CNC plane drill--details on the use of the drill bit

⒈The drill bit should be installed in a special packing box to avoid vibration and collision. CNC flat drill

2. When in use, the drill bit taken out of the packing box should be immediately installed in the spring collet of the spindle or in the tool magazine for automatically changing the drill bit. Put it back in the box immediately after use.

3. Measure the diameter of the drill bit with a non-contact measuring instrument such as a tool microscope to avoid injury caused by contact between the cutting edge and the mechanical measuring instrument.

4. Some CNC drilling machines use positioning rings, while some CNC drilling machines do not use positioning rings. For example, the depth positioning must be accurate when installing the retaining ring. If the retaining ring is not used, the extension of the drill bit mounted on the spindle should be adjusted. Multi-spindle drilling machines should pay more attention to this, so that the drilling depth of each spindle is consistent. If it is not consistent, the drill bit may drill into the countertop or fail to drill through the board, resulting in scrap.

5. The wear of the cutting edge of the drill bit can be checked with a 40 times stereoscopic microscope. CNC flat drill

6. The concentricity of the main shaft and the collet and the clamping force of the collet should be checked frequently. Poor concentricity will result in a small drill diameter and a large hole diameter. If the clamping force is not good, the actual speed is inconsistent with the set speed, and there will be slippage between the chuck and the drill bit.

⒎ The clamping length of the fixed shank drill on the spring chuck is 4 to 5 times the diameter of the drill shank.

8. Regularly check the spindle presser foot. The contact surface of the presser foot should be horizontal and perpendicular to the main shaft, without shaking, so as to avoid broken drill and partial hole during drilling.

⒐Drilling machine has a better vacuuming effect. The vacuuming wind can reduce the temperature of the drill bit, take away the dust at the same time, and reduce friction to generate high temperature.

⒑ The substrate layer includes the upper and lower backing plates, which should be firmly positioned in the one-hole-one-slot positioning system on the drilling machine table. When using tape, prevent the drill bit from sticking to the chip on the tape, resulting in difficulty in ejecting the chip and breaking the drill.

⒒ When ordering the drill bit from the manufacturer, when entering the factory for inspection, 4% of it should be randomly checked to see if it meets the regulations. And check the gaps, scratches and cracks with a microscope at 10 to 15 times.

⒓ Timely regrinding of the drill bit can increase the use of the drill bit and the number of regrinding, prolong the service life of the drill bit, and reduce the production cost and cost. Usually measured with a tool microscope, the wear depth should be less than 0.2mm. When regrinding, 0.25mm should be removed. Ordinary fixed shank drills can be reground 3 times, and undercut drills can be reground twice. Excessive grinding will reduce the drilling quality and precision, resulting in the scrapping of finished circuit boards. Excessive grinding is counterproductive. CNC flat drill

⒔ When the drill bit is scrapped, its wear diameter is reduced by 2% compared with the original due to wear.

⒕Drill bit parameter setting Generally speaking, the manufacturer provides a parameter table of the drilling speed and lower speed of the drill bit produced by the factory. This parameter is just a reference. In fact, the parameters of the rotational speed and downspeed of the drill bit are obtained according to the actual situation. Usually, the actual parameters differ from the reference parameters, but not too much.

⒖When grinding the drill bit, the two main blades of the twist drill should be ground symmetrically as much as possible to offset the radial force of the two main blades and prevent the deviation of the drill bit and the expansion of the hole diameter. CNC plane drill