Three-stage horn gate

Abstract

The invention discloses an Anti-mold drawing three-section type horn gate. The horn gate is shaped like a horn-type curved cone, and the cross section dimension of the horn gate gradually decreases. The horn gate comprises a front-end gate, a first gate, a second gate and a third gate, wherein the front-end gate is arranged at a joint of the horn gate and a product; the first gate is connected with the front-end gate; the center line of the first gate is a first arc which is in smooth transition with the center line of the front-end gate; the second gate is connected with the first gate; the center line of the second gate is a second arc which is in smooth transition with the first arc; the third gate is connected with the second gate; the center line of the third gate is a third arc which is in arc transition with the second arc. The horn gate has the advantages that effective de-molding is realized; the horn gate is difficult to deform or break during ejection; the product quality can be improved; the situations that products are easy to recess by drawing and easy to deform are prevented; the molding period can be shortened; the productivity is improved.

Description

【Technical field】 [0001] The invention relates to a gate form in a mould, in particular to a three-stage horn gate of an anti-draw mold. 【Background technique】 [0002] In the latent injection, the horn-type latent injection is generally used, and the shape of the horn gate is formed by a smooth arc defining the diameters at both ends. Such as figure 1 As shown, it is the horn gate 10 in the prior art. When the thimble pushes the material head 11 formed in the horn gate 10 upwards, it moves along the arc direction of the upper surface 12 of the mold cavity, although the horn gate 10 has a smooth shape, but the friction area between the material head 11 and the upper surface 12 of the cavity is about 2 / 3 of the upper surface of the cavity wall, so that the material head 11 is not smooth when demoulding, and the material head 11 is not smooth during the ejection process. The material head 11 is easily deformed and broken, which will also cause the formed product to be dented...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, it is the horn gate 10 in the prior art. When the thimble pushes the material head 11 formed in the horn gate 10 upwards, it moves along the arc direction of the upper surface 12 of the mold cavity, although the horn gate 10 has a smooth shape, but the friction area between the material head 11 and the upper surface 12 of the cavity is about 2 / 3 of the upper surface of the cavity wall, so that the material head 11 is not smooth when demoulding, and the material head 11 is not smooth during the ejection process. The material head 11 is easy to deform and break, which will also make the formed product concave and deformed

[0003] In view of this, it is necessary to provide a corner gate, so that the contact area between the head formed in the corner gate and the upper surface of the mold cavity becomes smaller, so that the material head and the corner gate can be demoulded smoothly, and the molding failure is avoided. The product has the problem of stretching film and deformation

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