With the development of electronic information industry, terminal electronic products have higher and higher requirements for the refinement of PCB industry. Drilling is an important step in PCB manufacturing, which has been developed to the minimum hole diameter of 0.08mm, the maximum hole spacing of 0.1mm or even higher level. In addition to conducting holes, parts holes, grooves, special-shaped holes, plate shape, etc., all need to be checked. How to detect the drilling quality of PCB board efficiently and accurately has become an important link to ensure the quality of products. PCB hole inspection machine is just an automatic optical inspection equipment used in the quality inspection of drilling. The purpose of this paper is to analyze the function of hole testing machine in drilling process and provide reference experience for PCB manufacturers.

MuPCB yekuchera maitiro, zvinodikanwa kudzora anotevera emhando matambudziko: porosity, kuvuza, kutama, kuchera zvisiri izvo, kusapinda, kurasikirwa kwegomba, tsvina, kumberi, plug gomba. At present, the control methods of various manufacturers are mainly to standardize the drilling process before drilling and strengthen the inspection means after drilling. In actual production, because the pre-drilling method can only reduce the probability of error, can not completely eliminate, we must rely on post-drilling inspection to ensure product quality.

In the post-drilling inspection, many domestic manufacturers are still using the plug gauge combined with artificial visual film (film) set inspection method: through the plug gauge focus on checking the hole, hole small, through the film focus on porous, leaky hole, shift, not through, not through, other hole damage, front, hole plug through artificial visual to complete. In the use of film inspection, each product drilling drill out a red film sample, inspection through the pin and product plate fixed, manual visual inspection under the light box. In theory, this method can detect all kinds of defects, but in practice, the effect is greatly discounted.

The main problems are as follows:

Chekutanga, zvinodiwa zvekuongorora zveaperture diki hazvigone kuvimbiswa: maitiro ekugadzira anoratidza kuti kune PCB ine shoma aperture ≥0.5mm, bhuku rekushandisa rinogona kuwana yakakwirira yekuongorora mhedzisiro pasi pechisimbiso chekuona humwe hunyanzvi hwekugadzira. This is determined by the minimum discernable visual Angle of the human eye, the working distance, and the attention span. Nekudzikira kwesaizi yeaperture, yeplate yechigadzirwa pazasi 0.5mm, kugona kwekutarisa kwemaziso emunhu kuchakurumidza kuderera, kune chigadzirwa ndiro ≤0.25mm, bhuku remanyorero kunyangwe sampling mhando yakaoma kuona.

Second, the efficiency of manual inspection is limited: the efficiency of manual inspection is directly related to the number of holes and the minimum aperture. The actual production experience shows that the efficiency will be significantly reduced when the hole is more than 10000 and the smallest hole is less than 0.5mm. Manual inspection is only suitable for sampling. Kune yakakwira density plate, hazvibviri kuvimbisa kunaka kwekuchera nemanyorero.

Chechitatu, kugadzikana kwehutano hakugone kuvimbiswa: vanhu vachabatwa neruzivo, mafungiro, kuneta, mutoro uye zvimwe zvinhu, zvakaoma kuvimbisa kugadzikana kwehutano. Some manufacturers can not use multiple artificial, repeated inspection method, but still can not ensure the stability of quality.

In order to solve the above problems, many LARGE PCB factories have adopted hole inspection AOI equipment to replace manual labor in a large range. Especially for Japanese and Taiwan-funded enterprises, many years of practice has proved the effectiveness of this new method, which is worth the attention and reference of many domestic PCB manufacturers.

Midziyo yekuongorora gomba yeAOI ndeye automatic optical inspection equipment. Zvinoenderana nechimiro chechimiro chekukanganisa kwakasiyana kwekuchera, inogona kukamurwa kuita: porous, gomba shoma, gomba rakakura, gomba diki, rakasara, gomba kutsauka uye chimiro chegomba. It is divided into two kinds: one is Hole inspection machine, the other is Hole measurement and inspection machine (hole-AOI). In practice, there is also an X-ray inspection machine, which is mainly used for the analysis of buried blind holes and multi-layer boards, which is inconsistent with the objective of manual film jacket inspection and does not belong to the analysis scope of this paper.

Maererano nePCB vagadziri ‘midziyo inoenderana ruzivo, zvinokurudzirwa kushandisa akawanda seti yegomba rekutarisa muchina kuti uongorore zvizere ndiro yekutanga uye pasi ndiro, kutarisa kuongororwa kwemakomba, maburi mashoma, makomba mahombe, maburi madiki nemarara; Chinzvimbo chekuyeresa uye chekutarisa chinzvimbo chegomba chinoshandiswa kutarisisa nzvimbo, inotarisa pakutsauka kwegomba. The characteristics of the two devices are as follows:

Hole checking machine: the advantages are low price, fast inspection efficiency, check a 600mm×600mm PCB average of 6~7 seconds, can realize the porous, less hole, hole, small hole, residual inspection. Izvo zvisingabatsiri ndezvokuti kukwanisa kutarisa nzvimbo yegomba haisi yakakwirira, uye kukanganisa kwakakomba chete kunogona kuonekwa. Zvinoenderana nehunyanzvi hwekugadzira chaiyo yemugadziri, kazhinji gumi neshanu maRIGS ane 15 gomba rekutarisa muchina.

Hole position measuring and checking machine: the advantage is that all items can be checked. The disadvantage is that the price is high (about 3~4 times of the hole inspection machine), the inspection efficiency is low, it takes several minutes or even longer to check 1 piece. It is generally recommended to configure one machine for product sampling inspection to supplement the deficiency of hole checking machine for hole position inspection.

Inspection principle of hole inspection AOI equipment: PCB drilling image is collected by optical system, and compared with the design document (drill tape file or Gerber file). If the two are consistent, it indicates that the drilling is correct; otherwise, it indicates that there is a problem in the drilling, and then analyze and classify the defect type according to the image morphology. The hole inspection equipment is compared with the design documents of drilling, and the manual visual inspection is compared with the film. In terms of the inspection principle, the problems caused by the film drilling errors can be avoided, and the reliability is higher.

PCB hole testing machine technology analysis

The role of hole checking machine on PCB drilling process is reflected in the following aspects:

Chekutanga, inoshanda uye yakagadzikana yekuchera mhando yekuongorora:

Kuongorora kwechinyakare: porous, shoma porous, gomba hombe, gomba diki uye marara akaremara anogona kuongororwa panguva imwe chete nekumhanya kweashoma aperture 0.15mm uye 8m/min, uye nzvimbo yakakanganisika yamaka uye chifananidzo chakakanganisika chinoongororwa kuti chipe manyorero ekutonga. .

Debris inspection: in the first drilling inspection, debris is not the focus of the most attention; Asi pamberi pe electroplating, marara anofanira kukonzera kutarisa kwakakwana. Kuti uderedze pesvedzero yemarara pamhando yekunaya kwemhangura, vagadziri vePCB vanowanzo bvisa marara nekukuya uye kuchenesa pamberi pe electroplating, asi mukuita, haisati yachena 100%, iyo yakanyanya kukwirisa density plate yekuchenesa mhedzisiro yakaipa. Theoretically, there are scraps in every PCB, so it is impossible to fully inspect all the holes on all products, relying on manual visual inspection, but the hole inspection machine makes it possible.

Quality improvement: stability is the biggest advantage of equipment, stable product quality can enhance the brand influence of PCB factory, directly improve the ability of manufacturers to receive orders.

Chechipiri, batsira madhipatimendi ekugadzira uye emhando mu data statistical analysis:

Tool analysis: it can analyze the average deviation of drilling hole diameter of different drilling tools in PCB, monitor the possible drilling tool wear in real time, find the wrong tool problem in time, and avoid batch waste plates.

Capacity analysis: it can collect daily, monthly, quarterly and annual production capacity and average production efficiency, provide analysis data for various control methods, and improve factory operation and management ability.

Kuongorora kwemuchina: inogona kuverenga kuburitsa, akasiyana uye emhando matambudziko ega rega rega, kuvandudza kugona kubata iwo mameseji emuchina.

Third, cost saving, high input-output ratio:

Inspection personnel: on the premise of ensuring quality and improving efficiency, 2~3 inspection personnel can be saved on average by a hole inspection machine.

Raw material: it can save the material cost of film, which is more meaningful for medium and small batch factories.

Customer complaint: it can save the cost of return order and fine caused by drilling defects. Although it is not as direct as the personnel and materials saved, the average annual cost saved is even higher than the purchasing cost of hole inspection machine.

With PCB manufacturers’ higher quality requirements for drilling process, under the pressure of increasing labor cost and gradually inadequate manual inspection ability, the importance of hole inspection machine is becoming increasingly obvious.

Kushandiswa kwegomba rekuongorora muchina kwave nemakore anopfuura gumi, basa uye kushanda kwemidziyo yave ichivandudza nguva dzose, uye dhigirii rekubatana nekugadzirwa kuri kuwedzera uye pedyo. Kunyanya nekukurumidza kusimudzira kwepamusoro-density board, gomba rekuongorora muchina wakashandurwa zvishoma nezvishoma kubva kune yekutanga yekubatsira michina kuita kiyi inotsigira midziyo. In the equipment transformation of many PCB old plants and the preparation of new plants, the popularity of hole testing machine equipment will be more and more high.