scholarly journals Study on Induction Heating Coil for Uniform Mold Cavity Surface Heating

2014 ◽  
Vol 6 ◽  
pp. 349078 ◽  
Author(s):  
Yu-Ting Sung ◽  
Sheng-Jye Hwang ◽  
Huei-Huang Lee ◽  
Durn-Yuan Huang
Keyword(s):  
Induction Heating ◽  
Surface Heating ◽  
Mold Cavity ◽  
Cavity Surface ◽  
Heating Coil

Improving the Properties of Injection Molded Products with Induction Heating and Cooling Molds

2015 ◽  
Vol 9 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Yasuhiko Murata ◽  
◽  
Masayoshi Koike ◽  
Song Pan
Keyword(s):  
Tensile Test ◽  
Surface Temperature ◽  
Induction Heating ◽  
High Impact ◽  
Mold Cavity ◽  
Cavity Surface ◽  
Filling Process ◽  
High Impact Polystyrene ◽  
Heating And Cooling ◽  
Injection Molded

An induction heating and cooling mold that can keep the surface temperature of the entire mold cavity uniform and has a new heating and cooling insert with a gas vent mechanism is designed and produced. The effects of the temperature of the mold cavity surface, of the cavity air during the melt filling process, and of the organic gas generated fromthe melt on the appearance andmechanical properties of an injectionmolded product made of high impact polystyrene are studied. It is found that the heating and coolingmold with a gas vent can suppress molding defects, such as a weld lines and gas burns, and can greatly increase the displacement ratio of molded products obtained in the tensile test. This means that the effects of the gas vent and the surface temperature of the cavity have been quantitatively clarified using this type of mold.

scholarly journals Superconductor design and loss analysis for a 20 MJ induction heating coil

1981 ◽  
Vol 17 (1) ◽  
pp. 908-911 ◽  
Author(s):  
M. Walker ◽  
J. Declercq ◽  
B. Zeitlin ◽  
J. Scudiere ◽  
M. Ross ◽  
...  
Keyword(s):  
Induction Heating ◽  
Heating Coil ◽  
Loss Analysis

Effect of Parasitic Capacitance of PCB-Type Induction Heating Coil and Its Impedance Matching Network Design

2021 ◽  
Vol 24 (10) ◽  
pp. 888-897
Author(s):  
Jaehong Lee ◽  
Junghyeon Roh ◽  
Hyung-Woo Lee ◽  
Hyeong-Seok Oh ◽  
Seung-Hwan Lee
Keyword(s):  
Network Design ◽  
Induction Heating ◽  
Impedance Matching ◽  
Parasitic Capacitance ◽  
Matching Network ◽  
Heating Coil

Effects of process conditions on the heat transfer coefficient at the polymer-mold interface and tensile strength of thin-wall injection molding parts

2019 ◽  
Vol 39 (5) ◽  
pp. 493-500
Author(s):  
Laiyu Zhu ◽  
Liping Min ◽  
Xianglin Li ◽  
Zhanyu Zhai ◽  
Dietmar Drummer ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Tensile Strength ◽  
Weld Line ◽  
Polymer Melt ◽  
Mold Cavity ◽  
Cavity Surface ◽  
Thin Wall ◽  
Wall Injection ◽  
The Heat Transfer Coefficient

Abstract Generally, the strength at the weld line of the injection molded part is very weak. The heat transfer coefficient (HTC) between the polymer melt and the mold cavity surface was analyzed to solve this problem. The surface roughness of the mold cavity and the material of the mold insert were changed to adjust the interface environment between the polymer melt and the mold cavity surface. HTC was obtained by combing the experimental measurement with the theoretical calculation. In the current study, the influence of HTC on the tensile strength of the weld line of the molded specimen was investigated. The results show that the weld line strength of the molded specimen increases with the decrease in HTC between the polymer and the mold cavity surface. Meanwhile, the decrease in the surface roughness of the mold cavity or replacing the mold material with lower thermal conductivity can reduce the value of the HTC between the polymer and the mold effectively and can delay the cooling rate of the hot polymer melt. This provides a new idea to solve thin-wall injection molding weld line defects.

The Effective Measures of Preventing Collapse Angle Problem in Polishing Plastic Mould

2012 ◽  
Vol 538-541 ◽  
pp. 1720-1723
Author(s):  
Yi Lei Ren ◽  
Hong Qi Lin
Keyword(s):  
Preventive Measures ◽  
Dimensional Accuracy ◽  
Machining Process ◽  
Mold Cavity ◽  
Cavity Surface ◽  
Plastic Model ◽  
Plastic Parts ◽  
Surface Angle ◽  
Plastic Mold

Plastic mold polished, in the mold cavity parting collapsed throwing angle appear, which seriously affect the dimensional accuracy and surface quality of the plastic parts, this article proposed two effective preventive measures: (1) cutting the model which having a same size as plastic model of the cavity at the parting surface, sticking the model and cavity parting with 502 glue together, within the required type of alignment, and then thrown together, polished finish will be a model to out; (2) in the plastic model cavity machining process, type in the mold cavity surface set aside allowance 0.5 ~ 1mm, polished until the cavity is completed, the surface of the cavity type 0.5 ~ 1mm rubbed off with a grinding allowance, it will ensure the cavity size and cavity to prevent the collapse of sub-surface angle at the phenomenon.

Multi-Objective Optimization of the Heating Rods Layout for Rapid Electrical Heating Cycle Injection Mold

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Guoqun Zhao ◽  
Xiping Li ◽  
Yanjin Guan
Keyword(s):  
Temperature Distribution ◽  
Injection Molding ◽  
Mold Cavity ◽  
Electrical Heating ◽  
Cavity Surface ◽  
Heating Cycle ◽  
Multi Objective Optimization ◽  
Heating Efficiency ◽  
Multi Objective ◽  
Distribution Uniformity

Rapid electrical heating cycle injection molding (ERHCM) technology is a promising green manufacturing technology for plastic parts. By using this technology, the defects that usually appear on the surface of conventionally injected parts, such as weld and flow marks, can be avoided effectively. This paper studies rapid electrical heating cycle injection molding technology and its mold structure design techniques. Temperature distribution uniformity and heating efficiency on the mold cavity surface are considered as the major influencing factors on product quality and production efficiency. A multi-objective optimization model for the heating rods layout in the mold cavity plate is formulated to optimize temperature distribution uniformity and heating efficiency with respect to the heating rods layout. An application to a liquid crystal display TV panel is implemented successfully using a genetic algorithm.

Optimization of Injection Mold Design Through Application of External Selective Induction Heating

2015 ◽  
Author(s):  
Krzysztof Mrozek
Keyword(s):  
Induction Heating ◽  
Electromagnetic Induction ◽  
Temperature Cycling ◽  
Internal Stresses ◽  
Cavity Surface ◽  
Heating Process ◽  
Injection Mold ◽  
Mold Surface ◽  
Injection Process ◽  
Thin Walled

The aim of the presented research project is to optimize the injection mold for a better quality of thin-walled moldings without significant increase in cycle time, through application of external selective induction heating. The injection process of thin-walled parts is one of the most problematic procedures in plastics processing. Most commonly occurring defects of said parts are: short shots, diesel effect, welding lines, excessive internal stresses and warping. In order to reduce the number of these deficiencies, electromagnetic induction heating in concern with water cooling has been proposed to achieve rapid temperature cycling during the injection process. High-frequency induction is one of the most efficient methods of injection mold surface heating, by virtue of electromagnetic induction effect. The present study investigates selective induction heating of the cavity surface for three different thin-walled parts. Feasibility of the localized heating method was investigated through simulation of melt flow through the heated areas. The latter were selected on the basis of defects occurrence. To evaluate the applicability and efficiency of the induction heating process (within an area of 32×20 mm), a the plate with cooling channels and a movable heated insert were constructed. During the heating process, an inductor with a concentrator and a 10 kW generator. The measurement was performed by means of the Flir T620 thermographic camera and a Pt100 temperature sensor. Preliminary results allowed continuation of the experiment. For this purpose, an injection mold, consisting of three exchangeable cavity inserts on the stamp and matrix side, was assembled. In order to evaluate the applicability of induction heating, the injection process was carried out and its results were compared to those obtained through utilization of conventional means. The investigation showed that selective heating of the cavity surface to 150 °C afforded elimination of the majority of defects.

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