DE9213858U1 - Step countersinking tool - Google Patents

Description

European Patent Attorney

NORBERT VV. SEAMAN

Patent and Civil Engineer Mandataire en brevets Europeanen

Patent office:

Brehmstrasse D-7320 Göppingen

Tel. 07161-71166 Fax 07161-683529

Telegrams: "Sea patent"

22 Sept. 1992 G 9228 Al Se-Fü/es

Applicant:
Alfred Müller
Zeppelinstrasse 6
W-7306 Denkendorf

Step countersinking tool

Cutting step countersinking tools with interchangeable cutting inserts are generally known. However, due to the permissible tool tolerances, precision holes cannot be achieved with such tools.

An improvement of this situation was achieved with a step countersink according to DE-OS 42 01 716.

Kreissparkasse Göpping-31 (Rl.7. 6105.X)OO) KoMo 474595 Postal checking account Stuttgart (bank code 60010070) No. 189103-702

This allows the diameter of the hole(s) to be machined to be precisely adjusted using cutting plates that are radially movable and detachably attached to the tool carrier.

However, when machining base and/or stepped bores with such tools, problems arise, especially on the flat surfaces. The invention specified in claim 1 is based on the problem of creating a stepped countersinking tool provided with (interchangeable) cutting plates, which allows precise alignment of the cutting plates in the radial and axial direction.

This problem is solved with the means and structural measures specified in claim 1; the subclaims contain advantageous embodiments and further developments of the inventive basic idea.

The precise adjustment of the cutting inserts in the radial and axial directions according to the invention enables very precise machining of all surfaces of bores, in particular the bore bottom or stepped bores with regard to dimensional accuracy and surface quality.

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Furthermore, this solution allows for larger machining feed rates, which can significantly reduce machining time.
By providing a range of cutting insert holders corresponding to the common cutting insert shapes, an enormous reduction in tool costs is possible, since in principle only one tool carrier is necessary.
The invention will be explained in more detail with reference to an embodiment shown schematically in the drawings.

Show it:
Fig· 1- 2 the step countersinking tool in two views,

Fig. 3a-3d the cutting plate holder in several views and

Fig. 4a- 4d the slide-like holder in

different views,

In Fig. 1 - 3d, individual elements are not always shown for the sake of clarity.

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The step countersinking tool according to the invention with (interchangeable) cutting plates 2 fastened to the circumference of the tool carrier 1 on a slide-like holder 4 that is guided so as to be radially R displaceable has, in this embodiment according to Fig. 1 - 4c, three steps la - Ic. Each step la - Ic is provided with two cutting plates.

According to the invention, the cutting plates 2 are now arranged on and with the said slide-like holder 4 in cutting plate holders 7 that can be adjusted and locked axially parallel to the longitudinal axis of the tool carrier, adjustment direction R1, whereby a threaded pin 6 provided for radial adjustment is mounted in a bore 6b provided in the tool carrier 1 and provided with a threaded part, corresponding to the holder 4.

The cutting plate holders 7 are preferably fitted into corresponding recesses Ie in such a way that the clamped cutting plate 2 with its upper surface essentially coincides with the chip removal If of the tool carrier 1. By tightening a not shown, each projecting through a corresponding countersunk hole Id or the like,

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This 7 is secured in the intended position on the tool carrier 1 by means of a screw or similar engaging in a threaded hole 7e. The cutting edges of the cutting plates 2 can thus be adjusted very precisely to one another in the axial direction.

The outer surface 7f of the cutting plate holder 7 is bevelled in one or more stages depending on the diameter of the tool carrier.

In a special structural development, the countersunk hole is shaped like an angle hole.

Furthermore, the lower surface 7d of the cutting plate holder 7 and the surface of the milling Ie facing this 7d each have a coordinated, axially parallel toothing or the like. When the cutting plate holder 7 is adjusted in the axial direction, the radial position of the cutting plate 2 is maintained. Higher forces can also be absorbed.

In addition, for finer adjustment, a predominantly in a recess 7h on the cutting plate holder 7 is provided, at its

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An adjusting screw 7g is provided on the head with a large number of radially directed recesses. Its head rests on the rear wall of the milled recess Ie.

The cutting plate 2 accommodated in the shoulder 7c of the cutting plate holder 7 is fastened to the slide-like holder 4 with the clamping screw 3 engaging in the threaded hole 4d. This 4 sits with its guide part 4b in the recesses 7a and 7b of the cutting plate holder. The slide-like holder 4 provided, which is known per se and has a guide part 4b, a wedge surface 4c and an inner end 4a, is additionally provided according to the invention in its lower area with a limiting groove 4f and/or in its upper area, in the guide part 4b, with a wedge groove 4e. This means that the holder 4 can be used in a variety of ways.

The radial adjustment of the cutting plate 2 is carried out via the threaded pin 6 corresponding to the slide-like holder 4, which itself acts directly on the inner end 4a or the wedge surface 4c.

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Further advantageous developments according to the invention of the embodiment shown with regard to the radial adjustment are mentioned below.

A threaded pin (not shown) located in the tool carrier 1 and protruding through the cutting plate holder 7 engages in the limiting groove 4f of the holder 4. The adjustment range is thus specified and the holder 4 is secured against possible ejection under extreme loads. It can also be advantageous to arrange this threaded pin directly in the cutting plate holder 7.

Another development is this: to adjust the holder 4, its keyway 4e is used. In this case, the hole 6b with threaded pin 6 would have to be arranged in the tool holder 1 and the guide part 4b would have to be designed in its length, as shown in Fig.

4d illustrates this. For the sake of simplicity, no cutting insert holder is shown here. Or the threaded pin 6 is provided in the cutting insert holder 7.

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The advantage here is that the elements to be actuated for the axial and radial adjustment of the cutting plate 2 are accessible from one side.
5

The movement of the bracket 4 including the limitation and securing is carried out by only one group of elements - 6b, 6, 4e.

As is known with cutting tools, more than two cutting edges (plates) can be provided in each stage la - lc. It is also possible to design the first stage of the tool carrier according to the invention and the others Ib - Ic ... In conventionally.

This will depend on the intended use of the tool.

Among other things, the axially and radially adjustable holder for cutting plates according to the invention can also be used on other cutting tools, e.g. milling heads etc. It is not limited to step countersinking tools.

ReferencesList

1 Tool carrier la, Ib, lc stages ld Countersunk 1 och the Milling If S &rgr; a &eegr; a b f ü h r u &eegr; g 2 Cutting plate 3 Clamping screw 4 slide-like holder (clamping bolt) 4a inner end 4b Management part1 4c Wedge surface 4d Threaded hole 4e Keyway 4f Limiting groove 6 Threaded pin 6b drilling 7 Cutting plate holder 7a Recess (for item 4) 7b Recess (for item 4b) 7c Paragraph 7d lower surface 7e Threaded hole 7f outer surface 7g Adjustment screw 7h deepening R, Rl Adjustment direction

Claims (10)

European Patent Attorney -mg. NORBERT W. SEEMANN Patent and civil engineer
Representative on European licences Patent office: Brehmstrasse D-7320 Göppingen Tel. 07161-71166 Fax 07161-683529 Telegrams: "Sea patent" 22 Sept. 1992 G 9228 AL Se-Fü/es Applicant:
Alfred Müller
Zeppelinstrasse 6
W-7306 Denkendorf Protection claims 1. Step countersinking tool with at least
a level (la, Ib, Ic) of the tool carrier
(1) (interchangeable) cutting plates (2) each mounted on a slide-like holder (4) which is guided radially (R), characterized, Kreissparkasse Göppingen (&Bgr;·.7 610MX)CI) Koi.to -.74 595 Postal checking account Stuttgart (bank code 60010070) No. 189103-702 that the cutting plates (2) are arranged on and with said slide-like holder (4) in cutting plate holders (7) that are axially adjustable and lockable parallel to the tool carrier's longitudinal axis, with one for radial adjustment provided threaded pin (6) in the tool carrier (1) is mounted correspondingly to the holder (4). 2. Step countersinking tool according to claim 1, characterized, that the cutting plate holders (7) are fitted into corresponding milled recesses (Ie) of the tool carrier (1) and by tightening a screw or the like protruding through a corresponding countersunk hole (Id) or the like and engaging in a threaded hole (7e) on the tool carrier (1) in the can be locked into the desired position. 3. Step countersinking tool according to claim 2, characterized, that the respective countersunk hole (Id) is designed like an angular hole. 4. Step countersinking tool according to claim 2 or 3, 10 characterized, that the lower surface (7d) of the cutting plate holder (7) and the surface of the milled recess (Ie) on the tool carrier (1) facing this (7d) each have a coordinated, axially parallel toothing or the like. 5. Step countersinking tool according to one of claims 1 to 4, characterized, that a shoulder (7c) receiving the cutting plate (2) and recesses (7a and 7b) accommodating the slide-like holder (4) provided with a guide part (4b) are provided on the cutting plate holder (7). 6. Step countersinking tool according to one of the claims 1 to 5,
10 characterized, that the cutting plate holder (7) has a predominantly located in a recess (7h) provided thereon, on its head with a plurality of adjusting screw (7g) provided with radially directed recesses. 7. Step countersinking tool according to one of claims 1 to 6, characterized, that the cutting plate holders are assigned to the tool carrier (1) as an assortment according to the common cutting plate shapes. 8. Step countersinking tool according to one of claims 1-6, characterized in that the slide-like holder (4) having a guide part (4b), a wedge surface (4c) and an inner end (4a) is provided in its lower region with a limiting groove (4f) and/or in its upper region, in the guide part (4b) with a wedge groove (4e). 9. Step countersinking tool according to claim 8, characterized in that a threaded pin located in the tool carrier (1), protruding through the cutting plate holder (7) or arranged in the cutting plate holder (7) engages in the limiting groove (4f), 10. Step countersinking tool according to claim 8, characterized in that the threaded pin (6) extends into the keyway (4e) and is in operative connection with it.