1.Machine Processing Modes

Workpiece rotates, tool remains stationary, tool feeds forward

Workpiece rotates, tool rotates, tool feeds forward

Drilling (BTA Process)

Adopt BTA deep hole drilling method. Cutting fluid is delivered to the cutting tool through the clearance between the oil feeder, boring bar and hole wall. The fluid carries chips out through the inner bore of the boring bar.

Boring

Cutting fluid flows to the cutting tool via the gap between the oil feeder, boring bar and hole wall. Chips are flushed out through the bottom hole of the workpiece. During machining, the tool moves toward the headstock.

2. Main Machine Structure

2.1 Main Machine Components

Bed body, headstock, oil feeder, boring bar support, drill carriage, sliding guideways, rack-and-pinion, cooling system, control system, electrical cabinet, workpiece support, etc.

2.2 Workpiece Clamping

One end of the workpiece is clamped by the manual three-jaw chuck mounted on the headstock, while the taper disc of the oil feeder automatically pushes against and secures the other end of the workpiece.

2.3 Machine Control System

Control system: PLC

Z-axis: Longitudinal feed motion of the drill carriage. A servo motor drives the rack-and-pinion mechanism via a reduction unit.

X-axis: Servo-driven clamping of the workpiece by the oil feeder. A servo motor drives the rack-and-pinion mechanism via a reduction unit.

2.4 Basic Components (Housings, Bed Body, Pallets, etc.)

All basic components such as housings, bed body and pallets are precision cast from high-quality cast iron. After casting, they undergo two stress relief treatments to eliminate internal stress, stabilize metallurgical structure and dimensional accuracy, and optimize mechanical properties.

2.5 Bed Body

The bed body is resin sand cast and normalized after casting. It adopts a split structure assembled with high-strength bolts and positioned by taper pins.Dual rectangular sliding guideways are fitted and precision ground with high surface hardness after quenching.Helical racks are installed inside the bed for tool feed transmission; the racks are precision machined and quenched. The machine features heavy load capacity, high rigidity and stable transmission.V-shaped diagonal ribs are arranged inside the bed to deliver superior support strength and minimal deformation. The outer walls of the bed directly support the guideways, enabling the guideways to withstand heavy cutting forces with excellent rigidity. Deformation and chatter are avoided during machining, which improves machining quality and efficiency.Oil return channels are cast around the perimeter of the bed with oil splash guards installed on top. Cutting oil flowing down the bed automatically drains back to the cooling oil tank.

2.6 Headstock

Mounted on the left end of the bed body, the headstock drives workpiece rotation.It offers 3 manual speed ranges with stepless speed regulation within each range. A servo spindle motor drives spindle rotation through belts and a gearbox. A manual three-jaw chuck is fitted on the front end of the headstock for workpiece clamping.All gears are precision ground with high-frequency quenched tooth flanks, delivering high strength, hardness, wear resistance and fatigue resistance to withstand heavy alternating and impact loads.An external lubrication tank provides circulating lubrication for gears and bearings, equipped with a low-level alarm sensor inside the tank.A push-button panel is mounted on the headstock housing, featuring functions including spindle jog, feed forward, feed retract and emergency stop.

2.7 Oil Feeder

It serves for tool guiding, cutting fluid supply and boring bar support.

Driven by a servo motor for axial movement, it can accommodate workpieces of varying lengths and perform clamping & releasing of workpieces. The servo motor supports torque mode and position mode operation.

The rotary bearing is mounted inside the oil feeder body, featuring high rigidity and high rotary precision.

Rotary seals are fitted externally on the right end of the feeder body for easy maintenance.

A boring bar support sleeve is installed at the right end to support the boring bar.The left end is equipped with a guide sleeve, taper disc and oil baffle assembly. The taper disc locates the workpiece, while the guide sleeve guides the cutting tool.

The oil baffle adopts a pull-push structure, with an oil drain tray mounted underneath to channel cutting fluid back to the oil tank.

2.8 Drill Carriage

It is used to drive tool rotation and is mounted on the feed pallet.

It has 3 manual speed ranges with stepless speed regulation within each range. A servo spindle motor drives spindle rotation via belts, pulleys and gear trains.

A tool shank adapter is fitted on the left end of the spindle for tool clamping.A chip chute is installed at the right end of the spindle to discharge metal chips.

All gears are precision ground, and their tooth surfaces are treated with high-frequency quenching. This endows the gears with high strength, high hardness, superior wear resistance and high fatigue limit, enabling them to withstand heavy alternating and impact loads.

An external lubrication tank provides circulating lubrication for gears and bearings, and a low-liquid-level alarm device is installed inside the tank.

3. Main Machine Parameters

Technical Specifications

Machining Range

Drilling diameter range: Φ25 to Φ100mm

Pull boring and push boring diameter range: Φ40 to Φ200mm

Maximum machining depth: 7000mm

Workpiece length range: 500mm to 7000mm

Workpiece outer diameter range: Φ60 to Φ400mm

Machine Performance

Z-axis (drill carriage feed)Feed speed range: 5 to 1000mm per minute

Rapid traverse speed: 2000mm per minute

Servo motor torque and power: 19Nm / 3KW

Maximum feed force: 60KN

X-axis (oil feeder movement)Rapid traverse speed: 2000mm per minute

Servo motor torque and power: 19Nm / 3KW

Maximum clamping thrust force: 60KN

Drill Carriage

Spindle speed range: 30 to 1000 revolutions per minute

Motor power: 37KW, servo spindle motor

Speed shift: 3 manual speed ranges with stepless speed adjustment within each range

Spindle through hole diameter: Φ75mm

Spindle front taper bore: Metric 85

Headstock

Spindle speed range: 30 to 1000 revolutions per minute

Motor power: 37KW, servo spindle motor

Speed shift: 3 manual speed ranges with stepless speed adjustment within each range

Outer diameter of chuck: Φ400mm, manual three-jaw chuck

Spindle through hole diameter: Φ75mm

Spindle front taper bore: Metric 85

General Machine Parameters

Total machine power consumption: 112KW

Guideway width: 600mm

Maximum machine load capacity: 3 tons

Machine overall floor space: 20 meters × 3.3 meters

Height from spindle centerline to top surface of guideway: 400mm

Cooling System

Maximum working pressure: 2.5MPa

Maximum fluid flow rate: 400 liters per minute

Approximate oil tank volume: 5900 liters

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