A study on The strength of Injection Molded Plastic Helical Gears : 6th Report: The case of an long life test of POM Gears

2004 ◽  
Vol 2004 (0) ◽  
pp. 350-353
Author(s):  
Hiroshi MAEDA ◽  
Tokihiko TAKI
Keyword(s):  
Life Test ◽  
Helical Gears ◽  
Injection Molded ◽  
Long Life ◽  
Injection Molded Plastic

Performance of Injection-Molded Plastic Helical Gears Finished by Hot Rolling

2011 ◽  
Author(s):  
Morimasa Nakamura ◽  
Atsushi Katayama ◽  
Ichiro Moriwaki
Keyword(s):  
Injection Molding ◽  
Hot Rolling ◽  
Load Capacity ◽  
Transmission Error ◽  
Tooth Profile ◽  
Test Rig ◽  
Helical Gears ◽  
Injection Molded ◽  
Injection Molded Plastic ◽  
Plastic Gears

A hot-roll finishing was proposed as a simple finishing method for plastic gears. In the hot-roll finishing, plastic work gears are finished by meshing with a heated copper die wheel. In the previous study, a hot-roll finishing rig for plastic gears was developed, and it was confirmed that tooth profiles of hobbed plastic gears are improved by the finishing. Thus, the hot-roll finishing could also be effective for injection-molded plastic gears. In the present paper, appropriate hot-roll finishing procedures for injection-molded polyoxymethylene (POM) helical gears were pursued. In the injection molding, an inadequate mold easily allows large slope deviations on a tooth profile and trace. The hot-roll finishing can reduce the slope deviations, but induces form deviations especially on the profile. Tests of injection-molded and hot-roll-finished plastic gears were performed on a self-produced gear roller test rig and a self-produced fatigue rig, and a transmission error and load capacity were estimated. Compared with injection-molded gears, hot-roll-finished plastic gears showed small transmission error, while a load capacity was at the almost same level. As a result, the hot-roll finishing is effective for improving a transmission error of injection-molded plastic gears.

Defect Minimization of an Injection Molded Plastic Component Using Conformal Cooling Channels

2021 ◽  
Vol 1019 ◽  
pp. 205-210
Author(s):  
Deepika S. Singraur ◽  
Bhushan T. Patil ◽  
Vasim A. Shaikh
Keyword(s):  
Performance Parameters ◽  
Cooling Process ◽  
Conformal Cooling ◽  
Cooling Channels ◽  
Molded Part ◽  
Cooling Method ◽  
Conformal Cooling Channels ◽  
Differential Shrinkage ◽  
Injection Molded ◽  
Injection Molded Plastic

The cooling process is an essential aspect while designing for uniform heat transfer between the mold and the molded part. Improper design and placement of cooling channels result in non-uniform cooling and thus results in differential shrinkage and warpage on the final product. The installation of the channels yet plays a crucial role in the cooling of the part. Conforming channels that are placed at an optimum distance from the part to enhance the cooling process. In this paper, the performance parameters of straight drilled channels are compared with the conformal cooling channels for an electric alarm box. The analysis indicates that the conformal cooling method improved and enhanced the cooling process and reduced the defects like warpage and differential shrinkage by 25.5% and 28.0% respectively.

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