PCB News - The use and fracture analysis of PCB gongs and knives

The use and fracture analysis of PCB gongs and knives

1. When drilling steel parts with PCB gongs, please ensure sufficient cooling and use metal cutting fluid.
2. Good drill pipe rigidity and guide rail clearance can improve the accuracy of drilling and the life of the drill bit
3. Please ensure that the magnetic base and the workpiece are level and clean.
4. When drilling thin plates, reinforce the workpiece, and when drilling large workpieces, please ensure the stability of the workpiece.
5. At the beginning and end of drilling, the feed rate should be reduced by 1/3.
6. For materials that have a lot of fine powder during drilling, such as cast iron, cast copper, etc., PCB gongs can use compressed air to help chip removal without using coolant.
7. Please remove the iron filings wound on the PCB drill body in time to ensure smooth chip removal.

After the blade of the PCB gong touches the grinding wheel, it should be ground from the main cutting edge to the back, that is, the cutting edge of the drill starts to touch the grinding wheel, and then slowly grinds down along the entire flank surface. When the drill bit is cut in, you can lightly touch the grinding wheel, first perform a smaller amount of sharpening, and pay attention to the uniformity of the sparks, adjust the pressure on the hand in time, and pay attention to the cooling of the bit., And to the edge annealing. When the cutting edge temperature is found to be high, the drill bit should be cooled in time.

Main reason analysis of PCB gong knife fracture

There are many reasons why PCB gongs break during work, but there are actually two basic directions. One is the fracture caused by improper operation and installation; the other is the fracture caused by poor quality and performance of PCB gongs.

1. Operation
1. The moving speed of PCB gongs and knives is too fast, which results in too high lateral impulse. Solution: appropriately reduce the movement speed (recommended) If you do not change the movement speed, increase the rotation speed appropriately (not recommended)
2. The moving speed of the PCB gong knife is normal, but the rotation speed is too low. Solution: Properly increase the rotation speed.
3. The blade diameter of PCB gongs is too thin and it is easy to break. Solution: When starting processing, start at the slowest speed (moving speed) and then gradually increase the final moving speed. It should not be too fast.
4. The installation of PCB gong knife is not standard, and the handle of the knife is exposed too long. Solution: install the tool in strict accordance with the requirements
5. The rotation speed of the PCB gong knife does not match the moving speed. Solution: Adjust the machine speed setting appropriately.
6. The tool structure and processing material characteristics of PCB gongs and knives do not match. Solution: switch to another type of PCB gong knife test.
7. Whether the PCB gong knife tool structure is worn or not. Solution: if the tool has been used for too long or worn out, replace with a new PCB gong knife.

2. In terms of performance and quality
1. The material of PCB gong knife is too poor. Solution Change another milling cutter to test

2. The chip removal ability of PCB gongs is poor, resulting in excessive resistance of the milling cutter when milling the PCB board and the cutting edge is broken. Solution: Change to another brand of milling cutter

In the process of using the PCB gong knife, as long as you operate the gong knife in strict accordance with the regulations, the probability of breaking the gong knife is generally relatively small under the premise that the gong knife has no quality problems.