The Coupling Threading Machine uses Q345-A steel plates for large structural parts such as the spindle box. Advanced pre-weld treatment, mature welding, heat treatment, and machining processes effectively eliminate welding stress. Moreover, the elastic modulus of steel is much higher than that of cast steel or cast iron, giving the spindle box superior rigidity and strength.

The spindle adopts a large through-hole design and uses imported high-precision tapered roller bearings with hydraulic oil cooling and lubrication. As a result, the entire spindle system offers excellent rigidity, low temperature rise, and high accuracy.

With these advantages, the Coupling Threading Machine—also known as a Coupling Threader, Coupler Threading Machine, or Coupling Threading Lathe—ensures reliable performance for demanding oilfield threading operations.

The Coupling Threading Machine uses steel-inlaid guideways for the carriage, which are hardened and ground to achieve a hardness above 60 HRC. In addition, the sliding friction surfaces of the carriage adopt an advanced injection molding process. This design provides low friction resistance, excellent rigidity, superior vibration absorption, and long service life.

As a result, the dynamic and static friction resistance during low-speed feed is far better than conventional pasted plastic processes. Moreover, the contact stiffness between guideway pairs is close to steel-to-steel contact, making it ideal for heavy-duty cutting environments. To further enhance stability, the slide is equipped with a hydraulic balance cylinder to offset the weight of the slide and turret.

The Coupling Threading Machine is equipped with a hydraulic swivel chuck device that allows complete machining of both internal surfaces and end faces of the coupling in a single clamping. After the coupling blank is clamped, the first side is machined. Once completed, the swivel chuck rotates 180° around its axis, enabling machining of the second side without re-clamping.

This hydraulic swivel chuck offers high rotation accuracy and exceptional reliability. During processing, the chuck pressure can be adjusted to control clamping force according to different machining requirements. For example, during rough boring, where cutting forces are high, a stronger clamping force is applied. Conversely, during finish boring and threading, a lower clamping force is selected to prevent deformation of the coupling. This feature is particularly effective for large-diameter, high-strength couplings, ensuring precise thread alignment at the center.

With these advantages, the Coupling Threading Machine delivers superior flexibility, precision, and reliability for demanding oilfield threading operations.

The Coupling Threading Machine is equipped with a high-grade vertical four-position hydraulic turret, independently developed by our company to meet the demands of heavy cutting and high precision. This turret features a compact structure, high indexing accuracy, fast and smooth rotation, strong locking force, excellent load capacity, and easy maintenance.

• Precision Indexing: Uses a hardened, large-diameter end-tooth disc as the indexing component for accurate positioning.
• Reliable Signal Transmission: Turret coding adopts proximity switches for signal output and can communicate directly with the PLC system.
• Powerful Locking: Hydraulic cylinder locking provides strong clamping force, significantly enhancing the machine’s capability for heavy-duty cutting.

With these advantages, the Coupling Threading Machine ensures stable performance, precise tool positioning, and high reliability for demanding oilfield threading operations.

The Coupling Threading Machine uses a centralized lubrication system for the feed axis unit. It lubricates all critical points, including guideway sliding surfaces, wedge blocks, and ball screw assemblies. This is an open, total-loss system where the lubricant mixes with the coolant and drains away. The electrical control system allows adjustment of oil supply cycles and flow to each lubrication point for optimal performance. A flow detection device connected to the PLC monitors system operation and alerts the operator if any abnormality occurs.

The spindle unit lubrication system uses a motor-driven oil pump to draw lubricant from the bed oil tank and deliver it to bearings and other key points inside the spindle box. This forced lubrication method also provides cooling and operates as a pressure spray circulation system. A filtration unit and electronic flow switch monitor lubrication flow at critical points and notify the operator of any irregularities.

The gantry loader uses an automatic centralized grease lubrication system to ensure effective lubrication of all points. All lubrication systems are equipped with liquid level alarms for added safety and reliability.

The Coupling Threading Machine is equipped with a high-pressure, large-flow emulsion cooling system to ensure powerful and effective cooling of the cutting tool edge during machining. This system also facilitates chip removal, guaranteeing excellent turning quality. A chip conveyor is included, and it features a return pump that filters the emulsion collected in the chip conveyor tank and returns it to the cooling tank. Additionally, a liquid level detection device is installed for monitoring.

The Coupling Threading Machine is designed with multiple safety and protective features to ensure reliable operation and operator security. Both the X and Z-axis drive systems are equipped with electrical limit switches, software limits, and mechanical limiters, keeping the machine in a safe working state at all times.

To protect critical components, the bed and carriage guideways are fully enclosed with stainless-steel telescopic covers, preventing chips and coolant from causing damage. The machine also features a full sheet-metal enclosure with a modern design that effectively stops chips, oil, and emulsion from splashing outside the work area.

The system uses SIEMENS or FANUC CNC controls to manage automatic, semi-automatic, and manual operations. Operators select control modes and view machine status directly from the panel. In addition, the touchscreen interface simplifies input of machining parameters.

Users can enter coupling specifications, thread types, and lengths. They also set cutting speed, feed rate, and track production quantities. Meanwhile, the system displays real-time feedback and supports quick adjustments.

Thanks to the touchscreen, programming and maintenance become intuitive. As a result, human-machine interaction improves, and workflow efficiency increases. Moreover, the interface design ensures fast setup, easy debugging, and smooth operation.

The gantry manipulator system integrates several key modules, including the coupling flipping unit, the infeed and outfeed roller conveyors, the coupling sorting module, the gantry frame, and the clamping fixtures. Together, these components form a continuous and coordinated handling process.

The coupling flipping unit operates through a hydraulic or pneumatic cylinder that drives the receiving platform. The robotic arm places raw couplings onto the platform, while the gantry manipulator unloads finished couplings in the same way. From there, the unit transfers each coupling to the appropriate conveyor, guiding it either into the machine or toward the discharge path

The infeed and outfeed roller conveyors maintain the flow of materials. After the robotic arm loads a raw coupling into the flipping unit, the coupling moves along the infeed conveyor toward the machine tool. Once machining is complete, the gantry manipulator places the finished coupling into the outfeed flipping unit, which then delivers it onto the outfeed conveyor.