1. compound die: the die structure of the punching machine that completes multiple processes such as blanking and punching in one stroke.

2. Progressive die: it is composed of multiple stations, each station is connected in turn to complete different processing, and a series of different stamping processes are completed in one stroke of the punch.

Second, the characteristics are different.

1, compound die:

(1) The workpiece has good coaxiality, flat surface and high dimensional accuracy.

(2) The production efficiency is high, and it is not limited by the shape and size accuracy. Sometimes waste corners can also be used for copying.

(3) Die parts are difficult to manufacture and have high cost. Die and die are easily limited by the minimum wall thickness, and are not suitable for some lower parts with small inner hole spacing and small inner hole and edge spacing.

2, progressive die:

(1) progressive die is a multi-task continuous blanking die. In a mold, it can include many processes, such as blanking, bending and drawing, with high productivity.

(2) The progressive die is safe to operate.

(3) easy automation;

(4) High-speed punch can be used for production.

(5) It can reduce the area of punch and site, and reduce the occupation of semi-finished products transportation and warehouse.

(6) Parts with high size requirements should not be produced by progressive dies.

Extended data:

Matters needing attention of compound die:

(1) In order to save materials, a rotary punch can be used. At this time, the two inner guide posts can only be installed on the same side.

(2) When punching the convex position, the die needs to be pressed down. An insert can be designed on the upper splint, or a limit can be made between the lower bottom plate and the outer stripping plate. The internal force and external force are larger, and the outer die is higher than the punch for pressing. Stamping edge and big convex hull need to be fixed on the splint, and the stamping near the convex hull needs to be shorter to ensure the elongation of the material before stamping.

(3) When designing the compound blanking die for symmetrical products, positioning holes can be pre-designed on the redundant edges to prevent the reaction of subsequent processes.

(4) In order to prevent the stamping die from bursting due to assembly, it is necessary to design guide posts to prevent the stamping die from becoming dull.

Baidu encyclopedia-composite mold

Baidu encyclopedia-progressive die