CNC Broaching Machine

1. Machine appearance sketch:

2. Overview of machine:

2.1 Machine application

Grooving machining of coaxial holes for cylindrical workpieces.

The tool can be expanded and contracted (X axis), the workpiece can be indexed and rotated (C axis), and the tool can reciprocate (Z axis); The broaching of the inner hole is completed by using the expansion and contraction cutter and the two-axis linkage of Z-axis and
C-axis.

A through-type headstock is adopted, and chucks are installed at both ends of the headstock; Hydraulic center rest and headstock chucks combination for clamping workpieces.

3. Main parameters of machine :

 

Technical specifications			Parameter	Remark
Working capacity	Hole diameter range		Φ20~Φ50mm
	Workpiece length range		1000-3000mm
	Max. machining depth		3000mm
	Workpiece OD range		Φ30~Φ100mm
Machine performance	Z-axis (tool feed)	Feed speed range	5 ~ 500mm/min
		Fast moving speed	8000mm/min
		Servo motor	48Nm/7.7 KW
		Linear guide rail specifications	45
		Linear guide form	Roller heavy-duty linear guide
		Ball screw for transmission	φ 80 × 20 mm
		Ball screw nut	Double nut
		Max. feed force	60KN
	U-axis (oil	Fast moving speed	8000mm/min

 

	pressure head movement)	Servo motor	16Nm/2.6 KW
		Linear guide rail specifications	45
		Linear guide form	Roller heavy-duty linear guide
		Ball screw for transmission	φ 50 × 10 mm
		Ball screw nut	Double nut
		Max. tightening force	30KN
	Headstock (workpiece indexing)	Max. rotation speed	10r/min	Stepless
		Servo motor	16Nm/2.6 KW × 2
		Indexing accuracy	30″
		Chuck Specifications	φ 400 mm × 2 Manual three-jaw self-centering chuck
		Chuck inner bore, spindle inner bore	φ130mm
Cooling system	Max. pressure		5MPa	Adjustable
	Max. flow rate		100L/min	Adjustable
	Oil pump/motor		7.5 KW variable frequency gear pump, 1 set
	Tank volume		1000L
	Filtering form		Drum paper filter
	Filtration capacity		200L/min
	Filtration accuracy		20 μm
	Oil chiller cooling capacity		5KW
other	Total machine power (approx.)		26KW
	Total machine weight (approx.)		14T
	Machine footprint		9.5m×3.5m

4. Machine structure description:

4.1 Tool expansion and contraction

The cutter expansion and contraction device installed on the reciprocating carriage pushes the inner core rod of the tool bar to move axially, the core rod is installed on the cutter body, and the inclined surface on the cutter body drives the cutter to move radially.

4.2 Workpiece clamping

The workpiece passes through the inner hole of the headstock spindle → chucks at both ends of the headstock spindle clamp the workpiece → hydraulic center rest clamps the workpiece → oil pressure head tighten the left end of the workpiece.

4.3 Oil circuit

The cutting oil enters through the oil pressure head, carries the chips through the basic hole of the workpiece, enters the chips removal bucket, and then discharges into the chips
conveyor.

4.4 Reciprocating movement of the cutter

The servo motor drives the ball screw through the servo reducer to realize the reciprocating motion of the cutter.
The nut on the ball screw is a double nut structure, which is lubricated regularly and quantitatively by automatic lubrication station.
Both ends of the screw are installed with special bearings for the screw, which adopt a bearing structure with one end fixed and one end stretched.

4.5 Support rest of tool bar

The support sleeve installed on the tool bar support rest is used to support the tool bar to enhance the rigidity of the tool bar.
The tool bar support rest is mounted on two linear guide sliders and can automatically adjust the spacing with the movement of the drill box.

Appearance diagram of tool bar support rest

Follow-up diagram of tool bar support rest

4.6 Indexing of workpiece

The workpiece is driven by the headstock to rotate and index, and the rotating speed of the workpiece is stepless and adjustable.

Two servo motors drive the spindle to index and rotate with C-axis function.

The headstock is fixed on the bed body of the machine, and manual three-jaw self-centering chucks are installed at both ends of the spindle.

Through-type headstock, the workpiece passes through the inner hole of the spindle, and the chucks at both ends is used to clamp the workpiece.

Sketch of headstock appearance

4.7 Cooling system

It consists of magnetic chips conveyor, circulating pump, drum paper filter, oil chiller, pump group, liquid level sensor, flow sensor, pressure sensor, temperature sensor and oil tank.

The pump unit is driven by a variable frequency motor, and the output flow rate of the pump is adjusted by adjusting the speed of the motor. The oil outlet of the pump is equipped with a manual relief valve to adjust the output pressure of the pump.

Various sensors are installed on the cooling system, and the liquid level, oil temperature, flow rate and pressure are displayed on the instrument.

Cooling system schematic diagram
4.8 Control system

CNC system: SIEMENS-828D

Mainly used for control: Cutter reciprocating movement, workpiece indexing rotation, cooling system, lubrication system, oil pressure head movement, hydraulic center rest, C-axis and Z-axis two-axis linkage, etc.

4.9 Lubrication system

The linear guide rail sliders of oil pressure head and reciprocating carriage, screw nut and headstock spindle are lubricated regularly and quantitatively by automatic lubrication station.

4.10 Machine safety guard (optional)

Can be designed and manufactured according to user requirements

4.11 Oil pressure head

It is used for supplying cutting oil to the cutter and can move axially under the control of CNC system;
When loading and unloading workpieces, the oil pressure head moves to the left end of  the bed to give up space and facilitate loading and unloading workpieces.

During processing, the oil pressure head is tightly tightening on the left end of the workpiece, which plays the role of oil sealing and workpiece positioning.

5. Standard parts of machine

No.	Name	QTY
1	Bed body	1 set
2	Reciprocating carriage	1 set
3	Headstock	1 set
4	Oil pressure head	1 set
5	Workpiece carrier	2 sets
6	Tool bar support rest	2 sets
7	Cooling system	1 set
8	Cutter feed system	1 set
9	Lubrication system	1 set
10	SIEMENS-828D Control System	1 set
11	Electric box (with air conditioner)	1 set
12	User Manual	1 set
13	Hydraulic center rest	1 set
14	Hydraulic station	1 set
15	Chip removal bucket	1 set
16	Cutter expansion and contraction device	1 set

 

7. Machine main configurations:

Item Name Manufacturer
CNC system
Servo feed motor
Spindle bearing for headstock
Linear guide rail
Ball screw
Chuck Zhejiang YUAN brand
Hydraulic center rest Yantai

9. Machine protection measures:

Machine lubrication oil deficiency protection
Cooling system level and pressure protection
Feed motor load protection
Cooling pump motor fault alarm
Limit protection

10. Documents provided:

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

6. Machine Optional parts:

Cutter, auxiliary tools, cutting oil

 

 

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