Estudo de caso: The customer had to make controlled chamfer on drilled hole of an Aluminum components. The chamfer had controlled depth for rivet seating. The depth control on the chamfer had to be mainatained within 30 microns for correct. The sustomer was using an hand operated drilling machine with mechanical dead stop. The depth control was very difficult in this setup and was set up time was. This now has been replaced by our machine which has a 1.5HP spindle with 500-2800 RPM stepless speed variation through VFD interface. The depth, feed and rapid return of the tool is by the servo motor coupled to ballscrew. The touch screen HMI can be used to program the spindle speed, drill feed, rapid return and dwell.

Other uses of this machine: Since this has an accurate depth control, this can be used in place of expensive CNC drill/tap centers. This machine can be used for even tapping with a compensatory tapping chuck. Different fixtures have to be made to align the hole position to the spindle position. After fixture setup, the machine can be used in continuous auto-cycle for mass production.

TECHNICAL SPECIFICATION:

 

Machining Capabilities
Drilling Capacity	Solid drill of Ø20 mm
Tapping Capacity	M12 with compensatory chuck
Vertical Stoke
Stroke	250 mm
Guideway details	Ground LM guides and blocks. Size 25.
Rapid traverse rate	6,000 mm/min
Feed traverse rate	30-3,000 mm/min
Motor Power	2.4 Nm with brake
Drive system	Servo driven coupled to ballscrew
Ball Screw	Ø36, 5 pitch, C3 class, ground and preloaded
Positional Accuracy	±10µm for 300 mm.
Repeatability	10µm
Slide end stop limit switch arrangement	Limit Switches
Slide cover protection	Collapsible bellows.
Spindle Head & Spindle drive
Taper of spindle	IS0-30
Arbour clamping system	Manual draw bar with nut
Tool Clamping system	ISO-30 x ER-16 collet arbour
Spindle Bearing configuration	Match pair angular contact bearings
Spindle speeds	500 – 2800 RPM
Spindle drive	V-Belt and pulley driven
Main Spindle motor rating	1.5HP AC induction motor routed through VFD
Coolant system	Not provided
Spindle Runout (Axial and radial)	Within 10 µm
BOUGHT-OUT
Operators control station	Will be provided
Servo Motors	Mitsubishi
PLC	Mitsubishi
VFD	Mitsubishi
HMI – Touchscreen	7” touchscreen – Mitsubishi
Spindle Motor	ABB
Limit Switches	Siemens/Teknic
Major Switchgear elements	Schneider/Siemens
Bearings	SKF/RHP/FAG
LM guides	HIWIN
Ballscrews	HIWIN
Cables	Finolex

 

Video: