CNC Deep Hole Drilling And Boring Machine

                                             TSK2150 × 8 m CNC deep hole drilling and boring machine

Machine Tool Overview

Machine tool processing scope

Drilling range: Φ30 ~ Φ150 mm

Boring range: Φ40 ~ Φ500mm

Trepanning range: Φ120 ~ Φ400mm

Maximum machining depth: 8m

Maximum workpiece length: 8m

1.2 CNC Deep hole drilling and boring Machine tool functions

Machine tool working mode: workpiece rotates, tool does not rotate, tool feeds; Workpiece rotation, tool rotation, tool feed.

Drilling: BTA drilling method, cutting oil is supplied into the tool through the gap between the oil pressure head, the tool bar and the hole wall, and discharged through the inner hole of the tool bar with chips.

Boring: Cutting oil is fed into the tool through the gap between the oil pressure head, tool bar and hole wall, and is discharged through the bottom hole of the workpiece with chips. During machining, the tool moves close to the headstock.

Trepanning: internal oil supply and external chip removal. Cutting oil is supplied into the tool through the inner hole of the tool bar and discharged with chips through the gap between the outer wall of the tool bar and the hole

1.3 Main uses and overall layout of machine tools

The machine tool is specially designed to process deep holes of cylindrical and square workpieces. The machine tool bed has strong rigidity and good accuracy retention. It can be adapted to the inner hole machining of large workpieces. The spindle speed range is wide, and the feed system is driven by AC servo motor, which can meet the needs of various deep hole machining processes. The oil feeder servo jacks the workpiece.

1.3. 1 Main components of machine tools

Bed body,Headstock, oil pressure head, boring bar bracket, sliding guide rail, rack and pinion, cooling system, PLC control system, electric box, center frame, etc.

1.3. 2 Workpiece clamping

The chuck on the bed headstock clamps one end of the workpiece, and the conical disc on the oil pressure head tightens the other end of the workpiece

Workpiece clamping diagram

1.3. 3 Machine tool control system

Control system: PLC control system

Z1 servo axis: the longitudinal feed motion of the drill pipe box, and the servo motor drives the rack and pinion mechanism through the reduction mechanism.

Z2 servo axis: The oil feeder servo tightens the workpiece, and the servo motor drives the rack and pinion mechanism through the reduction mechanism.

1.3. 4 The basic parts such as 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.

1.3. 5 Bed body (section view)

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.

The width × thickness of a single guide rail = 180mm × 50mm, and the total width of the guide rail is 800mm;; The bed is equipped with a helical rack (modulus 6), which is used for tool feed transmission. The rack has been precisely machined and quenched to have high guiding accuracy and good wear resistance; The precision rack is installed in the middle of the bed guide for the feeding and quick movement of the pallet. The machine tool has large load capacity, sufficient rigidity and stable transmission.

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.

The periphery of the bed body is equipped with apron protection.

1.3. 6 Headstock

It is used to drive the workpiece to rotate, fixed at the left end of the bed body, manual 3 gears, stepless speed regulation in the gear, the motor drives the spindle to rotate through the coupling and gear box, and the front end of the bed head box is equipped with a manual chuck for clamping the workpiece.

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.

In order to improve the life of gears and bearings, lubricating oil circulation lubrication is used.

1.3. 7 Drilling part:

It is used to drive the workpiece to rotate. It is installed on the feed pallet and has 12-speed manual speed regulation. The motor drives the spindle to rotate through the coupling and gearbox. The tool holder connecting sleeve at the front end of the spindle is used to clamping the tool bar.

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.

In order to improve the life of gears and bearings, lubricating oil circulation lubrication is used.

The drill pipe box has two structural designs: rotating and fixed, which can lock the drill pipe box when the drill pipe is not needed to rotate.

1.3. 8 Closed center frame

For supporting workpieces; Three-point closed central frame structure, with two rollers below and one roller above, and the rollers are equipped with tapered roller bearings; The two rollers below adjust the lateral position by the lead screw; The position of the center frame on the bed guide rail is manually adjusted by rack and pinion. Mainly plays the role of supporting the workpiece. The closed center frame is an auxiliary device for workpiece clamping, which can be used for drilling slender shafts and machining large and long diameters of workpieces.

 

1.3. 9 Oil pressure head (spindle type structure)

Used for tool guidance, oil supply and 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. Machine tool cooling and hydraulic display instruments are installed on the front of the oil feeder, so that the machine tool can be dynamically displayed during processing, which is convenient for operators to judge the processing situation of the machine tool.

The servo motor is used to drive the oil pressure head to tighten or loosen the parts, with high precision and high rigidity; The oil feeder adopts a box structure as a whole, with high precision and high rigidity.

In order to facilitate the operation of the machine tool, the oil feeder has a unique design. It only needs to replace the corresponding cutting tools and auxiliary tools to realize the switching between drilling and boring. During the drilling or boring process, the oil feeder will not be caused by excessive oil pressure. The oil pressure head retreats.

 

1.3. 10 Feed system:

It is driven by a servo motor, and after the speed is changed by a reduction gearbox, the carriage plate is driven by gears and racks to realize the fast forward and working advance of the carriage plate. The feed is stepless speed regulation, and the speed regulation range is 0.5 ~ 1000mm/min.

1.3. 11 Tool Bar Support

Supporting the cutter bar and controlling the movement direction of the drill pipe; It adopts a high-rigidity integral structure, and is equipped with a support sleeve, which can absorb the impact, jitter, etc. generated during processing.

1.3. 12 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 displayed digitally on the control station.

1.3. 13 Electrical control system:

The main electrical components adopt Schneider brand, which is more stable and reliable. Greatly reduces the failure rate of the equipment and increases the stability of the machine tool.

1.3. 13 Chip discharge bucket: Recycle iron filings and cutting fluid to prevent cutting fluid from splashing.

When drilling, the internal chip removal method (BTA) is adopted. The cutting oil is supplied from the oi pressure head, enters the cutting area through the annular cavity formed by the outer edge of the drill pipe and the machined surface, takes the chips through the inner hole of the drill pipe to the back row (direction of the drill pipe box), enters the rear chip removal pipe, and flows into the chip receiving box.

When boring, the external chip discharge method is adopted. The cutting oil is supplied from the oil pressure head, enters the cutting area through the annular cavity formed by the outer edge of the drill pipe and the machined surface, takes the chips to the front row (the direction of the headstock), enters the front chip discharge bucket, and flows into the chip receiving box.

1.3. 14 Machine tool lubrication:

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 knife bar support support plate are lubricated by manual lubrication pump.

1.3. 15 Open center frame

For supporting workpieces;

The lower two rollers, the rollers are equipped with tapered roller bearings; The two rollers below adjust the lateral position by the lead screw; The position of the center frame on the bed guide rail is manually adjusted by rack and pinion. Mainly plays the role of supporting the workpiece. The center frame is an auxiliary device for workpiece clamping, which can be used for drilling slender shafts and machining large and long diameters of workpieces.

CNC deep hole drilling and boring machine Machine tool main parameters

Technical specifications			parameter	remark
Processing range	Range of drilling		Φ30 ~ Φ150mm
	Push boring range		Φ40 ~ Φ500mm
	Trepanning scope		Φ120 ~ Φ400mm
	Maximum machining depth range		0.5 m ~ 8m
	Workpiece length range		0.5 m ~ 8m
Machine tool performance	Z1 axis (feed carriage)	Feed speed range	0.5 ~ 1000mm/min	Stepless
		Servo motor	35Nm/5.5 KW	Servo motor
	Z2 axis (oil pressure head movement)	Fast moving speed	1.5 m/min
		Servomotor torque	27Nm/4.3 KW	Servo motor
	Headstock	Speed range	4 ~ 440r/min
		Motor power	45KW	Variable frequency motor
		Spindle front taper bore	Metric 140
		Chuck	Φ630mm	Manual 3-jaw
	Drill pipe box	Speed range	40 ~ 500r/min
		Motor power	30KW	Ordinary motor
	Cooling system	Maximum pressure	2.5 MPa
		Maximum flow rate	800L/min
		Tank volume	6600 litres
		Cooling motor power	7.5 KW, 3 groups 15KW, 1 group
	other	Height from center of spindle to above guide rail	625mm
		Maximum rotational diameter on bed	Φ1250mm
		Clamping diameter range of center frame	Φ100 ~ Φ750mm
		Total power of machine tool	138KW
		Machine tool load-bearing	20 tons
		Machine tool footprint	26m × 3.8 m
		Machine tool weight (approx.)	35 tons

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