# US 11,027,340 B2 · Milling head with constant profiles

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- Number: US 11,027,340 B2
- Document ID: US11027340B2
- Status: Granted
- Kind: B2
- Application number: 16/349,750
- Filed: 2017-11-21
- Published: 2020-03-05
- Granted: 2021-06-08
- Earliest claimed: 2016-11-21
- Assignees: Friedrich Gloor AG
- Applicants: Friedrich Gloor AG
- Inventors: Hanspeter Lusti; Daniel Flury
- Web page: https://patentgrep.com/patent/US11027340B2

## CPC

- B23C 5/08: Disc-type cutters
- B23C 5/12: Cutters specially designed for producing particular profiles (B23C5/10 takes precedence)
- B23C 2210/282: Unequal angles between the cutting edges, i.e. cutting edges unequally spaced in the circumferential direction
- B23C: MILLING (broaching B23D; broach-milling in making gears B23F; arrangement for copying or controlling B23Q)

## Abstract

Proposed in a milling head, which has a plurality of machining milling teeth and tooth gaps arranged therebetween, whereby the milling teeth and the tooth gaps are arranged along a circumferential surface of the milling head, which milling head is to be provided with a number of milling teeth, which is greater than and/or substantially equal to the number of milling teeth ascertained using the equation y=a·x5+b·x4+c·x3+d·x2+e·x+f, wherein x is the diameter of the milling head in millimeters and y is the tooth pitch, i.e. the distance between two adjacent milling teeth in millimeters, and it substantially applies that the value of a ranges between a=1.7·10−9 and a=2.3·10−9, the value of b between b=−5·10−7 and b=−11·10−7, the value of c between c=0.7·10−4 and c=1.3·10−4, the value of d between d=8.5·10−3 and d=9.7·10−3, the value of e between e=2.6·10−1 and e=3.7·10−1 and the value of f between f=−1.5·10−1 and f=−2.6·10−1.

## Claims

### Claim 1

A form cutter milling head with a plurality of machining milling teeth and tooth gaps arranged there-between, which are arranged along a circumferential surface of the form cutter milling head, wherein an actual number of said milling teeth is greater than or equal to a calculated number of milling teeth ascertained from the relationship n=C/y wherein n is the number of milling teeth, y is a tooth pitch of the form cutter milling head defined as a distance in millimeters between two said milling teeth situated adjacent to one another, and C is a circumference in millimeters of the form cutter milling head, wherein the tooth pitch relates to a diameter of the form cutter milling head via a fifth-order polynomial of the form y=a·x5+b·x4+c·x3+d·x2+e·x+f, wherein x is the diameter of the milling head in millimeters, y is the aforesaid tooth pitch in millimeters, and a, b, c, d, e, and f are coefficients of the fifth-order polynomial.

### Claim 2 (depends on 1)

The form cutter milling head according to claim 1, wherein a tooth face angle (γ) and/or a clearance angle (α) of the milling teeth remains constant with a resharpening and/or relief grinding of the milling teeth.

### Claim 3 (depends on 1)

The form cutter milling head according to claim 1, said form cutter milling head having form constancy with a profile-constant or logarithmic relief-ground surface.

### Claim 4 (depends on 1)

The form cutter milling head according to claim 1, wherein the milling teeth are arranged with constant spacing along the circumference of the milling head.

### Claim 5 (depends on 1)

The form cutter milling head according to claim 1, wherein the milling teeth are disposed with a spacing varying with respect to one another along the circumference of the milling head.

### Claim 6 (depends on 1)

The milling head according to claim 1, wherein the value of a ranges between a=1.8·10−9 and a=2.2·10−9.

### Claim 7 (depends on 1)

The milling head according to claim 1, wherein the value of b ranges between b=−6·10−7 and b=−10·10−7.

### Claim 8 (depends on 1)

The milling head according to claim 1, wherein the value of c ranges between c=0.8·10−4 and c=1.2·10−4.

### Claim 9 (depends on 1)

The milling head according to claim 1, wherein the value of d ranges between d=8.7·10−3 and d=9.5·10−3.

### Claim 10 (depends on 1)

The milling head according to claim 1, wherein the value of e ranges between e=2.8·10−1 and e=3.5·10−1.

### Claim 11 (depends on 1)

The milling head according to claim 1, wherein the value of f ranges between f=−1.7·10−1 and f=−2.4·10−1.

### Claim 12 (depends on 6)

The milling head according to claim 6, wherein the value of a ranges between a=1.9·10−9 and a=2.1·10−9.

### Claim 13 (depends on 7)

The milling head according to claim 7, wherein the value of b ranges between b=−7·10−7 and b=−9·10−7.

### Claim 14 (depends on 8)

The milling head according to claim 8, wherein the value of c ranges between c=0.9·10−4 and c=1.1·10−4.

### Claim 15 (depends on 9)

The milling head according to claim 9, wherein the value of d ranges between d=8.9·10−3 and d=9.3·10−3.

### Claim 16 (depends on 10)

The milling head according to claim 10, wherein the value of e ranges between e=3.0·10−1 and e=3.3·10−1.

### Claim 17 (depends on 11)

The milling head according to claim 11, wherein the value of f ranges between f=−1.9·10−1 and f=−2.2·10−1.