Effects of ambient pressure and fluid temperature in ultrasonic cavitation machining

Nagalingam, Arun Prasanth; Yeo, Song Huat

doi:10.1007/s00170-018-2481-0

Cited by 29 publications

(8 citation statements)

References 21 publications

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“…In addition, the internal surface of CCC has high surface roughness [ 76 , 77 , 78 ] and result in reduction in mold life due to stress concentration [ 79 , 80 , 81 , 82 ]. Thus, surface improvement of the CCC by abrasive flow machining [ 83 ], electrochemical polishing [ 84 ], chemical polishing [ 85 ], laser polishing [ 86 ], ultrasonic cavitation abrasive finishing [ 87 ], or abrasive blasting [ 88 ] is also an important research topic. These issues are currently being investigated and the results will be presented in a later study.…”

Section: Resultsmentioning

confidence: 99%

Improving Cooling Performance of Injection Molding Tool with Conformal Cooling Channel by Adding Hybrid Fillers

Kuo

2021

Polymers

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Silicone rubber mold (SRM) is capable of reducing the cost and time in a new product development phase and has many applications for the pilot runs. Unfortunately, the SRM after injection molding has a poor cooling efficiency due to its low thermal conductivity. To improve the cooling efficiency, the thermal conductivity of the SRM was improved by adding fillers into the SRM. An optimal recipe for fabricating a high cooling efficiency low-pressure injection mold with conformal cooling channel fabricated by fused deposition modeling technology was proposed and implemented. This study proposes a recipe combining 52.6 wt.% aluminum powder, 5.3 wt.% graphite powder, and 42.1 wt.% liquid silicon rubber can be used to make SRM with excellent cooling efficiency. The price–performance ratio of this SRM made by the proposed recipe is around 55. The thermal conductivity of the SRM made by the proposed recipe can be increased by up to 77.6% compared with convention SRM. In addition, the actual cooling time of the injection molded product can be shortened up to 69.1% compared with the conventional SRM. The actual cooling time obtained by the experiment is in good agreement with the simulation results with the relative error rate about 20%.

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Section: Resultsmentioning

confidence: 99%

Improving Cooling Performance of Injection Molding Tool with Conformal Cooling Channel by Adding Hybrid Fillers

Kuo

2021

Polymers

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“…Therefore, improving the internal surface of the CCC is also an important research issue. The potential polishing methods [19], including abrasive blasting [20], abrasive ow machining [21], electrochemical polishing [22], chemical polishing [23], laser polishing [24], or ultrasonic cavitation abrasive nishing [25] could be employed to improve the internal surface of the CCC .…”

Section: Resultsmentioning

confidence: 99%

A low-cost and highly efficient method of reducing coolant leakage for direct metal printed injection mold with cooling channels using optimum heat treatment process procedures

Kuo

Qiu

Yang

2021

Int J Adv Manuf Technol

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Metal additive manufacturing (MAM) provides lots of bene ts and potentials in manufacturing molds or dies with sophisticated conformal cooling channels. It is known that the conformal cooling technology provides effective cooling to reduce cycle time for increasing productivity. Ordinarily, mold inserts fabricated by general printing procedures will result in coolant leakage in the injection molding process.The yield in the manufacturing of fully dense injection molding tools was limited to the very narrow working widow. In addition, high costs of fully dense injection mold fabricated by MAM constitute the major obstacle to its application in the mold or die industry. In general, the high cost of MAM is approximately 50-70% more expensive than conventional computer numerical control machining. In this study, a low-cost and highly e cient method of reducing coolant leakage for direct metal printed injection mold with cooling channels was proposed. This new method employs general process parameters to manufacture the green injection mold rapidly and then uses optimum heat treatment (HT) procedures to improve microstructure of the green injection mold. The results of this study revealed that optimum HT procedures can prevent coolant leakage and save manufacturing time of the injection mold fabricated by direct metal laser sintering. The evolution mechanisms of microstructure were investigated experimentally. The save in the injection mold manufacture time about 67% can be obtained.

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“…Otherwise, the cavitation erosion study is complicated phenomena, and it is not fully understood yet, because many other factors influence it, and it works simultaneously. These factors include target material properties, frequency of the ultrasonic horn, the temperature of the test liquid, 67 and machine error (weighing machine).…”

Section: Resultsmentioning

confidence: 99%

“…The explosion creates high-velocity microjets, and that microjets impingement (point impact load) on the material surface causes material damage. 67…”

Section: Resultsmentioning

confidence: 99%

Cavitation erosion behavior of microwave-processed Ni–40Cr₃C₂ composite clads: A parametric investigation using ultrasonic apparatus

Mago

Bansal

Gupta

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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Cavitation erosion is the primary cause of material failure of the hydroelectric power plant components. The rapid development in the advanced surface engineering techniques has provided an effective treatment solution for cavitation erosion. One such novel method is microwave cladding. Hence, the Ni–40Cr3C2 composite clad was deposited on austenitic stainless steel (SS-316) using a microwave cladding process in the present study. The processing was carried out in a domestic microwave oven of 2.45 GHz frequency and 900 W power. The developed clad was thoroughly characterized for the metallurgical and mechanical properties related to its behavior as a successful cavitation erosion resistance material, like microstructure, crystal structure, porosity, microhardness, flexural strength, and fracture toughness. The results showed that the stripe-type and agglomerated carbides were present in the Ni–40Cr3C2 clad. The developed composite clad consists of various carbides (SiC, Ni3C, Cr3Ni2SiC, Cr7C3, and NiC) and intermetallic phases (Ni3Fe, Ni2Si, and Cr3Si). Microhardness, flexural strength, and fracture toughness of the microwave-processed clad were observed to be 605 ± 80 HV0.3, 813.23 ± 16.2 MPa, and 7.44 ± 0.2 MPa√m, respectively. The microwave-processed composite clad performance in terms of cavitation erosion resistance was determined using the ultrasonic apparatus (ASTM-G32-17). The cavitation experiments were carried out according to Taguchi L9 orthogonal array, taking into account three parameters: standoff distance, amplitude, and immersion depth. The developed composite clad exhibited significant resistance (mass loss 7.6 times lesser as compared to SS-316) to cavitation erosion. ANOVA results showed the standoff distance as the most important factor followed by amplitude and immersion depth. Least cavitation resistance was observed at a smaller standoff distance, higher amplitude, and lower immersion depth. Linear regression equations were obtained to establish the correlation between parameters and cumulative mass loss. The microwave clad specimens tested at optimized test parameters were damaged in the form of fractured intermetallic, extruded lips, pits, and craters.

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Effects of ambient pressure and fluid temperature in ultrasonic cavitation machining

Cited by 29 publications

References 21 publications

Improving Cooling Performance of Injection Molding Tool with Conformal Cooling Channel by Adding Hybrid Fillers

Improving Cooling Performance of Injection Molding Tool with Conformal Cooling Channel by Adding Hybrid Fillers

A low-cost and highly efficient method of reducing coolant leakage for direct metal printed injection mold with cooling channels using optimum heat treatment process procedures

Cavitation erosion behavior of microwave-processed Ni–40Cr₃C₂ composite clads: A parametric investigation using ultrasonic apparatus

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Effects of ambient pressure and fluid temperature in ultrasonic cavitation machining

Cited by 29 publications

References 21 publications

Improving Cooling Performance of Injection Molding Tool with Conformal Cooling Channel by Adding Hybrid Fillers

Improving Cooling Performance of Injection Molding Tool with Conformal Cooling Channel by Adding Hybrid Fillers

A low-cost and highly efficient method of reducing coolant leakage for direct metal printed injection mold with cooling channels using optimum heat treatment process procedures

Cavitation erosion behavior of microwave-processed Ni–40Cr3C2 composite clads: A parametric investigation using ultrasonic apparatus

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Product

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Cavitation erosion behavior of microwave-processed Ni–40Cr₃C₂ composite clads: A parametric investigation using ultrasonic apparatus