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Manufacturing Process 2nd

This document discusses secondary machining processes. It explains that secondary processes like turning, milling, drilling, boring, planning, shaping, and slotting are commonly used to achieve dimensional accuracy and a high degree of surface finish on workpieces. These processes use machine tools, cutting tools, and measuring instruments to machine parts like tools, automotive components, nuts, bolts and gears. Significant material is often wasted during secondary machining processes.

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41 views2 pages

Manufacturing Process 2nd

This document discusses secondary machining processes. It explains that secondary processes like turning, milling, drilling, boring, planning, shaping, and slotting are commonly used to achieve dimensional accuracy and a high degree of surface finish on workpieces. These processes use machine tools, cutting tools, and measuring instruments to machine parts like tools, automotive components, nuts, bolts and gears. Significant material is often wasted during secondary machining processes.

Uploaded by

Kodok Super
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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This can be done by a manual process or by using a machine called machine tool 

(traditional
machines namely lathe, milling machine, drilling, shaper, planner, slotter). In  many cases
these operations are performed on rods, bars and flat surfaces in machine shops.  These
secondary processes are mainly required for achieving dimensional accuracy and a very  high
degree of surface finish. The secondary processes require the use of one or more  machine
Shares
tools, various single or multi-point cutting tools (cutters), job holding devices, marking  and
measuring instruments, testing devices and gauges etc. for getting desired
dimensional control and required degree of surface finish on the workpieces. The example of
parts produced  by machining processes includes hand tools machine tools instruments,
automobile parts,  nuts, bolts and gears etc. Lot of material is wasted as scrap in the
secondary or machining process.

Some of the common secondary or machining processes are—

(1) Turning,

(2) Threading,

(3) Knurling,

(4) Milling,

(5) Drilling,

(6) Boring,

(7) Planning,

(8) Shaping,

(9) Slotting,

(10) Sawing,

(11) Broaching,

(12) Hobbing,
(13) Grinding,

(14) Gear cutting,

(15) Thread cutting and

(16) Unconventional machining processes namely machining  with Numerical Control (NC)
machines tools or Computer Numerical Control (CNC) machines  tools using ECM, LBM, AJM,
USM setups etc.

1.7.3 Metal Forming Processes


Forming processes encompasses a wide variety of techniques, which make use of
suitable force, pressure or stresses, like compression, tension and shear or their combination
to cause  a permanent deformation of the raw material to impart required shape. These
processes are also known as mechanical working processes and are mainly classified into two
major categories i.e., hot working processes and cold working processes. In these processes,
no material is  removed; however it is deformed and displaced using suitable stresses like
compression,  tension, and shear or combined stresses to cause plastic deformation of the
materials to  produce required shapes. Such processes lead to production of directly usable
articles which  include kitchen utensils, rods, wires, rails, cold drink bottle caps, collapsible
tubes etc. Some of the important metal forming processes are:

Hot working Processes

(1) Forging,

(2) Rolling,

(3) Hot spinning,

(4) Extrusion,

(5) Hot drawing and

(6) Hot spinning.

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