Disclosed are an apparatus and a method for deep drawing of large-sized thin-wall curved surface parts with servo reverse bulging, which pertain to the technical field of drawing of a thin-wall curved surface part. The apparatus includes a forming die, a jacking unit, and a power unit, wherein the forming die includes an upper die, a lower die, and a blank holder. The upper die and the blank holder are connected to a press machine, the blank holder is disposed above the lower die, and a blank to be drawn is placed between the lower die and the blank holder; the jacking unit is disposed inside the lower die and adapted to move along a moving direction of the upper die, enabling the blank to be drawn to deform by with reverse bulging. The method can inhibit defects of wrinkling and cracking in drawing processes effectively.

A can container includes a can barrel and a can bottom; the can bottom includes a dome part which is concaved toward an inner side of the can container along a direction of a can axis at a center, and also includes an annular convex part which projects toward an outer side of the can container so as to shape an annular support part on an outer periphery of the dome part: and the dome part has a central dome part which is positioned on the can axis and has a set radius of curvature, and an outer peripheral dome part which is shaped continuously on an outer side of the central dome part, has a center of curvature positioned on the can axis, and has a radius of curvature smaller than the radius of curvature of the central dome part.- - -

A clamp ring assembly for use in a can bottom forming assembly comprising a clamp ring retainer, a clamp ring having a biasing assembly and an inner dome die. The clamp ring floats with respect to the clamp ring retainer to accommodate off center contact by the punch and to center the punch at the end of the ram stroke, A slightly conically shaped inner dome die structure or dome plug may be provided to further center the punch at the end of the ram stroke.

A clamp ring assembly for use in a can bottom forming assembly comprising a clamp ring retainer, a clamp ring having a biasing assembly and an inner dome die. The clamp ring floats with respect to the clamp ring retainer to accommodate off center contact by the punch and to center the punch at the end of the ram stroke, A slightly conically shaped inner dome die structure or dome plug may be provided to further center the punch at the end of the ram stroke.

An ironing mold according to the present invention is provided with a punch, and a die which forms a pushing hole with respect to the punch. When the skewness Rsk of a surface treated metal plate is less than −0.6 and no less than −1.3, then the curvature radius of a shoulder portion of the die and a clearance between a radius end and the punch are determined such that Y, which is expressed by {(t.sub.re−c.sub.re)/t.sub.re}×100, and X, which is expressed by r/t.sub.re, satisfy 0<Y≦18.7X−6.1, X satisfies X≧0.6 and r satisfies r≦0.5 h.

An ironing mold according to the present invention is provided with a punch, and a die which forms a pushing hole with respect to the punch. When the skewness Rsk of a surface treated metal plate is less than −0.6 and no less than −1.3, then the curvature radius of a shoulder portion of the die and a clearance between a radius end and the punch are determined such that Y, which is expressed by {(t.sub.re−c.sub.re)/t.sub.re}×100, and X, which is expressed by r/t.sub.re, satisfy 0<Y≦18.7X−6.1, X satisfies X≧0.6 and r satisfies r≦0.5 h.

An apparatus for forming a base profile on a metal container carried on a punch moving along an axis. The apparatus comprises a die for forming the base profile on the container and a resilient support for holding the die in a resting position substantially along said axis whilst allowing the die to be deflectable perpendicular to said axis and providing a restoring force to return the die to the resting position.

The invention relates to a method for producing a component, said method comprising: preforming a workpiece to a preformed component having a base region, a side-plate region, and optionally a flange region, such that the preformed component has a material surplus for the side-plate region and/or the base region and/or optionally the flange region; and calibrating the preformed component to an at least in regions finally formed component having a base region, a side-plate region, and optionally a flange region; wherein the base region of the preformed component has substantially the geometry and/or the local cross sections of the base region of the at least in regions finally formed component. The invention moreover relates to a device for producing a component, in particular for carrying out the method.

The invention relates to a method for producing a half-shell part with a drawing punch and a drawing die. The object of providing a method for the process-reliable and cost-effective production of highly dimensionally stable half-shell parts is achieved in that, in a single work step, the drawing punch is advanced into the drawing die, a sheet metal blank is preformed into a sheet metal raw part with at least one base section, at least one frame section and optionally a flange section, wherein during the preforming with the drawing punch a material excess is introduced either into the base section and the frame section or into the optional flange section of the sheet metal raw part, and the sheet metal raw part is finished to form a half-shell part and calibrated.

The invention relates to a method for producing a half-shell part with a drawing punch and a drawing die. The object of providing a method for the process-reliable and cost-effective production of highly dimensionally stable half-shell parts is achieved in that, in a single work step, the drawing punch is advanced into the drawing die, a sheet metal blank is preformed into a sheet metal raw part with at least one base section, at least one frame section and optionally a flange section, wherein during the preforming with the drawing punch a material excess is introduced either into the base section and the frame section or into the optional flange section of the sheet metal raw part, and the sheet metal raw part is finished to form a half-shell part and calibrated.