EP0904176A1 - Method and device for non-circular grinding of cam shapes with concave flanks - Google Patents
Method and device for non-circular grinding of cam shapes with concave flanksInfo
- Publication number
- EP0904176A1 EP0904176A1 EP97923019A EP97923019A EP0904176A1 EP 0904176 A1 EP0904176 A1 EP 0904176A1 EP 97923019 A EP97923019 A EP 97923019A EP 97923019 A EP97923019 A EP 97923019A EP 0904176 A1 EP0904176 A1 EP 0904176A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding
- grinding wheel
- axis
- camshaft
- angle
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
- B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
- B24B19/12—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or camshafts
Definitions
- the invention relates to a method with the features specified in the preamble of claim 1 and a device with the features specified in the preamble of claim 8.
- the grinding spindle is oriented perpendicular to the camshaft axis.
- the concave part of the cam is excavated with a separate disc. This results in a shape error in the transition area to the concave cam section because the cam shape is not finished with a grinding wheel over its entire circumference
- Cam specifies the maximum diameter of the swashplate due to its maximum umlaut diameter.
- a process or oscillation of the grinding wheel in the direction of the longitudinal axis of the camshaft must be used, which is time-consuming and uneconomical.
- cams are ground using a belt grinding method.
- the grinding belts often have to be exchanged and the cam running surface can only be ground.
- the fact that the grinding belt is changed frequently means that this system is compared to the Grinding with ceramic bound CBN is uneconomical
- the entire grinding unit must be swiveled to grind inclined cams.
- the accuracy values cannot be achieved as with grinding
- the invention is based on the object of developing a method or a device of the type presupposed as known in such a way that the disadvantages described above are avoided and that, in particular with high accuracy of the finished camshaft, it is possible to work with a very short and accordingly rigid grinding spindle design .
- the inclined position of the grinding spindle means that it is possible to work with a small grinding wheel diameter and yet a very short and stiff grinding spindle.
- the accuracy of the finished camshaft results from the coordination of the movements of the grinding spindle in relation to three different CNC axes. Due to the inclined position of the grinding spindle, the situation in the machine is greatly simplified due to the interference edges. This makes it e.g. It is also possible to grind concave cam shapes with a small concave radius on long camshafts.
- the system is also much more flexible than would be the case with a grinding spindle for the small grinding wheel arranged parallel to the camshaft center axis.
- Figure 1 is a plan view of a device designed according to the invention.
- IA shows a partial section of the device shown in Fig. 1.
- Figure 2 shows a section through the camshaft and grinding wheel along the section line S - S in Fig. 1.
- FIG. 3 shows the front view of the device shown in FIG. 1 in the direction of arrow V;
- Fig. 4 is a plan view of a modified device, in which it works with its own pre-grinding wheel.
- Fig. 1 it is shown that the sliding spindle 1 for grinding cams with a cam surface 17 parallel to the longitudinal axis 2 of the camshaft is arranged at an angle a to the longitudinal axis 2 of the camshaft.
- the grinding wheel 3 is tapered at the same angle, so that the grinding zone 4 of the grinding wheel 3 is again arranged parallel to the Nockenwellen ⁇ slow axis 2.
- the oblique arrangement of the lead screw 1 ensures that it can be made much shorter and stiffer than if it were arranged parallel to the longitudinal axis 2 of the camshaft.
- the angle ⁇ is freely selectable and preferably has a value between 10 ° and 30 °, the angle size depending on the camshaft geometry.
- the camshaft 13 is received between a workpiece headstock 9, on which a chuck 10 is mounted, which is rotatably mounted about its longitudinal axis in the extension of the workpiece axis of rotation 2, and a tailstock 11.
- the workpiece headstock 9 and the tailstock 1 1 are firmly mounted on the grinding table 12.
- 12 steadies 5 and 7 are mounted on the grinding table, which prevent the camshaft 13 from bending during the grinding process.
- the steadies 5 and 7 support the camshaft 13 at their bearings 6 and 8, respectively, in exact alignment between the longitudinal axis of the workpiece spindle stock 9 and the tailstock 11.
- the grinding spindle drive for the grinding spindle 1 with the small grinding wheel 3 can be designed with a belt drive or as a high-frequency grinding spindle unit.
- the infeed axis X and the longitudinal positioning axis Z are shown in FIG. 1.
- the vertical feed axis Y has to be thought perpendicular to the drawing plane.
- the workpiece rotates around the workpiece axis of rotation C. With a small grinding allowance, the cam contour can only be produced with the grinding wheel 3. However, it is also possible for a separate grinding wheel of larger diameter to be used for rough grinding.
- FIG. 1A A partial section from FIG. 1 is shown in FIG. 1A.
- grinding conical cams which have a helix angle ⁇ on the cam surface 17 in the direction of the longitudinal axis 2 of the camshaft.
- the grinding zone 4 migrates during cam shape grinding due to the non-circular contour of the cam 15 above or below the theoretical longitudinal axis 2 of the camshaft, so that the grinding zone on the grinding wheel moves between points 4A and 4B during a cam revolution. If the grinding wheel were inclined, this would normally lead to a distortion of the cam surface 17.
- the grinding wheel 3 with the entire grinding spindle 1 along the vertical feed axis Y such that the grinding is always carried out exactly in the grinding zone 4 shown in FIG. 2.
- the shooting zone 4 must lie on the sander disk circumference on the grinding disk 3 on the center line 20, which in turn is arranged parallel to the X axis
- This night watch of the grinding wheel 3 during the cam shape grinding is shown in FIG. 2 by the two dimensions A and B.
- All axes are designed as CNC axes.
- the feed axis Y serves to keep the grinding zone 4 on the grinding wheel 3 always in the same position.
- the infeed axis X and the workpiece axis of rotation C serve to generate the cam shape and must therefore work in coordinated operation.
- the vertical feed axis Y In order to always keep the shooting zone 4 in the same position on the grinding wheel 3, the vertical feed axis Y must be tracked as a function of the position of the feed axis X and the workpiece rotation axis C. It can be seen that the three axes X, Y and C must work in a direct relationship to one another and are therefore operated in a coordinated manner In the case of camshafts which have a larger slip allowance, the embodiment according to FIG. 4 can be used, for example.
- the first grinding spindle la need not be arranged to be movable in the direction of the Y axis.
- the second swiveling lead screw 1 which is used for finish grinding the cam contour and receives at least one grinding wheel 3, has the structure shown in FIGS. 1 to 3.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19620813A DE19620813C2 (en) | 1996-05-23 | 1996-05-23 | Method and device for non-circular grinding of cam shapes with concave flanks |
DE19620813 | 1996-05-23 | ||
PCT/EP1997/002356 WO1997044159A1 (en) | 1996-05-23 | 1997-05-07 | Method and device for non-circular grinding of cam shapes with concave flanks |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0904176A1 true EP0904176A1 (en) | 1999-03-31 |
EP0904176B1 EP0904176B1 (en) | 2001-11-21 |
Family
ID=7795141
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97923019A Expired - Lifetime EP0904176B1 (en) | 1996-05-23 | 1997-05-07 | Method and device for non-circular grinding of cam shapes with concave flanks |
Country Status (9)
Country | Link |
---|---|
US (1) | US6200200B1 (en) |
EP (1) | EP0904176B1 (en) |
JP (1) | JP2000510771A (en) |
KR (1) | KR20000015927A (en) |
BR (1) | BR9709022A (en) |
CA (1) | CA2256430A1 (en) |
DE (2) | DE19620813C2 (en) |
GE (1) | GEP20012496B (en) |
WO (1) | WO1997044159A1 (en) |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2114778B1 (en) * | 1994-10-18 | 1999-01-16 | Danobat | IMPROVEMENTS IN HIGH SPEED GRINDERS FOR REACTION MOTOR ROTOR WINGS AND THE LIKE. |
US6390907B1 (en) * | 1998-02-09 | 2002-05-21 | Joel Kym Metzler | Machine tool and machine tool spindle and workpiece mounting-apparatus and grinding process |
DE19813165A1 (en) | 1998-03-25 | 1999-10-07 | Kopp Werkzeugmasch Gmbh | Method and device for machining non-circular inner and outer contours |
GB2361445A (en) * | 1999-02-03 | 2001-10-24 | Unova Uk Ltd | Angle head grinding |
DE19921785B4 (en) * | 1999-05-11 | 2005-11-24 | Erwin Junker Maschinenfabrik Gmbh | Method for grinding convex running surfaces and outer diameters on shafts with at least one disk-shaped shaft section and grinding machine for carrying out the method |
US6648727B1 (en) * | 1999-09-14 | 2003-11-18 | R. Warren Aldridge, Jr. | CNC dual workhead chucker grinder |
ES2239620T3 (en) * | 1999-10-27 | 2005-10-01 | Unova U.K. Limited | RECTIFIED METHOD OF PARTS THAT ALLOWS A CONSTANT DISPOSAL SPEED. |
GB2365806B (en) * | 2000-06-21 | 2003-11-19 | Unova Uk Ltd | Grinding machine |
US20030186631A1 (en) * | 2002-03-29 | 2003-10-02 | Toyoda Koki Kabushiki Kaisha | Cylindrical grinder, and mechanism for producing relative movement between grinding wheel and workpiece in cylindrical grinder |
JP4140574B2 (en) | 2004-07-28 | 2008-08-27 | 株式会社ジェイテクト | Method and apparatus for grinding a cam having a concave surface |
DE102005021788B4 (en) * | 2005-05-11 | 2006-12-28 | Krüger, Hermann, Prof. Dr.-Ing. | Method and device for producing a three-dimensional cam and three-dimensional cams, in particular for the variable actuation of lift valves in internal combustion engines |
DE102007032954B3 (en) * | 2007-07-14 | 2008-12-18 | Krüger, Hermann, Prof. Dr.-Ing. | Production of a three-dimensional cam for driving a cam follower comprises crossing the rotational axis of the cam in a single crossing angle during formation of a base circle cylinder section without cutting the rotational axis of the cam |
DE102008019242B4 (en) * | 2008-04-17 | 2020-06-04 | Audi Ag | Valve train for gas exchange valves of an internal combustion engine |
EP2163341B1 (en) | 2008-09-12 | 2019-07-10 | Jtekt Corporation | Machine tool with rest apparatus and machining method thereof |
JP5428260B2 (en) * | 2008-09-12 | 2014-02-26 | 株式会社ジェイテクト | Machine tool with provisional cradle |
DE502008001096D1 (en) * | 2008-11-05 | 2010-09-16 | Supfina Grieshaber Gmbh & Co | Finishing machine with a stone turning unit |
DE102008061271A1 (en) | 2008-12-10 | 2010-06-24 | Emag Holding Gmbh | Grinding wheel for grinding cam lobe of camshaft, and for use in grinding machine, has processing surface in circumferential direction of different diameters, where processing surface has concave partial surface and convex partial surface |
KR101104438B1 (en) * | 2009-07-21 | 2012-01-12 | 김민웅 | Polishing device for electric knife |
JP5428740B2 (en) * | 2009-10-19 | 2014-02-26 | 株式会社ジェイテクト | Compound grinding machine |
ES2368242B1 (en) * | 2010-04-27 | 2012-09-17 | Danobat, S. Coop. | DEVICE FOR RECTIFYING ROTOR DISK BLADES AND METHOD FOR CARRYING OUT RECTIFIED SUCH. |
CN102452030B (en) * | 2010-10-27 | 2016-07-06 | 株式会社捷太格特 | Method for grinding, grinding system and Multi-function grinding lathe |
GB2491020B (en) * | 2012-05-15 | 2013-03-27 | Cinetic Landis Ltd | Machine tool with central support between machine axes |
US8801503B2 (en) * | 2012-06-19 | 2014-08-12 | Gleason Cutting Tools Corporation | Grinding machine with multi-spindle grinding head |
JP6287044B2 (en) * | 2013-10-17 | 2018-03-07 | 株式会社ジェイテクト | Method and apparatus for grinding roller material |
US9498865B2 (en) * | 2013-12-27 | 2016-11-22 | United Technologies Corporation | System and methods for rough grinding |
JP6645145B2 (en) * | 2015-12-02 | 2020-02-12 | 株式会社ジェイテクト | Cam grinding device and cam grinding method |
CN110405551B (en) * | 2019-07-20 | 2023-02-28 | 宁波兴马油嘴油泵有限公司 | Needle valve cylindrical grinding all-in-one machine |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE529959C (en) * | 1929-01-01 | 1931-07-18 | Otto Max Mueller | Procedure for post or. Fine grinding or finishing of the outer circumferential surfaces of non-circular attachments of a shaft, in particular the cams of a camshaft |
DE678981C (en) * | 1936-10-28 | 1939-07-26 | Friedrich Deckel Praez S Mecha | Method for grinding camshafts |
US2654189A (en) * | 1951-02-02 | 1953-10-06 | Landis Tool Co | Apparatus for grinding noncylindrical surfaces |
GB1062818A (en) | 1963-08-09 | 1967-03-22 | Toyo Kogyo Kabushiki Kaisha | Rotating type cam grinding machine |
IT1155645B (en) | 1982-03-17 | 1987-01-28 | Fiat Auto Spa | PROCEDURE FOR OBTAINING THE WORK SURFACE OF A CAM AND MACHINE TO IMPLEMENT IT |
US4580368A (en) * | 1982-11-30 | 1986-04-08 | Energy Adaptive Grinding, Inc. | Centerless and center-type grinding systems |
DE3724698A1 (en) | 1987-07-25 | 1989-02-02 | Schaudt Maschinenbau Gmbh | GRINDING HEAD |
DE4137924C2 (en) * | 1991-11-18 | 1997-12-04 | Schaudt Maschinenbau Gmbh | Method and device for numerically controlled grinding of cams of a camshaft |
DE4235408A1 (en) | 1992-10-21 | 1994-04-28 | Schaudt Maschinenbau Gmbh | Method and device for grinding non-circular workpieces |
DE4426452C1 (en) * | 1994-07-26 | 1995-09-07 | Erwin Junker | Process for grinding concave flanks of cams of camshaft |
-
1996
- 1996-05-23 DE DE19620813A patent/DE19620813C2/en not_active Expired - Lifetime
-
1997
- 1997-05-07 EP EP97923019A patent/EP0904176B1/en not_active Expired - Lifetime
- 1997-05-07 WO PCT/EP1997/002356 patent/WO1997044159A1/en not_active Application Discontinuation
- 1997-05-07 BR BR9709022-0A patent/BR9709022A/en not_active Application Discontinuation
- 1997-05-07 GE GEAP19974617A patent/GEP20012496B/en unknown
- 1997-05-07 KR KR1019980709480A patent/KR20000015927A/en not_active Application Discontinuation
- 1997-05-07 DE DE59706048T patent/DE59706048D1/en not_active Expired - Fee Related
- 1997-05-07 US US09/180,987 patent/US6200200B1/en not_active Expired - Fee Related
- 1997-05-07 CA CA002256430A patent/CA2256430A1/en not_active Abandoned
- 1997-05-07 JP JP09541459A patent/JP2000510771A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO9744159A1 * |
Also Published As
Publication number | Publication date |
---|---|
CA2256430A1 (en) | 1997-11-27 |
EP0904176B1 (en) | 2001-11-21 |
GEP20012496B (en) | 2001-07-25 |
KR20000015927A (en) | 2000-03-15 |
WO1997044159A1 (en) | 1997-11-27 |
DE59706048D1 (en) | 2002-02-21 |
DE19620813C2 (en) | 2000-07-20 |
DE19620813A1 (en) | 1997-11-27 |
JP2000510771A (en) | 2000-08-22 |
US6200200B1 (en) | 2001-03-13 |
BR9709022A (en) | 2000-01-04 |
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