Tool Signature MCQ Quiz in తెలుగు - Objective Question with Answer for Tool Signature - ముఫ్త్ [PDF] డౌన్‌లోడ్ కరెన్

Explanation:

ASA tool signature has 7 elements

American Standards System (ASA) system ⇒ Back rake angle – side rake angle – end relief angle (ERA) – side relief angle – end cutting Edge angle – side Cutting Edge Angle- Nose Radius

Calculation:

Given:

A single point cutting tool of nomenclature is given as,

0-7-7-7-15-15-1/32 

From above, the Back rake angle is 0°

Additional Information

Another tool signature used is,

Orthogonal Rake system (ORS) or International system ⇒ I (inclination angle) – αn (Normal rake angle)  - Side relief angle- end relief angle, end cutting edge angle – Approved angle – nose radius

In both the system nose radius comes in the last.

Concept:

According to ASA system, the tool signature is given as

γy, γx, αy, αx, ϕe, ϕs, r

Where 

γy – Back rake angle

γx -  Side rake angle

αy – End relief angle

αx – Side relief angle

ϕe – End cutting edge angle

ϕs – Side cutting edge angle

r – Nose radius

Comparing with given, 

Nose radius the last element in tool designation for a single-point cutting tool under the ASA system?

Explanation:

A tool has two systems:

1. American Standards System 
2. Orthogonal Rake System 

ASA tool signature has 7 elements

• American Standards System (ASA) system ⇒ Back rake angle – side rake angle – end relief angle (ERA) – side relief angle – end cutting Edge angle – side Cutting Edge Angle- Nose Radius
• Orthogonal Rake System (ORS) or International system ⇒ I (inclination angle) – αn (Normal rake angle)  - Side relief angle- end relief angle, end cutting edge angle – Approved angle – nose radius. It is also known as Old ISO system.
• In both, the system nose radius comes in the last.
• In given system 8 - 8 - 5 - 5 - 6 - 6 - 1, the following notations are indicated 
  • 8 shows Back rake angle
  • 8 shows Side rake angle
  • 5 End relief angle
  • 5 Side relief angle
  • 6 End cutting edge angle
  • 6 Side cutting edge angle
  • 1 nose radius

Concept:

Tool designation or tool signature under ASA (American Standards Association) system is given in this order:

Back rake angle (αb) – Side rake angle (αs) – End relief angle (γe) – Side relief angle (γs) – End cutting edge angle (Ce) – Side cutting edge angle (Cs) – Nose radius (R)

αb – αs – γe – γs – Ce – Cs – R

10, 10, 6, 6, 8, 8, 2

Back rake angle (αb) = 10°

Side rake angle (αs) = 10°

End relief angle (γe) = 6°

Side relief angle (γs) = 6°

End cutting edge angle (Ce) = 8°

Side cutting edge angle (Cs) = 8°

Concept:

Cutting shear plane angle (ϕ) is given by

\(\tan \phi = \frac{{r\cos α }}{{1\; - \;r\sin α }}\)

Where r is chip thickness ratio,

\(r = \frac{{Length\;of\;chip}}{{Uncut\;chip\;length}} = \frac{{Thickness\;of\;uncut}}{{Thickness\;of\;chip}}\)

Calculation:

Given: Length of chip = 100 mm, Uncut chip length = 250 mm, Rake angle, α = 20°

\(\therefore r = \frac{{100}}{{250}}=\frac{2}{5}=0.4\)

Now,

\(\tan \phi = \frac{{0.4\cos 20^\circ }}{{1 - 0.4\sin 20^\circ }}=\frac{{0.3758}}{{0.86319}}= 0.4354\)

∴ ϕ = tan^-1 (0.4354)

∴ ϕ = 23.53°

The given tool signature is ORS system

0 – 10 – 7 – 7 – 10 – 75 – 1

So in ORS system, tool nomenclature is

i - α - γ – γ₁ – c_e - λ – R

∴ α = 10°              \(\beta = {\tan ^{ - 1}}\left( \mu \right) = {\tan ^{ - 1}}\left( {0.7} \right) = 35^\circ\)

λ = 75°

Here shear angle can be found by applying Merchant’s Theory

\(\phi = \frac{\pi }{4} + \frac{\alpha }{2} - \frac{\beta }{2} = 45 + \frac{{10}}{2} - \frac{{35}}{2}\)

Concept:

Tool designation or tool signature under ASA (American Standards Association) system is given in this order:

Back rake angle (αb) – Side rake angle (αs) – End relief angle (γe) – Side relief angle (γs) – End cutting edge angle (Ce) – Side cutting edge angle (Cs) – Nose radius (R)

αb – αs – γe – γs – Ce – Cs – R

8°, 14°, 6°, 6°, 6°, 15°, 4 

Back rake angle (αb) = 8°

Side rake angle (αs) = 14°

End relief angle (γe) = 6°

Side relief angle (γs) = 6°

End cutting edge angle (Ce) = 6°

Side cutting edge angle (Cs) = 15°

Explanation:

Tool designation or tool signature under ASA (American Standards Association) system is given in this order:

Back rake angle (αb) – Side rake angle (αs) – End relief angle (γe) – Side relief angle (γs) – End cutting edge angle (Ce) – Side cutting edge angle (Cs) – Nose radius (R) inch

αb – αs – γe – γs – Ce – Cs – R

Given tool is designated as, 0° - 10° - 6° - 6° - 8° - 75° - 1

Back rake angle (αb) = 0°

Side rake angle (αs) = 10°

End relief angle (γe) = 6°

Side relief angle (γs) = 6°

End cutting edge angle (Ce) = 8°

Side cutting edge angle (Cs) = 75°

Nose radius (R) = 1 inch

Additional Information

Orthogonal Rake System (ORS): 

i (inclination angle) - αn (Normal rake angle) - Side relief angle - end relief angle, end cutting edge angle - approach angle - nose radius (r) mm.

Concept:

For a sharp turning tool,

Peak to valley roughness (h) \(h=\frac{f}{\tan {{C}_{s}}+cot~{{C}_{e}}}\)

Center line average roughness (CLA) \(CLA=\frac{f}{4\left( \tan {{C}_{s}}+cot~{{C}_{e}} \right)}\)

Calculation:

Given data,

f = 0.1 mm/rev, C_S = 45°, C_e = 10°

\(\Rightarrow CLA=\frac{0.1}{4\left( \tan 45{}^\circ +cot~10{}^\circ \right)}\)

CLA = 0.0037474 mm = 3.7474 μm

Key points:

Explanation:

Tool designation or tool signature under ASA (American Standards Association) system is given in this order:

Back rake angle (αb) – Side rake angle (αs) – End relief angle (γe) – Side relief angle (γs) – End cutting edge angle (Ce) – Side cutting edge angle (Cs) – Nose radius (R)

αb – αs – γe – γs – Ce – Cs – R

Given tool is designated as, 10° - 8° - 6° - 5° - 10° - 20° - 2

Back rake angle (αb) = 10°

Side rake angle (αs) = 8°

End relief angle (γe) = 6°

Side relief angle (γs) = 5°

End cutting edge angle (Ce) = 10°

Side cutting edge angle (Cs) = 20°

Nose radius (R) = 2 inch

Additional Information

Orthogonal Rake System (ORS): 

• i (inclination angle) - αn (Normal rake angle) - Side relief angle - end relief angle, end cutting edge angle - approach angle - nose radius (r).