Diamond Tooling Articles

How Diamond Tools Work

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Diamond will work all types of materials from hardness of 40 on Rockwell scale and up. Diamond will machine hardest material, including those materials that other conventional types of abrasives, carbide and high speed steel will not.

Diamond Tools are “impregnated” with diamonds. This means that selected diamonds are mixed and hold inside and bond matrix which can be either sintered (metal bond), resin bond, hybrid bond, vitrified bond, etc. The bond hold the diamond crystals in various matrixes such as sintered (metal bond)  with specific metal alloys (such as iron, cobalt, nickel, bronze, and over 200 other components in various combinations). Resin bond with phenolic resin and various ceramic fillers, or vitrified bond which ceramic bond matrix

The diamond tools has  exposed diamond particles captured in a bond matrix each with a  small cutting edge.

Micro Fracture Process

Diamond tools are manufactured by embedding diamonds within a bond matrix, which can be of various types like sintered (metal bond), resin bond, hybrid bond, or vitrified bond. The bond securely holds the selected diamonds in place using different materials, such as metal alloys (e.g., iron, cobalt, nickel, bronze, and over 200 other components) for sintered (metal bond) tools, phenolic resin, and various ceramic fillers for resin bond tools, or ceramic bond matrix for vitrified bond tools. These exposed diamond particles within the bond matrix each possess a small cutting edge, enabling them to effectively cut through materials.

Cutting / Grinding Mechanism

When the diamond tool comes into contact with the material being cut or ground, the diamonds on the tool's surface initiate the cutting action.

The hardness of diamonds allows them to abrade or chip away at the material, creating a cutting or grinding action.

Fracture and Wear

As the tool engages with the workpiece, the diamonds undergo microscopic fractures due to the high stresses involved.

This controlled fracturing helps to expose new sharp diamond edges, ensuring a continuous cutting performance. Over time, as the tool is used, the diamonds may wear down, losing their sharpness and effectiveness.

Abrasion

Diamonds are extremely hard, and when they come into contact with a material, they can abrade or wear down the surface. This abrasion occurs due to the hardness disparity between the diamonds and the material being cut. The diamond particles on the tool's surface scratch and grind against the workpiece, gradually removing small particles and creating a cutting action.

Chipping

In addition to abrasion, diamonds can also chip away at the material. The hardness of diamonds makes them resistant to deformation, but other materials are not as durable. When a diamond tool encounters a material that is softer or less hard than the diamond particles themselves, the diamonds can cause micro-fractures or chips in the workpiece. These chips are then expelled from the cutting area, further facilitating the cutting process.

Controlled Fracturing

Diamond tools are designed to undergo controlled fracturing or breaking of the diamond particles during operation. The high stresses and forces involved in cutting or grinding cause microscopic fractures in the diamonds, creating fresh, sharp cutting edges. This controlled fracturing exposes new diamond surfaces and ensures a continuous cutting action as the worn diamonds are replaced by fresh ones.

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