What form of energy is used in electrosugical cutting? 2. What are the modes of electrosurgery?
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What form of energy is used in electrosugical cutting? 2. What are the modes of electrosurgery?
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- The frontal working area of the electrode in an ECM operation is 2000 mm?. The applied current is 2000 amps and the voltage is 12 volts. The material being cut is nickel (valence = 2, CN; =3.42x10-2mm2/A-s). (a) If the process is 90% efficient, determine the cutting rate into the workpart. (b) If the resistivity of the electrolyte is 160 ohm – mm, determine the working gap. Tool feed Tool holder and feed mechanism Formed tool (cathode). Electrolyte flow -Insulation Electrolyte Work (anode) feed mm/min gap micrometersOutline the principle of Electro Discharge Machining (EDM) and its scope of use in industry.(Electrochemical Machining) An ECM operation is used to cut a hole into a plate of stainless steel that is 10 mm thick. The hole has a rectangular cross section, 15 mm by 25 mm. The operation is accomplished at a current = 1300 amps. Efficiency is 97%. Determine the feed rate and time to cut through the plate. The specific removal rate C for stainless steel = 2.46 × 10-2 mm3/A-s. R - V = CIt I = V = gr A V At fr EA gr C(EAt) gr fr CI A CE gr Typical values of specific removal rate C' for selected work materials in electrochemical machining. Compiled from data in [11]. Specific Removal Rate C Materialª mm³/amp-sec (in³/amp-min) Materialª Aluminum (3) Copper (1) Iron (2) Nickel (2) 3.44 x 10-2 7.35 × 10-2 3.69 × 10-2 (1.26 × 10-4) (2.69 x 10-4) (1.35 × 10-4) 3.42 × 10-2 (1.25 × 10-4) X Low alloy steel High alloy steel Stainless steel Titanium (4) Specific Removal Rate C mm³/amp-sec (in³/amp-min) (1.1 × 10-4) 3.0 x 10-2 2.73 × 10-2 2.46 × 10-2 (1.0 × 10-4) (0.9 × 10-4) 2.73 x 10-2 (1.0 ×…
- Which of the following processes resulted in metallurgical damage to the cut surface: a. Ultrasonic machining b. Water jet cutting C. Plasma arc cutting d. Electrochemical machining e. None of themWhat workholding device can extend the magnetic field of the magnetic chuck and quickly position and hold work at a 45-degree angle?Question 1. Provide brief explanations to each one of the following questions: 1.a. Explain why studying the types of chips produced is important in understanding cutting operations. 1.b. Describe the reasons for and advantages of coating cutting tools with multiple layers of different materials. What are the possible effects of these coatings on the developed chip during cutting process 1.c. Describe the reasons for and advantages of coating cutting tools with multiple layers of different materials. 1.d. Emulsion cutting fluids typically consist of 95% water and 5% soluble oil and chemical additives. Why is the ratio so unbalanced? Is the oil needed at all? 1.e. What is the difference between a live center and a dead center, when these terms are used in the context of workholding in a lathe?
- 3. Electrode This is usually made of graphite, brass, copper and copper tungsten alloys and is needed in electrical-discharge machining to create spark with an electrically charged workpiece. a. Dielectric fluid b. Electrolyte c. Electrode d. Wire 4. Mechanical Which of the following is NOT included in the energy sources utilized in advanced machining. a. Chemical b. Electrical c. Laser d. Mechanical 5. In performing electrochemical machining , the following are necessary in the process except. a. Electrolyte b. Power supply c. Shaped tool d. Dielectric fluidList the four common variations of the conventional plasma cutting process and describe the benefits of each.Manufacuring Processes An electro chemical machining (ECM) operation is employed too cut a square hole in a copper plate of 18 mm thickness. The dimensions of the hole is 20 mm on each side, however, the electrode dimension shall be slightly less than 20 mm to allow for overcut, and its shape includes a hole in its center to permit the flow of electrolyte and reduce the area of cut. The frontal area of electrode is 180 mm2. The specific removal rate for copper is C = 7.35 x 10-2 mm3/A-s. The applied current is 950 A. At 90 % efficiency, determine the time required to cut a hole of required dimensions.
