MILLING CUTTER

• US 20070127992A1
• Filed: 11/24/2006
• Published: 06/07/2007
• Est. Priority Date: 05/27/2004
• Status: Active Grant

• Current Assignee: Kennametal Incorporated
• Original Assignee: Kennametal Incorporated
• Inventors: MANNER, HEINRICH, SPICHTINGER, XAVER
• Granted Patent: US 8,092,124 B2
• Time in Patent Office: Days
• US Class Current: 407/39
• CPC Class Codes: B23C 2210/161 Elastically deformable clamping members
• CPC Class Codes: B23C 5/006 Details of the milling cutter body
• CPC Class Codes: B23C 5/2226 for plate-like cutting inserts fitted on an intermediate carrier, e.g. shank fixed in the cutter body
• CPC Class Codes: B23C 5/2234 for plate-like cutting inserts fitted on a ring or ring segment
• CPC Class Codes: B23C 5/24 adjustable
• CPC Class Codes: B23C 5/2462 the adjusting means being oblique surfaces
• CPC Class Codes: Y10T 407/14 with means to apply fluid to cutting tool
• CPC Class Codes: Y10T 407/1912 Tool adjustable relative to holder
• CPC Class Codes: Y10T 407/1916 And axially
• CPC Class Codes: Y10T 407/1918 Selectively
• CPC Class Codes: Y10T 407/193 Radially
• CPC Class Codes: Y10T 407/1932 with means to fasten tool seat to holder

Abstract

A milling cutter for machining work pieces, which comprises at least one cutting insert, fixed in a recess of the tool base and adjusted by means of an adjusting element. The abstract of the disclosure is submitted herewith as required by 37 C.F.R. §1.72(b). As stated in 37 C.F.R. §1.72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading “Abstract of the Disclosure.” The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims. Therefore, any statements made relating to the abstract are not intended to limit the claims in any manner and should not be interpreted as limiting the claims in any manner.

Claims

1. A milling cutter for machining workpieces comprising:

a base body having a central longitudinal axis and comprising at least one recess;

said at least one recess comprising a first recess;

at least one cutting insert comprising a first cutting insert;

said first recess being configured to receive said first cutting insert;

said first cutting insert being configured to be held in said first recess;

at least one clamping screw comprising a first clamping screw;

said first clamping screw being configured to clamp said first cutting insert to said base body;

said first clamping screw comprising a conical screw head portion and a threaded shank portion;

said screw head portion of said first clamping screw comprising a first screw head end portion and a second screw head end portion;

said second screw head end portion being disposed opposite said first screw head end portion and adjacent said shank portion;

said first screw head end portion being greater in diameter than said second screw head end portion;

said base body having at least one hole disposed therein;

said at least one hole in said base body comprising a first hole;

said first hole in said base body comprising a threaded portion being configured to engage with said threaded shank portion of said first clamping screw to removably hold said first clamping screw in said first hole in said base body;

said first cutting insert having a hole disposed therein;

said threaded shank portion of said first clamping screw being configured to be inserted through said hole in said first cutting insert and screwed into said first clamping hole;

said hole in said first cutting insert comprising a conical inner surface portion;

said conical screw head portion of said first clamping screw being configured and disposed to matingly engage with said conical inner surface portion of said first cutting insert to clamp said first cutting insert to said base body upon screwing in of said threaded shank portion into said first clamping hole;

at least one adjusting screw comprising a first adjusting screw;

said first adjusting screw being configured and disposed to move said first cutting insert along the central longitudinal axis of said base body;

said base body comprising at least one hole;

said at least one hole in said base body comprising a first hole being disposed adjacent said first recess;

said first hole in said base body being configured and disposed to receive and retain said first adjusting screw therein;

said first adjusting screw comprising;

a screw head portion;

a shank portion; and

a conical portion being disposed between and to connect said screw head portion and said threaded shank portion;

said conical portion of said first adjusting screw comprising a first conical portion end portion and a second conical portion end portion;

said second conical portion end portion being disposed opposite said first conical portion end portion and adjacent said shank portion of said first adjusting screw;

said first conical portion end portion being greater in diameter than said second conical portion end portion;

said first adjusting hole comprising a threaded portion and said shank portion of said first adjusting screw comprising a threaded portion, which said threaded portions being configured to engage with one another to removably hold said first adjusting screw in said first adjusting hole;

said screw head portion of said first adjusting screw being configured to be engaged and rotated by a tool to screw said first adjusting screw into said first adjusting hole;

said first cutting insert comprising a cutting end portion and an adjusting end portion disposed opposite said cutting end portion;

said first cutting insert comprising a conical recess formed in the end face of said adjusting end portion;

said conical portion of said first adjusting screw and said conical recess of said first cutting insert each having substantially equivalent conicity to permit mating thereof; and

said conical portion of said first adjusting screw being configured and disposed to matingly engage with at least a substantial portion of said conical recess of said first cutting insert upon screwing in of said first adjusting screw in said first adjusting hole to move said first cutting insert along the central longitudinal axis of said base body to a desired position.

2. The milling cutter according to claim 1, wherein:

the axis of the first adjusting hole is inclined with respect to the axis of the first clamping hole;

the inclination of the axis of the first adjusting hole is one of;

between >

0° and

<

40°

;

20±

10°

; and

12°

;

the first adjusting screw comprises a reduced shank portion between the conical portion and the threaded portion;

the first cutting insert comprises two longitudinal slot portions extending opposite one another away from the hole in the first cutting insert; and

the first cutting insert comprises a cutting edge and a chip flute disposed in the area of the cutting edge.

3. The milling cutter according to claim 2, wherein:

said first recess in said base body comprises a dovetailed recess;

said first cutting insert has an external profile with rounded interior edges adapted to said first dovetailed recess;

said at least one cutting insert comprises a second cutting insert;

said second cutting insert, in mounted condition, is raised over the working surface of said base body as compared with at least said first cutting insert;

said base body has a central passage with a clamping face on which a corresponding collar profile of a screw neck of a plate-shaped fastening screw abuts, forming a ring-shaped coolant channel which runs into a cooling gap formed between the opening rim of the passage and a screw collar overlapping it;

said base body comprises a base carrier and a supporting ring mounted on it, on which said at least one cutting insert can be fixed;

the supporting ring is shrunk onto the base carrier;

the supporting ring is screwed together with the base carrier;

the base carrier is made of aluminum; and

the supporting ring is a steel ring.

4. A milling cutter (1) for machining workpieces, having at least one cutting insert (4) which can be fixed in a recess (21) of a tool base (2) and which can be adjusted by means of an adjusting element (32), characterized by a one-piece adjusting element (32), having an adjusting cone (32b) extending between a screw head (32a) and a threaded shank (32c), which interacts with a conical recess (40) formed into a lateral face (41) of the cutting insert (4).

5. The milling cutter according to claim 4, wherein said milling cutter comprises an adjusting hole (35) spaced from the recess (21) for the cutting insert (4) and having an internal thread corresponding with the threaded shank (32c) of the adjusting element (32) and having a cylindrical opening area (36), in which the screw head (32a) of the adjusting element (32) is guided.

6. The milling cutter according to claim 5, wherein the axis (37) of the adjusting hole (35) is inclined to the axis (38) of a clamping-screw hole (25) for the cutting insert (4).

7. The milling cutter according to claim 6, wherein the inclination (a) of the axis (37) of the adjusting hole (35) lies between α

>

0° and

α

<

40°

, expediently α

=(20±

10)°

, preferably α

=12°

.

8. The milling cutter according to claim 7, wherein:

the adjusting element (32) has a reduced shank portion (32d) between the adjusting cone (32b) and the threaded shank (32c);

the cutting insert (4) is provided in the area of a passage (24) with a longitudinal slot (29) for a clamping screw (23); and

the milling cutter comprises a conical clamping screw (23) for fixing the cutting insert (4) in the recess (21) of the tool base (2).

9. The milling cutter according to claim 8, wherein:

a chip flute (7) is integrated in the cutting insert (4) in the area of a cutting edge (20) carried by the cutting insert (4);

the milling cutter comprises a dovetailed recess (21) in the tool base (2) for receiving the cutting insert (4); and

the cutting insert (4) has an external profile with rounded interior edges (22) adapted to the dovetailed recess (21).

10. The milling cutter according to claim 9, wherein:

a cutting insert (4) which in mounted condition is raised over the working surface (12) of the tool base (2), as compared with any other cutting insert (4);

the tool base (2) has a central passage (8) with a clamping face (13) on which a corresponding collar profile (14) of a screw neck (15) of a plate-shaped fastening screw (10) abuts, forming a ring-shaped coolant channel (16), which runs into a cooling gap (19) formed between the opening rim (11) of the passage (10) and a screw collar (9) overlapping it; and

the tool base (2) comprises a base carrier (2a) and a supporting ring (2b) mounted on it, on which the cutting insert (4) can be fixed.

11. The Milling cutter according to claim 10, wherein:

the supporting ring (2a) is shrunk onto the base carrier (2a);

the supporting ring (2b) is screwed together with the base carrier (2a);

the base carrier (2a) is made of aluminum; and

the supporting ring (2b) is a steel ring.

12. A milling cutter for machining workpieces comprising:

a base body;

at least one cutting insert attached to said base body;

at least one adjusting screw being configured and disposed to move said at least one cutting insert;

said at least one adjusting screw comprising;

a screw head portion;

a shank portion; and

a conical portion being disposed between and to connect said screw head portion and said threaded shank portion;

said at least one cutting insert comprising an adjustment surface; and

said conical portion of said at least one adjusting screw being configured and disposed to engage with said adjustment surface to move said at least one cutting insert.

13. The milling cutter according to claim 12, wherein:

said base body comprises at least one recess configured and disposed to receive said at least one cutting insert; and

said adjustment surface of said at least one cutting insert comprises a conical recess.

14. The milling cutter according to claim 13, wherein:

said base body comprises at least one adjusting hole disposed adjacent said at least one recess in said base body;

said at least one adjusting hole is configured and disposed to receive and retain said at least one adjusting screw; and

said at least one adjusting hole comprises an internal thread corresponding with said threaded shank portion of said at least one adjusting screw.

15. The milling cutter according to claim 14, wherein:

the milling cutter comprises at least one clamping screw configured to clamp said at least one cutting insert to said base body;

said at least one cutting insert has a hole disposed therein configured to permit said at least one clamping screw to pass therethrough;

said base body comprises at least one clamping hole disposed in said at least one recess; and

said at least one clamping hole is configured and disposed to receive and retain said at least one clamping screw.

16. The milling cutter according to claim 15, wherein:

the axis of said at least one adjusting hole is inclined with respect to the axis of said at least one clamping hole; and

the inclination of the axis of said at least one adjusting hole is one of;

between >

0° and

<

40°

;

20±

10°

; and

12°

.

17. The milling cutter according to claim 16, wherein:

said at least one adjusting screw comprises a reduced shank portion between said conical portion and said threaded portion;

said at least one cutting insert comprises two longitudinal slot portions extending opposite one another away from the hole in said at least one cutting insert; and

said at least one cutting insert comprises a cutting edge and a chip flute disposed in the area of the cutting edge.

18. The milling cutter according to claim 17, wherein:

said at least one recess in said base body comprises a dovetailed recess; and

said at least one cutting insert has an external profile with rounded interior edges adapted to said at least one dovetailed recess.

19. The milling cutter according to claim 18, wherein:

said at least one cutting insert comprises a first and a second cutting insert;

said second cutting insert, in mounted condition, is raised over the working surface of said base body as compared with at least said first cutting insert; and

said base body has a central passage with a clamping face on which a corresponding collar profile of a screw neck of a plate-shaped fastening screw abuts, forming a ring-shaped coolant channel which runs into a cooling gap formed between the opening rim of the passage and a screw collar overlapping it.

20. The milling cutter according to claim 19, wherein:

said base body comprises a base carrier and a supporting ring mounted on it, on which said at least one cutting insert can be fixed;

the supporting ring is shrunk onto the base carrier;

the supporting ring is screwed together with the base carrier;

the base carrier is made of aluminum; and

the supporting ring is a steel ring.