burr

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burr

1, bur
1. a washer fitting around the end of a rivet
2. a blank punched out of sheet metal

burr

2, buhr, bur
1. short for buhrstone
2. a mass of hard siliceous rock surrounded by softer rock

Burr

 

(also called flash), a projection on the surface of a product that is being worked; it forms as a result of the extrusion of material into the gap along the joint of a tool (a die or a pair of rollers) or because of imperfect cutting of the billet. When metal is worked using other methods, burrs are formed only if the production process has not been adjusted properly or if a worn tool is used.


Burr

 

in woody trees, a thickening or growth on the trunks, branches, or roots. Burrs result from the local thickening of tissues, apparently in response to irritation or damage to cambium cells and dormant buds by fungi, frost, fire, or mechanical injuries (blows, slashes). According to the external appearance and to the structure of the fibers, two types of burrs are distinguished: those with smooth surfaces and slightly wavy wood and those with uneven surfaces and knotty wood (burls). The former type develops on the trunks of all varieties of trees; on pines and firs such burrs have wavy and relatively broad annual rings and consist of short thick-walled tracheids with curved or separated ends and of numerous large heartwood rays. The wood of burrs is much denser and harder than the ordinary trunk wood. Depending on dimensions and texture, burr wood may be used for producing structural ornament or for small household and artistic objects.

burr

[bər]
(botany)
A rough or prickly envelope on a fruit.
A fruit so characterized.
(metallurgy)
A thin, ragged fin left on the edge of a piece of metal by a cutting or punching tool.

burr

1. A waste brick from the kiln which has been partially fused.
2. A batch of bricks fused together.
3. A rough or sharp edge left on metal by a cutting tool.
4. Same as burl, 1.

burr

A type of metal damage in which the sharp, rough edge of a piece of metal is left when the metal is sheared, punched, or drilled. This type of damage is more common in case compressor blades.
References in periodicals archive ?
Don Burr is the founder of People Express, the celebrated but failed experiment in no-frills travel.
In some ways, Burr and Crandall are a dream duo, possessed of skill sets that are remarkably complementary.
Crandall and Burr are trying to carve out another option, far more flexible than the existing choices, akin to simply calling a car service.
MPE's "Platinum" series replacement burrs are guaranteed to provide grind uniformity, equal or greater wear life and typically cost 30-50% less than factory original replacement burrs.
Any thrashing to get loose of one burr will cause its victim to hit neighboring burrs, ensnaring it more.
Occasionally, however, a snagged animal isn't strong enough to rip a burr free from its parent plant and finds itself locked in a potential death trap.
The Burrs enjoy spending all of their free time with their five grandchildren: Alexandra Valenzuela, James Martin, Marisa Valenzuela, Alison Burr and Rylee Martin.
Richard and Dolores Burr of Van Nuys celebrated their golden wedding anniversary on June 14 with a Sunday brunch for family and friends at the Warner Center Marriott in Woodland Hills.
The brunch was given to them by their children - son Donald and daughter-in-law Cynthia Burr of Dallas; daughter Cynthia and son-in-law James Martin of Chatsworth; and daughter Victoria and son-in-law Troy Valenzuela of Thousand Oaks.
Burr says Adrian and Rayvon were more like brother and sister during the first few years.