Compound Die

In compound dies stamping, outside blanking and internal piercing can occur during one stroke, which reduces the location error that can appear when the part is moved between tools. The cutting actions are timed through the plate stack, stripper, and knockout arrangement. Compound stampings can achieve good concentricity, but the tool sees a concentrated cutting load and needs enough support below the active area. The press capacity, shut height, bolster opening, and dropping-off direction should be verified against the actual 530 x 460 mm die set and 690 x 320 mm bottom plate.

A washer compound die is the familiar example because the inner hole and outside diameter are produced together. A compound die for washer production may also include multiple cavities where volume and press area permit. The same principle can be applied to brackets, plates, shims, and other relatively flat parts, provided the blank can leave the tool without catching on the punch or knockout. The project part should not be assumed to be a washer unless the drawing confirms that geometry.

Punch and die clearances are selected for the 0.8 mm DX51D sheet and required burr condition. Accurate guide elements keep the inner and outer cutting edges concentric, while backup plates prevent local deflection. Replaceable punches, die buttons, and trim sections make repair more practical. Scrap and finished parts need separate routes so a slug cannot return to the surface and create tool marks. Standard components may follow the buyer's approved list when dimensions and load ratings agree. Sharpening limits and knockout travel should be recorded because both affect part height in the die and the timing of discharge.

Please issue the press specification and die technical standards with the latest 3D drawing and controlled 2D drawing. Required flatness, edge quality, annual volume, inspection gauges, and approved spare parts will complete the tooling review.