DE8305928U1 - GEARING OR FINGER MILLING WITH INSERTED KNIVES - Google Patents

Description

The invention relates to hob cutters or pinger milling cutters that are used Knives and aims to create a simple but robust construction of such a milling cutter.

According to one aspect of the invention, a hobbing or End mill with inserted knives a body which comprises a body of revolution and in which a plurality

in

of circumferentially spaced, extending / axial direction, dovetail-shaped slots are formed, and the blades with dovetail-shaped Feet or base parts are rigidly attached in the respective slots with the aid of an adhesive.

According to another aspect of the invention, a hob cutter with inserted blades comprises a cylindrical body in which a plurality of circumferentially spaced, axially extending, dovetail-shaped slots are formed, the blades in the form of exposed or undercut spirally or helically toothed Racks are arranged in the respective slots that the cutting edges of their teeth on at least one continuous _? helical line, each blade having a dovetail foot rigidly secured in its associated slot by means of an adhesive; furthermore, end plates are attached to the body, which serve to additionally clamp the knives axially in the body.

The invention is described below using an exemplary embodiment with reference to the drawing; in this shows:

Fig. 1 is an axial section through a finished

Hob with inserted knives, the knives shown semi-schematically are;

• - ••••

Pig. 2 shows a section along the line 2-2

from Fig. 1;

3 shows an axial section, the semi-schematic one

Reproduces knives fixed in a makeshift body in an intermediate stage of manufacture; and

4 shows a section along the line 4-4

from Fig. 3.

Referring to Figs. 1 and 2, a hob with inserted blades comprises a cylindrical final body 10 in which an axial bore 11 is formed with a keyway 12, which is used to mount the milling cutter in a driving manner on the tool spindle of a gear hobbing machine; furthermore, the body 10 includes a plurality of circumferentially spaced axially extending dovetail shapes Slots 13. Furthermore, the milling cutter comprises knives 14 in the form of undercut, helical shapes toothed or helically toothed cream bars, each with a dovetail-shaped foot 15, which is arranged in a very tight or precise fit in one of the slots 13 and has beveled edges. One side surface of each slot 13 lies in a plane 16 which runs radially with respect to the body 10, so that spiral or helical tooth gaps 17 can be roughly shaped in knife blanks, when these blanks are fitted into corresponding slots 18 with a slightly larger cross-section in a first temporary body 19 (see FIGS. 3 and 4) so that the leading or leading side surfaces 20 (i.e. those side surfaces which are adjacent to the cutting edges 21 are) the knife feet 15 touch the radial side surfaces of the slots 18, the blanks individually

* M HI

• * · ι

adjustable by means of pressure screws with a point or adjusting screws 22 with hexagon socket are clamped in the axial direction, these adjusting screws 22 of annular temporary end plates 23 are worn, which are attached to the first Behelfsbzw. Auxiliary body 19 with the help of cylinder head screws 24 are fastened with a hexagon socket. The spiral or helical tooth spaces 17 are roughly formed in the blanks with the help of a turning or milling process, whereupon the rough-formed knives 14 can be removed from the first auxiliary body 19 for hardening; then the knife feet 15 are precisely ground. The knives 14 are then with the help of the above-mentioned auxiliary or auxiliary end plates 23 in a second Auxiliary body (not shown) attached, which is identical to the first auxiliary body 19 'with the exception that its slots have exactly the same cross-section as the slots in the final body 10. The knives 14 have the same individual relation to the second body as they had to the first body 19, which enables the surfaces adjoining the cutting edges 21 of the knives 14 and the profiles of their tooth gaps 17 through Grinding operations can be completed exactly. At this stage of manufacture, these areas have a positive Angle of attack of, for example, 18 °. It should be noted that the first and second auxiliary bodies and the Auxiliary end plates 23 are manufacturing aids that repeated Times can be used. The knives 14 are then removed from the second auxiliary body and placed in the final one Body 1O fitted without their sequential positions are changed to one another, so that the non-leading Side surfaces 25 of their feet 15 now touch the radial side surfaces of the slots 13. This reversal of Knife 14 with respect to the slots without changing their rows follow tilts it in one direction, leaving an exemption

their cutting edges 21 is obtained, which continues a continuous helical path or more than take such a path if the hob is multi-thread. The faces adjacent to these edges now have a zero angle of attack, for example.

In fitting the finished knives 14 into the final body 10, an adhesive, for example a superglue is only applied to the leading side surface 20 of each knife, around the knife 14 to be fixed rigidly in their associated slots 13. The end surfaces 26 of the body 10 and the blades 14 are then ground to fit together align and finally final ring end plates 27 on body 10 by means of socket head cap screws 28 attached in order to additionally clamp the knives 14 in the body 10 in the axial direction. The invention is

milling cutter

Applicable in the same way to fingers in which the blades or knives are exposed or undercut, however are not provided with teeth.

Thus, the invention creates a hobbing cutter or milling cutter with inserted knives that is simple but robust Has structure and comprises a cylindrical body in which a plurality of circumferentially spaced, in axially extending dovetail-shaped slitter is provided and the knife or blade with Has dovetail feet that are rigidly attached in the corresponding slots with the aid of an adhesive which is applied only to the leading side surfaces of the feet; are still on the body End plates attached to the knives. Additionally in axial Direction to clamp in the body. The knives of such a hob cutter include back-turned or exposed ones.

rait helical toothed racks which are arranged in the corresponding slots so that the cutting edges of their teeth lie on at least one continuous union spiral or helical path, while the knives of a corresponding end mill
are also released or undercut but not provided with teeth.

Claims (4)

Protection claims 1. Hob or end mill with inserted knives, characterized in that it has a body which comprises a body of revolution and in which a plurality of circumferentially spaced, axially extending, dovetail-shaped slots is formed, and that Knife with dovetail-shaped feet or base parts are rigidly attached in the respective slots with the help of an adhesive. j 2. Milling cutter according to claim 1, characterized in that g e k e η η - 'shows that the adhesive only applies to the j rende or leading side surface of the swallow applied to the tail-shaped foot of each knife is. 3. Hob with inserted knives, thereby characterized in that it comprises a cylindrical body in which a plurality of circumferentially spaced, axially extending, dovetail-shaped slots is formed, that knives in the form of _{undercut v} or exposed spirally or helically shaped '· Toothed racks in the respective slots so are arranged that the cutting edges of their teeth on at least one continuous, helical Path lie that each knife has a dovetail-shaped foot, which with the help of a Adhesive is rigidly attached in the associated slot and that end plates are attached to the body through which the knives can also be axially clamped in the body. 4. Milling cutter according to claim 3, characterized in that the adhesive is only on the leading one or front side surface of the dovetail Is applied to the foot of each knife.