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A servo tightening spindle is an electromechanical device that combines mechanical engineering, pneumatics, automatic control, and measurement technologies. It consists of two main parts:

1. The tightening spindle unit (the actuator).

2. An electrical control system that commands and monitors the entire tightening process.

The spindle performs fully automatic bolting, records every tightening result, and provides statistical analysis. It offers high efficiency, high accuracy, low noise, low operator fatigue, and full data traceability. In automotive powerhouses such as Germany, Japan, and the United States, servo spindles are already standard on the assembly line; in China, domestic OEMs and tier suppliers are rapidly replacing manual, pneumatic, or simple electric tools with them.

Motor technology

The motor is the spindle’s power source. As tightening strategies evolve, ever-higher static and dynamic performance is required. Most servo spindles use either brushless DC motors or AC servo motors.

Control system

The electrical control system is the “brain.” It coordinates multiple spindles, stores all traceability data (torque, angle, time), and compiles statistics. Depending on the hardware platform, the system can be:
? PLC-based
? Microcontroller-based
? Industrial-PC-based

Application example – automotive assembly

Typical joints now tightened by servo spindles:
? Wheel bolts and nuts
? Leaf-spring U-bolts on front and rear axles
? Critical fasteners in the transmission assembly

Traditional tools (manual wrenches or pneumatic guns) were slow, labor-intensive, noisy, and could not guarantee torque accuracy, creating safety and quality risks. Servo spindles solve these problems.

Market considerations

Imported servo spindles are expensive and carry high maintenance costs. To meet China’s fast-growing demand, Danikor has developed a fully localized servo spindle that offers competitive pricing while still satisfying automotive quality requirements—delivering both engineering value and practical benefits to domestic manufacturers.