According to the principle that the volume of work piece is invariable during die forging,combining the roughcast pre forming and heat stretch forming process,the steel half spherical shell with double flange(equator and waist flange)can be forged.

Objective:To explore the effect of compression therapy on upper extremity lymph edema post mastectomy of breast cancer patients,and to evaluate its clinical significance by excise of fitness steel ball.

Structural properties and its application of vertical and horizontal steel ball lapping machine;

Improvement on way of hot-rolling original steel balls workblank;