The Critical Role of a Push-Pull Testing Machine in Process Control.

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.

A push-pull testing machine, known in the industry as a bond tester, is a specialized instrument used to measure the mechanical strength of the tiny connections inside electronic and semiconductor devices. Its primary purpose is to perform quality control by applying precise push (shear) or pull (tensile) forces to these connections until they fail, thus determining their strength. Key applications include wire bond pull testing, where it hooks and pulls a wire to ensure it is properly attached; ball shear testing, where it pushes on a solder ball to test its adhesion to a circuit board pad; and die shear testing, which measures the strength of the adhesive holding a silicon chip onto its package substrate. This data is critical for manufacturers to ensure their products are robust enough to withstand the stresses of assembly and everyday use, preventing field failures and ensuring long-term reliability.

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.

MIL-STD-883 is a U.S. military standard that establishes uniform methods for testing microelectronic devices. It is the gold standard for ensuring the reliability of components used in demanding military, aerospace, and defense applications. Several of its test methods apply directly to the use of a push-pull testing machine. For example, Method 2011 specifies the procedures for wire bond pull testing, outlining the required forces, test conditions, and failure criteria for different wire types and diameters. Method 2019 covers die shear testing. Adherence to these standards is mandatory for suppliers in the defense industry. A high-quality push-pull testing machine from WBE is designed to meet and exceed the accuracy and performance requirements of MIL-STD-883, with software that can be configured to execute these test methods precisely and generate compliant reports, ensuring your components are qualified for high-reliability applications.