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PM Bill 3 - Coggle Diagram
PM Bill 3
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Welding
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Weldabiliy
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Martensite is undesirable in the weld, C<0.4%
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Machining
Shearing material away from a parent block using a single point tool. Chip then is in contact with face of tool and causes secondary deformation causing temps of 827C
Development of tools
Hardness, toughness, chemical inertness, wear resistance
Usually made from steel, with Mo and W added to increase hardness. Rapid cooling is also used to increase hardness, wear resistance and toughness
Cermets: Carbides in amounts >30% bonded with metal powder. :red_cross: can disolve in the tool at high temps
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Production Rate
Part handling, machining and tool change time combine to produce production rate
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Heat treatment
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Products
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Pearlite
Cementite nucleates on autenite grain boundary, ferrite nucleates adjacent, plates grow cooperatively into grain interior
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Hardenability
Adding alloying elements to prevent diffusion based transformations (push pearlite and bainite noses to the right)
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Chips and tools
Tool life
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- Steady state wear (uniform wear - desirable)
- Failure region (accelerated wear until failure)
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