Custom Tooling for Your Push-Pull Testing Machine Application.

When evaluating a push-pull testing machine specifically for wire bond pull testing, several key specifications are critical. Force accuracy, typically expressed as a percentage of the reading, is paramount; look for high accuracy even at the low end of the sensor's range. The Z-axis resolution and accuracy determine how precisely the machine can control the position of the pull hook, which is vital for repeatability. The range of pull hooks available is also important, as you will need different sizes and shapes to accommodate various wire diameters and loop heights. The magnification and lighting of the optical system are crucial for allowing the operator to precisely position the hook on fine wires. Finally, the machine's ability to record not just the peak force but also the JEDEC-standard failure mode is essential for effective process diagnostics when using a push-pull testing machine.

Selecting the right push-pull testing machine requires a careful evaluation of your specific applications. First, identify the types of tests you need (e.g., wire pull, die shear, ball shear). This will determine the required test modules or heads. Second, determine the force ranges needed for each test. A machine used for fine gold wire will need a very sensitive low-force sensor, while a machine for large die shear will need a high-force capability. Look for a system with interchangeable load cell cartridges for maximum flexibility. Third, consider the level of automation and the required throughput. Manual or motorized stages may be sufficient for a lab, while a fully automated system might be needed for high-volume production. Finally, evaluate the software capabilities, ensuring it can perform the necessary analysis and generate reports that meet your quality standards. Consulting with an expert at WBE can help you navigate these options to configure the perfect push-pull testing machine.

Given the extremely small forces being measured, regular and proper calibration of a push-pull testing machine is absolutely essential for data integrity. Calibration is the process of comparing the machine's measurements to a known, traceable standard to ensure its accuracy. This should be performed on a regular schedule, typically annually, by a qualified technician. The process involves using a set of certified micro-weights to verify the accuracy of the load cell across its entire operating range. The positioning accuracy of the X, Y, and Z stages may also be verified using precision instruments. Without this regular verification, there is no guarantee that the force readings from the push-pull testing machine are correct, which can invalidate test results and compromise quality control. WBE offers accredited calibration services to ensure our clients' machines continuously operate at their peak specified accuracy.

When using a push-pull testing machine, engineers can choose between two fundamental methods: destructive and non-destructive testing. Destructive testing is the most common method used for process control. It involves testing a sample of components to failure to determine the absolute maximum strength of the bonds. This provides valuable statistical data about the health and capability of the manufacturing process. Non-destructive testing, on the other hand, is used for 100% screening of very high-reliability devices, such as those used in military or space applications. In this test, the machine applies a proof force—a force that is significant but well below the expected breaking point—to every single wire bond. If a bond survives, it is certified as meeting a minimum strength requirement. WBE's push-pull testing machine can be precisely programmed to perform both types of tests accurately.