Stacking Fixture

A stacking fixture is a critical component in the manufacturing of electrical steel lamination cores, designed to hold individual laminations in perfect alignment while they are stacked to form the core structure. It ensures consistent positioning, prevents misalignment, and maintains the required insulation between laminations, which is essential for optimal magnetic performance and energy efficiency in electrical equipment. The fixture typically consists of alignment pins, clamping mechanisms, and a base plate. Laminations are placed over the alignment pins to ensure precise positioning. Once stacked to the required height, the clamping mechanism secures the stack to prevent movement during handling or subsequent processing like welding or bonding. Available in tool steel or stainless steel, the fixture offers a clamping force range of 5–20 kN, stack height capacity of 50–500 mm, and lamination width range of 20–200 mm. Alignment accuracy is ±0.05 mm, parallelism is 0.02 mm, and operating temperature ranges from -10 to 60 °C with a maximum humidity of 95% RH (non-condensing). Material grade S45C per GB/T 699 is specified for high-strength carbon steel, with surface hardness of HRC 40–45. Weight varies from 15–30 kg, and base plate dimensions range from 300×300 to 600×600 mm. These parameters are reference ranges for typical configurations; actual values must be confirmed for the specific model and application. The fixture is used in electrical equipment manufacturing, particularly for transformer and motor cores. It is not a finished product but a component for production tooling. Always verify model-specific values and standards with the legal manufacturer or supplier before procurement.

The stacking fixture operates by using alignment pins to position each lamination precisely. The operator places laminations over the pins, which are mounted on a base plate. As the stack reaches the desired height, a clamping mechanism applies force to secure the stack. This force is adjustable within a range to ensure rigidity without deformation. The fixture's parallelism and alignment accuracy are critical to maintain uniform pressure distribution and minimize core losses. The base plate provides stable support for various core sizes. The fixture is designed for manual or semi-automated operation, depending on the production line. It must be maintained to prevent wear and ensure consistent performance. The clamping force and stack height are set according to the core specifications. The fixture does not perform welding or bonding; it only holds the stack in place during those processes.