Circuit board, also known as PCB, is an important electronic component, the support of electronic components, and the provider of electrical connection of electronic components.
Circuit board proofing refers to the trial production of printed circuit boards before mass production. It is mainly applied to the process that electronic engineers conduct small batch trial production to the factory after designing the circuit and completing the circuit board, that is, circuit board proofing. However, the production quantity of PCB proofing generally has no specific boundary. Generally, engineers call it PCB proofing before the product design is confirmed and tested.
Second, proofing concerns
1. The products in the speed PCB market change all the time. In this industry, time is a very important factor. Delivery and quality are the hard strength of the factory, and they are also the most favored by engineers and factories. At present, PCB factories generally provide expedited service, and those that do it quickly have a normal delivery time of 2 days. Now, for example, in Guangming Jingbang Electronics, all proofing samples are expedited by default, quality control, engineering and production are monitored in real time, and our advantage lies in the advanced production equipment: MYDATA-600, which does not need to open a steel mesh, produces automatically, saves time and effort, and is precise and exquisite.
2. Quality
It is the trial production of engineers before the product design is confirmed and tested, and the quality can never be ignored. From raw materials, drawing, to production, testing, quality control, etc., every link needs to be strictly controlled. Now, for example, for ordinary double panels, sheet metal generally includes FR-4, aluminum substrate, CEM-1, etc., with thickness ranging from 0.4mm to 3.0m, and copper thickness ranging from 0.5oz to 3.0oz The differences of these materials lead to great differences in quotation. At present, the better materials used by manufacturers are imported Shengyi sheets.
3. Price
With the development of the industry, the prices of PCB proofing and small and medium-sized batch production are falling. At present, many proofing companies, such as Jiepei, cancel all proofing/small batch film fees, and the film fees withdraw from the historical stage. Complete challenging tasks with challenging prices, which will be the price trend of the next PCB proofing.
Third, the measurement standard of circuit board proofing quality
1. Copper skin is not easy to fall off in high temperature environment;
2. The line thickness, line spacing and line width of the line meet the design requirements, so as to prevent the line from heating, short circuit and open circuit;
3.PCB circuit board has no additional electromagnetic radiation;
4. In the process of PCB proofing, high temperature, high humidity and other special environments are taken into consideration;
5. The copper surface is not easily oxidized; The service life of the oxidized circuit board will be greatly shortened.
6. Reasonable deformation error; Nowadays, mechanical installation is adopted, and the hole position of the circuit board and the distortion error of the circuit design should be guaranteed within the allowable range.
Combining these six aspects, we can judge whether the printed circuit board is “excellent” or not. At present, there are thousands of PCB manufacturers in Qian Qian. It is suggested that users should keep their eyes open in the process of selecting PCB, and then choose the manufacturers on the basis of having a certain understanding of PCB, so as to prevent being cheated.
At present, the demand groups of PCB proofing are mainly concentrated in areas with relatively developed electronic products, such as Shenzhen, Beijing, Shanghai, Suzhou, Hangzhou, Xi ‘an, Chengdu, Changsha and other cities. However, with the gradual maturity of China’s PCB industry, the growth rate of the industry tends to be stable, and the domestic PCB industry is undergoing structural changes. The market share is biased towards excellent PCB manufacturers, and the industry concentration is expected to be further improved.
For those of you who have invested in this piece, look at the calculation method of the number and cost of patch processing now.
At present, SMT products mainly include lead-free soldering process, lead soldering process and red glue soldering process. The calculation method of points is similar, but many users don’t know much about how to calculate the points and costs of SMT patches. Today, Xiaobian specially shares with you the calculation method of points and expenses for SMT chip processing:
Some companies calculate one pad as one point, but there are also cases where two pads are calculated as one point. Take the pad calculation as a point in this paper as an example. You only need to calculate the number of pads on the PCB board, but when you encounter some special components, such as inductors, large capacitors, and ics, you need to calculate the demand rating. The detailed experience method is as follows: for example, inductors can be counted as 10 points, and ics can be folded in half according to the number of pins (for example, 40-pin ics can be counted as 20 points). According to the above method, the total number of solder joints of the whole PCB can be easily calculated.
Second, the unit price of solder joints:
At present, the unit price of solder joints varies from 0.008 to 0.03 yuan/solder joint price, which depends on the following conditions:
1. Unit price according to process:
A solder paste with lead SMT patch processing price is relatively cheap.
The processing cost of B solder paste lead-free SMT patch is relatively high.
The processing cost of C-rubber environmental protection SMT patch is relatively low.
D solder paste and red glue dual-process SMT patch has high processing cost and relatively troublesome process.
2. By order quantity:
A common SMT chip proofing processing 3-20 pieces, will charge the engineering fee, not according to the number of points multiplied by the unit price.
B small batch SMT chip processing and production of less than 1000 chips, will charge the startup fee+points multiplied by the unit price.
C SMT patch processing in batches, calculated by multiplying the number of points by the unit price.
3. According to the difficulty of the board
A single-sided, single-sided SMT patch processing is relatively fast, and double-sided SMT patch processing needs to turn twice, so the cost is high.
B precision points to more precise SMT chip processing. If you have BGA high-density IC, the solder paste for the board will be expensive.
The density of C chip components is divided into many points in the same size PCB. The efficiency will be high, because when the mounter works, the coordinate stroke is shorter, and the SMT chip processing will be faster.
4. Start-up fee: If the processing fee of a single batch is less than 1000 yuan, it is a small batch processing order. After the small batch SMT chip processing order is calculated according to the number of points, it will depend on the type of board components, the time for debugging the chip mounter, and the difficulty of making the first piece. An additional startup fee ranging from 400 to 2000 yuan will be charged.
5. Proofing Fee: For SMT chip processing order, a proofing order for SMT chip with less than 100 chips, the difficulty degree of the board, the time to do the program and the time to change the line on the computer are different, and the engineering fee ranging from 800 yuan to 3,000 yuan will be charged.
6. Steel mesh fee: according to the size of PCB, open different types of steel mesh. According to the precision of PCBA chip on board, choose electropolished steel mesh or ordinary steel mesh. The cost of steel mesh for different types of steel mesh is about 120~350. Of course, customers can also provide their own steel mesh.
III. Calculation of SMT chip processing cost:
1. Calculation cost Processing fee = number of points * unit price of 1 point (processing fee includes red glue, solder paste, AOI testing and other expenses)
