Rework and Repair Affect Costs in Board PCB Assembly
In board pcb assembly, there are many factors that can impact the overall cost of production. These include the number of layers, component cost, assembly method, lead time, shipping methods and labor. Strict design rules and tight tolerances can also increase costs. However, a flexible manufacturing approach can help to reduce these costs by optimizing the assembly process.
Rework and repair are a necessity in most PCB assembly processes. However, they can also be costly in terms of equipment, labor and WIP (Work In Process). The best way to minimize these costs is to employ lean six sigma techniques to cut down on cycle times.
The most common causes of rework are due to soldering errors or component damage. These mistakes can be caused by a variety of reasons, including a lack of training, the wrong tooling or temperature control. In many cases, these errors are preventable. But in others, they simply cannot be avoided.
To avoid these issues, a good PCB assembly company will have in place a quality assurance program that includes training and the use of specialized tools. This can reduce rework time, improve yield and reduce downtime. In addition, the proper selection of tools and heat profiles can make a significant difference in the reliability of the finished product.
How Does Rework and Repair Affect Costs in Board PCB Assembly?
Another factor that impacts rework and repair costs is the type of PCB. Those with a high number of layers or non-standard shapes can require additional processing and more precise placement, which adds to the cost. The choice of base material, such as FR-4, Rogers or polyimide, can also affect the cost. Higher-performance materials often come with a higher price tag but may be necessary for specific applications or operating environments. Finally, the type of surface finish, such as immersion silver or electroless nickel immersion gold (ENIG), can increase or decrease costs.
In some cases, reworking a component can be impossible as it’s hidden by other components. This can happen when PCB manufacturing professionals fail to leave adequate space on their boards for tools, or when a defective component is placed too close to the same location as a functioning one. These problems can be avoided with proper engineering and a robust rework procedure, but they will still occur.
One of the most important aspects of a successful rework and repair operation is the use of a rework station that has a high-temperature hot gas reflow oven. This helps to reduce the risk of damage to delicate components when re-soldering them. This is especially important for products that perform critical functions, such as a pacemaker.
Another cost-saving strategy is to focus on the reduction, reuse and recycling of failed PCBs. This can help to reduce the need for new components, while decreasing manufacturing pressures and mitigating environmental concerns. This is possible through the use of hydrometallurgical processes to extract valuable metals from expired components, as well as other means. By prioritizing these strategies, manufacturers can both save money and create a more sustainable future for the industry.
