Tilting separation analysis of bottom-up mask projection stereolithography based on cohesive zone model

Wu, Xiaoqing; Lian, Qin; Li, Dichen; Zhang, Jin

doi:10.1016/j.jmatprotec.2016.12.016

Cited by 54 publications

(27 citation statements)

References 16 publications

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“…Once the separation distance reaches the ultimate displacement, the interfaces are completely separated, and interaction force vanishes (Figure 2(c 3 , c 4 )). The model inputs of the heuristic schemes and fitting methods used in simulation are determined through minimizing the error between forces obtained from numerical implementation and experimental measurement [36, 38]. The simulated results indicate that the interface with smaller ultimate displacement and deformation area shows much better performance, which is in well consistence with the experimental results of a single layer separation process (Figure 2(b)).…”

Section: Discussionmentioning

confidence: 90%

Bioinspired Ultra-Low Adhesive Energy Interface for Continuous 3D Printing: Reducing Curing Induced Adhesion

Dong

et al. 2018

Research

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Additive manufacturing based on liquid resin curing is one of the most promising methods to construct delicate structures. However, precision and speed are limited by the vertical adhesion of in situ cured resin at the curing interface. To overcome the unavoidable adhesion and to develop a general curing interface, we propose a slippery surface taking inspiration of the peristome surface of the pitcher plant. Such surface shows ultra-low adhesive energy at the curing interface due to the inhibition of the direct contact between the cured resin and the solid surface, which also increases the refilling speed of liquid resin. This ultra-low adhesive energy interface is effective for continuous 3D printing and provides insights into the physical mechanisms in reducing vertical solid-solid interfacial adhesion.

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Section: Discussionmentioning

confidence: 90%

Bioinspired Ultra-Low Adhesive Energy Interface for Continuous 3D Printing: Reducing Curing Induced Adhesion

Dong

et al. 2018

Research

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“…According to the physical model and experimental results proposed by Wu et al [9], the success of separation is highly associated with the forces between the pull force (F p ) and the resultant force (F r ) in the z-axis direction, which is shown in Fig. 1.…”

Section: B Spring Assisting Mechanismmentioning

confidence: 99%

Spring Assisting Mechanism for Enhancing the Separation Performance of Digital Light Process 3D Printers

Lin

Yang

2019

IEEE Access

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Separation has been a historic problem in digital light process 3D printing, which limits the capability of printing large areas. Over the years, methods for reducing separation force and improving printing quality have primarily relied on changing separation mechanisms and a constrained surface. Most methods require a pulling-up process; however, a few methods can provide the desired lifting distance by themselves. In our previous work, an in-house design named ''spring-assisted mechanism'' using the combination of spring with a tilting mechanism was proposed to adapt to different required separation forces. The spring compression can be used to provide an additional force for separation, which results in a shorter lifting distance when encountering different print areas. In this paper, we aim to investigate the separation performance by comparing the proposed mechanism with a conventional tilting mechanism. The Taguchi method is applied to study the importance of design features of the spring-assisted mechanism. The results indicate that the maximum separation force occurring in the spring-assisted mechanism declines significantly to 89%. An additional benefit of the proposed mechanism is that the lifting distance required for separation can be adjusted automatically to different print areas, and a sufficient separation force is very low. Consequently, this paper provides experimental evidence that the spring-assisted mechanism can be used for large-scale printing. INDEX TERMS DLP 3D printing, separation force, separation time, spring assisting mechanism, Taguchi method. YU-SHENG LIN received the B.Eng. degree from the Department of Mechanical Engineering, I-Shou University, the M.Sc. degree from the

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“…PµSL 3D printing is a promising high-resolution 3D printing technique in terms of simplicity, accuracy, fast production time, cost-effectiveness, and the variety of materials that it uses. The schematic illustration of the bottom-up configuration 48 PµSL 3D printers and the 3D CAD model of the designed PµSL 3D printer is shown in Fig. 2.…”

Section: Microwell Typementioning

confidence: 99%

A combined 3D printing/CNC micro-milling method to fabricate a large-scale microfluidic device with the small size 3D architectures: an application for tumor spheroid production

Behroodi

Latifi

Bagheri

et al. 2020

Sci Rep

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The fabrication of a large-scale microfluidic mold with 3D microstructures for manufacturing of the conical microwell chip using a combined projection micro-stereolithography (PµSL) 3D printing/CNC micro-milling method for tumor spheroid formation is presented. The PµSL technique is known as the most promising method of manufacturing microfluidic chips due to the possibility of creating complex three-dimensional microstructures with high resolution in the range of several micrometers. The purpose of applying the proposed method is to investigate the influence of microwell depths on the formation of tumor spheroids. In the conventional methods, the construction of three-dimensional microstructures and multi-height chips is difficult, time-consuming, and is performed using a multi-step lithography process. Microwell depth is an essential parameter for microwell design since it directly affects the shear stress of the fluid flow and the diffusion of nutrients, respiratory gases, and growth factors. In this study, a chip was made with microwells of different depth varying from 100 to 500 µm. The mold of the microwell section is printed by the lab-made PµSL printer with 6 and 1 µm lateral and vertical resolutions. Other parts of the mold, such as the main chamber and micro-channels, were manufactured using the CNC micro-milling method. Finally, different parts of the master mold were assembled and used for PDMS casting. The proposed technique drastically simplifies the fabrication and rapid prototyping of large-scale microfluidic devices with high-resolution microstructures by combining 3D printing with the CNC micro-milling method.

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Tilting separation analysis of bottom-up mask projection stereolithography based on cohesive zone model

Abstract: This is a repository copy of Tilting separation analysis of bottom-up mask projection stereolithography based on cohesive zone model.

Cited by 54 publications

References 16 publications

Bioinspired Ultra-Low Adhesive Energy Interface for Continuous 3D Printing: Reducing Curing Induced Adhesion

Bioinspired Ultra-Low Adhesive Energy Interface for Continuous 3D Printing: Reducing Curing Induced Adhesion

Spring Assisting Mechanism for Enhancing the Separation Performance of Digital Light Process 3D Printers

A combined 3D printing/CNC micro-milling method to fabricate a large-scale microfluidic device with the small size 3D architectures: an application for tumor spheroid production

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