As a metallographic engineer, my daily work starts with metallographic cutting!


Whether it is using a grinding wheel metallographic cutting blade or a diamond metallographic cutting blade, you may encounter situations where the cutting blade becomes dull after a few uses, or becomes unusable after a short period of use, either it cannot be cut, or the blade is broken. How can you give these metallographic cutting pieces a chance to survive? The metallographic engineer for pulse detection, commonly known as Zhou Ka, said: "To prolong the life of metallographic cutting pieces, these methods must be known!

1、 Must use coolant


Metallographic cutting requires the use of cutting coolant, which has two main functions.


1. During the cutting process of the sample, the high-speed rotation of the cutting blade and the intense friction and impact on the sample surface will generate a large amount of heat on the cutting surface. Only by continuously spraying the cooling liquid can the large amount of tropical heat generated by the cutting be continuously removed, keeping the cutting blade and the sample cutting surface within an acceptable temperature range, and preventing heat from being absorbed by the cutting blade due to overheating, resulting in graphitization of the blade, It may also cause thermal deformation of the steel substrate of the metallographic cutting piece, ultimately leading to the inability of the metallographic cutting piece to function properly. Moreover, insufficient cutting cooling can also cause sample burns due to heat. Therefore, metallographic cutting must use cutting coolant for cooling and achieve sufficient cooling, otherwise it will directly affect the service life of the metallographic cutting blade.


Another function of using coolant is to timely flush chips and impurities away from the cutting edge. After the spraying system in the cutting room is activated, the coolant rushes towards the incision with a certain pressure, which will separate a large amount of material chips and carry them away with the water flow, effectively reducing the secondary wear of the chips on the metallographic cutting blade. This is also the function of using coolant to prolong the life of the metallographic cutting blade.

2、 Control the speed of the metallographic cutting blade:


In the actual operation of metallographic cutting, the speed of the metallographic cutting blade has a significant impact on its lifespan. If the speed is too low or too high, it will accelerate the wear of the metallographic cutting blade and also affect cutting efficiency.


1. Low speed: During cutting, the contact time between the cutting edge of the metallographic cutting blade and the material will correspondingly increase, exacerbating friction, increasing heat, and correspondingly increasing loss.


2. Excessive rotation speed: Within a unit time, the cutting depth of the metallographic cutting blade decreases, and the friction and wear of the material on the blade decrease. However, the load of the interaction between the blade and the material increases, and the loss of the blade under mechanical impact increases, which will inevitably lead to increased wear and tear.


Therefore, whether the speed of the metallographic cutting blade is too low or too high, it will affect its service life. In practice, it is necessary to control the speed of the cutting blade according to the technical instructions provided by the manufacturer or the appropriate speed summarized through experiments in order to maintain the service life of the metallographic cutting blade. In addition, engineers suggest that in actual operation, the speed of feed, retract, and discharge should be appropriately slowed down, and the speed during the cutting process should be kept uniform, especially during manual operation, paying attention to these details.

3、 Reasonable selection of metallographic cutting pieces


The selection principle for the application of metallographic cutting pieces is&ndash& Flash; Cut hard to soft, cut soft to hard, and cut hard to hard. Reasonable selection should be made based on the physical properties of the sample material to be cut, especially paying attention to the manufacturer's instructions. Each model of metallographic cutting blade will have detailed instructions, and selecting the right one can ensure that the cutting quality, efficiency, and service life of the sample meet the expectations.

By mastering these methods, you can extend the lifespan of your metallographic cutting piece. For more details, please consult an engineer at Kemai Testing.