In precision manufacturing industries such as automotive assembly and 3C electronics, the quality of screw tightening directly determines product reliability. However, inconsistencies like thread precision deviations and varying surface roughness often lead to defects such as over-tightening or floating screws under single torque control. In response, the torque and angle composite control strategy has become a key solution, with Danikor’s intelligent electric screwdriver offering a mature implementation model for the industry.

1. Tightening Pain Points Caused by Poor Part Consistency

Under traditional single torque control, part variations often cause two typical issues:

• Over-tightening: When the threaded hole is too shallow or the thread is too smooth, the screw may continue to rotate due to inertia even after reaching the target torque, causing over-insertion and damaging the internal thread.

• Floating screw: If the hole is too deep or the thread is rough, the screw may reach the target angle but still lack sufficient torque, resulting in a loose connection that compromises structural integrity.

These issues not only reduce production yield but also pose safety risks—especially in critical assemblies like automotive chassis and power battery packs.

2. Core Logic of the Composite Control Strategy

The torque and angle composite strategy uses a dual-parameter “AND” logic to dynamically control the tightening process. It operates in two main scenarios:

• Torque-first, angle-follow (to prevent over-tightening)
  The screwdriver continues to rotate after reaching the target torque until a preset angle is achieved. If torque exceeds the upper limit during this phase, the system immediately flags the result as NG (No Good) and triggers an alarm to prevent over-tightening.

• Angle-first, torque-compensate (to prevent floating screws)
  If the screwdriver reaches the target angle first but the torque is still below the required threshold, it continues tightening until the torque meets the specification—solving the “in place but not tight” problem.

The key to this logic lies in simultaneous monitoring of both parameters and real-time response, which requires high-precision sensors and intelligent algorithms.

3. Danikor’s Technical Implementation and Product Advantages

As a brand deeply invested in automated assembly, Danikor’s intelligent electric screwdriver achieves this strategy through three core technical strengths:

• High-precision sensing: Equipped with high-accuracy torque sensors, it achieves a full-range torque precision of 6σ ±5%, ensuring real-time dual-parameter data collection without deviation.

• Flexible control mechanisms: Supports multiple tightening programs, adaptable to a wide range of applications—from micro screws to 480 Nm high-torque scenarios.

• Smart error-proofing and traceability: Detects anomalies like over-tightening or floating screws in real time and triggers alarms. It also records tightening curves and parameters, supporting MES system integration for full traceability.

In new energy vehicle power battery assembly, this composite strategy effectively handles part variations in long-screw fastening, improving line efficiency and validating the practicality of the technology.

The torque and angle composite strategy fundamentally overcomes the limitations of poor part consistency. Thanks to innovations from brands like Danikor, this strategy is now easier to implement. As smart manufacturing continues to evolve, precision tightening technology will remain a core pillar of product quality assurance.