PCB Profile Blanking Considerations
Printed board material, holes and shape processing can be used in the mold blanking method, on the processing of simple PCB or not very high request PCB can be used in the blanking method. Suitable for low-level and high-volume request is not very high PCB and shape request is not very high PCB consumption, its cost is low.
Punching:Consumption of large batches, hole varieties and the number of complex shape of single-sided paper substrate and double-sided non-metallized holes in the epoxy glass cloth substrate, usually using a pay or a few pay mold punching.
Shape processing: Printed board consumption of large quantities of single-sided and double-sided board shape, usually using mold punching. According to the size of the printed board, can be divided into the upper drop mold and drop material mold.
Composite Processing: Printed board holes and holes, holes and shapes between the request for high precision, and at the same time in order to shorten the manufacturing cycle and improve the consumption rate, the use of composite molds to simultaneously process the holes and shapes of the single-panel.
Processing printed circuit boards with molds, the key is the design of the mold, processing, the need for professional and technical expertise, in addition to the mold device and debugging is also very important, most of the PCB consumer factory molds are processed by the outside plant.
Installation of the mold to pay attention to matters:
A. Select the punching machine (including type and tonnage) according to the punching force calculated by the mold design, the size of the mold, and the height of closure.
B. Start the press, comprehensively check the clutch, brake, slide and other parts of the normal, whether the operating mechanism can be secure, never even punch phenomenon.
C. Punch the die under the pad iron, ordinary 2 pieces, must be in the grinder at the same time grinding out, to ensure that the mold device parallel, vertical. Iron placed in the leap that does not prevent the drop at the same time to be as close as possible to the center of the mold.
D. To prepare several sets of pressure plate and T-shaped head pressure plate screws, in order to correspond to the use of the mold. The front end of the pressure plate can not touch the lower mold straight wall. Between the contact surface should be padded with sand cloth, screws must be tightened.
E. When installing the mold, we should pay great attention to the screws and nuts on the lower mold not to touch the upper mold (upper mold landing, closed).
F. Adjust the mold as far as possible with manual, not motorized.
G. In order to improve the punching performance of the substrate, the paper substrate to be given heat. Its temperature to 70 ~ 90 ℃ is good.
Mold punching the holes and shape of the printed board, the quality defects are as follows:
Hole around the raised or copper foil warping or delamination; holes and holes between the cracks; hole position bias or hole itself is not perpendicular; large burrs; section roughness; punching the printed board into the bottom of the pot-shaped warping; waste on the jump; waste infarcts.
The checking and analyzing steps are as follows:
Check the punching force of the punching machine, rigidity can be enough; mold design can be reasonable, rigidity can be enough; convex, concave mold and guide pillar, guide sleeve processing accuracy can be reached, the device can be concentric, vertical. Whether the matching clearance can be average. Convex, concave clearance is too small or too large will produce quality defects, is the mold design, processing, commissioning, the most important issue in the application. Convex and concave mold edge is not allowed to round, chamfer. Convex molds are not allowed to have taper, especially when punching holes, no matter whether it is a positive cone and inverted cone are not allowed. In consumption, we should always pay attention to whether the edge of convex and concave molds can be worn. Whether the discharge port is reasonable and low resistance. Whether the pusher plate and punching lever are reasonable and have enough force. The thickness of the punched sheet and the separation force of the substrate, the amount of glue, the separation force with the copper foil, the humidity and time of preheating are also factors to be considered when analyzing the quality defects of punching.
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