Metal spinning does not involve removal of material, as in conventional wood or metal turning, but forming moulding of sheet material over an existing shape. This paper is the latest of a continuing series on the subject of selfexcited machine tool chatter. Manufacturing technology theory of metal cutting metal cutting or machining is the process of producing a work piece by removing unwanted material from a block of metal, in the form of chips. Current research focused on the assessment of metal machining process parameters and on the development of adaptive control, shows that machine performance, workpiece and tool material selections, tool life, quality of machined surfaces, the geometry of cutting tool edges, and cutting conditions are closely related to the cutting forces. The representation of the metal cutting process as required by the previously developed closedloop chatter theory is extended to oblique cutting with tools of practical shape and geometry. This process is most important since almost all the products get their final shape and size by metal removal, either directly or indirectly. No cutting tool is perfectly sharp, and in the idealized picture as shown in figure 2 the cutting edge is represented by a cylindrical surface joining the tool flank and tool face. Fundamentals of metal casting overview of casting technology. Metal forming processes indian institute of technology. In this article we mainly focus on sheet metal cutting operations and. The various types of cutting tool materials are used in tools for remove metal from workpiece.
Performed by a multipletooth cutting tool by moving linearly relative to the work in the direction of the tool axis. Today i will tell you about types of chips in metal cutting form during machining process. I get a chance i will try to provide you with some notes on this one. The first one is sheet metal cutting, second one is sheet metal bending or forming and the last one is known as deep drawing. Machining is a process of cutting metal work piece by means of a tool to convert it into desire shape. If depth of cut of 2 mm is used then find out cutting speed.
The cloth buff holds or carries the compound, while the compound does the cutting. The molten metal is transferred to the pouring area where the moulds are filled. There is an optimum mixing ratio mass fraction of the abrasive in the jet for which the metal removal rate is the highest. Catastrophe failure temperature sensitive region flank wear formation depends on. Contentcommon features of machining processes, geometry of single point tool and tool signature, concept of speed, feed and depth of cut applicable to various machining processes. Hello, i welcome you all in this presentation related with the subject fundamentals of the. Theory of metal machining overview of machining technology theory of chip formation in metal machining force relationships and the merchant equation power and energy relationships in machining cutting temperature.
A material removal process in which a sharp cutting tool is used to mechanically cut away material so that the desired part geometry remains most common application. Introduction of machining or metal cutting lecture 17. This is nothing but cutting of sheets by shearing action. If youre looking for a free download links of welding and metal fabrication pdf, epub, docx and torrent then this site is not for you. Included in this category are robots, highspeed machinery, and highspeed rotating shafts for ships or land vehicles. The resultant too force in metal cutting is distributed over the areas of the tool that contact the chip and workpiece. Metal casting processes indian institute of technology. Before discussing on this topic, first you should know about machining process. Common cutting processes include sawing, shaping or planing, broaching, drilling, grinding, turning and milling.
Economics of metal cutting 1 free download as powerpoint presentation. Mechanics of machining metal cutting control of cutting. Welcome viewers to the last lecture of our course metal cutting and machine tools. Lecture series on manufacturing processes ii by prof. Economics of metal cutting 1 machining mathematical. Thermal aspects of machining learning objectives heat generation in metal cutting temperature distribution in work and chip in orthogonal cutting measurement of temperature in metal cutting introduction. Usually, the portion that is fractured away is in small sized pieces, called chips. Generally, the tool must be harder than the work material. Metal finishing systems l 18007472637 introduction to buffing buffing is the process used to shine metal, wood, or composites using a cloth wheel impregnated with cutting compounds or rouges. Shear strength of metal along shear plane is not affected by normal stress. Nptel provides elearning through online web and video courses various streams.
Report theory of metal cutting please fill this form, we will try to respond as soon as possible. Grinding and finishing illegitimi non carborundum ver. Metal cutting cutting processes work by causing fracture of the material that is processed. So, welcome to the third lecture of the course metal cutting and machine. Description download theory of metal cutting comments. As a steelworker, you need to understand the effect that heat treatment has on metals so you can attain the desired properties for a particular metal. The following are to links of sheet metal design resources, tools, articles and other useful data. Paul,department of mechanical engineering, iit kharagpur. Chapter 4 metal matrix composites princeton university. You also need to know what methods can be used to restore a metal to its original. Metal spinning ranges from an artisans specialty to the most advantageous way to form round metal parts for commercial applications. Should you find any errors omissions broken links, please let us know feedback. Cutting fluids coolants cutting fluid metalworking fluid, coolant is a liquid used in metalworking operations for reducing friction between the work piece and the tool and for removal of the heat generated by the friction.
According to the first law of thermodynamics, when work is transformed into heat, the quantity of heat produced is. The mass flow rate of the abrasive particles depends on the pressure and the flow rate of the gas. Typically, a large majority above 80% of all the machine tools used in manufacturing industry are metal cutting in nature. If depth of cut of 2 mm is used then find out cutting speed and volumetric material removal rate mrr. Steady state region temperature insensitive region 3. Metal forming is the main method of making metal products and semifinished products. Draw a neat sketchof the milling operation describing aboveconditions. Longer term applications metal matrix composites with high specific stiffness and strength could be used in applications in which saving weight is an important factor.
Essential in metal cutting operations to reduce heat and friction centuries ago, water used on grindstones 100 years ago, tallow used did not cool lard oils came later but turned rancid early 20th century saw soap added to water soluble oils came in 1936 chemical cutting fluids introduced in 1944 2. Conventional machining processes and machine tools moduleiv turning turning operation is a machining process and is used to produce round parts in shape by a single point cutting tool. If you continue browsing the site, you agree to the use of cookies on this website. Materials are removed by traversing in a direction parallel to the axis of. Cleaning cleaning involves removal of sand, scale, and excess metal from the casting. Economics of metal cutting operations in production slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Cutting conditions f, d, v, tool angles properties of work material and tool material. Analytical and experimental determination of cutting forces. If the required power is not available to make sure that machining happens, then there will not be any metal removal or the metal cutting.
Welcome viewers to the nineteenth lecture of the course metal cutting and machine. Melting and pouring the preparation of molten metal for casting is referred to simply as melting. The machining of material is highly dependable on chips. Mainly sheet metal process can be divided into three types. Welcome viewers to the 2nd lecture of the course metal cutting. Metal cutting and machine tools indian institute of technology, kharagpur and nptel via swayam. Sawing hacksawing, bandsawing, and circular sawing. Stresses beyond yield strength of the workpiece material is required.
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