Sheet Metal in progress
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University of Texas, Rio Grande Valley *
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3164
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Industrial Engineering
Date
Feb 20, 2024
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MANUFACTURING PROCESSES LAB
MANE 3164 – 02
FALL 2023
LAB 4: SHEET METAL
INSTRUCTOR: ALEJRANDRO SANCHEZ
Hugo D. Candia
10/18/2023
What to report:
1.
The following figures must be included along, with their discussion:
1.
Displacement vs. Drawing force 2.
Distance from the center for unbroken coupons only
. vs. Tangential strain 3.
Distance from the center for unbroken coupons only
vs Radial strain.
4.
Distance from the center for unbroken coupons only
. vs. Thickness strain 5.
Punch speed vs. Maximum drawing force The strains for each coupon are calculated using:
r
= (dr
f - dr
i
)/ dr
i (Excel Table gives these values)
r
is the strain in the radial direction,
dr
i
is the initial length of the region in the radial direction,
dr
f
is the final length of the region in the radial direction after drawing
θ
= (r dθ
f - r dθ
i
)/ (r dθ
i
) (Excel Table gives these values)
θ
is the strain in the tangential direction
r dθ
i
is the initial distance in the tangential direction between two points,
r dθ
f
is the final distance in the tangential direction after drawing
z
= (t
f - t
i
)/ t
i
z
is the strain through the thickness,
t
i
is the initial thickness,
t
f
is the final thickness
Show the detailed calculation for the radial strain at the bent region of the coupons. Add the
distances along the bend to obtain the correct radial length for the bent region. Recalculate the
radial strain for this region manually.
2.
Major strain vs. Minor strain
at the radius at which the crack occurred only.
Remember, the major strain at a point is the larger of the two strains. Regression
analysis and T-stat for each of the figures, to make sure that your data has correlation.
Results and Analysis:
Here add the 7 graphs for this lab. for the step by step
instructions on how to make them look at the Sheet Metal PowerPoint.
Figures and regression analysis may need to explain data collected if there is a
relationship between the measured values and the sample number. However,
no relationship between data points may exist. We use figures when there are
dependent variable y and an independent variable x; a cause and effect. In
order to validate if there is a relationship the regression analysis must to be
done. You can only find existence of relationship after analysis is complete.
Remember, a T-Stat value between -1.96 & 1.96 which indicates a null
relationship.
Add graph 1 (Punch speed vs. Drawing force) and put trend lines
on it.
This
graph should include 6 small coupons and 6 big coupons, meaning 2 different
shapes/colors on the legend.
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3
4
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10
12
Punch Speed vs. Drawing Force
Big Coupon (4
Linear (Big Coupon (4)
Small Coupon (3
Linear (Small Coupon (3)
Punch Speed (in/min)
Drawing Force (lbs)
Figure 1.
Punch speed vs. Drawing force.
Here write the explanation/discussion of the graph. discuss the statistical
relationship
between punch speed and drawing force. Remember, a t-stat
value between -1.96 & 1.96 indicates a null relationship between the variables.
discuss if there is a linear relationship between the variables and why or why
not. Explain how the drawing force change having different punch speed .
Add graph 2 (Displacement vs. Drawing force) and put trend lines
on the
graph.
This graph should include 6 small coupons and 6 big coupons, meaning
2 different shapes/colors on the legend.
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0
2
4
6
8
10
12
0
2
4
6
8
10
12
f(x) = NaN x + NaN
f(x) = NaN x + NaN
Displacement vs. Drawing Force
Big Coupon (4
Linear (Big Coupon (4)
Linear (Big Coupon (4)
Linear (Big Coupon (4)
Small Coupon (3
Linear (Small Coupon (3)
Linear (Small Coupon (3)
Displacement
Drawing Force (lbs)
Figure 2. Displacement vs. Drawing force.
Here write the explanation/discussion of the graph. discuss the statistical
relationship
between displacement and drawing force. Remember, a t-stat
value between -1.96 & 1.96 indicates a null relationship between the variables.
discuss if there is a linear relationship between the variables and why or why
not. Explain how the drawing force change having different displacements .
Add graph 3 (Distance from Center vs. Tangential Strain For Small Coupons)
and put trend lines
on the graph.
Figure 3. Distance from Center vs. Tangential Strain for Small Coupons.
Here write the explanation/discussion of the graph. discuss the statistical
relationship
between distance and tangential strain. Remember, a t-stat value
between -1.96 & 1.96 indicates a null relationship between the variables.
discuss if there is a linear relationship between the variables and why or why
not. Add graph 4 (Distance from Center vs. Tangential Strain For BigCoupons)
and put trend lines
on the graph.
Figure 4. Distance from Center vs. Tangential Strain for Big Coupons
.
Here write the explanation/discussion of the graph. discuss the statistical
relationship
between distance and tangential strain. Remember, a t-stat value
between -1.96 & 1.96 indicates a null relationship between the variables.
discuss if there is a linear relationship between the variables and why or why
not. Add graph 5 (Distance from Center vs. Radial Strain For Small Coupons) and
put trend lines
on the graph.
Figure 5
. Distance from Center vs. Radial Strain for Small Coupons.
Here write the explanation/discussion of the graph. discuss the statistical
relationship
between distance and radial strain. Remember, a t-stat value
between -1.96 & 1.96 indicates a null relationship between the variables.
discuss if there is a linear relationship between the variables and why or why
not. Add graph 6 (Distance from Center vs. Radial Strain For Big Coupons) and
put trend lines
on the graph.
Figure 6
. Distance from Center vs. Radial Strain For Big Coupons.
Here write the explanation/discussion of the graph. discuss the statistical
relationship
between distance and radial strain. Remember, a t-stat value
between -1.96 & 1.96 indicates a null relationship between the variables.
discuss if there is a linear relationship between the variables and why or why
not.
Add graph 7 (Distance from Center vs. thickness strain) and put trend lines
on the graph. This graph should include 6 small coupons and 6 big coupons,
meaning 2 different shapes/colors on the legend.
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Figure 7
. Distance from Center vs. thickness strain.
Here write the explanation/discussion of the graph. discuss the statistical
relationship
between distance and thickness strain. Remember, a t-stat value
between -1.96 & 1.96 indicates a null relationship between the variables.
discuss if there is a linear relationship between the variables and why or why
not. Conclusion:
Here discuss the data and results from tables and regression analysis and
answer the following:
- Comment on the reliability of you results. -What were the important factors on the formability of the metal.
-
Explain whether the type of punch (square and round) affected or changed
the expected results.
-
Explain how the formability of the metal was affected by the different
variables (speed, displacement) during the punching process.
References:
Manufacturing Lab Manual "Sheet Metal Lab"
Appendix:
Here add data and regression analysis tables and your calculations(all data tables should be on excel).