How to make a diamond segment?
In the tricks of making heads, the selection of raw materials and the hot-pressing process of the cutter heads are among the key pivotal 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 segment 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 capability and proper hardness in order to ensure that the wrapped diamond forms an excellent machine mesh and moderate wear resistance 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 exceed 5 minutes) to slow the diamond single crystal The trend of deterioration;
3. The alloy components in the carcass alloy can be used to infiltrate the diamond single crystals, and the trace elements contained in the carcass alloy can cause chemical bonding between the alloy components and the diamonds, further improving the method of using diamonds.
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 types of phases in the alloy structure, in which the alloy is biased towards 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 dislocations increases, so that the strength and hardness of the raw material are improved. That is, the solid solution strengthens the impregnation, so that the solid solution phase becomes The composition of the most basic components of the raw materials 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, which will give rise to solid solution strengthening and impregnation, should be selected as the foundation of the carcass. 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 grinding and painting, the finished product is widely used in various types of life production operations. Process to meet performance requirements.