Conventional rotational molding process and aerodynamic characteristics of an axial-flow hollow blades rotor

Abstract

In this work, the rotational molding process is developed to manufacture in one piece an axial-flow turbomachine rotor with hollow blades. Giving to our knowledge, this process has never been employed in the making of these turbomachine components. Indeed, the blades of these rotors are typically solid blades and are making by injection molding, machining, or thermoforming. The effects of three relevant factors of the rotational molding process are studied here: oven temperature, time of heating, and cooling rate. The cooling of the moving mold is managed by simple convection-of-air, or by convection-of-air charged with water particles. For the oven temperature of 285°C, hollow-blades rotors of good quality are gotten in 12 min per cycle. In addition, aerodynamic characteristics of one rotational molded rotor are compared to those of another part machined in aluminum piece. Characteristics of this aluminum rigid-rotor are assumed as reference.

Rapid Development of an Injection Mold with High Cooling Performance Using Molding Simulation and Rapid Tooling Technology

“…The alternative coolants such as cool air [ 63 ] or oil [ 64 ] can also be used in the experiment for investigating the difference in the cooling performance of an injection mold with optimum CCCs. Lastly, the molds or dies with CCCs fabricated by the proposed method can also be employed in metal injection molding [ 65 ], rotational molding [ 66 ], centrifugal molding, thermoforming [ 67 ], transfer molding [ 68 ], hot stamping [ 69 ], plastic injection molding [ 70 , 71 ], microinjection molding [ 72 , 73 ], or blow molding [ 74 ]. These issues are currently being investigated and the results will be presented in a later study.…”

Experimental study of PLA thermal behavior during fused filament fabrication

“…By taking advantage of this size, it is possible to squeeze the device between two adjacent filaments. The thermocouple is connected to a Datapaq® Tracker Telemetry system (previously employed for the in situ temperature measurement in rotational molding process 29 ) for temperature recording and connection to a polycarbonate (PC). As shown in Figure 2 (setup of the work), when the print was started by fabrication of the support (by opening the door) thermocouple placed at the location of 5 mm from the starting point of the deposition and then the door closed in order to have a stabilized temperature of the environment.…”

Influence of process parameters on thermal and mechanical properties of polylactic acid fabricated by fused filament fabrication

“…A thermocouple type K with a diameter of 80 μm, capable of measuring temperature from −75 C to 250 C was used. [32] To measure the temperature evolutions, a measurement device "Datapaq Tracker Telemetry system" was used (an in situ measurement device using in rotational molding process [33] ). The influence of liquefier temperature has been studied.…”