According to the shape and size of the grinding object to choose the appropriate grinding sheet need to consider the following aspects:
** A, surface grinding **
1. Large area plane
- For large area surfaces, such as large sheet metal or flat glass, a large round or rectangular grinding piece should be selected, usually more than 200mm in diameter. This can improve grinding efficiency, reduce overlap of grinding marks, and ensure surface smoothness.
- For example, when grinding a 2m x 1m stainless steel plate, the use of 300mm diameter alumina grinding sheet can cover the entire surface more quickly.
2. Small area plane
- When the grinding object is a small flat part, such as a mobile phone screen or small metal parts, choose a small diameter grinding sheet, generally between 50mm-150mm. Smaller grinding pieces are easier to operate in a limited space and enable more precise control of the grinding area.
- For example, when grinding a mobile phone screen, using a cerium oxide grinding sheet with a diameter of 100mm can better handle its edges and corners.
Two, surface grinding **
1. Simple surface (such as cylinder, cone)
For simple surfaces of this type, a strip or arc grinding sheet with certain flexibility can be selected, and its width and arc should match the size and shape of the surface.
- For example, when grinding a cylindrical metal shaft, a curved silicon carbide grinding sheet of moderate width can be used to fit the cylindrical surface for uniform grinding.
2. Complex surfaces (such as free-form surfaces, irregular surfaces)
- For complex irregular surfaces, such as the surface of automotive molds, it is best to choose deformable, soft grinding materials, such as spongy or rubbery grinding pieces, or use a small handheld grinding tool with various shapes of grinding heads.
- For example, when dealing with complex surfaces of automotive molds, the use of spongy diamond grinding sheets can adapt to changes in the surface to achieve better grinding results.
** Three, inner hole grinding **
1. Small bore hole (diameter less than 20mm)
- For small bore holes, a slender, small diameter cylindrical grinding rod or inner bore grinding head should be used. These grinding tools are usually made of materials with higher hardness, such as diamond or cemented carbide.
- For example, when grinding a small hole with a diameter of 10mm, using a diamond grinding rod with a diameter of 8mm can effectively remove defects on the surface of the inner hole.
2. Large bore hole (diameter greater than 20mm)
- For large bore holes, such as shaft bushings in mechanical parts, a large diameter cylindrical grinding disc or a grinding tool with expansable supports can be selected to ensure that the grinding disc can fully contact the surface of the inner hole.
- For example, when grinding an inner hole with a diameter of 50mm, using a diameter of 45mm alumina grinding sheet, combined with the appropriate support device, can achieve uniform grinding of the inner hole.
Four, small parts and precision parts **
1. For very small size parts, such as micro electronic components or watch parts, it is necessary to use micro grinding pieces or grinding paste, combined with fine grinding tools to operate.
2. For example, when dealing with the tiny gears in the watch movement, special micro-grinding pieces and precision grinding tools are used to ensure accurate grinding without damaging the parts.
In short, choosing the right grinding sheet according to the shape and size of the grinding object can improve the grinding efficiency and quality, and ensure that the surface after grinding meets the requirements.