Chapter 4: Shearing and Material Removal Flashcards
Seaming, flanging, roll bending and draw bending belong to what classification of metal forming operation
bending
When the bending pressure is removed at the end of deformation, elastic energy remains in the bend part, causing it to recover partially toward its original shape.
Springback
Piercing, blanking, lancing, and fine blanking are classified as
shearing
High cutting temperatures can cause inaccuracies in part dimensions due to thermal expansion of work material
True or False?
True
Minimum distance between holes or the edge of the stock should be at least equal to the metal thickness
True
Process used to cut coils of sheet metal into several rolls of narrower width
Lengthwise Shearing
In this type of chip , this is used for ductile work materials with high cutting speeds
Continuous
___ is used to create a round hole, usually by means of a rotating tool (drill bit) that has two cutting edges
Drilling
Removes large amounts of material from starting workpart
roughing
Material removal by a sharp cutting tool
Machining
Rotating multiple-cutting-edge tool is moved slowly relative to work to generate plane or straight surface
Milling
Tool-chip friction causes portions of chip to adhere to rake face
Continuous chip with Built-up Edge
Sheet metal forming is considered to be secondary processing
True or False
True
___ refers to the plastic deformation of metals about a linear axis with little or no change in the surface area
Bending
Turning is performed on the inside diameter of an existing while boring is performed on the outside diameter of an existing cylinder
True or False
False
A contour is progressively cut by producing a series of overlapping slits or notches
Nibbling
It is a continuous form of three-point bending
roll bending
Opposite of bending is ___
Straightening
Most effective on tool materials that are most susceptible to temperature failures
Coolants
Fracture and tearing begin at the strongest point and proceed progressively or intermittently to the next-weakest location
True or False
False
Piercing a large number of closely spaced holes
Perforating
The basic components of a piercing and blanking die set are: die , stripper plate and ___
punch
Bar folders make bends in heavier sheets or more complex bends in thin material
False, Press Brakes
Specialized Engine lathe with greater accuracy.
toolroom
Piercing operation that forms either a line cut or hole
Lancing
Single point cutting tool removes material from a rotating workpiece to form a cylindrical shape
turning
The basic form of peripheral milling in which the cutter width extends beyond the workpiece on both sides
Slab milling
It is a bending operation that can be used to join the ends of sheet metal in some form of mechanical interlock
seaming
Various energy forms other than sharp cutting tool to remove material
Nontraditional processes
The piece being punched out becomes the workpiece
Blanking
Tool is fed radially into rotating work at some location to cut off end of part
Cutoff
It is a process by which a metal strip is progressively bent as it passes through a series of forming rolls
roll forming
Most common type of lathe
engine lathe
The piece being punched out becomes the workpiece and pressure pads are used to smooth edges in shearing
Fine Blanking
