CNC Deep Hole Drilling Machine For Solid Bar

Machining range:

Processing capacity:

Drilling diameter range:Φ30~Φ150mm

Boring diameter range: Φ40~Φ360mm

Workpiece outer diameter range: Φ60～Φ450mm

Machine functions

Drilling, push boring, pull boring, rolling and trepanning functions.

Drilling: BTA drilling mode, oil supply from oil pressure head, chip removal from the inner hole of tool bar.

Push Boring: During the machining process, the tool moves in the direction of the headstock, the oil pressure head supplies oil, and the bottom hole of the workpiece discharges chips.

Pull Boring: During the machining process, the tool moves away from the headstock, the oil pressure head supplies oil, and the machined holes discharge chips.

Rolling: During machining, the tool moves toward the headstock, and the oil pressure head supplies oil.

Trepanning: The inner hole of the toolholder is supplied with oil, and chips are discharged through the gap between the machined hole and the outer wall of the tool bar support.

 

Machine main parts:

Machine bed , headstock, oil pressure head, drill bar support rest, sliding guide rail, rack and pinion, coolant system, control system, electric cabinet, workpiece carrier, center rest and so on .

 

Workpiece clamping

The manual four-jaw single-action chuck on the headstock clamps one end of the workpiece, and the oil pressure head manual four-jaw single-action chuck clamps the other end of the workpiece.

Workpiece clamping sketch for reference

 

Control system:

Control system: SIEMENS-840D

Z-axis: longitudinal feed movement of the drill box, servo motor drives the rack and pinion mechanism through the reduction mechanism.

X-axis: servo jacking of workpiece by oil pressure head, servo motor drives rack and pinion mechanism through reduction mechanism.

Machine bed :

Box, bed, carrier and other basic parts are made of high-quality cast iron precision casting, and after the casting is completed, it undergoes two aging treatments to eliminate internal stresses, stabilize the organization and dimensions, and improve the mechanical properties and so on.

The bed is cast in resin sand and normalized after casting. The bed adopts split structure, assembled together with high strength bolts and positioned with taper pins.

Double rectangular sliding guide rails are adopted with precision grinding and high quenching hardness on the guide rail surface.

Inclined rack is assembled in the bed for tool feeding transmission, and the rack is precision machined and quenched. The machine tool has large load bearing, sufficient rigidity and stable transmission.

The bed body is arranged with V-type diagonal rib inside, which has high support strength and is not easy to be deformed; the outer wall of the bed body directly supports the guide rail, which can withstand large cutting force and has good rigidity, and it is not easy to be deformed and shaken during machining, which is conducive to the improvement of machine tool's machining quality and efficiency.

The periphery of the bed is casted with oil return groove, and the oil cover is installed on the oil return groove, so that the cutting oil on the bed automatically returns to the cooling oil tank.

Headstock:

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

Hydraulic two gears, stepless speed regulation within the gear, with servo spindle motor through the belt, gear box drive spindle rotation, the front end of the head box assembled chuck, for clamping the workpiece.

Gears are precision ground and processed; gear tooth surface is treated with high frequency quenching, so that the gears can obtain high strength, high hardness, high wear resistance and high fatigue limit, and can withstand relatively large alternating loads and shock loads.

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

Push-button board is installed on the headstock box, with spindle pointing, feed forward, feed backward, and emergency stop functions.

 

Sketch of Headstock appearance

 

Oil pressure head :

It is used for tool guiding, tool oil supply, and tool shank support.

The servo motor is used to drive its axial movement to adapt to the machining of workpieces of different lengths, as well as the top tightening and loosening of workpieces. The servo motor can work in torque mode or position mode.

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

Slewing seal is mounted outside the right end of the oil pressure head body for easy maintenance.

The right end of the oil pressure head is mounted with a cutter bar support sleeve for supporting the cutter bar.

The left end of the oil pressure head is equipped with a guide sleeve, chuck and oil stopping device. The chuck is used to position the workpiece and the guide sleeve is used for tool guidance.

The oil stopping device is of push-pull structure, and the lower part of the oil stopping device is installed with an oil catching box, so that the cutting oil can flow back to the oil tank.

Sketch of oil pressure head

Drill box :

For driving tool rotation, mounted on the feed pallet.

Hydraulic 2-speed, stepless speed regulation within the gear, with servo spindle motor through the belt, pulley, gear system to drive the spindle rotation.

The left end of the spindle is fitted with a shank coupling sleeve for tool clamping.

The right end of the spindle is equipped with a chip conveyor for discharging chips.

The gears are precision ground and processed; the gear tooth surface is quenched by high-frequency quenching treatment, so that the gears can obtain high strength, high hardness, high wear resistance and high fatigue limit, and can withstand large alternating loads and impact loads.

External lubricating oil tank for gears and bearings circulating lubrication, the oil tank is installed with low liquid level alarm device.

Sketch of the appearance of the drill box

Drill bar support rest:

Used to support the tool bar;

Adopting high rigidity monolithic structure, which is assembled with a support sleeve that can absorb the impact and jitter generated during machining.

Installation of automatic hanging and pulling mechanism, when retracting the tool, the feed pallet can automatically pull the toolpost support back to the initial position.

 

Sketch of the appearance of the drill bar support

Coolant system :

It mainly consists of dirty oil tank, net oil tank, chain plate chip conveyor, drum filter, oil cooler, etc. It provides enough cutting oil for deep hole machining.

Above-ground oil tank, the oil tank adopts high-quality steel plate with full welding treatment.

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

Chip Discharger: Discharge the chips and leak the cutting oil into the dirty oil tank.

Oil cooler: cooling down the cutting oil.

Drum filter: filter the impurities in the cutting oil.

Cooling system sketch

 

Feeding carrier

Used to drive the axial movement of the tool.

Adopt automatic lubrication station to lubricate the sliding guideway surface at regular time and quantity.

Push-button plate is installed on the carrier plate, which has the functions of drilling rod box spindle pointing, feeding forward, feeding backward, and emergency stop.

Machine lubrication

The sliding guide surface of the feed pallet adopts automatic lubrication station to lubricate regularly and quantitatively, with low liquid level alarm function.

The headstock bearings and gears are lubricated by independent external oil tank circulation, with low liquid level alarm function.

The bearings and gears of drilling box adopt independent external oil tank for circulating lubrication, with low liquid level alarm function.

The oil pressure head pallet and tool bar holder pallet are lubricated by manual lubrication pump.

Workpiece carrier

Used for pre-positioning of workpiece.

The operator first puts the workpiece on the workpiece carrier, and after the workpiece is clamped and positioned, the workpiece leaves the carrier.

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

Sketch of workpiece carrier

Centre frame

For supporting workpieces; three-point closed center frame construction with two rollers below and one roller above; the two rollers below are adjusted for lateral position by means of a screw.

Sketch of the center frame

Machine main technical parameters:

 

Technical specifications			Parameters	Remark
Scope of work	Drilling range		Φ30～Φ150mm
	Boring range		Φ40～Φ360mm
	Trepanning Range		Φ80～Φ350mm
	Pull Boring Range		Φ50～Φ200mm
	Max. machining depth		9000mm
	Workpiece O.D. Range		Φ60～Φ450mm
	Workpiece Length Range		500-9000mm
	Max. Workpiece Swing Diameter on Bed		Φ1000mm
	Max. workpiece weight (one center stand)		5000kg
	Max. workpiece weight (two center stands)		7500kg
Machine Performance	Z-axis (drill box feed)	Feed speed range	1～6000mm/min
		Rapid traverse speed	6000mm/min
		Servo motor	1FT7：21Nm/9.9KW
		Maximum feed force	70KN
	X-axis (oil pressure head movement)	Rapid traverse speed	4000mm/min
		Servomotor	1FT7：20Nm/6.28KW
		Maximum ejector force	60KN
	Drill box	Speed range	10～1000r/min
		Constant power speed range	110～1000r/min
		Motor power	58KW	Servo spindle motor
		Maximum spindle output torque	15000Nm
		Spindle front taper	Metric 140
	Headstock	Speed range	10～1000r/min
		Constant power speed range	60～600r/min
		Motor power	105KW	Servo spindle motor
		Max. spindle output torque	20000Nm
		Spindle front taper	Metric 140
	Control system	Numerical control system	SIEMENS-840D
		Central Processing Unit	Compatible with simaticS7
		Flat color screen	12.1 inch
		Universal interface	RS232C
		Full keyboard
	Other	Total machine power	112KW
		Load capacity of the machine	3T
		Center frame clamping range	Φ60～Φ450mm
		Clamping range of headstock chucks and hydraulic head chucks	Φ80～Φ630mm	Four-jaw single-action chucks
		Machine floor space	35m×3.3m
		Height from spindle center to top of guideway	500mm
Cooling system		Max. pressure	Maximum pressure
		Flow range	Flow range
		Tank volume approx.	Tank volume approx.

 

Machine main configurations list :

 

Name of main purchased parts and components	Manufacturing
Control system	SIEMENS
Servo motor for X-axis	SIEMENS
Servo motor for Z-axis	SIEMENS
Main motor for headstock	SIEMENS
Main motor for drill box	SIEMENS
Main electrical components	Schneider or SIEMENS
Spindle bearings for drill box	HVL
Spindle bearing for headstock	HVL
Cooling pump	China Famous Brand
Rack and pinion	Taiwan YYC