SU1217592A1 - Flat broach for working slots and steps - Google Patents

Description

f

The invention relates to metalworking and can be used in external pulling of surfaces.

The purpose of the invention is to increase tool life and machining quality by improving chip formation conditions.

FIG. 1 shows a flat broach for machining grooves and shoulders, a transverse section; in fig. 2 — node 1 in FIG. 1 to FIG. 3 is a view along arrow A in FIG. 2; in fig. 4 is a view along arrow B in FIG. 2;. FIG. 5 is a sectional view BB in FIG. 2; in FIG. 6, section G-D in FIG. 2

The flat broach for machining grooves and shoulders contains blades 1, each of which has cutting edges 2-4. Each cutting edge lies on its surface in the form of a plane (in Figs. 5 and 6, surfaces Pg and P are shown for cutting edges. 2 and 3). The cutting edge 1 is located at an angle of inclination L, cutting

2175922

edge 2 - at an angle D. The rake angle of the cutting edge 1 is equal, and the cutting edge 2 - V

Tilt angles D and front angles - 5 cutting edges 2 - A are calculated from the following relationships:

ten

15

tQ D

  C 1

Sih

17

, + cosfia

sin f

17

where ii is the angle in the plan between the cutting edges

3 the result of which the cutting edges lie in the same plane P and do not form intersections in the form of a dihedral

20 corners.

In the process of pulling out the absence on the front surface of the blades, the 1 speech in the form of dihedral angles ensures the descent of chips without additional

25 deformations.

.2

tQ D

  C 1

Sih

17

, + cosfia

sin f

17

where ii is the angle in the plan between the cutting edges

3 the result of which the cutting edges lie in the same plane P and do not form intersections in the form of a dihedral

corners.

In the process of pulling, the absence of protrusions in the form of dihedral angles on the front surface of the blades 1 ensures the descent of chips without additional

deformations.

6-8

Fig.fi1.5

VNIIPI Order 1039/17 Circulation.1000 Subscription

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Branch GShP Patent, Uzhgorod, Proektna St., 4

FIG. 6

Claims (1)

FLAT DRAWING FOR PROCESSING grooves and guides, each blade of which contains at least two cutting edges, located at an angle to one another, characterized in that, with a chain for improving the quality of processing, the front surfaces of the cutting edges of the blade lie in the same plane, and the corners the inclination and rake angles of the cutting edges are calculated from the relations ^{s, n} 6 12 where Λ g - the inclination angles of the cutting edges; - leading corners of the cutting edges; ^ 12 is the angle in plan between the cutting edges.