Steering Stop parts constituting the suspension system of automobiles are located inside an automobile suspension. They are used to fix upper and lower suspension arm parts by welding. The purpose of this study was to develop Steering Stop parts for automobile suspension. Cost increase due to problem of existing tool life is a challenging issue. This study tries to solve the tool life problem and reduce the cost using a former cold forging complex forming technology. We developed a long-life complex forming technology between multistage former forging and cold forging for producing Steering Stop parts of automobile suspension.

In this study, we performed the compressive strength test of trabecular bone in knee joint for measuring the elastic modulus and ultimate strength. The main knee joint is femorotibial articulation between the lateral and medial femorotibial condyle. In the case of osteoarthritis, some patients have only medial condylar osteoarthritis. We performed the mechanical test for comparison the difference of the each condylar strength. We used diamond core-drill and linear precision saw for making the specimens. Specimens were cored from both condyle in distal femur and proximal tibia in fresh cadaver (male 10, female 12), and tested by universal test machine with temperature control saline circulation system. Results of the test in distal femoral parts, averaged elastic modulus was 360.61±159.40㎫ for male, 150.89±70.65㎫ for female. Averaged ultimate strength was 6.79±2.91㎫ for male, 2.89±1.31㎫ for female. Male was 2.4 times stronger than female. In the proximal tibial parts, averaged elastic modulus was 108.80±52.88㎫ for male, 73.45±55.06㎫ for female. Averaged ultimate strength was 2.59±1.39㎫ for male, 1.75±1.16㎫ for female. Male was 1.5 times stronger than female. In the distal femoral condyle, medial condyle had more strength than lateral condyle at middle region. But lateral condyle had more strength than medial condyle at anterior & posterior regions (p＜0.02). In the proximal tibial condyle, medial condyle had more strength than lateral condyle. (p＜0.01).