www.ptreview.co.uk
31
'26
Written on Modified on
Double-Sheet Detection in Automated Metal Forming
Contrinex integrates smart inductive sensors with IO-Link and PocketCodr to prevent press tooling damage.
www.us.contrinex.com
Inductive double-sheet detection sensors with IO-Link integration provide continuous verification of metal sheet feeds in automated press lines, stamping cells, and material handling systems. The system prevents simultaneous feeding of overlapping sheets into forming dies, eliminating tooling damage, unbudgeted downtime, and material scrap in industrial automation applications.
Technical Challenges in Sheet Metal Processing
Automated metal forming and stamping operations require exact material thickness feeds to maintain process stability. Undetected double-sheet feeds transmit mechanical forces beyond nominal design limits into press tooling, resulting in fractured punch faces, misaligned die sets, and structural press damage.
Conventional proximity sensors encounter severe limitations in harsh metalworking environments:
- Process contaminants such as drawing oils, anti-corrosion fluids, and metallic dust alter signal return, causing false triggers or missed detections.
- Mechanical wear on contact-based sensors degrades calibration and marks sheet surfaces.
- Variations in sheet thickness across mixed-gauge batches disrupt detection thresholds.
- Airborne debris and weld spatter degrade standard polymer sensor housings.
Inductive Sensing Architecture and Structural Design
Contrinex addresses these operational challenges using non-contact inductive sensing technology combined with full-metal, stainless-steel housings. The non-contact operating principle measures electromagnetic field alterations to detect sheet thickness variations without physical contact, eliminating mechanical wear and surface abrasion on target stock.
Sensor Unit Construction
The primary detection element is constructed with a solid, one-piece stainless-steel housing engineered to withstand mechanical impact, thermal fluctuations, and continuous vibration. Specialized variants incorporate anti-spatter coatings to prevent weld spatter adhesion in automated welding cells.
System Responsibilities
Contrinex provides the sensor hardware, embedded firmware, and interface configuration tools. The physical sensor housing integrates sensing coils, internal signal processing electronics, and standardized IO-Link communication interfaces into a unified physical package.
Interface Integration and Commissioning
The sensor system connects directly to standard programmable logic controllers (PLCs) through a point-to-point IO-Link digital interface. System setup and parameter calibration are performed via the PocketCodr interface, a software-guided configuration tool that enables precise parameterization without manual programming.
Digital Communication and Processing Workflow
Operational data flows from the sensor through two primary integration paths:
Contrinex addresses these operational challenges using non-contact inductive sensing technology combined with full-metal, stainless-steel housings. The non-contact operating principle measures electromagnetic field alterations to detect sheet thickness variations without physical contact, eliminating mechanical wear and surface abrasion on target stock.
Sensor Unit Construction
The primary detection element is constructed with a solid, one-piece stainless-steel housing engineered to withstand mechanical impact, thermal fluctuations, and continuous vibration. Specialized variants incorporate anti-spatter coatings to prevent weld spatter adhesion in automated welding cells.
System Responsibilities
Contrinex provides the sensor hardware, embedded firmware, and interface configuration tools. The physical sensor housing integrates sensing coils, internal signal processing electronics, and standardized IO-Link communication interfaces into a unified physical package.
Interface Integration and Commissioning
The sensor system connects directly to standard programmable logic controllers (PLCs) through a point-to-point IO-Link digital interface. System setup and parameter calibration are performed via the PocketCodr interface, a software-guided configuration tool that enables precise parameterization without manual programming.
Digital Communication and Processing Workflow
Operational data flows from the sensor through two primary integration paths:
- IO-Link Communication: Digital signal telemetry, operating diagnostics, and signal-drift trends are transmitted continuously to higher-level automation systems.
- No-Code Parameterization: Configuration parameters are defined according to specific sheet gauges and material properties through PocketCodr recipes.
- Predictive Maintenance Diagnostics: Continuous signal tracking identifies optical or structural interference before operational failure occurs, allowing maintenance teams to intervene during scheduled service windows.
- Recipe Management: Dedicated parameter profiles are saved externally and reloaded directly into replacement units, skipping physical recalibration steps.
Operational Impact and Process Flow
Intelligent double-sheet detection is deployed upstream of the primary press feed line to verify incoming stock prior to die insertion. If an overlapping sheet condition is identified, the sensor system immediately issues a stop command to the PLC, interrupting the feed mechanism before the die cycle initiates.
This system configuration delivers specific operational performance advantages:
Intelligent double-sheet detection is deployed upstream of the primary press feed line to verify incoming stock prior to die insertion. If an overlapping sheet condition is identified, the sensor system immediately issues a stop command to the PLC, interrupting the feed mechanism before the die cycle initiates.
This system configuration delivers specific operational performance advantages:
- Equipment Protection: Direct prevention of die face fracturing, punch shearing, and press frame distortion.
- Reduced Downtime: Accelerated changeover intervals via stored parameter recipes and zero mechanical sensor wear.
- Process Reliability: Material-agnostic measurement provides stable thickness discrimination across thin foils, mid-gauge blanks, and heavy plate despite surface oil or debris.
