Introduction to Basic Manufacturing Processes and ... - always yours

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25.6 QUESTIONS Powder Metallurgy 465 1. What do you under stand by powder metallurgy? What are the main stages of powder metallurgy process? 2. What important considerations should be made in designing the powder metallurgy products? 3. Explain the objectives of powder compaction and list important products of powder metallurgy. 4. Describe briefly the methods by which powders suitable for powder metallurgy can be produced. Also enumerate the main characteristics of metal powder. 5. Describe the atomization process of making powder in detail. 6. What are the effects of sintering on the powder compact produced by pressing? 7. Describe the process of blending, compacting and sintering in detail. 8. What are the effects of sintering on the powder compact produced by pressing? 9. Name the products of powder metallurgy. 10. List the advantages, dis-advantages and applications of powder metallurgy process. 11. It is necessary to use lubricants in the press compaction of powders? Explain. 12. What are ‘cermets’? Give a few examples of useful applications 13. State briefly the process of making a powder metallurgy product having improved properties. 14. What are cemented carbides? How are they processed?
466 Introduction to Basic Manufacturing Processes and Workshop Technology 26 CHAPTER INSPECTION AND QUALITY CONTROL 26.1 INTRODUCTION Inspection or checking of components or products with required specifications is very minutely related with quality control. It is generally an accepted fact that no two things can ever be exactly same. It also holds true with manufactured parts. Therefore certain variations or deviations in dimensions and other product specifications are accepted. However, only few produced articles or parts may be rejected if the deviations go beyond the specified quality standards. Therefore it becomes essential to detect errors so that the manufacturing of faulty product does not go uncorrected. The philosophy of inspection is only preventive and not remedial. In other words the inspection of products is measuring or checking its quality in terms geometrical tolerances of other specified feature of needed design. Generally, there are three basic areas of inspection namely receiving inspection, in-process inspection and final inspection. In the receiving inspection, inspections are performed on all incoming materials and purchased parts. In the in-process inspection the products are inspected as they are in processed in stages from starting station to finished station. In the final inspection, all finished products or parts are inspected finally prior to delivering them to the customer. The main motive of manufacturing is to process engineering materials and produce desired and useful components or products to the specified shape, size and finish. The specifications for the shapes, sizes and finishes on the products are furnished by the manufacturing operations through specified process plan using part drawings or manufacturing drawings. These specifications basically termed as called quality characteristics. The quality of manufactured product is depend always upon the process capability of controlling manufacturing functions which may lead to a certain amount of variation as a result of chance and some cause. Also some chance or cause is inherent in any particular scheme of production and inspection. The reasons for variation outside this stable system should be discovered and corrected to minimize wastage and finally to improve quality. 26.2 TOLERANCES ON PARTS It is difficult to manufacture any product or component to its exact size. Tolerance on the parts is therefore the amount of variation in size tolerated to cover reasonable imperfections in workmanship and it varies with different grades of work. Tolerance on a dimension can also be specified as the difference between the maximum limit of size and the minimum limit 466
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PREFACE Manufacturing and workshop
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1 CHAPTER INTRODUCTION 1.1 INTRODUC
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Introduction 3 material into finish
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1.7.3 Metal Forming Processes Intro
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Introduction 7 security procedures
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Introduction 9 FMS and Computer Int
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Introduction 11 towards economic an
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Introduction 13 capabilities of the
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Introduction 15 particular applicat
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2 CHAPTER PLANT AND SHOP LAYOUT 2.1
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Plant and Shop Layout 19 5. Working
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Plant and Shop Layout 21 according
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Plant and Shop Layout 23 5. Better
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Plant and Shop Layout 25 7. Machine
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28 Introduction to Basic Manufactur
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Non-Ferrous Materials 77 impurities
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Non-Ferrous Materials 79 It is made
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Applications Non-Ferrous Materials
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Non-Ferrous Materials 83 5.3.1.8 Gi
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Non-Ferrous Materials 85 springs, h
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5.4.2 Nickel Alloys Non-Ferrous Mat
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5.5 LEAD Non-Ferrous Materials 89 L
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Applications Non-Ferrous Materials
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Non-Ferrous Materials 93 (iv) (v) C
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Non-Ferrous Materials 95 produced i
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Non-Ferrous Materials 97 polymers,
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Non-Ferrous Materials 99 vessel mat
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Binocular Body Non-Ferrous Material
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Melting Furnaces 103 2. Steel (a) E
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Melting Furnaces 105 Blower Stove B
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1. Well Melting Furnaces 107 The sp
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Melting Furnaces 109 operations. In
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Melting Furnaces 111 The chemical c
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Melting Furnaces 113 Firing Door Fi
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Melting Furnaces 115 20 What is ref
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4. Specific Gravity Porperties and
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Porperties and Testing of Metals 11
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12. Creep Porperties and Testing of
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7.5 QUESTIONS Porperties and Testin
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Heat Treatment 131 (b) Movable type
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Heat Treatment 133 steels, in iron
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8.6.1.2 Ferrite Heat Treatment 135
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Heat Treatment 137 1. Normalizing 2
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Annealing is of two types (a) (b) P
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Heat Treatment 141 Sudden cooling o
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Heat Treatment 143 of temperature a
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Advantages of Aus-Tempering Heat Tr
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Heat Treatment 147 carbon steel is
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Heat Treatment 149 In the induction
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Heat Treatment 151 6. Write short n
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Carpentry 153 heartwood, sapwood, p
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Carpentry 155 The proper time of cu
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Carpentry 157 9.5 DEFECTS IN TIMBER
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9.8 FACTORS INFLUENCING TIMBER SELE
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Albumen glue Carpentry 161 It is pr
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Carpentry 163 The steel blade and m
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Carpentry 165 Jaw Clamp Trigger for
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Crosscut Saw Carpentry 167 Cross cu
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Jointer Plane Carpentry 169 When a
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Carpentry 171 pattern making and wh
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Forstner bits These are used for bo
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Pincer Carpentry 175 Pincers are co
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Carpentry 177 2. Circular Saw A cir
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10 CHAPTER PATTERN AND CORE MAKING
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Pattern and Core Making 181 quality
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Pattern and Core Making 183 Disadva
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3. Cope and drag pattern Pattern an
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Pattern and Core Making 187 11. Seg
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Pattern and Core Making 189 density
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Pattern and Core Making 191 Core bo
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5. Back saw 6. Panel saw 7. Miter s
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Pattern and Core Making 195 16. Pro
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11 CHAPTER FOUNDRY TOOLS AND EQUIPM
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Strike off bar Foundry Tools and Eq
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Foundry Tools and Equipments 201 Fi
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Foundry Tools and Equipments 203 re
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11.4.2 Classification of Moulding M
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Foundry Tools and Equipments 207 5.
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12.3 CONSTITUENTS OF MOLDING SAND M
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Mold and Core Making 211 some speci
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12.4.7 Parting sand Mold and Core M
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Mold and Core Making 215 increased
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12.6. 5 Strength Test Mold and Core
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Mold and Core Making 219 Balanced t
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Mold and Core Making 221 mixture we
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Mold and Core Making 223 Molding sa
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5. Runner Mold and Core Making 225
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12.12 ROLE OF RISER IN SAND CASTING
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12.15 CORE SAND Mold and Core Makin
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12.16.2.2 Core ramming machines Mol
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12.20.1 Bench Molding Mold and Core
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Mold and Core Making 235 This hard
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Mold and Core Making 237 Stirrer Pl
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Mold and Core Making 239 11. What i
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13 CHAPTER CASTING 13.1 INTRODUNCTI
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Casting 243 gravity only and no ext
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Casting 245 (iv) (v) Opening the di
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Casting 247 Applications 1. Carbure
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Casting 249 containing a mixture of
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Semi-Centrifugal Casting Casting 25
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Casting 253 Table 13.1: Probable Ca
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16. Swells 1. Too soft ramming of m
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13.12 QUESTIONS Casting 257 1. Desc
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51. Explain the causes and remedies
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Advantages of forging Some common a
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Forging 263 on it. Forgeable metals
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14.4.6 Open fire and stock fire fur
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Forging 267 10. The place of the me
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Forging 269 pickling in acid, shot
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Hand hammers Forging 271 There are
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Shovel Forging 273 Shovel generally
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Forging 275 opposite to drawing and
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Forging 277 Spring hammers may be m
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14.12 REMOVAL OF DEFECTS IN FORGING
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Forging 281 7. Pneumatic riveting m
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Hot Working of Metals 283 between a
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Hot Working of Metals 285 4. Porosi
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Hot Working of Metals 287 type of t
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Hot Working of Metals 289 Hot pirci
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Hot Working of Metals 291 the punch
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16 CHAPTER COLD WORKING 16.1 INTROD
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16.5 ADVANTAGES OF COLD WORKING Col
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Cold Working 297 Cold working proce
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Cold Working 299 steels are used in
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Cold Working 301 seaming and spinni
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Cold Working 303 Each section must
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Cold Working 305 12. What is impact
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Welding 307 Toe Fusion zone Weld fa
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Welding 309 2. Horizontal position
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Welding 311 5. Gas Metal Arc Weldin
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Welding 313 2. Carburizing welding
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Welding 315 could occur if the cyli
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Welding 317 8. For repairs, calibra
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Welding 319 mains electricity suppl
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Welding 321 6. Chipping hammer Chip
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Welding 323 2. Shielded metal arc w
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Electric power source Welding 325 B
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Welding 327 13. Welders and workers
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Welding 329 Where H = heat generate
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17.7.1.2 Resistance Seam Welding We
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Welding 333 5. Surface of the jobs
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17.8.3 Explosive Welding Welding 33
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Welding 337 be scattered. This scat
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Welding 339 Porosity Fig. 17.31(iii
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Welding 341 (b) (c) Bad welding tec
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Welding 343 exceeding 450°C and be
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Welding 345 7. What effect does wel
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Welding 347 (i) Spot welding (ii) S
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1. Black Iron Sheet Sheet Metal Wor
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Sheet Metal Work 351 (g) Bossing ma
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Sheet Metal Work 353 10. Blow horn
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Sheet Metal Work 355 4. Trammel. Fi
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Sheet Metal Work 357 18.4 FOLDING T
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Sheet Metal Work 359 4. Hem (single
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Sheet Metal Work 361 moveable. When
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Sheet Metal Work 363 4. Blanking. I
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Fitting 365 scriber, semi-circular
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9. Miscellaneous Tools Fitting 367
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19.2.1.11 Surface Gauge or Scribing
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Fitting 371 machined true to keep t
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Fitting 373 the thimble the spindle
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19.2.3.3 Caliper Fitting 375 Calipe
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0 .44 1.5 Fitting 377 12mm 0 5 1015
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Fitting 379 Scriber Spirit-level Sq
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Fitting 381 4. Ring gauge 5. Snap g
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19.2.4.1.3 Universal swivel base ma
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Fitting 385 (A) Type of Cut The mos
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Fitting 387 1. Hand file 2. Flat fi
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Fitting 389 Hand drill Pneumatic dr
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S h a n k D ia Fitting 391 in Fig.
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19.2.7.1 Pliers Fitting 393 Pliers
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Fitting 395 graded from fine to coa
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20 CHAPTER METAL CUTTING 20.1 INTRO
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Metal Cutting 399 turning, facing a
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(vii) Nose radius Metal Cutting 401
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Metal Cutting 403 Continuous chip D
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Metal Cutting 405 20.7 QUESTIONS 1.
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Lathe Machine 407 2. Centre or engi
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Lathe Machine 409 1. Bed 2. Head st
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Lathe Machine 411 1. End of bed gea
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Lathe Machine 413 It is rotated by
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Page 436 and 437: 22.7 CUTTING SPEED Drilling Machine
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Page 460 and 461: Milling 457 A B Straddle milling (m
Page 462 and 463: 25.2.1 Production of Metal Powders
Page 464 and 465: Particle shape Powder Metallurgy 46
Page 466 and 467: Powder Metallurgy 463 3. The dimens
Page 470 and 471: Inspection and Quality Control 467
Page 472 and 473: 26.3.7 Fundamental Deviation Inspec
Page 478 and 479: INDEX A A feeler gauge 381 Abrasive
Page 480 and 481: Index 477 Cartridge brass 81 Case h
Page 482 and 483: Index 479 Core sand preparation 230
Page 484 and 485: Index 481 First aid 30, 39, 41, 49,
Page 486 and 487: Index 483 High speed steels 62, 66,
Page 488 and 489: Index 485 Mechanical properties 116
Page 490 and 491: Index 487 Pattern construction 195
Page 492 and 493: Index 489 Role of riser 227 Roll fo
Page 494 and 495: Index 491 Surface cleaning process
Page 496: Index 493 W Water seasoning 156 Wax
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