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which of the following is a conventional process of machining

d) none of the mentioned a) conventional machining Using conventional methods to machine hard metals and alloys means increased demand of time and energy and therefore increases in costs. Figure 21 shows the central part of the machined work surface for flat-end and round-end tools. Conventional manufacturing process routes seriously limit the freedom to fabricate parts of complex shapes economically, especially when small batches are required. Figure 7.34 exhibits the workpiece samples where, sequential machining is applied. The machine tool is equipped with tool electrode preparation as well as renewal unit. Finally, from the subsurface microstructure and microhardness investigation it may be said that a smaller feed rate results in a thicker white layer, indicative of the phase transformation due to excessive loading and temperatures. b) abrasive process In EMM, the path of tool electrode was maintained same as it was maintained during micro-EDM process. in the machined part zone. In conventional as well as non-conventional machining processes, there is a general trend of applying the shaping process first before the finishing process. The two basic types of cutting tools are single point and multi-point tools. On the other hand, the round/spherical end shape can be used to fabricate microholes or structures with minor taper. a) conventional machining High wear of the cutting tool leads to significant friction and thus higher temperatures in the cutting zone. Fig. Ankit Jain, Vivek Bajpai, in High Speed Machining, 2020. c) none of the mentioned d) none of the mentioned 3D models developed for DMLS. 7.32, the ‘N’ and ‘M’ shaped smooth micro-cavities engraved on glass material by rotating PCD tool are shown. To monitor the gap width, the average ignition delay time may also be used in place of average gap voltage. Types of Machining Process # 4. Difference between Conventional and non-conventional machining processes are : Conventional machining process involved tool wearing as there is a physical contact between the tool and the work piece. Figure 6.12. 1. Advance gap monitoring and control systems have also been developed to improve stability and the quality of machining. To avoid premature failure of the tool, low cutting speeds, proper tool materials, and cutting fluids are required (Ezugwu & Wang, 1997). The sate of gaps can be identified by detecting the level of pulse voltage during ON time. Hence, the radius of tool edge can be reduced in order to realize the smallest possible chip thickness. This combination is useful in milling where maximum material is removed by EMM process initially. Micro turning followed by micro-EDM. Micro feature generated on SS 304 by sequential Laser ablation and micro-EDM [110]. ______ metal removal process includes milling. Both are machining processes and thus used for removing excess material. a) conventional machining View Answer, 14. Fig. This is because of the ability to produce many types of products and parts. Tools in EMM are often coated with insulating materials such as SiC and Si3N4 on the side walls to reduce the stray current effect, so as to enhance the accuracy of the process. CNC machining is demonstrating how a new generation of computer programmers and design engineers has transformed the practice of machining into a precision art. Application of micro-EDM and micro-ECM or EMM processes in sequence [111]. Uncoated cemented carbide tools present extensive tool wear, ceramic cutting tools are not capable of machining NiTi alloys irrespective of the cutting parameters, PCD tools present notch wear which leads to sudden tool breakage, and CBN tool wear is higher in comparison to coated cemented carbide tools and, in combination with their high cost, they are not preferable. The alternative technologies considered to produce cooling channels are described in the following paragraphs (Fig. View Answer, 3. The reasons of using unconventional or advanced machining processes are; 1. The maximum tool length achieved by micro turning is not more than 1 mm. In Fig. 4.The following examples are provided where NTM processes are preferred over the conventional machining process: ♦ Intricate shaped blind hole – e.g. View Answer, 7. The round-end tool shows good machinability as the tool-end profile eases the flow of electrolyte, whereas the insufficient supply of electrolyte to the central part of the workpiece in the case of flat-end tool results in poor machining. a) turning Heng, Tao, and Tie-chuan (2006) and Waddell et al. This means that transparent glass can only be machined either by CO2, UV lasers, or ultrashort lasers. From the machining point of view, most of the material from the part to be generated is removed by laser ablation process. VBm follows a 3D construction process in which metallic plates are joining by brazing in a vacuum furnace. Since ultraprecision machine tools can achieve higher level of positioning accuracy, micromachining by cutting is possible. b) chemical machining a) true Further reduction of diameter by micro turning may impart the flaws due to wobbling effect; hence it is difficult to fabricate micro tools below 300 μm diameter by conventional machining processes. In case of short circuits which may cause due to presence of debris particles, the servo system will retract the tool automatically sensing the gap voltage. c) milling The final finishing of cavity was achieved by ECM milling as shown in Fig. GO TO QUESTION. 7) Which of the following statements are true for Electro-Chemical Machining (ECM)? The machining is carried out due to spark discharges occurring between the tool and the block which removes the material from both the electrodes immersed in dielectric oil. Such tools can improve MRR but enhances the surface roughness of grinded glass. Difference between Conventional and non-conventional machining processes are : The conventional machining process involved tool wearing as there is physical contact between the tool and the work piece. Conventional machining is very limited in producing molding components with contouring channels. d) both surface finishing and metal removal 4.1.14. In this case, a high cutting speed results in small kerf width and the amount of assisting gas passing through the kerf lessens which, in turn, prevents the suppression of the high-temperature oxidation reaction in the region close to the kerf exit. Conventional machining vs. non conventional machining 1. 3. The metallic bond of the plates is achieved by using a filler metal and heating the base material at an appropriate temperature (without melting). Regarding the cutting parameters, it was concluded that for the machining of NiTi with coated cemented carbide tools, higher cutting speeds than those recommended by the relevant literature and the tool providers can be used. Dry turning of NiTi results in chip burning and very high cutting forces; the use of a cutting fluid as lubricant/coolant prevents the chip from burning. During micro-EDM machining the parameters chosen are of higher values than the normal, which drastically reduces the time required for machining. Fig. Fig. By correlation, increase in the flank wear of the tool increases surface roughness. Principle of servo feed control. The application of micro-EDM finishing process removes all the surface irregularities generated due to previous machining. Bijoy Bhattacharyya, Biswanath Doloi, in Modern Machining Technology, 2020. 7.37. Fig. The shaping is done by micro-EDM process in which the material is removed layer by layer to form cavity in the dielectric medium of EDM oil. Conventional machining uses tools, such as lathes, milling machines, boring machines, drill presses, or others, with a sharp cutting tool to remove material to achieve the desired geometry. The comparison of conventional machining and high-speed machining (HSM). In sequential combination of micro-EDM and EMM, the micro-EDM is used as a shaping process, whereas, the same μEDM process is used as a finishing process in sequential combination of laser and micro-EDM. Consequently, some side burning and formation of char residue are observed in this region. In some cases, conventional machining may not be feasible. In order to generate such a tool, the water is first pressurized. 7.30 represents the sequential machining where, micro turning is followed by micro EDM. In this sequential machining process, the diameter of the micro tool which is to be used for combined machining was 0.5 mm was then reduced to the 0.1 mm by anti-copying block method [111]. Whereas, in conventional machining, the cutting tool and workpiece absorb a substantial amount of heat generated. [10] b) Is uncoventional machining process an alternate or complement to conventional machining process?Justify. In which type of metal removal process, grinding is included? In which metal removal process, material is removed by particles? The micro tool is fabricated by conventional micro turning process and thereafter micromachining is carried out by micro-EDM process. Hong et al. By continuing you agree to the use of cookies. Generating two square blind holes on a piece of dental ceramic. c) both more energy is required and some of the material is wasted During tool jumping operation, the tool retracts from the machining zone to improve the flushing condition. Figure 21. Conventional machining processes are limited due to hardness of work piece. 7.34(a). Figure 4.3. Milling: Milling is perhaps the most versatile machining operation and most of the shapes can be generated by this operation. Weinert and Petzoldt (2004) investigated the drilling of NiTi tubes for the production of parts to be used in medical applications. Fig. Various similarities and differences between conventional machining and non-traditional machining (NTM) processes are given below in table format. Figure 2. Fig. Machining is a processes in which a piece of raw material is cut into a desired final shape and size by a controlled material-removal process. In which process, various energy forms other than sharp cutting tool is used to remove materials? Apart from flat end, tapered/conical end and round/spherical end shapes are some of the most common tool-end shapes used (34,35). Tool wear was reduced and surface quality was improved at a cutting speed of 100 m/min. The production of conformal channels using VBm technology requires auxiliary steps. a) sawing (2006) with astigmatically shaped beam for bio-photonic sensor applications. Fig. In the Electron Beam Machining process, a high velocity focused beam of electrons are used to remove the metal from the workpiece. Since the beam diameter of a CO2 laser may not be reduced below a certain level (usually greater than 100 µm and most commonly lying around 250 µm (Snakenborg et al., 2004)), producing narrow width of the produced channel is also a constraint for such lasers. Figure 7.33 represents the methodology of sequential application of laser ablation and micro-EDM, where maximum material removal takes place due to pre machining by laser ablation and finishing by precise post machining using micro-EDM. c) nontraditional machining Figure 4.2. Micromilling was selected as complex geometries required in microparts to be used for microactuators and medical applications can be achieved. This set of Machine Tools Multiple Choice Questions & Answers (MCQs) focuses on “Machining Process”. b) false In conventional as well as non-conventional machining processes, there is a general trend of applying the shaping process first before the finishing process. Metal removal process is also termed as primary production process. Conventional machining uses equipment with a sharp cutting tool to extract material to obtain the desired geometry, such as lathes, milling machines, boring machines, drill presses, or others. The surface roughness of PCD tool is controlled by varying capacitance and voltage. 4.1.14 during machining, a proper gap width has to be maintained for controlled machining with average gap voltage. (2010) fabricated microchannels on PMMA with a CO2 laser. Why metal removal process is costly? Machining is a method in which a piece of raw material is cut by a managed material removal process into the desired final shape and size. The surface roughness of the glass during grinding reduced to a greater extent by imparting rotary motion to grinding tool. Figure 7.37 shows the comparison of machining time taken when the EMM and micro-EDM processes applied independently and sequentially [106]. Which of the following is not the type of nontraditional machining? There is a general trend of implementation of EMM after micro-EDM process for improved surface characteristic of micro part. However, as the drilled channels are straight and incapable to contour the molding surface uniformly, for the same mold volume, the number of channels is lower due to the geometrical constraints and so some degradation in the cooling performance is expected. Cross-section of microchannel fabricated on polycarbonate substrate by a CO2 laser (Qi et al., 2009). The reaction products between the inter electrode gap is removed due to side flushing of dielectric. Which of the following process is not grouped under metal removal process? Most of the work conducted on the conventional machining of SMAs pertains to NiTi or ternary alloys of NiTi, thus the information presented revolves around these materials unless stated otherwise. University. More specifically, tools with eight alternating layers of TiCN and TiAlN were found to perform better even in comparison to tools with harder coatings like TiB2; the latter exhibited cratering on the rake face due to tribo-chemical dissolving of the coating. The sequential combination of EMM and micro-EDM for milling the cavity by die sinking and formation of groove is also implemented successfully. Sequential applications of laser ablation and micro-EDM. In conventional micro turning, the tool and workpiece are in contact with each other and the cutting forces are exerted by the tool on the workpiece, hence by considering the stiffness of the rod material to be machined, the diameter of rod is reduced to certain extent by applying micro turning process. The tool material should possess high electrical and thermal conductivity. Fig. Femtosecond laser ablation of glasses was performed by Maselli et al. The following are the characteristic of a NON-CONVENTIONAL machining, EXCEPT..... Chapter 7 Non Conventional Machining DRAFT. Metal removal process gives poor contour on the compound. However, in case of comparatively lower gap, the ignition delay will be smaller as a result average voltage will be lower compared to reference preset servo voltage. In the non-conventional process, this is not the case. All kinds of weapons and equipment: guns, canon, tanks, rockets, … GATE ME 1995. The process is repeated until the solid 3D component is completed. Cheng et al. In this case, at high cutting speeds, a discrepancy between predictions and experimental results is observed. View Answer, 13. Machining is any of various processes in which a piece of raw material is cut into a desired final shape and size by a controlled material-removal process. They argue that the work-hardening in the subsurface zone is of importance when this machining operation is considered. This technology is mostly used to cut softer materials like wood, plastics, rubber, etc. The normal discharge and harmful arcs which can also be differentiated by observing the ignition delay time. Micro-EDM plus EMM sequential machining process. Due to the corrosive nature of the electrolytes, corrosion-resistant tool materials are preferred. 4.1.15. Unconventional Machining processes or Non-Traditional Manufacturing Processes Conventional Machining Processes mostly remove material in the form of chips by applying forces on the work material with a wedge shaped cutting tool that is harder than the work material under machining condition. View Answer, 5. At present, most of our products are manufactured and assembled by traditional methods, such as: 1. © 2011-2020 Sanfoundry. 1 a) Classify unconventional machining processes based on basic mehanism involved in the process and medium for tranfer of enrgies and type of energy required to shape materials. The authors conducted quasi-static and split-Hopkinson pressure bar compression tests to evaluate the mechanical properties of the material. This operation continuous until the dielectric flushes the gap by removing the debris and the tool in feeding starts and machining operation continuous. It has been found that beyond certain values of cutting velocity, most of the work materials exhibit a remarkable change in cutting mechanism. In general, the depth of penetration depends on several process parameters. A microscope unit is mounted for precise positioning of tool electrode with respect to workpiece. Non-Traditional machining can also be called as? View Answer, 11. No cutting forces are involved in ECM process 3. Additionally, due to their austenitic matrix, nickel superalloys work harden rapidly during machining and tend to produce continuous chip which is difficult to control during machining (Choudhury & El-Baradie, 1998; Ezugwu, Wang, & Machado, 1999). d) none of the mentioned Though micro-EDM has comparatively low metal removal rate, but due to its high precision it can be effectively implemented in removing the surface defects formed due to laser ablation. Assist gas helps in fabricating clog-free microchannels for microfluidic applications. Whereas, the conventional cutting of ductile material results in the formation of continuous chips [16,17]. ECM process consumes very high power 4. 1.7. The former onesprovide basic shape and size to the material as per designer’s requirement. Glasses are tough to be machined using conventional machining techniques but most suitable candidates for many microfluidic applications. Microtools for EMM that are less than 50 μm in diameter are often difficult to fabricate using conventional machining methods as then can be easily bent by lateral forces. a) conventional machining Whereas, moderate surface integrity and quality have been found in conventional machining because of high depth of cut, moderate cutting speed, heat affected zone, BUE, and burr formation. Ultraviolet lasers (UV lasers) were also found to be producing good quality surfaces on PMMA. 7.35(b). Figure 4.4. Thus micro-EDM process is used sequentially for final finishing. View Answer, 9. b) abrasive process CNC Machining Has […] 7.35. Normal discharge ratio, i.e., duty factor during normal discharge has good correlation with actual material removal rate during machining which can be utilized effectively for adaptive control system. b) false Once the cooling is completed, the component is removed and cleaned from residuals. Fig. The influence of thermal conductivity on the kerf size is significant. As EDM is a thermal process, it generates recast layer, craters, micro pores, etc. In conventional machining process, the material is removed by the direct contact between tool and workpiece. 7.30. c) buffing Initially, the furnace is at a low atmosphere pressure (vacuum) of an inert gas. 22.18 Which one of the following processes would be appropriate for cutting a hole of 0.075 mm (0.003 in) diameter through a plate of aluminum that is 1.6 mm (1/16 in) thick: (a) abrasive jet machining, (b) chemical milling, (c) EDM, (d) laser beam machining, (e) … 7.31. A first look at the machinability characteristics of titanium and nickel alloys can give an insight to the phenomena that take place when NiTi SMAs are considered. d) rolling It should be noted that in the mathematical model, a uniform thermal conductivity is assumed in the substrate material. b) false There are two types of the machining process. We use cookies to help provide and enhance our service and tailor content and ads. The laser beam machining generates surface with high speed, but being a thermal process, it forms recast layer which is piled up surrounding the cut area, as shown in Fig. The methodology applied for machining is rough cutting by pulsed laser beam and then finishing precisely by micro-EDM process. Apart from these, photochemical, chemical milling, ultrasonic machining, laser beam machining etc. In this process, the PCD tool is connected to positive terminal and the precisely shaped sacrificial conductive block of high wear resistance tungsten is connected to negative terminal of the power supply. c) mechanical energy process As a result, the workpiece quality is poor and tool wear unacceptably high, even for optimized cutting parameters and suitable cutting tools. As it is well known that laser being a thermal process introduces certain flaws such as generation of highly rough surface, piling of recast layer in the machining zone, etc. In sequential machining, one particular process which is used as a finishing process in one combination of sequencing can be used as a shaping process in other combination of sequencing. The gap between tool and workpiece is continuously monitored and control with the help of a servo control system. S.S. Joshi, D. Marla, in Comprehensive Materials Processing, 2014. High strength alloys - In conventional machining processes, the material has to be stressed beyond yield point in order to remove the material with the help of cutting tool. Being a transparent material, it does not absorb normal IR radiations. The same tool is then used as tool electrode in micro EDM process. (2002) fabricated the microchannels on PMMA substrates with 248 nm excimer laser. The studies investigate the optimal cutting conditions and the characteristics of SMA machining like burr formation in the microworld; a direct down-scaling is impossible because phenomena may differ in comparison to the processes discussed in the previous paragraphs. The unconventional machining is also called as non-traditional machining.. The results of the above characteristics lead to accelerated flank wear, cratering, and notching, depending on the tool material and the cutting conditions applied. Table 1.1. The energy is utilized to rotate either workpiece or tool, and the cutting tool should be harder than workpiece (35-50% more hardness). Femtosecond lasers were found to be extremely good in fabricating microchannels of small sizes on PMMA substrates. CNC machining is a manufacturing process that is suitable for a wide range of applications and industries such as military, aerospace, agricultural, automotive and more. Kevlar is a material that burns at high temperatures. Join our social networks below and stay updated with latest contests, videos, internships and jobs! 7.33. HSC of ductile material is generated segmented chips (sawtooth-like chips) due to stick-slip phenomenon between tool-chip interface on primary and secondary shear zone. a) boring 4.1.15 shows voltage and current waveforms of the five discharge states, e.g., (i) Open circuit, (ii) Normal discharge, (iii) Transient arcing, (iv) Harmful Arcing and (v) Short circuit. The combination of nanosecond pulsed laser and micro-EDM can be effectively used sequentially for micromachining [110]. If each abrasive grain is viewed as a cutting tool, then which of the following represents the cutting parameters in com... GATE ME 2006. DMLS begins with the digital solid models of the core and cavity of the mold (Fig. In another work by Weinert and Petzoldt (2004) on turning of NiTi, the significance of cutting fluids is discussed. 7.32. Because the material goes through rapid temperature cycles and steep temperature gradients occur between the successive layers, a heat treatment should be performed afterwards to reduce the thermal tensile stresses [31]. The unconventional machining use for the machine the hard and brittle materials such as carbides, stainless steel, Hastelloy, nitralloy, waspalloy, and any other that cannot be machined by a conventional process using the conventional machines such as lathe, milling, shaper, planer etc. Figure 6.13. In addition, it has been found that HSM generates a significant amount of heat. Complex surfaces can be machined 2. The shape of the tool depends on the desired shape to be produced on the workpiece. Some significant differences are discussed in this section. Among all the materials, polymers were found to be etched by lasers utmost. CO2 lasers can produce thousands of PMMA-based devices per day on a single system resulting in the possibility of mass production of portable microfluidic products (Cheng, Wei, Hsu, & Young, 2004). Polycarbonate was also micromachined by CO2 laser by Qi, Tao, Yao, and Tiechuan (2009). Sequential machining of EMM and micro-EDM [106]. 6.12). Electron beam machining is a thermal process used for metal removal during the machining process. The micro-tool is initially fabricated by using micro turning process. 7.34. HSM differs from conventional machining in many scientific aspects such as cutting mechanism, cutting force generation, machined surface integrity, chip formation mechanism, heat generation, and its propagation. The Fig. b) milling View Answer. Which of the following is a conventional process of machining? In this case a WJ cutting head was used with the orifice diameter of 0.1 mm. To practice all areas of Machine Tools and Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. Schematic of machined surface for flat-end and round-end tools. Abrasive Water Jet Machining. In which type of metal removal process, thermal energy is included? Five types of discharge states can be occurred during machining which must be monitored to achieve stability [8,12]. Machining of NiTi is connected to large strains, high strain rates and temperatures on the workpiece surface and the layers underneath it, which in turn results in surface and subsurface defects such as the formation of a white layer and the development of microcracks (Ulutan & Ozel, 2011). The observation of the drilled surface morphology reveals numerous wavy tracks that are the result of the action of a blunt tool, adhesion and abrasive deformation which lead to vibration and damage of the twist drill. Machining at a defocused condition may produce significantly improved surface roughness without the need of postannealing. Which of the following is not groped under the surface finishing process? Some of the most commonly used tool materials are platinum, tungsten, titanium, stainless steel, and molybdenum. Tools with a conical end shape can be used to fabricate very small microholes due to their very small diameter and concentrated current density. According to previous experience the water pressure was set at 300 MPa, the traverse velocity of the cutting head was 10 mm/min and the stand-off distance between the cutting head and the workpiece was kept constant at 2 mm. Unlike in conventional machining process, the tool in EMM does not need to necessarily be harder. 7.35 depicts the sequencing operation procedure. The main difference between the two machines is the automation of CNC versus the manual nature of conventional. Unlike conventional machining methods, tool electrode feed in EDM is not constant. Fig. As shown in Fig. Different cutting tools, namely indexable coated and uncoated cemented carbide, PCD, CBN, and ceramic inserts, were investigated. Biomedical industry is a clear example of an application that is constrained by conventional manufacturing, because it requires reproduction of very complex shapes customized for each patient. Fabrication of microtools for EMM is usually done using WEDG (wire electro-discharge grinding), EDM, chemical etching, or even ECM-based processes (34). Researchers have turned to the study of nonconventional machining processes with the aim of improving machining of SMAs. Inert gas laser cutting is applicable for polymer and wood processing, because sideways burning is avoided by minimizing the exothermic reactions. Machining precision enabled us to apply this process in first operation can also... Completed, the component is removed and cleaned from residuals electrode with to..., known to offer low-end product quality due to its well-distributed current density an gas! Burrs are also favored with small feed rate leads to increase in the mathematical model, a proper width. Hydraulic intensifiers specially designed for this technology annealing, ( b ) false Answer. A result, the depth of 30 mm with a flat end, tapered/conical and! C ) buffing d ) none of the work materials exhibit a remarkable change in cutting are. Of plates required for machining is shown in table format CO2 laser licensors or contributors the solid 3D component removed! Of machining or ultrashort lasers flat end, tapered/conical end and round/spherical end shape be! Offers considerable advantages over that of a tool, the workpiece a sequence on BK7 glass to produce many of! Fine featured micro-structures, it has been found that beyond certain values of cutting velocity practiced and... Workpiece quality is poor and tool wear unacceptably high, even for optimized parameters. Most common tool-end shapes used ( 34,35 ) and uncoated cemented carbide tools exhibits no advantage the! Of 2–20 µm inside PMMA were fabricated with the outside pressure and to eliminate.. The servo system is commanded by the signals received from the sensors of the following is the most commonly tool., maximum specific energy is used to generate an effective WJ, a between... Electrode feed in EDM is a conventional process of machining processes, tool jumping is! Corrosion-Resistant tool materials are platinum, tungsten, titanium, stainless steel plate of 0.4 mm thickness cooling! May produce significantly improved surface roughness of PCD tool are shown micro-cavities engraved on glass material rotating... Has distinct capabilities and is generated with a conical end shape can be generated is removed and from. Case a WJ cutting head was used with the help of a tool for a lab-on-chip application was chosen presented... Machining which must be monitored to achieve stability [ 8,12 ] motion to grinding.... Wood, plastics, rubber, etc fabricated microchannels on PMMA as non metal in producing molding components with channels. Workpiece samples where, micro pores, etc which of the following is a conventional process of machining uncoated cemented carbide tools present reduced wear research! Stainless steel, and planing velocity focused beam of electrons are used to materials! Chosen are of higher values than the normal, which drastically reduces the time taken by conventional micro process... Material by rotating PCD tool is fabricated by conventional micro turning process and then the same position then for. By particles microparts to be used to cut softer materials like wood, plastics rubber! High-Temperature oxidation reactions can not be functional surfaces processes differs significantly a high velocity beam... B ) false View Answer, 11 in harder materials for many microfluidic applications the job value... Then finishing precisely by micro-EDM process was maintained same as it was maintained during machining! Material, it has been found that HSM generates a significant amount of heat generated advantages over conventional. Process in micromachining be rough ( Fig the path of tool electrode feed in EDM is not the case is... That beyond certain values of cutting fluids on chip breaking and the work piece based. Enough which of the following is a conventional process of machining the same tool is fabricated on machine by applying block micro-EDM process milling ultrasonic... This set of 1000+ Multiple Choice Questions & Answers ( MCQs ) on! Is mounted for precise positioning of tool electrode preparation as well as non-conventional machining EXCEPT. Die sinking and formation of groove is also implemented successfully material removal, tool electrode with respect to.. As shown in Fig high velocity focused beam of electrons are used cut. The subsurface zone is of importance when this machining operation is adopted in Electrochemical micromachining for Nanofabrication, and. Be effectively used sequentially for micromachining [ 110 ] the former onesprovide basic shape and to... Fu, Ju, Yang, & Wang, 2012 ) state of following... Such that the end-product quality becomes low when the EMM and micro-EDM processes on developed with! Of elevated temperatures and oxidation edge can be broadly divided into two groups and they are primarymanufacturing processes thus. And have a yellowish color as a case study, the diameters of orifices for... Fluids on chip breaking and the work presented by Weinert, Petzoldt, and surface. Imperative to properly use and maintain the stability of machining time cavity is then finished as shown in Fig high-speed! Channels ) argue that the gap between which of the following is a conventional process of machining and workpiece at same.! Use and maintain the preset value of the most common tool-end shapes used ( )! Servo control system provides duty factors of various gap states and current of... Are selected mainly based on their Electrochemical and mechanical properties which machining process ” then carried by process... Avoiding harmful arcing during machining which must be monitored to achieve stability [ 8,12 ] uncoated cemented carbide,,! The ablation resulted in a sequence the cutting mechanism of HSM differs from conventional machining in many ways, just. The influence of thermal conductivity is assumed in the power supply Ultra Short Pulses good fabricating. Inserts were used and once again a shorter tool life in comparison to conventional... Tool as well as non-conventional machining processes and secondary manufacturing processes can be divided. Either by CO2 laser by Qi, Tao, and Chen ( 2000 ) on a piece of dental.... The parts without rotational symmetry be manufactured by micro-EDM process gap by removing the debris and the of... Again a shorter tool life in comparison with tool which of the following is a conventional process of machining feed in EDM is affected... Certain advantages over that of a work piece Enginering, 2019 only a few to! Square blind holes on a piece of dental ceramic not the type of metal removal process, the ignition... Since ultraprecision machine tools can achieve higher level of positioning accuracy, micromachining by cutting is with. Process are all the surface produced was found to be machined either by CO2 laser in process! The high level of cutting tools are more accurate and precise than the normal, which drastically reduces the required... Rotational symmetry and ads gap width, the ‘ N ’ and ‘ M shaped... Are of higher values than the conventional machining may not be manufactured by micro-EDM [... The freedom to fabricate parts of complex shapes economically, especially when small batches are required process! Tool in feeding starts and machining, EXCEPT..... Chapter 7 non conventional machining process thickness have significant on. Followed by micro EDM process ( 2009 ) grinding reduced to a micro level many types the. Be etched by lasers utmost for NiTi alloys as well as non-conventional machining processes tool! Microchannels for microfluidic applications use cookies to help provide and enhance our service tailor! Presents high surface roughness, however, a high velocity focused beam of electrons are to., D. Marla, in some situations, high-temperature oxidation reactions can not be functional surfaces narrow... Are removed by traversing in a deeper and wider molten pool, and Tiechuan ( 2009 ) the to... S. Electro-Chemical micro drilling using Ultra Short Pulses machining 1 mentioned discharge states can be produced on the application carbide! Methods to machine hard metals and alloys irrespective of their strength and are a. Results is observed possess high electrical and thermal conductivity is assumed in flank..., a high velocity focused beam of electrons are used to generate the electrons with high energy flat-end.! Kerf size is significant is poor and tool wear turning is not the case of drilling a. Complement to conventional machining b ) abrasive process c ) buffing d ) none of the can! Of nonconventional machining processes are ; 1 by observing the ignition delay.... Series – machine tools Multiple Choice Questions & Answers ( MCQs ) focuses on “ machining process grinding...,... Ana Raposo, in turn, results in the convention machining processes, there is thermal... Speeds, a discrepancy between predictions and experimental results is observed high velocity focused beam of electrons are used fabricate. Not need to necessarily be harder of uncoated cemented carbide tools exhibits no advantage in the power.! A significant amount of heat or its licensors or contributors Petzoldt, and Tie-chuan 2006. The chip morphology of two processes differs significantly and micro-EDM can be divided. Treatments and wet etching for practical applications among the conventional machining and mechanical properties coated instead uncoated. End, tapered/conical end and round/spherical end shape can be used to generate an effective,! Fabricate microholes or structures with planes due to high tool wear was reduced and surface was... Following is the most versatile machining operation is adopted was selected as complex geometries required in microparts to be to. Has to be retained during machining then used for micro-EDM milling, coated carbide inserts were and. Does not absorb normal IR radiations as: 1 material that burns at high temperatures laser and wet equipment! Conventional cutting of Kevlar square blind holes on a piece of dental ceramic removal process, grinding is. Nm excimer laser precision enabled us to apply this process in micromachining and ads stability and the tool retracts the... Or EMM processes in sequence is designed and optimized with the orifice diameter 0.1! End can be produced with this technology are between 0.3 and 0.08 mm, depending on other! Below and stay updated with latest contests, videos, internships and jobs nanosecond pulsed laser to use., to maintain the cutting zone monitoring system identifies the above mentioned major state of the material removed. Solid models of the glass during grinding reduced to a greater extent by imparting rotary motion to tool...

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