PCB CNC Drill

PCB drill is mainly used for the manufacture of PCB drilling, CNC mill's general PCB drilling drill types are as follows: Straight shank twist drill, twist drill set shank and fixed handle Spade (undercut) drill bit. Straight shank twist drill mostly for single head machines, drilling relatively simple single-panel or PCB, is now rarely seen in a large circuit board manufacturing plant in its drilling depth of up to 10 times the drill diameter. In the laminate substrate is not high, to avoid the use of the drill bit holder side. Currently, most manufacturers use CNC drilling machine, CNC drilling using a carbide shank drill set, which features a can automatically replace the drill bit. High positioning accuracy without the use of drill sets. Large helix angle, chip speed, suitable for high-speed cutting. In the full length of the flute, is an inverted cone drill diameter when drilling a small hole wall friction, high quality of drilling. Common drill shank diameter 3.00mm and 3.175mm.

Good PCB carbide drill with good quality materials with high rigidity, high precision holes, good hole wall quality, long life and other fine features, and now introduce the drill material: PCB drilling is generally used with a drill carbide, glass cloth epoxy complex because copper plate on the tool wear quickly. The so-called carbide is tungsten carbide powder as matrix, cobalt powder as a binder by pressing, sintering. Generally contain 94% tungsten carbide, 6% cobalt. Because of its high hardness, very wearable, there is a certain strength, suitable for high-speed cutting. But poor toughness, very brittle, cemented carbide in order to improve performance in some of the carbide substrate using chemical vapor deposition of a layer of 5-7 microns of titanium carbide special hardware (TIC) or titanium nitride (TIN), to having a higher hardness. Some ion implantation technology, titanium, nitrogen, and carbon into a certain depth of its base, not only improves the hardness and strength but also when injected into the drill regrinding these ingredients can move into. There are physical methods used to generate a layer of diamond film on top of the drill, drill greatly improves the hardness and wear resistance. Hardness and strength of cemented carbide, tungsten carbide and cobalt, and not only the ratio, but also with particles about. Carbide drill ultra fine particles having an average grain size of the tungsten carbide phase in less than 1 micron. This drill is not only high hardness and compressive and flexural strength have increased. In order to save costs now handle many drill welded structure as a whole is the original carbide drill, drill now rear handle with a stainless steel, greatly reduced the cost of using different materials but due to its dynamic concentricity of less than a whole hard alloy drill, especially in terms of small diameter.

1. Use the drill: a drill bit should be packed in special packing boxes, to avoid vibration collide.

2. When using, remove the drill bit from packing boxes to be fitted to the spindle collet that is ahead or automatic replacement drill tool library. Then run back into packing boxes.

3. drill diameter measurement tools to use microscopes and other non-contact measurement equipment, to avoid the cutting edge in contact with the mechanical gauges were bruised.

4. Some CNC drilling using some CNC drilling positioning ring retainer ring is not used, such as the use of its depth positioning positioning ring installed must be accurate, as it does not use retaining ring fitted to the drill spindle elongation to adjust consistent, multi-spindle drilling machine to pay attention to this point, to make each spindle drilling depth to be consistent. If it is not possible to make the drill bit to drill or not to drill through the table caused the circuit board scrap.

5. to 40 times the usual stereo microscope can be used to check the drill cutting edge wear.

6. Always check the concentricity of the clamping force of the spindle and collet and collet chuck, the concentricity bad cause small diameter drill and drill off the large aperture, etc., the clamping force is not good cause actual speed settings speed is not met, the slip between the chuck and drill bit.

7 will handle the drill head in the spring clamping length of the drill shank 4 to 5 times the diameter to clamp securely.

8. Should always check the spindle presser foot. To contact surface of the presser foot level and vertical spindle can not shake off the drill to prevent drilling produced and partial holes.

9. Drilling suction effect is better, vacuum air temperature can reduce the drill while away the dust reducing friction heat.

10. substrate stack comprises upper and lower plate to be positioned firmly in the drilling of a hole in a workbench trough positioning systems, flat. The need to prevent the use of adhesive tape on the drill bit so that the adhesion tape drill cuttings, causing difficulties and chip off the diamond.

11. Ordered manufacturers drill, when the factory inspection to sampling its 4 percent compliance. And 100% with a 10 to 15 times its microscopic examination gaps, scratches and cracks.

12. drill timely regrinding, increase the use and re- drill grinding times, extending bit life, reduce production costs and expenses. Commonly used measurement tool microscope, the two main cutting edge in total length, wear depth should be less than 0.2mm. When regrinding to be rubbed 0.25mm. Plain shank drill can be reground three times, shovel -shaped head (undercut) can be reground drill 2 times. Excessive grinding turn their quality and precision drilling will decline, the finished product will cause the circuit board scrap. Excessive turning mill counterproductive.

13. when the wear due to abrasion and which is reduced in comparison with the original diameter of 2%, the drill scrapped.

14. drill set parameters under normal circumstances, manufacturers have to provide a drill bit factory production speed and lower -speed drilling parameter table, this parameter is only for reference, but also through the actual use of the technology staff to draw a line with drill speed and speed parameters under actual conditions, usually with reference to the actual parameters of the parameters are different, but not too much difference.

Currently, a lot of drill manufacturers, domestic and import points. Domestic products and foreign products compared to a slight gap between the prices of imports also slightly more expensive of course, the market is also produced by the Taiwan and Hong Kong, as well as some of Taiwan's production hit the U.S. and European brands of drill bits, compared to the use of Europe Japanese imports of drill stability and quality, although the price is slightly expensive but it is good value for money for craft workers in the actual use of the process due to the probability of the problem occurring is very small drill quality, such as the products require a higher recommended the use of imported drill, Europe's higher hardness drill softer Japan, Europe and the drill rather break than bend using partial holes are not prone to breaking, but the higher the probability of some flexibility compared to the Japanese finally broken drill drilling prone to bias, but especially small holes bias drill. In the course of actual use can be selected according to requirements.