Stone grinding and polishing technology

Shanghai Jiani Material Technology Co., Ltd. is a professional company specializing in the production of stone tiles.

Advantages of Mechanical Grinding and Polishing

Grinding delivers consistent finished surfaces. Profiles of various sizes can be fabricated out of sequence and feature excellent interchangeability for assembly.

The ground profiles are free of waviness, with superior flatness and straightness on surfaces.

For rotary workpieces, this process produces precise arcs with high gloss and high processing efficiency.

It reduces labor intensity for grinding and polishing operations.

It improves the working environment of grinding and polishing workshops.

It is fully compatible with assembly line mass production.

Disadvantages of Mechanical Grinding and Polishing

High upfront investment is required, including equipment, workshop space and custom forming grinding wheels.

Limited process flexibility; the method is only economical for mass production batches.

Custom forming tools must be manufactured for each profile type. A complete set of wheels for rough grinding, fine grinding and polishing is mandatory for every product line.

Thin and long stone profiles are prone to cracking or breaking under mechanical pressure during processing.

Forming grinding wheels need to be custom-made by professional manufacturers with strict precision tolerances.

The gloss of mechanically finished profiles is moderate. Fine linear grinding marks remain on surfaces and impair visual appearance — this is the primary drawback of mechanical profile grinding and an urgent technical challenge to resolve.

Unsuitable for fragile stone materials susceptible to breakage.

Standard Grinding & Polishing Process Flow

1. Inspect the geometry of semi-finished stone pieces against the processing drawing. Only qualified workpieces may proceed to grinding and polishing.

2. Carry out glue filling repair according to material conditions prior to grinding; commence polishing only after repairs are fully cured.

3. Mark each individual piece and perform rough grinding, leaving a 0.5mm stock allowance for subsequent fine grinding and wet polishing.

4. Splicing: Assemble all profiles in accordance with assembly drawings. Match and adjust pieces by color and vein to achieve uniform visual effects across the finished assembly. After wet grinding with #500 abrasive, assign unique serial numbers to each piece as per drawings before disassembling for final polishing. This prevents uneven joints between matched profiles.

5. If misalignment exists at joints, extend the transition grinding range as much as possible. Check straightness with a straightedge throughout grinding.

6. All finished ground and polished profiles must pass quality inspection prior to delivery.

Tips for Higher Gloss and Reduced Waviness on Special-Shaped Stone Artifacts

1. Select high-quality grinding and polishing abrasives.

2. After each grade of abrasive wheel or pad, thoroughly inspect the exposed polished surface. The subsequent finer abrasive grade must completely eliminate all scratches left by the previous coarser grade.

3. Strictly control water flow during processing. Insufficient cooling water will cause thermal scorching on polished surfaces.

4. Grind along the generatrix of stone profiles with long continuous strokes to avoid wavy textures.

5. Maintain high rotational speed during polishing.

6. Use high-speed electric grinding and polishing power tools.

7. For mass production of stone profiles, forming grinding wheels are recommended. They reduce rough grinding workload and ensure uniform geometry and consistent quality across all finished profiles.

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