1results about How to "Avoid necking" patented technology

The utility model provides a kind of stamping die and ejection structure, comprising: lower die holder, the gas top assembly includes the conveying gas pipe for conveying compressed gas, the conveying gas pipe is connected with the lower end of gas nozzle by branch pipe and is sealed, each the guide base inside is symmetrically equipped with two gas nozzles for gas top, in actual use, the setting of gas nozzle can be mutually matched with guide rod to eject the element of stamping forming, can avoid the problem of stress concentration caused by single-point ejection occurs, compared with prior art, the utility model has the beneficial effects as follows: by setting gas top assembly, the stress concentration problem that forming element is received when ejecting can be avoided, and then the ejection force can be only applied to the single position of part, make the area bear far higher than other parts Stress problem, can avoid the necking phenomenon generated when stress exceeds material yield strength even exceeds tensile strength and leads to cracking.