Teach you how to choose a drill bit for a multi-axis drilling machine

1.Choose a good brand to ensure production volume:

At present, there are many manufacturers of drill bits for multi-axis drilling machines, divided into domestic and imported. There is a slight gap between domestic products and foreign products. Of course, the price is also slightly more expensive. There are also produced in the market from Taiwan and Penigang, and some Taiwan-made drills with US and European brand drill bits. The quality of the drills imported from Taixi and Japan is stable.Although the price is slightly more expensive, it is good value for the craftsman. In the actual application process, the chances of problems that need to be answered due to the quality of the drill are very small. It is proposed to apply an inlet drill.Taixi’s drill is harder and Japan is softer.Taixi’s drill is more likely to be susceptible to eccentric holes but not broken during application. Japan’s drills are more flexible but hard to break but susceptible to eccentric holes Partial grid is a small drill. It can be selected according to requirements in the course of actual application.

2.Know the types and unique places of drill bits:

Drills for drilling printed boards include straight shank twist drills, fixed shank twist drills, and fixed shank undercut drills. Straight shank twist drills are mostly used for single-head drills. Simpler printed boards or single panels are drilled. Nowadays, they are rarely seen in large-scale board production plants, and their drilling depth can reach 10 times the drill diameter. In the environment where the substrates are not stacked, the application of the drill sleeve can avoid deviation. At present, most manufacturers use digitally controlled drilling machines. Digitally controlled drilling machines use hard alloy fixed shank drills. Its unique feature is that it can become an AUTO replacement drill. The positioning is fine and dense, and no drilling sleeve is required. Large helix angle, fast chip removal speed, suitable for high-speed grinding. In the full length of the chip flute, the diameter of the drill bit is an inverted cone, and the friction with the hole wall during drilling is small, and the drilling quality is high. Common drill shank diameters are 3.00mm and 3.175mm.

3. Pay attention to the material of the drill:

The drill bit for drilling of printed boards generally accepts cemented carbide, because epoxy glass cloth copper foil plate wears the cutting tools extremely fast. The so-called cemented carbide is made of tungsten carbide powder as a matrix and cobalt powder as a binder by increasing pressure and sintering. It contains 94% tungsten carbide and 6% cobalt. Because of its high hardness and very wear resistance, it has excellent strength and is suitable for high-speed grinding. But the toughness is very poor, and it is very brittle.In order to improve the performance of the cemented carbide, some accept a chemical vapor deposition on the carbonized substrate to deposit a layer of 5-7 micron ultra-hard titanium carbide (TIC) or titanium nitride (TIN) to make With higher hardness. Some use ion implantation technology to inject titanium, nitrogen, and carbon into their substrates at a good depth, which not only improves the hardness and strength, but also can migrate inward when the drill bit is reground. Another physical method is to create a layer of diamond film on top of the drill bit, which improves the hardness and wear resistance of the drill bit. The hardness and strength of cemented carbides are not only related to the ratio of tungsten carbide to cobalt, but also to the particles of the powder. The average size of tungsten carbide phase grains of ultrafine-grained carbide drills is less than 1 micron. This type of drill not only has high hardness, but also has improved compressive and flexural strength. In order to reduce the cost, many drill bits now adopt the welding shank layout.The original drill bits are hard alloys.Now the rear drill shanks adopt stainless steel. Carbide drills are exceptional in small diameters.