Q620 steel is a high-strength low-alloy structural steel. Its cutting process must take into account the material's high strength, relatively high hardness (200-260HB in quenched and tempered state), and large cutting resistance. By reasonably selecting tools, cutting parameters, and process methods, the processing efficiency and surface quality can be ensured. The following are the specific cutting process and key points:

I. Preparation before Cutting

Confirmation of Material State

Q620 steel is usually delivered in quenched and tempered state (quenching + high-temperature tempering). At this time, it has high hardness and strength, making cutting more difficult. If heavy stock removal or complex shape processing is required, rough machining can be performed first in the annealed state (hardness ≤180HB), and then finish machining can be carried out after restoring performance through quenching and tempering to reduce cutting resistance.

Check the surface condition of the material, remove oxide scale, rust, or burrs to avoid aggravating initial tool wear.

Tool Selection

Tool Material: High-strength and wear-resistant tools should be selected. Priority is given to carbide tools (such as WC-Co based alloys with TiC, TaC, etc., added to enhance wear resistance) or coated tools (such as TiN, TiAlN coatings, which can improve surface hardness and heat resistance). For high-precision finish machining, ceramic tools (such as Al₂O₃-based ceramics) can be used, but impact loads should be avoided.

Tool Geometric Parameters:

Rake angle: A small value (-5°~5°) is adopted to enhance the edge strength and prevent chipping.

Clearance angle: 5°~8° to reduce friction between the tool and the workpiece surface.

Edge inclination angle: 0°~-5° to control chip flow direction and avoid scratching the machined surface.

Nose radius: 0.5~1.5mm, adjusted according to machining accuracy to reduce surface roughness.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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