Simulation Analysis of Springback for Lead Frame Copper Alloy

Abstract

The bending performance of lead frame materials is a very important in improving the quality of lead frame alloys and meeting the needs of high performance integrated circuit. The sringback amount of curvature variation of CuFeP , CuCrZrMg , CuNiSi and CuCrSnZn alloy are researched by numerical simulation. Bending model is built by 3D modeling software, and the necessary post-processing is carried out. The bending springback amount △K of the four kinds of copper alloy materials are calculated out. The results show that the sringback amount of curvature variation of four copper alloys at the same condition from large to small in turn is CuCrZrMg, CuNiSi, CuFeP, CuCrSnZn. Smaller the minimum relatively bending radius of copper alloy used in lead frame, less the springback amount and better the forming performance.

Characteristic microstructure of micro hot rolled plate steel variating the radius of bending treatment with quenching and tempering heat treatment

“…Quenched steel has the highest strength and hardness limits but low ductility. Distortion occurs during the formation of martensite platelets which leads to increased strength and hardness [3]. To maintain the strength of quenched martensite for industrial scale it was tempered at temperatures between 150 °C -200 °C [4].…”