V-shaped cutting deviation detecting method of circuit board

Abstract

The invention relates to a V-shaped cutting deviation detecting method of a circuit board. According to the V-shaped cutting deviation detecting method, a V-CUT deviation detecting hole drilling procedure is added to the hole drilling procedure in hole drilling process of the circuit board; and the V-CUT deviation detecting hole drilling procedure is arranged as follows: one or more V-CUT deviation detecting holes are drilled at each of two ends of each V-CUT line which is proposed to be cut in V shape and outside a formation line of a base plate of the circuit board before or after drilling the hole at the first time; and after the circuit board is formed, a V-CUT groove formed after cutting in the V shape is detected to determine whether the V-CUT groove is cut through the centre of circles of the V-CUT deviation detecting holes at two ends of the V-CUT line, if so, the cutting in V shape can be determined that the deviation not occurred thereto, and if not so, the cutting in V shape can be determined that the deviation occurred thereto. The diameter of a V-CUT deviation preventing hole is 0.8 to 1.0 millimeters. The distance from the V-CUT deviation detecting hole to the formation line is 1 to 2 millimeters. With the adoption of the method provided by the invention, the difficulty in V-CUT detecting can be reduced, the detecting timeliness can be improved, the short circuit phenomenon caused by non-removed V-CUT line can be prevented, and the V-CUT precision can be improved as well.

Description

technical field [0001] The invention relates to the technical field of circuit board manufacturing methods, in particular to a detection method for V-shaped cutting deviation of a circuit board. Background technique [0002] In the molding process, V-shaped cutting (V-CUT) is required on the circuit board. Since multiple V-CUT operations are required on the circuit board, the full-page V-CUT method is generally used to improve production efficiency. At present, to check whether the V-cut is offset, the main way is to check whether the V-CUT line designed on each PCS is removed, and if the V-CUT line is removed, it is regarded as not offset. But in actual operation, because the V-CUT line is formed by image transfer and manual alignment during the outer layer production, there is a phenomenon that the V-CUT line is offset due to film expansion and contraction or artificial alignment. The molding shape control is mainly based on the distance from the hole to the edge of the b...

AI Technical Summary

Problems solved by technology

However, in actual operation, because the V-CUT line is formed by image transfer and manual alignment during the outer layer production, there is a phenomenon that the V-CUT line is offset due to film expansion and contraction or artificial alignment.

The molding shape control is mainly based on the distance from the hole to the edge of the board. Therefore, if the V-CUT line is removed during the molding process as a criterion for judging whether the V-cut is offset, a single PCS out-of-tolerance will occur. Phenomenon

In addition, most of the existing V-CUT line design methods are to set V-CUT lines between each PCS and PCS, and there are dozens of V-CUT lines on each PNL board, and hundreds of places at most. The workload of visual inspection is heavy, the inspection time is slow, and the accuracy is low. It is easy to cause short circuit phenomenon due to V-CUT not being removed and missed inspection, resulting in quality hazards

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