Fast Numerical Algorithm for Optimization Mold Shape of Direct Injection Molding Process

Jeng, Y.H.; Liu, De‐Shin; Yau, Hong-Tzong

doi:10.1080/10426914.2012.727119

Cited by 9 publications

(5 citation statements)

References 11 publications

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“…The experimental results, as well as their statistical processing, have shown that a connection radius between the walls of the parts that is as large as possible can cause a reduction in certain tendencies to crack the material. In addition, an appropriate angle of inclination or an optimal ratio between the thicknesses of the walls determines a reduction in the agglomerations of material that can cause inhomogeneities of the structure [ 36 , 37 ].…”

Section: Resultsmentioning

confidence: 99%

Redesign of the Geometry of Parts Produced from PBT Composite to Improve Their Operational Behavior

Dobrotă

Lazăr²

2021

Polymers

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Parts produced from PBT-GF30 (70% polybutylene terephthalate +30% fiberglass) are very often used in car construction, due to the properties of this material. The current trend is to make parts with a shape designed to be as complex as possible, to take over many functions in operation. During the research, a part that is a component of the structure of car safety systems, and that must be completely reliable in operation, was analyzed. This piece has a complex shape that involves the intersection of several walls. Thus, the research aimed at establishing the optimal radius of connection between the walls (R), the ratio between the thickness of the intersecting walls (K) and the angle of inclination of the walls (α). The composite central design method was used to design the experiments. Both new parts and parts subject to an artificial aging process were tested. All parts were subjected to shear stress, to determine the load (L) and displacement (D) at which they break. In order to observe other changes in the properties of the parts, in addition to the mechanical ones, an analysis of the color of the new and aged parts was performed, as well as a topography of the surface layer in the breaking area. The design of the parts involved changes to the parameters of the injection process. In these conditions, a PBT-GF30 viscosity analysis was performed for new and artificially aged parts.

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Section: Resultsmentioning

confidence: 99%

Redesign of the Geometry of Parts Produced from PBT Composite to Improve Their Operational Behavior

Dobrotă

Lazăr²

2021

Polymers

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“…Some technologies, such as knitting [3], where the upper of the shoe is made in one piece, the knitting machine is loaded with polyester, nylon or spandex fibres; 3DPrinting [4], this technology is also used to print some parts of the shoe in plastic; direct injection moulding [5] of shoe parts easily automates this stage. The 3DBonding [6] technology is characterised by the injection of polymer into a mould to produce the shoe.…”

Section: Automation In the Shoe Industrymentioning

confidence: 99%

Optimization of the pick and place sequence of a bimanual collaborative robot in an industrial production line

Méndez,

Perez-Vidal,

Segura

2023

Preprint

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This paper focuses on optimizing pick-and-place tasks performed by a dual-arm collaborative robot in a specific shoe manufacturing industry environment. The robot must identify the parts of a shoe placed on a tray, pick them up, and place them in a shoe mold for further processing. The shoe parts arrive on the tray in random positions and angles and can be picked up in a different order. Optimizing these tasks could increase the assembly speed of each unit and improve shoe production. To achieve this goal, a mathematical model based on binary integer linear programming (BILP) has been developed. This model determines the optimal sequence for picking and placing the shoe parts in the mold, thus minimizing the time required for picking and decision-making. The effectiveness of this approach has been tested using two 3-piece unit shoe models: one for training and another for validation. These models encompass a total of 500 trays. An analysis of the results reveals that BILP offers advantages for task motion planning in complex environments with multiple trajectories and the potential for collisions between arms. The model's generalizability to shoes with n assembly parts further confirms its robustness for various part counts.

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“…Each piece is classified according to its position and orientation for searching a relation when the pieces are in a nearby area and reducing the number of different trajectories which should be programmed. The vision workspace is divided into four quadrants (1,2,3,4)…”

Section: E Image Processing System and Piece Featuresmentioning

confidence: 99%

“…Current production processes in the shoe industry are characterized by high material consumption and low automation of production lines, but some technologies such as Knitting [1], 3DPrinting [2], Direct Injection [3] or 3DBonding [4] are increasing the level of automation in the shoe industry. 3DBonding joins pieces of different materials by injecting polyurethane through a network of channels previously created inside a mould.…”

Section: Introductionmentioning

confidence: 99%

Robotic Pick-and-Place Time Optimization: Application to Footwear Production

et al. 2020

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Fast Numerical Algorithm for Optimization Mold Shape of Direct Injection Molding Process

Cited by 9 publications

References 11 publications

Redesign of the Geometry of Parts Produced from PBT Composite to Improve Their Operational Behavior

Redesign of the Geometry of Parts Produced from PBT Composite to Improve Their Operational Behavior

Optimization of the pick and place sequence of a bimanual collaborative robot in an industrial production line

Robotic Pick-and-Place Time Optimization: Application to Footwear Production

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