A mold cavity pressure and temperature control device

Abstract

The invention discloses a mold cavity pressure and temperature controlling device and method. The mold cavity pressure and temperature controlling device includes an external gas connecting system, avalve pipeline system, a heat exchange system for controlling the gas temperature of a mold cavity, an efficient self-circulating device for controlling the circulation of the heated high temperaturegas, an intelligent adjusting device capable of monitoring the relevant parameters of the pressure in the injection molding of the mold cavity and intelligently adjusting the device internal volume, and a program controlling system connected with the valve pipeline system, the heat exchange system and the efficient self-circulating device. During injection molding, the heated or cooled gas is directly injected into the injection molding mold cavity through the heat exchange, the gas pressure in the mold cavity is adjusted, the inner surface temperature of the mold cavity and the surface temperature of the resin entering the mold cavity are adjusted, the precise control of the rapid stability of the pressure of the mold cavity can be achieved, the fixed-speed exhaust is achieved, the circulating high temperature pressure-reverse gas can quickly heat the mold cavity surface, the function of pressure reversing is achieved, the efficiency of heating mold surface is improved, and the preparation of the high surface quality foaming products is achieved.

Description

technical field [0001] The invention belongs to the field of plastic injection molding, in particular to a mold cavity pressure and temperature control device. Background technique [0002] Micro-foaming is an important way to reduce the weight of plastic parts, but the surface quality of micro-foaming products is poor, and generally cannot be directly used for appearance parts, which limits the large-scale application of micro-foaming technology. A large number of researches have been carried out at home and abroad for surface quality problems, and the most effective methods are gas back pressure technology and dynamic mold temperature technology. [0003] At present, ZL201010278060.1 combines gas back pressure and dynamic mold temperature system, including two sets of independent gas back pressure supply unit and high temperature gas supply unit. The high temperature gas supply unit mainly heats the mold cavity surface, and the back pressure gas supply unit Provide back p...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that in the current injection molding system of plastic products, the high-temperature supply unit does not consider the gas recovery and utilization, and only the single gas back pressure fills the cavity, the heating efficiency is low and the heating effect on the mold surface is extremely limited. The stability of the gas pressure in the cavity is poor, and the gas discharge rate cannot be precisely controlled at a fixed speed. Products are prone to pits and other product surface defects caused by back pressure gas. A mold cavity pressure and temperature control device is proposed. During the injection molding process, circulating heating can be carried out at the same time to keep the temperature of the mold surface stable.

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