PCBA turnkey services production line solution SMT whole line solution “Fortune Technology” provides a complete set of solutions, provides strong technical support and personnel training! 1、 Basic process composition of PCBA 2、 PCBA turnkey services process 1. Surface mount process: ① single side assembly: (all surface mount components are on one side of PCB) incoming material inspection → solder paste mixing → screen printing solder paste → chip → reflow soldering; (2) double side assembly; (surface mount components are respectively on a and B sides of PCB) incoming material inspection → A-side silk screen solder paste of PCB → chip → A-side reflow soldering → flip board – > PCB B side silkscreen solder paste > chip > B side reflow soldering – > (cleaning) – > inspection > repair 2. Mixed assembly process ① single side mixed assembly process: (both plug-ins and surface mount components are on the a side of PCB) incoming material detection → solder paste mixing – > A-side silk screen solder paste of PCB → chip → A-side reflow soldering of PCB → wave soldering or dip soldering (a small number of plug-ins can be welded manually) – > (cleaning) – > inspection > repair (paste first and then insert) ② double side mixed assembly process: (surface mounted components are on the a side of PCB, and the plug-in is on the B side of PCB) A. incoming material detection > solder paste mixing > A-side silk screen solder paste of PCB → chip → reflow soldering → B-side plug-in of PCB → wave soldering (a small number of plug-ins can be welded manually) – > (cleaning) – > inspection > rework B. incoming material detection – > Screen printing solder paste on a side of PCB > patch > solder paste for manual solder check of A-side plug-in of PCB > B-side plug-in of PCB > reflow soldering – > (cleaning) – > inspection > repair (surface mounted components are on a and B sides of PCB, and plug-ins are on either side or both sides of PCB) First, reflow soldering of surface mount components on both sides of a and B of double-sided PCB is carried out according to the method of double-sided assembly, and then the plug-ins on both sides can be welded manually
3、 Introduction of PCBA turnkey services equipment
Template: (steel mesh) first, determine whether to process the template according to the designed PCB. If the chip components on the PCB are only resistors and capacitors, and the package is more than 1206, the solder paste can be coated with needle barrel or automatic dispensing equipment without making templates; if the chips with sot, SOP, PQFP, PLCC, and BGA packages and the packages of resistors and capacitors are below 0805, templates must be made. General templates are divided into chemical etching copper template (low price, suitable for small batch, test, and chip pin spacing > 0.635mm); laser etching stainless steel template (high precision, high price, suitable for a large batch, automatic production line, and chip pin spacing < 0.5mm). For R & D, small batch production or spacing > 0.5mm, etching stainless steel template is recommended; for batch production or spacing < 0.5mm, laser cutting stainless steel template is recommended. The overall dimension is 370 * 470 (unit: mm), and the effective area is 300 * 400 (unit: mm).
Silkscreen printing: (high precision semi-automatic solder paste printing machine) its function is to use a scraper to leak solder paste or chip glue onto the pad of PCB to prepare for the mounting of components. The equipment used is a manual wire printing station (screen printing machine), a template, and a scraper (metal or rubber), located at the forefront of the SMT production line. Our company recommends to use a medium-size silk screen printing machine to fix the template on the screen printing platform, and fix the position of PCB on the screen printing platform through the up and down and left and right knobs on the manual screen printing platform, and fix the position; then place the PCB to be coated between the screen printing platform and the template, and place solder paste on the screen board (at room temperature), so as to maintain the stability of the template and PCB Parallel, evenly apply solder paste on PCB with a scraper. In the process of use, the template should be cleaned with alcohol in time to prevent the solder paste from blocking the leakage of the template.
Mounting: (Korea high precision automatic multi-function Mounter) its function is to accurately install surface mount components to the fixed position of PCB. The machine is used for the production of vacuum film. For laboratory or small-batch, our company generally recommends using double head anti-static vacuum suction pen. In order to solve the problem of high-precision chip placement and alignment (chip pin spacing < 0.5mm), our company recommends the use of a Samsung full-automatic multi-function high-precision placement machine (sm421, which can improve efficiency and placement accuracy). The vacuum suction pen can pick up the resistance, capacitance, and chip directly from the component shelf. Because the solder paste has a certain viscosity, the resistance and capacitance can be directly placed on the required position; for the chip, the suction cup can be added to the vacuum suction pen head, and the suction force can be adjusted through the knob. Remember that no matter what kind of components are placed, pay attention to the alignment position. If the position is misplaced, the PCB must be cleaned with alcohol, screen printing again, and the components should be placed again.
Reflow soldering: its function is to melt the solder paste so that the surface mount components and PCB are firmly brazed together to achieve the electrical performance required by the design, and it is fully controlled according to the international standard curve, which can effectively prevent the thermal damage and deformation of PCB and components. The equipment used is a reflow furnace (full automatic infrared/hot air reflow furnace), which is located behind the SMT production line.
Cleaning: it is used to remove the materials or welding residues such as flux which affect the electrical properties of the PCB. If no cleaning solder is used, it is generally unnecessary to clean. The products that require low power consumption or good high-frequency characteristics should be cleaned. General products can be free of cleaning. The equipment used for ultrasonic cleaning machine or alcohol direct manual cleaning, the position can not be fixed.
Inspection: its function is to inspect the welding quality and assembly quality of the PCB. The equipment used is a magnifying glass and a microscope. The position of the equipment can be configured in the appropriate place of the production line according to the needs of inspection.
Rework: it is used to rework the PCB with faults detected, such as solder ball, tin bridge, open circuit, and other defects. The tools used are an intelligent soldering iron, repair workstation, etc. Configuration in any position in the production line. 4、 SMT auxiliary process: mainly used to solve the mixed process of wave soldering and reflow soldering.
Ideasbcb has been engaged in the electronic industry for more than 10 years, with rich PCB design experience. Nine of them are part-time. The time is unstable and the efficiency is not high. Our shop is full-time order receiving the design. The general store can receive the design of a 32-layer board. Please recognize the strength of the shop. If you are interested in this store, please collect it
Our company can provide one-stop service of designing, copying, and welding samples;
Solemnly promise: the client’s documents are absolutely confidential;
Pads, PROTEL, Altium, cadence can be used to design PCB according to the schematic diagram and design requirements provided by customers. The complicated boards are all wired manually, so the buyer can rest assured of the quality;
Single and double-sided multi-layer board: from 50usd / model (please contact before shooting to evaluate the complexity, price, and time required for drawing boards);
mapping Please provide necessary design data, such as circuit schematic diagram, the board size, shape, mounting hole size, and location, need to draw single panel or double-sided board or 4-layer board, etc. either provide PCB component library or provide component size and pin position packaging information for PCB packaging. High current, high-frequency, differential, equal length, the easily interfered signal circuit should be explained in advance and can be provided at one time Complete documents and requirements, save you and I communication time.
The process of PCB wiring is: communication and negotiation — providing information — Taking payment — starting design — midway coordination — reminding design completion by delivery — customer online confirmation file screenshot — detail modification — completion of design — receiving — delivery of documents — evaluation.
The delivery time of a simple circuit is generally 1-3 days, and it will be discussed in case of complicated special circumstances. If you have urgent requirements, please put them forward in advance. This is not for sale. Once the project is started, you can’t refund it. Therefore, you should first receive the goods and then send the documents to the customers, so as to prevent some malicious buyers from repudiating the documents and refusing to give money, thus wasting the buyer’s design time and effort. If the PCB cannot be completed due to too small a panel frame provided by the buyer, no refund will be provided. If the price is repeatedly modified, the price should be renegotiated. Please see the above process and terms, and you agree to the above terms by shooting.
The buyer is fully responsible for the problem of the schematic diagram designed by the buyer. Of course, if any problem is found in the schematic design, the customer will be informed. If you can help, you will also help, such as the BOM list of components, the SMT component coordinate file, and the Gerber file required for opening steel mesh and PCB processing. You can ask any questions in the production and processing process