1. Drilling parameters: The setting of drilling parameters is very important. If the drilling speed is too fast, the drill bit will break due to excessive force. Too slow drilling speed will reduce production efficiency. Because the board thickness, copper thickness, and structure of PCB boards produced by various board material manufacturers are different, the PCB needs to be set according to the specific conditions. Through calculation and testing, select the most suitable drilling parameters. Generally, for a drill bit of 0.3mm, the cutting speed should be 1.5-1.7m/min, and the drilling depth should be controlled between 0.5-0.8. 2. The backing plate and the backing plate used for drilling of aluminum sheet require moderate hardness, uniform thickness, flatness, and the thickness difference should not exceed 0.076mm. If the backing plate is irregularly distributed, it is easy to jam the drill tip and the backing plate is uneven. It will make the pressure foot not press tightly, which is the twist and break of the drill bit, and the plate will also move with it during the up and down movement of the drill bit. The drill bit will break due to the unbalanced force when the tool is returned. Its function: (1) Suppress the occurrence of burrs in the holes. (2) Fully penetrate the PCB board. (3) Lower the temperature of the drill tip and reduce the broken drill. The aluminum sheet used for drilling must have a certain rigidity to prevent the plate from shaking when the knife is lifted, and it must have corresponding elasticity. The drill bit becomes soft immediately when the drill is in contact with the drill bit. The drill bit is precisely aligned with the position to be drilled, and the drill bit will not deviate from the original hole position and cause the bit to break. The role of aluminum sheet: 1. Prevent burrs and scratches on the PCB surface. 2. Play the role of heat dissipation and drill bit cleaning. 3. The drill can be guided to drill into the track of the PCB board to improve the accuracy of drilling. The aluminum sheet requires a large thermal conductivity, so that the heat generated during drilling can be quickly taken away, and the temperature of the drill bit should be reduced. You should try to use 0.15-0.2mm thick aluminum sheet or 0.15-0.35mm aluminum alloy composite aluminum sheet, which is effective Prevent the drill tip from breaking due to poor chip removal due to high temperature during drilling. 3. The quality of the copper clad sheet material. The thick glass fiber cloth of the sheet material and the poor bonding force will also have a greater impact on the broken drill nozzle. If the plate resin is not completely polymerized, it is easy to produce more slag on the hole wall, poor chip removal and break the drill tip. If there is a cavity in the substrate, the drill bit will be broken due to uneven force during drilling. Therefore, the sheet must be baked before drilling. Baking time is generally 4 hours/150oC±5oC 4. When using drills, drills with different functions must be selected according to the processing purpose, product hole wall quality requirements, and uses. The main types of drills are 1: ST type (straight drill) 2: UC type (under cut drill) 3: ID type (inverse drill), currently the most commonly used is the ST type, suitable for paper, epoxy paper, phenol Double-sided board with epoxy glass and other board materials and PCB board with four layers or less. The characteristic of the UC drill tip is that the diameter below the tip is smaller than the diameter above the head (that is, the head is larger and the body is smaller). The design principle is to reduce the friction with the hole wall during the drilling process to prevent the hole wall from being too thick and broken. needle. It is very important to choose a supplier with timely delivery, stable quality and perfect after-sales service. 5. Machine performance During the drilling process, the drilling rig must be in a stable and accurate state. Due to the vibration of the drilling machine, the vibration of the spindle and the large runout, poor COLLET design or debris, Z axis lost motion, poor dust removal, poor (X, Y) axis movement, etc., all cause the drill tip to break, so it must be based on the PCB The board factory's own customer groups and product structure choose to use drilling rigs with good performance. Under normal circumstances, the height difference between the highest and lowest point of the machine flatness is required SPINDLE dynamic runout 6. The operating environment has higher requirements for 5S in the production workshop, reducing the presence of dust. Machine marble countertops and beams should be cleaned with alcohol for daily maintenance. keep clean. The temperature of the operating room is controlled between 20oC±2oC to ensure that the machine works in an adapted environment, ensuring quality and the life of the CNC drilling rig. Dust Explosion Proof Motor,Explosion Proof Induction Ac Motor,Special Explosion-Proof Motor,Dust Explosion Protection Motors Yizheng Beide Material Co., Ltd. , https://www.beidevendor.com