EP0772502A1 - Process for producing conical gears and a device for carrying out said process - Google Patents
Process for producing conical gears and a device for carrying out said processInfo
- Publication number
- EP0772502A1 EP0772502A1 EP95927712A EP95927712A EP0772502A1 EP 0772502 A1 EP0772502 A1 EP 0772502A1 EP 95927712 A EP95927712 A EP 95927712A EP 95927712 A EP95927712 A EP 95927712A EP 0772502 A1 EP0772502 A1 EP 0772502A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- toothing
- stage
- transverse extrusion
- tool
- forming
- 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
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001125 extrusion Methods 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 239000002826 coolant Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 claims 1
- 238000003825 pressing Methods 0.000 claims 1
- 238000013022 venting Methods 0.000 claims 1
- 238000005242 forging Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/28—Making machine elements wheels; discs
- B21K1/30—Making machine elements wheels; discs with gear-teeth
Definitions
- the present invention relates to a method for producing bevel gearwheels with ready-to-install teeth. It also relates to a device for carrying out the method.
- the known manufacturing processes are limited in their productivity. Usual production rates for forging are about 20 workpieces per minute; in cold forming there are about twice as many.
- the object of the present invention is to provide a method for the production of bevel gears with ready-to-install toothing which allows a significantly higher production rate and thereby a reduction in the production costs for corresponding bevel gears.
- the tooth flank shape should have at least the same quality compared to known manufacturing processes.
- an essential feature of the present invention is thus that the toothing is shaped by transverse extrusion within a multi-stage forming process carried out in a vertically closing multi-stage press.
- the manufacturing rate can be increased significantly compared to known methods.
- the use of the vertically closing multi-stage press, which has not previously been used to form gears, is made possible in that the surface hardness of the dies is at least 50 Rockwell; depending on the geometry of the engraving hard metal dies or dies coated with hard metal or dies made of ceramic materials are used in particular.
- a further basic prerequisite is the cooling of the die engraving adapted to the die geometry to ensure a balanced temperature balance, and the attachment and design of die vents to improve the filling of the teeth with a reduction in the die internal pressure.
- the die life can be further increased in order to reduce the manufacturing costs of the bevel gearwheels by the transverse extrusion press tool used to form the toothing is designed to form a variable radius from tooth to heel of the toothing.
- the same result also contributes if the transverse extrusion die is designed to form one or more transition radii to the active tooth flank of the toothing.
- Another advantage, which results from the two features specified above, is an increase in the load-bearing capacity of the finished gear.
- the production rate can be increased further by the cross extrusion forming the toothing beginning before the tool halves are closed. It has turned out to be particularly favorable if the transverse extrusion to form the toothing begins after about 75% of the closing movement of the tool halves. With such a method, there is generally an optimal value from time saving on the one hand and manufacturing accuracy on the other.
- the transverse extrusion for shaping the toothing begins before the mold half is completely closed. Rather, the transverse extrusion for shaping the toothing can be initiated by a mandrel displacing the material even when the tool is completely closed.
- the inventive method can be in the range of normal forging temperature of 1000 ° - 1250 ° C, in the same manner ( ⁇ C 600 ° -950) be carried out at room temperature or in the semi-warm temperature range.
- the use of a vertically closing multi-stage press leads to a particularly wide range of possible sequences of Forming stages.
- the method according to the invention is thus characterized by a particularly high degree of flexibility and is suitable in this way for the production of bevel gears of the most varied designs.
- one or more preforming steps can be carried out after the blank has been sheared off and before the transverse extrusion to form the toothing.
- the workpiece can also be perforated before or after the transverse extrusion.
- the following sequence of steps is also possible: scissors-preforming-cup-perforating-cross extrusion.
- the number of deformation stages can be selected as a function of the required gear quality. With a corresponding number of deformation stages, for example, a tooth quality of at least 9 according to DIN 3965 can be achieved.
- the closing gap on the rear tool is expediently designed such that the horizontal force component in the punch caused by the spherical calotte shape is compensated.
- the stamp shape is designed so that the edge does not break away. In other words, the dimensioning of the stamp is matched to the horizontal forces caused by the spherical spherical shape.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4426180 | 1994-07-23 | ||
DE4426180A DE4426180A1 (en) | 1994-07-23 | 1994-07-23 | Method for producing bevel gears and device for carrying out the method |
PCT/EP1995/002914 WO1996003235A1 (en) | 1994-07-23 | 1995-07-24 | Process for producing conical gears and a device for carrying out said process |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0772502A1 true EP0772502A1 (en) | 1997-05-14 |
EP0772502B1 EP0772502B1 (en) | 1998-05-27 |
Family
ID=6524000
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95927712A Expired - Lifetime EP0772502B1 (en) | 1994-07-23 | 1995-07-24 | Process for producing conical gears and a device for carrying out said process |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0772502B1 (en) |
DE (2) | DE4426180A1 (en) |
WO (1) | WO1996003235A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10047467C5 (en) * | 2000-09-21 | 2009-08-06 | Schuler Pressen Gmbh & Co. Kg | Apparatus and method for forming, in particular with hydraulic closing device |
DE102005024908B4 (en) * | 2005-05-31 | 2017-11-09 | Volkswagen Ag | Method for producing a bevel gear |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2393628A (en) * | 1943-04-10 | 1946-01-29 | Timken Axle Co Detroit | Gear and method of making it |
US3675459A (en) * | 1971-02-03 | 1972-07-11 | Fritz Dohmann | Method for manufacturing bevel gears |
DE2219856B2 (en) * | 1972-04-22 | 1974-07-18 | Bayrisches Leichtmetallwerk Graf Bluecher Von Wahlstatt Kg, 8000 Muenchen | Process for the production of sintered forged workpieces forged in one operation |
-
1994
- 1994-07-23 DE DE4426180A patent/DE4426180A1/en not_active Withdrawn
-
1995
- 1995-07-24 EP EP95927712A patent/EP0772502B1/en not_active Expired - Lifetime
- 1995-07-24 DE DE59502358T patent/DE59502358D1/en not_active Expired - Lifetime
- 1995-07-24 WO PCT/EP1995/002914 patent/WO1996003235A1/en active IP Right Grant
Non-Patent Citations (3)
Title |
---|
560, XP 000411627 K\RNER 'Halbwarmfliesspressen kombiniert mit Kaltfliesspressen' * |
See also references of WO9603235A1 * |
WERKSTATT UND BETRIEB, Bd. 126, Nr. 9, September 1993 MUNCHEN DE, Seiten 557- * |
Also Published As
Publication number | Publication date |
---|---|
WO1996003235A1 (en) | 1996-02-08 |
DE4426180A1 (en) | 1996-01-25 |
DE59502358D1 (en) | 1998-07-02 |
EP0772502B1 (en) | 1998-05-27 |
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