Simulation of Orientation in Injection Molding of High Aspect Ratio Particle Thermoplastic Composites

2008 ◽  
Author(s):  
Gregorio M. Vélez-García ◽  
Kevin C. Ortman ◽  
Aaron P. R. Eberle ◽  
Peter Wapperom ◽  
Donald G. Baird ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Injection Molding ◽  
High Aspect Ratio ◽  
Thermoplastic Composites

Estimation of Maximum Flow Length for CF-PEEK Overmolded Grid Structures Using the Finite Element Method

2021 ◽  
Author(s):  
Carlos Rodríguez-Mondéjar ◽  
Álvaro Rodríguez-Prieto ◽  
Ana María Camacho
Keyword(s):  
Aspect Ratio ◽  
Injection Molding ◽  
Cross Section ◽  
Maximum Flow ◽  
Thermoplastic Composites ◽  
Injection Molding Process ◽  
Geometrical Parameters ◽  
Molding Process ◽  
Support Tool ◽  
Flow Length

Abstract Injection overmolding process is a high versatile process that permits, when used in combination with fiber reinforced thermoplastic composites, the obtaining of high mechanical properties structures with complex geometries in short time cycles. The maximum flow length is a parameter that reflects the success of filling in a polymer injection molding process. Geometry of the part, rheological properties of the polymer and process parameters, such as injection pressure and temperature, are involved on the value of this parameter and therefore on the viability of a certain configuration. For injection molding manufacturing, the understanding of the relation between maximum flow length and main geometrical parameters of the molded part is fundamental to approach the product design, which is conditioned severely by processing capabilities. In this work, the maximum flow length is obtained for different geometries of an overmolded rectangular stiffener grid of carbon fiber filled polyether eter ketone (CF-PEEK) using the software Moldflow© Adviser© for calculations. Value of maximum flow length is provided as a function of cross section aspect ratio for gate diameters between 0.8 mm and 1.4 mm and cross section areas from 10 to 50 mm2. An exponential decrement of maximum flow length has been observed with the increment of aspect ratio of the cross section as well as a linear increment with the increment of cross section area. Gate diameter variation is slightly related with maximum flow length for the simulated values. These results provide a support tool for geometry sizing in overmolded rectangular grid parts at preliminary design stages.

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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