CNC Deep Hole BTA And Gun Drilling Composite With Milling Machine

Deep hole drilling and milling machine Overview

1.1 Drilling Methods

Gun Drilling Method: Cutting oil enters the cutting area through the drill box spindle and the tool bore, and is discharged with chips through the V-groove of the tool post and guide frame. This is an external chip discharge method.

BTA Drilling Method: Cutting oil is supplied to the tool through the gap between the oil pressure head, tool shank, and hole wall, and is discharged with chips through the inner hole of the tool shank. This is an internal chip discharge method.

1.2 Drilling Range

Gun drilling range: Φ4 – Φ30mm

BTA drilling range: Φ25 – Φ101mm

Maximum drilling depth: 2000mm

1.3 Milling Capability
An independent milling spindle is mounted on the lifting slide above the drilling spindle. The milling spindle features its own feeding system with 300mm axial travel, driven by a servo spindle motor with stepless speed regulation.

1.4 CNC System – GSK

X-axis: Controls transverse movement of workpiece – servo control, 1500mm stroke

Y-axis: Controls vertical movement of tool – servo control, 1000mm stroke

Z-axis: Controls longitudinal feed of tool – servo control, 2000mm depth

W-axis: Controls distance between column and workpiece – servo control, 1000mm stroke

U-axis: Controls axial movement of milling spindle – servo control

B-axis: Controls workpiece indexing – servo control (CNC rotary table)

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Deep hole drilling and milling machine Main Component Structure

1.7 X-Axis – Workpiece Transverse Movement

Stroke: 1500mm

Guideways: Double rectangular sliding guideways, quenched and precision ground, hardness HRC48-52

Drive: Servo motor drives ballscrew through servo reducer

Protection: Telescopic stainless steel guideway guards

Locking: Worktable automatically locked by hydraulic system during drilling

1.8 Y-Axis – Tool Vertical Movement

Stroke: 1000mm

Guideways: Double rectangular sliding guideways, quenched and precision ground, hardness HRC48-52

Drive: Servo motor drives ballscrew through servo reducer

Locking: Lifting slide automatically locked on Y-axis column by hydraulic system during drilling

Counterweight: Counterweight blocks for balance

1.9 Z-Axis – Tool Longitudinal Feed

Stroke: 2000mm (meets drilling depth requirement)

Guideways: Roller heavy-duty linear guideways

Drive: Servo motor drives ballscrew through servo reducer

1.10 CNC Rotary Table

Dimensions: 2500mm × 2500mm

Load Capacity: 10 tons

Indexing: Automatically controlled by CNC system

Accuracy: 20″ / 15″

1.11 Drill Box – Tool Rotation

Drive: Servo main motor through reduction gear, front drive spindle rotation

Advantages: Easy tool change, excellent motor protection

Speed: Stepless speed regulation

Shared Design: Both gun drilling and BTA machining methods share the same spindle set

1.12 Drill Bar Support

4 sets, used to support the tool bar during drilling operations

1.13 Guide Frame

Shared by gun drilling and BTA machining

Gun drilling: Guide frame enables chip discharge

BTA drilling: Guide frame supplies oil to the tool

Clamping: Automatically tightens and loosens workpiece under hydraulic system control

1.14 Cooling System

Main Components: Dirty oil tank, clean oil tank, chain plate chip conveyor, drum filter, oil cooler

Tanks: Above-ground design, high-quality steel plate, fully welded

Monitoring: Pressure, level, oil temperature, and flow displayed digitally on operation station

Chip Conveyor: Removes chips, returns oil to dirty oil tank

Oil Cooler: Maintains cutting oil temperature

Drum Filter: Removes impurities from cutting oil

Pumping Units: 1 variable-frequency pumping unit + 2 quantitative pumping units

1.15 Protection

Table section: Simple protection without cover

Tool section: Oil tray for chip and coolant containment

1.16 Basic Components

All basic parts including bed, table, box, and column are cast from high-quality cast iron and undergo aging treatment to eliminate stress

1.17 Hydraulic System

Controls axial movement of guide frame for workpiece clamping/unclamping

Controls hydraulic handle plate for locking worktable, lifting slide, and W-axis pallet

1.18 W-Axis – Column Movement

Stroke: 1000mm

Guideways: Double rectangular sliding guideways, quenched and precision ground, hardness HRC48-52

Drive: Servo motor drives ballscrew through servo reducer

Locking: W-axis pallet automatically locked on bed guideway by hydraulic system during machining

1.19 U-Axis – Milling Spindle Axial Feed

Guideways: Ball linear guideways

Drive: Servo motor-driven ballscrew structure

1.20 Milling Spindle

Drive: Servo spindle motor with stepless speed regulation

Tool Change: Puller device installed for easy tool replacement

Maximum Speed: 3000r/min

Motor Power: 7.5kW (servo main motor)

Spindle Specification: BT40

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Deep hole drilling and milling machine Main Technical Parameters

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Deep hole drilling and milling machine Key Advantages

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