Drilling is a particularly complicated machining process. and it becomes much more complicated when the workpiece printed circuit boards (PCBs). PCB is composite materials with anisotropy. Even a small defect in PCB may cause great losses. Both the drilling process and PCB structure design. have been researched by many scholars. But the investigations into the drilling processes of PCB are not systematic.
tool materials and geometrics, cutting force, cutting temperature. radial run-out and damages occurring in drilling processes. challenges in analysis and optimization for PCB drilling. Introduction In recent years, the production of printed circuit boards (PCBs). has not only increased in quantity but also improved in quality. The high packaging density of PCB required to be improved and miniaturized. For instance. the downsizing of televisions. and telephones has made it possible to change. these from stationary to portable devices. Thus, high-quality micro-machining is necessary for PCB.
The basic materials forming a board are an epoxy glass mix. made by impregnating rolls of woven glass cloth with resin. and sheets of copper foil which are used to make the electrical connections . A typical board may have many alternate layers of epoxy glass and copper foil. manufactured by squeezing in a large hydraulic press. The board will not become a circuit until connections . are made between the different copper layers. and when the discrete electrical components are soldered or welded in place. Thus, through hole drilling is one of the fundamental processes required. in the manufacture to produce an electrical connection . between the circuits on the board.
Drilling is a particularly complicated machining process. and it becomes much more complicated when the workpiece is PCB. PCB is composite materials with anisotropy. Tool trends to wear and break. The accuracy of hole location, the presence of entry. and exit burrs, smear of resin on the sides of holes, delamination and so on may affect quality of boards. Only a small one of these defects may cause great losses.
pcb material types
When high performance is not an essential PCB characteristic. a material like lightweight polyester is a good choice. There are at least two reasons to select lightweight polyester under these circumstances. as long as it’s used in conjunction with printed electronics (PE) technology.
The benefits of PE with lightweight polyester include:
Lower cost. Lightweight polyester creates less waste, requires fewer processing steps. and reduces need for water treatment and filtration.
Versatility. Flexible printed circuits (FPCs) are available. but it’s expensive to achieve the level of “bendability” that makes them so attractive. PE with lightweight polyester retains the flexibility at a much lower price.
But, traditional PCBs are still the first choice for high-performance applications. and the decision about which materials to use in their creation. should based on the kind of board required. For example, will the board:
Handle frequencies between 500MHz and 2GHz
Accommodate high power and, thus, high temperatures
Be complex and “dense?
Manage frequencies at the microwave level and above
The board’s application determines, to a large extent. which materials to use in substrates and laminates.
There are three major types of materials used for fabrication of PCBs:
This is the most used material in PCBs. It is a glass reinforced epoxy laminate sheet. The epoxy used is flame retardant and water resistant. It provides good strength to weight ratios. The tensile strength offered by this material is very high.
PTFE is a kind of plastic material that does not provide any resistance. thus used for high speed, high frequency applications. PTFE is flexible, making it invaluable in applications with tight tolerances. It is also lightweight, allowing it to used across various industries. It is also flame resistant, exhibits high physical strength, provides temperature stability. and is versatile in application.
The traditional materials of copper, aluminum, iron, etc. are still used in PCBs. These materials allow the use of Surface Mount Technology (SMT). for the integration of components. They also provide mechanical durability. Thus, the product life of metal base PCBs is much longer.
The different materials used for the PCB design and fabrication. all offer a variety of advantages and disadvantages. The material chosen according to the application, the result needed. environmental factors, and any other constraints the PCB will face. You should choose the material of the PCB depending on the results that expected.
entry board - pcb sheet material
Entry Board for PCB drilling/ Phenolic Drill Entry Board material . constructed of layers of kraft papers impregnated with modified phenolic resin. It is the most cheap entry board material.
Entry Board is a composite of the Melamine paper and wooden fiber board with high density. It is especially made to replace the Phenolic backing board.
Entry Board is difficult to distort. The warping degree is smaller than the same size of Phenolic board.
Entry Board reduces the abrasion of the drill and lengthens the life of micro drill bits.
Entry Board can save the cost and it has more sizes.
Entry Board doesn’t pollute the environment.
Drilling burr in PCB production is indispensable process. and it can't avoided for either electro-connection among layers or fixing elements.
The formation of pcb drilling burrs affects the PCB quality. and ends up in deburring processes. The burrs created from drilling processes is onerous to get rid of. and also the price of deburring is often large.
step-down of burr occurred in drilling method will scale back effort and time to get rid of burr. so the opening drilling and deburr method square measure. thought-about as necessary processes to save lots of energy.
Since burr formation associated with method conditions and drill pure mathematics. experiments were dole out to develop a Drilling Burr management Chart. by variable feed, spindle speed. and drill diameter and backup board material.
it tested that choose high density and hardness backup board . may be a sensible approaches to attenuate drilling burrs. and to green the PCB drilling method.
backup board for PCB - back up material
Back Up Board is a paper-base laminate with low phenolic resin content for hard, flat surfaces. This material used in the printed circuit board industry. as a backup for the drilling operation. It is also used in other industries for tooling stock because of. its ease of machining and good dimensional stability.
circuit board drill entry and backup board ,as a pcb board material . used for the PCB drilling process with high grade. and precise grade,Base material with HDF board ( high density wood fiber )of pine tree,willow tree. eucalyptus tree and poplar tree et. Top laminate with white melamine paper phenolic resin.
the inner layers of this backup material: high density fibre board . available two density option as 830kg/m3 and 880kg/m3.
backup material feature
TAGS: xray drill. laser drilling. pcb assembly. pcb fabrication. copper foil. . aspect ratio. inner layer. copper layers. pcb design.copper clad. layer pads. aluminium entry. entry foil. laser drills. leaded components. dc motor. electronic components. laser beam. .
1. Circuit board drill backup board Have a certain surface hardness (reach to 80+-2 shore). to ensure that the machine drills bit removal chip to keep the drill holes wall clear. and reduce the drilling burr, but not too hard and wear the drill bit to protect the pcb driller.
2. drilling printed base material made of wood fibre. which has no resin composition, and this drill bed. does not produce the melting resin ball adhering to the holes wall. when high speed mechanical drilling.
3. this printed circuit exit material has certain heat conduction function. which takes away the heat generated during board drilling. reduces the high temperature of the drill bit during speed drilling. and prevents annealing of the drill bit.
4. Ideal exit material for high precision pcb manufacturing. Material uniformity, less impurities, no metal impurities. in line with ROHS standards.
5. Thickness tolerance of this product controlled within (+0.15mm) to . avoid frequent change of drilling machine bit height during pcb panels drilling.
6. pcb hole size can within 0.3mm.The performances of drilling holes are. higher than those of non-professional rotary perforated wood fiberboard. medium density PN wood fiberboard. high density PS wood fiberboard and resin wood fiberboard. which are close to phenolic pcb board. drill size. drill diameter can less than 0.3mm
7.pcb board custom service such as drills registration holes,cut to size also provide for back drill pcb.
pcb sheet material factory - yueshan
Yueshan is one of Yueshan most experienced custom PCB entry board. and backuo board service supplier. With the idea that our success measured by our clients' success. we focus on the care and attention to detail that each PCB manufacturing step requires. We also offer vacuum packaging, weighing. and delivery to make sure your PCB entry baord and back up board
order arrives. and free of damage. Up to now, we have entry baord and back up board
of all sizes from over 80 countries. and we aim to deliver our manufactured entry baord. and back up boardto every corner of this world in the coming years.
We specialize in providing PCB entry baord and back up board for our PCB customers.
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