ME305 Manufacturing Techniques
Fall 2016/17
WEEK 10
Machining Processes
and Machine Tools
1
,Machining as a Process
The Necessity
• Parts manufactured by the casting, forming, and shaping
processes described in previous chapters, including
many parts made by near-net or net-shape methods,
often require further operations before the product is
ready for use.
2
,Machining as a Process
Consider, for example, the
following features on parts
and whether they could be
produced by the processes
discussed thus far:
• Smooth and shiny surfaces,
such as the bearing
surfaces of the crankshaft.
A forged crankshaft before and after machining the bearing surfaces. The
shiny bearing surfaces of the part on the right cannot be made to their final
dimensions and surface finish by any of the processes described in previous 3
chapters of this book. Source: Courtesy of Wyman- Gordon Company.
, Machining as a Process
• Small-diameter deep holes in a part such as the
injector nozzle.
Cross-section of a fuel-injection nozzle, showing a small hole made by
the electrical-discharge machining process. The material is heat-
treated steel. 4
Fall 2016/17
WEEK 10
Machining Processes
and Machine Tools
1
,Machining as a Process
The Necessity
• Parts manufactured by the casting, forming, and shaping
processes described in previous chapters, including
many parts made by near-net or net-shape methods,
often require further operations before the product is
ready for use.
2
,Machining as a Process
Consider, for example, the
following features on parts
and whether they could be
produced by the processes
discussed thus far:
• Smooth and shiny surfaces,
such as the bearing
surfaces of the crankshaft.
A forged crankshaft before and after machining the bearing surfaces. The
shiny bearing surfaces of the part on the right cannot be made to their final
dimensions and surface finish by any of the processes described in previous 3
chapters of this book. Source: Courtesy of Wyman- Gordon Company.
, Machining as a Process
• Small-diameter deep holes in a part such as the
injector nozzle.
Cross-section of a fuel-injection nozzle, showing a small hole made by
the electrical-discharge machining process. The material is heat-
treated steel. 4
