Commonly used cutter bit of diamond cutting disc has co-based, iron-based and copper-based. The diamond cutting disc cutter bit is sintered by diamond and matrix binder, and the material of the matrix binder is different, resulting in four common diamond cutter heads: iron-based, copper-based, cobalt-based and silicon carbide-based. Types of cutter head bond, copper-based products are not widely used due to their yellowish color, while silicon carbide-based products are not widely used. 

Because cobalt has good wettability to diamond, high elastic modulus, high temperature strength, and moderate sintering temperature, Co-based diamond cut off wheel is easy to meet the requirements of the carcass for diamond holding force and diamond layer change coordination wear. In the manufacture of diamond tools, especially when the cutting head requires heavy load and high efficiency cutting, it has an irreplaceable position. But its price is relatively high.

What are co-based cutter bits?

Co-based cutter bits are completely different from iron-based cutter heads. Co-based cutter heads are divided into low-cobalt-based diamond cutter heads (cobalt powder content 20-50%) and high-cobalt-based diamond cutter heads ( Cobalt powder content 50%-70%) and all-cobalt-based diamond cutter head (cobalt powder content 70%-90%), cobalt powder and diamond have a strong fusion, in terms of holding force, the physical and physical properties of diamond are greatly improved Chemical holding force, the cutter head with more cobalt powder content, the higher the holding force. The strength of the cobalt-based diamond segment itself is not high. For the process of cutting the stone with high abrasiveness, the cobalt-based matrix is consumed very quickly, but it is not as good as the performance of the iron-based segment. Therefore, the cobalt-based segment is mainly used for cutting marble, limestone, travertine and other soft stones.

Disadvantages of cobalt-bas

ed blades?

For example, due to the high price of cobalt powder, cobalt-based cutter heads are often several times or even dozens of times more expensive than iron-based cutter heads, and the process difficulty of cobalt-based cutter heads is also higher than that of iron-based cutter heads, especially all-cobalt cutter heads. Products, the current technology is still extremely confidential, and there are very few manufacturers that can produce it, so the price of all-cobalt cutter bits is relatively high.

Copper or bronze-based matrix has low cost and good process performance, but it does not wet diamond, has low self-strength, and poor ability to hold diamond. It is only suitable for light loads of soft materials or as grinding tools. Iron has a medium elastic modulus, good wettability to diamond, and low price, so it is the best choice for matrix material.

Iron-based carcass shows excellent performance when processing high wear-resistant materials, but iron is prone to excessive corrosion of diamond, which damages the strength of diamond, and its high temperature performance is poor, making iron-based carcass and diamond, processing objects The range of adaptation is narrowed.

What is an iron-based blade?

During the sintering process of the diamond segment, various metal powders are mixed. If the metal powder contains more iron powder, then this type of segment can be called an iron-based segment. In the same way, the cobalt-based cutter head is a diamond cutter head with more cobalt powder in the sintering process of the cutter head.

Then the question comes, what kind of iron-based cutter head contains cobalt powder? or does the cobalt-based cutter head contain iron powder?

In fact, a small amount of cobalt powder can be contained in the iron-based cutter head, and part of the iron powder will also be added to the cobalt-based cutter head, mainly because iron and cobalt are elements that are close to diamond, and they are compatible with copper. The alloy formed by the tin element can greatly increase the strength of the diamond cutter head bond, thereby forming a tighter material structure, so that the cutter head has stronger abrasiveness.

What are the characteristics of iron-based cutter heads?

First of all, iron-based cutter heads have a high content of iron, and iron powder is the most common metal in nature, so the price is much cheaper than other powders. The low price of raw materials brings about the low overall price of iron-based diamond cutter heads. . In terms of performance, the iron-based diamond segment has extremely high hardness and high wear resistance. Such a segment is suitable for cutting extremely hard stones or relatively abrasive stones, such as granite, quartz, and sandstone. Such as stone, it is very suitable to cut with iron-based cutter head.

Disadvantages of iron-based blades?

If the abrasiveness is too strong, when cutting soft stones or stones with a low degree of grinding, it is easy to have poor edge sharpening, flattening of the cutter head, rounded diamond, etc., and the iron-based cutter head uses a large amount of iron powder, Therefore, it is very easy to oxidize, and rust is very easy to contaminate the slate, so this kind of cutter head is more suitable for continuous cutting, and it is better to consume it quickly.

Co-based cutter heads are completely different from iron-based cutter heads. Cobalt-based cutter heads are divided into low-cobalt-based diamond cutter heads (cobalt powder content 20-50%) and high-cobalt-based diamond cutter heads ( Cobalt powder content 50%-70%) and all-cobalt-based diamond cutter head (cobalt powder content 70%-90%), cobalt powder and diamond have a strong fusion, in terms of holding force, the physical and physical properties of diamond are greatly improved Chemical holding force, the cutter head with more cobalt powder content, the higher the holding force. The strength of the cobalt-based diamond segment itself is not high. For the process of cutting the stone with high abrasiveness, the cobalt-based matrix is consumed very quickly, but it is not as good as the performance of the iron-based segment. Therefore, the cobalt-based segment is mainly used for cutting Marble, limestone, travertine and other soft stones.

Therefore, how to choose the metal diamond cut off wheel requires comprehensive research and judgment to make a reasonable choice.

---EDITOR: Doris Hu, Anna

---POST: Doris Hu