Induction heating with the ring effect for injection molding plates

An induction heating-assisted injection molding (IHAIM) process developed by the authors is used to replicate surfaces containing random nano-patterns. The injection molding setup is developed so that an induction heating system rapidly heats the cavity wall at rates of up to 10°C/s. In order to enable the optimization of the IHAIM process for nano-pattern replication, it is necessary to develop robust methods for quantitative characterization of the replicated nano-patterns. For this purpose, three different approaches for quantitative characterization of random nano-patterns are applied and compared. Results show that the use of IHAIM is an efficient way to improve replication quality. All three measurement methods are capable of detecting the trend of the replication quality of the surface changing the process condition.

Download Full-text

Modeling a working coil coupled with magnetic flux concentrators for barrel induction heating in an injection molding machine

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2015.02.057 ◽

2015 ◽

Vol 86 ◽

pp. 16-30 ◽

Cited By ~ 24

Author(s):

Huy-Tien Bui ◽

Sheng-Jye Hwang

Keyword(s):

Injection Molding ◽

Magnetic Flux ◽

Induction Heating ◽

Molding Machine ◽

Injection Molding Machine

Download Full-text

Numerical Simulation of Temperature Field in Barrel of Injection Molding Machine during Induction Heating Process Based on ANSYS Software

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.87-88.16 ◽

2009 ◽

Vol 87-88 ◽

pp. 16-21 ◽

Cited By ~ 1

Author(s):

Shi Jia Chang ◽

Peng Cheng Xie ◽

Xue Tao He ◽

Wei Min Yang

Keyword(s):

Electromagnetic Field ◽

Temperature Field ◽

Injection Molding ◽

Induction Heating ◽

Heating Process ◽

Magnetic Vector Potential ◽

Ansys Software ◽

Molding Machine ◽

Injection Molding Machine ◽

Field Problem

A finite element model of temperature field coupled with electromagnetic field has been established based on induction heating theory including Maxwell’s equations, thermal conductivity differential equation and magnetic vector potential to simulate the induction heating process of barrel of injection molding machine by universal ANSYS software, and to obtain temperature field of the barrel related to time variation. The coupled thermal and electromagnetic field problem taking account of nonlinear materials characteristics related to temperature was discussed. The induction heating process of barrel was analyzed, and the temperature distribution and its variation with time were obtained.

Download Full-text

A method for more accurate calculation of the ring effect in cylindrical inductors for induction heating

10.1109/icoecs52783.2021.9657312 ◽

2021 ◽

Author(s):

Lyubov Roginskaya ◽

Anton Gorbunov ◽

Denis Gusakov ◽

Zulfiya Yalalova ◽

Anton Mednov

Keyword(s):

Induction Heating ◽

Accurate Calculation ◽

Ring Effect

Download Full-text

Injection Molding for a Ultra Thin-Wall Part using Induction Heating

Transactions of the Korean Society of Mechanical Engineers A ◽

10.3795/ksme-a.2008.32.6.481 ◽

2008 ◽

Vol 32 (6) ◽

pp. 481-487 ◽

Cited By ~ 5

Author(s):

Keun Park ◽

Sun Choi ◽

Se-Jik Lee ◽

Young-Seog Kim

Keyword(s):

Injection Molding ◽

Induction Heating ◽

Thin Wall ◽

Thin Wall Part

Download Full-text

Experimental rapid surface heating by induction for injection molding of large LCD TV frames

Journal of Polymer Engineering ◽

10.1515/polyeng-2013-0243 ◽

2014 ◽

Vol 34 (2) ◽

pp. 173-184 ◽

Cited By ~ 3

Author(s):

Shih-Chih Nian ◽

Che-Wei Lien ◽

Ming-Shyan Huang

Keyword(s):

Standard Deviation ◽

Injection Molding ◽

Heating Rate ◽

Induction Heating ◽

Simulation Software ◽

High Heating Rate ◽

Mold Surface ◽

Temperature Uniformity ◽

Heating Efficiency ◽

High Heating

Abstract The use of electromagnetic induction heating on achieving high mold temperature has been proven to effectively improve the appearance quality of injection molded parts. However, until now, the method has only successfully been used on heating small mold surfaces. This study aims to apply the method on a large injection mold that is used for producing 42-inch LCD TV frames. With the goals of achieving heating efficiency and uniformity, the main focus in this research is designing the induction coil. Initially, three types of induction coils – a single-layered coil with currents that flow in one direction, a single-layered coil with currents that flow in opposite directions, and a two-layered coil – were compared to confirm their heating rates; the best one was then chosen. Additionally, evaluation of various induction coils was preceded with commercial simulation software that supports electromagnetic and thermal analyses. An experiment involving heating a simple workpiece with a heated area similar to that of the male mold plate of the LCD TV frames was conducted to confirm its heating rate and uniformity. Real injection molding LCD TV frames assisted with induction heating was then carried out. Experimental results depicted that: (1) a single-layered coil with currents that flow in one direction performed best; (2) that it heated the simple workpiece at a high heating rate of 5.5°C/s with reasonable temperature uniformity (standard deviation: 5.1°C); and (3) induction heating of a 42-inch LCD TV frame mold surface in practical injection molding provided a high heating rate of 4.5°C/s with favorable temperature uniformity (standard deviation: 4.0°C).

Download Full-text

Estimate the Melt Flow Length with Internal Induction Heating for the Injection Molding Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.863.97 ◽

2020 ◽

Vol 863 ◽

pp. 97-102

Author(s):

Huynh Duc Thuan ◽

Tran Anh Son ◽

Pham Son Minh

Keyword(s):

Temperature Distribution ◽

Injection Molding ◽

Heating Rate ◽

Induction Heating ◽

Heating System ◽

Mold Temperature ◽

Heating Process ◽

Injection Molding Process ◽

Molding Process ◽

Internal Induction

In this paper, an induction heating system was applied to the heating stage in the injection molding process. Through simulation and experiment, the heating process was estimated by the temperature distribution and the heating rate. In the simulation, the mold temperature was increased from 30°C to 180°C in 9 s. Therefore, the heating rate was higher than 16°C/s, which represents a positive result in the field of mold heating. Additionally, the temperature distribution revealed that the higher temperature is concentrated on the gate area, while the outside of the mold cavity is at a lower temperature. The same parameters were applied to both the experiment and the simulation, and the results were in good agreement.

Download Full-text