CNC Cavity Deep Hole Drilling And Boring Machine Tool

CNC cavity deep hole machine tool

The machine has different functions , just need to replace the different cutting tools .

Solid drilling: To drill a hole on the solid bar with the BTA drill head .(work for twin barrel or single barrel).

Trepanning hole (Optional): To make a hole on the solid bar by trepanning head,meanwhile a solid core can be achieved . (If the workpiece material is very expensive, normally choose this method) .

Rough boring : To expand the hole of a tube by the rough boring head . (Ra6.3-Ra12.5)

Fine boring : To improve the surface roughness of inner hole by fine boring head . (Ra3.2-Ra6.3)

Burnishing : To improve the surface roughness of inner hole by burnishing head. (Ra0.2-Ra0.8)

 

 

3.1 Machine tool processing scope

Drilling range: Φ25 ~ Φ120mm

Boring range: Φ40 ~ Φ360mm

Maximum workpiece length/Maximum machining hole depth: 4000mm

3.2 Main structure of machine tool

3.2. 1 Main components of machine tools

Bed body, headstock, oil pressure head, tool bar support, drill pipe box, sliding guide rail, ball screw, cooling system, control system, electric box, workpiece bracket, cavity hole processing device, etc.

3.2. 2 Machine tool control system

Control System: SIEMENS-828D

X axis: The tool expands and contracts, and the servo motor drives the core rod to move axially through the servo reducer and ball screw.

Z-axis: the longitudinal feed motion of the drill pipe box and the structure of the servo motor driving the ball screw.

W axis: The structure in which the oil feeder servo jacks the workpiece and the servo motor drives the ball screw.

3.2. 3 The basic parts such as the box, bed, and pallet are precision cast of high-quality cast iron. After the casting is completed, they undergo two aging treatments to eliminate internal stress, stabilize the structure and size, and improve mechanical properties.

3.2. 4 Bed

The bed body is cast with resin sand, and after casting, it is normalized. The bed adopts a split structure, which is assembled together by high-strength bolts and positioned by taper pins.

Adopt double rectangular sliding guide rail, precision grinding, guide rail surface quenching hardness is high.

Ball screws are installed in the bed to realize X-direction and Z-direction movement.

V-shaped inclined bars are arranged inside the bed body, which has high support strength and is not easy to deform; The outer wall of the bed directly supports the guide rail, which can bear large cutting force. The rigidity of the guide rail is good, and it is not easy to deform and shake during processing, which is conducive to improving the machining quality and efficiency of the machine tool.

An oil return groove is cast around the bed body, an oil retaining cover is installed on the oil return groove, and the cutting oil on the bed body is automatically returned to the cooling oil tank.

3.2. 5 Headstock

Is used to drive the workpiece to rotate and is fixed at the left end of the bed body.

Manual 3rd gear, stepless speed regulation in gear, servo spindle motor drives the spindle to rotate through belt and gearbox, and a manual chuck is assembled at the front end of the headstock for clamping workpieces.

Gears are precision grinded; The tooth surface of the gear is quenched by high frequency, so that the gear can obtain high strength, high hardness, high wear resistance and high fatigue limit, and can bear relatively large alternating load and impact load.

The external lubricating oil tank is used for cyclic lubrication of gears and bearings, and a low liquid level alarm device is installed in the oil tank.

A button plate is installed on the headstock, which has the functions of spindle inching, feeding forward, feeding backward and emergency stop.

A manual locking device is installed on the spindle of the headstock, and when the spindle is not needed to rotate, the spindle is locked; Install a detection switch on the locking device, and when the spindle locking state is detected, the main motor will not start.

 

Sketch diagram of headstock appearance

3.2. 6 Oil pressure head

Used for tool guidance, tool oil supply, tool bar support.

The servo motor is used to drive its axial movement, which can adapt to the processing of workpieces of different lengths, and tighten and loosen the workpieces. The servo motor can be operated in torque mode or position mode.

The oil pressure head slewing bearing is installed inside the oil dispenser body, which has good rigidity and high slewing accuracy.

The rotary seal is installed on the outside of the right end of the oil dispenser body, which is convenient for maintenance.

A tool bar support sleeve is installed at the right end of the oil pressure head, which is used to support the tool bar.

The left end of the oil pressure head is equipped with a guide sleeve, a conical disc and an oil retaining device, the conical disc is used for positioning the workpiece, and the guide sleeve is used for guiding the tool.

The oil retaining device is a push-pull structure, and an oil receiving box is installed at the lower part of the oil retaining device, so that the cutting oil flows back to the oil tank.

 

 

Appearance diagram of oil pressure head

3.2. 7 Drilling box

Used to drive the cutter rotating, mounted on the feed pallet.

Manual 3rd gear, stepless speed regulation in gear, servo spindle motor drives the spindle to rotate through belt, pulley and gear train.

The left end of the spindle is equipped with a toolholder connecting sleeve for holding the tool.

A chip discharge bucket is installed at the right end of the spindle for discharging chips.

Gears are precision grinded; The tooth surface of the gear is quenched by high frequency, so that the gear can obtain high strength, high hardness, high wear resistance and high fatigue limit, and can bear relatively large alternating load and impact load.

The external lubricating oil tank is used for cyclic lubrication of gears and bearings, and a low liquid level alarm device is installed in the oil tank.

 

3.2. 8 Tool bar holder

For supporting the tool bar;

It adopts a high-rigidity integral structure, and is equipped with a support sleeve, which can absorb the impact, jitter, etc. generated during processing.

The automatic hanging and pulling mechanism is installed. When the tool is withdrawn, the feed pallet can automatically pull the tool bar bracket back to the initial position.

 

 

3.2. 9 Cooling System:

It is mainly composed of cooling pump, chip receiving box, oil tank, etc. to provide enough cutting oil for deep hole machining.

On-ground fuel tank, the fuel tank is fully welded with high-quality steel plate.

Install a telescopic protective cover between the chip boxes on the fuel tank to cover the fuel tank and prevent sundries from falling into the fuel tank.

The pressure, liquid level, oil temperature and flow rate of cutting oil can be digitally displayed on the control station.

 

 

3.2. 10 Feed pallets

Used to drive the tool to move axially.

The automatic lubrication station is used to lubricate the sliding guide rail surface regularly and quantitatively.

A button plate is installed on the pallet, which has the functions of inching, feeding forward, feeding backward and emergency stop of the spindle of the drill pipe box.

3.2. 11 Lubrication system

The sliding guide rail surface of the feed pallet is lubricated regularly and quantitatively by the automatic lubrication station, and has the function of low liquid level alarm.

The bearings and gears of the bedside box are lubricated by independent external oil tank circulation and have low liquid level alarm function.

The bearings and gears of the drill pipe box are lubricated by independent external oil tank circulation and have low liquid level alarm function.

The oil pressure head support plate and the tooling bar support support plate are lubricated by manual lubrication pump.

3.2. 12 Workpiece carrier

Used for workpiece prepositioning.

The operator first places the workpiece on the workpiece bracket, and after the workpiece is clamped and positioned, the workpiece leaves the bracket.

The V-shaped frame on the workpiece carrier is manually raised and lowered by using the T-shaped screw.

 

 

3.2. 13 Center frame

For supporting workpieces; Three-point closed central frame structure, two rollers below and one roller above; The two rollers below adjust the lateral position by the lead screw.

 

Machine tool main parameters

Technical specifications			Parameter	Remark
Scope of work	Range of drilling		Φ25 ~ Φ120mm
	Boring range		Φ40 ~ Φ360mm
	Max trepanning diameter		Φ220mm
	Machining depth		4m
	Workpiece length range		500-2000mm
	Range of outer diameter of workpiece held by center frame		Φ60 ~ Φ550mm
Machine tool performance	Z axis (drill pipe box feed)	Feed speed range	5 ~ 1000mm/min
		Fast moving speed	2000mm/min
		Servo motor torque/power	20Nm/3.1 KW
		Maximum feed force	60KN
	W axis (oil pressure head movement)	Fast moving speed	2000mm/min
		Servo motor torque/power	20Nm/3.1 KW
		Maximum jacking force	60KN
	X-axis (tool expansion and contraction)	Servo motor torque/power	6Nm/1.5 KW
	Drilling box	Speed range	30 ~ 1000r/min
		Motor power	37KW	Servo spindle motor
		Gear position	Manual 3 gears, intra-gear stepless speed regulation
	Headstock	Speed range	30 ~ 1000r/min
		Motor power	37KW	Servo spindle motor
		Gear position	Manual 3 gears, intra-gear stepless speed regulation
		Chuck outer diameter	Φ 500mm
	other	Total power of machine tool	120KW
		Machine tool load-bearing	3 tons
		Width of guide rail	600mm
		Machine tool footprint	14m × 3.3 m
		Height from center of spindle to above guide rail	500mm
Cooling system		Maximum pressure	2.5 MPa
		Maximum flow rate	400L/min
		Fuel tank volume about	4500L

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