Showing posts with label Manufacturing engineering. Show all posts
Showing posts with label Manufacturing engineering. Show all posts

Saturday, April 20, 2019

Machine Tools and Machining Operations



From S.B. Mathur, A Course in Mechanical Engineering (Conventional & Objective)

Lathe

Shaper

Planer

Slotter

Milling Machine

Drilling Machines

Boring Machines

Grinding

Gear Manufacturing





Lathe

Lathe Operations

1. Turning
2. Taper turning
3. Thread cutting
4. Chamfering
5. Knurling
6. Facing
7. Grooving
8. Forming
9. Filing
10. Polishing
11. Reaming
12. Drilling
13. Boring

Shaper

Planer

Slotter

Milling Machine

Milling Machine Operations

Peripheral Milling
  UpMilling
  DownMilling

Face Milling
End Milling

Plain Milling
Side Milling
Straddle Milling
Gang Milling
Profile Milling
Form Milling

Thread Milling
Cam Milling
Helical Milling
Gear Cutting
Saw Milling

Drilling Machines

Drilling Machine Operations

Drilling
Reaming
Boring
Counter Boring
Countersinking

Boring Machines

Grinding


Types of Grinding

1. Rough or non-precision grinding
2. Precision grinding

Kinds of Precision Grinding

1. External cylindrical grinding
2. Internal cylindrical grinding
3. Surface grinding
4. Form grinding

Gear Manufacturing

Different Methods

Formed Cutter Method

Templet Method

Generating Methods


Updated  21 April 2019, 18 April 2019

Friday, April 19, 2019

Welding Handbook - American Welding Society - 10th Edition


Welding Handbook - American Welding Society - 10th Edition

Table of Contents
PART I — THE SCIENCE OF WELDING, CUTTING, AND ALLIED PROCESSES
CHAPTER 1 – SURVEY OF JOINING, CUTTING, AND ALLIED PROCESSES
Introduction
Joining Processes
Resistance Welding
Cutting Processes
Thermal Spraying
Conclusion
Bibliography
Supplementary Reading List
CHAPTER 2 – PHYSICS OF WELDING AND CUTTING
Introduction
Fusion and Solid-State Welding
Energy Sources for Welding
Arc Characteristics
Metal Transfer
Melting Rates
Physical Properties of Metals and Shielding Gases
Conclusion
Bibliography
Supplementary Reading List
CHAPTER 3 – HEAT FLOW IN WELDING
Introduction
Fundamentals of Heat Flow
Quantitative Calculation of Heat Transfer in Fusion Welding
Conduction of Heat during Fusion Welding
Convective Heat Transfer in the Weld Pool
Relative Importance of Conduction and Convection
Heat Flow in Dissimilar Welding
Heat Flow in Solid-State Welding
Conclusion
Bibliography
Supplementary Reading List
CHAPTER 4 – WELDING METALLURGY
Introduction
Physical Metallurgy
Metallurgy of Welding
Weldability of Some Commercial Alloys
The Brazed or Soldered Joint
Corrosion in Weldments
Conclusion
Bibliography
Supplementary Reading List
CHAPTER 5 – DESIGN FOR WELDING
Introduction
Connection Design
Basics of Welded Connections
Principles of Connection Design
Economics of Welding
Quality and Connection Design Detailing
Detailing of Welds
Sizing of Steel Welds
Special Conditions
Other Alloys
Examples
Conclusion
Bibliography
PART II — DESIGN CONSIDERATIONS
CHAPTER 6 – SYMBOLS FOR JOINING AND INSPECTION
Introduction
Fundamentals
Weld Symbols
Welding Symbols
Welding Symbols for Specific Weld Types
Brazing Symbols
Soldering Symbols
Nondestructive Examination Symbols
Conclusion
Bibliography
Supplementary Reading List
CHAPTER 7 – RESIDUAL STRESS AND DISTORTION
Introduction
Fundamentals
Nature and Causes of Residual Stress
Effects of Residual Stress
Measurement of Residual Stress in Weldments
Residual Stress Distribution Patterns in Typical Welds
Effects of Welding Sequence on Residual Stress
Residual Stress and Distortion in Welds Made with Different Welding Processes
Computational Weld Modeling
Weld Distortion
Reducing or Controlling Residual Stress and Distortion
Conclusion
Bibliography
Supplementary Reading List
CHAPTER 8 – ECONOMICS OF WELDING AND CUTTING
Introduction
The Cost Estimate
Economics of Welding
Automated and Robotic Systems
Economics of Resistance Spot Welding
Capital Investment in Welding Automation and Robotics
Control of Welding Costs
Economics of Brazing and Soldering
Economics of Thermal Cutting
Conclusion
Bibliography
Supplementary Reading List
PART III — AUTOMATION OF JOINING PROCESSES
CHAPTER 9 – MECHANIZED, AUTOMATED, AND ROBOTIC WELDING
Introduction
Mechanized Welding and Cutting
Automated Welding
Robotic Welding
Planning for Automated and Robotic Welding
Conclusion
Bibliography
Supplementary Reading List
CHAPTER 10 – WELDMENT TOOLING AND POSITIONING
Introduction
Fixtures
Positioners
Conclusion
Bibliography
Supplementary Reading List
CHAPTER 11 – MONITORING AND CONTROL OF WELDING AND JOINING PROCESSES
Introduction
Principles of Monitoring and Control
Sensing Devices
Process Instrumentation
Process Monitoring Systems
Process Control Systems
Monitoring and Control Systems
Conclusion
Bibliography
Supplementary Reading List
PART IV — QUALITY, TESTING STANDARDS, AND METHODS
CHAPTER 12 – WELD QUALITY
Introduction
Defining Weld Quality
Overview of Weld Discontinuities
Discontinuities Associated with Fusion Welding
Discontinuities Associated with Resistance Welding
Discontinuities Associated with the Solid-State Welding Processes
Discontinuities in Brazed and Soldered Joints
Significance of Weld Discontinuities
Conclusion
Bibliography
Supplementary Reading List
CHAPTER 13 – TEST METHODS FOR EVALUATING WELDED JOINTS
Introduction
Testing for Strength
Hardness Testing
Bend Testing
Fracture Toughness Testing
Fatigue Testing
Corrosion Testing
Creep and Rupture Testing
Testing of Thermal Spray Applications
Weldability Testing
Conclusion
Bibliography
Supplementary Reading List
CHAPTER 14 – WELDING INSPECTION AND NONDESTRUCTIVE EXAMINATION
Introduction
Personnel Qualifications
The Inspection Plan
Nondestructive Examination
Metallographic Examination Methods
Inspection of Brazed and Soldered Joints
Conclusion
Bibliography
Supplementary Reading List
CHAPTER 15 – PERSONNEL QUALIFICATION AND CERTIFICATION
Introduction
Welding and Brazing Procedure Specifications
Qualification of Welding and Brazing Procedures
Performance Qualification
Standardization of Qualification Requirements
Conclusion
Bibliography
Supplementary Reading List
CHAPTER 16 – CODES AND OTHER STANDARDS
Introduction
Types of Regulatory Documents
Standards-Developing Organizations and Welding-Related Publications
Guidelines for Participating in International Standards Activities
Conclusion
Supplementary Reading List
PART V — SAFETY AND HEALTH
CHAPTER 17 – SAFE PRACTICES
Introduction
Safety Management
Protection of the Work Area
Personal Protective Equipment
Protection against Fumes and Gases
Safe Handling of Compressed Gases
Protection against Electromagnetic Radiation
Electrical Safety
Fire Prevention and Protection
Explosion Prevention
Process-Specific Safety Considerations
Safety in Robotic Operations
Conclusion
Bibliography
Supplementary Reading List


https://www.aws.org/publications/page/10th-edition-volume-1

Brazing

The Brazing Process

Torch Brazing

Resistance Brazing

Furnace Brazing

Dip Brazing

Dip Brazing

Silver Brazing


The Brazing Process

The temperature at which  brazing  material melts should be above 1000 degree F. This temperature  at which brazing has to be done has to be well below the melting point of the parts to be joined. We have to note that  in welding both material to be welded have to be brought to melting temperature.

Torch Brazing

Resistance Brazing

Furnace Brazing

Dip Brazing

Dip Brazing

Silver Brazing




Soldering Process



Solder Technology

The Soldering Process

Electric Discharge Machining (EDM)



EDM removes metal by the process of controlled spark erosions.

Numerical Control of Machine Tools



Economics

NC Systems

NC Machines

Jigs and Fixtures for Productivity and Quality



Jig

Fixture

Principles of Design

Location

Clamping

Jig and Fixture Types


Template Jig

Plate Jig

Channel Jig

Box Jig

Diameter Jig

Ring Jig

Leaf Jig





Jig

Fixture

Principles of Jig and Fixture Design


1. They have to as robust as possible to withstand forces in cutting in the case of turning, milling or boring.

2. In the case of drilling jigs, jigs have to be as light as possible.

3. They have to be as simple in construction consistent with core performance.

4. The location task should be as quick as possible.

5. Clamping also has to be as quick as possible.

6. The design must provision for easy disposal of swarf and should not allow swarf to accumulate on locating points

7. Poka yoke or fool proofing features have to be incorporated (point included in the book published in 1983.)


Location


Locating Arrangements

Flat locator
Cylindrical locator
Jack Pin locator
Conical locator
Drill bush locator
Fixed or sliding V-locator


Clamping


Types of Clamps

Flat Clamp
Screw Clamp
Pivoted
Latch Clamp
Cam Clamp
Swing Plate Clamp
Wedge Clamp


Jig and Fixture Types


Template Jig

Plate Jig

Channel Jig

Box Jig

Diameter Jig

Ring Jig

Leaf Jig


Jigs and Fixtures For Machine Shops
nptelhrd
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Design and Applications of Jigs and Fixtures
nptelhrd
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In this video we take a look at a couple of simple shop built jigs and fixtures used to perform a difficult operation.
oxtoolco
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Thursday, April 18, 2019

Welding



Forge Welding

Spot Welding

Seam Welding

Projection Welding

Butt Welding

Percussion Welding

Fusion Welding

Arc Welding

Submerged Welding

Thermite Welding

Friction Welding

Ultrasonic Welding

Gas Welding

Cutting

Metal Casting Processes



Sand Casting

Centrifugal Casting

Continuous Casting

Drawing - Metal Forming

Hot Drawing

Cold Drawing

Wire Drawing

Shear Forming

Stretch Forming

Metal Forming - Forging



Smith Forging

Drop Forging

Hot Press Forging

Upset Forging

Swaging

Roll Forging

Cold Forging

Cold Heading

Riveting

Staking

Hobbing or Hubbing

Coining

Embossing

Shot Peening

Extrusion

Impact Extrusion

Cold Extrusion


Summary of the Processes

Smith Forging

Drop Forging

Hot Press Forging

Upset Forging

Swaging

Roll Forging

Cold Forging

Cold Heading

Riveting

Staking

Hobbing or Hubbing

Coining

Embossing

Shot Peening

Extrusion

Impact Extrusion

Cold Extrusion

Metal Forming - Rolling



METAL FORMING

Rolling

Hot Rolling of Metal

Cold Rolling

Seaming

Thread Rolling

General Engineering - GATE Production & IE Syllabus Section 2

Section 2: General Engineering

Engineering Materials: Structure and properties correlation;engineering materials (metals, ceramics, polymers and composites) – properties and applications; stress- strain behavior of metals and alloys;iron-carbon phase diagram, heat treatment of metals and alloys, its influence on mechanical properties.

Applied Mechanics: Engineering mechanics – equivalent force systems, free body concepts, equations of equilibrium; trusses; strength of materials – stress, strain and their relationship; failure theories, Mohr’s circle(stress), deflection of beams, bending and shear stress, Euler’s theory of columns.

Theory of Machines and Design: Analysis of planar mechanisms, cams and followers; governors and fly wheels;

Design:  design of bolted, riveted and welded joints; interference/shrink fit joints; design of shafts, keys, spur gears, belt drives, brakes and clutches; pressure vessels.

Thermal and Fluids Engineering: Fluid mechanics – fluid statics, Bernoulli’s equation, flow through pipes, equations of continuity and momentum, capillary action, contact angle and wetting;

Thermodynamics – zeroth, first and second law of thermodynamics, thermodynamic system and processes, calculation of work and heat for systems and control volumes; air standard cycles; heat transfer – basic applications of conduction, convection and radiation.


Manufacturing Processes I - GATE Production & IE Syllabus Section 3

Section 3: Manufacturing Processes I

Casting: types of casting processes and applications; patterns – types and materials; allowances; moulds and cores – materials, making, and testing; casting
techniques of cast iron, steels and nonferrous metals and alloys; analysis ofsolidification andmicrostructure development; design of gating and riser; origin of defects.

Metal Forming: Stress-strain relations in elastic and plastic deformation; concept of flow stress; hot and cold working – forging, rolling, extrusion and wire drawing; sheet metal working processes – blanking, bending and deep drawing; ideal work and slab analysis;origin of metal workingdefects.

Joining of materials: Principles of fusion welding processes(manual metal arc, MIG, TIG, plasma arc, submerged arc welding processes)–different heat sources (flame, arc, resistive, laser, electron beam), and heat transfer and associated losses, flux application, feeding of filler rod; Principles of solid state welding processes (friction, explosive welding, ultrasonic welding processes); Principles of adhesive, brazing and soldering processes; Origins of welding defects.

Powder processing: Production of metal/ceramic powders, compaction and sintering of metals and ceramic powders.

Polymers and Composites: Plastic processing – injection, compression and blow molding, extrusion, calendaring and thermoforming; molding of composites.

Manufacturing Processes II - GATE Production & IE Syllabus Section 4




Section 4: Manufacturing Processes II


Machine Tools and Machining:
Basic machine tools like centre lathe, milling machine, and drilling machine – construction and kinematics;
machining processes - turning, taper turning, thread cutting, drilling, boring, milling, gear cutting, thread production, grinding;

geometry of single point cutting tools, chip formation, cutting forces, specific cutting energy and power requirements, Merchant’s analysis;
basis of selection of machining parameters; tool materials, tool wear and tool life,

Economics of machining, thermal aspects of machining, cutting fluids,
machinability;

Jigs and fixtures – principles, applications, and design


Non-traditional Manufacturing: Principles, applications, effect of process
parameters on MRR and product quality of non-traditional machining processes –
USM, AJM, WJM, AWJM, EDM and Wire cut EDM, LBM, EBM, PAM, CHM, ECM.


Computer Integrated Manufacturing: Basic concepts of CAD – geometric modeling,
CAM – CNC and robotics – configurations, drives and controls, Group Technology
and its applications – CAPP, cellular manufacturing and FMS.

Metal Cutting and Cutting Tools



From S.B. Mathur, A Course in Mechanical Engineering (Conventional & Objective)

Types of Cutting Tools

Orthogonal cutting and Oblique Cutting

Cutting-tool Nomenclature

Cutting Forces

Tool Wear

Principal Cutting Materials



Notes

Types of Cutting Tools

Orthogonal cutting and Oblique Cutting

Cutting-tool Nomenclature

Cutting Forces

Tool Wear

Principal Cutting Materials

1. Carbon steels
2. Medium alloy steels
3. High speed steels
4. Cemented carbide
5. Stellites
6. Ceramics
7. Diamond
8. Abrasives

Thursday, May 1, 2014

Manufacturing Engineering - GATE Mechanical Engineering Portion


Engineering Materials: Structure and properties of engineering materials, heat treatment, stress-strain diagrams for engineering materials.

Metal Casting: Design of patterns, moulds and cores; solidification and cooling; riser and gating design, design considerations.

Forming: Plastic deformation and yield criteria; fundamentals of hot and cold working processes; load estimation for bulk (forging, rolling, extrusion, drawing) and sheet (shearing, deep drawing, bending) metal forming processes; principles of powder metallurgy.

Joining: Physics of welding, brazing and soldering; adhesive bonding; design considerations in welding.

Machining and Machine Tool Operations: Mechanics of machining, single and multi-point cutting tools, tool geometry and materials, tool life and wear; economics of machining; principles of non-traditional machining processes; principles of work holding, principles of design of jigs and fixtures

Metrology and Inspection: Limits, fits and tolerances; linear and angular measurements; comparators; gauge design; interferometry; form and finish measurement; alignment and testing methods; tolerance analysis in manufacturing and assembly.

Computer Integrated Manufacturing: Basic concepts of CAD/CAM and their integration tools.