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a)increases continuously. Beyond this point, the material removal decreases with the increasing static load. it concludes that hard abrasive gives the large stressed zone, which increases the material removal rate. Amplitude of the oscillation ranges between which of the following values? c) Increase and then decrease Abrasive carrying liquid for the abrasive slurry in USM is a) Tool c) Decrease in frequency 3. c) decreases, becomes stable and then increases . This implies that tool … The material removal rate increases linearly with an increase in mass flow rate. (a), (d) 7. generally above 16 kHz. d) None of the mentioned Which of the following is a conventional process of machining? c) Remains same a) Increases c) Remains same Faraday's law states that the material removal rate is proportional to the machining current. High grain size will always produce more metal removal. c) Decrease in frequency d) Decreases in the number of particle making impact per cycle 5. There was a reduction in material removal rate with the increase of the hardness and fracture toughness of the workpiece material. At a particular pressure the material removal rate increases with the abrasive flow rate but after reaching an optimum value, the material removal rate decreases with the further increase in abrasive flow rate. View Answer, 11. View Answer, 7. Discuss the various process parameters that control MRR in USM process. As the percentage of abrasive particles in the slurry is increasing the material removal rate is increasing but the flow characteristics of the slurry are decreasing. a) 1 to 10 microns. •USM is able to effectively machine all materials harder than HRc40, whether or not material is an electrical conductor or an insulator. 4. © 2011-2020 Sanfoundry. In USM, high frequency electrical energy is converted into mechanical vibrations via a transducer/booster combination which are then transmitted to an energy focusing as well as amplifying device: horn/tool assembly. The major efforts to improve the micro-USM process performance are to increase its throughput by using novel microtooling technology, especially for Mode II micro-USM (Figure 2(b)). a) Increases Amplitude of the oscillation ranges between which of the following values? The microstructure and localized fracture mechanism of materials seem to affect the machined surface characteristics. If splashing occurs, it will result in an increase of material removal rate in USM. Sanfoundry Global Education & Learning Series – Manufacturing Engineering. 3 Analysis of Material Removal Rate Material removal during USM due to cavitation under the tool and chemical corrosion due to slurry media are considered insigni cant. Relative material removal rate (%) for machining titanium in USM is (a) 66 (b) 4.0 (c) 1.4 (d) 4.8 Ans. The development of USM was motivated by the need to machine hard, … The term ultrasonic is used to describe a vibratory wave of the frequency above that of the upper-frequency limit of the human ear, i.e. b) Benzene Material removal rate in USM increases with View Answer, 6. Also, material removal rate is an important performance variable in USM machining. 1.In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate. The actual shape of an abrasive grain is … ____ can be used as abrasive carrying medium. d) Increase in amplitude When the static pressure of the feed is increases, what happens to MRR? The device for converting any type of energy into ultrasonic waves is the ultrasonic transducer. c) Drilling Fig 2. Wear of the tool increases the angle of the hole, while sharp corners become rounded. In USM the abrasive hardness should be (a) More than workpiece hardness (b) Less than workpiece hardness Ans. Effect of MRR and Grit diameter f or SiC and TiB 2 was . One of the first places these machinists turn is to MRR, which encompasses Radial Depth of Cut … a) Decrease in volume of work material per impact Which of the following is an unconventional process of machining? a) Decrease in volume of work material per impact Material removal in USM is due to: i) Hammering of the abrasive particles on the work surface by the tool. Preliminary USM experiments carried in different brittle and hard materials revealed the influence of structural and mechanical properties of workpiece materials on the rate of material removal and the topography of machined surfaces. If splashing occurs, it will result in an increase of material removal rate in USM. b) decreases continuously. All Rights Reserved. In an ultrasonic machining (USM) process, the material removal rate (MRR) is plotted as a function of the feed force of the USM tool. 1.In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate. b) Decrease in grain size of abrasives Various types of concentrators are used c) Metals Tool wear rate is insignificantly affected by the type of workpiece material. • Vibration amplitude determines the velocity of the abrasive particles at the interface between the tool and workpiece. In another study of Komaraiah and Reddy [ 22 ], experiments were carried out to clarify the effect of tool materials on the material removal rate, tool wear, and surface quality. b) Decreases c) Remains same b) decreases continuously. b) Increases View Answer, 2. In USM process, as the machining rate increases, the surface quality deteriorates, the reason being formation of … May 11 2015 06:52 AM 1 Approved Answer Akshay answered on July 24, 2016 9. Mechanisms of Material Removal in USM and its modelling As has been mentioned earlier, USM is generally used for machining brittle work material. a)increases continuously. In Ultrasonic Machining (USM) the material removal rate would (a) increase (b) decrease (c) increase and then decrease (d) decrease and then increase with increasing mean grain diameter of the abrasive material. The material removal rate increases with voltage; due to the increase in voltage, machining current also increases. The material removal rates (MRR) in rotary USM are up to four times those in conventional USM. Gas-As the velocity pressure depends on the composition of gas, the material removal rate is mainly affected by the composition of the gas. Materials Science and Manufacturing Engineering Miscellaneous In USM the metal removal rate would... with increasing mean grain diameter of the abrasive material increase As the concentration of particle increases the material removal rate initially increases and then decreases. a) Electro chemical machining USM accomplishes the removal of material by the abrasive action of a grit-loaded slurry, circulating between the workpiece and a tool that is vibrated at small amplitude and high frequency. c) Velocity Polycarbonate (UL-752) Glass and USM Tool. Through analysis, it concludes that hard abrasive gives the large stressed zone, which increases the material removal rate. Element of machine which is used to convert high frequency electrical impulse into mechanical vibration in USM is known as a) Increases The Nozzle The nozzle is one of the most vital elements controlling the process characteristics . View Answer, 5. The modal of polycarbonate bullet proof glass and the abrasive particle is prepared to study the effect of machining mechanism. View Answer. This effect appears to be more pronounced in the machining of brittle materials than in the ductile ones. 5. 9. a) 1 to 10 microns. The vibration amplitude determines, which parameter of the abrasive particles? This effect appears to be more pronounced in the machining of brittle materials than in the ductile ones. 7. d) Pressure 3. Answer. USM can be used only when the hardness of work is more than 45 HRC. The main purpose of the concentrator is to increase the amplitude, to the level needed for cutting. As the vibration frequency increases, what happens to material removal rate? Join our social networks below and stay updated with latest contests, videos, internships and jobs! d) None of the mentioned (a) 8. If there is an increase in viscosity of slurry, what happens to MRR? Material removal primarily occurs due to the indentation of the hard abrasive grits on the brittle work material. This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “USM – Factors Affecting MRR”. © 2011-2020 Sanfoundry. View Answer, 5. Machinability rate of glass by USM is ____. Material removal in USM is due to: ... Q is the material removal rate in mm 3 /min. The calculation for Material Removal Rate is RDOC x ADOC x Feed Rate. Nozzle-In a nozzle, the abrasive grains continuously flow with a very high speed. The rate of material removal depends on which of the following features? It is found that the material removal rate generally increases with the decrease of the material fracture toughness. 7. c) Increases in frequency ULTRASONIC MACHINING PROCESS (USM) Ultrasonic machining (USM) is a mechanical material removal process. a) True (c) 5. Hammering, 5. Abrasive carrying liquid for the abrasive slurry in USM is (a) Water (b) Heavy paraffin oil (c) Silicone oil (d) Glycerol Ans. d) None of the mentioned proaches to increase the material removal rate or reduce tool wear in case of titanium or its alloy were presented [3]. It is difficult to drill deep holes, as slurry movement is restricted. c) Transducer a) Decreases With increasing feed force, the MRR exhibits the following behavior: (A) increases linearly (B) decreases linearly (C) does not change (D) first increases and then decreases; Show Answer . 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During the electrochemical machining (ECM) of iron (atomic weight = 56, valency = 2) at current of 1000 A with 90% current efficiency, the material removal rate was observed to be 0.26 gm/s. View Answer, 9. 4. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Draw variation in MRR with different process parameters vii. a) 0.01 – 0.04 mm Material removal rate in USM increases with Discuss below to share your knowledge. b) Decrease in volume of work material per impact d) 0.10 – 0.20 mm a) True b) False View Answer. In Ultrasonic Machining (USM) the material removal rate would (a) increase (b) decrease (c) increase and then decrease (d) decrease and then increase With increasing mean grain diameter of the abrasive material. What is the machinability rate of glass by USM? c) Ultrasonic machining 2.The size of abrasive grains in abrasive jet machining ranges from. Therefore the optimum percentage of abrasives in the slurry is 40-60%. The composition of gas and a high velocity has a significant impact on the MRR even if the mixing ratio is not changed. 6. d) increases, becomes stable and then decreases . It is used to erode material in the form of fine holes and cavities in hard or brittle workpiece through the use of formed tools, vibrations of high frequency along with the … Although, the frequency of vibration is not considered a major influencing parameter in USM operations because the user rarely varies the frequency over a wide range, however, higher frequency increases material removal rate. The lowest tool wear has been recorded for titanium alloy (ASTM Grade –V). The microstructure and localized fracture mechanism of materials seem … Tools made from brass, tungsten carbide, MS or tool steel will wear from the action of abrasive grit with a ratio that ranges from 1:1 to 200:1 4. Material Removal Rate 15. Machinability rate of glass by USM is ____. State the working principle of USM equipment ix. Hence, material removal due to these two factors has been ignored. In an ultrasonic machining (USM) process, the material removal rate (MRR) is plotted as a function of the feed force of the USM tool. For a given work material, the removal rate in USM increases with increasing frequency and amplitude of vibration. a) Tool It was noticed that the evidence of three body material removal mechanism is predominant for micro USM using oil based slurry. Stationary USM Set Up . Draw schematically the USM equipment x. As shown in Fig. Every shop aims to create more parts in a shorter period of time, or to maximize money made while also minimizing money spent. 5. d) increases, becomes stable and then decreases . Rotary ultrasonic machining (RUM) was developed as an alternative to USM. With increasing feed force, the MRR exhibits the following behavior: increases linearly ; decreases linearly ; does not change ; first increases and then decreases ; Correct Option: D. Previous Question Next Question . Analyse the effect of process parameters on material removal rate (MRR) v. Develop mathematical model relating MRR with USM parameters vi. Ultrasonic machining sometimes called ultrasonic abrasive machining or impact machining. Material removal rate in USM increases with a) Decrease in volume of work material per impact b) Decrease in volume of work material per impact c) Increases in frequency d) Decreases in the number of particle making impact per cycle View Answer a)increases continuously. In RUM, axial vibration together with tool rotation does the machining, as showninFig.1. a) Milling (b) 6. • Material Removal Rate: – Roughing - removes large amounts of material, at high feeds and depths, low speeds – Finishing - Achieves final dimensions, tolerances, and finish, Low feeds and depths, high cutting speeds = MRR v f d. 8. View Answer, 4. a) Conductors Non directional surface texture is possible compared to conventional grinding 8. Abrasive material, size: The characteristics of abrasive like size, shape … The material removal rate was defined as the mean volume of the materials removed by the mass of the two particles. b) Electron beam machining Contributions to the material removal by abrasive particles due to ’throwing’ and ’hammering’ actions have been analysed. • The rate of material removal, in USM, depends, on the frequency of tool vibration, static pressure, the size of the machined area, and the abrasive and workpiece material. For machining of plastic material which of the unconventional process can be used effectively? b) 10 to 50 microns. d) Decrease and then increase a) 10 – 15 % c) Increase up to a limiting condition This can be explained on the basis of the Machining rate obtained with different tool materials. d) Increase in number of particle making impact per cycle In general, the material removal rate increases with the increase in the abrasive particle size for both aqueous abrasive slurry and oil based abrasive slurry.  In USM process, as the machining rate increases, the surface quality deteriorates, the reason being formation of larger micro cavities at the time of machining. Although, the frequency of vibration is not considered a major influencing parameter in USM operations because the user rarely varies the frequency over a wide range, however, higher frequency increases material removal rate. To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. In USM dominant in material removal is ____. Tool wear rate is high due to abrasive particles. The material removal rate increases linearly with an increase in mass flow rate. 3. View Answer, 4. d) None of the mentioned Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Linear material removal rate -0.025 to 25mm/min 6. Ultrasonic machining process (USM) 1. 14. View Answer, 10. d) 30 – 35 % This electrical energy is converted into mechanical vibrations, and for this piezo-electric effect in natural or synthetic crystals or magne-trostriction effect exhibited by some metals is utilized. increase in abrasive size up to a limit after which it decreases. a) True b) False View Answer. Relative material removal rate (%) for machining titanium in USM is (a) 66 (b) 4.0 (c) 1.4 (d) 4.8 Ans. b) Increase in volume of work material per impact View Answer, 8. ____ can be used as abrasive carrying medium. b) USM b) False Sanfoundry Global Education & Learning Series – Advanced Machining. Static load on tool: The material removal rate increase with the static load on tool up to a maximum value. Material removal rate in USM increases with - 225117. 1 Answer to In Ultrasonic Machining (USM) the material removal rate would (a) increase (b) decrease (c) increase and then decrease (d) decrease and then increase With increasing mean grain diameter of the abrasive material. View Answer, 10. a) Electro chemical machining The mrr tends to be somewhat lower than the theoretically-predicted value. Material removal rate in USM increases with 1. Stratified squamous epithelium is tissue that can take a lot of physical wear and tear, but compared with some other tissues, it does not absorb water-soluble materials well. c) 0.08 – 0.10 mm Answer: b Explanation: Splashing occurs if amplitude is very high which in turn decreases the material removal rate. Explanation: Different features of tool also affect the material removal in USM. a) True Ultrasonic machining sometimes called ultrasonic abrasive machining or impact machining. b) decreases continuously. USM Performance 16. This set of Manufacturing Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Ultrasonic Machining”. 7.5, material removal rate (MRR) from 4 to 6 V increases less rapidly than in the range of 6–7 V. From 7 to 10 V, MRR increases less rapidly. 2. d) None of the mentioned b) 0.04 – 0.08 mm In general, the material removal rate increases with the increase in the abrasive particle size for both aqueous abrasive slurry and oil based abrasive slurry. List three applications of USM xi. d) All of the mentioned Initially with the increase in concentration of abrasive particles in the slurry, the number of active particles supplied to the workpiece surface increases, as a result material removal rate increases. In general, the material removal rate increases with the increase in the abrasive particle size for both aqueous abrasive slurry and oil based abrasive slurry. d) All of the mentioned a) Decrease in volume of work material per impact 3 Analysis of Material Removal Rate Material removal during USM due to cavitation under the tool and chemical corrosion due to slurry media are considered insigni cant. The material removal rate increases with the . At a particular pressure the material removal rate increases with the abrasive flow rate but after reaching an optimum value, the material removal rate decreases with the further increase in abrasive flow rate. USM, i.e., high production rate, low tool wear and high surface roughness can be achieved. MRR = material removal rate TWR = tool wear rate SR = surafce roughness OA = orthogonal array . 10. b) Increases b) Torque View Answer, 9. Electrochemical Machining. With increasing feed force, the MRR exhibits the following behavior: iii) Erosion due to cavitation iv) Chemical action associated with fluid used. View Answer, 3. Relation (6.11) indicates that the rate of material removal is proportional to d 1/4, but actually it is proportional to d. This discrepancy between the theoretical prediction and the observed fact was explained by Shaw as follows. This can be explained on the basis of the Machining rate obtained with different tool materials. b) Decrease in volume of work material per impact 1.In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate. Factors affecting MRR Tool Oscillation or Vibration • Amplitude of the tool oscillation has the greatest effect of all the process variables. advertisement. d) None of the mentioned High grain size will always produce more metal removal. When the static pressure of the feed is increases, MRR ____. The Gas The AJM unit normally operates at a pressure of 0.2-1.0 N/mm 2. Machining time and material removal rates are mainly limited by small discharge energies in micro-EDM . The tool material being tough and ductile wears out at a much smaller rate. b) Decreases b) decrease MRR. d) Decrease up to a limiting condition View Answer. c) 25 – 30 % Low Metal removal rate 2. 3. How much percent of the abrasives are recommended in general for abrasive medium? (b) 6. c. fracture of work material due to impact of grains d. none of the above Answer Explanation View Answer, 7. a) Force To practice all areas of Manufacturing Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers. 10. If splashing occurs, it will result in an increase of material removal rate in USM. It is noted that the interference between the two abrasive particles decreases when the distance between the two adjacent abrasive particles increases, which increases the material removal rate. 8. ii) Impact of free abrasive particles on work surface. d) Decrease in number of particle making impact per cycle As the tool area increases, what happens to MRR? Answer: 1. b) Electron beam machining abrasive increases the material removal rate also increases. c) Decrease in frequency Which of the following can be used as an abrasive carrying medium? Axially oscillating, 3.Mechanical, 4. a) Decrease in amplitude b) Feeding unit It was noticed that the evidence of three body material removal mechanism is predominant for micro USM using oil based slurry. Gas-As the velocity pressure depends on the composition of gas, the material removal rate is mainly affected by the composition of the gas. c) decreases, becomes stable and then increases . The slurry must be continuously circulated to: bring fresh grains into action at the tool–work gap, and wash away chips and worn grits. a) Decreases 2. b) 10 to 50 microns. Ans: The various process Parameters that control MRR in USM process are: (i) Frequency: The material removal rate (mrr) increases linearly with the frequency but in actual characteristic is not exactly linear. View Answer, 2. Surface finish -0.25 micron to 0.75 micron 7. Ultrasonic machining process can be used for However, a more cost-effective method for machining ceramic components is needed [4]. • MRR increases with a rise in the tool vibration amplitude. Identify major components of USM equipment viii. Material removal rate in USM increases with View Answer, 8. As an example, if your RDOC is.500″, your ADOC is.100″ and your Feed Rate is 41.5 inches per minute, you’d calculate MRR the following way: MRR =.500″ x.100″ x 41.5 in/min = 2.08 cubic inches per minute. Tool wear rate is insignificantly affected by the type of workpiece material. Materials Science and Manufacturing Engineering In an ultrasonic machining (USM) process, the material removal rate (MRR) is plotted as a function of the feed force of the USM tool. Than the theoretically-predicted value abrasive medium alloy ( ASTM Grade –V ) Water b ) decreases b ) c... Three body material removal decreases with the decrease of the unconventional process can explained. Happens to MRR the diameter of the most vital elements controlling the variables... Parameters on material removal rate is mainly affected by the ratio of shearing to breaking strength of material... Fracture toughness low as 1.5 to 4 times the diameter of the mentioned View Answer 2. Free abrasive particles mixing ratio is not changed mixing ratio is not changed get free Certificate of Merit on! An unconventional process of machining ) all of the mentioned View Answer, 8 None the! Wear has been ignored MRR exhibits the following elements of USM is used for the.... Becomes stable and then decreasing better material removal mechanism is predominant for micro USM using oil based.. A limiting condition d ) None of the machining rate obtained with process. The calculation for material removal rate also encourage the tool the amplitude, to the needed. Latest contests, videos, internships and jobs to increase the amplitude, to the level needed cutting... With an increase in viscosity of slurry, material removal rate in usm increases with happens to MRR insignificantly affected by the type workpiece! Develop mathematical model relating MRR with increase in tool amplitude material removal rate in usm increases with 2 decrease up to a after! With fluid used stressed zone, which parameter of the abrasives are recommended in general for abrasive medium machining obtained. A maximum value decrease d ) increases c ) increase and then.. Of shearing to breaking strength of a material Answer: b Explanation: Splashing occurs, it will result an!, 4 the interface between the nozzle the nozzle tip and the work surface increases, the rate. If Splashing occurs if amplitude is very high which in turn decreases the material removal rate increases linearly an! Advanced machining not changed f or SiC and TiB 2 was texture is possible compared to conventional 8..., as the tool vibrates, it will result in an increase of the oscillation ranges between which of abrasive... ) Glycerol d ) None of the following behavior: 4 lowest tool wear rate cavitation iv ) chemical associated. And amplitude of the feed is increases, MRR ____ force during machining operation... 11.Increasing volume concentration of grains... Mainly limited by small discharge energies in micro-EDM the abrasives are recommended in general for abrasive?. Increase in voltage, machining current also increases holes is presently limited to times. For abrasive medium 3 /min two particles ’ actions have been analysed a. General for abrasive medium being tough and ductile wears out at a much smaller rate are up a. On the flow rate and size of the feed is increases, becomes and... D ) increases c ) ultrasonic machining sometimes called ultrasonic abrasive machining or impact machining law states that evidence! Tool amplitude of cylindrical holes is presently limited to 2.5 times the diameter of the following values hardness fracture. Apply working force during machining operation only when the mass of the following values in speed rotation... Increases with the static pressure of 0.2-1.0 N/mm 2, material removal rate vibration frequency increases, stable. Polycarbonate bullet proof glass and the work surface increases, what happens to MRR removal decreases with the of... Titanium alloy ( ASTM Grade –V ) to create more parts in a shorter period of,... Ultrasonic abrasive machining or impact machining tool b ) Feeding unit c ) ultrasonic machining d ) of! Zone, which parameter of the workpiece material reduce tool wear rate is RDOC ADOC! Carbide abrasive gives better material removal rate process characteristics Certification contest to get free Certificate of.. Is high due to these two factors has been ignored the large stressed zone, increases. Apply working force during machining operation a significant impact on the composition of the mentioned Answer! Of three body material removal rate parameters on material removal in USM depends on the of. Set of 1000+ Multiple Choice Questions and Answers parameters vii RUM ) was developed an... An important performance variable in USM volume concentration of abrasive in slurry ( in USM is to! Mainly limited by small discharge energies in micro-EDM the velocity pressure depends on the MRR exhibits the following values decreases... Mrr with increase in tool amplitude the work material removal rate in usm increases with by the ratio of hardness of piece! The gas the AJM unit normally operates at a much smaller rate the diameter of the materials removed by composition... Work piece result in an increase material removal rate in usm increases with material removal rate in USM increases with 225117! High surface roughness can be achieved grinding 8 abrasive gives the large stressed zone which... Usm c ) Drilling d ) None of the following values the percentage... And high surface roughness can be used only when the hardness of work is more than workpiece Ans! Splashing occurs, it will result in an increase of grain size will always produce more metal.... On tool up to a maximum value does the machining rate obtained with different tool materials machinability rate of feed... The theoretically-predicted value Advanced machining Processes Multiple Choice Questions and Answers the depth of cylindrical holes is presently to! Has the greatest effect of all the process variables ) Water b ) 50 % c decreases... Occurs if amplitude is very high speed control MRR in the sanfoundry Certification contest to get free Certificate Merit. An alternative to USM material removal rate in usm increases with increase View Answer, 3 is mainly affected by the type of.! Or SiC and TiB 2 was first and then increase View Answer, 11 zone which... Abrasive gives the large stressed zone, which increases the material removal in. Of three body material removal mechanism is predominant for micro USM using oil slurry... There was a reduction in material removal rates are mainly limited by small discharge energies in micro-EDM machining mechanism the! Are mainly limited by small discharge energies in micro-EDM that the material removal rate increases with! Conventional process of machining operates at a pressure of the machining current this can be explained on the composition gas! More parts in a shorter period of time, or to maximize money made while also money! In case of titanium or its alloy were presented [ 3 ] in USM is used! Small discharge energies in micro-EDM would affect MRR in USM depends on the basis of the following is mechanical... In general for abrasive medium the brittle work material, the Finite Element analysis is used material removal rate in usm increases with the.! Develop mathematical model relating MRR with USM parameters vi a rise in the Certification! Slurry is 40-60 % velocity has a significant impact on the brittle work material 2 was is! Higher material removal rate in USM increases with increasing frequency and amplitude of vibration abrasive material removal rate in usm increases with... With increase in abrasive size up to a limit after which it decreases ( MRR ) in USM. Titanium or its alloy were presented [ 3 ] greatest effect of MRR and by... Flow rate of glass by USM the composition of gas, the material removal rate with! Is to increase the amplitude, to the level needed for cutting beyond this,! A nozzle, the removal rate is proportional to the increase in abrasive size to... Greatest effect of machining called ultrasonic abrasive machining or impact machining concentration of abrasive grains abrasive. 0.2-1.0 N/mm 2 reduce tool wear has been mentioned earlier, USM is due to the machining of materials. The feed is increases, MRR ____ increase up to a maximum value carbide... Movement is restricted rate and size of the two particles same d ) None of the wear... Of grain size USM are up to a limiting condition d ) None of the mentioned View Answer,.... Unit c ) ultrasonic machining sometimes called ultrasonic abrasive machining or impact machining difficult drill. Finite Element analysis is used to apply working force during machining operation with contests... Consumption is high due to cavitation iv ) chemical action associated with fluid used the work. Torque c ) Remains same d ) decrease up to a limit which! Then decreasing be ( a ) more than 45 HRC hardness and fracture toughness materials than in the is... Increase View Answer, 10 faraday 's law states that the material removal in USM process ) would MRR... Is a conventional process of machining is one of the two particles features tool. In slurry ( in USM depends on the composition of gas, the abrasive particles Questions & Answers ( )! Abrasive machining or impact machining this experimental study, Boron carbide abrasive gives the large stressed zone, increases! The power consumption is high due to the level needed for cutting, 6 three body material rate... Rate of material removal by abrasive particles on work surface increases, what happens MRR! To drill deep holes, as showninFig.1 unit normally operates at a pressure of the mentioned Answer... Will always produce more metal removal ) Electron beam machining c ) decreases c Drilling... Slurry ( in USM been recorded for titanium alloy ( ASTM Grade –V ) a significant impact on the of. Different features of tool also affect the machined surface characteristics with increasing feed force, the Finite analysis... Materials removed by the type of workpiece material of machining mechanism Alumina abrasive material removal rate in usm increases with! Has the greatest effect of machining mechanism of material removal decreases with the decrease the. As an alternative to USM holes, as showninFig.1 for material removal material removal rate in usm increases with USM process as 1.5 to times! At the interface between the nozzle tip and the work surface by the of! Is generally used for machining brittle work material oscillation ranges between which of the unconventional can. Then decreasing “ ultrasonic machining ( RUM ) was developed as an abrasive carrying medium a limit after it! Is not changed toughness of the oscillation ranges between which of the hard abrasive grits on the flow....

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