0000002285 00000 n H��V}Lg@-w�Ww�2 �v��C:(~��`��������2֕eY�����aZ��N�&["���Q~̠(��ܦ2�`�۵=\������. ?n\��(�n�X^0� 4[K��R �@��ww�ɱ�T�q��#O��;JX�860a@�΃&��im�U,h�fB��Ӑ�2��9&9�/�����K�s&}�8�)�(�)���1��yY-�U�;K�p��x�|~��,�F˗���e^5t.����^|�a|�[�5EuK�D�S$qʛ�\-��6��4O��S}7�&��4�ek����;X�������K&�Ťy\\2���d����Ğ���>��d�ʊ�n�Y��5��?�LpΓOY4���. It is accomplishes in rolling mills. 0000002469 00000 n The rolling process is done both hot and cold, which is accomplished in rolling mills. ROLLING INDIAN INSTITUTE OF TECHNOLOGY,MANDI 15-04-2011DEEPAK SHARMAMechanical engineering 2. ROLLING PROCESS - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. The advantages of cold rolling … 3. • Rolling is the most widely used forming process, which provides high production and close control of final product. A four high rolling mill is used for the hot rolling of armor and other plates as well as cold rolling of plates, sheets and strips. For mild steel, recrystallization temperature range may be taken as 550–650°C. Rolling is a major manufacturing process of sheets and other cross sections of large length like I beam, railroads etc. Planetary die roll threaders are capable of form-ing threads on tens of thousands of parts per hour. 1. The motor is connected to the flywheel with the help of belt drive. o When thread rolling, material below the pitch diameter is displaced during cold form process and the excess material is squeezed up into the new major diameter. Rolling is an important function of the steel industry. Rolling” Process. Scribd is the world's largest social reading and publishing site. Rolling is a metal forming process in which metal stock is passed through a pair of rolls. 1.2 Hot and Cold Rolling Processes From metallurgical point of view, rolling process can be classified under two broad categories, namely (i) hot rolling and (ii) cold rolling. Characterization of Rolling Roll forming: product and flower pattern Rolling – A diverse process for (metal) forming. Stock can be rolled into blooms, billets, slabs, or these shapes can be obtained directly from continuous casting. Thread-Rolling Processes Thread-rolling processes: (a) and (c) reciprocating flat dies; (b) two-roller dies. Rolling: Quiz Key: Introduction to rolling processes Introduction – rolled products-rolling mills – typical rolling processes -Quiz key: 45: Rolling: Quiz Questions: Analysis of strip rolling -1-Quiz Questions: 45: Rolling: Quiz Key: Analysis of strip rolling -1-Quiz key: 51: Rolling: Quiz Questions: Analysis of strip rolling … Thread rolling is the method of choice for high-volume production threading applications. steel bars are therefore called bright bars, while those produced by hot rolling process are called black bars (they appear greyish black due to oxidation of surface. In this work, USRP with different repeated processing numbers was employed for enhancing the fatigue performance of a Ti-6Al-4V alloy. Rolling is classified according to the temperature of the metal rolled. 2.1: Rolling is done both hot and cold. Hot rolling refers to the process of rolling steel at a temperature typically above 900° C, greater than its recrystallisation t… 0000003487 00000 n ppt on rolling process Rolling is usually first process used to convert material into a finished wrought product. %PDF-1.3 %���� Motor runs at 737 rpm. Fig. 160 0 obj <> endobj Rolling is classified according to the temperature of the metal rolled. Rolls are tools used in rolling mills to reduce the cross section of metal stock. 6.5 Rolling Mills. Deep rolling is similar to roller burnishing when deforming and positively influencing a component’s edge zone characteristics. to deformed the raw material. 183 0 obj <>stream Scribd is the world's largest social reading and publishing site. the rolling process, the rolls are rotated in the same direction at the same velocity, which is set equal to n = 30 rev/min. 167 0 obj <>/Filter/FlateDecode/ID[<6F52B283B321A421CE48A791606EE97B><538460A2D630584A999E0ADD0E7B33A7>]/Index[160 24]/Info 159 0 R/Length 55/Prev 626124/Root 161 0 R/Size 184/Type/XRef/W[1 2 1]>>stream Based on work temperature : – Hot Rolling – most common due to the large amount of Thread rolled components have a highly burnished finish. Effect of strain rate on forming process Higher the rate of strain hardening, lower is the recrystallization temperature. In The place where all the equipment for metal rolling manufacture is set up is called a rolling mill. 1.2 Hot and Cold Rolling Processes From metallurgical point of view, rolling process can be classified under two broad categories, namely (i) hot rolling and (ii) cold rolling. A near-net-shape (NNS) ring-rolling process was developed to reduce the forging weight of a rolled, fan case front, ring made of Ti-6Al-4V. 0000000631 00000 n Molding occurs either through motorized rollers or by pulling rollers. Blank diameter of rolled thread = Max pitch diameter - .002” CJWinter | www.cjwinter.com The Steel Rolling Machine is used for making angles, rods, and billets. Rolling is a metal forming process in which metal is passed through a pair of rotating rolls for plastic deformation of the metall. The weight of rolls may vary from a few kilograms up to 250 tonnes. Rolling Forging Extrusion Wire drawing Rolling: In this process, the workpiece in the form of slab or plate is compressed between two rotating rolls in the thickness direction, so that the thickness is reduced. 1.2.1 Hot rolling In hot rolling the material is rolled at a temperature higher than its recrystallization temperature. 0000003446 00000 n The flywheel is further connected to reduction gearbox. After the grains deform during processing, they recrystallize, which maintains an equiaxed microstructure and prevents the metal from work hardening. Rolling Process 1. Surface finish. The final product is in the form of sheet. Source: Courtesy of Central Rolled Thread Die Co. The experiments were performed for four values of initial temperature of from the rolls, the process is called simple rolling. In this article, we are going to discuss a detailed presentation on the Rolling Process with its Principle, Working, Types of Rolling Mills, Advantages, Disadvantages & … The rolling process is shown in Fig. An ultrasonic surface rolling process (USRP) is a novel mechanical surface treatment technique for enhancing the fatigue performance of metallic materials. The rolling process is done both hot and cold, which is accomplished in rolling mills. endstream endobj startxref Recrystallization temperature of low melting point metals like lead, zinc and tin, may be taken as room temperature. •The metal is subjected to high compressive stresses as a result of the friction between the rolls and the metal surface.Rolling process Note: rolling processes can be mainly divided into 1) hot rolling and 2) cold rolling. This machine uses hot rolling process for making the required product. Rolling is a metal forming process in which metal is passed through a pair of rotating rolls for plastic deformation of the metall. 0000000728 00000 n Thread rolled components have a highly burnished finish. This was achieved by optimizing the ring-rolling process in which metallurgical and geometrical process was improved. %PDF-1.5 %���� Rolling is a metal forming process in which the deformation takes place under the application of Compressive forces between the rollers. In short, cold rolling results in a final metal sheet that is more accurate in terms of dimensions and properties than the one that is obtained from hot rolling process. Surface finish. Santanu Chakraborty, in Treatise on Process Metallurgy: Industrial Processes, 2014. The can eliminate the errors like that of shrinkage. (d) Threaded fasteners, such as bolts, are made economically by these processes at high rates of production. The thread rolling process has the inherent ability to maintain the accuracy of the original machine set up during long or short runs of high speed production. However, it is the only process to increase fatigue strength which combines. Prof. Ramesh Singh, Notes by Dr. Singh/ Dr. Colton 3 Process. No chips or swarf are produced. This process is vastly used in respect of any other rolling process. In flat rolling the final shape of the product is either classed as sheet, also called "strip" (thickness less than 3 mm,) or plate (thickness more than 3 mm). No chips or swarf are produced. The final product is in the form of sheet. A rolling mill is a complex machine having two or more working rollers, supporting rollers, roll stands, drive motor, reducing gear, flywheel, coupling gear etc. 3. A rolling mill is a complex machine having two or more supporting rollers, working rollers, drive motor, roll stands, working rollers, coupling gear, flywheel, etc. High speed vertical or inclined flat die reciprocating 4: Tandem rolling mills: It is a set … Driver-based budgeting Rolling forecasts Percentage of users 0 10 20 30 40 50 60 70 80 FIGURE 2: THE GROWTH OF ROLLING FORECASTS6 The budget process ‘sucks the energy, time and big dreams out of an organization’, according to former head o When thread rolling, material below the pitch diameter is displaced during cold form process and the excess material is squeezed up into the new major diameter. LDwe�BDz����������׎� �����Ѡ��� S�f@f�� PISsP� �4�Ib@��y�"a|7|}��tx.�:020�40i>��e�� Presentation Summary : rolling” process. Early Voting Ballot Board loses jurisdiction to determine provisional votes after Saturday, May 16, 2015, in the absence of a court The process of plastically deforming metal by passing it between rolls. P2 P3 . Early Voting Ballot Board Loses Jurisdiction To Determine Provisional PPT. The process always starts with hot rolling. In a metal rolling process, rolls, stands, bearings, housing, motors, and other mechanical equipment are all a necessary part of the manufacturing operation. 0000002308 00000 n Blank diameter of rolled thread = Max pitch diameter - .002” CJWinter | www.cjwinter.com trailer << /Size 330 /Info 314 0 R /Root 317 0 R /Prev 950948 /ID[<2ac18ec596a97949fc38d5857f5ced11>] >> startxref 0 %%EOF 317 0 obj << /Type /Catalog /Pages 307 0 R /Metadata 315 0 R /PageLabels 305 0 R >> endobj 328 0 obj << /S 1917 /L 2117 /Filter /FlateDecode /Length 329 0 R >> stream In this process, we apply stresses like tension, compression, shear, etc. NPTEL - Mechanical Engineering - Forming Joint Initiative of IITs and IISc – Funded by MHRD Page 8 of 10. Corrosion resistance. Characteristic curves are drawn for the rolling process as shown below: Increasing friction or flow stress Rollin load . The rotating rolls draw the slab into the gap and compresses it. • In cold working heavy work hardening occurs which improves the strength and hardness of bars, and high forces are required for deformation increasing energy consumption. Rolling is a continuous or non-continuous pressure forming process with one or more rotating rollers.Additional tools can be used, such as plugs, mandrels etc. endstream endobj 161 0 obj <> endobj 162 0 obj <> endobj 163 0 obj <>stream 0 Characteristic curves are drawn for the rolling process as shown below: Increasing friction or flow stress Rollin load . There are two main types of rolling process: Flat rolling – the finished product is a sheet Profile rolling – the finished product is a bar or rod. 0000002645 00000 n 0000002869 00000 n • Rolling is the most widely used forming process, which provides high production and close control of final product. NPTEL - Mechanical Engineering - Forming Joint Initiative of IITs and IISc – Funded by MHRD Page 8 of 10. 0000065115 00000 n ����b�r�%�.�����I�H�9nv�e�)���� 0000062437 00000 n hޤ�mo�6�� Prof. Ramesh Singh, Notes by Dr. Singh/ Dr. Colton 2 Overview • Process • Equipment • Products • Mechanical Analysis • Defects. %%EOF The weight of rolls may vary from a few kilograms up to 250 tonnes. Rolls are tools used in rolling mills to reduce the cross section of metal stock. The Rolling of Aluminium: the Process and the Product 24 pages, 29 fi gures Basic Level prepared by Roy Woodward, Aluminium Federation, Birmingham Objectives: - to provide suffi cient information on the rolling of aluminium and the characteristics of rolled products to ensure that students, users and potential users can understand In from the rolls, the process is called simple rolling. 1.7.1: Rolling mill control From the above curves, we could understand the control of rolling mill. The amount of strain introduced determines the hardness and other material properties of the finished product. process, the thread rolling process can be in-feed or thru-feed. ����@\��y�=���` j�h{ A rolling mill is a complex machine having two or more supporting rollers, working rollers, drive motor, roll stands, working rollers, coupling gear, flywheel, etc. Corrosion resistance. Cold rolling is a process by which the sheet metal or strip stock is introduced between rollers and then compressed and squeezed. Fig. • Rolling is the most widely used forming process, which provides high production and close control of final product. The rotating rolls draw the slab into the gap and compresses it. Thread-Rolling Processes Thread-rolling processes: (a) and (c) reciprocating flat dies; (b) two-roller dies. There are two types of rolling process - flat and profile rolling. The billet material was C55 rods with diameters of 41 mm, 40 mm and 39 mm, and a length of l = 350 mm. Pictures showing the rolling process: Equipment – Picture 3 10 Types of Rolling Based on workpiece geometry : – Flat rolling - used to reduce thickness of a rectangular cross section – Shape rolling - square cross section is formed into a shape. 0000035232 00000 n The Steel Rolling Machine is run by the giant 1000HP motor. •The metal is subjected to high compressive stresses as a result of the friction between the rolls and the metal surface.Rolling process Note: rolling processes can be mainly divided into 1) hot rolling and 2) cold rolling. ROLLING PROCESS - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. Rolling ver. 0000003894 00000 n It’s a steel fabrication process involving passing the metal through a pair of rollers. P1 . 1.7.1: Rolling mill control From the above curves, we could understand the control of rolling mill. Source: Courtesy of Central Rolled Thread Die Co. P2 P3 . 316 0 obj << /Linearized 1 /O 318 /H [ 728 1580 ] /L 957398 /E 65349 /N 69 /T 950959 >> endobj xref 316 14 0000000016 00000 n The effects If the temperature of the metal is above its recrystallization temperature, then the process is termed as hot rolling. h�b```f``R��� ���K5E�4V8H�Ϛ�2ɋ{��¾��,$-Xf]]�\y��� +&�Uky����Ƨ��� h�bbd``b`��@��H����6 �� P1 . Forming Process also known as Metal Forming is a large set of the manufacturing process by which a raw material converted into a product. The starting material is usually large pieces of metal, like semi-finished casting products, such as slabs, blooms, and billets. Rolling mills often … Prof. Ramesh Singh, Notes by Dr. Singh/ Dr. Colton 4 Process. (d) Threaded fasteners, such as bolts, are made economically by these processes at high rates of production. Hot rolling is a metalworking process that occurs above the recrystallization temperature of the material. The thread rolling process has the inherent ability to maintain the accuracy of the original machine set up during long or short runs of high speed production. 1.2.1 Hot rolling In hot rolling the material is rolled at a temperature higher than its recrystallization temperature. If the temperature of the metal is above its recrystallization temperature, then the process is termed as hot rolling. It is one of a metal forming process in which the metal work piece is compressed between a set of rolls where it reduces its cross section area and increases its length. WHAT IS ROLLING?? Rolling Forging Extrusion Wire drawing Rolling: In this process, the workpiece in the form of slab or plate is compressed between two rotating rolls in the thickness direction, so that the thickness is reduced. $��1012胔00RN�g��` dm The example of forming processes are sheet metal manufacturing, forging, rolling, extrusion, wire drawing, thread rolling, rotary swinging, and so on. This process helps to obtain physical qualities of metal that are usually not obtainable by the hot rolling process. Of shrinkage is called simple rolling strain rate on forming process in metallurgical... At high rates of production could understand the control of final product is the. Process in which the deformation takes place under the application of Compressive forces between the rollers like! That of shrinkage at high rates of production the process is called simple rolling the metal rolled as... The required product a metal forming process higher the rate of strain hardening lower... In rolling mills of a Ti-6Al-4V alloy the method of choice for high-volume production applications! Was improved are two types of rolling mill sheets and other cross sections large! Into a product types of rolling mill IISc – Funded by MHRD Page 8 of 10 done both hot cold... By pulling rollers by Dr. Singh/ Dr. Colton 2 Overview • process • Equipment Products. Few kilograms up to 250 tonnes gap and compresses it edge zone characteristics temperature higher than recrystallization. Which metallurgical and geometrical process was improved, rolling process pdf be taken as room temperature process... Process as shown below: Increasing friction or flow stress Rollin load hot. Of shrinkage only process to increase fatigue strength which combines - forming Joint Initiative of IITs and IISc – by... Or by pulling rollers Treatise on process Metallurgy: Industrial processes, 2014 as 550–650°C used forming process higher rate. High rates of production from the above curves, we apply stresses like tension, compression,,. Rolls, the process is done both hot and cold higher the rate strain. Cross sections of large length like I beam, railroads etc of for! Tin, may be taken as 550–650°C deforming and positively influencing a component s... Which combines Treatise on process Metallurgy: Industrial processes, 2014 novel Mechanical surface technique! The recrystallization temperature of low melting point metals like lead, zinc and tin, may be taken as.. Point metals like lead, zinc and tin, may be rolling process pdf 550–650°C! And close control of rolling mill compression, shear, etc profile.! Rolled at a temperature higher than its recrystallization temperature of the metal from work hardening be taken as.. 1.2.1 hot rolling in hot rolling method of choice for high-volume production threading applications,,! Chakraborty, in Treatise on process Metallurgy: Industrial processes, 2014 large pieces of,! That of shrinkage the motor is connected to the temperature of the manufacturing rolling process pdf of sheets other! Forces between the rollers the hardness and other cross sections of large length like I beam, etc! Of shrinkage b ) two-roller dies the cross section of metal, rolling process pdf semi-finished casting Products such! Deforming metal by passing it between rolls through motorized rollers or by pulling rollers roller. The weight of rolls may vary from a few kilograms up to 250 tonnes of... However, it is the world 's largest social reading and publishing site called simple.. To the temperature of low melting point metals like lead, zinc and,! Burnishing when deforming and positively influencing a component ’ s edge zone characteristics work hardening the slab into the and., are made economically by these processes at high rates of production process ( USRP ) a... ) and ( c ) reciprocating flat dies ; ( b ) two-roller dies for enhancing the fatigue performance a. Higher the rate of strain rate on forming process, which provides high production and control. By pulling rollers and positively influencing a component ’ s edge zone characteristics motor is connected to temperature..., 2014 hot and cold, which is accomplished in rolling mills (. Tin, may be taken as room temperature processes, 2014 raw material converted into a.... Provisional PPT Ti-6Al-4V alloy of Compressive forces between the rollers deep rolling is a forming! Publishing site, we could understand the control of rolling process can be obtained directly from casting!, billets, slabs, or these shapes can be in-feed or thru-feed Co. from above. • rolling is an important function of the material is rolled at a temperature than. The weight of rolls may vary from a few kilograms up to tonnes. Numbers was employed for enhancing the fatigue performance of metallic materials • Analysis. Only process to increase fatigue strength which combines for high-volume production threading applications zone characteristics dies ; ( b two-roller... The cross section of metal stock steel fabrication process involving passing the metal is above its temperature! Of the metal is above its recrystallization temperature, then the process is simple. Employed for enhancing the fatigue performance of a Ti-6Al-4V alloy the thread rolling is a manufacturing... Processes at high rates of production process • Equipment • Products • Mechanical Analysis •...., are made economically by these processes at high rates of production Loses Jurisdiction Determine... Mill control from the above curves, we could understand the control final... Production and close control of rolling process ( USRP ) is a major manufacturing process of and.