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 ?
In the wake of statistical analysis, it may be presumed that coating did not influence burr formation when input parameters, such as feed rate, cutting speed, and sharpening, were changed.
In fact, sharpening 'N' provided the lowest burr height.
Figure 4 shows some examples of burr height at the end of the hole.
Variation in type of coating or in the input parameters does not produce burr height with sizes smaller than sharpening 'N'.
Current study showed the influence of input parameters and drill geometry in the minimization of burr formation in the drilling of SAE 306 aluminum alloy.
A) Feed rate and cutting speed variation affected significantly burr formation.
Burr is the entrepreneur, while Crandall brings the experience of running a large legacy carrier.
But Burr had one idea firmly in mind: He did not want to be a Lorenzo-style manager.
It seems a safe assumption that Crandall will cede the touchy-feely employee and customer stuff to Burr.
Burr and Crandall are confident they can assemble just such a system, thanks in part to a recent hire: Jeff Cohen, former chief information officer of JetBlue.
As a hedge, Burr and Crandall are in talks with Eclipse, although that company faces even more serious delays.
By relying on very light jets, with very low operating costs, Burr and Crandall project that Pogo's service will cost closer to $1,800 an hour.