The core approach to improving the machinability of laminated steel plates is through a combination of material pre-treatment, process optimization, and tool adaptation to reduce processing difficulty, minimize defects, and ensure stable post-processing performance.
1. Material pre-treatment: improving the processing foundation
Select easily machinable base materials or adjust composition, such as choosing modified steels containing sulfur, selenium, or other free-cutting elements, or reducing the content of hard and brittle phases in the base material.
Optimize heat treatment; cold-rolled plates can be annealed to reduce hardness and internal stress. For martensitic stainless steel (such as SUS630), solution treatment can be performed first to improve plasticity before machining.
Pre-treat the surface to remove oxide scale, rust, or oil to prevent excessive tool wear and reduce surface defects during machining.

2. Machining process parameter optimization: adapting to material characteristics
Adjust cutting parameters according to steel hardness, selecting appropriate cutting speed, feed rate, and depth of cut. For hard materials, reduce cutting speed and feed to avoid tool chipping.
Optimize welding processes using low-deformation methods such as argon arc welding or gas-shielded welding. Preheat appropriately for high-strength materials and perform post-weld stress relief to reduce cracking and deformation.
Control deformation in cold working, avoiding large single-step deformation. Use multi-step forming with intermediate annealing to relieve stress and prevent cracking.

3. Tool and auxiliary condition adaptation: reducing machining resistance
Use matched cutting tools; for cutting stainless steel or other sticky materials, employ carbide or diamond-coated tools. For welding, use appropriate welding consumables corresponding to the stainless steel type.
Use suitable cutting fluids or lubricants with good cooling and lubrication properties to reduce friction. Apply lubricants during cold forming to decrease forming resistance.
Optimize machining equipment accuracy, ensuring rigidity and positioning precision of machines and fixtures to prevent vibration-induced surface roughness or dimensional deviation.

4. Post-processing: consolidating machining effects
Perform stress-relief annealing, especially for high-strength or heavily deformed components, to eliminate residual stress and prevent later deformation or cracking.
Grind and inspect welded joints, remove burrs and defects, and perform local re-welding or surface treatment if necessary to ensure quality.