Milling technology of CNC drilling machine: The milling technology of circuit board CNC drilling machine includes selecting the direction of the cutting, the compensation method, the positioning method, the structure of the frame, and the lower cutting point. It is an important aspect to ensure the accuracy of milling. 1, the direction of the knife, compensation method: When the milling cutter cuts into the sheet, one of the cut faces always faces the cutting edge of the milling cutter, while the other side always faces the cutting edge of the milling cutter. The former has a smooth surface and high dimensional accuracy. The spindle always rotates clockwise. Therefore, whether it is the CNC fixed table movement or the CNC milling machine that fixes the spindle movement, it is necessary to use the counterclockwise movement when milling the outer contour of the plate. This is what is commonly referred to as up-cut milling. The milling method is adopted when milling the frame or the groove inside the circuit board. The milling plate compensation is the automatic setting of the machine tool when milling the board, so that the milling cutter automatically sets half of the diameter of the milling cutter with the center offset of the milling line, that is, the radius distance, so that the milling shape and program setting be consistent. At the same time, if the machine has compensation function, it must pay attention to the direction of compensation and the command to use the program. If the compensation command is used, the shape of the circuit board will be more or less equivalent to the length and width of the diameter of the milling cutter. 2. Positioning method and undercut point: The positioning method can be divided into two types: one is internal positioning, and the other is external positioning. Positioning is also very important for process developers. Generally, the positioning plan should be determined when the board is pre-made. Internal positioning is a common method. The so-called internal positioning is to select a mounting hole in the printed board, a plug hole or other non-metallized hole as a positioning hole. The relative position of the holes is such that the large diameter holes are selected on the diagonal and as much as possible. Metallized holes cannot be used. Because the difference in the thickness of the plating in the hole will affect the consistency of the positioning hole you select, and it is easy to cause the plating damage in the hole and the edge of the hole surface when taking the plate. The number of pins is less under the condition of ensuring the positioning of the printed board. The better. Generally, the small board uses 2 pins, and the large board uses 3 pins. The advantage is that the positioning is accurate, the shape of the board is small, the precision is high, the shape is good, and the milling speed is fast. The disadvantages of the various aperture types in the board need to be prepared with pins of various diameters. If there are no positioning holes available in the board, it is necessary to discuss with the customer in the pre-production, and it is more cumbersome to add positioning holes in the board. At the same time, different management of the milling plate templates of each type of board is troublesome and costly. External positioning is another positioning method, which uses a positioning hole on the outside of the board as a positioning hole for the milling board. The advantage is that it is easy to manage. If the pre-production specifications are good, the milling board templates are generally around fifteen. Due to the use of external positioning, the board cannot be cut and cut at one time, otherwise the circuit board is very easy to damage, especially the board, because the milling cutter and the dust collecting device will bring the board out to cause the circuit board to be damaged and the milling cutter to be broken. In the method of segment milling and leaving the joint point, the first milling plate is paused after the milling plate is finished and then the plate is fixed with tape. In the second stage of the program, the joint is drilled using a drill bit of 3 mm to 4 mm. The utility model has the advantages that the template has less cost and is small and easy to manage, and can cut and cut all the circuit boards without mounting holes and positioning holes in the board, and the small craftsman has convenient management, especially the production of the CAM and other pre-production personnel can be simplified, and the substrate can be optimized at the same time. Utilization. The disadvantage is that due to the use of the drill bit, the shape of the circuit board is left with at least 2-3 raised points, which may not meet the requirements of the customer, the milling time is long, and the labor intensity of the worker is slightly larger. 3. Frame and undercut point: The manufacture of the frame belongs to the premature production of the circuit board. The frame design not only has an influence on the uniformity of the plating, but also has an influence on the milling plate. For example, if the design is not good, the frame is easily deformed or a small block is generated when the board is milled. Small waste blocks, the generated waste blocks will block the dust suction pipe or break the high-speed rotating milling cutter, and the frame deformation, especially when the external positioning of the milling plate is caused, causes the deformation of the finished plate, and the lower cutting point and the processing sequence are selected well, so that the frame can be made. Keep the maximum strength at the fastest speed. If the choice is not good, the frame is easily deformed and the printed board is scrapped. 4, milling process parameters: The shape of the board is milled with a carbide milling cutter, and the cutting speed of the milling cutter is generally 180 to 270 m/min. The calculation formula is as follows (for reference only): S=pdn/1000(m/min) where: p:PI(3.1415927);d: milling cutter diameter, mm; n: milling cutter speed, r/min; matching the cutting speed is the feed speed. If the feed rate is too low, the material of the printed board is softened or even melted or burnt due to the frictional heat, and the chip flute of the milling cutter is blocked, and the cutting cannot be performed. If the feed is too fast, the cutter wears quickly, the radial load is large, the cutter is large, the work quality is poor, and the dimensions are inconsistent. How to judge the speed of feed? Consider the following items: printed board material, thickness, number of stacks, iron knife diameter, chip flutes. Generally, it can be set according to the technical data provided by the tool supplier. Due to the difference between the material quality brand and the manufacturing process of the tool, the tool process parameters of different manufacturers are different. The spindle motor speed can only be maintained below the rated load. The load increases and the speed drops until the cutter breaks. There are several situations in which the problem of broken tools is generated when milling the board: One: The spindle motor has insufficient power and needs to be repaired and replaced. Second: the number of plates per plate is too large, the cutting load is too large or the milling length exceeds the effective length of the milling cutter. Three: quality problems of milling cutters. Four: Speed ​​and feed speed setting problems. Five: The clamping force of the drill chuck of the rotating shaft is reduced, and the required rotation speed is not reached when the load is taken. Six: There is a problem with the concentricity of the rotation of the shaft to cause a jump. Seven: There is a problem with the design of the program, such as using the wrong command. Lighting Pole,Lamp Pole,Solar Street Light Pole,Street Light Pole China Searun Solar Solution Co., Ltd. , https://www.srsolarlights.com