CNC Pipe Threading Machine

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CNC Pipe Threading Machine

The Advanced CNC pipe Threading Machine series, independently developed by our company, utilizes the pipe rotating processing technology. It is specifically designed for the multi-directional thread processing of petroleum casing pipe and tubes, in the metallurgical steel pipe industry.

The CNC pipe threading machine, also known as the Pipe Threading cutting lathe or pipe threader, is widely used in the oil industry for producing casing pipe and coupling threads. It offers unmatched advantages over conventional lathes.

These machines are usually highly automated, precision processed and highly efficient, and can meet the strict requirements of the oil industry for the quality and performance of OCTG pipe threads. By using these professional threading machines, manufacturers can ensure the reliability and safety of OCTG pipes in various harsh environments.

It can cater to various joint products that comply with international standards. Moreover, it can process API 5CT & 5B oil pipe threads as well as other special threads and joints based on user requirements; FANUC, Siemens or other CNC systems can be configured accordingly.

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Advanted Features For The CNC Pipe Threading Machine

Novel design concept

The cnc pipe threading machine incorporates cutting-edge design concepts from similar products worldwide, showcasing exceptional precision and efficiency.

High Rigidity

Integrated 45º inclined bed, large diameter spindle and high rigidity and high capacity tapered roller bearing configuration.

High precision

The spindle unit of the pipe threading machine is optimized with imported tapered roller bearings for high precision, rigidity, and bearing capacity.

High efficiency and dynamic performance

The octg pipe threading machine possesses the attributes of exceptional efficiency, rapid spee,d and tempo, outstanding dynamic characteristics, as well as remarkable reliability

Structural Features

Front and rear double hydraulic chuck, five axis double channel, three tool holder

Thransmission

Main drive adopts spindle servo motor + synchronous belt + gear drive mode; One channel feed transmission adopts high-precision servo motor + ball screw pair + steel insert guide rail pair + slide plate injection molding process transmission mode, and the two channel feed adopts high-precision servo motor + ball screw pair + rolling guide rail pair.

High reliability and easy maintenance

The spindle and screw are equipped with bearings from reputable domestic and international brands, while the hydraulic, lubrication, lighting, cooling system, transmission belt, electrical components, and ball screw are all carefully selected from renowned manufacturers.

Robust control functionality and user-friendly man-machine interface.

The control system is equipped with either Siemens 840D or Japan FANUC numerical control system, featuring software and interface designs that adhere to human-centered principles and offer a user-friendly interface

Specification of the CNC Pipe Threading Machine

Item	Unit	DSMT-5	DSMT-7	DSMT-13	DSMT-20
Performance
Processed Tube Dia	mm	1.9″-4 1/2″	2 3/8″-7′	4 1/2“-13 3/8”	9 5/8“ -20”
Processed Tube Length	mm	4620mm-12500 mm	4620mm-12500 mm	4620mm-12500 mm	4620mm-12500 mm
Spindle System
Spindle Through Hole Dia	mm	145	165	380	640
Spindle Speed	Rpm	300-1000	150-1000	50-400	50-400
Spindle Motor	kw	110	160	160	190
Height of spindle center from ground	mm	1200	1200	1200	1290
Feeding System
X1/Y1/Z1 axis Travel	mm	110/110/550	110/110/550	160/160/550	400/600
X2/Z2 Axis Travel	mm	140/700	140/700	140/700	/
X1/Y1/Z1 axis Fast Speed	m/min	15	15	15	15
X2/Z2 Axis Fast Speed	m/min	20	20	20	/
Hydraulic Turret
Positions	Station	5-6	5-6	5-6	5-6
Drive Pattern		Servo motor or hydraulic motor drive rotation	Servo motor or hydraulic motor drive rotation	Servo motor or hydraulic motor drive rotation	Servo motor or hydraulic motor drive rotation
Hydraulic System
Hydraulic Pump Motor	kw	5.5kw	5.5kw	5.5kw	5.5kw
Pump Flow	L/Min	40	40	40	40
Machine Work Pressure	Bar	70	70	70	70
Hydraulic Oil tank Capacity	L	200	200	200	200
Accumulator capacity	l	20 L ( 35bar )	20 L ( 35bar )	20 L ( 35bar )	20 L ( 35bar )
Spindle Cooling and Lubricating System
Oil Pump Motor Power	HP	3	3	3	3
Oil Pump Flow	L/Min	60	60	60	60
Working Pressure	Bar	3-5 Bar	3-5 Bar	3-5 Bar	3-5 Bar
Oil Tank Capacity	L	160 L	160 L	160 L	160 L
Centralized Lubricating System
Oil Pump Motor Power	W	20	20	20	20
Oil Pump Flow	L/min	0.15L /Min	0.15L /Min	0.15L /Min	0.15L /Min
Working Pressure	Bar	20	20	20	20
Oil Tank Capacity	L	4l	4l	4l	4l
Emulsion cooling system
Emulsion Pump Motor	Kw	4	4	4	4
Emulsion Pump Flow	L /Min	100	100	100	100
Working Pressure	Bar	25	25	25	25
Water Tank Capacity	L	1200	1200	1200	1200
Working Accuracy
Position Accuracy (x/y/z)	mm	0.012 / 0.012 /0.020	0.012 / 0.012 /0.020	0.012 / 0.012 /0.020	0.012 / 0.012 /0.020
Repeated Position Accuracy (X/Y/Z )	mm	0.008 / 0.008 /0.010	0.008 / 0.008 /0.010	0.008 / 0.008 /0.010	0.008 / 0.008 /0.010
Backlash (X1/Y1/Z1)	mm	0.02	0.02	0.02	0.02
Workpiece circular run-out error	mm	+- 0.01 mm /200mm	+- 0.01 mm /200mm	+- 0.01 mm /200mm	+- 0.01 mm /200mm
Surface roughness of workpiece		Not Less Than Ra1.6	Not Less Than Ra1.6	Not Less Than Ra1.6	Not Less Than Ra1.6
Control System
NC System		Siemens 840 Ds1	Siemens 840 Ds1	Siemens 840 Ds1	Siemens 840 Ds1

The Main Parts of the CNC Pipe Threading Machine

01.

1.0 Main Component Introduction of the cnc pipe threading machine

The pipe threading machine host’s large structural parts are made of resin sand molding and high-strength, stress-free cast iron. This fully utilizes the castings’ vibration-damping properties to maintain the highest accuracy of the machine.

Computer finite element analysis is employed during the design process, and a frame-type internal reinforcement plate enhances vibration resistance, bending resistance, and torsional rigidity. The machine auxiliary equipment’s large structural parts are made from a steel plate welding structure that undergoes advanced pre-treatment processes as well as mature welding processes, heat treatment, and processing technologies provided by our company. This effectively eliminates welding stress while ensuring excellent rigidity and strength.

（1） The headstock is made of high-performance cast iron that undergoes double annealing to eliminate internal stress. The interior of the box features a dense ribbed structure. The main shaft incorporates a large hole design and utilizes imported, high-precision tapered roller bearings for smooth operation. Hydraulic oil is employed for cooling and lubrication purposes. Overall, the shafting exhibits excellent rigidity, minimal temperature rise, and exceptional precision.

02.

1.0 Main Component Introduction of the octg pipe threading lathe

(2) The pipe threading machine has a 45° inclined guide bed design, ensuring optimal force distribution during cutting and enabling it to withstand cutting forces from different directions.

Additionally, the spacious chip removal space effectively prevents iron filings from tangling with the pipe thread. The high-performance cast iron material undergoes two annealing processes to eliminate internal stress. The frame adopts a closed structure with an internal rib plate on the bed, widely recognized for its exceptional bending and torsional resistance. This significantly enhances cutting stiffness, accuracy, and precision retention. The bed’s guide rail is made of steel insert and undergoes quenching and grinding processes, resulting in a quenching layer thickness of at least 2.5mm and hardness reaching 70HRC. The seat is constructed using integral box-shaped dense reinforcement plates casting structure while integrating the spindle lubrication box into the seat through casting to ensure superior overall rigidity without any oil leakage during operation

(3） The guide rail of the Slide is a boxed guide that has undergone quenching and grinding to achieve a hardness exceeding 60HRC. The sliding friction surface of the carriage adopts injection molding, which offers low motion friction resistance, excellent rigidity, shock absorption, and long lifespan. This enables the machine to have superior dynamic and static friction resistance compared to conventional plastic processes, with contact stiffness similar to steel-to-steel contact. It is particularly suitable for heavy cutting environments. Hydraulic balancing cylinders are installed on the upper and lower blocks to balance the weight of both the slide carriage and turret.

03.

2.0 5-Axis Feed System of the pipe threading machine

(1) Three-axis feed device (1st channel) :

The machine utilizes imported (INA) ZARN heavy-duty needle roller thrust cylindrical roller bearings as support bearings for the three-axis feed screw. It employs a grease lubrication method and possesses exceptional accuracy, stiffness, and load capacity. Simultaneously, the ball screw is connected to the feed motor through a synchronous belt speed reduction drive, enabling the feed shaft to generate greater thrust compared to direct connection. Furthermore, a high precision absolute encoder is directly installed at the end of the ball screw to provide motion position feedback for closed-loop control by the CNC system, thereby further enhancing machining accuracy.

This configuration is standard for 1 channel.

Feeding system of octg pipe threading machine

04.

2.0 5-Axis Feed System of the pipe threading machine

(2) 2-axis auxiliary feed device (2nd -channel)

The two-axle auxiliary Slide unit is equipped with a longitudinal shaft (Z2) and a transverse shaft (X2) for move operation via a beam mounted on the top of the headstock. The transverse auxiliary shaft (X2) and longitudinal auxiliary shaft (Z2) are driven by servo motor + high-precision ball screw pair + rolling guide rail pair. The longitudinal auxiliary shaft (Z2) is installed on the transverse auxiliary shaft (X2) and is supported by it. The positioning information of the auxiliary drag shaft is fed back to the numerical control system (CNC) via the servo motor encoder.

05.

3.0 Front & Rear Clamping Chucks

The clamping of the steel pipe adopts a double hydraulic chuck structure. Prior to clamping the steel pipe, the front chuck is equipped with a hydraulic motor that extends through gears driven by three centering jaws operated by multiple screws. This allows for the floating clamping position of the steel pipe and automatic adjustment of its center, ensuring alignment between the end of the steel pipe and the center line of the Threading Machine as closely as possible. Once centered, both front and rear hydraulic chuck clamping jaws extend to securely clamp the steel pipe. This structural design enables bidirectional fixation and guarantees stability during rotation.

Turret system of octg pipe threading Lathe

06.

4.0 Turret of the pipe threading lathe

The upper turret adopts five or six stations heavy hydraulic or servo drive cutter head, quick and smooth rotation, high positioning accuracy, and strong locking force. Lower tool holder is fixed tool holder. Capto C6 tool holder is available for both upper and lower tool holders. Five feed shafts respectively control the five or six station rotating turret (X1/ Z1) – upper tool holder, and the fixed clamping platform corresponding to the rotating turret (Y1) – lower tool holder, two channels control the top clamping rod (X2/ Z2), three clamping devices simultaneously carry out cylindrical processing, Threading and other processes, greatly improving the cutting efficiency. The multi-station rotary turret not only has high precision and repetitive performance, but also has fast blade changing speed, which significantly improves production efficiency.. .

5.0 Pipe Stopper Device

The stopper is mounted on the front side of the headstock for precise positioning and stopping of the steel pipe. Its main function is to ensure that the steel pipe is accurately positioned in the machine spindle. At the same time, when the steel pipe enters the machine, if there is a failure, the device can effectively protect the machine, and absorb the steel pipe impact energy, so that it slows down and stops.

07

6.0 Conformator System

The Conformator device consists of a rotating mandrel and a hydraulic cylinder, allowing for expansion and stabilization of the inner support stabilizer. Different specifications of stabilizers can be installed based on the steel pipe’s inner diameter. Made from polyimide material, the stabilizer tightly adheres to the inside of the steel pipe when compressed and rotates with it. Its main function is to ensure processing stability, reduce vibration risk, minimize noise, and completely block the tube end to prevent emulsion from reaching other parts of the steel pipe during processing. The internal support effectively reduces workpiece vibration during machining, resulting in smooth cutting and ensuring thread surface quality while preventing cutting fluid and iron filings from entering inside.

7.0 Auxiliary System

he equipment is a pipe material loading and unloading platform, which is composed of a pipe material pre-alignment device, a pipe material conveying roller table, a rotating roller device, a walking beam steel shifting device, a conveyor roller and a rotating roller specification adjustment device, and a servo feeding device. Its main function is to meet the processing support of pipe materials and material transfer (that is, the entry and exit of pipe materials).

Conformator System of octg pipe threading Lathe

Auxiliary System of octg pipe threading Lathe

Fluid System of octg pipe threading Lathe

08.

8.0 Fluid System

(1) Lubricating system

The feed shaft unit lubrication system adopts the centralized lubrication method to lubricate the injection molding surface of the guide rail, the inclined iron and the ball screw pair. The system is an open total loss system, and the lubricating oil will be mixed into the emulsion and lost. The electrical control of the oil supply cycle and the amount of oil supplied at each lubrication point can be adjusted to achieve the best lubrication effect. The flow detection device is configured and connected to the PLC to inform the operator whether the operation is normal.

The lubrication system of the spindle unit extracts the lubricating oil in the bed oil tank of the motor oil pump group to forcibly lubricate the bearing, gear and other lubricating points in the spindle box and play a cooling role, which is a pressure injection lubrication cycle. Filters and electronic flow switches are configured to monitor the lubrication flow at relevant critical lubrication points and inform the operator whether the lubrication system is functioning properly

The auxiliary platform automatic lubrication system uses Perma or SKF (using electrochemical reaction principle) brand automatic lubrication system to achieve effective lubrication of each lubrication point.

09.

8.0 Fluid System

(2) Emulsion cooling system:

The configuration of high pressure, large flow of emulsion cooling system, the use of Threading Machine itself cutting head and rod cooling hole, the cutting fluid directly sprayed to the cutting edge and workpiece surface, rapidly reduce the temperature to extend the tool life and improve processing quality. At the same time, it is convenient to remove the iron filings and ensure the strong and effective cooling of the cutting part, so as to ensure the turning quality. In addition, it is equipped with a chip extractor and a return pump to return the emulsion into the chip extractor tank to the cooling tank after filtration. A liquid level detection device is also provided.

10.

8.0 Fluid System of the octg pipe threading machine

(3) Hydraulic System :

The hydraulic pump station unit is completely independent and can be installed according to the requirements of the end user. The unit is mainly responsible for controlling all hydraulic movements of the machine main engine and the loading bench. The hydraulic valve stand installed at the headstock contains all solenoid valves, pressure reducing valves and other hydraulic actuators to control the clamping and centering of the hydraulic chuck claws, the stopper and the balance of the feed slide and the tool holder. Equipped with liquid level detection, pressure detection, oil temperature detection devices

09.

9.0 Safety and Protection System

1. The X, Y and Z axis transmission system of the machine is equipped with multiple safety protection devices such as electrical limit, soft limit and mechanical limit to ensure that the machine is always in a safe and reliable state during work, so as to absolutely ensure the normal work safety of the operator.

2, the bed and the guide rail are protected by the fully closed telescopic guard made of stainless steel plate, effectively protecting the guide rail and screw from iron filings and emulsion erosion.

3,The machine is equipped with a beautiful and completely closed sheet metal external protection structure, which can effectively prevent iron filings, oil and emulsion splashing.

4,The machine protective door is equipped with door interlock switch and power box opening and power off protection function.

5, “CE” mark requirements, the safety protection in line with European standards.

Safety and Protection System of octg pipe threader

10.

10.0 Control System of the pipe threading machine

SIEMENS or FANUC numerical control system is used for automatic, semi-automatic and manual control of the equipment to realize automatic tube processing. The operation panel is equipped with manual/semi-automatic/automatic control mode selection and display of the working state of the equipment, while the operation panel is equipped with a touch screen for the input of processing parameters, such as: pipe body diameter, pipe body button type, pipe body length, cutting speed, feed speed and other related parameters, and has the statistical functions of the pipe body count. Operation interface through the touch screen to achieve man-machine interaction, friendly interface, programming, debugging, easy maintenance. .

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