A plastic mold with an automatically separable overflow structure

Abstract

The invention discloses a plastic mold with an automatically separated material overflow structure. A cavity is communicated with a runner through a single-side pouring gate; plastic in the runner enters the cavity after being divided into two strands from the single-side pouring gate and then is gathered at the tail filling end; the plastic mold further comprises the material overflow structure arranged at the tail filling end and a material overflow mandril of the material overflow structure; the material overflow structure comprises a convex boss and a concave boss; the convex boss comprises a material overflow cavity communicated with the cavity; a reverse tunnel gate is formed in one end of the material overflow cavity and is connected with the tail filling end of the cavity; the other end of the material overflow cavity is communicated with a balance pipe; the length of the balance pipe is equal to that of the reverse tunnel gate; a mandril hole is formed between the reverse tunnel gate and the balance pipe; the length of the mandril hole is equal to that of the balance pipe; the material overflow mandril is fixed on a thimble fixing plate. According to the plastic mold, the problem that the product intensity is low because of a dissolving trace is effectively solved, and the problems existing in automatic separation of the material overflow structure are solved.

Description

technical field [0001] The invention relates to a plastic mold with an automatically detachable flash structure. Background technique [0002] 1. Ring-shaped products: [0003] figure 1 It is a schematic diagram of the structure of the product that is required to be produced. Its material is PA66 (nylon 66), and its diameter is 41.4mm. It is required that after injection molding, it cannot break under the condition that it can withstand a certain load during use. [0004] figure 2 Schematic diagram of the traditional one-mold four-cavity mold structure for the production of products, including runner 1, product 2, and single-side gate 3. [0005] image 3 for figure 2 It can be seen from this figure that the plastic enters the cavity of the product along the single-side gate 3 at C and will be divided into two streams, one flows in the direction indicated by the arrow D, and the other flows along the direction indicated by the E arrow. Flow in the direction indicated...

AI Technical Summary

Problems solved by technology

[0008] Figure 8 It is a three-dimensional axonometric view of the product and flow channel produced by the traditional one-mold four-cavity mold. The plastic is in image 3 The fusion at the end F of the filling shown will cause product 2 to form a weld line F' at the intersection of the two plastics. Due to the existence of the weld line F', the plastics will not be bonded too firmly here, and the product 2 at this place Not strong enough to withstand normal working loads

In the process of use, the product will break due to insufficient strength, which is the defect of this mold

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