Perhaps the most commonly sighted diamond circular saw blades are the sintered metal-bonded ones, on which diamonds are mixed and sintered with metal bond materials to form the blades’ cutting edges — diamond segments. Normally, these blades are made via 3 methods: wholly sintering, silver brazing and laser welding. The diamond blades made via these 3 methods are different and have their respective features and applications.

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There are many kinds of metal bonds applied in diamond tools, for example, the cemented carbide bond whose skeleton is tungsten carbide, and Fe-based bond whose composition is mainly Fe and Ni. But the most widely used metal bond is bronze.

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The bond material used in metal-bonded diamond tools can be Cu-based alloy, Co-Ni alloy, Fe-based alloy and carbide-based alloy. Bronze bond material is a kind of Cu-based alloy, and is widely used in metal-bonded diamond tools’ manufacture.

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In diamond tools’ manufacture, the hot press method has below advantages:

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Cold-pressed diamond tools are much cheaper than hot-pressed diamond tools. They are still widely used in many applications. The cold press production method has some advantages:

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Metal bonds are widely used in diamond grinding wheels‘ manufacture. Among these metal bonds, Cu-Sn alloy is the mainly adopted bond. There are 3 modes in the metal-bonded diamond grinding wheels’ making.

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As diamonds have many excellent mechanical properties, for example, high hardness, big strength and good wear resistance, they have obvious advantages when being used in grinding contrasting with the common abrasives.

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When resin is used in diamond tools as the bond material, some approaches should be adopted to make it have below features:

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Earlier diamond segments of diamond circular blades were all designed to be even cuboids. Later, people found that, after a period of sawing, the two sides of the segments are easier to be worn than the middle, and the segments become a convex shape. The convex-shape diamond segments have a larger contact area with the material being cut, therefore the diamonds on them are easier to be ground blunt and then need dressing. In addition, as the sawing force will also increase, the core of the diamond blade tends to be distorted and be deformed for vibrations. This can influence the cutting precision, and reduce the blade core’s service life. Sandwich diamond segments, which have higher side layers and lower middle layers, however, can solve this problem to a great extent.

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The shape of diamond segments is an important factor influencing the performance of diamond blades. The different shapes are directly related to cutting efficiency and the ratio of the diamonds’ non-normal failure.

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