The evaluation of vacuum venting and variotherm process for improving the replication by injection molding of high aspect ratio micro features for biomedical application

2015 ◽  
Author(s):  
Marco Sorgato ◽  
Giovanni Lucchetta
Keyword(s):  
Aspect Ratio ◽  
Injection Molding ◽  
High Aspect Ratio ◽  
Biomedical Application ◽  
Micro Features

Active Scalable Elastomer Mold to Ease Demolding of High Aspect Ratio Micro Features

2012 ◽  
Vol 591-593 ◽  
pp. 880-883
Author(s):  
Yan Xu ◽  
Kai Leung Yung ◽  
Hang Liu
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Experimental Results ◽  
Metal Mold ◽  
Micro Features ◽  
New System

To fabricate high aspect ratio micro/nano features, demolding is more challenging than filling of melt into micro mold as solidified micro features can be easily peeled off when demolding resistance is high. Besides using anti-stick agent, using deformable mold is a new solution proposed by the authors. This paper presents a setup for testing the deformable active mold. Experimental results on micro thermal molding with the developed mold deforming system prove that the new system can successfully demold high aspect ratio micro features that can not be produced with traditional metal mold.

Micro Electro Discharge Milling of Freeform Micro-Features With High Aspect Ratio

2011 ◽  
Author(s):  
F. Modica ◽  
V. Marrocco ◽  
G. Trotta ◽  
I. Fassi
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Fill Factor ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
High Surface ◽  
Adjustment Factor ◽  
Machining Performance ◽  
Technological Parameters ◽  
Micro Features

Micro Electrical Discharge Machining (μEDM) technology is widely used to process conductive materials, regardless to their hardness and strength, and realize micro-sized feature components for industrial application. μEDM proves to be a very competitive fabrication technology since micro-sized features within 1 μm of accuracy and with high surface quality (<0.1 μm Ra) can be attained. When High Aspect Ratio (HAR) micro-features are machined via μEDM milling, the main problem is to identify the technological parameters and settings mainly affecting the process performance. In the present study the influence of the adjustment factor and flushing conditions are investigated and discussed for the machining of HAR cavities with different Fill Factor (FF). Material Removal Rate (MRR) and Tool Wear Ratio (TWR) are evaluated when deep cavities having variable square sections are machined on Ni-Cr-Mo steel workpiece. All tests are performed using a state of the art micro-EDM milling machine, with a Tungsten Carbide electrode tool and a dielectric oil for flushing. The experimental results presented here highlight different trends in the machining performance in dependence of AR and FF. In particular, MRR exhibits a decreasing trend where the curve slopes are strictly related to the FF and the initial adjustment factor. On the contrary, TWR, for higher FF, displays two distinct trends characterized by opposite slopes in each curve. Finally a nozzle for micro-injection with varying Aspect Ratio and Fill Factor is machined and presented as demonstrator.

Fabrication of High Aspect Ratio Microscale Rod Arrays Using Metal Injection Molding

2013 ◽  
Vol 716 ◽  
pp. 430-433
Author(s):  
Won Sik Lee ◽  
Jin Man Jang ◽  
Berm Ha Cha ◽  
Se Hyun Ko
Keyword(s):  
Aspect Ratio ◽  
Injection Molding ◽  
Grain Growth ◽  
High Aspect Ratio ◽  
Metal Injection Molding ◽  
Aspect Ratios ◽  
Average Size ◽  
Rod Array

In this work, micro rod arrays of 50 um and 200 um in diameter, respectively, were fabricated by 316L metal injection molding. Acryl sacrificial mold was used for the 50 um rod array. Aspect ratios were about 8 and 6 in 50 um and 200 um rod arrays, respectively and the bending of the rods occured due to high aspect ratio in debinding and sintering steps. Also, severe grain growth occurred at rod surface by sintering for 3 hrs at 1300°C and the average size was measured to be about 70 um.

Plastic Injection Molding of High-Aspect Ratio Micro-Rods

2006 ◽  
Vol 21 (8) ◽  
pp. 824-831 ◽  
Author(s):  
Nan Shing Ong ◽  
Honglin Zhang ◽  
Wai Hoong Woo
Keyword(s):  
Aspect Ratio ◽  
Injection Molding ◽  
High Aspect Ratio ◽  
Plastic Injection Molding ◽  
Plastic Injection
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