EV Series: Sustaining Accuracy Across the Full Travel Range
At DONGGUAN HIRUNG PRECISION MACHINERY CO., LTD, our mandate to produce "The highest quality CNC machine tool in China" means delivering precision that is not just static, but sustained across the entire working envelope. For the Efficient Vertical CNC Machining Centers (EV Series), maintaining micron-level accuracy throughout the full X, Y, and Z axes travel is critical for successful mold making and complex component manufacturing.
This superior, uniform accuracy is achieved through a meticulous, integrated strategy covering structural design, component quality, and dynamic compensation.
I. Structural Foundation: Rigidity and Dampening
The machine's integrity begins with its foundation, which must resist both cutting forces and the effects of gravity and inertia across long travels.
High-Mass, High-Grade Casting: The EV Series uses a robust, heavily ribbed cast iron structure. This substantial mass acts as a superior vibration dampener, ensuring that harmonic distortion from high-speed movements or aggressive cutting is absorbed before it can compromise the tool tip position. This rigidity is fundamental to preserving geometric accuracy over the full span.
Optimal Structural Design: The machine's structural geometry is designed to minimize the cantilever effect and maintain the perfect squareness of the three axes, ensuring that the tool path remains straight and true from the near side of the table to the far side.
II. Premium Motion Components
Accuracy is directly dependent on the quality and assembly of the linear motion components, a clear reflection of our commitment to using "High-quality Spare Parts' Suppliers."
HIWIN Roller Linear Guideways: The EV Series utilizes top-tier linear guides, such as HIWIN roller-type guides. These guides offer several advantages over traditional ball guides:
Higher Load Capacity: They can withstand greater cutting forces and loads inherent in heavy-duty machining without deflection.
High Rigidity: The contact profile ensures stiffness in all directions, which is vital for maintaining tool position as the axes traverse.
Precision Ball Screws: Movement is driven by high-precision ball screw assemblies. The balls are preloaded to eliminate backlash, ensuring that any command from the CNC control immediately and accurately translates into physical movement. This is crucial for achieving high repeatability.
III. Calibration and Compensation for Travel Integrity
Even the best components will experience minute, unavoidable mechanical deviations across long distances. HIRUNG utilizes advanced calibration to nullify these microscopic errors.
Laser Compensation Mapping: During the manufacturing and final testing phase, every EV Series machine undergoes volumetric accuracy testing using a laser interferometer. This process measures minute errors—such as pitch error (cumulative error across the length), yaw, roll, and straightness—at hundreds of points across the full travel of each axis.
CNC Integrated Pitch Error Compensation: The measured data is loaded into the CNC control (FANUC, SIEMENS, etc.) as a compensation map. The control system automatically and dynamically adjusts the servo position commands in real-time as the axis moves. This ensures that the physical position of the table or spindle remains true to the programmed position, guaranteeing uniform accuracy from end-to-end.
Thermal Stability: As the machine runs, heat can cause gradual expansion. The EV Series utilizes thermal compensation and cooling strategies (as required) to mitigate these effects, preventing positional drift and ensuring accuracy is sustained not just across the length of travel, but over hours of continuous operation.
Through this detailed approach—combining structural integrity, premium motion components, and software compensation—the HIRUNG EV Series guarantees that its promised precision is reliably maintained across the machine's entire working envelope, delivering true value to our global customers.
