7. d. Electro-chemical etching takes place To analyze this process in detail, a 2-D model of it is represented in Fig. There are a ton of subtractive production methods, such as CNC turning, milling, and more. Unlike other manufacturing techniques, the ultrasonic machining process has unique benefits. The amplitude, ξ, of the ultrasonic tool before machining can be measured by using either an accelerometer , an eddy current probe 30, 85, a laser dopplermeter or laser speckle pattern interferometer . You can change your ad preferences anytime. b. The smaller the grain size smoother the surface obtained, but it reduces material removal rate. The piezo-driven ultrasonic tooling system moves the diamond tool in a linear oscillatory motion with a unique frequency of 100 000 Hz, whereby the tool life is extended by orders of magnitude. As the tool vibrates, it makes abrasive particle to vibrate at this high frequency. Match List-I (Machining process) with List-II (Associated medium) and select the correct answer using the codes … Using abrasive slurry between the tool and work. (Ans:c) A higher amplitude is obtained by using a tool with a high transformation ratio, i.e. … (Ans:a) It is capable of removing materials from almost all types of materials, whether strong or brittle parts, such as ceramic. Unconventional Machining Process Objective TYpe Questions. $(".your-captcha .wpcf7-not-valid-tip").html("Incorrect"); d. ii & iii movement of the tool produces a chip which moves up the face of the tool. b. dielectric medium Ultrasonic machining can cut glass, sapphire, engineered ceramics, silicon carbide, quartz, single-crystal materials, PCD, ferrite, graphite, glassy carbon, composites and piezoceramics, among other materials. In this process abrasives contained in the slurry are driven against the work by a tool oscillating at low amplitude (25–100 microns) and high frequency (15–30 kHz). A distinction is made between all-purpose and specialized ultrasonic machine tools. – Machining ceramics, carbides, glass, precious stones, and hardened steels, – Create microelectromechanical system components such as micro-structured glass wafers, – Manufacture parts with high precision and tolerance. Although manufacturing technologies are well developed for materials like metals and their alloys, considerable problems still exist in the fabrication of hard and brittle materials including ceramics and glass. – Idea choice for ceramic matrix composites, glass, quartz, diamonds, PCD, etc. Ultrasonic Machining (USM) and Ultrasonic Machining Tool: The use of ultrasonics in machining was first proposed by L. Balamuth in 1945. Ultrasonic machining is a contemporary manufacturing method usually employed for processing materials with higher hardness/brittleness such as quartz, semiconductor materials, ceramics etc. Ultrasonic machining, also known as ultrasonic vibration machining, is a subtractive manufacturing process that utilizes an ultrasonic tool to remove excess material from a workpiece through high frequency, low amplitude vibrations with fine abrasive particles. Machining glass, ceramic, tungsten and other hard carbide, gemstones such as synthetic ruby. Erosion takes place both on Work piece and the tool. Ultrasonic machining (USM) of materials Ultrasonic machining is an economically viable operation by which a hole or a cavity can be pierced in hard and brittle materials, whether electric conductive or not, using an axially oscillating tool. 3. d. none of these a. Which the following is true for Electrical Discharge machining (EDM)? See our User Agreement and Privacy Policy. The material to be processed will affect the selection of the machining process. The ultrasonic generator converts the power frequency AC power into an ultrasonic frequency oscillation with a certain power output. i. In ultrasonic machining, tool is made of. Principle of Ultrasonic Machining • During one strike, the tool moves down from its most upper remote position with a starting speed at zero, then it speeds up to finally reach the maximum speed at the mean position. Integrated into any commercially available precision and ultra-precision machine, leaving a precise reverse image the! Soft steels and nickel back to later aspects ( MGU S8 ME ), No public clipboards for! Using the ultrasonic frequency oscillation into an ultrasonic machine tools, using the ultrasonic machining never... Machining was first proposed by L. Balamuth in 1945 & iii ( Ans a. And remove metal form it found for this slide to already for processing materials with higher such. 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