Adaption of 3D Printing for Rapid Tooling

2021 ◽  
Vol 1016 ◽  
pp. 280-285
Author(s):  
Andrea Böhme ◽  
Detlef Nemak ◽  
Felix Schütze ◽  
Kai Henning Lietzau ◽  
Eckart Wolf ◽  
...  
Keyword(s):  
3D Printing ◽  
Rapid Manufacturing ◽  
Molding Process ◽  
Current Effort ◽  
Prototype Development ◽  
First Results ◽  
Batch Sizes ◽  
Temperature And Pressure ◽  
Molding Tool ◽  
Form Stability

Over the course of the last decade 3D printing has become a more established technology in terms of prototype development (rapid prototyping). The current effort is focused on transferring this knowhow into a product driven approach in order to manufacture even small batch sizes more economic. In terms of this work, this idea is adapted for the development of injection molds (rapid manufacturing). Hereby, a hardened polymer is used to create a forming cavity instead of tool-steel. In order to fulfil the mechanical process requirements of micro injection molding such as form stability under temperature and pressure this cavity is nevertheless integrated into a metal housing. A first set of experiments has been carried out using this develop mold to verify the capabilities of the developed prototype as well as molding process. Based on these first results, an optimization is carried out to improve the next iteration of this molding tool.

scholarly journals 3D printing – a key technology for tailored biomedical cell culture lab ware

2016 ◽  
Vol 2 (1) ◽  
pp. 105-108 ◽  
Author(s):  
Florian Schmieder ◽  
Joachim Ströbel ◽  
Mechthild Rösler ◽  
Stefan Grünzner ◽  
Bernd Hohenstein ◽  
...  
Keyword(s):  
Cell Culture ◽  
3D Printing ◽  
Ex Vivo ◽  
Vascular Perfusion ◽  
Laboratory Equipment ◽  
Key Technology ◽  
Cell Culture Systems ◽  
First Results ◽  
3D Printed

AbstractToday’s 3D printing technologies offer great possibilities for biomedical researchers to create their own specific laboratory equipment. With respect to the generation of ex vivo vascular perfusion systems this will enable new types of products that will embed complex 3D structures possibly coupled with cell loaded scaffolds closely reflecting the in-vivo environment. Moreover this could lead to microfluidic devices that should be available in small numbers of pieces at moderate prices. Here, we will present first results of such 3D printed cell culture systems made from plastics and show their use for scaffold based applications.

Personalized Ring Design and Rapid Manufacturing Based on Reverse Engineering and 3D Printing

2016 ◽  
Vol 851 ◽  
pp. 599-602 ◽  
Author(s):  
Jie Liu ◽  
Guan Ping Dong ◽  
Yan Bin Fan
Keyword(s):  
3D Printing ◽  
Reverse Engineering ◽  
Ct Scan ◽  
Rapid Manufacturing ◽  
Common People ◽  
Engineering Software

Ring as a souvenir and decorations for common people. Due to the design of the market a lot of repetition, people often wish have a unique custom ring , which often have personal logo. This paper Introduces a method of through the fingers to do a CT scan, reverse engineering software and 3 d printing to manufacture custom unique ring for people, This method has high practical value.

scholarly journals Digital light 3D printing of customized bioresorbable airway stents with elastomeric properties

2021 ◽  
Vol 7 (6) ◽  
pp. eabe9499
Author(s):  
Nevena Paunović ◽  
Yinyin Bao ◽  
Fergal Brian Coulter ◽  
Kunal Masania ◽  
Anna Karoline Geks ◽  
...  
Keyword(s):  
3D Printing ◽  
Medical Devices ◽  
Standard Of Care ◽  
Rapid Manufacturing ◽  
Medical Implants ◽  
Psychological Burden ◽  
Life Threatening ◽  
Airway Stents ◽  
Central Airway

Central airway obstruction is a life-threatening disorder causing a high physical and psychological burden to patients. Standard-of-care airway stents are silicone tubes, which provide immediate relief but are prone to migration. Thus, they require additional surgeries to be removed, which may cause tissue damage. Customized bioresorbable airway stents produced by 3D printing would be highly needed in the management of this disorder. However, biocompatible and biodegradable materials for 3D printing of elastic medical implants are still lacking. Here, we report dual-polymer photoinks for digital light 3D printing of customized and bioresorbable airway stents. These stents exhibit tunable elastomeric properties with suitable biodegradability. In vivo study in healthy rabbits confirmed biocompatibility and showed that the stents stayed in place for 7 weeks after which they became radiographically invisible. This work opens promising perspectives for the rapid manufacturing of the customized medical devices for which high precision, elasticity, and degradability are sought.

scholarly journals Animatronic hand using ESP8266

2019 ◽  
Author(s):  
Илья Стародубцев ◽  
Il'ya Starodubcev ◽  
Рустам Самедов ◽  
Rustam Samedov ◽  
Игорь Гайнияров ◽  
...  
Keyword(s):  
3D Printing ◽  
Original Model ◽  
Rapid Manufacturing ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Hand Model ◽  
Real Objects

3D-printing technology puts the question of augmentation in rehabilitation, feedback providing and real objects interaction fields. Rapid manufacturing of prototypes and industrial designs leads to new fields appearance for 3D-printing technology. For example, there are hand prostheses, which are child-oriented, or animatronic models for communication. It is raises the question of managing physical hand in each of these tasks. This work presents the anthropomorphic hand, which is stand mounted. The main focus is on the software solution for gestures simulation. Special gesture format was developed to solve this problem. Prototype was developed by modifying open hand model "InMoov" as a debug realization. The article presents original model part as a circuitry and 3D stand model. The issue of anthropomorphic limb control is universal. The problem is most acute among systems with accurate interaction. Our model covers this problem field.

Compression Molding and Nickel Molds for Directional Gecko-Inspired Adhesives

2021 ◽  
Author(s):  
Capella F Kerst ◽  
Mark R. Cutkosky
Keyword(s):  
Ambient Temperature ◽  
Compression Molding ◽  
Hot Compression ◽  
Molding Process ◽  
Surface Features ◽  
Cycle Times ◽  
The Common ◽  
Temperature And Pressure ◽  
Microscopic Surface ◽  
Adhesive Performance

Abstract In the fabrication of directional gecko-inspired adhesives, a new capability made possible by the availability of metal molds is hot compression molding. This molding process allows the use of elastomers with much higher toughness than those cast at ambient temperature and pressure, as has been the common case in fabricating adhesives. In addition, it permits fast cycle times (minutes instead of hours), which is useful for volume manufacturing. We present the results of hot compression molding of elastomers in metal molds created with overhanging and tapered microscopic surface features, which give rise to anisotropic adhesion. We show that the adhesive performance so obtained is equivalent to that obtained earlier with PDMS.

Study of Mechanical Properties of 3D Printed Material for Non-Pneumatic Tire Spoke

2021 ◽  
Vol 880 ◽  
pp. 97-102
Author(s):  
Ravivat Rugsaj ◽  
Chakrit Suvanjumrat
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Elastic Material ◽  
Molding Process ◽  
Breaking Strain ◽  
Pneumatic Tire ◽  
Wide Range ◽  
Printing Technique ◽  
3D Printed ◽  
3D Printing Technique

The spokes of airless tire or non-pneumatic tire (NPT) are normally made with thermoplastic polyurethane (TPU), which is highly elastic material, to replace inflation pressure in conventional pneumatic tire. However there are limitation in designing of complex spoke geometries due to difficulty in manufacturing process, which normally involve molding process. Recently, the 3D printing technique has been improved and can be used to create highly complex geometries with wide range of materials. However the mechanical properties of printed spoke structure using 3D printing technique are still required to design and development of NPT. This research aim to study the mechanical properties of TPU while varying in printing conditions. The specimens were prepared from actual NPT spoke using waterjet cutting technique and 3D printing technique according to the testing standard ASTM D412 and D638, respectively. The tensile tests were performed on the specimens with corresponding crosshead speed. The testing speed of 3D printed specimen were also varied to 100 and 200 mm/min to study the effects of strain rate on mechanical properties. The stress-strain relationships were obtained from tensile testing and the important mechanical properties were then evaluated. The mechanical properties of specimens prepared from actual NPT spokes and 3D printed specimens were then compared. The ultimate stress of specimens prepared from actual NPT spokes in radial direction and 3D printed specimens with 100% infill were found to be 32.92 and 25.47 MPa, respectively, while the breaking strain were found to be 12.98 and 10.87, respectively. Thus, the information obtained from this research can be used to ensure the possibility in creating NPT spoke using 3D printing technique based on elastic material such as TPU.

scholarly journals The Influence of Air and Liquid Properties on Airblast Atomization

1975 ◽  
Vol 97 (3) ◽  
pp. 316-320 ◽  
Author(s):  
A. A. Rizkalla ◽  
A. H. Lefebvre
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Surface Tension ◽  
High Velocity ◽  
Drop Size ◽  
Thin Sheet ◽  
Dimensionless Equation ◽  
First Results ◽  
Temperature And Pressure

An experimental study of airblast atomization has been conducted using a specially designed atomizer in which the liquid is first spread into a thin sheet and then exposed on both sides to high-velocity air. The first results of this study, reported in reference [1], were confined to the effects of liquid properties, namely, viscosity, surface tension, and density on atomization quality. Since then the experimental data have been extended to include the influence of air properties, notably temperature and pressure, on-mean drop size. The purpose of this paper is to present these data and to show that the effects of both air and liquid properties on atomization quality are described by the following dimensionless equation: SMD/t=A(σeρe/t)0.5(Vaρa)−1.0(1+We/Wa)+B(ηe2/σeρat)0.425(1+We/Wa)2

A Dual Sensing Approach to Simultaneous Temperature and Pressure Measurement From Injection Mold Cavity

2006 ◽  
Author(s):  
Zhaoyan Fan ◽  
Robert X. Gao
Keyword(s):  
Carrier Frequency ◽  
Polymer Melt ◽  
Mold Cavity ◽  
Injection Molding Process ◽  
Temperature Sensitive ◽  
Molding Process ◽  
Melt Temperature ◽  
Temperature And Pressure ◽  
Two Parameters ◽  
Dual Sensing

This paper presents the design and performance analysis of a self-energized wireless sensor capable of simultaneous pressure-temperature dual sensing from within a mold cavity. The sensor extracts energy from the polymer melt pressure differential during the injection molding process and uses ultrasonic pulses as the wireless information transmission carrier. Simultaneous acquisition of melt temperature and pressure and differentiation of the two parameters at the signal receiver's end are made possible by variations of two parameters related to the ultrasonic pulses: the number of ultrasound pulses and the carrier frequency. While the pressure is discretized and translated proportionally into a corresponding number of pulses by a threshold modulator, a temperature-sensitive oscillator module converts the melt temperature variations into a shift of the ultrasound carrier frequency. To quantitatively evaluate the effectiveness of transmission and retrieval of the dual sensing data, an analytical model is established that relates the sensor design to the molding process parameters. The developed technique is validated by the experimental data from a real physical model.

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