EP2136952A1

EP2136952A1 - Cylindrical cutter

Info

Publication number: EP2136952A1
Application number: EP08715490A
Authority: EP
Inventors: Jürgen Seidel; Peter Sudau; Jürgen Merz; Matthias Kipping
Original assignee: SMS Siemag AG
Current assignee: SMS Group GmbH
Priority date: 2007-03-21
Filing date: 2008-02-11
Publication date: 2009-12-30
Also published as: TW200848184A; CN101631635A; DE102007014262A1; CA2679959A1; US20110044773A1; KR20090130862A; CN101631635B; RU2009138727A; WO2008113314A1; ZA200905484B; JP2010521329A; RU2433892C2; UA94509C2

Abstract

The invention relates to a cylindrical cutter, the roller body of which comprises grooves provided along the length thereof at a distance from one another and at an angle to the longitudinal axis. Indexable inserts, particularly coated hard metal inserts, are disposed in the grooves. In order to largely prevent axial forces from acting on the milling cutter or on the material to be worked, either the grooves and thus the cutting edges of the indexable inserts are aligned sectionally at different angles, said angles being selected such that the axial forces generated in the one section during the milling process are neutralized or are reduced to a defined degree by the axial forces generated in the neighboring section, or the indexable inserts are disposed or aligned alternately in the grooves such that the axial force generated by one indexable insert during the milling process is neutralized by the axial force generated by the neighboring indexable insert.

Description

rolling mills

The invention relates to a roll mill, which is equipped with indexable inserts, in particular coated carbide inserts.

Roll milling cutters used for machining non-ferrous metal strips or sheets have long been known.

In DE20204478 U1 a roll mill is described on which spiral grooves are formed, in which helix knives (HSS knives) are arranged with quasi-continuous cutting edge, which are held with wedges and screws.

In order to improve the efficiency of the milling process, DE29913164 U1 describes, as known from hedgehog milling cutters, the use of carbide inserts for roll milling cutters. It is advantageous that re-sharpening of the inserts on relatively expensive grinding machines is no longer necessary and the better utilization is achieved by turning the inserts, d. H. 4 or 8 cutting edges of the plate can be used.

Both types of milling cutter have arranged the cutting spirally over the bale length at the periphery of the milling cutter. Furthermore, the inserts have an angle of inclination (eg 10 °) with respect to the axis of rotation. This oblique arrangement is known to have the goal of a gentler cutting and thus to generate a lower dynamic load of the milling cutter and thus the entire machine. Also, this reduces the vibration excitation of the milling process.

However, due to the oblique arrangement of the cutting edges, the milling force also generates a force component in the axial direction. This loads the thrust bearings of the roller mill and leads to transverse forces in the slab or band to be processed, which must be absorbed in the side guides. Especially at the tape head and end of the tape, in which the lateral guide does not act in front of and behind the cutter, the lateral force affects so also negative on the tape. This is especially true for wider bands, higher decreases, or higher strength materials.

The object of the invention is therefore to provide a roller cutter, with the axial forces acting on the cutter or the material to be processed are largely avoided.

This object is achieved according to the invention with a roll mill whose roller body is provided with extending over its length, spaced apart and at an angle to the longitudinal axis grooves, in which indexable inserts, in particular coated carbide inserts are arranged, characterized in that the grooves and so that the cutting edges of the indexable inserts are aligned in sections with different angles, wherein the angles are chosen so that the axial forces arising during the milling process in one section are neutralized or defined small by the axial forces arising in the adjacent section.

Alternatively, the roll mill, the roll body is provided with extending over its length, spaced from each other and at an angle to the longitudinal axis grooves provided in which indexable inserts, in particular coated carbide inserts are arranged, characterized in that the indexable inserts in the grooves alternately arranged or oriented such that the axial force caused by the one indexable insert in the milling process is neutralized by the axial force caused by the adjacent indexable insert.

In general, the effect can also be expressed mathematically according to the following equation: n

Σ (L ₁ x Qi) ^« 0 i = 1

with i = cutting index n = number of cutting edges over the milling cutter length

L ₁ = length of the cutting edge i α, = inclination angle of the cutting edge i

The inclination angle α (or the orientation of the cutting edge) can be positive or be negative and change over the cutter length

According to one embodiment, the grooves or cutting orientation are mirror-symmetrical to a transverse plane through the roll body.

The roller body may also consist of axially juxtaposed discs, which are held together by clamping elements, in which case the grooves and thus the blade orientations extend mirror-symmetrically to the parting plane between the discs in each case two adjacent discs.

Finally, it is possible for a plurality of indexable cutting inserts to be combined in blocks on a holding plate and for the individual holding plates with the cutters fastened thereon to be mounted differently aligned on the roll body. The orientation is then exactly as it has been previously described for the individual indexable inserts.

The sum of the product of cutting length x cutting inclination angle of all cutting edges of the milling cutter should be zero.

A defined low axial force can be generated by choosing a slightly different setting of the cutting edges in a positive direction compared to the negative direction, or the number of cutting edges with a positive inclination being slightly higher than those with a negative inclination.

The orientation of the cutting edges of the inserts can be in the front view of the mill cutter arrow or arcuate in a convex or concave line or zig-zag line.

The invention thus relates to a roll mill, which is equipped with indexable inserts, in particular coated carbide inserts. In this case, however, compared to the prior art, the indexable inserts are oriented so that during the milling process no or at most minimal or defined small axial forces that would act on the milling drum and the material to be processed occur.

The invention will be explained below for better understanding with reference to the drawings. Showing:

1 shows schematically a mill cutter with inventive arrangement of the indexable inserts

2 shows three different arrangement examples of the indexable inserts

3 shows a disk-shaped construction of a roll milling cutter

4 shows a modified embodiment of Figure 1

Fig.5 different cutting formations.

According to the embodiment shown in FIG. 1, the mill cutter consists of a roller body 1 with grooves 2 incorporated in a spiral manner for the two roller halves on the entire roller circumference, in which the indexable inserts 3 are fastened. Details, neither to the attachment nor to the roller bearing, etc., were not shown, since these are not necessary for the understanding here. The cutting edges of the inserts are here arranged quasi arrow-shaped or aligned. Due to the symmetrical arrangement, i. the positioning of the cutting edges both to the left and to the right, cancel the axial force components, so that the axial force is minimal (special case = 0). The guides of the band within the milling machine can be designed so easier with less space and are less burdened. Furthermore, in this embodiment, the chip flight is directed slightly to the side, which favors the chip removal at the top. The gentle cut is still given by the oblique, staggered arrangement of the cutting.

Alternative arrangements and orientations of the blades are shown in FIG. In this case, the example a) corresponds to the embodiment of Figure 1 and is used only to understand the embodiment of b). In the embodiment b), the arrangement of the cutting in the front view is alternatively performed arcuate.

Depending on the desired flying behavior of the chips, the arrangement of the cutting plates according to a) and b) can assume a concave or convex arrangement form, ie the cutting of a row in eg milling center run first in the milling area or at another Curvature direction last into the milling area. Depending on the arrangement, the chips then fly outwards towards the edge of the slab or towards the middle of the slab.

c) corresponds to the known in the above prior art embodiment with respect to the cutting plate assembly. However, every second carbide cutting edge is aligned differently.

In the embodiment of a roll mill shown in FIG. 3, the roll body consists of individual disks in which the pitch direction is alternately changed.

A further advantageous design of a roller cutter can be seen in FIG. 4. Here, carbide indexable inserts are combined block-wise in holding plates 4 (cassettes). These holding plates are in turn mounted on the base body in such a way that the orientation of the cutting, as already stated above, for. B. is arrow-shaped.

In the embodiments, two rows of cutting edges are outlined in more detail. One can thus recognize the overlap by the staggered arrangement of the blades. Several double rows are arranged in the same way on the entire circumference.

The mentioned designs (single-cutter milling cutter, disc milling cutter composed of discs, roller milling cutter equipped with cutting-holder plates) can be combined with the various cutter arrangements.

For the sake of completeness, the desired indexable insert shapes which can be used are shown in FIG. There is provided both a radial and a tangential arrangement of the cutting plates for the roll mill. The plates may be square or rectangular advantageously designed with edge breakage. Coated carbide cutting inserts (indexable inserts) are preferably used.

As already explained, all designs aim at minimizing the milling forces generated during the milling process in the axial direction by means of the cutting arrangement and cutting edge alignment described, and at the same time enabling a gentle dipping of the cutting edge into the workpiece (slab). Alternatively to the target of the axial force = 0, a defined low axial force and axial force direction can also be set. This is advantageously produced by the employment of the Cutting that points to one side is changed slightly to the slope on the other side, or alternatively the number of edges with negative slope is slightly higher, like that with positive slope.

Claims

claims

1. roll mill, the roll body is provided with extending over its length, spaced from each other and at an angle to the longitudinal axis grooves, in which indexable inserts, in particular coated carbide inserts are arranged, characterized in that the grooves and thus the cutting the indexable inserts are aligned in sections with different angles, wherein the angles are selected so that the axial forces arising during the milling process in one section are neutralized or defined small by the axial forces arising in the adjacent section.

2. roll mill, the roll body is provided with extending over its length, spaced from each other and at an angle to the longitudinal axis grooves, in which indexable inserts, in particular coated carbide inserts are arranged, characterized in that the indexable inserts in the grooves alternately are arranged or aligned such that the axial force caused by the one indexable insert in the milling process is neutralized by the axial force caused by the adjacent indexable insert.

3. Roll milling cutter according to claim 1, characterized in that the cutting edge orientation is mirror-symmetrical to a transverse plane through the roll body.

4. Roll mill according to one of the preceding claims, characterized in that the roller body consists of axially juxtaposed discs, which are held together by clamping elements and that in each case two adjacent discs, the grooves and thus the blade orientation mirror-symmetrical to the parting plane between the discs.

5. Roll milling cutter according to one of the preceding claims, characterized in that a plurality of indexable cutting plates are each blockily summarized on a holding plate and the individual holding plates are mounted differently oriented with the cutters mounted thereon on the roll body.

6. Roll milling cutter according to one of the preceding claims, characterized in that for the sum of the product of cutting edge x cutting inclination angle of all cutting edges of the milling drum is zero.

7. Roll milling cutter according to one of the preceding claims, characterized in that a defined low axial force is generated by a slightly different employment of the cutting is selected in positive compared to the negative direction or the number of cutting edges with a positive slope is slightly higher than that with negative inclination.

8. Roll milling cutter according to claim 1, characterized in that the orientation of the cutting in the front view arrow or arcuate in a convex or concave line or zigzag ünie runs.