Established in 2013, our company includes anti-corrosion equipment, computer software technology development, technical consulting, technology transfer, technology transfer, engineering services and design services for shipbuilding; manufacturing of industrial automatic control system equipment; hot dip galvanizing, electrostatic spraying; ship riveting welding、rust removal、painting and cleaning, anti-corrosion insulation engineering professional contract; sales of labor protection articles; import and export of goods、import and export of technology、domestic general trade、instrumentation equipment lease. The PCBA is used in Marine engineering projects. The specific product is a high-power power supply.
At the initial stage, the customer ordered six kinds of materials, and all the materials were mixed together, which caused great difficulty for the staff. There can be hundreds of materials for any project and it is difficult to verify the amount of materials.
The circuit board consists of 4 layers and a size of 370 * 229mm and an inner and outer copper thickness of 3 OZ. Since the PCB carries a large current and the copper thickness and the surface area of the metal device is large, so the requirements are as follows:
1.The 6 components are sot-227 packaging and post-assembly materials and the pads must be strictly flat and not tinned. Use high temperature resistant adhesive paper to protect the top and bottom of the pad and the non-metallic holes on both sides. In addition, the metallized floor positioning holes on the left and right sides cannot be tinned.
2.Solder plug holes are required for all 1.2mm and 1.0mm window holes. Any 1.2mm, 1.0mm vias that are not covered will require a solder plug hole, especially Q50 、 Q51 、 Q53 、 Q54 、 D79 and D80, watch out for the high temperature adhesive paper that will not be covered around the hole can.
PCBA K foot
Since we do not have any tools for making K-foot, we make our suggestion to the customer: The resistance level can be guaranteed, but the K-foot shape is not adhered to. Considering that we did guarantee the height of K foot in the sample, the customer accepted our proposal.
4.100% tin penetration of all THT through-hole pads is required;Main power material to ensure;And ensure that the material is close to the PCB, no visible floating height, tilt, etc.
5.R309 shunt, the middle is the detection end, please be careful not to weld with the left and right main circuit.
As there are many welding requirements, we confirm the first plate very carefully and try our best to meet the customer’s requirements.
The customer needs to make two test boards first. In the first production, we only finished one board a day, which was very difficult. The early workshop spent a lot of time in the processing, including cutting feet, sticking tape.
and covering areas where wave soldering is not allowed. The working efficiency was really low, so the customer suggested to choose wave soldering. However, the base plate had no edge, and we bought the loading board.
And the customer is an engineering designer and has no chance to participate in the actual production, we suggest the customer come to the factory to visit the mounting process of the board. There may be some differences between the design in the software and the actual operation. For example, the board molding method, and usually PCB are V-cut, only when the special or circular plate is possible to use stamp holes, and the number of stamp holes and aperture of different boards will be different, too many holes will cause very laborious plate. Therefore, we carefully explain to the customer the details of each step of the mounting process.
The PCBA is very heavy
The PCBA is very heavy. The customer originally planned to choose express delivery. However, after evaluation of the PCBA, we suggest the customer pick it up by himself. The welding requirements of our clients are very much, process is more precise.
At the beginning, there were a lot of problems, including plate tin difficulty,and installation direction of components and K feet, etc. The demands on workers were also high.No matter what difficulties we encounter, we are still overcoming them. Customers are very satisfied with the product, it is worth our efforts.
Our company has the ERP system, which can perfectly keep all the information of customers and record and solve all kinds of problems. These processes are all designed to prevent the same problem from happening again.
Customers express gratitude to our product quality and service attitude. They also express their willingness to cooperate with us and their approval of our price. We believe that there will be more cooperation opportunities in the future.
86PCB specialize in PCB Manufacturing, Components Sourcing, PCB Assembly, Housing Assembly, Function Test etc.
Got the certification of TS16949, UL, RoHS, CE, ISO.
ERP system can clearly record the information and changes of each project and manage the data well.
PCB/PCBA projects for more than 80 countries with good quality and suitable price