Segments matrix system for diamond saw blades for cutting quartz
Generally, it is divided into four categories according to the alloy type of binder, namely bronze binder, cobalt-based binder, tungsten-based binder and iron-based binder. Among them, the most widely used is the bronze bond.
(1) Bronze bond.
Such binders include copper-based, bronze, brass, drill bronze, drill brass, etc., with copper as the main component, and may also contain Zn, Co, NiFe and other metals at the same time or in part. Copper-based binder has low sintering temperature, low hardness, low strength, high toughness, moderate bonding strength with diamond (poor wettability and chemical affinity, weak mechanical holding force) and low price. Scope of application: It should be matched with diamond with good sharpness, and marble, soft granite, etc. are the main sawing objects.
(2) Drill-based binder.
The diamond-based bond is mainly composed of diamond, with an appropriate amount of copper, and a small amount of Ni, Sn, Zn and other components are often added. This kind of binder has moderate sintering temperature, moderate hardness, moderate strength, moderate toughness, good self-sharpening, stable performance, easy and expensive domestic price, and wide application range. It can be matched with medium-strength and high-strength diamonds and is widely used In cutting saw blades for granite and marble.
(3) Tungsten-based binder.
Tungsten-based binders are used in the form of WCWC or W powder. With appropriate amount of CuSn, ZnFeCo, Ni and other ingredients. This type of tungsten-based bond has the highest hardness and the worst self-sharpening. It has a certain chemical effect on diamond. The sintering temperature is also the highest. Therefore, high heat-resistant diamond is required to be matched with it. It is suitable for sawing quartz countertops and quartz slabs with high hardness, high wear resistance and high quartz content, especially suitable for processing difficult-to-machine materials such as high quartz content granite and reinforced concrete.
(4) Iron-based binders.
Iron-based binders use iron as the main component, and are used in combination with appropriate amounts of copper and nickel, and Sn, Zn, Co and other components are often added. The mechanical properties of this type of bond, such as hardness and strength, are similar to those of cobalt-based bonds, the toughness and self-sharpening are slightly worse than those of cobalt, and the chemical effect on diamond is more pronounced than that of diamond. The properties of iron-based binders will change a lot with the changes of alloy formulation and sintering temperature and other process conditions. The effect of diamond content in iron-based binder on the mechanical properties of the matrix. With the increase of diamond content, the hardness of the matrix gradually decreases, while the flexural strength gradually increases. As the diamond content increases, the bond strength between the binder and the diamond increases. There is an increasing trend.
This trend is more obvious if the diamond surface is titanium-coated. The performance of iron-based binder is not stable enough, and the price is the lowest. Basically the same as the cobalt-based bond, the iron-based bond can be used instead of the cobalt-based bond. Certain iron-based bonds outlast drill-based bonds when machining red granite. Suitable iron-based formulation segments also have excellent performance when processing black granite. If the segment formula or sintering process of the saw blade is improper, the segments will not be sharp when processing soft stone.
Selection of binder for saw blades for cutting quartz
The conditions for diamond saw blades to cut quartz are much better than that for drill bits to break the rock at the bottom of the hole. First of all, the power transmission of the diamond saw blade is simple and reliable, and the linear speed of the saw blade is more than ten times higher than that of the drill bit, so the saw blade works relatively smoothly; secondly, the quartz powder generated during the sawing process is easy to remove and clean, and the cooling of the saw blade The effect is good; thirdly, the diamonds on the segments work in contact with the quartz slabs periodically and intermittently. As mentioned above, the matrix performance index of the saw blade for cutting quartz countertop is lower than that of the drill bit, and a reasonable choice should be made according to the type of stone.
In terms of wear resistance, tungsten carbide-based binders are the most wear-resistant and have the highest hardness. The bronze base is the softest and least wear-resistant. Hardness and wear resistance are proportional. Cobalt-based binder is the most widely used, and its hardness, wear resistance and cutting efficiency are relatively moderate. The hardness and wear resistance of the binder can be adjusted by adjusting the content of cobalt base and the proportion of other low melting point metals, so as to adapt to the cutting process of quartz countertops.
The binder is selected according to the processing of different stones. When used to process soft marble, use bronze bond with hardness >88HRB. High diamond or pure cobalt binder is used when processing hard stone such as quartz countertops and slabs, and its hardness ranges from 88 to 108HRB. When used for cutting reinforced concrete, etc., a tungsten carbide-based binder is used, and its hardness ranges from 40 to 45HRC. The hardness of the bond is an important indicator of diamond segments, and it is also an important physical quantity to measure the performance and process stability of the bond in the production process. Due to the different composition and proportion of each binder, the forming density, pressure and sintering conditions are different, and the hardness of the carcass obtained is also different. The hardness of the diamond matrix should correspond to the hardness of the quartz being processed.