A kind of closed pre-forging forming die and technology of special-shaped fuel injector body blank

Abstract

The invention belongs to the field of forging molding. A closed pre-forging molding die for a special-shaped oil spray device body workblank comprises an upper die body and a lower die body. A die cavity is formed in the lower die body. The die cavity comprises an upper die cavity corresponding to the head of the special-shaped oil spray device body workblank and a lower die cavity corresponding to the tail of the special-shaped oil spray device body workblank. The upper die cavity is defined by the side faces and the bottom face. The side face shape of the upper die body is matched with the shape of the upper die cavity. An ejector rod is arranged in the lower die cavity in a sliding manner. A process for molding the special-shaped oil spray device body workblank through the closed pre-forging molding die includes the following steps of blanking, heating, closed pre-forging, finish forging, trimming and post-processing, wherein in the closed pre-forging step, tag swaging is conducted under the support of the side faces of the upper die cavity of the closed pre-forging die. The closed pre-forging molding die and the process have the beneficial effects that in the closed pre-forging process, a special die structure is adopted, and a blank is supported laterally to be prevented from being bent and folded; and production efficiency is high, the material utilization rate is high, the forging streamline is good, quality is good, and mechanization and automation are easy to realize.

Description

technical field [0001] The invention belongs to the field of forging forming, and in particular relates to a closed pre-forging forming die for a special-shaped fuel injector body blank and a process thereof. Background technique [0002] Such as Figure 7 As shown, since the diameter of the middle part 32 of the special-shaped injector body is small, and the size of the head 31 is large, problems such as material backflow and folding caused by lateral head 31 filling are prone to occur during die forging. Conventional forming methods are: heading, pre-forging, final forging, edge trimming. In order to ensure that the lateral head is full and there will be no problems such as backflow during final forging, sufficient margin has to be left in this part when heading, resulting in the original If the length of the billet is too long, problems such as billet instability and wrinkling and low material utilization rate are prone to occur when heading. Contents of the invention ...

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Problems solved by technology

Conventional forming methods are: heading, pre-forging, final forging, edge trimming. In order to ensure that the lateral head is full and there will be no problems such as backflow during final forging, sufficient margin has to be left in this part when heading, resulting in the original If the length of the billet is too long, it is prone to problems such as billet instability, wrinkling and low material utilization rate when heading

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