Plunger type precise injection device

Abstract

The invention relates to a plunger type precise injection device. A plunger rod capable of reciprocating is arranged in a material barrel. The material barrel is composed of a material barrel front end, a material barrel middle end and a material barrel rear end which are sequentially connected and externally further provided heating rings. A feeding port is formed in the material barrel rear end. First piezoelectric ceramics and second piezoelectric ceramics are arranged between the material barrel front end and the material barrel middle end and are connected through a first electrode. The first piezoelectric ceramics are composed of two piezoelectric zones opposite in polarization direction. The polarity of the second piezoelectric ceramics is opposite to the polarity of the first piezoelectric ceramics. Third piezoelectric ceramics and fourth piezoelectric ceramics are arranged between the material barrel middle end and the material barrel rear end and are connected through a second electrode. The third piezoelectric ceramics and the fourth piezoelectric ceramics are different in polarization direction. By means of the plunger type precise injection device, full injection of a die cavity can be smoothly and evenly achieved under the low pressure and temperature, plasticizing is uniform, air holes and warping are avoided, the product injection precision and efficiency are improved, and energy consumption and cost are reduced.

Description

technical field [0001] The invention belongs to precision manufacturing technology, in particular to a plunger type precision injection device. Background technique [0002] With the rapid development of high-tech, plastic micro-injection molding products show a rapidly growing demand in the fields of optical communication, computer data storage, medical and biotechnology, micro-optical devices, electronics and consumer products. Plastic micro-injection molding is used to produce products whose overall size or characteristic functional area size is required to be measured in millimeters or even microns. Due to the various advantages of injection technology and the oxidation resistance, corrosion resistance, easy molding, and higher specific strength of polymer materials than other materials The advantages of plastic micro-injection molding technology based on polymer materials have developed rapidly. [0003] In the above-mentioned fields, there is a huge difference in the ...

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Problems solved by technology

[0003] In the above-mentioned fields, there is a huge difference in the overall or partial size of fine plastic products and traditional plastic products, which leads to great changes in the main factors affecting the injection molding process, and it will be difficult to use traditional injection technology

When traditional injection technology is used to inject micro products, due to the high viscosity of the polymer material melt of plastic parts, it is difficult to fill the mold cavity smoothly even under high pressure, the plasticization is uneven, and the plastic parts are easy to form pores. Residual stress generated by elastic turbulence and melt fracture can easily lead to product surface warping, which cannot meet high precision requirements

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