DE19749225A1 - Separating process for electronic circuit boards - Google Patents

Abstract

The process involves producing a number of printed circuit boards in one board (9) and are separated in a blanking operation. The individual boards have partial separation slots (11) . The tool is hook shaped (12) and is held in a reciprocating pneumatic drive (3) such that the bridging material (10) is removed.

Description

When manufacturing circuit boards, it is common to have a more number of printed circuit boards in one piece, so-called PCB use, to manufacture. Before or after loading pieces with electronic components become the individual PCBs then separated from each other. To do this, go to different separation processes known. The one according to the invention direction concerns a technology in which the individual Printed circuit boards are divided by continuous grooves and can only be held together by short connecting bridges. To the Separating the circuit boards, it is necessary to Ver connecting webs between the printed circuit boards without residues and separate gently. For this purpose, devices are known which preferably pneumatically driven and vertical in Matri zen movable, hook-shaped cutting knife.

Such a device is among others in the Unterla described in the utility model DE 297 07 050.9. To the A circuit board will separate from the top to the dimension trize that the cutting knife protrudes through a groove. There at is the PCB benefit with the Ver binding bridge pushed against the hook-shaped separating knife. The connec sau through the hook-shaped part of the cutting knife cut out about. So when removing the verb As far as possible, no remains remain on the bridges Width of the die gap and the thickness of the cutting knife be adapted to the respective groove width. From separation technology For reasons, however, it is necessary that between the separation knife and the parts of the Ma trize a certain cutting gap is present. There but preferably to drive the cutting knife Pneumatikzy linders are used whose pistons are not secured against rotation are, it can happen that the cutting knife in the Matri  zenspalt slightly twisted about its longitudinal axis. This allows the cutting edges of the knife hooks on the gap-forming channels the matrix. This leads to damage or to premature wear on the cutting knife and the die ze. Failure to comply with the respective cutting gap works also negatively affects the separation quality.

It is therefore an object of the invention to provide a simple device for the clean separation of printed circuit board benefits from the above to create a type that is not damaged and premature wear on the die and cutting knife comes and with which a constant separation quality can be achieved can.

This object is achieved by a device with the in the patent claim mentioned features solved.

The advantages achieved with the invention are in particular re in that no complex constructive measures for anti-rotation guidance of the piston are necessary because of the die gap set to the thickness of the knife shank ensures a safe guidance of the cutting knife.

An embodiment of the invention is in the drawings shown and is described in more detail below.

Show it

Fig. 1 is a side view of a device in partial section,

Fig. 2 is an enlarged detail according to section AA,

3 shows a front view from the left in FIG. 1.

A device 1 according to the invention consists of a pneumatic cylinder 2 with piston 3 receiving lower part 4 and an upper part 5. Inside the upper part 5 , the separating knife 6 is screwed to the piston 3 of the pneumatic cylinder 2 . The separating knife 6 has a knife shaft 11 and a knife hook 12 which has been formed on since. The cutting knife 6 protrudes through an opening in the upper part 5 and through the halves of the Matri 7 ; 8 formed die gap. The through the Ma trizenhälften 7 ; 8 formed die gap is set to the thickness of the knife shank 11 that a smooth but non-rotatable guidance of the cutting knife 6 is guaranteed. The knife hook 12 has a smaller thickness than the knife shaft 11 ( FIG. 2), so that when the knife hook 12 is immersed in the die gap, the cutting gap which is not necessary for separation is produced.

In Fig. 1 is a printed circuit board 9 halves 7 on the matrices; 8 , with a connecting web 10 abutting the knife shaft 11 of the cutting knife 6 . When the pneumatic cylinder 2 is switched on, the separating knife 6 moves downward and disconnects the connecting web 10 with its knife hook 12 . In Fig. 3 is visible as the knife shaft 11 between the die halves 7; 8 is performed. Due to the conical die gap widening downwards, the separated connecting webs 10 can then easily fall out of the die.

Reference list

1

contraption

2nd

Pneumatic cylinder

3rd

piston

4th

Lower part

5

Top

6

Cutting knife

7

;

8th

Die halves

9

PCB benefits

10th

Connecting bars

11

Razor shaft

12th

Knife hook

Claims (1)

Device for separating printed circuit board panels which have printed circuit boards divided by grooves and remaining connecting webs, the connecting webs being separated for separating the printed circuit boards with a separating knife which consists of a knife shaft and knife hook and which is movable in a die, characterized in that the knife hook ( 12 ) has a smaller thickness than the knife shank ( 11 ).