According to structure characteristics and problems in the existing mold of the plug base, analyzed the mold structure, as well as secondary ejection structure by tension plate pendulum block was established, in addition, solved the problems of internal surface of the plug base becoming dark and out surface having burr.

Petroleum geologic property and hydrocarbon accumulation pattern of Seyun-Masila basin in the South of Arabian Plate;

A mechanism with inward core-pulling in three directions was developed in which spring knock pin is used to drive the centering block to rotate for the core-pulling action.

To form a part with multiple bent angles,a bending die with upper and lower swaying blocks are used.

When the work piece is bent to a certain degree,the upper swaying block sways to the lower end together with the lower swaying block.