1. Machine Overview

1.1 Machining Range

Drilling diameter range: Φ4～Φ26 mm Maximum drilling depth: 2000 mm Maximum workpiece length: 3000 mm Maximum outer diameter of workpiece: Φ310 mm

1.2 Machining Method of Machine Tool

Gun drilling: Cutting oil flows through the inner hole of the tool bar to the cutting zone, and carries chips out through the V-shaped groove of the tool bar.

1.3 Workpiece Clamping Method

Workpieces are clamped by standard V-blocks. Two sets of V-blocks support and clamp both ends of the workpiece respectively.

Hydraulic self-centering fixture is available as an option for workpiece clamping. A hydraulic motor drives the forward and reverse ball screws to achieve self-centering movement of the clamping jaws.

1.4 Control System

CNC System: KND X-axis: Horizontal movement of worktable; equipped with ball linear guides. A servo motor drives the ball screw under CNC control. Z-axis: Tool feed movement; equipped with ball linear guides. A servo motor drives the ball screw under CNC control.

1.5 Bed

The bed is cast with resin sand and normalized after casting. The tool bed is fitted with ball screws and ball linear guides for tool feed transmission. The workpiece bed is equipped with a T-slot worktable, which can move along the X-axis under the control of the CNC system. V-shaped diagonal ribs are arranged inside the bed to provide high supporting rigidity and resist deformation. The outer wall of the bed directly supports the guideways, enabling the guideways to withstand heavy cutting forces with high rigidity. Minimal deformation and vibration occur during machining, which helps improve machining quality and efficiency. An oil return channel is cast around the bed, allowing cutting oil to flow back to the oil tank automatically.

1.6 Drill Headstock

It is used to drive tool rotation. A servo spindle motor drives the spindle via timing belts and timing pulleys to achieve stepless speed regulation. The maximum spindle speed is 5000 r/min. A rotary joint is mounted at the rear end of the spindle in the drill headstock, which delivers high-pressure cutting oil through pipelines into the high-speed spindle to supply lubrication to the tool. The spindle is driven by the main motor from the front side. This arrangement facilitates tool loading and unloading, prevents cutting oil from entering the motor, and extends motor service life.

1.7 Tool Feed System

The movement of Z-axis is realized by a servo motor driving the ball screw. The tool feed rate can be adjusted steplessly. Ball screw is adopted for Z-axis travel, featuring low friction loss, high transmission efficiency, high precision, capability of high-speed feed and micro-feed, as well as high axial rigidity.

1.8 Drill Tube Support

It serves to support the drill tube and enhance its rigidity. During tool retraction, the drill tube support is pulled back by a chain.

1.9 Cooling System

It mainly consists of dirty oil tank, clean oil tank, chain plate chip conveyor, paper tape filter, oil chiller and pump unit, supplying sufficient cutting oil for deep hole machining.

The oil tank is installed on the ground and fully welded with high-quality steel plates. The pressure, liquid level, temperature and flow rate of cutting oil can be digitally displayed on the operation station.

Chip conveyor: removes chips and allows cutting oil to drain into the dirty oil tank. Oil chiller: cools the cutting oil. Filter: filters impurities contained in the cutting oil. Pump unit: one set of variable frequency pumps.

1.10 Guide Bracket

For gun drilling operation: it functions for tool guiding, chip evacuation and drill tube support.

A drill tube support sleeve is mounted at the rear end to support the drill tube. A guide bush is fitted at the front end of the guide bracket. Before the tool enters the workpiece, guidance is provided by the guide bush. There is no need to pre-machine pilot holes on the workpiece drilling positions, which reduces working procedures and cuts machining costs. The guide bush can move axially under hydraulic control to clamp and release the workpiece.

1.11 Hydraulic System

It controls the extension and retraction of the guide bush.

1.12 Machine Protection

The main machine is fully enclosed with a six-sliding-door structure, facilitating workpiece loading/unloading and replacement of tools and accessories. The operation station can be manually moved within the machining area.

2. Main Machine Parameters

Main parameters

Drilling diameter range: Φ4~Φ26 mm

Maximum drilling depth: 2000 mm

Maximum workpiece length: 3000 mm

Workpiece outer diameter range: Φ50~Φ310 mm

Drill headstock

Main motor power: 5.5 kW

Maximum spindle speed: 5000 r/min

Tool feed (Z-axis)

Feed speed range: 5~500 mm/min

Rapid traverse speed: 5 m/min

Servo motor: 10 Nm / 1.6 kW

Worktable transverse movement (X-axis)

Rapid traverse speed: 5 m/min

Servo motor: 10 Nm / 1.6 kW

Stroke: ±55 mm

Worktable dimension (X-axis × Z-axis): 0.4 m × 2.8 m

Cooling system for gun drilling

Maximum flow rate: 100 L/min

Maximum pressure: 10 MPa

Filtration precision: 20 μm

Oil tank capacity: 1000 L

Machining accuracy

Hole diameter tolerance: IT7~IT9

Surface roughness: Ra 0.8 μm ~ 6.3 μm

Hole straightness deviation: 0.06 mm/100 mm

Maximum drilling length-diameter ratio: 100:1

Others

Total installed power of machine (approx.): 22 kW

Floor space: 8 m × 3.5 m

Machine weight (approx.): 9.5 tons

3.Other Machine

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