Comprehensive Online Control Strategies for Plastic Injection Molding Process

Seo, Jaho; Khajepour, Amir; Huissoon, Jan P.

doi:10.1115/1.4027491

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…(9) Changes to process parameters that affect force, such as feedrate and DOC, should be independent from this model, which considers Fig. 7 Overview of deflection analysis com ponents Cq0 +qo = u (11) where C = diag{ 0.035 0.0356}, qa = [x0 y0 ]T, and u = [x, )'; ]T. It is reasonable to assume that the cutting forces have a negligible effect on the axis position accuracy, and that the tool deflection dq introduces the most significant amount of CE. Position errors due to dynamic effects are considered via the position feed back terms, which allow the estimated tool tip position to be given as the sum of axes position error and estimated tool deflection by q = q0 + 5q (12) The estimated tool tip position can be transformed to the task space r = [rc rm ]T defined in Ref.…”

Section: Control Designmentioning

confidence: 99%

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Adaptive Robust Control of Circular Machining Contour Error Using Global Task Coordinate Frame

Davis

Shin

Yao

2015

Journal of Manufacturing Science and Engineering

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The contour error (CE) o f machining processes is defined as the difference between the desired and actual produced shape. Two major factors contributing to CE are axis position error and tool deflection. A large amount o f research work formulates the CE in convenient locally defined task coordinate frames that are subject to significant approximation error. The more accurate global task coordinate frame (GTCF) can be used, but transforming the con trol problem to the GTCF leads to a highly nonlinear control problem. An adaptive robust control (ARC) approach is designed to control machine position in the GTCF, while additionally accounting for tool deflection, to minimize the CE. The combined GTCF/ARC approach is experimentally validated by applying the control to circular contours on a three axis milling machine. The results show that the proposed approach reduces CE in all cases tested.

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Section: Control Designmentioning

confidence: 99%

“…[3] and [9], but can perform poorly or lose stability in the presence of disturbances and nonlinearities. Manufacturing sys tems are often nonlinear, which has lead to the use of nonlinear [10] and adaptive [11] control strategies. Other research consid ered techniques to slow the feed rate when CE grows large [12,13].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Robust Control of Circular Machining Contour Error Using Global Task Coordinate Frame

Davis

Shin

Yao

2015

Journal of Manufacturing Science and Engineering

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“…The qualities of the molded product, such as dimensional stability, appearance, and mechanical properties, are highly dependent on the processing conditions. One of the most critical variables determining the final quality of the product is the mold temperature [2][3][4][5][6]. The mold temperature is dynamic during the injection molding process.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Sink on the Mold Temperature of Gypsum Mold Used in Injection Molding

2020

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Gypsum molds have been developed as an alternative for the Rapid tooling (RT) method used in injection molding. However, the poor capability of the heat delivery forces the gypsum mold to operate under a high-risk condition, and distortion of the molded part becomes apparent. The goal is to investigate the effect of a heat sink on the reduction of the gypsum mold temperature and to establish a methodology for the heat sink design. The methodology used the advantage of the electrical circuit concept to analyze the mold temperature. The heat transfer of a mold was modeled using an equivalent thermal circuit. After all the components on the circuit were determined, the heat transfer rate could then be calculated. Once the heat transfer rate was known, the mold temperature could be easily analyzed. A modified thermal circuit considering transverse heat conduction was also proposed, which estimated the mold temperature more accurately. The mold temperature was reduced by 16.8 °C when a gypsum mold was installed with a 40 mm thick heat sink in a parallel configuration. Moreover, the reduction of the mold temperature improved the deflection of the molded part from 0.78 mm to 0.54 mm. This work provides a quick approach to analyze the mold temperature based on the thermal circuit concept. As the cooling system of the mold was modularized analytically, important properties of the cooling system in the heat transfer process were revealed by analyzing the thermal circuit of the mold, for example, the heat transfer rate or the mold temperature.

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Switch-Based Sliding Mode Control for Position-Based Visual Servoing of Robotic Riveting System

Zhao

Lin

et al. 2016

Journal of Manufacturing Science and Engineering

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The robotic riveting system requires a rivet robotic positioning process for rivet-in-hole insertions, which can be divided into two stages: rivet path-following and rivet spot-positioning. For the first stage, varying parameter-linear sliding surfaces are proposed to achieve robust rivet path-following against robot errors and external disturbances of the robotic riveting system. For the second stage, a second-order sliding surface is applied to attain accurate rivet spot-positioning within a finite time required by the riveting process. In order to improve the dynamic performance of the robot riveting system, the motion of robot end-effector between the two adjacent riveting spots has been properly designed. Overall, the proposed control scheme can guarantee not only the stability of the robot control system but also the robust rivet path-following and quick rivet spot-positioning in the presence of the robot errors and external disturbances of the robotic riveting system. The simulation and experimental results demonstrate the effectiveness of the proposed control scheme.

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Comprehensive Online Control Strategies for Plastic Injection Molding Process

Cited by 3 publications

References 22 publications

Adaptive Robust Control of Circular Machining Contour Error Using Global Task Coordinate Frame

Adaptive Robust Control of Circular Machining Contour Error Using Global Task Coordinate Frame

Influence of Heat Sink on the Mold Temperature of Gypsum Mold Used in Injection Molding

Switch-Based Sliding Mode Control for Position-Based Visual Servoing of Robotic Riveting System

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