Bta Deep Drilling

Machine Appearance:

Machine brief :

2.1 Machine processing capacity :

Drilling diameter range : Φ25~Φ100mm

Boring diameter range: Φ30~Φ100mm

Workpiece OD range : Φ60~Φ400mm

2.2 Machine functions :

Machine working mode : Workpiece rotate, cutting tool fix ; Workpiece rotate,cutting tool rotate in opposite direction and feed .

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

Push boring hole : The cutting oil is supplied to the tool through the oil pressure head and gap between the drill bar and hole wall, and discharged through the basic hole of workpiece . During processing,the cutting tool move to the direction close to the headstock .
2.3 Machine main structure:
2.3.1 Main parts of machine
Machine bed, headstock , oil pressure head, drill bar support rest , drill box , sliding guide rail , Rack and pinion, coolant system , control system , electric cabinet, workpiece carrier etc. .

2.3.2 Workpiece clamping
The manual three-jaw chuck on the headstock clamps one end of the workpiece, and the cone disc on oil pressure head automatically tightens the other end of the workpiece. .

Workpiece clamping sketch
2.3.3 Machine control system
CNC system : DELTA PLC
Z axis：The longitudinal feed movement of the drill box, the servo motor drives the rack and pinion mechanism through the reducing mechanism.
X axis: Oil pressure head servo tighten the workpiece , the servo motor drives the rack and pinion mechanism through the reducing mechanism.
2.3.4 The machine bed , box body, carriage etc. basic parts are precisely cast by super casting iron, processed by twice aging treatment after casting ,to eliminate stress , stable the structure and size , improve the mechanical properties ,etc. .
2.3.5 Machine bed :
The machine bed is made of resin sand and normalised after casting. The bed adopts split structure, assembled with high strength bolts and positioned by cone pin.
Adopt double rectangular sliding guide rail, precision grinding, the guide rail surface is with high quenching hardness .
The helical rack which is treated by precision processing and quenching is mounted inside of machine bed ,used for cutting tool feeding transmission . The machine has large bearing capacity, good rigidity and stable transmission.
The V-shaped slant reinforced ribs are distributed inside of the machine bed , supporting strength is high, and it is not easy to deform; The outer wall of machine bed support the guide rail directly, so the guide rail could bear large cutting force, with good rigidity, not easy to deform and vibrate during machining, it is good for improving the processing quality and working efficiency of machine .
The oil returning slot mounted with oil shield is cast around the machine bed , so that the cutting oil on machine bed will return the coolant tank automatically .
2.3.6 Headstock :
Used to drive the workpiece to rotate, fixed on the left end of machine bed .
The spindle speed is stepless ,the servo spindle motor drives the spindle to rotate through belt and gear box , the manual three-jaw chuck is installed in front of headstock for clamping the workpiece .
The gears are machined by precision grinding , gear surface is quenched by 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 load and shock load.
The external lubrication oil tank is used for circulating lubrication of gears and bearings, and a low liquid level alarm device is installed inside the oil tank.
Install a button board on the headstock box, which has functions such as spindle jog, feed forward, feed backward, and emergency stop.

Headstock Appearance
2.3.7 Oil pressure head
Used for guiding the cutting tool, supplying cutting oil and supporting the drill bar .
Servo motor drives its axial movement to adapt the workpiece with different length, and to tighten and loosen the workpiece .The servo motor can work under torque mode or position mode .
The rotary bearings of oil pressure head are installed inside of the oil pressure head box, with good rigidity and high rotation accuracy .
The rotary seal is installed on the outside of the right end of the oil pressure head body for easy maintenance.
The drill bar support sleeve in installed on the right end of oil pressure head for supporting the drill bar .
The guide sleeve ,cone disc and oil shield are installed on left end of oil pressure head , cone disc is used for positioning the workpiece, and guide sleeve is for guiding the direction of cutting tool .
The oil shield is push-pull structure,the oil retention is mounted under the oil shield ,so that the cutting oil can return the oil tank .

2.3.8 Drill box

Used to drive the cutting tool to rotate, installed on the feeding carriage .

The speed of spindle is stepless, the servo spindle motor drives the spindle to rotate through belt,belt pulley and gear box .

The tool shank connection sleeve at left end of spindle for clamping the cutting tool.

The chips removal bucket is installed at the right end of spindle for discharging the cutting chips .

The gears are machined by precision grinding , gear surface is quenched by 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 load and shock load.

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

Drill box appearance sketch

2.3.9 Drill bar support rest
Used to support the drill bar ;
Adopt a integrate structure with high rigidity , the support sleeve is mounted on it , which can absorb the impact, vibration, etc. generated during the processing.
Install an automatic hanging mechanism. When returning the tool, the feeding carriage can automatically pull the drill bar support rest back to its initial position.

Drill bar support rest appearance sketch
2.3.10 Coolant system :
Mainly composed of Cooling pump,chips box,oil tank etc. ,to supply enough cutting oil for deep hole processing .
Oil tank : Install on floor, doesn't need to dig a pit , and the oil tank is fully welded with the super steel sheet .
Install a retractable protective cover between the chips boxes on the oil tank to prevent debris from falling into the tank.
The pressure, liquid level, oil temperature, and flow rate of cutting oil can be displayed

digitally on the control station .

Coolant system sketch

2.3.11 Feeding carriage

Used for driving the cutting tool to move axially .

Lubricate the sliding guide surface timely and quantitatively with an auto lubrication station .

The button board is mounted on the carriage ,which has functions of drill box spindle jog,

feeding forward, feeding backward, emergency stop.

2.3.12 Lubrication system

The sliding guide rail surface of the feeding carriage adopts automatic lubrication station for timed and quantitative lubrication, with a low liquid level alarm function .

The bearings and gears of the headstock are circulating lubricated by an independent external oil tank, and have a low liquid level alarm function.

The bearings and gears of the drill box are circulating lubricated by an independent external oil tank, and have a low liquid level alarm function.

The oil pressure head carriage, drill bar support rest carriage are lubricated by manual

lubricating pump .

2.3.13 Workpiece carrier

Used for workpiece pre-positioning .

The operator places the workpiece on the workpiece carrier first, and after the workpiece is clamped and positioned, the workpiece separate with the carrier.

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

Workpiece carrier sketch

2.3.14 Center rest

Used to support the workpiece; Three-point closed center rest structure, two rollers blow and one roller on the top ; The horizontal positions of below two rollers is adjusted through the screw.

Machine main parameters:

Specification			Parameters	Remark
Working capacity	Drill diameter range		Φ25~Φ100mm
	Boring diameter range		Φ30~Φ200mm
	Max. processing depth /workpiece length range		5000mm
	Workpiece OD range		Φ60~Φ400mm
Machine performance	Z axis (Drill box feed)	Feed speed range	5~1000mm/min
		Rapid move speed	2000mm/min
		Servo motor torque/power	20Nm/3.1KW
		Max. Feed force	60KN
	X axis (Oil pressure head movement)	Rapid move speed	2000mm/min
		Servo motor torque	20Nm/3.1KW
		Max. tightening force	60KN
	Drill box	Rotation speed range	30~1000r/min
		Motor power	37KW	Servo spindle motor
	Headstock	Rotation speed range	30~1000r/min

		Motor power	37KW	Servo spindle motor
		Chuck OD	Φ400mm	Manual three-jaw
	Others	Machine total power	89KW
		Guide rail width	600mm
		Loading weight	3000kgs
		Floor size	16m×3.3m
		Height from spindle center to guide rail upper surface	400mm
Coolant system		Max. pressure	2.5MPa
		Max. flow	300L/min
		Oil tank volume	5000L

 

4.Machine main configurations list:
Main purchased parts name Manufacturer
Control system DELTA PLC
X axis used servo motor Chinese famous brand (MAXSINE)
Z axis used servo motor Chinese famous brand (MAXSINE)
Main motor of headstock Chinese famous brand (MK)
Main motor of drill box Chinese famous brand (MK)
Coolant pump used motor Chinese famous brand
Main electric components SCHNEIDER or SIEMENS
Spindle bearings of drill box HRB/ZWZ/LYC
Spindle bearings of headstock HRB/ZWZ/LYC
Coolant pump Chinese famous brand
Rack Taiwan YYC
Chuck of headstock Chinese famous brand

Machine standard parts :

No.	Name	QTY	Remark
1	Machine bd	1set
2	Drill box	1set
3	Headstock	1set
4	Three-jaw manual chuck of headstock	1set
5	Workpiece carrier	2set
6	Oil pressure head	1set
7	Coolant system	1set
8	Feeding carriage	1set
9	Lubrication system	1set
10	Control system	1set
11	Electric cabinet	1set	With air-conditioner
12	User Manual	1set
13	Drill bar support rest	2set
14	Center rest	1set

Optional parts:

No.	Name	Model
1	Cutting tool	ΦD
2	Drill bar	Φd
3	Auxiliary tools	Φd
4	Guide sleeve	ΦD
5	Cone disc	Match with workpiece OD
6	Cutting oil	5000L
7	Chain plate auto chips conveyor	Width 500
8	Oil chiller for cooling system	Cooling capacity 12KW
9	Paper type drum filter for cooling system	Filtering accuracy 50μm

 

Machining accuracy:

7.1 Push boring and drilling hole :

Hole size accuracy : IT9~IT11

Surface roughness : Ra6.3~ Ra 12.5μm

Hole skewness: 0.4mm/1000mm

7.2 Fine boring hole :

Hole size accuracy: IT8~IT9

Surface roughness: Ra1.6-3.2μm

Documents provided :

Mechanical user manual	1set
Electrical user manual	1set
PLC program backup	1set
Machine appearance sketch and foundation drawing	1set
Packing list	1set
Certificate of Conformity	1set

 

Machine manufacturing and inspection standards:

Standard	Item
GB/T 9061-2006	General technical specifications for metal cutting machine
GB/T 5226.1-2019	Mechanical and electrical safety - Mechanical and electrical equipment - Part 1: General technical specifications

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