Used a conventional lathe.
Manual 3 jaw chuck.
Feeding HSS pilot drill manually
Feeding HSS finish drill manually. .
Heat treating the material and then boring using a VMC
Total machining time of....
Heat treating the material and then boring using a VMC
Total machining time of 20-30 minutes.
Features and Specs:
Heavily ribbed, fabricated and stress relieved structure.
Atop the base, a stationary fixture is provided. The fixture consists of V blocks and hydraulic clamps to clamp the component.
On one side the fixture, drilling head is mounted on hydraulic cross slides. Sliding surfaces is made of LM guideways and blocks. The slide has a stroke of 300 mm.
The drilling head is driven by a 20HP motor connected to the spindle through timer belt and pulley mechanism.
The drilling head’s motor are routed through VFD for stepless speed variation from 300-1500 RPM.
The slide is driven through a servo motor which is coupled to a ballscrew through a 1:4 ratio servo reducer to provide feed rates of 10mm/min to 7500mm/min.
The machine is provided with spindle through coolant and chip flushing.
The machine will be provided with complete machine enclosure.
The machine will be provided with PLC programmed auto-cycle. A touch screen HMI will be provided for machine parameter setting and trouble shooting.
Sequence of Operation:
Load the component on the fixture and press auto-cycle.
The component gets clamped.
Through coolant is switch on. The drilling head spindle starts, drills the component with 3 pecking cycles and retracts. Spindle stops
The finish drilling head moves, drills the component to the finish bore and retracts. Spindle and coolant stops
The component clamp disengages.
Cycle Time:
The cycle time of the machine from component clamp to unclamp condition consider the bore diameter Ø44x220mm is 180 seconds
Final Conclusion:
Lathe:
Component setup time is high.
Machining time is high
Need of skilled operators.
Due to manual feeding, operation is prone to operator’s fatigue, which may lead to loss in efficiency of production.
Even though tooling cost is less, considering the machining time, operator’s salary, the overall cost is more.
U-Drilling and Boring SPM:
No need of skilled operator. Cost of skilled operators is reduced.
Uses U-drills with indexable inserts. Cost of tooling is reduced.
The total drilling time is 3 minutes, instead of 15-20 minutes on a lathe. Efficiency is more than 6 times. Increases the productivity, increases profitability, increases the scrap generation rate.
Machine provided with adjustable V blocks and clamps, which can accommodate a variety ofÂ
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