Diamond saw blade head technology selection 1 . The choice of diamond particle size When the diamond particle size is coarse and single particle size, the saw blade head is sharp and the sawing efficiency is high, but the bending strength of the diamond agglomerate is decreased. When the diamond particle size is fine or the coarse and fine particle sizes are mixed, the saw blade cutter head is durable. High, but low efficiency. Considering the above factors comprehensively, it is more appropriate to choose a diamond particle size of 50/60 mesh.
2. The choice of diamond distribution concentration is within a certain range. When the diamond concentration changes from low to high, the sharpness and sawing efficiency of the saw blade are gradually reduced, while the service life is gradually extended. However, if the concentration is too high, the saw blade becomes dull. With low concentration and coarse particle size, the efficiency will increase. The use of different parts of the cutter head in sawing, with different concentrations (that is, in the three or more layers of the middle layer can be used in lower concentrations), the middle of the cutter head work to form a middle groove, there are It helps to prevent the blade from swinging, thus improving the quality of stone processing.
3. The choice of diamond strength Diamond strength is an important indicator to ensure cutting performance. Excessively high strength will make the crystal unbreakable, the abrasive particles will be polished when used, and the sharpness will be reduced, leading to deterioration of the tool performance. When the diamond strength is not enough, it will be easily broken after being impacted, and it will be difficult to bear heavy cutting tasks. Therefore, the intensity should be 130 to 140N.
4. The choice of binder phase The performance of the saw blade depends not only on the diamond but on the overall performance of the composite head, which is a combination of diamond and binder. For soft materials such as marble, the mechanical properties of the cutter head are required to be relatively low, and a copper-based adhesive may be used. However, the copper-based binder has a low sintering temperature, low strength, hardness, high toughness, and low bonding strength with diamond. When tungsten carbide (WC) is added, WC or W2C is used as the skeleton metal, and appropriate amount of cobalt is added to improve the strength, hardness, and bonding properties, and a small amount of metals such as Cu, Sn, and Zn with low melting point and low hardness are used as bonding. phase. The particle size of the main ingredient should be finer than 200 mesh, and the particle size of the added ingredient should be finer than 300 mesh.
5. With the increase of temperature, the degree of densification of the carcass is increased and the bending strength is also increased. With the increase of the holding time, the bending strength of the blank carcass and diamond agglomerates increases first and then decreases. The 120s process can be optionally sintered at 800°C to meet the performance requirements.
The manufacture of diamond cutter heads In the cutter head manufacturing technique, the selection of the raw material for the cutter head body and the hot pressing process are among the key pivot points. Co-based alloys and bronze-based alloys have been widely used as raw materials for the carcass, but they cannot be used for manufacturing cost and function. The Fe-Ni-Cu-W alloy was used as the raw material for the cutter head body through horizontal analysis. Through trial and application, the ideal production cost and function were obtained.
The manufacturing process of the diamond saw blade head can be described as the sintering history of the metal powder under inevitable pressure. It is a powder metallurgy process: the uniform and complex metal powder at high temperature (800-1000°C) and constant pressure (180- 250Kgf/cm2), through a series of physical and chemical diffusing between powder particles, such as diffusion, welding, compounding, recrystallization, etc., to form a sintered body with an inevitable shape and machine function, which is a cutter head.
The basic requirements for the raw material of the saw blade head body must also be stricter:
1. The sintered body should have excellent slamming attack function and proper hardness in order to ensure that the wrapped diamond forms a perfect machine meshing and moderate wear-resistant means to the rock;
2. The powder metallurgy process that meets the above-mentioned performance requirements can be completed at a lower sintering temperature (as usual not to exceed 950°C) and a shorter holding time (as usual not to surpass 5 minutes) to slow the diamond single crystal The trend of deterioration;
3. The alloy component in the carcass alloy can be used to infiltrate the diamond single crystal, and through the trace element intervening to make the chemical bonding between the alloy component and the diamond, further improve the method of using diamond.
The powder metallurgy method allows the carcass raw material to obtain a structure similar to that of the ordinary alloy and achieve alloying. There are many kinds of phases in the alloy structure, in which the alloy is biased toward the eugenic natural solid solution phase between the electrochemical elements and the atomic radius similar components. Because the crystal lattice of the solid solution phase is distorted during the natural course, the resistance to the crystal lattice dislocation increases, so that the strength and hardness of the raw material are improved, that is, the solid solution strengthens the impregnation, and the solid solution phase becomes The composition of the most basic components of higher raw materials is required for the synthesis of machine functions. It can be said that the formation of a solid solution phase in the carcass alloy is one of the keys to achieving high performance of the carcass material.
In accordance with the requirements of the foundation of the raw material of the saw blade head, the alloy that is easy to form a solid solution phase in the carcass alloy and gestates to produce a solid solution strengthening infusion is used as the foundation of the carcass, and the Fe-Ni-Cu-W alloy is suitable. This requirement:
Fe-Ni, Cu-Ni can be completely miscible;
WC/W-Ni, WC-Cu, and Fe-Cu can achieve limited miscibility and can give rise to diffusion-strength impregnation;
Fe and Ni Group VIII elements have excellent affinity for diamond.
The finished cutter head is mounted on the base body in a variety of different ways. After being polished and sprayed to make a finished product, it is widely used in various types of life production operations.
2. The choice of diamond distribution concentration is within a certain range. When the diamond concentration changes from low to high, the sharpness and sawing efficiency of the saw blade are gradually reduced, while the service life is gradually extended. However, if the concentration is too high, the saw blade becomes dull. With low concentration and coarse particle size, the efficiency will increase. The use of different parts of the cutter head in sawing, with different concentrations (that is, in the three or more layers of the middle layer can be used in lower concentrations), the middle of the cutter head work to form a middle groove, there are It helps to prevent the blade from swinging, thus improving the quality of stone processing.
3. The choice of diamond strength Diamond strength is an important indicator to ensure cutting performance. Excessively high strength will make the crystal unbreakable, the abrasive particles will be polished when used, and the sharpness will be reduced, leading to deterioration of the tool performance. When the diamond strength is not enough, it will be easily broken after being impacted, and it will be difficult to bear heavy cutting tasks. Therefore, the intensity should be 130 to 140N.
4. The choice of binder phase The performance of the saw blade depends not only on the diamond but on the overall performance of the composite head, which is a combination of diamond and binder. For soft materials such as marble, the mechanical properties of the cutter head are required to be relatively low, and a copper-based adhesive may be used. However, the copper-based binder has a low sintering temperature, low strength, hardness, high toughness, and low bonding strength with diamond. When tungsten carbide (WC) is added, WC or W2C is used as the skeleton metal, and appropriate amount of cobalt is added to improve the strength, hardness, and bonding properties, and a small amount of metals such as Cu, Sn, and Zn with low melting point and low hardness are used as bonding. phase. The particle size of the main ingredient should be finer than 200 mesh, and the particle size of the added ingredient should be finer than 300 mesh.
5. With the increase of temperature, the degree of densification of the carcass is increased and the bending strength is also increased. With the increase of the holding time, the bending strength of the blank carcass and diamond agglomerates increases first and then decreases. The 120s process can be optionally sintered at 800°C to meet the performance requirements.
The manufacture of diamond cutter heads In the cutter head manufacturing technique, the selection of the raw material for the cutter head body and the hot pressing process are among the key pivot points. Co-based alloys and bronze-based alloys have been widely used as raw materials for the carcass, but they cannot be used for manufacturing cost and function. The Fe-Ni-Cu-W alloy was used as the raw material for the cutter head body through horizontal analysis. Through trial and application, the ideal production cost and function were obtained.
The manufacturing process of the diamond saw blade head can be described as the sintering history of the metal powder under inevitable pressure. It is a powder metallurgy process: the uniform and complex metal powder at high temperature (800-1000°C) and constant pressure (180- 250Kgf/cm2), through a series of physical and chemical diffusing between powder particles, such as diffusion, welding, compounding, recrystallization, etc., to form a sintered body with an inevitable shape and machine function, which is a cutter head.
The basic requirements for the raw material of the saw blade head body must also be stricter:
1. The sintered body should have excellent slamming attack function and proper hardness in order to ensure that the wrapped diamond forms a perfect machine meshing and moderate wear-resistant means to the rock;
2. The powder metallurgy process that meets the above-mentioned performance requirements can be completed at a lower sintering temperature (as usual not to exceed 950°C) and a shorter holding time (as usual not to surpass 5 minutes) to slow the diamond single crystal The trend of deterioration;
3. The alloy component in the carcass alloy can be used to infiltrate the diamond single crystal, and through the trace element intervening to make the chemical bonding between the alloy component and the diamond, further improve the method of using diamond.
The powder metallurgy method allows the carcass raw material to obtain a structure similar to that of the ordinary alloy and achieve alloying. There are many kinds of phases in the alloy structure, in which the alloy is biased toward the eugenic natural solid solution phase between the electrochemical elements and the atomic radius similar components. Because the crystal lattice of the solid solution phase is distorted during the natural course, the resistance to the crystal lattice dislocation increases, so that the strength and hardness of the raw material are improved, that is, the solid solution strengthens the impregnation, and the solid solution phase becomes The composition of the most basic components of higher raw materials is required for the synthesis of machine functions. It can be said that the formation of a solid solution phase in the carcass alloy is one of the keys to achieving high performance of the carcass material.
In accordance with the requirements of the foundation of the raw material of the saw blade head, the alloy that is easy to form a solid solution phase in the carcass alloy and gestates to produce a solid solution strengthening infusion is used as the foundation of the carcass, and the Fe-Ni-Cu-W alloy is suitable. This requirement:
Fe-Ni, Cu-Ni can be completely miscible;
WC/W-Ni, WC-Cu, and Fe-Cu can achieve limited miscibility and can give rise to diffusion-strength impregnation;
Fe and Ni Group VIII elements have excellent affinity for diamond.
The finished cutter head is mounted on the base body in a variety of different ways. After being polished and sprayed to make a finished product, it is widely used in various types of life production operations.
Caiyuan Reflecting Material Co., Ltd. , http://www.cnreflecting.com