Broach

(redirected from broaches)
Also found in: Dictionary, Thesaurus, Medical, Idioms.
Related to broaches: brooches

Broach,

city, India: see BharuchBharuch
, formerly Broach,
city (1991 pop. 139,029), Gujarat state, W India, on the Gulf of Khambat. A port at the mouth of the Narmada River, Bharuch ships cotton, wheat, and timber and manufactures textiles, ink, and glass.
..... Click the link for more information.
.

Broach

A half pyramid above the corners of a square tower to provide a transition to an octagonal spire.

Broach

 

a metalcutting tool with multiple blades used on broaching machines to machine outer surfaces and through-holes. The following broaches are distinguished, based on the shape of the surface to be worked: cylinder, faceted (square, hexagonal, and so forth), spline, keyway, flat surface, and shaped surface broaches.

Figure 1. Broaches: (a) for internal broaching, (b) for external broaching; (1) pull end, (2) and (5) front and rear pilots, (3) cutting section, (4) finishing section

In broaches used for internal broaching (Figure 1, a), the teeth are arranged on a tapered cutting section; they carry out the major work of cutting the final layer of stock to size. The finishing section of the broach has from three to eight teeth. The first of these cut a very thin layer of metal and give the hole its final shape; the other teeth are spares and are used after the broach is reground. Broaches for external broaching (Figure 1, b) are manufactured in the shape of a rectangular bar and have cutting and finishing sections.

In addition to cutting broaches, there are burnishing broaches, which do not cut, but rather smooth and flatten metal. The flattened layer produced by such broaches has high resistance to wear. The teeth of burnishing broaches do not have cutting angles; they are sometimes positioned on the finishing section of the broach.

broach

[brōch]
(mechanical engineering)
A multiple-tooth, barlike cutting tool; the teeth are shaped to give a desired surface or contour, and cutting results from each tooth projecting farther than the preceding one.

broach

1. In quarrying, to free stone blocks from the ledge by cutting out the webbing between holes drilled close together in a row.
2. To finish a stone surface with broad diagonal parallel grooves cut by a pointed chisel.
3. A half pyramid above the corners of a square tower to provide a transition to an octagonal spire.
4. A spire sometimes springing from a tower without an intermediate parapet.
5. Any pointed ornamental structure.

broach

1. a long tapered toothed cutting tool for enlarging holes
2. a roof covering the corner triangle on the top of a square tower having an octagonal spire
3. a pin, forming part of some types of lock, that registers in the hollow bore of a key
4. a tool used for tapping casks
References in periodicals archive ?
Pull broaches are pulled either up, down or horizontally through or across the workpiece, always by a machine.
Internal broaches are either pulled or pushed through a starter hole.
Both external and internal keyways can be cut with these broaches. Internal keyways usually require a slotted bushing or horn to fit the hole, with the keyway broach pulled through the horn, guided by the slot.
Introduction of National Broaches' Red Ring workpiece transfer vertical broaching machine, for example, answers one of the familiar objections to broaching operations: i.e.
Pot broaches are used to produce external forms on parts that are passed through the pot, which holds ring-type and/or stick-type cutting tools.
Ring gears have been successfully produced by Red Ring broaches with side-shaving shells developed by National Broach for many years.
In the case of most broaches, gullet-spacing tolerances of [plus or minus] 0.002" are held routinely.
Eliminating the milling operation reduced broach-production time and cost substantially, and grinding from the solid with electroplated CBN wheels has helped improve performance of our broaches. Customers have reported broach-life increases of 10 to 20 percent and more.
Straddle broaches with facing teeth are shown in the foreground.
To produce other tang dimensions, broaches can be adjusted closer or farther apart in the holder.
* If your workpieces include unusual shapes, it's probably best to have a specialist design the required broaches. Specials usually can be integrated with standard tooling components; e.g., broach holders, fixtures, and workhandling devices.