Designing Fixtures in Board Assembly
Fixtures are an essential part of the production process, enhancing efficiency and accuracy while reducing safety risks. They securely hold workpieces while machining and assembly, ensuring consistent results with every operation. Fixtures have evolved to closely follow advances in industrial processes and are increasingly being used to support new technologies such as 3D printing and automation.
Designed and built to streamline the manufacturing process, fixtures eliminate a significant number of errors and set-up steps. This significantly reduces cycle times, resulting in higher productivity and less waste. They also help manufacturers respond more quickly to product changes, lowering costs and enabling faster time-to-market.
When selecting a fixture vendor, look for one that understands the importance of a quality fixture. This includes a thorough Design for Test (DFT) process that ensures the fixture is free of mechanical defects. During the DFT process, PCB board assembly and circuit components are analyzed to identify potential failures. Failures caused by poorly designed or constructed fixtures – including misplaced push rods and PCB supports, incorrect probe set heights and force, and insufficient pressing forces – can disrupt and disqualify the testing process, increasing testing times and production costs.
Ergonomics and operator safety are also important. Designing jigs and fixtures that are easy to use and keep the workpiece secure with simple fasteners or clamps helps to minimize strain, fatigue and injury. The machining process requires repeated and repetitive motions, so a jig or fixture that requires excessive manual manipulation can lead to worker discomfort. Choosing simpler designs also minimizes cycle times, improving overall productivity and reducing workplace stress.
Key Considerations for Designing Fixtures in Board Assembly
In addition to ensuring the safety of the workpiece, fixtures must be designed for longevity. This includes a robust, durable design that can withstand a wide range of temperatures and handling conditions. A well-designed jig or fixture should also incorporate features that prevent damage from vibration or shock, as well as protect against contamination and corrosion.
Fixtures must also be able to withstand the rigors of manufacturing. This includes a strong, reliable base that can withstand the forces of machining and other operations, as well as a flexible layout that accommodates changing product requirements. Finally, the fixture must be easy to maintain and clean. This includes a simplified design that is easily reconfigured for different products, as well as a clear and concise process for loading and unloading the workpiece.
The best way to achieve a quality fixture is by using a solution that offers a full range of design automation tools. Software solutions like Fixture Mate provide designers with the freedom to create and modify complex fixture geometries while allowing non-CAD users to make valuable contributions. This allows designers to quickly respond to production demands and deliver high-quality, custom fixtures without the need for extensive CAD expertise.
Gradually raises the temperature of the PCB to prevent thermal shock and activate the flux in the solder paste. Maintains a stable temperature to ensure the flux cleans the metal surfaces and prepares for soldering. Peaks at a temperature high enough to melt the solder paste, forming the solder joints.