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Cheatsheet : Manufacturing Engineering
1. Metal Casting
1.1 Solidification Time (Chvorinov's Rule)
ts = C (V/A)n
Usually n = 2
Modulus: M = V/A
Riser condition: Mriser > Mcasting
1.2 Shrinkage Types
- Liquid shrinkage
- Solidification shrinkage
- Solid shrinkage
1.3 Fluidity
- Fluidity increases with superheat
- Higher pouring temperature increases fluidity
- Smoother mould increases fluidity
- Lower viscosity improves flow
1.4 Gating and Risering
t = V / Q
Q = A √(2gh)
2. Metal Forming
2.1 True Stress and True Strain
σt = σ (1 + e)
εt = ln(1 + e)
2.2 Hollomon Equation
σ = K εn
Uniform elongation ≈ n
2.3 Rolling
Draft: Δh = h₀ - hf
Maximum draft: Δhmax = μ²R
Rolling load: F = σavg × A
Neutral point: Strip velocity = Roll velocity
2.4 Forging
F = σavg A (1 + 2μR / 3h)
- Cold working increases strength
- Cold working increases hardness
- Cold working decreases ductility
2.5 Extrusion
Extrusion ratio: r = A₀ / Af
F = A₀ σavg ln(A₀ / Af)
3. Metal Cutting
3.1 Orthogonal Cutting Geometry
Chip thickness ratio: r = t₁ / t₂
tan φ = (r cos α) / (1 - r sin α)
φ = 45° + α/2 - β/2
3.2 Forces
Shear force: Fs = Fc cos φ - Ft sin φ
Power: P = Fc V
3.3 Tool Life (Taylor Equation)
VTn = C
V Tn fm dp = C
Log form: log V + n log T = log C
3.4 MRR (Turning)
MRR = π D N f d
Specific cutting energy: u = P / MRR
4. Grinding
MRR = vw × d × b
Grinding ratio: G = Volume removed / Wheel wear
- Smaller grit improves surface finish
- Lower feed improves finish
- Higher speed improves finish
5. Welding
5.1 Heat Input
H = VI / S
5.2 Resistance Welding
H = I² R t
5.3 Power Density Ranking
Laser > Electron Beam > Plasma > Arc > Gas
5.4 Welding Defects
- Porosity
- Lack of fusion
- Undercut
- Cracks
6. Powder Metallurgy
- Powder production
- Blending
- Compaction
- Sintering
Density increases with compaction pressure.
Applications: Self-lubricating bearings, Carbide tools.
7. Non-Traditional Machining
7.1 EDM
- Works only on conductive materials
- MRR proportional to current
- Tool wear present
7.2 ECM
MRR proportional to I / ρ
- No tool wear
- No heat affected zone
7.3 USM
- Used for brittle materials
- Abrasive slurry used
7.4 AJM / WJM
- No thermal damage
- Suitable for thin materials
8. Jigs and Fixtures
3-2-1 Principle:
- 3 points - Primary plane
- 2 points - Secondary plane
- 1 point - Tertiary plane
Total constraints = 6 Degrees of Freedom
9. Metrology
9.1 Limits and Fits
Hole basis system commonly used.
Lower IT grade means tighter tolerance.
9.2 Surface Roughness
Ra = (1/L) ∫ |y| dx
9.3 Sine Bar
sin θ = h / L
10. Additive Manufacturing
- FDM
- SLA
- SLS
Advantages:
- Complex geometry
- Low material waste
The document Cheatsheet : Manufacturing Engineering is a part of the Mechanical Engineering Course Mechanical Engineering SSC JE (Technical).
All you need of Mechanical Engineering at this link: Mechanical Engineering
FAQs on Cheatsheet : Manufacturing Engineering
| 1. What are the main processes involved in metal casting? |  |
Ans. Metal casting is a manufacturing process where molten metal is poured into a mould and allowed to solidify. The main processes involved include sand casting, investment casting, die casting, and centrifugal casting. Each method varies in terms of mould material, production volume, and the complexity of the final product. Sand casting is the most common due to its versatility and cost-effectiveness, while investment casting offers high precision for complex shapes.
| 2. How does metal forming differ from metal cutting? | |
Ans. Metal forming and metal cutting are two distinct processes in manufacturing. Metal forming involves deforming a material into a desired shape without removing material, typically using methods such as forging, rolling, and stamping. In contrast, metal cutting refers to the removal of material from a workpiece to achieve the desired shape and size, commonly performed through processes like turning, milling, and drilling. Therefore, metal forming is primarily about reshaping, while metal cutting focuses on material removal.
| 3. What is the significance of metrology in manufacturing engineering? | |
Ans. Metrology is the science of measurement and plays a crucial role in manufacturing engineering by ensuring the accuracy and quality of products. It involves the use of various measuring instruments and techniques to assess dimensions, tolerances, and physical properties of materials. Accurate measurements are essential for maintaining standards, ensuring compatibility among parts, and achieving desired performance characteristics. Thus, metrology helps in minimising defects and optimising production efficiency.
| 4. Can you explain the role of jigs and fixtures in metal machining? | |
Ans. Jigs and fixtures are essential tools in metal machining that enhance production efficiency and accuracy. A jig is a device that holds the workpiece in place while guiding the tool during machining operations, ensuring consistent alignment and repeatability. A fixture, on the other hand, securely supports the workpiece but does not guide the tool. Both tools reduce setup time, improve precision, and increase productivity by allowing for quicker and more accurate machining of components.
| 5. What are the advantages of additive manufacturing compared to traditional manufacturing methods? | |
Ans. Additive manufacturing, also known as 3D printing, offers several advantages over traditional manufacturing methods. It allows for the creation of complex geometries that are often impossible to achieve with subtractive processes. This method reduces material waste since it uses only the material required for the part, leading to cost savings. Additionally, additive manufacturing enables rapid prototyping, allowing for quicker iterations and design changes. It also supports customisation and on-demand production, making it suitable for low-volume and bespoke applications.
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