An injection mold for easy exhaust

Abstract

The invention belongs to the technical field of injection moulds, in particular to an injection mold that is convenient for exhausting; it includes an upper mold and a lower mold, the bottom of the upper mold is provided with a lower mold; the bottom surface of the upper mold is close to the side of the upper mold The position is fixedly connected with a guide rod; a cavity is jointly opened between the upper mold and the lower mold, and the inside of the cavity is used for injection molding products; the bottom surface of the upper mold is provided with a gate at the top of the cavity; The top surface of the lower mold is provided with a chute at the bottommost position of the product; the inside of the chute is slidably connected with a slider; through the present invention, the automatic negative pressure of the inner cavity of the injection mold is effectively realized, which promotes the plastic It automatically flows away from the gate to ensure that the plastic from the gate can still fully fill the cavity when the pressure of the plastic is relatively low, avoiding the problem of material shortage. At the same time, there is no need for high-pressure jet injection, which avoids a large amount of trapped air inside Problems and promote exhaust, greatly improving the quality of the product.

Description

technical field [0001] The invention belongs to the technical field of injection moulds, in particular to an injection mould which is convenient for exhausting. Background technique [0002] Injection mold is a tool for producing plastic products, and it is also a tool for imparting complete structure and precise dimensions to plastic products. By injecting heated and melted plastic into the cavity of the injection molding machine at high pressure, after cooling and solidifying, the molded product is obtained. [0003] According to N109016397B, an injection mold is easy to exhaust and can improve the injection quality. The exhaust groove of the invention has the characteristics of automatic closing. When the injection mold is not used, the injection mold can be erected, and the exhaust groove is automatically closed, which can prevent long When the injection mold is not used for a long time, the accumulation of fine particles in the exhaust slot leads to the blockage problem...

AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, when the hot-melt plastic is introduced into the cavity through the gate, the hot-melt plastic needs to flow and fill inside the cavity, and finally the entire cavity is completely filled, but when pouring, If the internal pressure of the gate is low, the plastic will flow slowly and the gas inside the cavity can be completely evacuated, but when the internal pressure of the gate is high, the plastic will flow faster inside the cavity, which will Quickly fill the cavity, but because the flow rate of the plastic is too fast, part of the gas inside the cavity will blend into the inside of the plastic, and if the inside of the plastic contains water vapor, it will also make the inside of the plastic residual gas, on the one hand It is easy to cause the product to be short of materials, and on the other hand, it will cause the product to burn, causing the product to be scrapped and other problems

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