1. Machine Tool Overview

1.1 Machining Range

Drilling range: Φ30～Φ150 mm

Push‑boring range: Φ40～Φ500 mm

Maximum machining depth: 2 m

Maximum workpiece length: 2 m

1.2 Machine Tool Functions

Machining modes of the machine tool: Workpiece rotates while the tool is stationary with tool feed; workpiece rotates, tool rotates, together with tool feed.

Drilling: BTA drilling method is adopted. Cutting oil is supplied to the tool through the gaps between the oil feeder, tool bar and hole wall, and carries chips to be discharged through the inner bore of the tool bar.

Push‑boring: Cutting oil is supplied to the tool through the gaps between the oil feeder, tool bar and hole wall. Chips are carried by cutting oil and discharged through the bottom hole of the workpiece. During machining, the tool moves towards the headstock.

1.3 Main Application and General Layout

This machine tool is specially designed for deep‑hole machining of cylindrical and square workpieces. The machine bed features high rigidity and good precision retention performance, suitable for inner‑hole machining of large‑size workpieces. It has a wide spindle speed range. The feed system is driven by AC servo motors to meet various deep‑hole machining process requirements. The oil feeder performs servo‑driven pressing against the workpiece.

1.3.1 Main Machine Components

Machine bed, headstock, oil feeder, tool bar support, sliding guideways, gear‑rack assembly, cooling system, PLC control system, electrical cabinet, steady rest, etc.

1.3.2 Workpiece Clamping

One end of the workpiece is clamped by the chuck on the headstock, and the other end of the workpiece is pressed tightly by the cone disk on the oil feeder.

1.3.3 Machine Tool Control System

Control system: PLC control system

Z1 servo axis: Longitudinal feed motion of the drill box. The servo motor drives the gear‑rack mechanism via a reduction unit.

Z2 servo axis: Servo‑driven pressing of workpiece by the oil feeder. The servo motor drives the gear‑rack mechanism via a reduction unit.

1.3.4 Basic components such as boxes, machine bed and slide carriage are precisely cast from high‑quality cast iron. After casting, they undergo two‑time aging treatment to eliminate internal stress, stabilize microstructure and dimensions, and improve mechanical properties.

1.3.5 Machine bed

1.3.5 Machine bed

The machine bed is resin‑sand cast and normalized after casting. It adopts a split‑type structure, assembled together with high‑strength bolts and positioned by taper pins.

Double rectangular sliding guideways are applied with precision grinding and high quenching hardness on guide surfaces.

Dimension of single guideway: width × thickness = 180 mm × 50 mm; total guideway width: 800 mm. Helical rack (module 6) is fitted inside the machine bed for tool feed transmission. The rack is precision‑machined and quenched, featuring high guiding accuracy and good wear resistance. The precision rack is installed in the middle of machine bed guideways for feed and rapid traverse of the slide carriage. The machine features heavy load‑bearing capacity, sufficient rigidity and stable transmission.

V‑shaped inclined ribs are arranged inside the machine bed for high supporting strength and low deformation tendency. The outer wall of the bed directly supports the guideways, enabling the guideways to withstand heavy cutting forces with high rigidity. Deformation and chattering are avoided during machining, which helps improve machining quality and efficiency of the machine tool.

Apron‑type guards are mounted around the machine bed.

1.3.6 Headstock

It is used to drive workpiece rotation and fixed at the left end of the machine bed. It has 3 manual gears with stepless speed regulation within each gear range. The motor drives spindle rotation through coupling and gear box. A manual chuck is mounted at the front end of the headstock for workpiece clamping.

Gears are manufactured by precision grinding. Gear tooth surfaces are high‑frequency quenched to achieve high strength, high hardness, excellent wear resistance and high fatigue limit, so as to bear relatively large alternating loads and impact loads.

Circulating lubrication with lubricating oil is adopted to extend service life of gears and bearings.

1.3.7 Drill Box Section

It is used to drive tool rotation and mounted on the feed slide carriage. It is equipped with 12 manual speed gears. The motor drives the spindle to rotate via coupling and gear box. A tool shank adapter is fitted at the front end of the spindle for clamping the tool bar.

Gears are finished by precision grinding. Gear tooth surfaces are high‑frequency quenched to obtain high strength, high hardness, excellent wear resistance and high fatigue limit, so that they can bear relatively large alternating loads and impact loads.

Circulating lubrication with lubricating oil is adopted to prolong the service life of gears and bearings.

The drill box is designed with two working modes: rotating mode and fixed mode. The drill box can be locked when tool bar rotation is not required.

1.3.8 Closed‑type Steady Rest

It is used to support the workpiece. It adopts a three‑point closed‑type steady‑rest structure with two rollers at the bottom and one roller at the top. The rollers are fitted with tapered roller bearings. The transverse position of the two bottom rollers is adjusted by lead screws. The position of the steady rest on the machine bed guideways is manually adjusted via gear‑rack mechanism. Its primary function is workpiece support.

As an auxiliary fixture for workpiece clamping, the closed‑type steady rest can be applied for drilling of slender shafts as well as machining of long workpieces with large diameters.

1.3.9 Oil Feeder (Spindle‑type Structure)

It functions for tool guiding, oil supply and supporting. Driven by a servo motor for axial movement, it adapts to machining of workpieces with different lengths and realizes pressing and releasing of workpieces. Cooling and hydraulic pressure gauges of the machine tool are mounted on the front face of the oil feeder, providing real‑time display during machining for operators to judge the working status conveniently.

Servo motor drives the oil feeder to press or release the workpiece, delivering high precision and high rigidity. The oil feeder adopts an integral box‑type structure with high precision and high rigidity.

For convenient operation, the oil feeder features a unique design. Switching between drilling and boring can be achieved merely by replacing corresponding tools and accessories. No backward retraction of the oil feeder will occur due to excessive oil pressure during drilling or boring processes.

1.3.10 Feed System

Driven by servo motors, the power passes through the reduction gearbox, and then drives the slide carriage via gears and rack to realize rapid feed and working feed of the slide carriage. The feed is steplessly adjustable within the range of 0.5～1000 mm/min.

1.3.11 Tool Bar Support

It supports the tool bar and controls the moving direction of the drill bar. It adopts a high‑rigidity monolithic structure fitted with support sleeves, which can absorb shocks, chattering and others generated during machining.

1.3.12 Cooling System

It mainly consists of cooling pump, chip collecting box, oil tank and other components, supplying sufficient cutting oil for deep‑hole machining.

It is an above‑ground oil tank fully welded with high‑quality steel plates.

Telescopic protective guards are installed between chip collecting boxes on the oil tank to cover the oil tank and prevent foreign matters from falling into it.

Pressure, liquid level, oil temperature and flow rate of cutting oil are digitally displayed on the operator station.

1.3.13 Electrical Control System

Main electrical components are of Schneider brand for higher stability and reliability, which greatly reduces equipment failure rate and improves machine‑tool stability.

1.3.13 Chip Discharge Hopper

It recycles iron chips and cutting fluid and prevents splashing of cutting fluid.

For drilling, BTA internal chip‑removal mode is adopted. Cutting oil is fed from the oil feeder, enters the cutting zone through the annular cavity formed between the outer surface of the drill bar and the machined surface, carries chips backward (towards the drill box) through the inner bore of the drill bar, flows into the rear chip‑removal pipe and finally falls into the chip collecting box.

For boring, external chip‑removal mode is adopted. Cutting oil is fed from the oil feeder, enters the cutting zone through the annular cavity formed between the outer surface of the drill bar and the machined surface, carries chips forward (towards the headstock), enters the front chip‑discharge hopper and flows into the chip collecting box.

1.3.14 Machine‑tool Lubrication

The sliding guide surfaces of the feed slide carriage are lubricated by an automatic lubrication station with fixed‑time and fixed‑quantity lubrication, equipped with low‑level alarm function.

Bearings and gears of the headstock adopt circulating lubrication with an independent external oil tank, with low‑level alarm function.

Bearings and gears of the drill box adopt circulating lubrication with an independent external oil tank, with low‑level alarm function.

Slide carriages of the oil feeder and tool bar support are lubricated by manual lubrication pumps.

2. Main Parameters of Machine Tool

Technical Specifications

Machining range: Drilling range: Φ30～Φ150 mm

Push‑boring range: Φ40～Φ500 mm

Maximum machining depth range: 0.5 m‑2 m

Workpiece length range: 0.5 m‑2 m

Machine tool performance:

Z1‑axis (feed slide carriage):

Feed speed range: 0.5～1000 mm/min, stepless speed regulation

Servo motor: 35 Nm, servo motor

Z2‑axis (oil feeder movement):

Rapid traverse speed: 1.5 m/min

Servo motor torque: 27 Nm, servo motor

Headstock:

Rotational speed range: 4～440 r/min

Motor power: 45 KW, variable‑frequency motor

Spindle front taper bore: Metric 140 Chuck: Φ630 mm, manual 3‑jaw chuck

Drill box:

Rotational speed range: 40～500 r/min

Motor power: 30 KW, standard motor

Cooling system:

Maximum pressure: 2.5 MPa

Maximum flow rate: 800 L/min

Oil tank capacity: 4500 liters

Cooling motor power: 7.5 KW for 3 sets; 15 KW for 1 set

Others:

Height from spindle center to top surface of guideway: 625 mm

Maximum swing diameter over machine bed: Φ1250 mm

Clamping diameter range of steady rest: Φ100～Φ750 mm

Total installed power of machine tool: 138 KW

Machine tool load‑bearing capacity: 10 tons

Machine tool floor space: 12 m × 3.8 m

3. Other Machine

4.Contact Me：

Email：sale@dzguanlu.com

Whatsapp/Wechat:+8613853423246

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