SP Series: Engineering Geometric Longevity in Large-Scale Gantry Machining
The Foundation of Permanence: How HIRUNG Secures Long-Term Accuracy for the SP Series
In the world of large-scale manufacturing, a CNC machine's value is measured not just by its initial precision, but by its ability to maintain that precision over years of heavy-duty operation. For the HIRUNG SP Series (Table Moving Type CNC Big Gantry), maintaining geometric accuracy across a structure that can exceed eight meters in length is a feat of advanced engineering and "Craftsmanship."
Here is how HIRUNG guarantees that the SP Series remains a high-precision asset for the long haul.
I. Premium Material Selection and Stress Relief
Geometric stability begins with the quality of the "Good materials" used in the foundation. A machine of this size must be immune to the internal stresses that cause lesser structures to warp over time.
High-Grade Meehanite Casting: The SP Series utilizes high-strength, heavily ribbed Meehanite cast iron for the bed, columns, and crossbeam. This material is renowned for its superior vibration dampening and thermal stability.
Scientific Aging Processes: Before machining, every major casting undergoes a rigorous thermal stress-relieving and natural aging process. This ensures that the structural "memory" of the iron is neutralized, preventing the bed or gantry from shifting or twisting years after installation.
II. Heavy-Duty Guideway Technology
The SP Series must support workpieces weighing up to 20,000 kg while moving with micron-level accuracy. The choice of guideway is critical to preventing mechanical wear-related inaccuracies.
High-Rigidity Roller Linear Guides: We utilize heavy-duty roller linear guideways on the X and Y axes. Rollers provide line contact (as opposed to the point contact of ball guides), which significantly increases the load-bearing capacity and rigidity.
Enhanced Damping: This line contact provides superior damping of cutting vibrations, which protects the geometric alignment of the machine during aggressive roughing operations, fulfilling our promise of "Challenging Extreme Tolerances."
III. Precision Transmission and Thermal Control
On a large gantry, a few degrees of temperature change can lead to several microns of expansion. The SP Series mitigates this through "Minimal maintenance" thermal strategies.
Large-Diameter, Pre-Tensioned Ball Screws: We use high-precision, large-diameter ball screws that are pre-tensioned during assembly. This pre-tensioning compensates for potential thermal expansion, ensuring that the X and Y axes return to the exact same coordinate every time.
Active Spindle Oil Cooling: By circulating temperature-controlled oil around the spindle assembly, we prevent heat from transferring into the gantry structure, preserving the squareness between the spindle and the worktable.
IV. The "Strict Accuracy" Verification Protocol
At HIRUNG, accuracy is not assumed—it is proven. Every SP Series machine is subjected to an international standard verification process before it leaves our facility.
Laser Interferometer Calibration: We use laser interferometry to map the linear accuracy and pitch error of every axis across its entire travel. This data is used to create a digital compensation map within the CNC controller.
Five-Axis Ballbar Testing: We conduct circularity and geometric checks using a wireless ballbar system to ensure that the X, Y, and Z axes are perfectly orthogonal to one another.
On-Site Leveling Expertise: Because the foundation is part of the machine's geometry, our "Training and full supports" include specialized on-site leveling and alignment by HIRUNG technicians to ensure the machine is perfectly calibrated to your factory floor.
By combining immense structural mass, roller-type guidance, and laser-verified calibration, the HIRUNG SP Series ensures that "made in China" represents a standard of geometric longevity that competes on the global stage.











