WO2020178693A1 - Umfangsfräswerkzeug sowie verfahren zum anordnen von schneidkanten - Google Patents
Umfangsfräswerkzeug sowie verfahren zum anordnen von schneidkanten Download PDFInfo
- Publication number
- WO2020178693A1 WO2020178693A1 PCT/IB2020/051722 IB2020051722W WO2020178693A1 WO 2020178693 A1 WO2020178693 A1 WO 2020178693A1 IB 2020051722 W IB2020051722 W IB 2020051722W WO 2020178693 A1 WO2020178693 A1 WO 2020178693A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cutting edges
- cutting
- milling tool
- cutting edge
- chip thickness
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/08—Disc-type cutters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/12—Cutters specially designed for producing particular profiles
- B23C5/14—Cutters specially designed for producing particular profiles essentially comprising curves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/16—Milling-cutters characterised by physical features other than shape
- B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/08—Side or top views of the cutting edge
- B23C2210/084—Curved cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/28—Arrangement of teeth
- B23C2210/285—Cutting edges arranged at different diameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/28—Arrangement of teeth
- B23C2210/287—Cutting edges arranged at different axial positions or having different lengths in the axial direction
Definitions
- the invention relates to a circumferential milling tool for metal cutting, with a milling tool body rotatable about a tool axis, on which at least two cutting edge groups are arranged, the cutting edges of a first cutting edge group being arranged on a circular path with a first diameter running around the tool axis and the cutting edges of a second cutting edge group on a circular path running around the tool axis with a second diameter.
- the invention also relates to a method for arranging cutting edges on a circumferential milling tool rotatable about a tool axis.
- Circumferential milling tools with two or more cutting edge groups are known from the prior art.
- the cutting edges are arranged by means of an aforementioned method.
- the arrangement of the cutting edge groups has an effect on the one hand on the milling process implemented by means of the associated cutting edges and on the other hand on the load on the peripheral milling tool.
- the arrangement of the cutting edge groups should be selected in such a way that a high metal removal rate can be achieved, that is, the milling process runs efficiently. At the same time, a high surface quality of the machined surfaces should be guaranteed.
- the service life of the individual cutting edges should also be long.
- the circumferential milling tool should be loaded as little as possible and, in particular, evenly. There are obviously several tradeoffs here.
- the object of the invention is therefore to specify a circumferential milling tool in which the aforementioned conflicting goals are resolved or at least in terms of their intensity are greatly reduced.
- economical component machining should be ensured by means of a circumferential milling tool to be specified.
- the object is achieved by a circumferential milling tool of the type mentioned at the outset, in which the cutting edges of the first cutting edge group are arranged at a first setting angle and the cutting edges of the first cutting edge group are assigned a first center chip thickness for a given first tooth feed and a given first cutting width and the cutting edges of the second cutting edge group are arranged at a second setting angle on the milling tool body in such a way that they are assigned a second tooth feed and a second cutting width resulting from the predetermined first tooth feed and the predetermined first cutting width, which result in a second mean chip thickness that is assigned to the cutting edges of the second cutting edge group , wherein the first mean chip thickness and the second mean chip thickness are essentially the same size.
- a feed is understood to be a feed path per milling cutter revolution.
- a tooth feed (f z ) is therefore the feed path per tooth or cutting edge.
- the cutting width (A e ) is also referred to as the working width. It denotes the width over which the peripheral milling tool engages a workpiece. It is always measured in the working plane, the working plane being determined by the feed direction and the cutting direction.
- the specified tooth feed and the specified cutting width (usually abbreviated as A p ) are arbitrary.
- the setting angle (K) which is also referred to as the tool setting angle, is understood to mean the angle between the working plane and the tool cutting edge plane. It therefore determines the position of the main cutting edge in relation to the workpiece. It is known that the chip thickness changes during the cutting action of a peripheral milling tool.
- the mean chip thickness can be specified using the following formula, where d is the tool diameter.
- An exemplary approximation formula is the following:
- the tooth feed (f z ), i.e. the feed path per tooth, is calculated using the following formula, where f is the feed per revolution and Z eff is the effective number of teeth:
- a changed tooth feed rate can thus result from a change in one of the input variables of the above formula, in particular the effective number of teeth.
- the first diameter of the circular path on which the cutting edges of the first cutting edge group are arranged and the second diameter of the circular path on which the cutting edges of the second cutting edge group are arranged can be the same or different.
- the basic idea of the present invention is to view the average chip thickness as a measure of the load on the individual cutting edges and to design the peripheral milling tool in such a way that the same or approximately the same average chip thickness is present across all cutting edge groups. The point is therefore to load all cutting edges essentially equally. If this basic concept is based on a circumferential milling tool with only one cutting edge group, then the cutting edges of the second cutting edge group can also be viewed as relief cutting edges for the first cutting edge group. In the present case, each cutting edge group going beyond a first cutting edge group is to be understood as a second cutting edge group.
- different mean chip thicknesses can arise, for example, through different setting angles of a cutting edge with, for example, a round cutting edge course.
- mean chip thicknesses when different cutting edges are arranged with different setting angles. This can also occur when different groups of cutting edges are arranged on different diameters. This provokes a different cutting width.
- a different cutting width can also result from an uneven oversize situation on the workpiece to be machined.
- a different tooth feed which in turn influences the average chip thickness, can also result from a different effective number of teeth. All these effects, which are usually perceived as disturbing, are used within the scope of the present invention in order to set the same average chip thickness as possible across all cutting edge groups on the circumferential milling tool.
- the cutting edges of the first cutting edge group are preferably offset with respect to the cutting edges of the second cutting edge group along the tool axis.
- the individual cutting edge groups are therefore offset in the axial direction.
- cutting edges of a third group of cutting edges are provided, which are arranged on a circular path with a third diameter running around the tool axis, and which are arranged at a third setting angle on the milling tool body in such a way that they result from the predetermined first tooth feed and the predetermined first cutting width a third tooth feed and a third cutting width are assigned, which result in a third average chip thickness, which is assigned to the cutting edges of the third cutting edge group, the third average chip thickness being substantially equal to the first average chip thickness and / or the second average chip thickness.
- a circumferential milling tool is generated in accordance with the above statements, which is essentially evenly loaded during the milling process.
- the third diameter can be the same or different than the first and / or second diameter.
- the cutting edges are preferably cutting edges of cutting inserts arranged on the milling tool body, in particular of indexable cutting inserts.
- the cutting edges can be exchanged in a simple manner if, for example, they are no longer usable due to wear.
- Such circumferential milling tools can be used particularly economically.
- the first central chip thickness and / or the second central chip thickness and / or the third central chip thickness differ by a maximum of 10%, preferably a maximum of 5%, more preferably a maximum of 2%.
- a maximum of 10% preferably a maximum of 10%, more preferably a maximum of 5%, more preferably a maximum of 2% larger or smaller than the other.
- the resulting mean chip thicknesses are therefore essentially the same.
- the peripheral milling tool can be a disk milling cutter, a slot milling cutter, a profile milling cutter, a shoulder milling cutter or a face milling cutter.
- a profile milling cutter can, for example, be designed to produce so-called fir tree grooves.
- circumferential milling tool The concept of a circumferential milling tool is therefore to be understood broadly. It is understood to mean all milling tools in which a tool circumference, which is determined relative to the tool axis, is involved in a milling operation. Of the The term scope therefore refers to the tool and not to the workpiece to be machined.
- the cutting edges of the first cutting edge group and / or the second cutting edge group and / or the third cutting edge group are arcuate, in particular arcuate. This can be realized in particular by round or partially round indexable inserts.
- the setting angles of the cutting edges of different groups of cutting edges can also be different. As has already been explained, different setting angles represent a simple way of matching the mean chip thicknesses of the cutting edge groups to one another.
- the setting angles of the arcuate cutting edges of different cutting edge groups can adjoin one another without or with an overlap.
- the cutting edges of a first cutting edge group can have a setting angle of 90 ° to 30 °. This can be achieved, for example, by means of round cutting edges or cutting edges that are round in sections.
- the cutting edges of a second cutting edge group can have a setting angle of 45 ° to 0 °.
- the cutting edges of the second cutting edge group are also round, for example.
- the different groups of cutting edges advantageously comprise different numbers of cutting edges.
- the number of cutting edges can be used, for example, to influence the tooth feed and thus vary the average chip thickness. In this way, the
- Mean chip thicknesses of different cutting edge groups are adjusted to one another.
- the cutting edges of at least one, preferably all of the cutting edge groups are preferably arranged uniformly around the circumference. This means that there is an identical circumferential distance between the cutting edges of a cutting group. This way becomes a
- Circumferential milling tool created that is particularly evenly loaded when it is in a milling operation.
- the object is also achieved by a method of the type mentioned at the beginning, which comprises the following steps:
- a circumferential milling tool can be created that is particularly uniformly loaded during operation.
- the advantages and effects already explained for the peripheral milling tool according to the invention can thereby be achieved.
- the target conflicts mentioned at the beginning are resolved or at least mitigated.
- the method can be used for peripheral milling tools in which the first diameter and the second diameter are the same or different.
- the method is of course not limited to two groups of cutting edges. For each further cutting edge group, for example for a third cutting edge group, the procedure is analogous to step b).
- the first mean chip thickness and the second mean chip thickness are selected such that they differ by a maximum of 10%, preferably a maximum of 5%, more preferably a maximum of 2%. A circumferential milling tool that is essentially uniformly loaded is thus produced.
- the cutting edges of at least one, preferably all of the cutting edge groups are advantageously arranged circumferentially uniformly. This results in a uniform load on the peripheral milling tool.
- Figure 2 shows the peripheral milling tool from Figure 1 in a plan view
- FIG. 3 shows the circumferential milling tool from FIG. 2 in a sectional view along the line III-III
- FIG. 4 shows a detail IV of the circumferential milling tool from FIG. 3, with a fir tree groove produced by means of the circumferential milling tool also being shown schematically,
- FIG. 7 shows a top view of a circumferential milling tool according to the invention according to a second embodiment, the cutting edges of which are arranged by means of a method according to the invention
- FIG. 8 is a broken sectional view along the line VIII-VIII of the peripheral milling tool from Figure 7, - Figure 9 shows a detail IX of the peripheral milling tool from Figure 8,
- FIG. 10 shows a side view of a circumferential milling tool according to the invention according to a third embodiment, the cutting edges of which are arranged by means of a method according to the invention, and
- FIG. 11 shows an example of a workpiece contour produced by means of the circumferential milling tool from FIG. 10, an associated initial contour also being shown.
- Figures 1 to 6 show a peripheral milling tool 10, which is designed as a disk milling cutter. This is intended to produce grooves, in particular so-called Christmas tree grooves 1 1 (see FIG. 4).
- the circumferential milling tool 10 comprises a milling tool body 14 rotatable about a tool axis 12.
- the cutting edges of all six groups of cutting edges are formed by indexable inserts arranged on the milling tool body 14.
- a first cutting edge group comprises the cutting edges 16, each of which has a circular shape.
- the cutting edges 16 can be referred to as main cutting edges.
- a second cutting edge group is formed by the cutting edges 18. These also have a circular shape.
- the cutting edges 18 can also be referred to as main cutting edges.
- the cutting edges 16 of the first cutting edge group and the cutting edges 18 of the second cutting edge group are each arranged on a circular path with the same diameters. However, the cutting edges 16 of the first cutting edge group are offset in the axial direction with respect to the cutting edges 18 of the second cutting edge group.
- a third group of cutting edges is provided which comprises the cutting edges 20. These are circular.
- the cutting edges 20 can be used as Relief cutting edges are referred to, in which case they relieve the cutting edges 16 in particular.
- a fourth group of cutting edges is provided which comprises the cutting edges 22. These are also circular.
- the cutting edges 22 of the fourth group of cutting edges can be referred to as relief cutting edges. In particular, they relieve the cutting edges 18.
- the cutting edges 20, 22 of the third and fourth groups of cutting edges are arranged on a slightly smaller diameter.
- the diameters of the third and fourth groups of cutting edges are the same.
- the setting angle k of the cutting edges 22 begins at 45 ° and runs down to 0 °.
- the setting angles k of the cutting edges 18 and 22 are therefore different and adjoin one another with an overlap.
- the overlap area ranges from 30 ° to 45 °. The same applies to the cutting edges 16 in relation to the cutting edges 20.
- a fifth group of cutting edges with cutting edges 24 and a sixth group of cutting edges with cutting edges 26 are also provided.
- the cutting edges 24 and 26 are provided by indexable inserts with an essentially rectangular shape.
- the table below shows the mean chip thicknesses h m achieved with the first to sixth cutting edge groups. The calculation is carried out using the diameter d assigned to the respective cutting edge group, the number of teeth Z, the setting angle K, the Cutting width A e and the tooth feed f z . The aforementioned formula is used.
- the individual cutting edges 16, 18, 20, 22, 24, 26 are arranged essentially uniformly on the circumference of the milling tool body 14 (see FIGS. 1 and 2). With the circumferential milling tool 10 according to the first embodiment, an angular distance of 15 ° between adjacent cutting edges 16, 18, 20, 22, 24, 26 is always maintained, regardless of whether it belongs to one of the cutting edge groups. The total of 24 cutting edges 16, 18, 20, 22, 24, 26 are therefore evenly distributed on the circumference of the milling tool body 14. Alternatively, 36 cutting edge stations can also be provided. With a total of 36 cutting edge stations, a so-called 9 division can start at 0 °, 10 ° and 20 °. So, starting from a 0 ° position, nine cutting edge stations are arranged uniformly on the circumference of the milling tool body 14.
- a 9 division can start at 0 ° and 20 ° and a 6 division each at 10 °, 30 ° and 50 °.
- divisions of 6 can start at 0 °, 20 °, 30 ° and 50 ° and divisions of 4 at 10 °, 10 ° and 70 °.
- a 5 division can start at 0 ° and 36 ° and a 2 division can start at 18 °, 54 °, 90 °, 126 ° and 162 °.
- the table also shows that the specified mean chip thicknesses h m of the individual cutting edge groups are essentially the same.
- FIGS. 7 to 9 Another, second embodiment of the peripheral milling tool 10 is shown in FIGS. 7 to 9. This embodiment again differs from the two aforementioned embodiments only in the values given in the table below. For the rest, reference is made to the explanations above.
- FIGS. 10 and 11 A third embodiment is shown in FIGS. 10 and 11.
- the peripheral milling tool 10 is designed as a face milling cutter. It only includes three groups of cutting edges. These are again formed from indexable inserts, the cutting edges being denoted by the reference numerals 16, 18, 20 of the cutting edges of the first three groups of cutting edges from the aforementioned exemplary embodiments.
- the diameters on which the cutting edges 16, 18, 20 belonging to the various cutting edge groups are arranged are now the same.
- the cutting edges 16, 18, 20 and the indexable inserts of the individual cutting edge groups carrying them are only offset from one another along the tool axis 12.
- peripheral milling tool 10 The precise characteristics of the peripheral milling tool 10 according to the third embodiment are shown in the table below:
- the cutting edges are by means of a method for arranging cutting edges 16, 18, 20, 22, 24, 26 on one by one Tool axis 12 rotatable circumferential milling tool 10 is arranged.
- the procedure is as follows:
- the cutting edges 16 of the first cutting edge group are arranged on a circular path running around the tool axis 12 with a first diameter di.
- the cutting edges 16 are each positioned with a first setting angle KI so that a first cutting width A e ⁇ and a first tooth feed f zi of the cutting edges 16 of the first cutting edge group are set at a given speed of the peripheral milling tool 10 and a given feed rate of the same. This results in a first average chip thickness h mi , which is assigned to the cutting edges 16 of the first cutting edge group.
- a second group of cutting edges is then arranged on a circular path running around the tool axis 12 with a second diameter d2.
- each cutting edge group additional to the first cutting edge group is referred to as a second cutting edge group.
- the second diameter d2 can be the same as or different from the first diameter di.
- the cutting edges 18, 20, 22, 24, 26 belonging to the second cutting edge group are each arranged at a second setting angle K2.
- the second diameter d2 and / or the second setting angle K2 are selected in such a way that at the specified speed of the peripheral milling tool 10 and the specified feed rate of the same, a second cutting width A e 2 and a second tooth feed f Z 2 for the cutting edges 18, 20, 22, 24, 26 of the second cutting edge group.
- the number of cutting edges 16, 18, 20, 22, 24, 26 of a cutting edge group can also be varied.
- the second mean chip thickness h m 2 is set via the mentioned influencing factors in such a way that it is essentially equal to the first average chip thickness h mi .
- first mean chip thickness h mi and the second mean chip thickness h m 2 differ from one another by a maximum of 10%, preferably a maximum of 5%, more preferably a maximum of 2%.
- the cutting edges 16, 18, 20, 22, 24, 26 of the individual cutting edge groups are preferably arranged uniformly on the circumference.
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- Mechanical Engineering (AREA)
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/436,850 US20220176470A1 (en) | 2019-03-07 | 2020-02-28 | Peripheral milling tool and method for arranging cutting edges |
EP20765645.5A EP3934837A4 (de) | 2019-03-07 | 2020-02-28 | Umfangsfräswerkzeug sowie verfahren zum anordnen von schneidkanten |
CN202080018626.9A CN113543914A (zh) | 2019-03-07 | 2020-02-28 | 圆周铣削工具和布置切削刃的方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102019105858.9 | 2019-03-07 | ||
DE102019105858.9A DE102019105858A1 (de) | 2019-03-07 | 2019-03-07 | Umfangsfräswerkzeug sowie Verfahren zum Anordnen von Schneidkanten |
Publications (1)
Publication Number | Publication Date |
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WO2020178693A1 true WO2020178693A1 (de) | 2020-09-10 |
Family
ID=72146536
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/IB2020/051722 WO2020178693A1 (de) | 2019-03-07 | 2020-02-28 | Umfangsfräswerkzeug sowie verfahren zum anordnen von schneidkanten |
Country Status (5)
Country | Link |
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US (1) | US20220176470A1 (de) |
EP (1) | EP3934837A4 (de) |
CN (1) | CN113543914A (de) |
DE (1) | DE102019105858A1 (de) |
WO (1) | WO2020178693A1 (de) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5931616A (en) * | 1996-03-22 | 1999-08-03 | Walter Ag | Method and apparatus for producing undercut grooves |
JP2002361511A (ja) | 2001-06-11 | 2002-12-18 | Honda Motor Co Ltd | 切削工具の切刃配列方法 |
JP2004223630A (ja) * | 2003-01-21 | 2004-08-12 | Toshiba Tungaloy Co Ltd | 正面フライス |
US20110150583A1 (en) | 2009-12-18 | 2011-06-23 | Sandvik Intellectual Property Ab | Device for milling of materials |
US8821080B2 (en) * | 2003-10-15 | 2014-09-02 | Kennametal Inc. | Cutting insert for high feed face milling |
JP2015196203A (ja) | 2014-03-31 | 2015-11-09 | 三菱マテリアル株式会社 | 刃先交換式メタルソー |
DE102016104005A1 (de) | 2016-03-04 | 2017-09-07 | Gottfried Wilhelm Leibniz Universität Hannover | Fräswerkzeug |
DE202018003189U1 (de) | 2018-07-09 | 2018-09-04 | Ali Namazi | Seitliche bzw. radiale Korrektur der Schneiden bei allen rotierenden mehrzahnigen spanabnehmenden Schneidwerkzeugen mit ungleichmäßig angeordneten Schneiden (Fräswerkzeuge, Kreissägeblätter) |
-
2019
- 2019-03-07 DE DE102019105858.9A patent/DE102019105858A1/de active Pending
-
2020
- 2020-02-28 US US17/436,850 patent/US20220176470A1/en active Pending
- 2020-02-28 WO PCT/IB2020/051722 patent/WO2020178693A1/de active Application Filing
- 2020-02-28 CN CN202080018626.9A patent/CN113543914A/zh active Pending
- 2020-02-28 EP EP20765645.5A patent/EP3934837A4/de active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5931616A (en) * | 1996-03-22 | 1999-08-03 | Walter Ag | Method and apparatus for producing undercut grooves |
JP2002361511A (ja) | 2001-06-11 | 2002-12-18 | Honda Motor Co Ltd | 切削工具の切刃配列方法 |
JP2004223630A (ja) * | 2003-01-21 | 2004-08-12 | Toshiba Tungaloy Co Ltd | 正面フライス |
US8821080B2 (en) * | 2003-10-15 | 2014-09-02 | Kennametal Inc. | Cutting insert for high feed face milling |
US20110150583A1 (en) | 2009-12-18 | 2011-06-23 | Sandvik Intellectual Property Ab | Device for milling of materials |
JP2015196203A (ja) | 2014-03-31 | 2015-11-09 | 三菱マテリアル株式会社 | 刃先交換式メタルソー |
DE102016104005A1 (de) | 2016-03-04 | 2017-09-07 | Gottfried Wilhelm Leibniz Universität Hannover | Fräswerkzeug |
DE202018003189U1 (de) | 2018-07-09 | 2018-09-04 | Ali Namazi | Seitliche bzw. radiale Korrektur der Schneiden bei allen rotierenden mehrzahnigen spanabnehmenden Schneidwerkzeugen mit ungleichmäßig angeordneten Schneiden (Fräswerkzeuge, Kreissägeblätter) |
Non-Patent Citations (1)
Title |
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See also references of EP3934837A4 |
Also Published As
Publication number | Publication date |
---|---|
CN113543914A (zh) | 2021-10-22 |
DE102019105858A1 (de) | 2020-09-10 |
EP3934837A4 (de) | 2022-11-30 |
EP3934837A1 (de) | 2022-01-12 |
US20220176470A1 (en) | 2022-06-09 |
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