DE3024186A1 - Milling cutter for narrow grooves - has discs with peripheral pockets for radial locking members secured by screws behind cutting elements - Google Patents

Abstract

The milling cutter for forming narrow grooves is in crankshafts, camshafts etc., has discs (1,2) carrying locking members (8) for the cutting elements (3). Each locking member is L-shaped in end view, and is secured by a screw (9) passing through the lower part and inserted into a hole (15) topped in the disc. The cutting element projects for a distance (9) from the surface of this part, equal to the depth of cut. Each locking member is retained inside a pocket in the side of a holder (4) forming the periphery of the disc. The remainder of the locking member consists of a finger projecting outwards to support the cutting element. This finger has a concave curved (18) top surface, forming a pointed tip adjacent to the cutting element. The top edge of the holder also incorporates a concave curve (6) to dispose with swarf.

Description

PATENTANWÄLTE DIPL.-ING. H. STEHMANN * DIPL.-PHYS. DR. K. SCHWEINZER **

D-B500 NÜRNBERG 70 ESSENWEINSTRASSE 4-6 TELE FON 091 1/20 37 27 C- TELEX 06-231 35

Nuremberg, 6/26/80 17/64/63

Sitzmann & Heinlein GnbH, Bahnhofstr. 11-13, 8502 Zirndorf

"Side milling cutters, especially for narrow grooves or cutting widths"

The invention relates to a side milling cutter, in particular for narrow recesses or cutting widths Cutting elements, in particular indexable inserts, for fastening the cutting elements to the milling cutter Clamping elements are used, preferably for use in a set milling cutter for milling gear or gear for cutting camshafts or the like.

Milling tools are known, in particular for use in crankshaft milling machines or camshaft milling machines, which are designed as set milling cutters and are composed of sub-units / each sub-unit of one There is a disc milling cutter that is provided with cutting elements is.

The individual side milling cutters consist of relatively narrow ones Slices, with the individual cutting elements only making narrow grooves or having narrow cutting widths. With such side milling cutters, there is the difficulty of the cutting inserts in a simple manner

130062/0339

• PATENT LAWYER FROM 1930 TO 1960 "APPROVED REPRESENTATIVE BEFORE THE EUROPEAN PATENT OFFICE

attach.

The invention is therefore based on the object of designing a side milling cutter of the type mentioned at the outset in such a way that that cutting elements, preferably indexable inserts, can be clamped securely and firmly, with a replacement of the cutting elements or a turning of the indexable inserts be made possible in a simple manner target.

According to the invention, this object is achieved with a disk milling cutter of the type mentioned at the outset is essentially achieved in that the milling cutter each has the penetration depth adapted narrow cutter carriers which merge into a reinforced base body and pockets for receiving the cutting elements and chip pockets for receiving the clamping elements that the clamping elements as clamping wedges which can be fastened by means of screws are formed radially on the reinforced base body of the milling disk are, with an approximately cuboid base body on which one side surface is integrally formed a radially extending clamping finger that the axial Depth of the clamping finger about the axial depth of the grooving depth adapted narrow cutter carrier of the milling disc corresponds and that a radial opening is provided approximately centrally in the cuboid base body, for Receipt of a fastening screw for the clamping wedge in a recess of the reinforced base body of the Milling disc with a radial threaded hole is provided for the fastening screw.

This makes it possible to securely attach narrow cutting elements if the milling disk is sufficiently stable, namely, viewed in the direction of rotation, either on the left edge or on the right edge of the milling disk or else in the middle.

130062/0393

A particularly stable attachment of the cutting elements, for example with regard to the centrifugal forces that occur, according to a further development of the invention, when the Clamping finger has a clamping surface for the cutting element which is inclined to the associated radius.

The angle between the clamping surface of the clamping finger and the associated radius is preferably approximately 10 °.

In a preferred embodiment of the invention the clamping surface of the clamping finger protrudes over the associated surface of the cuboid base body of the Clamping wedge addition.

To facilitate the chip flow, the clamping finger, according to a further feature of the invention, has one of the Chip pocket in the milling disk adapted, concave upper surface.

According to the invention are particularly advantageous trained Cutting elements in the form of double-V-shaped indexable inserts are used.

The formation of the double-V-shaped indexable insert is made in such a way that two V-shaped widened end areas adjoin a rectangular central part, which are provided with a front-side and a rear-side cutting edge, the front-side and the rear cutting edges of the two end regions are each diagonally opposite one another. This creates a chip split achieved, which is of great importance for proper function.

An advantageous application of the disk milling cutter according to the invention results in a set milling cutter consisting of several side milling cutters of the type mentioned above, wherein the individual disc milling cutters offset in the circumferential direction with respect to the teeth formed by the cutting elements

130062 / Ö33S

are arranged and braced against each other.

Further advantages and features of the invention are based on the drawing explained in more detail the apparent exemplary embodiments represents. It shows:

Fig. 1 partial sections of two side-by-side side milling cutters according to the invention in side view,

FIG. 2 shows the exemplary embodiment according to FIG. 1 in a radial section,

3 shows the embodiment according to FIGS. 1 or 2 in plan view,

4 shows a clamping wedge according to the invention,

Fig. 5 shows a section through the clamping wedge
Fig. 4

Fi.g 6 a plan view of the clamping wedge according to FIGS. 4 and 5 and

7 shows a cutting element according to the invention.

In Fig. 1, an embodiment is shown in a partial section, in which two disc milling cutters according to the invention in the axial direction next to each other, with respect to the
Cutting elements offset, are arranged.

There are pockets 5 in circular milling disks 1 and 2, respectively
arranged for cutting elements 3 and in front of these pockets 5 chip pockets 6. The cutting elements 3, preferably reversible

cutting inserts are clamped by clamping element 8, wherein the milling disks 1 and 2 each have the recess depth a adapted narrow cutter carrier 4, the merges into the reinforced base body 7.

As can be seen in particular from FIG. 2, the clamping elements 8 are in the reinforced base body 7 by means of Fixing screws 9 attached.

The clamping elements or clamping wedges 8 have, as will be explained in more detail later, clamping fingers 12 with Clamping surfaces 16 for the cutting elements 3. The fastening screws 9 are screwed into the openings of the clamping wedges 8, on the other hand in radial threaded bores 15 in the reinforced base body 7 of the milling disks

1 and 2 can be screwed in. To facilitate the chip flow, the clamping fingers 12 have concave upper surfaces whose curvature is adapted to the curvature of the chip pockets 6. The clamping wedges 8 are in recesses 14 of the reinforced base body 7 of the milling disks 1 or

2 used.

The formation of a clamping wedge 8 results from FIGS. 4, 5 and 6. that a radial opening 13 for receiving the fastening screw 9 is provided in a cuboid base body 10 is. The clamping finger 12 is formed in one piece with a side surface 11 of the cuboid base body 10, the pressure surface 16 of which runs obliquely to an associated radius 17. The angle between the Clamping surface 16 and the associated radius 17 is approximately 10 °. In a preferred embodiment the inclined clamping surface 16 protrudes beyond a side surface 19 of the cuboid base body 10.

130062/0399

-Sf-

The clamping finger 12 of the clamping wedge 8 can, for example can be seen in Fig. 5 / (in the direction of rotation of the side milling cutter) be arranged on the left side, or in an analogous design, on the right surface or in the middle.

An embodiment of a preferred application Indexable insert 3 is shown in FIG. 7. The insert is a double-V-shaped insert formed, wherein V-shaped end regions 21 ', 21 "are integrally formed on a rectangular central part. Each end region 21 'and 21 "each have a front-side cutting edge 22' or 22" and a rear-side cutting edge 23 'or 23 ". The design is such that the front cutting edges 22 ', 22 "and the rear cutting edges Cutting edges 23 ', 23 "are diametrically opposite.

As indicated in FIGS. 1 to 3, several side-by-side milling cutters 1 and 2 can be used with the cutting elements 3 formed teeth are arranged offset from one another and combined to form a set milling cutter. Included the individual milling disks are braced or screwed together or against one another in an expedient manner.

The invention is not limited to those shown and described Embodiments limited. It can also be used in an equally advantageous manner with whirling cutters or Use internal milling cutters, in which case the milling disks are no longer circular, but, for example, like a circular ring are formed, on the inner annular surface of the cutting elements 3 and the clamping wedges 8 in the described Way are arranged.

The cutting inserts can have steps ground in a manner known per se in order to separate narrow chips

130QS210399

achieve that can be easily discharged.

The invention also includes all specialist modifications and developments as well as partial and sub-combinations the features and measures described and / or shown.

130062/039 $

List of reference symbols

1 milling disc

2 milling disc

3 cutting element (indexable insert)

4 offset narrow cutter carriers from

5 pocket for 3

6 chip pocket

7 reinforced body

8 clamping element (clamping wedge)

9 fixing screw

10 cuboid base cap of

11 side surface of 8 resp.

12 clamping fingers

13 opening in 10

14 recess in

15 radial threaded hole

16 clamping surface from

17 associated radius

18 concave (top surface of 12)

19 area of 10

20 rectangular middle part of 21'V-shaped end areas 21 '' V-shaped end areas

22 'front cutting edges 22' 'front cutting edges

23 'rear cutting edges 23 '' cutting edges on the back a penetration depth

130062/0399

Claims (8)

PATENTANWÄLTE DiPL.-ING. H. STEHMANN * DIPL.-PHYS. DR. K. SCHWEINZEFT * D-8500 NUREMBERG 70 ESSENWEINSTRASSE 4-6 TELEPHONE 0911/20 3727 O TELEX 06-23135 Nuremberg, 6/26/80 17/64/63 Sitzmann & Heinlein GmbH, Bahnhofstr. 11-13, 8502 Zirndorf Expectations ί 1.) Side milling cutters, in particular for narrow recesses or cutting widths, with cutting elements, in particular indexable inserts, whereby clamping elements are used to fasten the cutting elements to the milling disk, preferably for use in a set milling cutter for milling gearboxes or for recessing camshafts or the like, characterized in that the milling disc (1) each of the penetration depth (a) adapted, narrow cutter carriers (4) which merge into a reinforced base body (7) and pockets (5) for receiving the cutting elements (3) and chip pockets (6) for Receiving the clamping elements (8) has that the clamping elements (8) are designed as clamping wedges which can be fastened radially to the reinforced base body (7) of the milling disc (1) by means of screws (9), with an approximately cuboid base body (10) on one side surface (11) is integrally formed a radially extending clamping finger (12) that the axial depth of the clamping finger (12) is about d it corresponds to the axial depth of the grooving depth (a) adapted narrow cutter carrier (4) of the milling disc (1) and that a radial opening (13) is provided approximately centrally in the cuboid base body (10) for receiving a fastening screw (9) for the clamping wedge ( 8) in a recess (14) of the reinforced base body (7) of the milling disc (1), which is provided with a radial threaded hole (15) for the fastening screw (9). ¹ J 3 ^ Q β 2/0 39 9 PATENT ADVOCATE FROM 1930 TO 1980 "APPROVED REPRESENTATIVE BEFORE THE EUROPEAN PATENT OFFICE ORDINAL INSPECTED 2. Disc milling cutter according to claim 1, characterized in that the clamping finger (12) has a clamping surface (16) inclined to the associated radius (17) for the cutting elements (3). 3. Disk milling cutter according to claim 2, characterized in that the angle between the clamping surface (16) and the associated radius (17) is approximately 10 °. 4. Disk milling cutter according to claim 2 or 3, characterized in that the clamping surface (16) protrudes beyond the associated surface (19) of the cuboid base body (10) of the clamping wedge (8). 5. Disk milling cutter according to claim 1 or following, characterized in that the clamping finger (12) has one of the chip pockets (6) in the milling disk (1) adapted, concave upper surface (18) to facilitate the chip flow. 6. Disk milling cutter according to claim 1 or the following, characterized by double-V-shaped indexable inserts (3) as cutting elements. 7. Disk milling cutter according to claim 6, characterized in that the double-V-shaped indexable insert (3) has two V-shaped widened end regions (21 ', 21''), each with a front side, on an approximately rectangular central part (20) (22 ', 22 ") and a rear (23 ¹ , 23 *') cutting edge, the front (22 ', 22") and the rear (23', 23 ") cutting of the two end regions (21 ') , 21 ¹¹ ) are each diagonally opposite. 130062/0399 8. Set milling cutter, consisting of several side milling cutters according to one or more of claims 1 to 7, characterized in that the individual side milling cutters (1, 2) are arranged offset in the circumferential direction with respect to the teeth formed by the cutting elements (3) and are braced against one another.