EP0661136B1 - Procédé de rodage de la surface d'une pièce et rodoir pour la mise en oeuvre de ce procédé - Google Patents
Procédé de rodage de la surface d'une pièce et rodoir pour la mise en oeuvre de ce procédé Download PDFInfo
- Publication number
- EP0661136B1 EP0661136B1 EP19940402696 EP94402696A EP0661136B1 EP 0661136 B1 EP0661136 B1 EP 0661136B1 EP 19940402696 EP19940402696 EP 19940402696 EP 94402696 A EP94402696 A EP 94402696A EP 0661136 B1 EP0661136 B1 EP 0661136B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lapping
- protuberance
- honing
- area
- honed
- 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.)
- Expired - Lifetime
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Images
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
- B24B33/00—Honing machines or devices; Accessories therefor
- B24B33/08—Honing tools
- B24B33/085—Honing tools in which the honing element consists of a deformable body
-
- 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
- B24B33/00—Honing machines or devices; Accessories therefor
- B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes
Definitions
- the present invention relates to a lapping method of the surface of a part, in particular the internal surface of a cylindrical bore formed therein.
- Certain parts such as, for example, valves, gears, cams or cylinders of engines to explosion, are intended to undergo repeated displacement and at high speed by rubbing contact.
- the aforementioned excess material is present under the thicker protuberance, localized in particular in the end zones of the part, in particular when this part has on its surface a coating of hard metal, such than chromium or nickel-silicon, obtained by deposition electrolytic.
- lappers of the expansion type which have a pin capable of being driven in rotation around its longitudinal axis, a mandrel retained by one of its ends by the spindle, a guide sleeve into which the mandrel can slide axially and an external abrasive surface capable of being radially spaced from said longitudinal axis under the effect of the mandrel pushing when the mandrel is moved axially.
- Document DE-A-3738074 describes a lapping machine of this type, the external abrasive surface successively comprises, in moving away from the spindle, a conical part which narrows towards the spindle and which is a guide zone, a cylindrical part which is a calibration zone and a other conical part which widens towards the spindle and that is a cutting area.
- Document EP-A-0 219 825 describes a lapping machine comprising a cylindrical part surmounted by a conical part is shrinking upward and used to remove shavings.
- the object of the present invention is to eliminate the disadvantages mentioned above and to propose a method of running in to eliminate the protrusions of the surface of the workpiece without excessive wear of the abrasive materials and perform a reliable calibration and precise of it.
- the present invention relates to a running-in process of the surface of a part, in particular the internal surface a bore formed therein, consisting of drive a lapping tool rotating around its longitudinal axis, to bring the abrasive surface external of the lapper in contact with the facing surface of the part to be lapped and to move the lapper axially along this surface so as to break in an area to protuberance thereof, characterized in that it consists in calibrating a first cylindrical part of said abrasive surface by bringing it into contact with a reference area of the surface to be lapped, to be eliminated gradually said protuberance by bringing it in contact with a second party, preferably frustoconical, of the external abrasive surface, and calibrate the area whose protuberance is eliminated by bringing it into contact with said first part cylindrical previously calibrated.
- the method consists in calibrating the first cylindrical part, to gradually eliminate the protrusion of the area to be lapped from the end of smaller external diameter of the second part and at calibrate this lapped area in a single pass of the lapping on the lapping surface.
- the method advantageously consists in adjusting the difference between the diameter outer of the two longitudinal ends of the second part at a value greater than twice the thickness of the protuberance to be eliminated.
- Figures 1 and 2 show a lapping type expansion according to a first embodiment.
- This lapper has a spindle 1 capable of being driven rotating around its longitudinal axis 2 by a drive shaft (not shown in the drawing).
- a mandrel 3 is retained by one of its ends 3a by pin 1 and has at its opposite end two frustoconical surfaces 4a and 4b forming a surface support.
- the smaller diameter end of the first frustoconical bearing 4a is connected by a section cylindrical 5 at the larger diameter end of the second frustoconical bearing 4b.
- the mandrel 3 can slide axially in a sleeve cylindrical guide 6 which is connected by its upper end by a nut 7 to the lapping frame 8.
- a screw 9 protrudes radially from the surface external part of the central part of the mandrel 3 and comes be housed in a longitudinal blind recess 6a formed in the inner wall of the sleeve 6.
- Each support piece 10 has two parts end 10a separated by a central part 10b, said end portions 10a having a portion scalloped surface 10c of shape corresponding to external frustoconical surfaces of the spans 4a and 4b.
- end portions 10a are arranged circularly respectively around the spans frustoconical 4a and 4b.
- the number of supporting pieces 10 is generally understood between 3 and 12.
- the support pieces 10 are housed in openings longitudinal formed in the lower part of the sleeve 6.
- An upper sleeve 11 is fitted on the part upper part of sleeve 6 and fixed thereon by a nut 12 and a lock nut 13.
- a lower sleeve it is fitted on the lower part of the sleeve 6, and ensures the plating of an elastic washer 22 on the latter, the washer 22 ensuring the maintenance of the plates 14 resting on the upper sheath 11.
- the lower sleeve lla is fixed by a nut 12a and a lock nut 13a.
- Longitudinal through holes 6b, formed radially in the sleeve 6, are capable of receiving plates 14 forming cylinder portions.
- the plates 14 can be separated radially by the supporting parts 10 and are subjected to a force of return to longitudinal axis 2 by means elastic (not shown in the drawing).
- the plates 14 have an external coating abrasive (represented in the drawing by dotted lines), such as diamond grains or a lapping stone, intended for lapping the surface of a part, for example the internal surface 15a of a bore 15 formed in a cylinder 16.
- an external coating abrasive represented in the drawing by dotted lines
- diamond grains or a lapping stone intended for lapping the surface of a part, for example the internal surface 15a of a bore 15 formed in a cylinder 16.
- the plates 14 are circularly separated by smooth cylindrical portions of the sleeve 6, which has as a consequence that the lapping has a surface discontinuous external abrasive (see figure 2).
- the outer surface of the plates 14 has a first cylindrical part 14a and a second part 14b frustoconical (separated in FIGS. 1 and 3 by a mixed line), said parts 14a and 14b being adjacent by their larger diameter end, so as to form a one-piece body.
- FIG. 3 represents an alternative embodiment of a lapping.
- This lapper has a 3 'mandrel consisting of a rod 17 which is extended by a part 18 whose surface external is substantially frustoconical.
- the mandrel 3 ' is capable of sliding axially in a cylindrical guide sleeve 6 'which is secured by its lower end of a deformable sleeve thin metal 19 provided with slots longitudinal 19a. These longitudinal slots 19a allow a slight expansion of the sleeve 19 under the thrust of the frustoconical part 18 when it is moved axially down.
- the deformable sleeve 19 has an internal surface of shape corresponding to the external surface of the frustoconical part 18.
- the external surface of the deformable sleeve 19 includes a abrasive coating and has a first part cylindrical 20 and a second frustoconical part 21, with like the lapping illustrated in Figures 1 and 2.
- the second frustoconical part 14b, 21 of the surface external abrasive of the lapping has a slope by relative to the axis of the lapping advantageously understood between 2% and 10% and the ratio between the length of the cylindrical part and the total length of the part abrasive is advantageously between 1/5 and 1/3.
- the second part 14b, 21 is not limited to a frustoconical shape and may have a convex or concave external surface, from the moment where its outer diameter decreases along the direction longitudinal of the lapping between one more end large diameter and one end smaller diameter.
- the lapping is arranged vertically, but of course it can be arranged horizontally or in an inclined position.
- Figure 4 shows the main stages of the break-in process of the invention according to their respective duration.
- Step "a” consists of lowering the lapping point to the inside of a bore in a cylinder until the external abrasive surface of the lapping either facing the internal surface of the bore.
- Step "b” consists in spreading the surface radially external abrasive of the lapping by moving axially towards bottom of the lapping mandrel.
- Step "c” consists of bringing the surface into contact external abrasive of the lapping with a reference zone on the internal surface of the bore, so that calibrate the first cylindrical part.
- Step “d” consists in raising the lapping vertically, after blocking the mandrel in the lapping frame, to gradually break in an annular bead which protrudes radially from the upper end of the bore and, once the bead has been removed, come calibrate this previously protruding area.
- Step "e” consists in stopping the rotation of the lapping machine once it is out of the bore and at relax the external abrasive surface of the lapping previously ruled out.
- This relaxation is obtained by a displacement vertical up the mandrel inside its guide sleeve, causing a return of the surface external abrasive towards the longitudinal axis of the lapping by elastic means.
- Step "f” consists in rotating the lapping machine around of its longitudinal axis and this during steps “a” to “d".
- a hollow lapping having a abrasive surface facing inward to come in for example the outer peripheral surface of a tree or any cylindrical zone of a part of revolution.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Description
Claims (3)
- Procédé de rodage de la surface d'une pièce, notamment la surface interne d'un alésage ménagé dans celle-ci, consistant à entraíner un outil formant rodoir en rotation autour de son axe longitudinal, à amener la surface abrasive externe du rodoir en contact avec la surface en regard de la pièce à roder et à déplacer axialement le rodoir le long de cette surface de manière à roder une zone à protubérance de celle-ci, caractérisé en ce qu'il consiste à étalonner une première partie cylindrique (14a, 20) de ladite surface abrasive en l'amenant en contact avec une zone de référence de la surface (15a) à roder, à éliminer progressivement ladite protubérance (16a) en l'amenant en contact avec une seconde partie (14b, 21), de préférence tronconique, de la surface abrasive externe, et à calibrer la zone dont la protubérance (16a) a été éliminée en l'amenant en contact avec ladite première partie cylindrique (14a, 20) préalablement étalonnée.
- Procédé selon la revendication 1, caractérisé en ce qu'il consiste à étalonner la première partie cylindrique (14a, 20) à éliminer progressivement la protubérance (16a) de la zone à roder à partir de l'extrémité de plus faible diamètre externe de ladite seconde partie (14b, 21) et à calibrer cette zone rodée (16a) en un seul passage du rodoir sur la surface (15a) à roder.
- Procédé selon la revendication 1 ou 2, caractérisé en ce qu'il consiste à régler l'écart entre le diamètre externe des deux extrémités longitudinales de ladite seconde partie (14b, 21) à une valeur supérieure au double de l'épaisseur de la protubérance (16a) à éliminer.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9314325 | 1993-11-30 | ||
FR9314325A FR2713123B1 (fr) | 1993-11-30 | 1993-11-30 | Procédé de rodage de la surface d'une pièce et rodoir pour la mise en Óoeuvre de ce procédé. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0661136A1 EP0661136A1 (fr) | 1995-07-05 |
EP0661136B1 true EP0661136B1 (fr) | 2000-05-10 |
Family
ID=9453375
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19940402696 Expired - Lifetime EP0661136B1 (fr) | 1993-11-30 | 1994-11-24 | Procédé de rodage de la surface d'une pièce et rodoir pour la mise en oeuvre de ce procédé |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0661136B1 (fr) |
DE (1) | DE69424391D1 (fr) |
FR (1) | FR2713123B1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105538123B (zh) * | 2016-02-04 | 2018-02-23 | 常州中车柴油机零部件有限公司 | 一种异形内孔珩磨头及其构造方法 |
CN114559363A (zh) * | 2022-01-28 | 2022-05-31 | 宁夏银川大河数控机床有限公司 | 一种抛光珩磨头 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2460997C3 (de) * | 1974-12-21 | 1984-01-26 | Nagel Maschinen- und Werkzeugfabrik GmbH, 7440 Nürtingen | Honwerkzeug zur Bearbeitung zylindrischer Werkstückbohrungen |
DE3537009A1 (de) * | 1985-10-17 | 1987-04-23 | Nagel Wolf | Verfahren, honmaschine und honwerkzeug zur honbearbeitung von werkstuecken |
DE3738074A1 (de) * | 1987-11-10 | 1989-05-18 | Peter Nagel | Vorrichtung zur honbearbeitung von werkstuecken |
-
1993
- 1993-11-30 FR FR9314325A patent/FR2713123B1/fr not_active Expired - Fee Related
-
1994
- 1994-11-24 EP EP19940402696 patent/EP0661136B1/fr not_active Expired - Lifetime
- 1994-11-24 DE DE69424391T patent/DE69424391D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR2713123B1 (fr) | 1996-01-26 |
FR2713123A1 (fr) | 1995-06-09 |
DE69424391D1 (de) | 2000-06-15 |
EP0661136A1 (fr) | 1995-07-05 |
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