broaching


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broaching:

see quarryingquarrying,
open, or surface, excavation of rock used for various purposes, including construction, ornamentation, road building, and as an industrial raw material. Rock that has been quarried is commonly called stone.
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Broaching

 

a process of working metals by cutting on broaching machines using a tool with multiple blades called a broach. In light of the complexity and high cost of manufacturing broaches, the use of broaching is worthwhile for working large batches of parts, as in production of large lots or in mass production.

Types of broaching are distinguished on the basis of the order in which the final layer of stock is cut to size. In one method of cutting, all the broach’s cutting teeth remove the final layer, but they do not participate in the final shaping of the surface; this is done only by the last tooth. In a second method, each cutting tooth, in cutting the final layer of stock to size, simultaneously participates in forming the surface. A third method involves removing relatively large amounts of stock. In this method, all the teeth, which are arranged in groups of two or three, remove a layer of metal in sections rather than all at once across the entire width.

There are both free and coordinated methods of broaching. In the free method, the broach produces only the desired size and shape of the surface; in the coordinated method, the broach also produces the worked surface in the exact desired location relative to the reference surface.

In broaching, from 2 to 6 mm of stock is removed when working holes in forgings and castings. In holes produced by drilling, countersinking, countersink reaming, or boring, 0.2-0.5 mm of stock is left to be removed by broaching. The cutting speed in broaching is relatively low (2–15 m/min); efficiency is high, however, because the total length of the simultaneously cutting edges is great. Broaching produces a precision of class 3-2; the surface roughness of the worked surface varies from class 7 to class 9. A characteristic feature of broaching is the constant accumulation of chips in the depressions in front of each tooth. The teeth are often provided with grooves to break up the chips, thus improving the process of chip removal and preventing the broach from jamming.

REFERENCE

Vul’f, A. M. Rezanie metallov, 2nd ed. Leningrad, 1973.

N. A. SHCHEMELEV

broaching

[′brōch·iŋ]
(engineering)
The restoration of the diameter of a borehole by reaming.
The breaking down of the walls between two contiguous drill holes.
(mechanical engineering)
The machine-shaping of metal or plastic by pushing or pulling a broach across a surface or through an existing hole in a workpiece.
References in periodicals archive ?
Unlike the isolating counselor, the continuing/incongruent counselor does not lack efficacy or maintain a preoccupation about the client's reaction to the counselor's broaching behavior.
Broaching threaded studs--These phosphor bronze fasteners can be used as solderable connectors or as permanently mounted mechanical fasteners with external threads.
This category of hardware consists of broaching nuts for board mounting, broaching standoffs in threaded or unthreaded types for stacking or spacing components, flare-mounted standoffs for applications where components are subject to high pullout forces, threaded studs for use either as solderable connectors or as permanently mounted mechanical fasteners with external threads, one-piece board-mount assemblies in which screws remain captive for easy mounting and removal of PC boards without loose hardware, and self-expanding fasteners with a self-expanding shank for positive contact with plated thru-holes.
Internal broaching requires a starting hole or opening in the workpiece so the broaching tool can be inserted.
Nothing has made a greater impact upon the gear manufacturing industry's ability to provide flexible production solutions than the incorporation of for instance, into the broaching process.
Whereas conventional broaching systems move the broaching tool down through the workpiece, the BV-T removes material by pushing the workpiece up over a fixed broaching tool.
The reason for these advances is that broaching as a process provides high production rates with low operator input requirements, repeatable high accuracy, low cost per piece, and high finish quality.
Broaching can be used for the external or internal machining of flat, round, or contoured surfaces.
A single 36"-stroke vertical broaching machine from Ty Miles Inc, Westchester, IL, has replaced five milling machines in manufacturing parts.
But large gears like flywheels have been relegated to relatively slow hobbing processes because available broaching machines didn't have the muscle to do 12 to 20 gears and show the quality levels they can achieve.
Therefore, broaching within counseling is expected to build rapport and trust between the counselor and client, enhance counselor credibility, and permit clients to more comfortably discuss their experience through all relevant lenses of identity (Cardemil & Battle, 2003; Day-Vines et al.