## **Taiyo Koki Co., Ltd. – Company and Product Overview**
**Taiyo Koki Co., Ltd.**, headquartered in Nagaoka, Niigata Prefecture, Japan, is a leading manufacturer specializing in high-precision grinding machines. Established as part of the renowned DMG MORI Group, the company is widely recognized for its technological innovation and commitment to machining excellence. Taiyo Koki primarily serves industries such as automotive, aerospace, bearing manufacturing, construction equipment, and general industrial machining. Its hallmark is vertical, horizontal, and multi-process grinding technology capable of performing complex grinding tasks in a single setup.
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### **Company Profile**
* **Company Name:** Taiyo Koki Co., Ltd.
* **Established:** 1986
* **Headquarters:** 6-3-1, Higashi, Nagaoka-shi, Niigata, Japan
* **Employees:** Approximately 270
* **Business Activities:** Design, manufacture, and sale of grinding machines
* **Specialization:** Vertical cylindrical grinders, internal grinders, multi-process grinding machines
* **Group Affiliation:** Member of DMG MORI Group
* **Target Markets:** Automotive, heavy machinery, energy, shipbuilding, bearings, and precision tool industries
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### **Product Portfolio Overview**
Taiyo Koki offers a complete line of grinding machines tailored for internal, external, face, and multi-surface operations. All machines are known for their durability, tight tolerances, and adaptability to automation.
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### **A. Vertical Grinding & Multi-Process Machines**
These machines perform multiple grinding processes in a single setup, including inner diameter (ID), outer diameter (OD), and face grinding. Their vertical structure ensures a small footprint and high stability.
#### **Vertical Mate Series**
Multi-process vertical grinding machines for ID/OD/face grinding. Suitable for medium- to large-sized workpieces.
* **Models:**
* Vertical Mate 35
* Vertical Mate 55
* Vertical Mate 85 (2nd Generation)
* Vertical Mate 125
#### **CVG Series**
High-efficiency vertical grinders with automation features such as automatic tool changers (ATC) and multi-wheel spindles.
* **Models:**
* CVG-6
* CVG-9
* CVG-13
#### **NVGH Series**
Next-generation vertical grinders featuring high rigidity and precision, suitable for large, heavy workpieces.
* **Models:**
* NVGH-3T
* NVGH-6T
* NVGH-9T
* NVGH-12T
* NVGH-22T
#### **IGV/EGV Series**
Compact vertical grinders optimized for small parts with high-speed spindles.
* **Models:**
* IGV-1N
* IGV-3N
* IGV-1NT
* IGV-3NT
* EGV-3N
#### **PGV Series**
High-productivity vertical grinding machines for mass production.
* **Models:**
* PGV-2
* PGV-3
#### **NVG Series**
Special vertical grinding machines designed for long or deep workpieces.
* **Models:**
* NVG-7LH
* NVG-12LH
#### **USG Series**
Ultra-compact grinders for small-scale, high-speed grinding.
* **Model:**
* USG-2
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### **B. Horizontal Grinding Machines**
Taiyo Koki’s horizontal grinders are ideal for precision internal grinding in small to medium parts. They offer multi-spindle configurations and compact automation-ready designs.
#### **IGH Series**
Horizontal internal grinders capable of fine-tolerance ID grinding with high-speed spindles.
* **Models:**
* IGH-2NT
* IGH-7NT
#### **IGS / IGT Series**
Multi-spindle horizontal internal grinders, used for parts requiring multiple bore diameters or concurrent operations.
* **Models:**
* IGS-4NT
* IGT-8N
* IGT-12N
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### **C. Thread Grinding Machines**
Taiyo Koki also manufactures high-precision thread grinding machines for components like lead screws, ball screw nuts, and other threaded mechanical parts.
#### **TGN Series**
Thread grinders with high spindle speeds and multi-axis control.
* **Models:**
* TGN30/30
* TGN30/80
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### **Product Features and Capabilities**
#### **1. High Precision and Rigidity**
* Many models are capable of achieving roundness accuracy of ≤ 2 µm.
* NVGH and CVG series are built with thick bed casting and high-rigidity columns for long-term stability.
#### **2. Multi-Process Grinding**
* Vertical Mate and CVG series perform ID, OD, and face grinding in a single clamping operation, reducing setup times and improving consistency.
#### **3. Automation-Ready Designs**
* Automatic tool changers (ATC), robot loading interfaces, and multiple spindle heads enable seamless integration into production lines.
#### **4. Compact and Efficient Layouts**
* Vertical design allows for space-saving installation.
* USG and IGV series are particularly suited for small workshop environments.
#### **5. High-Speed Spindles**
* Spindle speeds range from 6,000 min⁻¹ (standard) to 75,000 min⁻¹ (high-speed internal spindle), depending on the model.
* Examples: IGH series offer up to 75,000 min⁻¹ for ultra-fine internal grinding.
#### **6. Workpiece Handling**
* Machines can handle part diameters from under ø10 mm to over ø2,000 mm.
* Maximum workpiece weight capacities reach up to 2,500 kg in certain NVGH and CVG models.
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### **Customization and Global Support**
Taiyo Koki machines are fully customizable. Customers can choose from:
* X/Y/Z travel range options
* Number of grinding spindles
* Integration with robotics
* High-accuracy CNC control panels with conversational programming
As a member of the DMG MORI Group, Taiyo Koki also benefits from a worldwide service and parts network, providing fast support to customers across Asia, Europe, and the Americas.
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### **Applications by Industry**
* **Automotive:** Brake discs, hubs, transmission components
* **Bearings:** Inner and outer races, precision races
* **Energy:** Turbine parts, pump components
* **Tooling:** Molds, collets, precision sleeves
* **Heavy Machinery:** Cylindrical parts, shaft housings, valve bodies
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### **Summary of Model Series**
| Category | Model Series | Sample Models |
| ------------------- | ------------- | ------------------------ |
| Vertical Grinders | Vertical Mate | 35, 55, 85, 125 |
| | CVG | CVG-6, CVG-9, CVG-13 |
| | NVGH | 3T, 6T, 9T, 12T, 22T |
| | IGV/EGV | IGV-1N, IGV-3N, EGV-3N |
| | PGV | PGV-2, PGV-3 |
| | NVG | NVG-7LH, NVG-12LH |
| | USG | USG-2 |
| Horizontal Grinders | IGH | IGH-2NT, IGH-7NT |
| | IGS / IGT | IGS-4NT, IGT-8N, IGT-12N |
| Thread Grinders | TGN | TGN30/30, TGN30/80 |
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### **Conclusion**
Taiyo Koki Co., Ltd. stands at the forefront of precision grinding machine technology. Their diverse lineup of vertical, horizontal, and thread grinding machines allows manufacturers to execute complex, high-precision operations with confidence and efficiency. The company’s ability to provide tailored solutions — supported by automation, digital controls, and global support — makes it a key partner in the global machinery and automotive supply chains.
With over three decades of industry experience, Taiyo Koki remains committed to innovation, precision, and reliability — shaping the future of grinding technology for years to come.