# US 2026/0208277 A1 · Milling tool body and a milling tool

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- Number: US 2026/0208277 A1
- Document ID: US20260208277A1
- Status: Published application
- Kind: A1
- Application number: 19/140,885
- Filed: 2023-11-22
- Published: 2026-07-23
- Earliest claimed: 2022-12-21
- Assignees: Seco Tools AB
- Applicants: Seco Tools AB
- Inventors: Dirk HEMELINGS
- Web page: https://patentgrep.com/patent/US20260208277A1

## CPC

- B23C 5/28: Features relating to lubricating or cooling
- B23C 5/006: {Details of the milling cutter body}
- B23C 9/00: Details or accessories so far as specially adapted to milling machines or cutter (drives, control devices, or accessories, in general B23Q)
- B23C 5/06: Face-milling cutters, i.e. having only or primarily a substantially flat cutting surface
- B23C 5/2278: {for plate-like cutting inserts fitted on an intermediate carrier, e.g. shank fixed in the cutter body}
- B23C 2210/168: Seats for cutting inserts, supports for replacable cutting bits
- B23C 2226/33: Elastomers, e.g. rubber
- B23C 2226/61: Plastics not otherwise provided for, e.g. nylon
- B23C 2260/68: Rings
- B23C 2260/72: Seals
- B23C 2260/80: Serrations
- B33Y 80/00: Products made by additive manufacturing
- B23C: MILLING (broaching B23D; broach-milling in making gears B23F; arrangement for copying or controlling B23Q)
- B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING

## Abstract

A milling tool body for a milling tool includes an axial front end surface, an axial rear end surface, a peripheral mantle surface extending between the axial front end surface and the axial rear end surface, a front end, a rear end being configured for attachment of the milling tool to a machine, at least two insert seats and associated chip pocket being entirely provided in the front end. A cooling duct system is extends from at least one coolant inlet arranged in a first ring-shaped section of the peripheral mantle surface to at least one coolant outlet arranged in a second ring-shaped section of the peripheral mantle surface. The first and the second ring-shaped sections are flanked by sealing surfaces formed as surfaces of revolution, preferably as circular cylindrical surfaces.

## Claims

### Claim 1

A milling tool body for a milling tool, the milling tool body comprising:
an axial front end surface;
an axial rear end surface opposite to the axial front end surface;
a peripheral mantle surface extending between the axial front end surface and the axial rear end surface;
a front end extending from the axial front end surface toward the axial rear end surface;
a rear end extending from the axial rear end surface toward the front end, the rear end being configured for attachment of the milling tool to a machine;
a first longitudinal centre axis extending between the axial front end surface and the axial rear end surface, the tool body being rotatable around the first longitudinal centre axis in a direction of rotation;
at least two insert seats being entirely provided in the front end and distributed in a circumferential direction of the milling tool body, each of the at least two insert seats being configured to accommodate a cutting insert;
a chip pocket provided in front of each of the at least two insert seats in the direction of rotation and delimited by a chip pocket wall entirely provided in the front end;
at least one coolant inlet and at least one coolant outlet; and
a cooling duct system extending from the at least one coolant inlet to the at least one coolant outlet, wherein the cooling duct system is arranged such that coolant supplied via the at least one coolant inlet flows through the cooling duct system to the at least one coolant outlet without leaving the milling tool body along its way between the at least one coolant inlet and the at least one coolant outlet, wherein the at least one coolant inlet is arranged in a first ring-shaped section of the peripheral mantle surface, and the at least one coolant outlet is arranged in a second ring-shaped section of the peripheral mantle surface, wherein the first and the second ring-shaped sections are separated from each other by an intermediate ring-shaped section of the peripheral mantle surface, wherein the first ring-shaped section is flanked by a third ring-shaped section of the peripheral mantle surface such that the first ring-shaped section is axially located between the intermediate ring-shaped section and the third ring-shaped section when seen in a direction of the first longitudinal centre axis, wherein the second ring-shaped section is flanked by a fourth ring-shaped section of the peripheral mantle surface such that the second ring-shaped section is axially located between the intermediate ring-shaped section and the fourth ring-shaped section when seen in the direction of the first longitudinal centre axis, and wherein the first, the second, the third, the fourth ring-shaped section and the intermediate ring-shaped section extend between the front end and the axial rear end surface, wherein each of the third, the fourth and the intermediate ring-shaped section is a surface of revolution created by a 360° rotation of a curve or a line around the first longitudinal centre axis of the milling tool body, and is arranged to be a sealing surface and co-operate with a sealing ring arrangement.

### Claim 2 (depends on 1)

The milling tool body according to claim 1, wherein the at least one coolant inlet is arranged in a first groove in the milling tool body arranged between the third ring-shaped section and the intermediate ring-shaped section, and/or wherein the at least one coolant outlet is arranged in a second groove in the milling tool body arranged between the fourth ring-shaped section and the intermediate ring-shaped section.

### Claim 3 (depends on 2)

The milling tool body according to claim 2, wherein the first groove is a first annular groove, and/or the second groove is a second annular groove.

### Claim 4 (depends on 1)

The milling tool body according to claim 1, wherein the coolant duct system extends partly within the front end, preferably and intersecting a first plane that is perpendicular to the first longitudinal rotation centre axis, wherein the first plane intersects each chip pocket provided in front of each of the at least two insert seats and/or wherein the first plane intersects each of the at least two insert seats.

### Claim 5 (depends on 1)

The milling tool body according to claim 1, wherein each of the third, the fourth and the intermediate ring-shaped section is circular cylindrical and each have a substantially same diameter.

### Claim 6 (depends on 5)

The milling tool body according to claim 5, wherein the third, the fourth and the intermediate ring-shaped section is arranged on a first common imaginary cylinder, wherein the milling tool body is arranged such that the first common imaginary cylinder completely encloses the milling tool body in a region from the axial rear end surface to one of the third and the fourth ring-shaped section that is arranged further away from the axial rear end surface than the other one of the third and the fourth ring-shaped section, and/or wherein the milling tool body is arranged such that the first common imaginary cylinder completely encloses the milling tool body in a region from the axial front end surface to one of the third and the fourth ring-shaped sections that is arranged further away from the axial front end surface than the other one of the third and the fourth ring-shaped section.

### Claim 7 (depends on 1)

The milling tool body according to claim 1, wherein the at least one coolant inlet is a plurality of coolant inlets, wherein the at least one coolant outlet is a plurality of coolant outlets, wherein the coolant duct system includes a plurality of coolant channels, and wherein each coolant channel of the plurality of coolant channels extends from only one coolant inlet of the plurality of coolant inlets to only one coolant outlet of the plurality of the coolant outlets.

### Claim 8 (depends on 1)

A milling tool comprising:
a milling tool body according to claim 1;
a coolant ring, the coolant ring including an outer periphery and an inner peripheral surface, the inner peripheral surface includes a first, a second, a third, a fourth and an intermediate ring-shaped section, wherein each of the third, the fourth and the intermediate ring-shaped section of the inner peripheral surface is a surface of revolution created by a 360° rotation of a curve or a line around a common second longitudinal centre axis, and is arranged to be a sealing surface and co-operate with a sealing ring arrangement, wherein the coolant ring is arranged to be mounted onto the milling tool body such that the inner peripheral surface of the coolant ring encircle the peripheral mantle surface of the milling tool body and such that the first, the second, the third, the fourth and the intermediate ring-shaped section of the inner peripheral surface of the coolant ring face the first, the second, the third, the fourth and the intermediate ring-shaped section respectively of the peripheral mantle surface of the milling tool body;
a first sealing ring arrangement arranged to be mounted between and co-operate with the third ring-shaped section of the peripheral mantle surface of the tool body and the third ring-shaped section of the inner peripheral surface of the coolant ring;
a second sealing ring arrangement arranged to be mounted between and co-operate with the fourth ring-shaped section of the peripheral mantle surface of the tool body and the fourth ring-shaped section of the inner peripheral surface of the coolant ring;
a third sealing ring arrangement arranged to be mounted between and co-operate with the intermediate ring-shaped section of the peripheral mantle surface of the tool body and the intermediate ring-shaped section of the inner peripheral surface of the coolant ring, wherein the coolant ring, the first, the second and the third sealing ring arrangement are arranged such that when mounted onto the tool body, the second longitudinal centre axis substantially coincides with the first longitudinal centre axis, a first annular coolant channel is formed between the first ring-shaped section of the peripheral mantle surface and the first ring-shaped section of the inner peripheral surface of the coolant ring, and sealed in an axial direction by the first sealing ring arrangement and the third sealing ring arrangement, a second annular coolant channel is formed between the second ring-shaped section of the peripheral mantle surface and the second ring-shaped section of the inner peripheral surface of the coolant ring, and sealed in axial direction by the second sealing ring arrangement and the third sealing ring arrangement, and the milling tool body is rotatable relative the coolant ring, wherein the coolant ring is provided with at least one coolant delivery channel arranged to be in communication with the first annular channel, wherein the coolant ring is furthermore provided with at least one coolant return channel arranged to be in communication with second annular coolant channel, each of the at least one coolant delivery channel extends from a coolant inlet in the outer periphery of the coolant ring to an orifice in the first ring-shaped section of the inner peripheral surface of the coolant ring, and each of the at least one coolant return channel extends from an orifice in the second ring-shaped section of the inner peripheral surface of the coolant ring to a coolant outlet in the outer periphery of the coolant ring, the coolant ring including fastening means arranged for fastening of the coolant ring to the external of the machine when the milling tool is mounted in the machine in order to prevent movement and rotation of the coolant ring.

### Claim 9 (depends on 8)

The milling tool according to claim 8, wherein the coolant ring is arranged with a first, a second and a third annular groove in the inner peripheral surface, the first, the second and the third annular groove being arranged to accommodate the first, the second and the third sealing ring arrangement respectively, when the coolant ring, the first, the second and the third sealing ring arrangement are mounted onto the tool body, or wherein the milling tool body is arranged with a third, a fourth and a fifth annular groove in the peripheral mantle surface, wherein the third, the fourth and the fifth annular groove are arranged to accommodate the first, the second and the third sealing ring arrangement respectively, when the coolant ring, the first, the second and the third sealing ring arrangement are mounted onto the tool body.

### Claim 10 (depends on 8)

The milling tool according to claim 8, wherein each of the first, the second and the third sealing ring arrangement includes a first sealing ring and a second sealing ring, wherein the first and the second sealing ring of each of the first, the second and the third sealing ring arrangement are concentric to each other such that one has a smaller diameter and is arranged radially inward from another one and closer to the first longitudinal centre axis when the coolant ring, the first, the second and the third sealing ring arrangement are mounted onto the milling tool body.

### Claim 11 (depends on 10)

The milling tool according to claim 10, wherein the first sealing ring of each of the first, the second and the third sealing ring arrangement is made of hard plastic, such as polytetrafluoroethylene PTFE, and the second sealing ring of each of the first, the second and the third sealing ring arrangement is made of an elastomer, such as fluorinated propylene monomer FPM.

### Claim 12 (depends on 11)

The milling tool according to claim 11, wherein the coolant ring is arranged with a first, a second and a third annular groove in the inner peripheral surface, the first, the second and the third annular groove being arranged to accommodate the first, the second and the third sealing ring arrangement respectively, when the coolant ring, the first, the second and the third sealing ring arrangement are mounted onto the tool body, wherein the first and the second sealing ring of each of the first, the second and the third sealing ring arrangement are arranged such that the first sealing ring has a smaller diameter than the second sealing ring and is in contact and co-operates with the peripheral mantle surface of the milling tool body when the coolant ring, the first, the second and the third sealing ring arrangement are mounted onto the tool body.

### Claim 13 (depends on 11)

The milling tool according to claim 11, wherein the milling tool body is arranged with a third, a fourth and a fifth annular groove in the peripheral mantle surface, wherein the third, the fourth and the fifth annular groove are arranged to accommodate the first, the second and the third sealing ring arrangement respectively, when the coolant ring, the first, the second and the third sealing ring arrangement are mounted onto the tool body, wherein the first and the second sealing ring of each of the first, the second and the third sealing ring arrangement are arranged such that the first sealing ring has a larger diameter than the second sealing ring and is in contact and co-operates with inner peripheral surface of the coolant ring when the coolant ring, the first, the second and the third sealing ring arrangement are mounted onto the tool body.

### Claim 14 (depends on 8)

The milling tool according to claim 8, wherein the coolant ring is provided with an annular surface at an axial end portion of the coolant ring, the annular surface is arranged to abut an annular surface provided on the milling tool body when the coolant ring, the first, the second and the third sealing ring arrangement are mounted onto the tool body in order to facilitate mounting of the coolant ring onto the milling tool body in right longitudinal position, the annular surface provided on the milling tool body has its center point substantially arranged on the first longitudinal centre axis, and the annular surface provided on the coolant ring has its center point substantially arranged on the second longitudinal centre axis.

### Claim 15 (depends on 8)

The milling tool according to claim 8, wherein the coolant ring, the first, the second and the third sealing ring arrangement are arranged such that the coolant ring is centered in relation to the milling tool body by the first, the second and the third sealing ring arrangement such that the second longitudinal centre axis substantially coincides with the first longitudinal centre axis when the coolant ring, the first, the second and the third sealing ring arrangement are mounted onto the tool body.

### Claim 16 (depends on 8)

The milling tool according to claim 8, wherein when the coolant ring, the first, the second and the third sealing ring arrangement are mounted onto the tool body, a bearing function between the coolant ring and the milling tool body during a rotary motion of the milling tool body inside the coolant ring is being provided by the first, the second and the third sealing ring arrangement.

### Claim 17 (depends on 8)

The milling tool according to claim 8, wherein the coolant ring has a lower density than the milling tool body.

### Claim 18 (depends on 8)

A system for delivering a coolant, the system comprising:
a milling tool according to claim 8 connected to the system;
a coolant delivering unit connected to the milling tool via the coolant inlet of the at least one coolant delivery channel; and
a coolant return unit connected to the milling tool via the coolant outlet of the at least one coolant return channel.