The view of our Torque Sensor Production Line

A torque transducer production line is a highly precise, multi-stage manufacturing & quality-controlled workflow to build transducers that measure torque accurately, with strict process controls, calibration traceability, and compliance with ISO/industry standards. Here’s the detailed breakdown:

Core Process Flow

1. Design & Material Incoming Inspection

◦ FEA optimization for flexure geometry; select high-grade alloy steel/ceramic.

◦ Check raw materials (chemical composition, hardness, dimensional tolerance); verify certificates.

2. Precision Machining (Clean Room Class 10000)

◦ CNC turning/milling/grinding to make the torque body; surface flatness ≤0.05mm, concentricity <0.01mm.

◦ Deburring, ultrasonic cleaning, drying to remove all contaminants.

3. Strain Gauge Bonding & Circuit Assembly

◦ Automated strain gauge placement (±0.02mm accuracy), curing at controlled temp/humidity.

◦ Wire bonding, Wheatstone bridge configuration, temperature compensation resistors soldering.

◦ Potting with epoxy to protect the sensing element from moisture/vibration.

4. Electronics Integration & Initial Testing

◦ Mount signal conditioning PCB, slip ring (for rotary torque), connector, cable.

◦ Electrical test: insulation resistance, bridge resistance, no-load output, offset stability.

◦ Burn-in/aging to stabilize performance.

5. Traceable Calibration (NIST/CNAS accredited)

◦ Static calibration: step loading with precision torque standard (uncertainty ≤0.03%), record forward/reverse data, fit linear curve.

◦ Dynamic calibration (if required): sinusoidal/step torque input, check frequency response.

◦ Temperature cycling (-40°C to +85°C) to get compensation coefficients, burn into the chip. Issue calibration certificate.

6. Final Assembly, Environmental & Functional Test

◦ Housing assembly, sealing, labeling (serial number, model, rated torque).

◦ IP67/IP68 leak test, EMC/EMI test, vibration/shock test.

◦ Full range final test to confirm all parameters meet specs.

7. Packaging, Traceability & Shipping

◦ Anti-static, shock-proof packaging; attach user manual, calibration report.

◦ Digital record keeping for full batch/lot traceability.

Key Equipment List

• CNC machining centers, precision surface grinders, ultrasonic cleaners.

• Automatic strain gauge bonder, temperature chambers, potting machines.

• High-precision torque calibration bench (static/dynamic), data acquisition systems (0.01% FS accuracy).

• EMC test chambers, IP test equipment, coordinate measuring machine (CMM).

Quality Standards & Control

• ISO 9001, ISO 17025 for calibration labs; compliance with GB/T 26941, IEC 61326.

• In-process inspection at every stage (100% for critical steps like gauge bonding and calibration).

• Statistical process control (SPC) to monitor and improve process stability.

Common Types & Line Variations

• Static torque transducer: simpler, no slip ring; for stationary torque measurement.

• Rotary torque transducer: needs slip ring or telemetry for signal transmission; for rotating shafts (e.g., motor testing).

• Custom lines for miniature (mN·m range) or heavy-duty (kNm-MNm range) transducers.

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