TSK2125DZ CNC Deep Hole Drilling and Boring Machine for Eccentric Hole Machining

Product Overview

The TSK2125DZ CNC Deep Hole Drilling and Boring Machine is designed for precision deep hole machining of long workpieces, including components requiring eccentric or off-center holes. Manufactured by Dezhou Guanlu Precision Machinery Co., Ltd., this machine integrates deep hole drilling, push boring, pull boring, and eccentric hole machining capabilities into one machine tool.

Equipped with a Siemens CNC control system, the TSK2125DZ is suitable for machining cylindrical workpieces with a maximum length of 5,000 mm. Its dedicated eccentric workpiece fixtures allow the machine to process offset holes in workpieces with a maximum outer diameter of 350 mm and a maximum eccentric hole spacing of 120 mm.

With a rigid machine bed, servo-driven feed system, and high-pressure cutting oil circulation system, this CNC deep hole drilling and boring machine provides a practical solution for manufacturers requiring versatile deep hole machining capabilities.

Key Features of the TSK2125DZ Deep Hole Drilling Machine

Eccentric Hole Machining: Special eccentric fixtures support the positioning and machining of off-center holes in cylindrical workpieces.

Multiple Machining Processes: Supports BTA deep hole drilling, push boring, and pull boring for different hole machining requirements.

Siemens CNC Control System: Provides CNC control of the feed system and workpiece clamping movement.

Servo-Driven Feed System: Uses servo motors and ball screws for controlled axial tool feed and oil feeder movement.

Rigid Machine Structure: The machine bed features resin-sand casting, stress-relief treatment, and precision-ground hardened sliding guideways.

Powerful Spindle Drives: The drilling spindle box and workpiece headstock are each equipped with a 37 kW servo spindle motor.

High-Capacity Cooling System: The cutting oil system provides a maximum flow rate of 400 L/min to support deep hole machining and chip evacuation.

Automatic Lubrication and Safety Protection: Includes automatic lubrication, coolant monitoring, motor overload protection, and travel limit protection.

Technical Specifications

Parameter	Specification
Machine Model	TSK2125DZ
CNC Control System	Siemens
Maximum Drilling Diameter	Ø100 mm
Drilling Diameter Range	Ø25–100 mm
Push Boring Diameter Range	Ø40–250 mm
Pull Boring Diameter Range	Ø40–180 mm
Maximum Machining Depth	5,000 mm
Workpiece Length	500–5,000 mm
Workpiece Outer Diameter	Ø90–500 mm
Maximum Workpiece Diameter for Eccentric Hole Machining	Ø350 mm
Maximum Eccentric Hole Spacing	120 mm
Drilling Spindle Speed	30–1,000 rpm, stepless adjustment
Headstock Speed	30–500 rpm
Drilling Spindle Motor Power	37 kW
Headstock Motor Power	37 kW
Maximum Feed Force	60 kN
Maximum Oil Feeder Clamping Force	60 kN
Maximum Cutting Oil Flow Rate	400 L/min
Cutting Oil Tank Capacity	Approx. 5,100 L
Total Machine Power	112 kW
Machine Footprint	Approx. 16 m × 3.3 m
Machine Load Capacity	3 tonnes

Note: Final machining capacity depends on the workpiece dimensions, tooling, fixture design, and selected machining process. Please consult Guanlu for application-specific confirmation.

Eccentric Hole Machining Capability

One of the key advantages of the TSK2125DZ is its ability to machine eccentric holes in cylindrical workpieces.

For eccentric hole machining, dedicated eccentric fixtures are installed on the headstock and oil feeder. Positioning pin holes in the fixtures are used to locate the workpiece according to the required eccentricity. During machining, the workpiece rotates at low speed while the cutting tool rotates and feeds axially.

This configuration is designed for applications where the hole center does not coincide with the workpiece centerline.

Key eccentric machining specifications:

Maximum workpiece outer diameter: Ø350 mm

Maximum eccentric hole spacing: 120 mm

Dedicated eccentric workholding fixtures included for the specified maximum workpiece size

The machine is suitable for manufacturers who need a deep hole drilling machine capable of handling both conventional concentric holes and specially positioned eccentric holes.

Deep Hole Drilling, Push Boring and Pull Boring

1. BTA Deep Hole Drilling

The TSK2125DZ supports BTA deep hole drilling. Cutting oil is delivered to the cutting zone through the oil feeder and the clearance between the tool and the hole wall. Chips are evacuated through the internal passage of the drill tube.

This process is suitable for producing deep holes in long workpieces.

2. Push Boring

During push boring, cutting oil is supplied through the oil feeder and the clearance between the boring bar and the hole wall. Chips are discharged through the existing hole in the workpiece, while the tool moves toward the headstock.

Push boring is suitable for enlarging existing holes within the machine's specified boring diameter range.

3. Pull Boring

During pull boring, the boring bar passes through the workpiece bore and is connected to the spindle at the front of the headstock. The cutting tool moves away from the headstock during machining, while chips are discharged through the workpiece bore toward the headstock.

The three machining processes give manufacturers greater flexibility when machining deep holes of different diameters and configurations.

Machine Structure and Configuration

Rigid Machine Bed

The machine bed is manufactured using resin-sand casting and undergoes normalizing treatment. Its double rectangular sliding guideways are precision-ground and hardened to provide rigidity and stable tool movement under cutting loads.

Siemens CNC Feed Control

The machine uses a Siemens CNC system. The Z-axis controls the longitudinal feed of the drilling spindle box through a servo motor, reduction mechanism, and ball screw. The X-axis controls the axial movement of the oil feeder for workpiece clamping and release.

Headstock and Drilling Spindle Box

Both the workpiece headstock and drilling spindle box use 37 kW servo spindle motors. Their three manual gear ranges provide stepless speed adjustment within each range.

Cutting Oil Circulation System

The cutting oil system provides a maximum flow rate of 400 L/min. Cutting oil pressure, liquid level, temperature, and flow rate can be displayed digitally at the operating station.

Workpiece Support and Safety Protection

The machine includes workpiece support brackets, a steady rest, a tool bar support, and dedicated eccentric fixtures for the specified application. Protection functions include lubrication low-level monitoring, coolant pressure and level monitoring, motor overload protection, fault alarms, and travel limits.

Machining Accuracy

The technical proposal specifies the following machining performance:

Machining Process	Hole Diameter Accuracy	Surface Roughness
Rough Boring and Drilling	IT9–IT11	Ra 6.3–12.5 μm
Pull Boring	IT9–IT10	Ra 3.2–6.3 μm
Finish Boring	IT8–IT9	Ra 1.6–3.2 μm

The specified deviation values are 0.5 mm per 1,000 mm for rough boring and drilling, and 0.1 mm per 1,000 mm for pull boring.

Actual machining results depend on the workpiece material, tool selection, cutting parameters, and operating conditions.

Applications

The TSK2125DZ CNC deep hole drilling and boring machine can be considered for manufacturing applications that require deep holes, hole enlargement, or eccentric hole positioning in long cylindrical components.

Typical application areas may include:

Hydraulic cylinder and industrial cylinder components

Long cylindrical mechanical parts

Components requiring offset or eccentric deep holes

Heavy-duty machinery components

Custom deep hole machining and boring operations

Specific workpiece suitability should be confirmed according to the required hole geometry, material, dimensions, and production process.

Contact: Lilian Lee
Whatsapp: +8619819312517
Email: drilling@dzguanlu.com

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