assemblage de circuits imprimés: Chine TOP services de fabrication de pcbaPublié le 2020-05-18
assemblage de circuits imprimés: 2020 Chine TOP services de fabrication de pcba
assemblage de circuits imprimés boards in short PCBs are electronic gadgets used to mechanically give support to electronic gadgets that have connection cables inserted to copper inserts surface fixing applications or holes in a plate, to weld the ends of the gadgets. In hole applications, a plate can have all through hole components on the top side or component, a mixture of through hole and surface mount only on the top side, a mixture of through holes and surface mount components on the top side and components surface mount. On the bottom or circular side, or surface mount components on the top and bottom sides of the plate.
The plates are also used to electrically connect the conductors required for each element with copper conducting traces. The component pads and connecting strips are engraved from laminated copper sheets on a non-conductive substrate. printed circuit assembly boards are designed as single-sided with shims and copper strips on only one side of the board, front and back with copper rails and strips on the top and bottom sides of the LED pcb board, or multiplayer designs with rails and strips of copper.
Types of printed circuit boards:
One- or two-sided plates consist of a core dielectric, like FR-4 fiberglass epoxy material, which has copper insulator on both or one of the sides. This copper coating is shaped like a finger to form the copper engravings and the actual connecting strokes on the plate surfaces as part of the manufacturing process. A multilayer plate consists of several layers of dielectric material that have been impregnated with adhesives, and these layers are used to separate the layers from the copper coating. All of these layers are aligned and then joined into a single plate structure under heat and pressure. Multi-story boards with 48 or more layers can be produced using current technologies.
In a four-layer design, inner layers are used to give power and earth connection, for instance a ground level layer and + 5V level layer as two inner layers, with all other connections circuit and component made from above which also include the bottom layers of the board. Highly complex board designs can be layered to make the various connections of several voltage sizes, earth connections or to connect the many conductors in ball grid board devices and other large forms of integrated circuits.
There are generally two types of material used to build a multiplayer board. The pre-impregnated material consists of thin layers of glass fiber pre-soaked with a tail and is leaf-shaped, usually about 0.002 inches thick. The core is made similar to a thin and double-sided plate, which contain a dielectric material, with copper layer deposited on every side like epoxy glass fiber, mostly 0.030 thick dielectric with a copper layer 1 materials ounce on every side. In a multi-layer board, there are two methods used to build the desired number of layers. The core stacking method, which is an older technology, uses a central layer of pre-impregnated material with a layer of core material on top and another layer of core material below. This combination of a pre-impregnated layer and two main layers would form a 4-layer plate.
The film stacking method, a more recent technology, would have the core material as the central layer, followed by layers of pre-impregnated material and copper, embedded above and below to form the final number of layers required by the board. This method allows the flexibility in manufacturing how combinations with thick layers are combined to meet the thickness requirements of the finished product, varying the number of prefabricated sheets in each layer. After the layers of material are finished, the entire pile is subjected to heat and pressure, which causes the tail in the pre-impregnation to connect the core and pre-impregnated layers in a single entity.
The printed circuit assemblycircuit board manufacturing process follows the steps below for most applications:
Basic steps for the manufacture of printed circuit boards:
Configuration – the process of determining materials, processes and requirements to meet customer specifications for the board design based on Gerber information provided by the purchase order.
Engraving – the traditional process of exposing copper and other unprotected areas of the small head resists the film with a chemical that removes the unprotected copper, leaving the copper engravings and traces protected in place; newer processes use tiny plasma / laser instead of chemicals to remove copper material, allowing for more refined line definitions.
Figuring – the process of transferring Gerber dosing data to a layer in a tin-resistant film that is placed on the conductive copper layer.
Drill – the process of drilling all holes for coating through applications; a second drill is used for holes that do not need to be covered. Information on the location and size of the holes is in the drilling file.
Galvanization – the process of applying a copper ceiling to pillows, rails and perforations through holes that need to be covered; the plates are placed in a copper bath with electric charge.
Second drill – this is necessary when drilling holes in a copper area, but the hole must not be inserted. Avoid this process, if possible, as it increases the cost of the finished board.
Routing – the process of separating multiple tables from a panel of identical tables; this process also allows you to cut flies or cracks in the board, if necessary.
Screen printing – the process of applying component markings and component traces on the plate. It can be applied only on the upper side or on both sides if the components are mounted on the upper and lower sides.
Finishing – the process of covering the areas of the cushion with a thin layer of solder to prepare the board for the eventual undulation of the fusion process or reflux of the fusion, which will occur later after the placement of the components.
Quality Control – visual inspection of the panels; it can also be the process of inspecting the quality of the wall for coatings through holes in multilayer plates by cross section or other methods.
Electrical test – the process of checking continuity or shortened connections on the plates, applying voltage between various points on the plate to determine whether the current is occurring. Depending on the complexity of the board, this process may require a test device and a test program specially designed to integrate with the electrical test system used by the board manufacturer.
Advantages of printed circuit boards
The process of creating a printed circuit board for a small business can be time-consuming. A great way to simplify the process and prepare the relevant parts for manufacturing is to use professional service. This can help not only create a clean and efficient board, but also save time and detect factory problems as quickly as possible. Let’s take a look at some of the benefits of using a professional service:
The ability to use a professional service will save a lot of time for some companies that want to create a prototype for a new product. To build the self-construction of the printed circuit, it will be necessary to come into contact with various parts and assembly. The extra time to save on outsourcing can be used elsewhere, which is especially useful in a company with only a few employees.
An important advantage of using this type of service is the ability to create a high quality plate with experienced level welding. Many of the professional boards use the most impressive silk screening methods, welding resistors and blades. Professional service is most effective with arrangements that have many surface-mounted components. The ability to use automatic component placement will result in greater accuracy and less risk of producing a defective board. Also with the tiny items located very close, the latest machines are the most reliable option for precise welded joints.
The ability to use a professional service will help to calculate costs for the various stages of the manufacturing process. After the prototype has been built and the design and layout confirmed for future production, it will be possible to obtain a fee to carry out small or high volume production to meet the specific need.
A professional service will effectively note any errors that may appear in the process of creating the printed circuit board. The ability to create a prototype is a useful way of knowing whether there is likely to appear an error during the manufacturing of the product. If the errors can be foreseen in advance, they can help to save resources, time and effort. In addition, if the errors are discovers they can help in creation of future projects within good practices.
The manufacture of printed circuit boards can be done for a limited number of circuits or for mass production. You just need to choose a PCB manufacturing company with a proven tracker. You need to analyze the importance of the PCB. And consider the quick steps to buy and use it. There are many ways to satisfy your desires. Now, every day, you can buy them online. There are many websites that offer facilities to buy with a credit or debit card. On some sites, you can also use PayPal.