The key to processing PCB printed boards with molds is the need to design and process molds with professional technical knowledge. In addition, the installation and commissioning of molds is also an important part.

The punching machine (including type, tonnage) is selected according to the punching force calculated by the mold design, the size of the mold, the closing height, and the like.

Start the punching machine, comprehensively check whether the clutch, brake, slider and other parts are normal, the operating mechanism is reliable, and there is no continuous rush.

The horn under the die is generally two pieces, which must be ground at the same time on the grinding machine to ensure that the mold is installed parallel and vertical. The placement of the horn does not hinder the blanking while being as close as possible to the center of the mold.

Several sets of platen and T-head platen screws are to be prepared for use with the mold. The front end of the platen cannot touch the straight wall of the lower die. An abrasive cloth should be placed between the contact surfaces and the screws must be tightened.

When installing the mold, pay great attention to the screws and nuts on the lower mold. Do not touch the upper mold (the upper mold is lowered and closed).

Manually adjust the mold as much as possible without maneuvering.

In order to improve the punching performance of the substrate, the paper substrate is preheated. The temperature is preferably 70 to 90 °C.

Hole and shape quality defects:

When punching: the periphery of the hole is raised or the copper foil is warped or layered; there is a crack between the hole and the hole; the hole position is biased or the hole itself is not vertical;

Large burr

Rough section

The punched printed board is warped in the bottom of the pan;

Jump on the scrap;

The waste is clogged.

the reason:

Whether the punching force and rigidity of the punching machine are sufficient;

Whether the mold design is reasonable and whether the rigidity is sufficient;

Whether the processing precision of the convex and concave molds, the guide post and the guide sleeve is reached, and whether the installation is concentric or vertical. Whether the fit clearance is uniform.

If the gap between the convex and concave is too small or too large, quality defects will occur, which is the most important problem in mold design, processing, debugging and use.

The convex and concave die edges are not allowed to be rounded and chamfered. The punch is not allowed to have a taper, especially when punching, neither the forward cone nor the inverted cone. Attention should be paid to the wear of the convex and concave cutting edges at all times during production.

Whether the discharge opening is reasonable and the resistance is small. Pusher plate, the material is reasonable and the force is sufficient.

The thickness of the plate to be punched, the bonding strength of the substrate, the amount of glue, the bonding force with the copper foil, the preheating humidity and time are also factors to be considered in the analysis of the quality defects.