Cam Design 电子凸轮 设计 案例资料
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Copyright © 2011 Rockwell Automation, Inc. All rights reserved.
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Mechanical CAMs and related Systems
Copyright © 2011 Rockwell Automation, Inc. All rights reserved.
1. Definition of Mechanical CAMs & Related Systems 2. CAM Design – Math analysis 3. Prototyping CAM using RSLogix5000 4. Use of the RSLogix5000 Toolset
Copyright © 2011 Rockwell Automation, Inc. All rights reserved.
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Topic Lists
1. Definition of Mechanical CAMs & Related Systems 2. CAM Design – Math analysis 3. Prototyping CAM using RSLogix5000 4. Use of the RSLogix5000 Toolset
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Definition of Mechanical CAMs
▪ Mechanical CAM translates a primary unidirectional motion into either reciprocating (returning) or oscillating type of motion
Copyright © 2011 Rockwell Automation, Inc. All rights reserved.
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Topic Lists
1. Definition of Mechanical CAMs & Related Systems 2. CAM Design – Math analysis 3. Prototyping CAM using RSLogix5000 4. Use of the RSLogix5000 Toolset
Copyright © 2011 Rockwell Automation, Inc. All rights reserved.
Copyright © 2011 Rockwell Automation, Inc. All rights reserved.
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Need for Electronic CAMs
▪ In today’s world mechanical CAMs have been largely replaced by Servo Motors due to the following reasons
▪ CAMs can be very complex (Single stage vs. multistage) and contain additional mechanical systems (linkages, …)
▪ CAMs can be designed in a 3D fashion to allow changing shape with velocity – Camshaft moves to alter the shape of movement progressively
• A purely mechanical CAM system was typically sized with one large motor with high inertia to overcome the unbalanced reflected load generated by the CAM shaft.
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Rockwell Automation
Mid Range Competency Development
Cam Design
OEM Team
Copyright © 2011 Rockwell Automation, Inc. All rights reserved.
Topic Lists
• The science behind CAM Design gradually improved to work with a secondary source of motion to provide optimized synchronization and dynamics.
• In mechanical systems the most crucial parameter on top of displacement (distance from center) was to generate jerk-limited (smooth) motion, while for Servo Motors Velocity, Acceleration (current) and jerk-limitation are all equally important.
▪ CAMs are typically repeatable and allow the designer to share geared, reciprocating and oscillating movements in the same system.
▪ CAMs can be flexible to an extent by allowing more than one secondary shape to be used alternatively in the same stage.
• 20-15 years ago – Flexibility • 12-8 years ago – Price • 6-4 years ago – Accuracy • 2 years ago and ongoing – Dynamics
▪ Design Cycles changed with these developments