# US 2023/0264381 A1 · Machining tool

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- Number: US 2023/0264381 A1
- Document ID: US20230264381A1
- Status: Published application
- Kind: A1
- Application number: 18/174,420
- Filed: 2023-02-24
- Published: 2023-08-24
- Earliest claimed: 2022-02-24
- Assignees: Ledermann GmbH & Co. KG
- Applicants: Ledermann GmbH & Co. KG
- Inventors: Martin Dressler; Holger Grotzke
- Web page: https://patentgrep.com/patent/US20230264381A1

## CPC

- B27G 13/02: in the shape of long arbors, i.e. cylinder cutting blocks (B27G13/12 takes precedence)
- B23C 5/04: Plain cutters, i.e. having essentially a cylindrical or tapered cutting surface of substantial length (B23C5/10 takes precedence)
- B23C 5/18: with permanently-fixed cutter-bits or teeth
- B23C 2210/0485: Helix angles
- B23C 2210/086: Discontinuous or interrupted cutting edges
- B23C 2250/16: Damping vibrations
- B27G: ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS (tools for grinding B24D; sawing tools B27B33/00; tools for slotting or mortising machines B27F5/02; tools for the manufacture of wood shavings, chips, powder or the like B27L11/00); SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B23C: MILLING (broaching B23D; broach-milling in making gears B23F; arrangement for copying or controlling B23Q)

## Abstract

A machining tool has a main body with a carrier surface. Cutting bodies each having a cutting edge are arranged on the carrier surface, the edges rotating in a direction of rotation which runs around an axis of rotation during the machining. The edges of a group including a plurality of cutting bodies overlap in a gapless manner with respect to the direction perpendicular to the direction of rotation and form an overall edge. All of the edges are arranged between end points of the overall edge. The group has a minimum number of teeth defined by the number of edges at least situated one behind the other in the direction of rotation in an intermediate region of the overall edge. The edges of the group overlap with respect to the direction perpendicular to the direction of rotation such that the minimum number of teeth is at least two.

## Claims

### Claim 1

A machining tool for machining materials, the machining tool being configured to be driven in rotation about an axis of rotation, the machining tool comprising:
a main body defining a cutter carrier surface, wherein the axis of rotation runs through said main body;
a plurality of cutting bodies each having a cutting edge and being arranged on said cutter carrier surface;
said cutting edges being configured to rotate in a direction of rotation which runs around the axis of rotation during the machining;
wherein said cutting edges of a group including a multiplicity of said plurality of cutting bodies overlap in a gapless manner with respect to a direction perpendicular to the direction of rotation and thus form an overall cutting edge;
one of said cutting edges of said group being an initial cutting edge of said overall cutting edge;
one of said cutting edges of said group being a final cutting edge of said overall cutting edge;
an intermediate region of the overall cutting edge lying completely between said initial cutting edge and said final cutting edge with respect to the direction perpendicular to the direction of rotation;
all of said cutting edges of the machining tool being arranged between a first end point of said overall cutting edge and a second end point of said overall cutting edge;
said first end point being assigned to said initial cutting edge and said second end point being assigned to said final cutting edge;
the machining tool defining an imaginary helix line running from said initial cutting edge to said final cutting edge;
said imaginary helix line defining a central axis which corresponds to the axis of rotation;
said imaginary helix line running at least partially around said central axis;
said imaginary helix line having a gradient which corresponds to a quotient of a progression of said imaginary helix line in the direction perpendicular to the direction of rotation and a progression of said imaginary helix line with regard to an angle of rotation about the axis of rotation;
all of said cutting edges of said group being at least partially arranged on said imaginary helix line;
said group having a minimum number of teeth, wherein said minimum number of teeth is defined by a number of said cutting edges of said group that are at least situated in succession in the direction of rotation of the machining tool in said intermediate region of said overall cutting edge; and,
said cutting edges of said group overlap with respect to the direction perpendicular to the direction of rotation such that said minimum number of teeth is at least two.

### Claim 2 (depends on 1)

The machining tool of claim 1, wherein said cutting edges of said overall cutting edge in each case only partially mutually overlap with respect to the direction perpendicular to the direction of rotation.

### Claim 3 (depends on 1)

The machining tool of claim 1, wherein each of said cutting edges of said group has exactly one reference point; and, said reference points of said cutting edges of said group are spaced apart from one another in the direction perpendicular to the direction of rotation.

### Claim 4 (depends on 3)

The machining tool of claim 3, wherein said reference points of said cutting edges of said group that are directly adjacent in the direction perpendicular to the direction of rotation are arranged with an angular spacing to one another with respect to the axis of rotation; each of said angular spacings are integer multiples of angle values; and, wherein said angle values lie in an angle range of 10° to 350°.

### Claim 5 (depends on 4)

The machining tool of claim 4, wherein the angle values lie in an angle range of +/−5° with respect to a golden angle, a sum of the golden angle and an opposite angle producing a round angle and a ratio of said golden angle to said opposite angle being equal to a ratio of said opposite angle to said round angle.

### Claim 6 (depends on 4)

The machining tool of claim 4, wherein said angular spacings correspond to one times said angle values from said angle range.

### Claim 7 (depends on 3)

The machining tool of claim 3, wherein said reference points are spaced apart from one another in at least one of the direction of the axis of rotation and a radial direction with respect to the axis of rotation.

### Claim 8 (depends on 1)

The machining tool of claim 1, wherein said main body has a circumferential surface with respect to the axis of rotation; said main body is delimited by an end surface in the direction of the axis of rotation; and, said plurality of cutting bodies of said group are arranged on at least one of said circumferential surface and said end surface.

### Claim 9 (depends on 1)

The machining tool of claim 1, wherein at least one of: said cutting edges of said group each have an axial width measured in the direction of the axis of rotation, and said cutting edges of said plurality of cutting bodies each have a radial width measured in a radial direction with respect to the axis of rotation.

### Claim 10 (depends on 9)

The machining tool of claim 9, wherein each of said cutting edges of said group has exactly one reference point; and at least one of:
said reference points of said group which are directly adjacent in the direction perpendicular to the direction of rotation are arranged with an axial spacing, measured in the direction of the axis of rotation, to one another; and,
said reference points of said group which are adjacent in the direction perpendicular to the direction of rotation are arranged with a radial range spacing to one another, said radial range spacing corresponding to a difference between a larger radial spacing and a smaller radial spacing of said reference points which are radially adjacent of one another.

### Claim 11 (depends on 10)

The machining tool of claim 10, wherein at least one of:
said axial spacing lies in a range from 1% to 50% of a greatest axial width; and,
said radial range spacing lies in a range from 1% to 50% of a greatest radial width.

### Claim 12 (depends on 9)

The machining tool of claim 9, wherein said cutter carrier surface has, in the direction of rotation, behind at least one of said initial cutting edge and said final cutting edge, a peripheral region which extends over at least one of an entirety of said axial width and an entirety of said radial width of said initial cutting edge and/or said final cutting edge, said peripheral region running around the axis of rotation; and,
at least one further cutting body is arranged in the peripheral region in addition to the plurality of cutting bodies of said group.

### Claim 13 (depends on 9)

The machining tool of claim 9, wherein at least one of said axial width and said radial width of at least the initial cutting edge and/or of at least the final cutting edge is greater or smaller than that of said cutting edges of said cutting bodies outside of said peripheral region.

### Claim 14 (depends on 9)

The machining tool of claim 9, wherein each of said cutting edges of said group has exactly one reference point; and, at least one of:
said axial spacings of all of said reference points of said group which are directly adjacent in the direction of the axis of rotation are of equal size; and,
all of said reference points of said group which are directly adjacent in the radial direction with respect to the axis of rotation define radial range spacings of equal size.

### Claim 15 (depends on 1)

The machining tool of claim 1, wherein the machining tool comprises only a single group of said cutting bodies; said cutting edges of said single group overlap, between said first end point and said second end point of said overall cutting edge, in a gapless manner with respect to the direction perpendicular to the direction of rotation; and, said cutting edges of said single group are at least partially arranged on said imaginary helix line.

### Claim 16 (depends on 1)

The machining tool of claim 1, wherein said minimum number of teeth is at least three.

### Claim 17 (depends on 1)

The machining tool of claim 1, wherein said gradient of said imaginary helix line is constant.

### Claim 18 (depends on 3)

The machining tool of claim 3, wherein said reference points lie in a center of a corresponding one of said cutting edges in the direction perpendicular to the direction of rotation.

### Claim 19 (depends on 6)

The machining tool of claim 6, wherein said angular spacings are all of equal size.

### Claim 20 (depends on 4)

The machining tool of claim 4, wherein the angle values lie in an angle range of +/−0.5° with respect to a golden angle, a sum of the golden angle and an opposite angle producing a round angle and a ratio of said golden angle to said opposite angle being equal to a ratio of said opposite angle to said round angle.