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The importance of the transition of the diamond saw blade and the detection of the segment unloading the die
Publish Date:2020-03-11
The diamond saw blade is composed of a base and a segment. The nodal block consists of impregnated diamond layer and transition layer, as shown in the figure below. The transition layer is a pure matrix layer, which does not contain diamond. It is used to connect the diamond impregnated layer and braze the diamond impregnated layer on the substrate through the transition layer. Therefore, good welding performance is also required. The poor performance of the transition house will cause the segment to fall off from the base under the action of high alternating stress, thus affecting the safety of the saw blade.Generally, the transition layer materials can not contain low melting point metals, such as Sn, Zn and other elements, because these elements are easy to evaporate and vaporize at high temperature and produce pores. Co, Ni and some alloy materials are usually used in the formulation of transition layer. Although WC can increase the wear resistance of the weld and the transition layer, high content of WC will lead to defects such as cavities and slag inclusions, and even brittle fracture. In order to solve this contradiction, adding a small amount of Mn and Cr in the transition layer material can not only produce solution strengthening, increase wear resistance, but also reduce porosity. In addition, if the components of the cutting layer and the transition layer are too different, they are easy to fracture at the junction of the two layers due to the uneven thermal stress.
Quality inspection must be done after the head is sintered to check the quality of sintering. The quality inspection of the diamond segment produced by the hot pressing method includes:
1. Observe whether the shape is combined to make single requirements, that is, the graphite mold is not wrong, and each segment is required to observe;
2. Use vernier caliper to measure whether its length, thickness and height meet the requirements. The general causes of oversize include: the pressure is too small or the temperature is too low, the pressure position is not flattened; the pressure head is installed wrongly, the height of the upper pressure head is too small; the pressure head strength is low or the installation is skewed, and the pressure head is broken during the pressurization process. The reason for the small size of the segment is similar to it, generally because the upper head is too high or the upper and lower heads are installed; if the size of the segment is too large or too small, it will be burned, processed or scrapped according to the actual situation; the same type of segment can also be welded on the same pair of saw blades.
3. Calculate the loss of sintering and the density of the segment by weighing with a pharmaceutical balance. Generally, the weight consumption is not more than 7-8%.
4. The hardness value of the cutting head with the hardness tester is usually Rockwell hardness tester, which can measure the HRB and HRC values. Different saw blades have different requirements for the hardness of the segment. For example, the hardness of marble saw blade head is required to be over hrb65, granite saw blade head is required to be over hrb75, and concrete saw blade is required to be over hrb90.
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