With the development of electronic information industry, terminal electronic products have higher and higher requirements for the refinement of PCB khoebo. Ho cheka ke mohato oa bohlokoa tlhahisong ea PCB, e ntlafalitsoeng ho fihlela bophara ba lesoba bo tlase ba 0.08mm, sebaka se seholo sa lesoba sa 0.1mm kapa le ho feta. Ntle le ho tsamaisa likoti, likoti tsa likarolo, li-grooves, likoti tse nang le sebōpeho se khethehileng, sebopeho sa poleiti, joalo-joalo, kaofela li hloka ho hlahlojoa. Mokhoa oa ho lemoha boleng ba ho cheka ha boto ea PCB ka nepo le ka nepo e fetohile sehokelo sa bohlokoa ho netefatsa boleng ba lihlahisoa. Mochini oa ho hlahloba likoti tsa PCB ke sesebelisoa sa tlhahlobo sa othomathike se sebelisoang tlhahlobong ea boleng ba ho cheka. Sepheo sa pampiri ena ke ho sekaseka mosebetsi oa mochine oa ho hlahloba likoti ts’ebetsong ea ho cheka le ho fana ka phihlelo ea litšupiso bakeng sa baetsi ba PCB.

Ts’ebetsong ea ho cheka PCB, hoa hlokahala ho laola mathata a latelang a boleng bo ka khonehang: porosity, leakage, displacement, ho cheka ho fosahetseng, ho se kenelle, ho lahleheloa ke lesoba, litšila, pele, lesoba la plug. 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:

Ntlha ea pele, litlhoko tsa tlhahlobo ea aperture e nyenyane li ke ke tsa tiisetsoa: tloaelo ea tlhahiso e bontša hore bakeng sa PCB e nang le bonyane ≥0.5mm, buka ea tataiso e ka finyella liphello tse phahameng tsa tlhahlobo tlas’a motheo oa ho netefatsa katleho e itseng ea tlhahiso. This is determined by the minimum discernable visual Angle of the human eye, the working distance, and the attention span. Ka ho fokotseha ha boholo ba aperture, bakeng sa poleiti ea sehlahisoa e ka tlase ho 0.5mm, bokhoni ba ho hlahloba mahlo a motho bo tla fokotseha ka potlako, bakeng sa poleiti ea sehlahisoa ≤0.25mm, bukana esita le boleng ba sampling bo thata ho netefatsa.

Ea bobeli, katleho ea ho hlahloba ka letsoho e lekanyelitsoe: katleho ea ho hlahloba ka letsoho e amana ka ho toba le palo ea likoti le bonyane ba ho bula. 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. Bakeng sa poleiti e phahameng ea density, ho ke ke ha khoneha ho netefatsa boleng ba ho cheka ka letsoho.

Ntlha ea boraro, botsitso ba boleng bo ke ke ba tiisetsoa: batho ba tla angoa ke phihlelo, maikutlo, mokhathala, boikarabelo le lintlha tse ling, ho thata ho netefatsa botsitso ba boleng. 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. Haholo-holo bakeng sa likhoebo tse tšehelitsoeng ka lichelete tsa Majapane le Taiwan, lilemo tse ngata tsa boikoetliso li pakile katleho ea mokhoa ona o mocha, o lokelang ho ela hloko le ho buuoa ke bahlahisi ba bangata ba lehae ba PCB.

Thepa ea ho hlahloba masoba ea AOI ke ea lisebelisoa tsa tlhahlobo ea othomathike ea optical. Ho ea ka mofuta oa setšoantšo sa mefokolo e fapaneng ea ho cheka, e ka aroloa ka: porous, lesoba le fokolang, lesoba le leholo, lesoba le lenyenyane, le setseng, ho kheloha ha lesoba le sebopeho sa lesoba. E arotsoe ka mefuta e ‘meli: e’ ngoe ke mochini oa ho hlahloba Hole, e ‘ngoe ke Hole measurement le mochini oa ho hlahloba (hole-AOI). Ha e le hantle, ho boetse ho na le mochine oa tlhahlobo oa X-ray, o sebelisoang haholo-holo bakeng sa ho hlahloba masoba a patiloeng a foufetseng le liboto tse nang le lihlopha tse ngata, tse sa lumellaneng le sepheo sa tlhahlobo ea baki ea filimi ‘me ha se karolo ea tlhahlobo ea pampiri ena.

Ho ea ka phihlelo ea lisebelisoa tsa baetsi ba PCB, ho kgothaletswa ho sebelisa lihlopha tse ngata tsa mochine oa ho hlahloba sekoti bakeng sa tlhahlobo e feletseng ea poleiti ea pele le poleiti e ka tlaase, ho lebisa tlhokomelo ho hlahloba likoti, likoti tse seng kae, likoti tse kholo, likoti tse nyenyane le lithōle; Mochini o lekanyang le ho hlahloba boemo ba lesoba o sebelisetsoa ho hlahloba letheba, o shebane le ho kheloha lesoba. 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. Bothata ke hore bokhoni ba ho hlahloba boemo ba sekoti ha bo phahame, ‘me ke liphoso tse tebileng feela tse ka fumanoang. Ho latela boiphihlelo ba ‘nete ba tlhahiso ea moetsi, hangata li-RIGS tse 15 li na le mochini o le mong oa ho hlahloba lesoba.

Mochini oa ho lekanya le ho hlahloba boemo ba lesoba: molemo ke hore lintho tsohle li ka hlahlojoa. Bothata ke hore theko e phahameng (hoo e ka bang 3 ~ 4 linako tsa mochine oa ho hlahloba sekoti), katleho ea ho hlahloba e tlaase, ho nka metsotso e ‘maloa kapa nako e telele ho hlahloba sengoathoana se le seng. 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:

Ntlha ea pele, tlhahlobo e sebetsang hantle le e tsitsitseng ea boleng ba ho cheka:

Tlhahlobo ea kamehla: sekoti se senyenyane, se senyenyane, sekoti se seholo, sekoti se senyenyane le likoli tsa litšila li ka hlahlojoa ka nako e le ‘ngoe ka lebelo la bonyane ba 0.15mm le 8m / min,’ me sebaka se nang le sekoli se tšoauoa ‘me setšoantšo sa sekoli se hlahlojoa ho fana ka motheo oa kahlolo ea matsoho. .

Debris inspection: in the first drilling inspection, debris is not the focus of the most attention; Empa pele ho electroplating, litšila li lokela ho baka tlhokomelo e lekaneng. E le ho fokotsa tšusumetso ea lithōle boleng ba pula ea koporo, baetsi ba PCB ka kakaretso ba tlosa lithōle ka ho sila le ho hloekisa pele ho electroplating, empa ha e le hantle, e ntse e sa hloeka ka 100%, phello ea ho hloekisa poleiti e phahameng haholoanyane e mpe le ho feta. 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.

Taba ea bobeli, thusa mafapha a tlhahiso le boleng ho tlhahlobo ea lipalo-palo:

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.

Tlhahlobo ea bokhoni: e ka bokella bokhoni ba tlhahiso ea letsatsi le letsatsi, khoeli le khoeli, kotara le selemo le karolelano ea katleho ea tlhahiso, ea fana ka lintlha tsa tlhahlobo bakeng sa mekhoa e fapaneng ea taolo, le ho ntlafatsa ts’ebetso ea feme le bokhoni ba taolo.

Tlhahlobo ea mochini: e ka bala sephetho, mathata a fapaneng le boleng ba rig ka ‘ngoe, ea ntlafatsa bokhoni ba ho laola lintlha tsa mochini.

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.

Ka litlhoko tse phahameng tsa boleng ba baetsi ba PCB bakeng sa ts’ebetso ea ho cheka, tlas’a khatello ea ho eketseha ha litšenyehelo tsa basebetsi le bokhoni ba ho hlahloba butle-butle bo sa lekaneng, bohlokoa ba mochine oa ho hlahloba likoti bo ntse bo bonahala haholoanyane.

Tšebeliso ea mochine oa ho hlahloba sekoti e bile lilemo tse fetang leshome, ts’ebetso le ts’ebetso ea lisebelisoa li ‘nile tsa ntlafatsoa kamehla,’ me tekanyo ea tšebelisano-‘moho le tlhahiso e ntse e atamela haholoanyane. Haholo-holo ka tsoelo-pele e potlakileng ea boto e phahameng, mochine oa ho hlahloba likoti o fetotsoe butle-butle ho tloha lisebelisoa tsa pele tse thusang ho ba lisebelisoa tsa bohlokoa tse tšehetsang. 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.