source:Industry News release time:2022-05-26 Article author:yu Popular:pcb
With the development of the electronic information industry, the refinement requirements of the automotive circuit board industry are getting higher and higher. At present, the accuracy of automotive circuit boards has developed to a minimum aperture of 0.08mm, a minimum hole spacing of 0.1mm or even higher. Drilling is an important link in the manufacture of automotive circuit boards. In addition to via holes and parts holes, there are also slot holes, special-shaped holes, and board shapes that need to be checked. How to efficiently and accurately detect the drilling quality of automotive circuit boards has become an important link to ensure product quality. The automotive circuit board hole inspection machine is an automatic optical inspection equipment used for drilling quality inspection.
In the drilling process of automotive circuit boards, it is necessary to mainly control the following quality problems that may occur: porosity, leakage, displacement, mis-drilling, incomplete penetration, hole damage, partial waste, batch peak, plug hole. At present, the management and control methods of various manufacturers are mainly to standardize the operation process of the drilling rig before drilling, and to strengthen the inspection methods after drilling. However, in the actual production process, since pre-drilling methods can only reduce the probability of errors, they cannot be completely eliminated, and post-drilling inspections must be used to ensure product quality.
In the post-drilling inspection, many domestic manufacturers are still using the plug gauge combined with the manual visual film (film) set inspection and comparison method: the plug gauge focuses on checking the large and small holes, and the film focuses on checking the porous, leaky, Displacement, non-penetration, non-penetration, and other hole damage, drape, hole plug, etc. are completed by manual visual inspection. When using film for inspection, a red film template is drilled first for each product, which is fixed to the product board by pins during inspection, and is manually inspected under the light box. This method can detect various defects in theory, but in practice, the effect is greatly discounted. The main problems are as follows:
Inspection requirements for small apertures cannot be guaranteed: Production practice shows that for automotive circuit boards with a minimum aperture of ≥0.5mm, manual inspection can achieve a higher inspection effect on the premise of ensuring a certain production efficiency. This is determined by the minimum recognizable viewing angle of the human eye, working distance, and attention span. With the reduction of the aperture size, the inspection ability of the human eye for product boards below 0.5mm decreases rapidly. For product boards ≤ 0.25mm, it is difficult to guarantee the quality of manual sampling inspection.
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