Fully sealed mold ultra-high vacuum die-casting and injection molding device and operation method

Abstract

The invention relates to a fully sealed mold ultra-high vacuum die-casting and injection molding device and an operation method. A mold sealing box is arranged outside a mold in an ordinary die-casting and injection molding machine, a feed inlet of a mold cavity is provided with a sealing plug, and a micromesh screen is arranged in a vacuum-pumping pipe orifice of the mold cavity. A vacuum-pumping device is started for pumping out air in the sealing box and the mold cavity, liquid metal or plastic which is molten at high temperature firstly breaks through the sealing plug of the feed inlet from the feed inlet, smoothly flows into the mold cavity in an ultra-high vacuum state and flows in the ultra-high vacuum mold cavity in an accelerated manner, the cavity is rapidly filled with the liquid metal or the plastic for casting a workpiece, and when metal or plastic liquid which is molten at the high temperature is in contact with the edge of the vacuum-pumping pipe orifice of the mold cavity, the metal liquid or the plastic liquid is blocked by the micromesh screen arranged in the vacuum-pumping pipe orifice of the mold cavity for preventing the molten metal liquid or the plastic liquid from blocking a vacuum pipeline. A product which is formed by die-casting and injection molding through the device disclosed by the invention has the advantages of high precision, lower air hole level and high finished product rate.

Description

technical field [0001] The invention relates to a vacuum die-casting injection molding device and an operating method, in particular to an ultra-high vacuum die-casting injection molding device and an operating method of a fully sealed mold. Background technique [0002] Vacuum die casting, injection molding apparatus and methods of operation have been widely used in the field of metal and plastic casting. [0003] There are many methods of vacuum die-casting and injection molding. The technical core of vacuum die-casting and injection molding is how to seal the mold and improve the vacuum degree in the mold cavity. The latest research results show that the higher the vacuum degree in the mold cavity, the better the fluidity of molten metal or plastic liquid in the mold cavity, and the lower the level of pores in metal or plastic castings. At present, the main factors that affect the improvement of the vacuum degree in the mold cavity are: 1. The mold is not completely seal...

AI Technical Summary

Problems solved by technology

At present, the main factors affecting the improvement of the vacuum degree in the mold cavity are: 1. The mold is not fully sealed

With the continuous improvement of the vacuum degree in the mold cavity, the air in the tiny gap between the casting thimble of the die-casting machine and the injection molding machine and the movable mold is attracted by the high vacuum in the mold cavity to generate high-speed airflow into the mold cavity, and the airflow directly Impact the molten metal or plastic liquid in the mold cavity, causing turbulent flow of the molten metal or plastic liquid in the mold cavity to generate air holes, which affects the quality of the product, and the airflow entering the mold cavity and the metal or plastic casting are affected by high temperature. Oxidation occurs under the influence of product quality

2. There is no sealing device at the feed port of the mold cavity

When the molten metal or plastic liquid is injected into the mold cavity from the feed port, the air outside the mold also enters the mold cavity, which reduces the vacuum in the mold cavity, which is far from the state of ultra-high vacuum , affect the effect of vacuum die casting and injection molding

3. There is no molten metal liquid or plastic liquid barrier device at the vacuum port of the mold cavity

Under the action of high vacuum, the molten metal liquid or plastic liquid can easily enter the vacuum pipe from the vacuum port of the mold cavity and block the vacuum pipe, causing production accidents

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