CNC MACHINE

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developments in machines

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PowerPoint Presentation: 

DEVELOPMENTS IN NC MACHINES

INTRODUCTION: 

INTRODUCTION NC machines are the most standardized form of manufacturing the parts required to produce a product and The earliest CNC machines received code instructions through hard-wired controllers, which meant that the programming format could not be altered in 1970 s and in this presentation we can see developments in the tools, tool holding devices, work holding devices, machining technique, and reference measurement etc

ELEMENTS OF A NC SYSTEM: 

ELEMENTS OF A NC SYSTEM PROGRAMMING TOOLING MACHINING TOOL HOLDING WORK HOLDING REFERENCE MEASURING IN PROCESS INSPECTION

1. PROGRAMMING SYSTEMS: 

1. PROGRAMMING SYSTEMS O0013 N0005 G53 N0010 T0404 N0020 G57 G00 X26.00 Z0.0 S500 M04 N0030 G01 X-0.20 F100 G01 Linear interpolation (cutting) X-0.20 Move only in x direction until you pass the center by 0.1 mm (facing) F100 Set feed rate to 100 mm/min. G00 Move rapidly away from work piece (no cutting) to location x= 23.0 (11.50 from zero) and z = 2.0. APT Program Interpretation

PowerPoint Presentation: 

Automatic Part Programming: Developments Software can generate program automatically from model Make 3D model Define Tool CNC data Simulate cutting Part program Generation and Machining

PowerPoint Presentation: 

Automatic part programming and DNC Very complex part shapes  very large NC program NC controller memory may not handle HUGE part program computer feeds few blocks of NC program to controller When almost all blocks executed, controller requests more blocks

2. DEVELOPMENTS IN TOOLING : 

2. DEVELOPMENTS IN TOOLING HSS TOOLS POLY CRYSTALLINE DIAMOND TOOLS CEMENTED CARBIDE

3. Conventional machining: 

3. Conventional machining Rough – machining and semi finishing with the material in a soft i state (30-40hrc) Heat treatment to obtain the required hardness (55-60hrc) Electron discharge machining of particular zones of the die or of the matrix with very small rays or very deep cavities Finishing of the remaining part of the die Manual working to obtain the geometry and accuracy required manual polishing

HIGH SPEED MACHINING: 

HIGH SPEED MACHINING High speed rough machining and semi finishing with the material in a solid state (30-40hrc) Heat treatment to obtain required hardness (55-60hrc) High speed finishing and super finishing with the tool suitable for the specified material

DEVELOPMENTS IN PROGRAMMING: 

DEVELOPMENTS IN PROGRAMMING Cutter dia: 63mm (3/4th used) Depth of cut: 6mm Spindle speed: 800 rpm Feed rate: 0.6 meters/min Metal removal rate: 170cm 3/min Cutter dia: 63mm (3/4th used) Depth of cut: 2mm Spindle speed: 2800 rpm Feed rate: 3.8 meters/min Metal removal rate: 243cm 3/min High speed machining Conventional machining

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HSK : Hohl Shaft Kegel (German) Means Hollow Shank Taper Using centrifugal force principal and through coolant holders USED FOR SPEEDS <10000 4. DEVELOPMENTS IN TOOL HOLDING DEVICES BT -50\40 HOLDER USED FOR SPEEDS >10000

5. WORK HOLDING DEVICES: 

5. WORK HOLDING DEVICES

DEVELOPMENTS IN WORK HOLDING DEVICES: 

DEVELOPMENTS IN WORK HOLDING DEVICES Hydraulic clamping Pneumatic clamping Vacuum clamping Magnetic clamping

6. REFERENCE MEASURING: 

6. REFERENCE MEASURING Dial gauge : Used for dialing the fixtures and taking references of the work pieces Touch probe : Used for taking References of the work pieces Which directly enters the reference values in the work Coordinates of the machine

7. INPROCESS INSPECTION: 

7. INPROCESS INSPECTION The touch probe can inspect the preprogrammed dimensions in the machine itself and the dimensional Report can be saved and even taken a Print out.

PowerPoint Presentation: 

NC MACHINE OF 1970’s LATEST 5-AXIS CNC MACHINE 5-AXIS MACHINE AT DIFFERENT ORIENTATIONS