Forging forming method and die for unequal-thickness hollow part plate

Abstract

The invention provides an unequal-thickness hollow part plate forging forming die which comprises a forming male die, an outer side female die, a female die base plate, a floating mandrel and a detachable core. The invention further provides an unequal-thickness hollow part plate forging forming method which comprises the steps that firstly, one end of an original pipe blank with the outer diameter equal to the outer diameter of a target part is placed in the female die; then the male die slowly moves downwards, a part with the required small-end appearance is extruded through upsetting, and then the floating mold core is pushed upwards by the press machine to eject the part out; secondly, the other end of the part is placed on a female die base plate, a forming male die slowly descends, and ejection and demolding are conducted after reaming is completed; and thirdly, the part subjected to broaching in the last step is placed in the female die, then the male die moves downwards slowly, the inner portion of the upper end of the part is thickened, and then the part is ejected out through an ejector device below the press machine. And fourthly, the part formed in the last step is placed in the female die, the male die moves downwards slowly, the thickened part is necked towards the middle, and then the part is ejected out through an ejection device below the press.

Description

Technical field [0001] The present invention relates to the field of metal plastic forming technology, in particular to a hollow part plate forging forming method of unequal thickness and a mold. Background [0002] The metal pipe used in the automobile exhaust pipe has strength requirements for the joint, so the part of the connection needs to be thickened, and the wall thickness of the other parts is the wall thickness of the original pipe, and the thin metal pipe with one end is formed with cold extrusion at one end, and the other end is difficult to form due to the inability to insert the core, which brings new challenges to the field of metal plastic forming. [0003] At present, people generally use the roll rolling method to form metal tubes with unequal wall thickness, but the rolling equipment occupies a large area, high cost, is not suitable for small batch production, and is also prone to shrink holes, porosity, fatigue cracks and other defects. [0004] Therefore, how...

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Problems solved by technology

[0003] At present, people generally use the rolling method to form metal pipes with unequal wall thickness, but the rolling equipment occupies a large area and costs high, which is not suitable for small batch production, and is prone to defects such as shrinkage cavities, pores, and fatigue cracks.

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