Rectangular Container Trimming Using Long- and Short-Axis Punch Drives
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Solution Overview
Problem
Existing trimming technologies for rectangular containers are complex, require skilled operators, and result in inefficiencies due to the need for advanced cam mechanisms and gear systems, leading to increased production costs and potential for matching burrs and deformation during the trimming process.
Innovation Solution
A trimming device with independent long-axis and short-axis direction drive units allows for precise movement of a punch within a rectangular container, enabling continuous trimming without deformation and reducing the occurrence of matching burrs by forming a weak portion for controlled deformation during the trimming process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cam mechanism is used to convert longitudinal motion of a press slide into arc motion for trimming, then trimming can be performed on drawn products, but the mechanism configuration becomes complicated requiring skilled technicians for design, adjustment, and maintenance
Solution Approach 1:
The patent replaces the traditional cam mechanism with a programmable control system that converts longitudinal press slide motion into punch arc motion through software control. The control unit receives press slide position information and controls the punch to move along a predetermined arc trajectory, eliminating the need for physical cam mechanisms while achieving the same trimming function.
Solution Approach 2:
The system dynamically adjusts the punch motion trajectory based on real-time press slide position feedback. The control unit calculates the required punch position along the arc path at each moment during the pressing operation, enabling adaptive motion control without fixed mechanical constraints like cams.
2Ease of manufacture
If a cam mechanism is used for trimming, then trimming can be performed, but a large stroke length of the press is required
Solution Approach 1:
The patent introduces a second dimensional component by moving the punch not only in the vertical pressing direction but also along an arc trajectory in the horizontal plane. This multi-dimensional motion allows the trimming action to be accomplished within a shorter vertical stroke length by utilizing the arc path efficiency.
3Ease of manufacture
If gear mechanism and link mechanism are used to convert rotational motion of electric motor into circumferential motion of punch, then trimming can be performed, but the configuration becomes complicated requiring readjustment or redesign when plate thickness or shape changes
Solution Approach 1:
The patent replaces the gear and link mechanisms with a programmable control system that can be reconfigured through software. When plate thickness or shape changes, the control unit simply receives updated press slide position information and recalculates the punch trajectory, eliminating the need for mechanical readjustment or redesign.
Solution Approach 2:
The system dynamically adapts to different plate thicknesses and shapes by receiving real-time press slide position data and adjusting the punch motion trajectory accordingly. This dynamic control approach provides flexibility without requiring physical mechanism changes.
4Ease of manufacture
If a punch with inclined shape is used for cutting obliquely at the start of trimming, then trimming can be performed, but the punch must be formed complicatedly and highly accurately increasing running cost and manufacturing cost
Solution Approach 1:
The patent creates the inclined cutting action dynamically by moving the punch along a predetermined arc trajectory rather than using a statically inclined punch shape. The arc motion provides the necessary oblique cutting angle at the start of trimming while keeping the punch itself simple and easy to manufacture.
Data Source
AI summary
Provided is a trimming device configured to cut a rectangular container along a trim line, and includes: a die, which accommodates an outer periphery of the rectangular container, and is arranged along the trim line on a lower side thereof; a punch movable within a plane parallel to a bottom surface; a long-axis direction drive unit configured to move the punch along a long-axis direction of the rectangular container; a first short-axis direction drive unit, which is arranged on a proximal side of the long-axis direction drive unit, and is configured to move the punch along a short-axis direction; and a second short-axis direction drive unit, which is arranged side by side with the first short-axis direction drive unit along the long-axis direction on a distal side from the long-axis direction drive unit, and is configured to move the punch along the short-axis direction of the rectangular container.