About the PCB Panel Separately Ways
Usually, inorder to improve the PCB assembly speed, usually ,ALLPCB to make in panel, espeically for a small size PCB, with much quantity.
Then what is the best way to cut pcb board? Or what is the correct tool to cut PCB material,finally getting a nice straight line? Many engineers will worry about this issue.
Punch cutting /Routing
When a printed circuit board is designed with other shapes or irregular contours besides rectangles, it is relatively quick and economical to use a punching die. The basic punching and cutting operation can be completed by using a puncher, whose cutting edge is neat and the effect is better than using a saw cutting or shearing machine. Sometimes, even punching and punching can be done at the same time. However, when good edge effect or small tolerance is required, punching and chaining do not meet the requirements. In the PCB industry, punching and cutting is generally used to cut paper substrate, but rarely used to cut epoxy glass substrate. Punching and cutting can make the cutting tolerance of printed circuit board within 0.1-o. 2mm. This is common way that ALLPCB use for small PCB.
Sawing is another method of cutting the substrate. Although the size tolerance of this method is similar to that of shear (0.3-0.5 RNRN), this method is preferable because the cutting edge is very smooth and neat. This is the most common used by ALLPCB.
In the PCB manufacturing industry, most of the circular saw cutting machines with movable worktable are used. The adjustable speed range of saw blade is 2000-6000r /rnin. But once the cutting speed is set, it cannot be further changed. It is achieved by a heavy pulley with more than one V band.
The diameter of the high-speed steel blade is about 3000rnrn, and it can cut paper steeling materials at the rate of 2000-3000r /rnin with approximately 1.2-1.5teeth per 1cm circumference. For epoxy glass substrate, use a tungsten carbide blade blade. The diamond wheel cuts better. Although it is expensive at the beginning, it is very useful for future work because of its long life and improved edge cutting.
The basic cutting method is suitable for all kinds of substrate, usually no more than 2mm thick. When the cutting board is more than 2mm, the cutting edge will appear rough and untidy, therefore, this method is generally not adopted.
The shear of laminate can be manual or electromechanical, whichever method has common features in operation. Shears usually have a set of adjustable shear blades, as shown in FIG. 10-1. Edge at the bottom of its blade is a rectangle, about 7 ° of the adjustable Angle, cutting length can be up to 1000 mm, longitudinal Angle between two blades usually had better choose in 1 ° — 1. 5 °, between epoxy glass substrate biggest can reach 4 °, the gaps between the two blades cutting edge to be less than 0.25 mm.
The Angle between the two blades is selected according to the thickness of the cutting material. The thicker the material, the greater the Angle required. If the shear Angle is too large or the gap between the two blades is too wide, the sheet will crack when cutting the paper substrate. However, for the epoxy glass substrate, due to the material's certain bending strength, it will deform even if there is no crack. In order to make the floor in the process of shearing edge tidiness, material can be heated in the range of 30-100 ℃.
In order to obtain a clean cut, the board must be firmly pressed down through a spring device to prevent any other unavoidable displacement of the board during shear. In addition, parallax can also lead to tolerance of 0.0.5 RNRN, which should be reduced to the minimum. The accuracy can be improved by using Angle marks.
The shears are capable of handling a variety of sizes and can provide accurate duplicate sizes. Large machines can cut several hundred kilograms of substrate per hour.