PCB appearance processing introduction

Ožiljavanje PCB -a, obrada rupa i oblika može usvojiti metodu maskiranja matrice, za obradu jednostavnih PCB -a ili PCB -a sa ne baš visokim zahtjevima može se usvojiti metoda maskiranja. Suitable for the production of low level and large quantity PCB with not very high requirement and not very high shape requirement, with low cost.

Punch:

Production of large batch, the type and number of holes and complex shape of single-sided paper substrate and double-sided non-metallic hole epoxy glass cloth substrate, usually using one or several die punching.

Shape processing:

Printed board production volume large single panel and double panel shape, usually by die. According to the size of the printed board, it can be divided into upper and falling die.

Composite processing:

In order to shorten the manufacturing cycle and improve productivity, composite die is used to process the holes and shapes of single panel at the same time.

To process printed board with mold, the key is the design and processing of mold, which requires professional technical knowledge. In addition, the installation and debugging of mold are also very important. At present, most of the mold of PCB manufacturers are processed by external factories.

Mjere opreza pri postavljanju kalupa:

1. According to the die design calculation of blanking force, the size of the die, the closure height of the choice of press (including type, tonnage).

2. Start the punch, check the clutch, brake, slider and other parts are normal, the operating mechanism is reliable, there must be no continuous impact phenomenon.

3. The pad iron under the die, generally 2 pieces, must be ground on the grinder at the same time, to ensure that the die is installed parallel and vertical. Pad iron placement of the leap position that does not prevent material falling at the same time as close to the mold center.

4. Pripremite nekoliko kompleta vijaka za prešanje ploče i T-glave za prešanje za odgovarajuću upotrebu s kalupom. Prednji kraj ploče za prešanje ne smije dodirivati ​​ravnu stijenku donje matrice. Emery cloth should be placed between the contact surfaces and the screws must be tightened.

5. Prilikom postavljanja kalupa obratite pažnju na vijke i matice na donjoj matrici da ne dodiruju gornju matricu (gornja matrica pada i zatvara se).

6. Prilikom podešavanja kalupa, pokušajte koristiti ručni, a ne motorni.

7. In order to improve the blanking performance of the substrate, the paper substrate should be heated. Its temperature to 70 ~ 90℃ is the best.

The hole and shape of the die blanking printed board have the following quality defects:

Raised around the hole or the copper foil warped or layered; There are cracks between holes; Hole position deviation or hole itself is not vertical; Burr; Gruba sekcija; The printed board is warped into the bottom of the pot; Scrap jumping up; Waste jam.

The inspection and analysis steps are as follows:

Check whether the punching force and rigidity of the punch press are enough; Die design is reasonable, rigid enough; Konveksna, konkavna matrica i vodilica, postiže se preciznost obrade vodilice, instalacija je koncentrična, okomita. Whether the fit clearance is even. The gap between convex and concave is too small or too large to produce quality defects, which is the most important problem in mold design, processing, debugging and use. Convex and concave die edges are not allowed to be rounded and chamfered. Punch is not allowed to have taper, especially when punching both normal and inverted cones are not allowed. U proizvodnji uvijek trebamo obratiti pažnju na to je li rub konveksne i konkavne matrice istrošen. Ispusna usta su razumna, mali otpor. Push the material board, the material rod is reasonable, enough force. The thickness of the plate and the binding force of the substrate, the amount of glue, and the binding force of copper foil, heat and humidity and time are also factors to be considered in the analysis of blanking quality defects.