Cemented carbide broaches compositions

1.The working part (1) The cutting portion (2)The calibration part

2.Non-working portion (1) Shank portion (2) The leading portion (3) the transition cone (4) neck (5) after the guide portion (6) After the Trust Department

Round broaches for example, cemented carbide broaches compositions as shown: prestalk l1 neck l2, transition cone l3, leading Ministry l4, the work of the Ministry of l5 and after guide l6 for long or heavy broaches must also be made the support after handle l7.

Cemented Carbide Broaches Compositions

Cemented carbide broaches are made of the working portion and the non-working portion

Cemented carbide broaches some structural parameters: tooth liter amount ?z the the adjacent cutter radius to achieve per tooth resection metal layer; each tooth has a rake angle γo posterior horn ɑo. And a rear corner on the blade width bɑ1 in the adjacent interdental made chip flutes.

Broaching cutting layer size: broaching length L, cutting thickness hD and cutting width bD.
Broaching methods: the broaching methods refer to broaches hourly teeth excised allowance from the workpiece surface.

The broaching methods: layered (Fig. a), sub-block (Figure b) and integrated (Figure c).

Broaching Methods

The broaching methods includes layered , sub-block and integrated .

1．Layered broaching methods: each allowance is cut by a cutter. However, depending on the workpiece surface final profile shape formation process is divided into:
(1)The same profile type: the same profile broaching means that the final profile shape is similar to the contour of the machined surface of the cutter, the final profile shape is formed after the last cutting teeth pull cut.
(2)Gradually became: gradually became broaching means that machined surface final profile shape is formed convergence cut each knives teeth pull.

2．Sub-block (round-cut) broaching methods
Figure b carved block broaches take I, II, III group knives teeth, tooth groups the larger teeth liter amount ?z each group of three teeth, the front two teeth blade staggered distribution are removal of the machined surface1,2 position at the margin, the final round tooth from the role of the wiper. In addition, there are made regardless of the teeth groups, each cutting teeth have larger teeth l amount of the tooth cutting edge, each adjacent knives showed a staggered distribution for the interleaved block broaching.

3．Comprehensive: Comprehensive broaches broaching the front cutter made the monodentate segmented, the rear cutter made of the same profile tiered.
The main features of three broaching methods: the same profile of layered broaches teeth liter small, high quality of broaching, broaches longer. Same profile had become the broaches broaching forming surface broaches easier to manufacture broaching of poor quality; teeth liter large block type broaches, broaching suitable for large-size and large margin the surface, can also pull cutting rough surface, the length of the broach cutter is short, high efficiency, but not easy to improve the quality of broaching; consolidated broaching pull tool to have the same profile layered block broaching advantages, the current margin larger circular hole broaching often use integrated-round broaches.

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