Dual Cam Bending Machine Shape Accuracy
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Solution Overview
Problem
Existing processing machines for bending operations face challenges in achieving high shape accuracy due to insufficient plastic deformation and shape degradation at large pressure angles, and increasing machine size to compensate for reduced pressure angles.
Innovation Solution
A processing machine with a dual cam system, where a first cam device with a higher pressure angle is used for initial deformation, followed by a second cam device with a smaller pressure angle for surface pressing, allowing for increased load application to fix the shape, thereby enhancing accuracy and reducing machine size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pressure angle of the inclined surfaces is reduced to increase the load applied from the punches to the workpiece, then the manufacturing precision improves, but the device complexity increases because the travel distance of the pressure cam block increases
Solution Approach 1:
The patent divides the single cam device into two separate cam devices: a first cam device with a larger pressure angle for initial deformation, and a second cam device with a smaller pressure angle for final shaping. This segmentation allows each cam to be optimized for its specific function, achieving high precision without requiring excessive travel distance that would increase machine size.
Solution Approach 2:
The first cam device performs preliminary deformation of the workpiece before the second cam device performs the final shaping. This preliminary action prepares the workpiece in advance, allowing the second cam to apply sufficient load with a smaller pressure angle for high precision without requiring a longer travel distance.
2Device complexity
If the pressure angle is excessively large, then the device complexity is reduced, but the manufacturing precision deteriorates because the plastic deformation of the workpiece is insufficient and the workpiece slightly returns its original shape
Solution Approach 1:
By segmenting the deformation process into two stages with two separate cam devices, the patent avoids the need to use a single cam with an excessively large pressure angle. The first cam can use a larger pressure angle for initial deformation, while the second cam uses a smaller pressure angle for precision shaping, thereby maintaining both compact machine size and high shape accuracy.
Solution Approach 2:
The patent ensures continuous deformation action through two sequential cam devices. The first cam device continues the deformation process initiated by the second cam device, ensuring that plastic deformation is sufficient and the workpiece does not return to its original shape, thereby maintaining manufacturing precision without requiring an excessively large pressure angle.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The dual cam system enables high-accuracy bending operations by ensuring sufficient plastic deformation and shape fixation, while maintaining a compact machine design.
Implementation Method 1
a first cam device that moves the punch toward the die for deforming the workpiece when being actuated by movement of the slide member; a second cam device that moves the punch for pressing a surface of the workpiece
Implementation Method 2
the plastic deformation of the workpiece is insufficient, and the workpiece slightly returns its original shape
Data Source
AI summary
A processing machine for performing a bending operation on a workpiece includes a die, a punch movable in a first direction for pressing the workpiece against the die, a slide member movable in a second direction perpendicular to the first direction, a first cam device that moves the punch toward the die for deforming the workpiece when being actuated by movement of the slide member, a second cam device that moves the punch for pressing a surface of the workpiece when being actuated by movement of the slide member. The pressure angle of the second cam device is smaller than a pressure angle of the first cam device. The processing machine further includes a drive member configured to move the slide member such that the second cam device is actuated after the first cam device is actuated.