IEEM 215 covers traditional manufacturing processes including casting, forming, and sheet metal processing. Casting methods like sand casting and die casting are discussed along with guidelines for casting design to prevent defects. Forming processes include rolling, forging, and extrusion to shape metals. Sheet metal processes involve cutting, punching, bending, and deep drawing of sheet stock to form parts. The notes provide examples of each process and considerations for planning the sequencing of operations.
Introduction to casting, Major classifications of casting, Casting terminology, Characteristics of molding sand, Constituents of foundry sand, Patterns and their types, Cores and types of cores, Gating system, Types of gates, Solidification, Riser system, Types of riser, Types of allowances, Directional Solidification, Defects in casting, Riser design(Chvorinov's rules), Advanced casting techniques:Shell molding, Permanent mould casting, Vacuum die casting, Low pressure die casting, Continuous casting, Squeeze casting, Slush casting, Vacuum casting, Die Casting, Centrifugal casting, Investment casting
Introduction to casting, Major classifications of casting, Casting terminology, Characteristics of molding sand, Constituents of foundry sand, Patterns and their types, Cores and types of cores, Gating system, Types of gates, Solidification, Riser system, Types of riser, Types of allowances, Directional Solidification, Defects in casting, Riser design(Chvorinov's rules), Advanced casting techniques:Shell molding, Permanent mould casting, Vacuum die casting, Low pressure die casting, Continuous casting, Squeeze casting, Slush casting, Vacuum casting, Die Casting, Centrifugal casting, Investment casting
Introduction to Manufacturing Processes and their Applications (Casting, Forging, Sheet metal working and Metal joining processes), Description of Casting process: Sand casting(Cope&Drag). Sheet metal Forming,(shearing, bending, drawing), Forging (Hot working and cold working comparison) ,Electric Arc welding, Comparison of Welding, Soldering, Brazing
Introduction to casting, Major classifications of casting, Casting terminology, Characteristics of molding sand, Constituents of foundry sand, Patterns and their types, Cores and types of cores, Gating system, Types of gates, Solidification, Riser system, Types of riser, Types of allowances, Directional Solidification, Defects in casting, Riser design(Chvorinov's rules), Advanced casting techniques:Shell molding, Permanent mould casting, Vacuum die casting, Low pressure die casting, Continuous casting, Squeeze casting, Slush casting, Vacuum casting, Die Casting, Centrifugal casting, Investment casting
Introduction to casting, Major classifications of casting, Casting terminology, Characteristics of molding sand, Constituents of foundry sand, Patterns and their types, Cores and types of cores, Gating system, Types of gates, Solidification, Riser system, Types of riser, Types of allowances, Directional Solidification, Defects in casting, Riser design(Chvorinov's rules), Advanced casting techniques:Shell molding, Permanent mould casting, Vacuum die casting, Low pressure die casting, Continuous casting, Squeeze casting, Slush casting, Vacuum casting, Die Casting, Centrifugal casting, Investment casting
Introduction to Manufacturing Processes and their Applications (Casting, Forging, Sheet metal working and Metal joining processes), Description of Casting process: Sand casting(Cope&Drag). Sheet metal Forming,(shearing, bending, drawing), Forging (Hot working and cold working comparison) ,Electric Arc welding, Comparison of Welding, Soldering, Brazing
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
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Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
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3. Casting
Refractory mold pour liquid metal solidify, remove finish
• VERSATILE: complex geometry, internal cavities, hollow sections
• VERSATILE: small (~10 grams) very large parts (~1000 Kg)
• ECONOMICAL: little wastage (extra metal is re-used)
• ISOTROPIC: cast parts have same properties along all directions
4. Different Casting Processes
Process Advantages Disadvantages Examples
Sand many metals, sizes, shapes, cheap poor finish & tolerance engine blocks,
cylinder heads
Shell mold better accuracy, finish, higher
production rate
limited part size connecting rods, gear
housings
Expendable
pattern
Wide range of metals, sizes,
shapes
patterns have low
strength
cylinder heads, brake
components
Plaster mold complex shapes, good surface
finish
non-ferrous metals, low
production rate
prototypes of
mechanical parts
Ceramic mold complex shapes, high accuracy,
good finish
small sizes impellers, injection
mold tooling
Investment complex shapes, excellent finish small parts, expensive jewellery
Permanent
mold
good finish, low porosity, high
production rate
Costly mold, simpler
shapes only
gears, gear housings
Die Excellent dimensional accuracy,
high production rate
costly dies, small parts,
non-ferrous metals
gears, camera bodies,
car wheels
Centrifugal Large cylindrical parts, good
quality
Expensive, few shapes pipes, boilers,
flywheels
7. Sand Casting Considerations
(a) How do we make the pattern?
[cut, carve, machine]
(b) Why is the pattern not exactly identical to the part shape?
- pattern outer surfaces; (inner surfaces: core)
- shrinkage, post-processing
(c) parting line
- how to determine?
8. Sand Casting Considerations..
(d) taper
- do we need it ?
Mold
cavity
chaplet
Mold
cavity
chaplet
(e) core prints, chaplets
- hold the core in position
- chaplet is metal (why?)
(f) cut-off, finishing
9. Shell mold casting - metal, 2-piece pattern, 175°C-370°C
- coated with a lubricant (silicone)
- mixture of sand, thermoset resin/epoxy
- cure (baking)
- remove patterns, join half-shells mold
- pour metal
- solidify (cooling)
- break shell part
10. Expendable Mold Casting
- Styrofoam pattern
- dipped in refractory slurry dried
- sand (support)
- pour liquid metal
- foam evaporates, metal fills the shell
- cool, solidify
- break shell part
polystyrene
pattern
pattern
support
sand
molten
metal
polystyrene
burns;
gas escapespolystyrene
pattern
pattern
support
sand
molten
metal
polystyrene
burns;
gas escapes
11. Plaster-mold, Ceramic-mold casting
Plaster-mold slurry: plaster of paris (CaSO4
), talc, silica flour
Ceramic-mold slurry: silica, powdered Zircon (ZrSiO4)
- The slurry forms a shell over the pattern
- Dried in a low temperature oven
- Remove pattern
- Backed by clay (strength), baked (burn-off volatiles)
- cast the metal
- break mold part
Plaster-mold: good finish (Why ?)
plaster: low conductivity => low warpage, residual stress
low mp metal (Zn, Al, Cu, Mg)
Ceramic-mold: good finish
high mp metals (steel, …) => impeller blades, turbines, …
12. Investment casting (lost wax casting)
(a) Wax pattern
(injection molding)
(b) Multiple patterns
assembled to wax sprue
(c) Shell built
immerse into ceramic slurry
immerse into fine sand
(few layers)
(d) dry ceramic
melt out the wax
fire ceramic (burn wax)
(e) Pour molten metal (gravity)
cool, solidify
[Hollow casting:
pouring excess metal before solidification
(f) Break ceramic shell
(vibration or water blasting)
(g) Cut off parts
(high-speed friction saw)
finishing (polish)
13. Vacuum casting
Similar to investment casting, except: fill mold by reverse gravity
Easier to make hollow casting: early pour out
14. Permanent mold casting
MOLD: made of metal (cast iron, steel, refractory alloys)
CORE: (hollow parts)
- metal: core can be extracted from the part
- sand-bonded: core must be destroyed to remove
Mold-surface: coated with refractory material
- Spray with lubricant (graphite, silica)
- improve flow, increase life
- good tolerance, good surface finish
- low mp metals (Cu, Bronze, Al, Mg)
15. Die casting
- a type of permanent mold casting
- common uses: components for
rice cookers, stoves, fans, washing-, drying machines,
fridges, motors, toys, hand-tools, car wheels, …
HOT CHAMBER: (low mp e.g. Zn, Pb; non-alloying)
(i) die is closed, gooseneck cylinder is filled with molten metal
(ii) plunger pushes molten metal through gooseneck into cavity
(iii) metal is held under pressure until it solidifies
(iv) die opens, cores retracted; plunger returns
(v) ejector pins push casting out of ejector die
COLD CHAMBER: (high mp e.g. Cu, Al)
(i) die closed, molten metal is ladled into cylinder
(ii) plunger pushes molten metal into die cavity
(iii) metal is held under high pressure until it solidifies
(iv) die opens, plunger pushes solidified slug from the cylinder
(v) cores retracted
(iv) ejector pins push casting off ejector die
16. Centrifugal casting
- permanent mold
- rotated about its axis at 300 ~ 3000 rpm
- molten metal is poured
- Surface finish: better along outer diameter than inner,
- Impurities, inclusions, closer to the inner diameter (why ?)
26. Forming
Any process that changes the shape of a raw stock
without changing its phase
Example products:
Al/Steel frame of doors and windows, coins, springs,
Elevator doors, cables and wires, sheet-metal, sheet-metal parts…
29. Rolling Basics
Sheets are rolled in multiple stages (why ?)
Vo
Vfto
tf
Vo
Vfto
tf
Vo
Vfto
tf
Vo
Vfto
tf
thread rolling machine
stationary die
rolling die
thread rolling machine
stationary die
rolling die
Reciprocating flat thread-rolling diesReciprocating flat thread-rolling dies
Screw manufacture:
30. Forging
[Heated] metal is beaten with a heavy hammer to give it the required shape
Hot forging,
open-die
31. Stages in Open-Die Forging
(a) forge hot billet to max diameter
(b) “fuller: tool to mark step-locations
(c) forge right side
(d) reverse part, forge left side
(e) finish (dimension control)
[source:www.scotforge.com]
33. Quality of forged parts
Stronger/tougher than cast/machined parts of same material
Surface finish/Dimensional control:
Better than casting (typically)
[source:www.scotforge.com]
34. Extrusion
Metal forced/squeezed out through a hole (die)
Typical use: ductile metals (Cu, Steel, Al, Mg), Plastics, Rubbers
Common products:
Al frames of white-boards, doors, windows, …
[source:www.magnode.com]
36. Drawing
Commonly used to make wires from round bars
stock (bar)
F (pulling force)
wire
diestock (bar)
F (pulling force)
wire
die
Similar to extrusion, except: pulling force is applied
44. Sheet Metal Processes
Raw material: sheets of metal, rectangular, large
Raw material Processing: Rolling (anisotropic properties)
Processes:
Shearing
Punching
Bending
Deep drawing
45. Shearing
A large scissors action, cutting the sheet along a straight line
Main use: to cut large sheet into smaller sizes for making parts.
46. Punching
Cutting tool is a round/rectangular punch,
that goes through a hole, or die of same shape
F ∝ t X edge-length of punch X shear strength
Punch
die
sheet
crack
(failure in shear)
clearance
die
piece cut away, or slug
t
F ∝ t X edge-length of punch X shear strength
Punch
die
sheet
crack
(failure in shear)
clearance
die
piece cut away, or slug
t
47. Punching
Main uses: cutting holes in sheets; cutting sheet to required shape
typical punched part
nesting of parts
Exercise: how to determine optimal nesting?
48. Bending
Body of Olympus E-300 camera
component with multiple bending operations
[image source: dpreview.com]
component with punching,
bending, drawing operations
50. Sheet metal bending
Planning problem: what is the sequence in which we do the bending operations?
Avoid: part-tool, part-part, part-machine interference
51. Bending mechanics
R = Bend radius
Neutral axis
α
L = Bend length
This section is
under extension
This section is
in compression
Bend allowance, Lb = α(R + kT)
T = Sheet thickness
R = Bend radius
Neutral axis
α
L = Bend length
This section is
under extension
This section is
in compression
Bend allowance, Lb = α(R + kT)
T = Sheet thickness
Bending Planning what is the length of blank we must use?
Ideal case: k = 0.5 Real cases: k = 0.33 ( R < 2T) ~~ k = 0.5 (R > 2T)
52. Bending: cracking, anisotropic effects, Poisson effect
Bending plastic deformation
Bending disallow failure (cracking) limits on corner radius: bend radius ≥ 3T
Engineering strain in bending = e = 1/( 1 + 2R/T)
effect of anisotropic stock Poisson effect
Exercise: how does anisotropic behavior affect planning?
54. Deep Drawing
die die die die die
punch punch punch punch
blank
part
blank holder
(a) (b) (c) (d) (e)
Examples of deep drawn parts
die die die die die
punch punch punch punch
blank
part
blank holder
(a) (b) (c) (d) (e)
die die die die die
punch punch punch punch
blank
part
blank holder
(a) (b) (c) (d) (e)
Examples of deep drawn parts
Tooling: similar to punching operation,
Mechanics: similar to bending operation
Common applications: cooking pots, containers, …
55. Sheet metal parts with combination of operations
Body of Olympus E-300 camera
component with multiple bending operations
[image source: dpreview.com]
component with punching,
bending, drawing operations
56. These notes covered Casting, Forming and Sheet metal processing
Case study on planning of operations (bending)
Further reading: Chapters 10-16, Kalpakjian & Schmid
Summary