Features and Key Points of Dual Servo Power Head Tapping and Threading

During dual-servo power head tapping and threading operations, the equipment generally adopts fully automatic feeding and positioning methods, especially in high-precision tapping and drilling applications.

Tapping - A machining process that cuts internal threads, screws, or threads on the inner surface of holes in various parts such as machine housings, equipment end faces, nuts, flanges, and other components with through holes or blind holes of different specifications. Tapping machines are also called thread tapping machines, automatic tapping machines, etc.

Threading - Threading involves using a specific torque to screw a tap into a pre-drilled bottom hole to form internal threads.

General application features:

Tapping

Based on the degree of automation in the tapping machine's processing:

Tapping machines can be classified into fully automatic tapping machines, semi-automatic tapping machines, and manual tapping machines.

Based on whether drilling is performed simultaneously during tapping:

Tapping machines are further divided into drilling and tapping machines, and reaming and tapping machines. Fully automatic tapping machines have the highest degree of automation. During operation, simply place the workpiece blanks into the hopper, and the machine will automatically feed, position, clamp, tap, and unload. One worker can operate multiple machines simultaneously, resulting in high production efficiency and significant labor cost savings!

High-quality tapping machines feature innovative design, reasonable structure, ease of use, high automation, convenient operation, high efficiency, maintenance-free operation, and excellent cost performance. High-quality nut tapping machines produce nuts with high thread finish and high product qualification rates.

High-precision tapping stroke adjustment is simple; the tapping stroke can be freely adjusted based on the automatic reverse device of the tapping system. Even shallow holes and workpieces with holes can be easily adjusted. The dual safety device prevents tap damage (breakage). The spindle rotation, up/down, and forward/backward feed are equipped with a special dual safety clutch. The spindle can stop automatically, and reverse withdrawal will not damage the tool.

The pitch A and B gears, combined with the A and B shafts and spindle, advance in perfect synchronization with the pitch, ensuring vertical stability, accuracy, and exceptionally high precision. During screw tapping, forward and backward movements operate smoothly without effort. This ensures high-quality processed items without uneven threads. Even soft materials such as thin plates, light alloys, and synthetic resins can be tapped to perfection. Additionally, it can be equipped with a multi-spindle head for simultaneous multi-spindle processing, greatly improving production efficiency.

Adopting
Dual Servo Tapping Power Head
offers many advantages and strengths, mainly including the following:

1. The spindle forward and backward feed is set by the system CNC, with precise coordination between the spindle servo and feed servo, achieving extremely high closed-loop precision throughout the process.

2. After setting the required thread pitch, depth, and other parameters, the operator does not need manual intervention.

3. Capable of high-speed continuous cycle operation, durable and robust.

4. Beginners can quickly get started with an intuitive and simple program.

5. High-precision tapping stroke adjustment is simple.

6. When used with inspection components, it prevents tap breakage.

7. The combination with a multi-spindle tapper enables high-efficiency operation.

Tapping Essentials

(1) Chamfer the hole opening of the threaded bottom hole on the workpiece; chamfer both ends of through-hole threads.

(2) Position the workpiece clamp correctly, preferably with the threaded hole centerline horizontal or vertical, making it easier to determine if the tap axis is perpendicular to the workpiece surface.

(3) At the start of tapping, align the tap as straight as possible, apply pressure and turn the wrench; after 1-2 threads are cut, carefully check and correct the tap position. Generally, after 3-4 threads are cut, the tap position should be correct. Thereafter, only turn the wrench without applying additional pressure, otherwise the thread profile will be damaged.

(4) During tapping, for every 1/2-1 turn of the tap wrench, reverse about 1/2 turn to break chips for easy removal and prevent tap seizure due to chip adhesion on cutting edges.

(5) When tapping blind holes, frequently withdraw the tap to clear chips from the hole.

(6) When tapping threads in plastic materials, apply cutting fluid. For steel, use machine oil or high-concentration emulsion; for higher requirements, use rapeseed oil or molybdenum disulfide. For stainless steel, use No. 30 machine oil or sulfurized oil.

(7) When switching to the next tap during tapping, first hand-thread it into the already tapped thread until it cannot go further, then use the tap wrench. When withdrawing the final tap, avoid rapid rotation; preferably hand-unscrew to ensure thread quality.

(8) During machine tapping, maintain coaxiality between the tap and the threaded hole.

(9) During machine tapping, the tap's chamfer should not fully exit the hole; otherwise, thread damage may occur when reversing the tap out.

(10) Cutting speed during tapping: generally 6-15 m/min for steel; 5-10 m/min for quenched and tempered or harder steel; 2-7 m/min for stainless steel; 8-10 m/min for cast iron. For the same material, use a higher value for smaller tap diameters and a lower value for larger tap diameters.