theory of machines: shaper feed mechanism
TRANSCRIPT
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Shaper Feed Mechanism
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Contents
• General Description.• 3D overview for mechanism.• Motion Description.• Data Analysis.• Application of mechanism in industry.• Conclusion.
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General Description • It’s a machine that can make
slots and grooves using a thin cutting tool
• The linear cutting motion is provided by the “Quick-Return Mechanism“.while the feed motion is supplied by the mechanism illustrated in this report "The shaper feed Mechanism".
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General Description
• The shaping machine is used to machine flat metal surfaces especially where a large amount of metal has to be removed.
• It can cut curves, angles and many other shapes. It is a popular machine in a workshop because its movement is very simple although it can produce a variety of work.
• When high accuracy and surface quality are required, shaping is followed by other techniques, e.g. grinding or scraping.
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Components
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3D Overview of the mechanism
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3D Overview of the mechanism
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Solidworks
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Degrees of Freedom
Note That:
1 , 2 , 3 , 4 represent no. of links
a, b , c , d represent no. of joints
According to formula :
M = 3(n-1)-2j1-j2.
N=4 j1=4 j2=0
D.O.F = 1
Notice: Four bar mechanism.
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Position Analysis
Extreme Right Position = L-R
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Position Analysis
Extreme Left Position = L+R
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Velocity Analysis
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Velocity Analysis
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Velocity Analysis• In our case:
S= 27 mm• R= 77 mm• = 27÷77 = 0.35 rad = 20⁰Ө• Assume P= 2mm• S (feed)= 20×2/360 = 0.11mm/rev
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Velocity Analysis• How to increase/ decrease the feed?
• By changing the length L (the overset distance of the link A), the ratchet stroke will change and therefore the number of teeth moving per stroke.
• i.e By increasing the ratchet stroke, the ratchet will move 2 teeth instead of one per stroke which results in increasing the feed rate.
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Velocity Analysis• How to increase/ decrease the feed?
To calculate the feed rate in (mm/min) we will use the following formula: F=S*N ,where F is feed rate in mm/min.
S is feed rate in mm/rev.
N is the input velocity obtained from the gear box in rpm.
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Matlab Data
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Applications in Industry
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Conclusion
• We can conclude that the feed mechanism is an essential mechanism in any shaper machine.
• One main feature is that it links the motor rotation which feeds the quick return mechanism with the table feed.
• We could change the feed independently by changing the offset distance of the link.
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Thanks for your attention