design and calculation of whitworth mechanism
TRANSCRIPT
Design and calculation of Whitworth mechanism
Production Machines I
Liberec, 15. 1. 2013
Petr Zelený
Production Machines I – Design and calculation of Whitworth mechanism
Mechanism animation
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Production Machines I – Design and calculation of Whitworth mechanism
Progress of linear motion speed of slider
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Production Machines I – Design and calculation of Whitworth mechanism
Video demonstrations of the mechanism application
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Production Machines I – Design and calculation of Whitworth mechanism
Video demonstrations of the mechanism application
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Production Machines I – Design and calculation of Whitworth mechanism
Summary of findings from videos and animation
Group of mechanisms:
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Production Machines I – Design and calculation of Whitworth mechanism
Summary of findings from videos and animation
Group of mechanisms:
• transfer rotary motion to reciprocating.
Application in the field of machine tools:
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Production Machines I – Design and calculation of Whitworth mechanism
Summary of findings from videos and animation
Group of mechanisms:
• transfer rotary motion to reciprocating.
Application in the field of machine tools:
• for horizontal Shaping Machines.
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Production Machines I – Design and calculation of Whitworth mechanism
Mechanism description
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Production Machines I – Design and calculation of Whitworth mechanism
Mechanism description
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crank / lever
Production Machines I – Design and calculation of Whitworth mechanism
Mechanism description
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slotted link crank / lever
Production Machines I – Design and calculation of Whitworth mechanism
Mechanism description
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slider / pull rod
slotted link crank / lever
Production Machines I – Design and calculation of Whitworth mechanism
Mechanism description
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slotted link crank / lever
stone / pin
slider / pull rod
Production Machines I – Design and calculation of Whitworth mechanism
Mechanism scheme
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Production Machines I – Design and calculation of Whitworth mechanism
Mechanism calculation
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Task:
Given:
• vs= 50 m/min; Fs=1000 N;
• R = 700 mm; r = 150 mm;
• e = 250 mm;
Calculate:
• revolutions n,
• torque MK,
• motor power P,
• max. reverse speed vR,
• main time tm,
• secondary time ts.
Production Machines I – Design and calculation of Whitworth mechanism
Mechanism calculation
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Task:
Given:
• vs= 50 m/min; Fs=1000 N;
• R = 700 mm; r = 150 mm;
• e = 250 mm;
Calculate:
• revolutions n,
• torque MK,
• motor power P,
• max. reverse speed vR,
• main time tm,
• secondary time ts.
Production Machines I – Design and calculation of Whitworth mechanism
Mechanism calculation
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Task:
Given:
• vs= 50 m/min; Fs=1000 N;
• R = 700 mm; r = 150 mm;
• e = 250 mm;
Calculate:
• revolutions n,
• torque MK,
• motor power P,
• max. reverse speed vR,
• main time tm,
• secondary time ts.
Results:
n = 30,3 rpm ; MK= 262,5 N m; P = 832,9 W;
vR= 200 m/min; tm= 1,4 s; ts= 0,58 s
Production Machines I – Design and calculation of Whitworth mechanism
Summary
We are at the end of the exercise, do you know
following?
• Include Whitworth mechanism to group of
mechanisms!
• Give an example of using Whitworth mechanism for
machine tool!
• Draw scheme of Whitworth mechanism!
• Describe Whitworth mechanism and its parts!
• Calculate parameters of Whitworth mechanism!
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Production Machines I – Design and calculation of Whitworth mechanism
New example (homework)
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Given:
• P = 1 kW; n = 31 rpm; R = 800 mm; r = 170 mm; e = 300 mm;
Calculate:
• torque MK,
• force on the slider Fs,
• the slide speed in the forward direction vs ,
• max. reverse speed vR,
• main time tm,
• secondary time ts.
Results:
MK= 308 N m; Fs = 1064,4 N; vs = 56,4 m/min; vR= 203,8 m/min;
tm= 1,34 s; ts= 0,6 s