EP1694452A1 - Verfahren zum herstellen eines zahnrades - Google Patents
Verfahren zum herstellen eines zahnradesInfo
- Publication number
- EP1694452A1 EP1694452A1 EP04802001A EP04802001A EP1694452A1 EP 1694452 A1 EP1694452 A1 EP 1694452A1 EP 04802001 A EP04802001 A EP 04802001A EP 04802001 A EP04802001 A EP 04802001A EP 1694452 A1 EP1694452 A1 EP 1694452A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal blank
- powder metal
- toothing
- pressure rings
- mandrel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 62
- 239000002184 metal Substances 0.000 claims abstract description 61
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 7
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 238000013459 approach Methods 0.000 claims description 4
- 238000005056 compaction Methods 0.000 abstract 1
- 239000002344 surface layer Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H5/00—Making gear wheels, racks, spline shafts or worms
- B21H5/02—Making gear wheels, racks, spline shafts or worms with cylindrical outline, e.g. by means of die rolls
- B21H5/022—Finishing gear teeth with cylindrical outline, e.g. burnishing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49462—Gear making
- Y10T29/49467—Gear shaping
- Y10T29/49471—Roll forming
Definitions
- the invention relates to a method for producing a gearwheel from a powder metal blank pressed and sintered with an oversize in the toothing area, the powder metal blank supported on a mandrel in the area of the oversize by pressing a counter toothing of a rotating presser tool engaging in the toothing of the powder metal blank plastic deformation around the allowance is compressed.
- the surface layer in the engagement area of the gearwheel is compacted by means of a pusher tool in the form of at least one gearwheel, which has either an external toothing (EP 0 552 B1) engaging in the toothing of the powder metal blank or an internal toothing (AT 406 836 B), with the aid of which the sliding speed can be reduced between the tooth flanks of the powder metal blank and the press tool.
- a pusher tool in the form of at least one gearwheel, which has either an external toothing (EP 0 552 B1) engaging in the toothing of the powder metal blank or an internal toothing (AT 406 836 B), with the aid of which the sliding speed can be reduced between the tooth flanks of the powder metal blank and the press tool.
- the invention is therefore based on the object of designing a method for producing a gearwheel of the type described at the outset in such a way that advantageous compression of the powder metal blank produced with an oversize in the toothing region can be ensured without having to fear an increase in the wheel circumference.
- the invention solves this problem in that the powder metal blank is clamped radially over the circumference at both end faces during its compression.
- the pushing forces which are otherwise locally limited to the area of engagement of the printing tool, are distributed over the circumference of the powder metal blank with the effect that an enlargement of the wheel circumference is prevented and the compression of the powder metal blank is essentially limited to the measuring range of Gearing limited.
- the powder metal blank can be axially clamped between two pressure rings in a simple manner, both non-positive and positive connections being possible. It is only a question of clamping the powder metal blank radially without hindering compression by the trigger tool in the toothing area.
- radial thrust forces can be exerted by the friction caused by the axial clamping of the powder metal blank between the pressure rings. finally be removed from the powder metal blank on the pressure rings.
- a corresponding transfer of force can, of course, also be achieved or supported by a form fit if this form fit allows a force transmission in the radial direction.
- a known device has a mandrel for supporting the powder metal blank of the gearwheel to be produced, which is pressed and sintered, and has at least one pusher tool which engages with a toothing in the toothing of the powder metal blank. If in such a device two pressure rings coaxial to the mandrel and the powder metal blank are axially clamped between them, the powder metal blank can be clamped radially over these circumferences between these axially pressed pressure rings in order to hold the part in the engagement area of the trigger tool due to the resulting receiving Powder metal blank between the pressing tool and the mandrel acting forces to prevent an enlargement of the wheel circumference without hindering the compression in the toothing area.
- one of the two pressure rings can be supported axially relative to the mandrel, while the other pressure ring is connected to an axial actuator.
- the required axial clamping forces can thus be exerted by the pressure rings on the powder metal blank via this actuator.
- the pressure rings and / or the powder metal blank can have axially projecting, circumferential approaches for the positive connection between the powder metal blank and the pressure rings. These circumferential approaches can engage in annular recesses or axially overlap corresponding shoulders in order to ensure a form-fit that is effective in the radial direction.
- the approaches or exceptions provided in the area of the powder metal blank Sections can be removed again after the gearing area has been compressed.
- FIG. 1 shows a device according to the invention for performing the method in a schematic side view
- FIG. 3 a representation corresponding to FIG. 2 of a construction variant of the radial clamping of the powder metal blank
- Fig. 4 shows another embodiment of a radial clamping of the powder metal blank also in a simplified axial section.
- the device according to FIG. 1 has a mandrel 1 for receiving a powder metal blank 2 to be machined and a pressure roller 5 which can be adjusted to a presser tool 4 via an actuator 3, for example a hydraulic cylinder.
- the pusher tool 4 consists of a ring gear with an internal toothing 6, which cooperates with the toothing 7 of the powder metal blank 2 as counter toothing.
- the teeth of the powder metal blank 2 were sintered with a corresponding allowance in the flank or foot area, but the teeth of the internal toothing 6 of the pusher tool 4 are designed according to the nominal size of the teeth of the gear to be manufactured, the tooth flanks or feet are in the area of Oversize compressed by the pressed teeth of the press tool 4 under a plastic deformation, the compression being carried out step by step because the powder metal blank is processed in several cycles. So that there is no plastic deformation of the entire gear cross-section due to the local application of force to the pressure tool 4, which is associated with an enlargement of the wheel circumference, the powder metal blank 2 is clamped radially on its two end faces over the circumference, which prevents the wheel circumference from being lengthened.
- the pusher forces which are otherwise local to the meshing area, can thus be distributed over the entire circumference of the wheel.
- the forces distributed over the circumference prevent the wheel body from being overloaded. Nevertheless, the necessary compression of the toothing in the area of the oversize is ensured, because the toothing lies outside the clamped area of the powder metal blank.
- two pressure rings 8, 9 are provided according to FIG. 2, between which the powder metal blank 2 is clamped axially.
- an actuator 10 which is designed in the exemplary embodiment as a nut 11, which is screw-adjustable in the axial direction on the mandrel 1 and presses the pressure ring 9 against the powder metal blank 2, which is supported on the pressure ring 8.
- the pressure ring 8 itself strikes a shoulder 12 of the dome 1 and is axially fixed by this shoulder 12. Since the pressure rings 8, 9 are pressed with their end faces on the end faces of the powder metal blank 2, there is a frictional engagement, via which radial thrust forces can be transferred from the powder metal blank 2 to the pressure rings 8, 9.
- the pusher forces that become effective in the area of the wheel body are thus not only distributed over the wheel circumference by the radial support of the powder metal blank 2, but are also partially transferred to the pressure rings 8 and 9.
- the positive connection between the powder metal blank 2 on the one hand and the pressure rings 8, 9 on the other hand is supplemented by a positive connection.
- the powder metal blank 2 forms axially projecting projections 13, which result in annular shoulders overlapped by the pressure rings 8, 9, so that a form-fitting conclusive support of the powder metal blank 2 on the pressure rings 8, 9.
- the radial clamping of the powder metal blank 2 can also only take place in a force-fitting manner if the connection between the powder metal blank 2 and the pressure rings 8, 9 takes place via circumferential radial projections 13 of the pressure rings 8, 9, which are in press in the end faces of the powder metal blank 2 and thus cause the desired positive locking in the radial direction.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
- Gears, Cams (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0205403A AT412955B (de) | 2003-12-19 | 2003-12-19 | Verfahren zum herstellen eines zahnrades |
PCT/AT2004/000436 WO2005058524A1 (de) | 2003-12-19 | 2004-12-13 | Verfahren zum herstellen eines zahnrades |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1694452A1 true EP1694452A1 (de) | 2006-08-30 |
EP1694452B1 EP1694452B1 (de) | 2010-09-01 |
Family
ID=34140250
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04802001A Active EP1694452B1 (de) | 2003-12-19 | 2004-12-13 | Verfahren zum herstellen eines zahnrades |
Country Status (7)
Country | Link |
---|---|
US (1) | US7334444B2 (de) |
EP (1) | EP1694452B1 (de) |
JP (1) | JP2007518567A (de) |
AT (1) | AT412955B (de) |
DE (1) | DE502004011620D1 (de) |
ES (1) | ES2351504T3 (de) |
WO (1) | WO2005058524A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014002219A1 (de) | 2014-02-21 | 2015-08-27 | Gkn Sinter Metals Engineering Gmbh | Verfahren und Vorrichtung zur Herstellung eines Zahnrades nebst Spannmittel |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT503037B1 (de) | 2006-05-04 | 2007-07-15 | Miba Sinter Austria Gmbh | Verfahren zum herstellen eines zahnrades |
JP5597159B2 (ja) | 2011-04-12 | 2014-10-01 | 住友重機械工業株式会社 | 歯車構造体の製造方法及び歯車構造体の中間構造体 |
JP7127296B2 (ja) | 2018-02-23 | 2022-08-30 | トヨタ自動車株式会社 | ギヤの製造方法及び製造装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59115120A (ja) | 1982-12-22 | 1984-07-03 | Komatsu Zoki Kk | ギヤのバニシング加工法 |
JPH0749132B2 (ja) | 1985-09-04 | 1995-05-31 | アイシン精機株式会社 | 歯車転造装置 |
GB2250227B (en) * | 1990-10-08 | 1994-06-08 | Formflo Ltd | Gear wheels rolled from powder metal blanks |
US5659955A (en) * | 1994-01-21 | 1997-08-26 | Plamper; Gerhard | Method of making powder metal helical gears |
JP3298765B2 (ja) * | 1995-09-06 | 2002-07-08 | トヨタ自動車株式会社 | 高精度歯車転造方法 |
AT406836B (de) * | 1997-10-30 | 2000-09-25 | Miba Sintermetall Ag | Verfahren und vorrichtung zum herstellen eines zahnrades |
-
2003
- 2003-12-19 AT AT0205403A patent/AT412955B/de not_active IP Right Cessation
-
2004
- 2004-12-13 JP JP2006548028A patent/JP2007518567A/ja active Pending
- 2004-12-13 ES ES04802001T patent/ES2351504T3/es active Active
- 2004-12-13 WO PCT/AT2004/000436 patent/WO2005058524A1/de not_active Application Discontinuation
- 2004-12-13 DE DE502004011620T patent/DE502004011620D1/de active Active
- 2004-12-13 EP EP04802001A patent/EP1694452B1/de active Active
- 2004-12-13 US US10/582,732 patent/US7334444B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2005058524A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014002219A1 (de) | 2014-02-21 | 2015-08-27 | Gkn Sinter Metals Engineering Gmbh | Verfahren und Vorrichtung zur Herstellung eines Zahnrades nebst Spannmittel |
Also Published As
Publication number | Publication date |
---|---|
JP2007518567A (ja) | 2007-07-12 |
ES2351504T3 (es) | 2011-02-07 |
DE502004011620D1 (de) | 2010-10-14 |
WO2005058524A1 (de) | 2005-06-30 |
US20070107481A1 (en) | 2007-05-17 |
AT412955B (de) | 2005-09-26 |
EP1694452B1 (de) | 2010-09-01 |
ATA20542003A (de) | 2005-02-15 |
US7334444B2 (en) | 2008-02-26 |
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