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Through-spindle CNC Deep Hole Drilling And Boring Machine
The through-spindle deep hole drilling and boring machine is a specialized deep hole machining system developed specifically for drill collar processing. Its through-spindle headstock design is tailored to meet the unique overall layout requirements of the machine. The machine is capable of both boring and drilling operations, achieving bore dimensional accuracy of IT8 to IT9. All castings of this machine adopt a box-type structural design concept and are optimized through finite element analysis, resulting in rational mass distribution, high rigidity, and high precision. All castings are made of high-strength cast iron using resin sand molding. After casting, all components undergo normalizing treatment to eliminate internal stresses generated during the casting process. After rough machining, a second normalizing treatment is carried out to further eliminate residual casting stresses and remove machining stresses induced during roughing, ensuring excellent long-term accuracy stability.
Description
Machine Overview
The through-spindle deep hole drilling and boring machine is a specialized deep hole machining system developed for drill collar processing. Featuring a through-spindle headstock design, three machining modes, and BTA drilling, push boring, and pull boring capabilities, it delivers exceptional performance for oil and gas, energy, and heavy machinery industries.
Key Specifications
| Parameter | Value |
|---|---|
| Drilling diameter range | Φ30 – Φ150mm |
| Boring diameter range | Φ50 – Φ450mm |
| Maximum machining depth | 13000mm |
| Workpiece OD range | Φ150 – Φ600mm |
| Workpiece length range | 1000 – 13000mm |
| Spindle box speed range | 20 – 350 r/min |
| Spindle box motor power | 75kW |
| Drill pipe box speed range | 50 – 800 r/min |
| Drill pipe box motor power | 75kW |
| Z1 axis servo power | 10.5kW / 50Nm |
| Z2 axis servo power | 10.5kW / 50Nm |
| Coolant max pressure | 0.1 – 5MPa |
| Coolant max flow | 100 – 800 L/min |
| Oil tank volume | 20000L |
| Total machine power | approx. 240kW |
| Machine weight | approx. 90 tons |
Machining Methods
Workpiece and tool rotate simultaneously, tool feeds
Workpiece rotates, tool feeds
Workpiece fixed, tool rotates and feeds
Chip Evacuation Methods
BTA Drilling: Oil supplied through oil feeder, chips discharged backward through drill pipe inner hole.
Push Boring: Oil supplied through oil feeder or drill pipe rear end, chips discharged forward through workpiece inner hole.
Pull Boring: Oil supplied through oil feeder or drill pipe rear end, chips discharged forward through workpiece inner hole. Guide sleeve can be installed at tool entry end.
Key Features
Through-spindle headstock design – specialized for drill collar machining
Three machining modes – maximum flexibility
BTA drilling + push boring + pull boring – multiple operations in one machine
IT8–IT9 bore accuracy – high precision
13000mm maximum depth – extra-long workpiece capability
Box-type castings with FEA optimization – high rigidity
Double normalizing treatment – long-term accuracy stability
960mm wide bed with 800mm guideways – superior stability
Quenched rectangular guideways – high wear resistance
Dual chucks at both ends – secure clamping
Ring-type center rest – coaxial with spindle
Servo-driven oil feeder – adjustable clamping force
Anti-backlash dual gear shaft feed – precise motion
Variable-diameter boring tool – internal reaming and taper holes
Siemens 828D control – reliable and user-friendly
Main Components
| Component | Description |
|---|---|
| Bed | 960mm wide, 800mm guideways, quenched rectangular guideways, split structure |
| Spindle Box | 75kW motor, 20-350rpm, Φ610mm inner bore, circulating oil lubrication |
| Ring-Type Center Rest | Clamping range Φ80-600mm, coaxial with spindle, motor-driven |
| Center Rest | Three-point closed structure, screw adjustment |
| Oil Feeder | Tool guidance, oil supply, drill pipe support, servo-driven clamping |
| Drill Pipe Box | 75kW motor, 50-800rpm, precision ground gears, circulating oil lubrication |
| Feed Carriage | Servo motor + planetary reducer + anti-backlash dual gear shaft |
| Drill Pipe Support | High-rigidity integral structure, support sleeve |
| Variable-Diameter Boring Tool | Mechanically clamped, detachable, Siemens CNC controlled |
| Cooling System | 0.1-5MPa, 100-800L/min, 20000L tank |
| Control System | Siemens 828D, Delixi low-voltage components |
Variable-Diameter Boring Tool
Mechanically clamped, detachable design
Siemens CNC controlled, servo motor driven
Reaming of specific sections within through holes
Simultaneous radial expansion/contraction of tool and guide block
Ensures coaxiality between different bore diameters
Can machine internal taper holes by program
Simple operation, reasonable structure, low machining cost
Why Choose Through-spindle CNC deep hole drilling and boring machine ?
| Benefit | Reason |
|---|---|
| Specialized for drill collars | Through-spindle headstock design |
| Multiple operations | BTA drilling + push boring + pull boring |
| Deep hole capability | 13000mm maximum depth |
| Large diameter capability | Φ30-150mm drilling, Φ50-450mm boring |
| High precision | IT8-IT9 accuracy |
| High rigidity | Box-type castings, FEA optimized |
| Long-term accuracy | Double normalizing treatment |
| Stable clamping | Servo-driven oil feeder with adjustable force |
| Internal reaming | Variable-diameter boring tool |
| Reliable control | Siemens 828D system |
Typical Applications
Drill collars and drill pipes
Downhole tools for oil and gas
Large hydraulic cylinders
Turbine shafts and generator components
Extra-long deep hole components
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