Eccentric Workpiece Machining Device with Active Pressure Mechanism
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Solution Overview
Problem
Existing devices for fine machining of circumferential workpiece surfaces, such as crankshafts and camshafts, require lengthy machining times due to inefficient movement trajectories and passive following of the workpiece surface, leading to significant idle times and increased processing time.
Innovation Solution
A device with a drive unit that actively controls the position of the pressure mechanism along crosswise and angled movement trajectories, allowing for precise positioning and reduced idle times by moving the pressure mechanism independently of the workpiece's circular trajectory, enabling faster adaptation to different workpiece dimensions and positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pressure mechanism passively follows the circular trajectory of the workpiece surface, then the device structure is simple, but the machining time is excessively long
Solution Approach 1:
The pressure mechanism is transformed from a passive follower to an actively controlled system. The active section of the pressure mechanism is driven by drive means to move along predetermined trajectories (including circular, diametral, and chordal paths), enabling dynamic positioning that actively reduces idle times between machining operations while maintaining manageable device complexity through structured control mechanisms.
2Device complexity
If the pressure mechanism passively follows the workpiece movement, then the control system is simple, but idle times between machining operations are excessive
Solution Approach 1:
The active section of the pressure mechanism is positioned in advance along predetermined trajectories using drive means. This preliminary positioning allows the tool to be ready at the optimal location before the workpiece surface arrives, eliminating idle waiting time. The system pre-moves the active section along circular, diametral, or chordal trajectories to anticipate and prepare for the next machining position.
Solution Approach 2:
The drive means continuously moves the active section of the pressure mechanism along predetermined trajectories during the entire machining cycle. This continuous active movement ensures that the tool is always positioned optimally relative to the workpiece surface, eliminating idle periods where the tool would otherwise wait passively, thereby maintaining continuous useful machining action.
3Manufacturing precision
If multiple bearing surfaces are machined consecutively, then the surface quality meets high demands, but the total machining time increases significantly
Solution Approach 1:
The pressure mechanism employs active drive means to dynamically reposition the active section between different bearing surfaces. This dynamic capability allows rapid transition between multiple machining locations on the workpiece, maintaining high surface quality through precise control while significantly reducing the time penalty associated with machining multiple surfaces consecutively.
Data Source
AI summary
A device for the fine machining of a circumferential workpiece surface arranged eccentrically relative to an axis of a workpiece. The device comprises a pressure mechanism configured to press a fine-machining tool against the circumferential workpiece surface. The device also includes a drive unit configured to drive an active section of the pressure mechanism via a first drive and a second drive. The first drive drives the active section in a movement plane that runs crosswise to the workpiece axis along a first movement trajectory. The second drive drives the active section along a second movement trajectory that is at an angle to the first movement trajectory.