SG404 High-Precision CNC Ball Screw Whirling Machine

Overview

The SG404 is specifically engineered for the high-speed production of short ball screws and automotive EPS steering worms up to 500mm. By minimizing the machining envelope, the SG404 achieves exceptional structural rigidity, allowing for aggressive cutting speeds without sacrificing Grade P5 surface finish.

This CNC Ball Screw Whirling Machine is engineered with a rear-mounted vertical guideway, significantly enhancing machining rigidity while optimizing chip evacuation. The machine features a fully enclosed structure with stainless steel telescopic covers, ensuring durability and a clean workspace. All hydraulic, pneumatic, and electrical lines are systematically routed for a streamlined and industrial-grade layout.

 

Drive & Closed-Loop Control System

The core whirling motion relies on the synchronized interpolation of the C-axis (spindle rotation) and Z-axis (linear feed) to generate precise spiral trajectories.

• C-Axis: Driven by a servo motor through a planetary reducer and dual-stage anti-backlash gears, combined with a high-precision rotary encoder for full closed-loop control.
• X & Z Axes: Both axes utilize precision linear scales (mounted away from the operator on the Z-axis) coupled with servo motors to establish a complete closed-loop system, guaranteeing exact positioning and radial feed accuracy.
• Compensation: The CNC software includes advanced base-length pitch compensation and diameter compensation functions to eliminate machining deviations.

Clamping & Auxiliary Support

Designed for high-precision long shaft milling, the clamping and support mechanisms are highly dynamic:

• Hydraulic Collets: Secures the workpiece efficiently, compatible with collet specifications ranging from 16, 20, 25, 32, 40, 50, 63, 80, to 100.
• Auto-Centering Servo Clamps: Positioned on both sides of the whirling mechanism, these clamps adjust clamping force via servo motor current, maximizing rigidity near the cutting head.
• Dynamic Auxiliary Support: Utilizes two sets of servo-driven cylinders that automatically retract when the carriage approaches and re-engage once it passes. An integrated air-blow system clears chips from the supports to prevent surface damage.

Whirling Head & Milling Process

The whirling head is powered by a variable-frequency motor via belt reduction, with speeds precisely controlled by the system program. The helix angle is automatically adjusted via a servo motor and reducer. The machine allows for a minimum distance of ≤260mm from the headstock chuck to the cutting center, and ≤200mm from the cutting center to the rear clamp, maximizing material utilization by enabling full-length continuous milling before segmentation. An integrated chain-plate chip conveyor efficiently transports machined chips to the collection box.