Small Hole Deep Hole Drilling Machine

Machine tool appearance diagram

 

For reference only, the actual product shall prevail

Machine Tool Overview

2.1 Machine tool processing scope

Drilling range: Φ20 ~ Φ60mm

Workpiece outer diameter range: Φ140 ~ Φ200mm

Workpiece length range: 900-4500mm

During machining, the workpiece is fixed, and the tool is rotated and fed; The workpiece is self-centered and automatically clamped by hydraulic fixtures.

Used for center hole drilling machining of blank tubes.

2.2 Machine tool functions

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.

 

2.3 Main structure of machine tool

2.3. 1 Main components of machine tools

Bed body, tailstock, oil pressure head, tool bar bracket, drilling box, sliding guide rail, gear rack and pinion, cooling system, control system, electric box, workpiece carrier, center frame, etc.

2.3. 2 Workpiece clamping

The workpiece carrier is automatically lifted → the workpiece is placed on the workpiece carrier → the oil sealing pan is installed on the tailstock and oil pressure head to automatically tighten both ends of the workpiece → the center frame automatically clamps the workpiece → the workpiece carrier automatically falls down.

 

Workpiece clamping diagram when drilling

2.3. 3 Machine tool control system

Control System: SIEMENS-808D

Z-axis: longitudinal feed motion of drilling box, servo motor drives ball screw through servo reducer.

2.3. 4 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.

2.3. 5 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.

A ball screw is installed in the bed body, which is used for cutter feed 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.

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.

 

 

2.3. 6 Tailstock

Function: clamping workpieces and sealing oil.

Installed at the far left end of the machine tool, the hydraulic motor drives the tailstock to move axially through the turbine worm mechanism, rack and pinion.

2.3. 7 Oil pressure head

Used for tool guidance, oil supply and support;

The oil Pressure head is installed in the middle of the bed, and the oil pressure head moves axially under the control of the hydraulic system to tighten and loosen the workpiece.

Install the tool bar support sleeve 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 and a conical disc, the conical disc is used for positioning the workpiece, and the guide sleeve is used for guiding the tool.

 

2.3. 8 Drill pipe box

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

The servo spindle motor is used to drive the spindle to rotate through the belt and pulley, and the speed is stepless.

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

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

The main motor front drives the spindle to rotate, and the tail end of the motor is far away from the tool handle connecting sleeve, which is beneficial to prevent the motor from entering oil, improve the life of the motor, and facilitate the replacement of tools.

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

 

Appearance diagram of drilling box

2.3. 9 Drilling bar support

For supporting the drilling 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.

At the same time, a manual adjustment gear is installed on the bracket, and the position of the drilling bar bracket on the bed body can also be manually adjusted.

 

Appearance diagram of tool bar holder

2.3. 10 Cooling System:

It is mainly composed of cooling pump, chip conveyor machine, oil cooler, filter, oil tank, etc., which provides enough cutting oil for deep hole processing.

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

Chip conveyor machine: remove chips and achieve preliminary separation of oil chips.

Oil chiller: Control the oil temperature within a reasonable range. When the oil temperature is higher than the set upper limit, the oil cooler will start automatically; When the oil temperature is lower than the set lower limit, the oil cooler automatically stops.

Filter: It adopts paper belt filtration and has automatic paper feeding function to improve the cleanliness of cutting oil.

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

 

Cooling system diagram

2.3. 11 Feed pallet

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.

2.3. 12 Lubrication system

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

Drill pipe box bearings adopt automatic lubrication station for regular and quantitative lubrication, with low liquid level alarm function..

The oil feeder support plate, the knife bar bracket support plate and the tailstock support plate are lubricated by manual lubrication pump.

2.3. 13 Workpiece carrier

Mounted on center frame for workpiece pre-positioning.

It consists of two parts: hydraulic lifting and manual lifting.

First adjust the height of manual lifting; Hydraulic lifting lifts the workpiece to the center of the spindle, and the hydraulic lifting part automatically falls down during processing

Workpiece carrier schematic diagram

2.3. 14 Center frame

Used to clamp workpieces and hold them in place.

The hydraulic motor controls the rotation of the ball screw with positive and negative φ63 specifications, thereby driving the clamping jaws to move radially at the same time to realize the clamping and loosening of the workpiece.

A manual gear is installed on the upper side of the workpiece bracket, and the rack on the bed body can be used to realize the movement of the workpiece bracket on the bed body; Fixed on the bed guide rail by manual locking block.

 

 

Machine tool main parameters

Technical specifications			parameter	remark
Scope of work	Range of drilling		Φ20 ~ Φ60mm
	Machining depth/workpiece length		900 ~ 4500mm
	Workpiece outer diameter range		Φ140 ~ Φ200mm
Machine tool performance	Z axis (drilling box feed)	Feed speed range	5 ~ 1000mm/min
		Fast moving speed	2000mm/min
		Servo motor torque/power	27Nm/4.3 KW
		Maximum feed force	60KN
	Drilling box	Speed range	30 ~ 1500r/min
		Motor power	37KW	Servo spindle motor
		Spindle taper bore	Metric 80
	other	Total power of machine tool	62KW
		Width of guide rail	490mm
		Machine tool footprint	13.5 m × 3.2 m
		Maximum workpiece weight	1 ton
		Height from center of spindle to above guide rail	240mm
Cooling system		Maximum pressure	2.5 MPa
		Maximum flow rate	200L/min
		Fuel tank volume about	3700L

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