A mold internal pumping mechanism

Abstract

The present invention relates to an inner-pulling mechanism for a mold, which includes an insert and an insert that are arranged on the cavity, the insert is provided with a hole for one end of the insert to pass through, and also includes a hole for inserting the insert during injection molding. One end of the core pushes out the insert, and when the cavity comes out, one end of the insert is retracted into the shrinking mechanism in the insert. In the invention, the shrinking mechanism is arranged in the cavity, so that the insert core can be extended or retracted into the cavity to realize the release of the undercut, which solves the problem of undercut inside the deep cavity mold, and can avoid the weak inclined top when the undercut is pulled out. Or the cavity is weak, and the holes and grooves machined on the cavity in the present invention are small, which ensures the strength of the cavity. The hole and groove of the invention are simple to process on the cavity and easy to install, which greatly saves the processing time and the research and development time of the technicians.

Description

technical field [0001] The invention relates to an internal drawing structure, in particular to an internal drawing mechanism of a mold. Background technique [0002] In injection molds, the undercut in the cavity is generally solved by using a slanted top and a T-shaped slider. However, in the case of a large mold or a deep cavity, the slanted top may be made slender and the T-shaped slider It will cause the core to be relatively weak and the strength is not good. [0003] For such medium and large molds, the main disadvantage of using inclined top or inner drawing slider is that the inclined top is slender, and it is not easy to guide, and it is easy to bend and deform during processing, resulting in difficulties in research and matching. Furthermore, in the process of ejection, due to the long ejection distance, the inclined top is easy to deflect, making it difficult to reset, and it is also easy to break the inclined top. If guides are added to the inclined top, the mo...

AI Technical Summary

Problems solved by technology

[0002] In injection molds, the undercut in the cavity is generally solved by using a slanted top and a T-shaped slider. However, in the case of a large mold or a deep cavity, the slanted top may be made slender and the T-shaped slider It will cause the core to be relatively weak and the strength is not good

[0003] For such medium-sized and large molds, the main disadvantage of using inclined top or inner drawing slider is that the inclined top is slender and not easy to guide, and it is easy to bend and deform during processing, which makes it difficult to develop and match.

Furthermore, in the process of ejection, due to the long ejection distance, the inclined top is easy to deflect, making it difficult to reset, and it is also easy to break the inclined top. If guides are added to the inclined top, the mold processing is difficult, and the processed cavity The accuracy is difficult to guarantee; if a T-shaped slider is used, in order to ensure the strength of the T-shaped slider and facilitate installation, the core will be hollowed out, resulting in insufficient core strength, which will reduce the service life of the mold

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