In the production process of diamond segments, various problems may occur. There are problems caused by improper operation during the production process, and various reasons appearing in the process of formula and binder blending. Many of these problems affect the use of the segment. Under such circumstances, the diamond segment cannot be used or does not work well, affecting the production efficiency of the stone plate and even increasing the production cost. The following situations are prone to quality problems with diamond segments:
Incorrect segment specifications
Although the diamond segment is a mixture of metal alloy and diamond sintered by a fixed mold, the final product is completed by cold pressing and hot pressing sintering, and the material is relatively fixed, but due to the insufficient sintering pressure and sintering temperature during the processing of the segment, or During the sintering process, the temperature and pressure of the insulation and pressure are not enough or too high, which will cause uneven force on the segment, so naturally there will be reasons for the difference in the size of the segment. The most obvious manifestation is the height of the segment and the place where the pressure is not enough. It will be high, and the pressure will be too low. Therefore, in the production process, it is very necessary to stabilize the same pressure and temperature. Of course, in the pre-loading process, the cold press of the segment should also be weighed; also be careful not to take the wrong mold and cause the segment to be scrapped. Appear. The size of the diamond bit does not meet the requirements, the density is not enough, the hardness does not meet the requirements, there is debris in the transition layer, and the strength of the bit is not enough.
Insufficient density, segment bond soften
In the process of cutting the stone with the dense and soft bit, the bit fracture will occur. The fracture is divided into partial fracture and overall fracture. No matter which type of fracture, such a bit cannot be reused. Of course, the fracture of the segment is the limit. When cutting the stone, the segment with insufficient density will not be able to cut due to its insufficient Mohs hardness, or the segment will be consumed too fast. In general, the density of the segment must be guaranteed.
Such a situation is generally caused by sintering temperature, holding time, insufficient pressure, wrong choice of bonding agent material, high diamond content of the segment, etc. It is very common to occur, and it will also appear in old formulas. The general reason is the improper operation of the workers, and if it is a new formula, most of the reasons are caused by the designer’s lack of grasp of the formula. The designer needs to better adjust the segment formula and combine the temperature. And pressure, giving a more reasonable sintering temperature and pressure.
The main reason why the diamond segment cannot cut the stone is because the strength is not enough, and the strength is not enough for the following five reasons:
1: The diamond is not enough or the selected diamond is of poor quality;
2: Impurities, such as graphite particles, dust, etc., are mixed into the segment during mixing and loading, especially during the mixing process, uneven mixing can also cause this situation;
3: Diamond is excessively carbonized and the temperature is too high, which causes serious diamond carbonization. During the cutting process, the diamond particles are easy to fall off;
4: The segment formula design is unreasonable, or the sintering process is unreasonable, resulting in low strength of the working layer and the transition layer (or the working layer and the non-working layer are not tightly combined). Generally, this situation often occurs in new formulas;
5: The tool bit binder is too soft or too hard, resulting in disproportionate consumption of the diamond and metal binder, resulting in the diamond matrix binder not being able to hold the diamond powder.
The segment falls off
There are many reasons for the cutting head to fall off, such as too much impurities, too high or too low temperature, too short heat preservation and pressure holding time, inappropriate formula ratio, unreasonable welding layer, different working layer and non-working formula leading to the thermal expansion coefficient of the two Different, when the segment is cooled, shrinkage stress occurs in the working layer and the non-working connection, which will eventually reduce the strength of the segment, and finally cause the segment to fall off. These reasons are the reasons that cause the diamond bit to fall off or the saw blade to lose teeth. To solve this problem, we must first ensure that the powder is fully stirred evenly and free of impurities, and then match reasonable pressure, temperature, and heat preservation time, and try to ensure that the thermal expansion coefficient of the working layer and the non-working layer are close to each other.
During the processing of diamond segments, other problems may arise, such as excessive consumption, jamming, eccentric wear, etc. Many problems are not only the problem of the segment, but may be related to the machine, the type of stone, etc.
Post time: Jul-07-2021