Variable-temperature circulating system and variable-temperature circulating method of injection mold

A technology of injection mold and circulation system, which is applied in the variable temperature circulation system and the field of variable temperature circulation of injection molds, and can solve problems such as shrinkage, obvious weld lines, and internal stress that cannot be eliminated

Inactive Publication Date: 2016-11-09
江苏文光模具技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Plastic injection molding products play a very important role in various industries of the national economy such as agriculture, national defense construction, transportation, instrumentation, etc., but according to the traditional injection molding process, there are inherent deficiencies, and the formed products inevitably exist. Many defects, such as poor product precision, lack of material (cavity is not filled), shrinkage, surface depression, obvious weld lines, large internal stress of the product, cracking during demoulding or use, etc.
Most of the above-mentioned defects are caused by the injection molding process itself. For example, most polymer melts have high viscosity, and the mold is forcibly filled in the low-temperature mold cavity, and the internal stress cannot be eliminated due to rapid cooling under high shear stress.
The current conventional practice is to use a mold temperature controller to raise the mold to a certain temperature during the injection molding of the mold, which can improve the flow properties of the plastic melt and reduce the internal stress of the product, but because of the factors of the injection molding cycle, Therefore, the temperature of the mold cannot be raised too high, which restricts the further improvement of the melt fluidity and the reduction of the internal stress of the product.

Method used

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  • Variable-temperature circulating system and variable-temperature circulating method of injection mold

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0016] see figure 1 , a temperature-variable circulation system for an injection mold, comprising a thermal oil circulation module and a cold oil circulation module, the thermal oil circulation module comprising a thermal oil tank 3, a thermal oil pump 2, an electric heater 6, a first thermometer T1, a thermal Oil flow regulating valve 8-1, first solenoid valve 9-1, heating equipment 1, third solenoid valve 9-3, third solenoid valve 9-3 is connected to hot oil tank 3 through oil pipe, third solenoid valve 9 -3 is connected in parallel with the first manual control valve 10-1; the cold oil circulation module includes a cold oil tank 5, a cold oil pump 4, a cold oil flow regulating valve 8-2, a second electromagnetic valve 9-2, and a heat Equipment 1, the second thermometer T2, the fourth solenoid valve 9-4, the fourth solenoid valve 9-4 is connected to the co...

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Abstract

The invention discloses a variable-temperature circulating system and a variable-temperature circulating method of an injection mold. Different mold temperatures can be obtained in different time periods in an injection molding process. According to the circulating system disclosed by the invention, high-temperature and high-heat-conductivity oil is used as a heat transfer medium; a hot oil pump and a cold oil pump which have the same flow rate are used; and different temperature requirements of an injection molding process are realized by switching cold and hot oil paths entering heat utilization equipment and controlling different oil temperatures of the injection mold injected into the heat utilization equipment.

Description

technical field [0001] The invention relates to a temperature changing system and a temperature changing method of an injection mold. Background technique [0002] Plastic injection molding products play a very important role in various industries of the national economy such as agriculture, national defense construction, transportation, instrumentation, etc., but according to the traditional injection molding process, there are inherent deficiencies, and the formed products inevitably exist. There are many defects, such as poor product precision, lack of material (cavity not filled), shrinkage, surface depression, obvious weld lines, large internal stress of the product, cracking during demoulding or use, etc. Serious problems. Most of the above-mentioned defects are caused by the injection molding process itself. For example, most polymer melts have high viscosity, and the mold is forcibly filled in the low-temperature mold cavity, and the internal stress cannot be elimina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/78B29C45/73
CPCB29C45/78B29C45/73B29C2945/76531B29C2945/76732B29C2945/76859
Inventor 邬新桥卢建生薛峰陈栗刘伟束伟军宋栗栗戎煜张静周樱
Owner 江苏文光模具技术有限公司
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