Global Din 51crv4 Alloy Steel Polishing Surface Treatment Technology - China

DIN 51CrV4 alloy steel is a commonly used alloy spring steel with excellent mechanical properties (high strength, high toughness, and fatigue resistance).

It is often used in the manufacture of high-stress components such as springs and shafts.

The polishing process requires selecting the appropriate technology based on the material properties and the application (e.g., reducing stress concentration, improving corrosion resistance, or aesthetic requirements).

The details are as follows: Main Polishing Techniques

Depending on the surface roughness requirement (e.g., Ra 0.8μm → Ra 0.02μm), the following steps can be followed:

1 - Rough Polishing (Finishing Stage)

- Tools: Resin-bonded grinding wheel (180-400 grit), wire wheel, or flap wheel.

- Purpose: Remove residual machining marks from pre-treatment and reduce the surface roughness to Ra 0.8-1.6μm.

2 - Intermediate Polishing (Refining Stage)

- Tools: Aluminum oxide or silicon carbide abrasive (600-1200 grit) with a soft cloth or felt wheel.

An oil-based polishing fluid (such as a mixture of engine oil and abrasive) may be added to reduce frictional heat.

- Purpose: Further eliminate scratches, reduce surface roughness to Ra 0.2-0.4μm, and create a preliminary glossy finish.

3 - Fine Polishing (Mirror Finish Stage)

- Tools: Ultra-fine diamond abrasive (1500-8000 grit) or chromium oxide or silica polishing paste (W1-W5 micronized powder) with a wool or suede wheel.

The speed can be increased to 2000-4000 rpm.

- Purpose: Achieve a mirror finish on DIN 51CrV4 alloy steel, achieving a surface roughness of Ra 0.01-0.05μm, meeting requirements for high reflectivity or precise fit.

Through the above technologies, the surface quality of DIN 51CrV4 alloy steel can be effectively improved, taking into account its mechanical properties and reliability.

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