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Chipping Machining Table of contents - Classification of chipping machining - The cutting edge - How to choose proper cutting angles - Properties of cutting-tool.

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Presentation on theme: "Chipping Machining Table of contents - Classification of chipping machining - The cutting edge - How to choose proper cutting angles - Properties of cutting-tool."— Presentation transcript:

1 Chipping Machining Table of contents - Classification of chipping machining - The cutting edge - How to choose proper cutting angles - Properties of cutting-tool materials - Survey of cutting-tool materials

2 Classification of chipping machining Main group 3 Cutting operations With geometrically undefined cutting edges With geometrically defined cutting edges Turning MillingDrilling Shaping Broaching Grinding Honing Lapping

3 The Cutting Edge... clearance angle... wedge angle... rake angle workpiece chip Cutting tool wedge

4 How to choose a proper clearance angle small: 4° to 5° big: 8° to 10° Used for - high alloyed steel - hardened steel - short chipping materials Used for - aluminium, copper - clastics - long chipping materials... clearance angle : 5° to 8° Standard for steel and casting alloys

5 How to choose a proper rake angle high positive 15° to 30° positive 5° to 15° much cutting force needed great chip bending Used for high alloyed steel, hardened steel Little cutting force needed easy chip removal Used for aluminium, copper, plastics... rake angle negative -5° to -25° Standard for steel and casting alloys

6 How to choose a proper wedge angle big small strong cutting edge Used for high alloyed steel, hardened steel rough machining weak cutting edge Used for Aluminium, Plastics finishing operations... wedge angle Depends on and

7 Cutting-tool materials Properties - Hardness: Sufficient hardness to resist wear and give an adequate life - Hot hardness: The ability to retain its hardness at high temperatures generated at the tool point when cutting - Compression strength: To avoid deformation and edge chipping - Oxidation and diffusion resistance: To avoid build up edges and cratering - Bending stability and ductility: To avoid insert breakage - Resistance to temperature changes: To avoid insert fracture and breakage Wear resistance Toughness

8 Cutting-tool materials Toughness Wear resistance Ideal cutting-tool material ceramics high-speed steels (HSS) coated uncoated Cemented carbide (hard metal) coated uncoated high-carbon steels diamond poly crystalline boron nitride (PKB), cubic boring nitride (CBN)

9 Vocabulary chipping machiningSpanende Fertigung cutting edgeSchneide cutting tool wedgeSchneidkeil turning, to turnDrehen, drehen milling,to millFräsen, fräsen drilling,to drillBohren, bohren shaping, to shapeStoßen, stoßen broaching, to broachRäumen, räumen grinding, to grind-ground- groundSchleifen, schleifen honing, to honeHonen, honen lapping, to lapLäppen, läppen rake angleSpanwinkel clearance angleFreiwinkel wedge angleKeilwinkel chipSpan alloyed steellegierter Stahl hardened steelgehärteter Stahl roughing, to roughSchruppen, schruppen finishing, to finishSchlichten, schlichten casting alloysGusswerkstoffe hot hardnessWarmhärte wear resistanceVerschleißfestigkeit compression strengthDruckfestigkeit toughnessZähigkeit bending strengthBiegefestigkeit service lifeStandzeit wearVerschleiß edge chipping Ausbröckeln der Schneide crateringKolkverschleiß insert breakagePlattenbruch fracture, crackRiss tool pointWerkzeugspitze coatedbeschichtet tungstenWolfram cemented carbide, hard metalHartmetall poly crystalline boron nitridepolykristallines Bornitrid


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