cnc introduction
TRANSCRIPT
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Dr. D. Y. PATIL SCHOOL OF ENGINEERING&TECHNOLOGY
INTRODUCTION OF COMPUTER NUMERICAL CONTROL MACHINE (CNC)
By,)
Under the guidance of,Prof..
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INTRODUCTION CNC Machines What
is a CNC Machine?CNC : Computer and Numeric Control
Conventionally, an operator decides and adjusts various machines parameters like feed , depth of cut etc depending on type of job , and controls the slide movements by hand. In a CNC Machine functions and
slide movements are controlled by motors using computer programs.
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Basic CNC Principles
•Each axis consists of a mechanical component, such as a slide that moves, a servo drive motor that powers the mechanical movement, and a ball screw to transfer the power from the servo drive motor to the mechanical component.
• CNC can control the motions of the workpiece or tool, the input parameters such as feed,depth of cut, speed, and the functions such as turning spindle on/off, turning coolant on/off.
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Features of CNC Machinery
• The tool or material moves.• Tools can operate in 1-5 axes.• Larger machines have a machine control unit (MCU) which manages
operations.•Movement is controlled by a motors (actuators).• Feedback is provided by sensors (transducers)• Tool magazines are used to change tools
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APPLICATION• In the machine tool category, CNC is widely used for,
1. Lathe2. Drill press3. Milling machine4. Grinding unit5. Laser Cutting6. Sheet-metal press7. Tube bending machine etc.
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TOOLS USED IN CNC
•Most are made from high speed steel (HSS), • tungsten carbide or ceramics.• Tools are designed to direct waste away from the material.• Some tools need coolant such as oil to protect the tool and work.
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ADVANTAGES
1. high accuracy in manufacturing2. short production time3. greater manufacturing flexibility4. simpler fixturing5. contour machining (2 to 5 –axis machining)6. reduced human error
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DISADVANTAGE
1. Costly setup2. Skilled operators3. Computers, programming knowledge required4. Maintenance is difficult
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Thank You