Okuma CNC machines are engineered for precision and durability, offering advanced solutions across diverse manufacturing sectors. These machines integrate proprietary control systems, innovative thermal management, and robust construction to achieve exceptional accuracy and productivity. Their design philosophy emphasizes consistent performance even under demanding operational conditions.
The company’s commitment to in-house development ensures seamless integration between machine hardware and control software, a critical factor for optimizing machining processes. This holistic approach allows for superior control over cutting parameters and machine behavior, leading to enhanced part quality and reduced cycle times.
Okuma’s OSP Proprietary CNC Control
Okuma’s OSP (Okuma Sampling Path) proprietary CNC control system is a cornerstone of its advanced machining capabilities, celebrating over 60 years of continuous innovation. Unlike many manufacturers who source third-party controls, Okuma designs and builds its own, ensuring optimal synchronization with machine hardware.
The OSP-P300 and the newer OSP-P500 controls operate on a Windows-based, open-architecture platform, providing flexibility for integrating PC applications and custom solutions directly on the machine. This open system allows users to access tooling lists, setup spreadsheets, and process documents from a single interface, significantly reducing setup times.
The OSP-P500, a next-generation control, features dual-core processors that enhance computing power and response speed, potentially shortening cycle times by up to 15 percent for general parts. It also incorporates ‘Smart OSP Operation’ for user-friendly guidance, making complex 5-axis machining more accessible even for less experienced operators.
Furthermore, the OSP-P500 includes robust cybersecurity measures, protecting machine processes, programs, and data from unauthorized access and cyber threats. Its ‘Eco Suite Plus’ technology monitors and analyzes energy consumption and CO2 emissions, enabling energy-saving features like ‘Eco Idling Stop’ for sustainable manufacturing.
Thermo-Friendly Machine Frame Design
| Parameter | MU-4000V (Metric) | MU-5000V (Metric) |
|---|---|---|
| Max Machining Volume (X x Y x Z) | 740 x 460 x 460 mm | Ø700 x 500 mm |
| Table Size | Ø400 mm | Ø500 mm |
| Spindle Speed (min⁻¹) | 15,000 | 10,000 |
| Spindle Motor Power (kW) | 22/18.5 | 11/7.5 |
| Rapid Traverse X-Y-Z (m/min) | 50 | 50 |
| Magazine Capacity | 32-tool [48, 64, matrix] | 32 [48, 64, matrix] |
Okuma’s Thermo-Friendly Concept is a unique approach to managing thermal deformation, a common challenge in precision machining. Instead of attempting to eliminate all heat, the concept ‘accepts’ temperature changes and compensates for them automatically, maintaining stable accuracy in typical factory environments.
This intelligent technology combines optimized machine design with advanced CNC control. Machine castings and spindles are designed for predictable thermal deflection, often with symmetrical structures and isolated heat sources like electrical cabinets and hydraulic systems.
The control system incorporates the Thermo Active Stabilizer (TAS), which has two main components: TAS-S for spindle temperature management and TAS-C for machine construction thermal characteristics. TAS-S monitors spindle speed, temperature, and rotation to automatically adjust for deformation, while TAS-C uses strategically placed sensors to predict and control deformation from ambient temperature changes.
Implementing the Thermo-Friendly Concept eliminates the need for machine warm-up operations and manual adjustments, saving significant time and energy. This results in consistent, high-accuracy machining over long, continuous runs, regardless of fluctuating ambient temperatures.
Rigid Lathe Construction
Okuma lathes are renowned for their exceptional rigidity and robust construction, which are fundamental to achieving high precision and superior surface finishes. A key design element is the slanted box bed construction, which provides outstanding dimensional stability and vibration damping.
This construction method optimally positions the headstock and turret on a solid box bed, ensuring stable machining accuracy even during heavy-duty cutting operations. The slanted configuration also facilitates superior chip evacuation compared to traditional flat-bed designs, preventing heat buildup and maintaining part quality.
Machines like the LB Series, including models such as the LB3000 EX III and LB4000 EX III, exemplify this rigid design. They feature high-power PREX motors that deliver substantial torque for both heavy and high-speed cutting, further supported by the machine’s inherent stability.
Okuma’s commitment to build quality extends to using cast iron frames with heavy ribbing and robust spindle bearings. This minimizes vibrations, extends tool life, and ensures consistent accuracy, even during prolonged machining cycles.
Advanced 5-Axis Machining Centers
Okuma’s 5-axis machining centers, such as those in the MU-V series (e.g., MU-4000V, MU-5000V), are designed for high efficiency and productivity in multi-sided and complex part machining. These machines integrate the linear X, Y, Z axes with rotational A and B (or C) axes, enabling simultaneous 5-axis cutting.
Many 5-axis models feature a highly rigid and accurate double-column structure, which significantly reduces vibrations and tool deflection. The low center of gravity in workpiece movement, often achieved with a trunnion table, allows for both heavy-duty cutting and high-speed finishing.
Standard tolerances for high-quality 5-axis machines typically range from ±0.005 to ±0.010 inches (0.127 to 0.254 mm) for most applications. For demanding sectors like aerospace or medical manufacturing, advanced Okuma machines in controlled environments can achieve tolerances as tight as ±0.0001 inches (0.0025 mm).
These machines are equipped with features like ball-screw cooling to reduce following errors and maintain accuracy. The 5-Axis Auto Tuning System further enhances precision by detecting and compensating for manufacturing tolerances and wear-related errors in machine geometry.
Here are some typical specifications for Okuma 5-axis vertical machining centers (MU-V series):
Japanese Machine Engineering Principles
Okuma’s engineering philosophy is deeply rooted in the Japanese concept of ‘Monozukuri,’ which translates to ‘the art of making things better.’ This philosophy drives continuous improvement, meticulous craftsmanship, and a commitment to delivering long-term value beyond just supplying machines.
This approach emphasizes a holistic development process, from initial design to final shipping, ensuring adherence to fundamental principles of high rigidity and accuracy. Close cooperation between product development, design, and manufacturing departments is a traditional corporate culture at Okuma.
Okuma’s dedication to precision is evident in its rigorous testing and analysis, including over 30 years of accumulating thermal data to optimize machine designs for thermal deflection. This long-standing commitment to mechatronics—blending mechanical engineering and electronic control development—ensures harmonious communication between the machine and its control.
The company’s focus on quality extends to the training of its personnel, who are encouraged to ‘hone their five senses’ to detect subtle changes in machine behavior. This human element, combined with advanced technology, ensures that Okuma machines consistently deliver the highest level of product quality and accuracy.