Bumper Moulding Tool

Technical points for bumper moulds——parting line solution

 

The picture tells the connection position for inner&outer parting lines at pull deformation area of front bumper,which is at the bottom part for assembly but visual blind. This area with wide side wall makes it harder to pull deformation,so to shift inner-parting to ourter parting within L(L≤50mm)

The section part as showed above has two status at Y direction.One is side turn-up is internal closed at Y direction(pull deformation undercut at horizontal direction),and part at arrow area will be damaged by cavity due to the undercut(red parting line),so better to design a push-pull block along the internal closure.The other is side turn-up has draft angle at Y direction and push-pull block can make pull deformation at horizontal direction.

 

Second-orbit-change guide rail system for inner parting bumper moulding tool ( inner slider mechanism with hidden parting line) is what we use normally and skillfully. Hengji bumper mold making uses such control system to have bumper perfectly injection molded that the appearance quality is guaranteed, and more importantly, process procedures and cost are reduced.
Bellow are four moving track models for push&pull blocks, which are set single or combined in a mold. If there is time, we can discuss about more details for application person to person.

Firstly,nitrogen spring with slide lock set ascends 50mm then slide lock gets off, as soon as the product pulls itself deformed by undercut the bumper mould tooling cavity departs. Secondly, As ejected to 100mm, core pulling block goes along guide track then bottom hole core pulling and eyebrow install platform undercut core pulling successively accomplished finally bumper two ends' undercut turn-ups all get off. Thirdly, ejector plate first-stage departs and the big ejector block ejects 70mm, so the slide between ejector and lifter finishes core pulling. Fourthly, ejector plate second-stage departs and ejects another 105mm, and core pulling mechanism on the big ejector block finishes the last core pulling of product driven by ejector.

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