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The Casing and Tubing Coupling Bucking Unit Lathe is a specialized CNC machine tool engineered for the precise assembly and disassembly of couplings onto oil country tubular goods (OCTG). This equipment integrates mechanical, hydraulic, and electronic control systems to ensure that make-up torque and positional requirements meet API 5CT specifications. Designed for high-torque coupling installation, the unit maintains the structural integrity of the thread connection while optimizing production throughput in pipe finishing lines.
Technical Design and Operational Features
The architecture of the bucking unit utilizes a low-inertia spindle drive system and a heavy-duty hydraulic power tong mechanism. This configuration allows for the continuous monitoring of torque-turn values, which is critical for preventing over-torquing or thread galling during the assembly of casing and tubing. The lathe-style bed provides a rigid foundation that minimizes vibration, ensuring consistent thread engagement and long-term geometric precision.
Equipped with a programmable logic controller (PLC), the system supports automated sequences for different pipe diameters and steel grades. The non-marking jaws or specialized gripping dies are employed to prevent surface deformation on high-alloy materials, a common requirement for corrosion-resistant alloy (CRA) tubing assembly. By utilizing a closed-loop feedback mechanism, the bucking unit adjusts rotational speed and pressure in real-time based on the specific threading parameters of the coupling.
Key Performance Advantages
- Torque Accuracy: High-precision sensors provide real-time data acquisition for API coupling make-up, ensuring every joint meets certified safety standards.
- Operational Versatility: Capable of handling a wide range of pipe sizes, from small diameter tubing to large-scale casing, without requiring extensive tooling changes.
- Rigidity and Stability: The reinforced frame construction allows for high-duty cycle operations in demanding industrial environments.
- Data Integration: The system records make-up graphs (Torque vs. Turns) for quality traceability, essential for OCTG manufacturing compliance.
Technical Specifications
| Parameter Description | Technical Data / Range | Unit |
| Applicable Pipe Diameter Range | 60.3 - 508 (Customizable) | mm |
| Maximum Make-up Torque | 10,000 - 150,000 (Based on Model) | N·m |
| Spindle Speed Range | 0.5 - 25 (Infinitely Variable) | rpm |
| Torque Measurement Accuracy | ±1% | Full Scale |
| Clamping Mode | Multi-point Hydraulic / Synchronous | Type |
| Control System | CNC / PLC with Torque-Turn Monitoring | Platform |
| Power Supply | 380V / 415V / 440V (50/60Hz) | V/Hz |
Applications in Petroleum Equipment Manufacturing
The Casing and Tubing Coupling Bucking Unit Lathe is primarily utilized in pipe threading facilities and oilfield service centers. It serves as a critical component in the production of API-certified casing and tubing, where manual make-up is insufficient for high-pressure requirements. This machine is also essential for premium connection assembly, where specific torque-shoulder contact must be verified through digital charting.
Frequently Asked Questions
1. How does the bucking unit ensure the integrity of premium thread connections?
The unit utilizes a sophisticated computerized torque-turn monitoring system that tracks the relationship between applied torque and the number of rotations. This allows for the precise detection of the "shoulder point" in premium connections. Jiangsu Taiyuan CNC Machine Tool Co., Ltd., established in 2003 and located in the East Industrial Park of Taixing City, engineers these machines with high rigidity and failure-point reduction technologies. Our Coupling CNC pipe threading lathes and bucking units are designed to maintain precision retention over long periods, ensuring that even complex thread profiles are assembled without damage, meeting the rigorous standards of international oilfield enterprises.
2. Can this equipment be integrated into a fully automated OCTG production line?
Yes, the bucking unit is designed for seamless integration with automatic pipe handling systems and conveyor lines. Jiangsu Taiyuan CNC Machine Tool Co., Ltd., which covers an area of 24,800 ㎡ and serves as a major production base for national petroleum equipment manufacturing, provides complete solutions including drill pipe production lines and specialized grinding machines. Our products are widely used by global leaders such as Shanghai Baosteel and international firms in the United States and Japan. The high driving power and simple structure of our equipment allow for high production efficiency and high-duty cycle integration in modern automated factories.
3. What certifications and quality standards do these machines adhere to?
Our Casing and Tubing Coupling Bucking Unit Lathe is manufactured under strict quality control protocols. Jiangsu Taiyuan CNC Machine Tool Co., Ltd. has obtained the GBT, ISO quality system certification and is recognized as a national quality trustworthy enterprise. Our technical expertise extends to a wide array of specialized tools, including drill collar thread lathes and screw pump rotor milling machines. These products are engineered for strong specificity and reliability, ensuring that every joint processed meets the safety requirements of the geology, mining, and chemical industries worldwide.
For detailed project consultations or customized OCTG processing equipment configurations, please contact our technical sales department. We look forward to sharing development with you to create a better future.
