Adaptive model following control of the mold filling process in an injection molding machine

Chu, Cheng-Ping; Wei, Jong-Hwei; Shih, Ming‐Chang

doi:10.1002/pen.760311509

Cited by 22 publications

(7 citation statements)

References 11 publications

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“…Kamal et al [11] designed a simple controller based on a first-order-plus-deadtime approximation of the pressure dynamics. This type of transfer functions has been widely used for control design [12][13][14][15]. Similar transfer function models for IMMs can also be found in [16][17][18][19][20][21][22].…”

Section: Literature Surveymentioning

confidence: 97%

Control-oriented modeling of servo-pump driven injection molding machines in the filling and packing phase

Froehlich

Kemmetmüller

Kugi

2018

Mathematical and Computer Modelling of Dynamical Systems

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Servo-valves or variable displacement pumps are typically used to control conventional hydraulic injection molding machines (IMMs). Recent developments in electrical drive technology allow to utilize servo-motor driven pumps instead, which is beneficial due to their higher energy efficiency. Their dynamic behavior, however, is significantly different compared to the conventional setup. Thus, currently used mathematical models and control concepts cannot be directly applied. This paper presents a computationally efficient and scalable mathematical model of the injection process for these servo-pump driven IMMs. A first-principles model of the injection machine is combined with a phenomenological model describing the injection process, i.e. the compression of the melt and the polymer flow into the mold. The proposed model is tailored to real-time applications and serves as an ideal basis for the design of model-based control strategies. The feasibility of the proposed model is demonstrated by a number of different experiments. They confirm a high model accuracy over the whole operating range for different mold geometries. ARTICLE HISTORY

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Section: Literature Surveymentioning

confidence: 97%

Control-oriented modeling of servo-pump driven injection molding machines in the filling and packing phase

Froehlich

Kemmetmüller

Kugi

2018

Mathematical and Computer Modelling of Dynamical Systems

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“…If σ is PM Then u is PM R 3 If σ is PS Then u is PS R 4 If σ is ZR Then u is ZR R 5 If σ is NB Then u is NB R 6 If σ is NM Then u is NM R 7 If σ is NS Then u is NS (a) σ u R 1 If σ is PB Then u is NS R 2 If σ is PM Then u is NM R 3 If σ is PS Then u is NB R 4 If σ is ZR Then u is ZR R 5 If σ is NB Then u is PS R 6 If σ is NM Then u is PM R 7 If σ is NS Then u is PB (b) I (i.e. u 1 = u 11 + u 21 ) and the overall control input u 2 of LSC is the combination of the control input of the energy-saving controller and the decoupling compensator II (i.e.…”

Section: Controller Designmentioning

confidence: 99%

Integrated control of clamping force and energy-saving in hydraulic injection moulding machines using decoupling fuzzy sliding-mode control

Chiang

Yeh

Yang

et al. 2005

Int J Adv Manuf Technol

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The objective of this research is to implement a novel parallel control of clamping force and energy-saving in hydraulic injection moulding machines (HIMMs) in order to simultaneously achieve accurate force control response and high energy efficiency. In order to verify the feasibility of the integrated control system and compare energy-saving effects, the clamping force control of HIMMs can be integrated with two different energy-saving control systems or integrated with a conventional hydraulic system without energy-saving control. The overall control system is a coupled two-input two-output system. Therefore, a decoupling fuzzy sliding-mode control (DFSMC) strategy, which can reduce the fuzzy rule numbers and counteract the coupling effects, is developed for the integrated control of HIMMs. The experimental results show the outstanding performance of the parallel control in HIMMs with DFSMC.

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“…[6,7] Ping et al dynamically controlled the cavity pressure using an adaptive control model. [8] Smud et al implemented a closed-loop control system based on a PI-controller for the regulation of the pressure within the mold during the cooling phase with the aim to optimize the geometrical part properties. [9] At the IKV, different concepts for quality assurance and process control for the injection-molding process have been developed.…”

Section: Introductionmentioning

confidence: 99%

Development of a novel control strategy for a highly segmented injection mold tempering for inline part warpage control

Hopmann

Kahve

Schmitz

2020

Polymer Engineering & Sci

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The demand of precise injection-molded parts is steadily increasing and is today one of the most relevant challenges, due to local variations in temperature and pressure during the production of the part. These variations can lead to a significant change of the local specific volume, shrinkage potential, and inner stress, which ultimately results in part warpage. By homogenizing the local specific volume over the part according to the specific pvT-behavior of the polymer, warpage is expected to be reduced. The following work describes a new approach to control the local specific volume by a newly developed segmented and highly dynamic mold temperature control based on rapid heating ceramics and CO 2 evaporation chambers. Since injection molding is a dynamic process and heat transfer inside the mold is comparably slow, a special control strategy is necessary to activate the heating and cooling elements in advance. For this, a novel prediction strategy based on a discretization of the onedimensional heat equation has been developed. Experimental trials including a classical PID controller and a model predictive control approach (MPC) show that the MPC is superior regarding the process stability.

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Adaptive model following control of the mold filling process in an injection molding machine

Cited by 22 publications

References 11 publications

Control-oriented modeling of servo-pump driven injection molding machines in the filling and packing phase

Control-oriented modeling of servo-pump driven injection molding machines in the filling and packing phase

Integrated control of clamping force and energy-saving in hydraulic injection moulding machines using decoupling fuzzy sliding-mode control

Development of a novel control strategy for a highly segmented injection mold tempering for inline part warpage control

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