Blanking Assembly With Deflecting Shoulder for Scratch Reduction
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Solution Overview
Problem
Punching tools for producing flat products like ID cards often result in jamming and scratching due to freely falling punched parts, leading to machine downtime and production rejects.
Innovation Solution
A punching assembly with a shoulder extending into the through-hole to deflect the falling punched piece, a widening through-opening, and a movable ejector to ensure precise placement on the conveyor belt, combined with a hold-down device to secure the substrate during punching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If punched parts fall freely through the through-hole onto the conveyor belt, then the punching process is simple, but jamming and scratching of punched cards occur leading to machine downtime
Solution Approach 1:
A shoulder is introduced as an intermediary element inside the through-hole to mediate the interaction between the falling punched card and the conveyor belt. The shoulder deflects the punched card at a predetermined angle, preventing direct impact with the conveyor belt and eliminating scratching and jamming while maintaining continuous production.
2Ease of manufacture
If the through-hole is straight and narrow, then the die structure is simple, but punched cards may get wedged or scratched during descent
Solution Approach 1:
The should er is designed with a rounded edge instead of a sharp corner. This curvature prevents the punched card from catching on the shoulder during deflection, eliminating scratching while maintaining the simplicity of the die structure. The rounded geometry smoothly guides the card through the deflection.
3Ease of operation
If the shoulder extends too far into the through-hole, then deflection is effective, but the punched product may get caught on the shoulder
Solution Approach 1:
The shoulder extension depth is optimized to a specific parameter range: extending into the through-hole by 0.5mm to 2.5mm (up to 25% of the through-hole length). This parameter optimization ensures effective deflection at a predetermined angle while preventing the punched product from catching on the shoulder, balancing both requirements.
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
Prevents waste production and jamming, reduces scrap rates, and ensures reliable forwarding of punched parts without damage, minimizing machine downtime.
Implementation Method 1
a punching tool (17) with a punch (1) adjustable along a longitudinal axis and a die (2) for punching out a punched piece (10) having a through-opening (7) for the passage of the punched piece (10). The punching assembly (16) also features a drivable conveyor belt (8) arranged below the through-opening (7) of the die (2) in the direction of fall.
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a stamping arrangement (16) comprising a stamping tool (17) for stamping out a blank (10), which includes a punch (1) adjustable along a longitudinal axis and a die (2), wherein the die (2) has a through-opening (7) for the passage of the blank (10), and a driven conveyor belt (8) which is arranged in the direction of fall below the through-opening (7) of the die (2). A shoulder (14) projects into the through-opening (7) to deflect a falling blank (10).