DE7708833U1 - REAMER WITH DRILLING STEP AND HIGHLY UNEQUAL PITCHING OF THE REAMER CUTTERS - Google Patents

Description

Patent Attorneys Dip! .- Ing Harfä Larjöteth ^ Ur.-kig ^ Heinz Hosenthien 7000 Stuttgart 1 Herd weg 62,. "Tetetdn '(07: i1) 296523

Applicant:

company

BIAX-Werkzeuge KG, Wezel & Co., Precision tool factory Talweg 1

7133 Maulbronn

Reamer with drill step and very unequal pitch of the reamer cutting edges

The invention relates to a combined tool for simultaneous drilling and reaming with strongly unequal Division of the reamer blades.

From DT-OS 1 627 238 a reamer with strongly -5 unequal pitch of the reamer cutting is known.

Wezel 3910

7708833 3O.0E77

To machine workpieces, these must be pre-drilled, whereby the pre-drilling diameter is around the usual Friction allowance is chosen to be smaller than the diameter of the desired finished, reamed hole.

The invention is based on the object of creating a reamer of the type mentioned at the outset, with the possible Rationally exact holes with * -exact hole position can be produced.

To solve this problem, the invention provides a drilling step and a smaller outer diameter larger friction stage in the outer diameter.

By arranging a drilling step and a friction step, especially when using NC machines In the machining sequence drilling, countersinking, reaming, at least one work step, e.g. the countersinking process, is omitted. In order to additional tool costs can be saved, tool changing times for this operation are eliminated and tool storage and tool maintenance costs are also reduced. Because through every single machining process a hole position error is caused by combining two operations namely the drilling and reaming with a tool, the possible positional errors of the hole can be reduced.

Wezel 3910 121

A much better chip evacuation with a simultaneous increase in the precision of the hole to be produced can be achieved in that the chip mass enclosed by the largest division of the cutting edges is deeper is designed than the other chip chambers, expediently assigned to the deeper chip chambers Cutting the drilling stage take over the main machining work of drilling.

In the case of a reamer with a centering provided on the face side, the depth is expediently that of the largest Division of the cutting edges enclosed chip chamber only formed up to close to the front centering, so as not to impair their centering function.

In an advantageous manner, the drill cutting angle lie between iuinus 10 and + 30, with one

ο Drill cutting angle between approx. 0 and minus 10, even if the pre-drilled hole is incorrectly positioned Errors can be corrected again and, in spite of this correction, with the reamer stage a circular jrm-accurate Bore is achievable. With a drilling angle selected in this way, the deflection forces are minimized so that the tool does not move out of its intended position even with a somewhat eccentric drilling process will.

Wezel 3910 121

7708833 06/30/77

-A-

The cutting edges and the chip chambers can be grooved and straight for machining short-chipping materials for machining long-chipping materials with a helix angle of up to approximately 12 be trained.

A particularly long service life of the tool can be achieved in that the cutting edges of the drilling stage are formed by hard metal inserts that are easy can be turned and exchanged. Appropriately, two hard metal indexable plates are then symmetrical intended. In this case, it is also not necessary to provide support teeth for the drilling stage, since a Such a tool design can only be sensibly implemented from a diameter of around 28 mm and here the tool is a sufficient one Has inherent rigidity, so that the subsequent reamer stage has precise and circular bores generated.

To simplify production, both the cutting edges of the drilling step and the reamer cutting edges the same unequal pitch, with the difference in diameter \ ede can correspond to the usual friction allowance.

To achieve a longer service life, the cutting edges of the drilling step and / or the friction step are advantageous

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. «II II I I l>

■ ·

1 ■

ti * i

- 5 soldered hard metal plates formed.

Especially with reamers of smaller diameters Advantageously, the entire tool is made of hard metal, which is then particularly due to the high material rigidity is dimensionally stable, so compared to the usual reamers with respect to the bore position more precise bores can be produced are.

In a preferred embodiment, both are The drilling stage and the friction stage each have six cutting edges, two of which are symmetrical are arranged to the central axis, the angles between the cutting edges being approximately 60.45 and 75 °. The deepest Chip chamber is provided at a pitch angle of 75, with the depth of the chip chamber about 30% of the friction diameter can be, which enables a particularly good chip flow even with long-chipping materials will.

Further advantages and features of the invention emerge from the following description with reference to FIG attached drawings as well as from further subclaims. It shows:

Fig. 1 is a partial view of a reamer

partially cut with hard metal plates,

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«Ι <■

Fig. 2

Fig. 3

Fig. 4

■ A Fig. 5

Fig. 6

- 6 -

an end view of the reamer shown in Fig. 1 according to the arrow II in Fig. 1,

a partial view of a solid carbide reamer,

a partial view of a reamer with a drill step with hard metal indexable inserts,

a front view according to the arrow V of the reamer shown in FIG and

another embodiment of a Reamer with carbide insert.

When shown in Figs. Embodiment of a reamer are distributed on the circumference six cutting edges 1, Γ, 2, 2 ', 3, 3 ¹ forming hard metal plates 4,4', 5,5 ', 6,6 "on teeth 7,7 *, 8,8', ^{9, 9 'soldered on, with chip chambers 10, 10', 11, II 1} , 12, 12 'being provided in front of the hard metal plates 4,4', 5,5 ', 6,6 "for the removal of the chips. The division between the individual cutting edges is unequal. The pitch angle between the cutting edges

1 and 2 or 1 ', 2' is in the exemplary embodiment 60 °, while the pitch angle between the cutting edges

2 and 3 or 2 ', 3' 45 and the partial angular angle between 'the

Cutting 3 and 1 'or 3' and 1 is 75 °. The cutting

of drilling stage 1 and I ¹ are designed as main cutting edges, which are

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7708833 06/30/77

• *

- 7 - ¹

The arranged chip chambers 10, 10 · are therefore inserted particularly deep.

The cutting edges 1,1 ', 2, 2', 3,3 'of the hard metal plates 4 to 6 are offset in diameter. The arranged at the tool tip drilling step 13 has a smaller diameter than the longer friction step 14 with a larger diameter. Front side the reamer is provided with a centering 15, which is used to clamp the tool during regrinding serves. The depth of the chip chambers 10, 10 * is chosen so that the full effectiveness of the centering 15 is guaranteed is.

The cutting edges 1,1 ', 2,2', 3,3 * are on the front side with a Drill cutting angle 16 formed in the exemplary embodiment 30, while the cutting angle 17 of the friction step is 45. Should also drill holes with the reamer Drilled out in the correct position with minor misalignments and are rubbed out, the drilling angle IC is selected to be small to negative. In the exemplary embodiment In FIG. 3, for example, the drill cutting angle 16 is 0 °. In this embodiment it is around a solid carbide tool with inclined cutting edges 1,1 ', 2,3 with a helix angle 18 of 12.

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Tools with inclined cutting edges are used for long-chipping materials, while axially parallel Find cutting edges for short-chipping materials.

In the tool shown in FIGS. 4 and 5, the friction stage 14 corresponds to the exemplary embodiment 1 and 2, while the drilling stage 13 is formed by only two arranged on the tool tip Tungsten carbide inserts 19.19 "is formed. This has the advantage that the much stronger stressed drilling stage 13 by turning the hard metal inserts 19,19 'a significantly longer service life having.

In the exemplary embodiment in FIG. 4, the drill cutting angle is 16 about 30 °, while in the embodiment of FIG. 6 it is 0 °. Through appropriate The drilling cutting angle 16 can also be set negatively, for example down to minus 10, in this case in order to minimize the deflection forces acting on the cutting edges, as well as bores To be able to drill out and rub out positional errors accurately.

Wezel 3910 121

Claims (14)

Protection claims 1. Reamer with drilling step and very unequal division of the reamer cutting edges, characterized in that a drilling step (13) with a smaller outside diameter and a friction step (14) with a larger outside diameter is provided. 2. Reamer according to claim 1, characterized in that the chip chamber (10,1O ¹ ) enclosed by the larger pitch of the cutting edges (1,3 ';3,1') is deeper than the other chip chambers (11,12). 3. Reamer with a centering provided on the end face, c "c \ characterized in that the depth of the chip chamber (10.1O ¹ ) enclosed by the largest division of the cutting edges (1.3 *; 3.1 ') up to close to the end face Centering (15) is sufficient (Fig. 5). 4. Reamer according to one of claims 1 to 3, characterized in that the drill cutting angle (16) is between minus 10 and 30 °. 5. Reamer according to one of claims 1 to 4, characterized in that the twist angle (18) between 0 and 12 lies. Wezel 3910 121 7708833 3O.06.77 6. Reamer according to one of claims 1 to 5, characterized characterized in that the cutting edges (19, 19 ') of the drilling step (13) are replaced by hard metal inserts (19, 19') are formed. 7. reamer according to claim 6, characterized in that that two hard metal indexable plates (19, 19 ') are provided symmetrically. '/' ■ ·, 8. Reamer according to one of claims 1 to 5, characterized in that both the cutting edges (1,1 ', 2,2', 3, 3 ') of the drilling step (13) and the reamer blades have the same unequal pitch. 9. Reamer according to one of claims 1 to 8, characterized in that the difference in diameter between the drilling stage (13) and the friction stage (14) of the usual * Friction allowance corresponds. 10. Reamer according to one of claims 1 to 9, characterized in that the cutting edges (1,1 ', 2,2', 3,3 ') the drilling stage (13) and / or the friction stage (14) are formed by soldered-on hard metal plates (4,5,6). 11. Reamer according to one of claims 1 to 9, characterized in that it is made entirely of hard metal itself consists. Wezel 3910 121 7708833 06/30/77 12. Reamer according to one of claims 1 to 11, characterized in that six cutting edges (1, I ¹ , 2.2 ', 3.3') are provided, two of which are arranged symmetrically to the central axis and the angle between the Cutting edges be around 60.45 and 75. 13. Reamer according to claim 2 or _; , 3, / characterized in that the depth of the deep chip chambers (10, is about 30% of the friction diameter. 14. Reamer according to one of claims 1 to 13, characterized in that the cutting edges and given if their supporting teeth have a round phase that is wider than the round phase of the reamer side cutting edges. Wezel 3910 121 7708833 06/30/77