning holes for various types of sensors

JJY Laser has successfully delivered similar orders for multiple precision manufacturing clients, achieving cut surface finish of Ra3.2 or above, with slit width tolerance controlled within ±0.02mm, fully meeting precision machining requirements.

5. Summary

Cutting 0.15mm slit long holes in 2mm thick stainless steel plates is entirely feasible, with fiber laser cutting being the optimal process choice. The key lies in selecting laser cutting equipment with high-precision optics and motion control capabilities, combined with an experienced process team for parameter optimization. If you have similar precision cutting requirements, please contact us for free sample cutting and process evaluation services.