Improvement of the Injection Mold Process by Using Vibration Through a Mold Accessory

Benítez-Rangel, Juan P.; Trejo-Hernández, Miguel; Morales-Hernandez, Luis A.; Domínguez-González, Aurelio

doi:10.1080/10426910903124902

Cited by 15 publications

(7 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Using a mold based on Archimedes spiral [29] (Figure 10(a)), an injected sample is obtained as depicted in Figure 10(b). Considering its physical properties, the high-density polyethylene (grade PEAD 60120) was chosen and melted in heater sections; then, it was injected in the spiral mold through the mold sprue (Figure 10(c)).…”

Section: Experiments and Resultsmentioning

confidence: 99%

FPGA-Based Multiprocessor System for Injection Molding Control

Munoz-Barron

Morales-Velazquez

Romero-Troncoso

et al. 2012

Sensors

View full text Add to dashboard Cite

Abstract:The plastic industry is a very important manufacturing sector and injection molding is a widely used forming method in that industry. The contribution of this work is the development of a strategy to retrofit control of an injection molding machine based on an embedded system microprocessors sensor network on a field programmable gate array (FPGA) device. Six types of embedded processors are included in the system: a smart-sensor processor, a micro fuzzy logic controller, a programmable logic controller, a system manager, an IO processor and a communication processor. Temperature, pressure and position are controlled by the proposed system and experimentation results show its feasibility and robustness. As validation of the present work, a particular sample was successfully injected.

show abstract

Section: Experiments and Resultsmentioning

confidence: 99%

FPGA-Based Multiprocessor System for Injection Molding Control

Munoz-Barron

Morales-Velazquez

Romero-Troncoso

et al. 2012

Sensors

View full text Add to dashboard Cite

show abstract

“…Ultrasonic oscillation techniques are typically used in polymer processing to solve the problems associated with the viscosity of polymer melts. Ultrasonic vibrations have been applied in a low-frequency range to injection molding screws [1,2] and mold sprues [3], and studies have analyzed the effects of shearing on orientation, crystallization and mechanical properties [4,5]. Ultrasonic vibration has also been applied to the extrusion of composites [6,7], and an ultrasonic measuring technique was used in the injection molding of thermoplastics [8].…”

Section: Introductionmentioning

confidence: 99%

Characteristics analysis and mold design for ultrasonic-assisted injection molding

Yang

Huang

Lin

et al. 2014

Journal of Polymer Engineering

View full text Add to dashboard Cite

This study investigated the use of ultrasonic technology in assisted injection molding (AIM) and mold design. An ultrasonic device installed in a mold was employed to vibrate a melt, thereby converting kinetic energy into thermal energy. This method enabled maintaining the desired temperature in the melt flow, preventing a high level of shear and the formation of a thick frozen layer surrounding the skin layer; thus, the injection molding efficiency was enhanced and the residual stress inside the injection-molded component was reduced. In this study, a flat sample (75 mm × 47 mm × 1 mm) of an ultrasonic-assisted injection mold was developed. An ultrasonic oscillation device 45 mm in diameter was placed in the center of the cavity and used to vibrate a polycarbonate melt at a frequency of 20 KHz. In addition, cavity pressure sensors were positioned at the front and rear of the vibration region to analyze the melt flow behavior under ultrasonic-AIM (UAIM) conditions. The results showed that ultrasonic oscillations can reduce the amount of melt pressure lost through the cavity. The pressure loss of the flat sample used in UAIM was approximately 29% lower than that of the sample used in conventional injection molding (CIM; nonultrasonic-assisted injection); the power of UAIM did not yield substantial effects. Direct ultrasonic oscillations destroyed the melt flow and thermal stresses, therefore, the region exhibited a low stress distribution. Compared with using CIM, using UAIM reduced the average residual stress by 27%. Ultrasonic oscillation affected the surface roughness during melt solidification. When the ultrasonic power was < 70%, no substantial increase in surface roughness was observed; however, when the ultrasonic power > 70%, the surface roughness was 10 times higher compared with that observed using CIM.

show abstract

“…[9] With advances in the industry, control objects have become increasingly complex, and many of these objects have time-varying, nonlinear, and real-time parameters. [10][11][12] Thus, PID controllers are the most common industrial system controllers. In modern digital control systems, it is required to digitize the PID algorithm with stronger and faster calculation components.…”

Section: Introductionmentioning

confidence: 99%

Optimized Digital Proportional Integral Derivative Controller for Heating and Cooling Injection Molding System

Jeong¹,

Kim²,

Lee³

2015

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

-Proportional integral derivative (PID) control is one of the conventional control strategies.Industrial PID control has many options, tools, and parameters for dealing with the wide spectrum of difficulties and opportunities in manufacturing plants. It has a simple control structure that is easy to understand and relatively easy to tune. Injection mold is warming up to the idea of cycling the tool surface temperature during the molding cycle rather than keeping it constant. This "heating and cooling" process has rapidly gained popularity abroad. However, it has discovered that raising the mold wall temperature above the resin's glass-transition or crystalline melting temperature during the filling stage is followed by rapid cooling and improved product performance in applications from automotive to packaging to optics. In previous studies, optimization methods were mainly selected on the basis of the subjective experience. Appropriate techniques are necessary to optimize the cooling channels for the injection mold. In this study, a digital signal processor (DSP)-based PID control system is applied to injection molding machines. The main aim of this study is to optimize the control of the proposed structure, including a digital PID control method with a DSP chip in the injection molding machine.

show abstract

Improvement of the Injection Mold Process by Using Vibration Through a Mold Accessory

Cited by 15 publications

References 15 publications

FPGA-Based Multiprocessor System for Injection Molding Control

FPGA-Based Multiprocessor System for Injection Molding Control

Characteristics analysis and mold design for ultrasonic-assisted injection molding

Optimized Digital Proportional Integral Derivative Controller for Heating and Cooling Injection Molding System

Contact Info

Product

Resources

About