1.Machine Overview

Machine Purpose

It is used for drilling coaxial holes on cylindrical workpieces with the gun drilling method.

Drilling Method

Gun drilling: internal oil supply and external chip removal. Cutting oil flows through the rotary joint at the rear end of the drill box spindle, the inner bore of the drill box spindle and the inner hole of the tool bar to the cutting edge. The cutting oil carries chips and drains into the guide frame via the V-groove on the outside of the tool bar, then flows into the chip conveyor.

2.Machining Range

Gun drilling diameter range: φ4–φ20 mm

Max. drilling depth / Max. workpiece length: 1000 mm

Workpiece outer diameter range: φ15–φ70 mm

3. Main Machine Parameters

Technical Specifications

Working Range

Gun drilling diameter range: Φ4～Φ20mm

Maximum workpiece length: 1000mm

Maximum drilling depth: 1000mm

Workpiece outer diameter range: Φ15～Φ70mm

Maximum drilling length-to-diameter ratio: 100:1

Machine Performance

Z axis (tool feed)

Feed speed range: 5～500mm/min

Rapid traverse speed: 4000mm/min

Servo motor: 11Nm / 1.75KW

Linear guideway size: 45

Motion guideway type: Ball linear guideway

Drive ball screw: φ40mm

Drill box (tool rotation)

Maximum spindle speed: 5000r/min, stepless speed regulation

Main motor: 7.5KW

Headstock

Rotational speed: 117r/min, fixed speed

Motor power: 1.5KW, standard motor

Transmission type: Timing belt drive

Motion guideway type: Ball linear guideway

Movement mode: Manual operation

Cooling System

Maximum pressure: 10MPa, adjustable

Maximum flow rate: 100L/min, adjustable

Oil pump and motor: Gear pump with 7.5KW variable frequency motor, 1 set

Oil tank capacity: 1000 liters

Filtration type: Paper band filtration

Filtration capacity: 200L/min

Filtration accuracy: 20μm

Oil chiller cooling capacity: 5KW

Others

Total machine power (approximate): 25KW

Machine floor space: 5.5m × 3.5m

4. Machine Structure Description

4.1 Workpiece Clamping

A taper disc is mounted at the front end of the spindle for both the headstock and the guide frame. The hydraulic system controls the axial movement of the headstock. By means of the taper disc and chamfers on both ends of the workpiece, automatic clamping and positioning of the workpiece are realized. The steady rest supports the middle section of the workpiece.

4.2 Machine Bed

The machine bed is cast by resin sand process and normalized after casting. The bed adopts split structure, which is assembled with high-strength bolts and positioned by taper pins. Ball linear guideways are installed on the machine bed for the movement of headstock and drill box. V-shaped inclined ribs are arranged inside the bed to provide high supporting strength and low deformation. The outer wall of the bed directly supports the guideways. The guideways can withstand heavy cutting force with high rigidity, avoiding deformation and vibration during machining, which helps improve machining quality and efficiency of the machine. Oil return grooves are cast around the machine bed, and oil shields are mounted on the oil return grooves. Cutting oil on the bed flows back to the cooling oil tank automatically. A T-slot worktable is machined on the workpiece side of the bed for convenient installation of workholding fixtures.

4.3 Drill Box

It is used to drive tool rotation with stepless speed regulation. The servo motor drives spindle rotation through timing belt and pulleys. One main motor drives two spindles simultaneously. A set of high-speed angular contact ball bearings are fitted on the spindle. The bearings are lubricated with fixed-time and fixed-quantity oil supply from an automatic lubrication station. A rotary joint is installed at the rear end of the spindle to supply oil for cutting tools.

4.4 Tool Feed System

The servo motor drives the ball screw to realize tool feed movement. The nut on the ball screw adopts a double-nut structure and is lubricated at fixed time and quantity by an automatic lubrication station. Special bearings for the screw are installed at both ends of the screw, adopting a bearing structure with one end fixed and the other end pre-tensioned.

4.5 Tool Bar Support

It is used to support the tool bar. The support sleeves mounted on the tool bar support and the support sleeve fitted at the right end of the guide frame support the tool bar to strengthen the rigidity of the tool bar. The tool bar support is mounted on the linear guideway slide block and pulled back by the drill box during tool retraction.

4.6 Headstock

The headstock drives the workpiece to rotate at a fixed workpiece speed. A standard motor drives the headstock spindle rotation through a gear reducer, timing belt and timing belt pulleys. One motor drives two spindles. The whole headstock can be manually moved axially. After moving to the target position, it is fixed on the T-slot worktable by locking blocks. The spindle of the headstock can move axially under the control of the hydraulic system to clamp and position the workpiece. Ball linear guideways are adopted for the movement.

4.7 Cooling System

Components: chip conveyor, circulation pump, paper band filter, oil chiller, pump unit, liquid level sensor, flow sensor, pressure sensor, temperature sensor and oil tank. It is an above-ground oil tank fabricated with full welding of high-quality steel plates. Various sensors are installed on the cooling system. Liquid level, oil temperature, flow rate and pressure values are displayed on the instruments. Pump unit: one set of variable frequency pump. The output flow of the pump is adjusted by changing the motor speed. A manual overflow valve is fitted at the pump outlet to adjust the pump output pressure. Chip conveyor: removes metal chips while letting cutting oil drain into the dirty oil tank. Circulation pump: delivers cutting oil from the dirty oil tank to the filter. Paper band filter: removes impurities from cutting oil coming from the dirty oil tank and features automatic paper feeding function. Oil chiller: cools down cutting oil and starts or stops automatically according to the preset upper and lower limits of oil temperature.

4.8 Control System

CNC system: SIEMENS 808D It is mainly used to control tool rotation, tool feed, workpiece rotation, cooling system, lubrication system and hydraulic station. Once the operator presses the start button, the machine will automatically complete machining according to the program.

4.9 Lubrication System

The linear guideway slide blocks and ball screw nuts for drill box movement are lubricated at fixed time and quantity by an automatic lubrication station.

4.10 Machine Protection

Full enclosure for the main machine. When the protective sliding door is opened, the tools and workpiece are fully exposed without obstruction, facilitating tool replacement as well as workpiece loading and unloading.

4.11 Guide Frame

It is fixed at the middle part of the machine bed for tool guiding, chip removal and tool bar support. A guide bush and taper disc are mounted on its front end. The guide bush serves for tool guiding, and the taper disc is used for workpiece clamping and positioning. A tool bar support sleeve is installed on its rear end to support the tool bar. Cutting oil carrying chips flows vertically downwards through the hollow cavity in the middle of the guide frame.

5.Other Machine

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