Stainless Steel Laser Cutting Metal Parts

1. Order and Technical Review

Order Receiving: Receive 2D/3D drawings, technical requirements, and quantities provided by the customer.

Technical Review: Engineers review the feasibility of the drawings, including:

Material Type: Confirm the stainless steel grade (e.g., 304, 316, 430, etc.).

Sheet Thickness: Assess whether the thickness is within the equipment's capabilities (typically carbon steel can reach 30mm, stainless steel is slightly thinner).

Part Structure: Check for microholes, sharp corners, narrow slits, or other structures that are difficult to handle with laser cutting or affect quality.

Tolerance Requirements: Confirm dimensional and geometric tolerances to ensure laser cutting can meet them.

2. CAD Drawing Design and Conversion

Use CAD software (such as AutoCAD, SolidWorks) to draw or optimize the customer's part drawings.

Convert all lines into closed contours, which is the basis for the laser path.

3. CAM Programming and Layout

This is a crucial step, completed in CAM software (such as Lantek, SigmaNEST).

Import Drawings: Import the CAD file into the CAM system. **Sheet Metal Layout:** Arrange multiple parts on a single sheet of stainless steel to maximize material utilization. Advanced software automatically optimizes the layout.

**Adding Micro-Connections:** To prevent small parts from falling off during cutting or being blown away by the nozzle, tiny connection points (approximately 0.2-0.5mm) are added to the contour. These can be easily removed with a gentle tap.

**Setting Cutting Parameters:** Preset cutting speed, laser power, air pressure, frequency, and other parameters in the software according to the material type and thickness.

**Generating NC Code:** Convert the layout and parameters into G-code programs recognizable by the laser cutting machine.

4. Material Preparation

** Prepare stainless steel sheets of the appropriate material and thickness according to order requirements.

**Sheet Metal Lifting:** Use an overhead crane or forklift to transport the steel sheets to the laser cutting machine's worktable.

**Cleaning and Leveling:** Ensure the sheet metal surface is clean, free of oil and scratches, and level it if necessary.

5. Loading and Positioning

** Precisely place the stainless steel sheet on the worktable.

6. Equipment Debugging and Focusing

Debugging the Cutting Head: Install the appropriate nozzle and set the correct focus position. The focus position has a decisive impact on cutting quality and speed.

Gas Selection and Pressure Setting:

Oxygen: Used for cutting carbon steel, utilizing oxidation to provide additional heat, resulting in high speed, but leaving an oxide layer (black) on the cut.

Nitrogen: Preferred for stainless steel cutting. As a protective gas, it blows away molten metal, preventing oxidation and obtaining a clean, silvery-white cut without oxidation. High pressure and purity are required.

Air: Can be used for thin, non-critical parts, low cost, but the cut will have a slight amount of oxidation.

7. Executing the Cut

Start the program, and the laser cutting machine begins automatic operation.

Process Summary: A high-energy-density laser beam irradiates the stainless steel surface, instantly melting or even vaporizing it. Simultaneously, a high-pressure auxiliary gas (such as nitrogen) blows away the molten material, forming a kerf.

Perforation: The laser beam first drills a small hole in the sheet metal as a starting point, then begins contour cutting.

8. Unloading and Sorting

Remove the cut sheet metal from the worktable.

Parts Sorting: Remove the required parts from the scrap skeleton. For parts with micro-connections, gently tap them off with a rubber mallet or similar tool.

Scrap Disposal: Sort and recycle the remaining skeleton and scrap.

9. Quality Inspection:

First Piece Inspection: Before mass production, conduct a comprehensive inspection of the first cut part.

In-Process Sampling Inspection: Conduct periodic sampling inspections during production.

Inspection Contents:

Dimensional Accuracy: Use calipers, micrometers, coordinate measuring machines, etc., to check critical dimensions.

Knock Quality:

Perpendicularity and Bevel: Check if the cut is perpendicular or has a bevel (usually wider at the top and narrower at the bottom).

Roughness: Check the smoothness of the cut surface.

Slag Adhesion: Check for any molten metal slag adhering to the back. High-quality nitrogen cutting should have virtually no slag adhesion.

Burrs: Inspect edges for sharp burrs.

10. Post-processing

Depending on customer requirements, this may include one or more of the following processes:

Burner removal: Remove minor burrs using an angle grinder, file, scraper, or specialized burr remover.

Heat treatment: Eliminate internal stress in the heat-affected zone (HAZ) of the cut edges.

Surface treatment:

Vibratory grinding/polishing: Remove sharp edges and improve surface finish.

Sandblasting/brushing: Unify the surface color and texture of parts.

Electropolishing/passivation: Further improve the corrosion resistance of stainless steel and give it a bright surface.

11. Final inspection, packaging, and warehousing

Perform a final inspection of all processed parts to ensure they meet customer standards.

Pack using appropriate packaging materials (such as bubble wrap, pearl cotton, and partitions) to prevent scratches and deformation during transportation.

Label with part number, quantity, batch number, etc.

Complete warehousing procedures and await shipment.

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