EP0430816A1 - Method and machine for honing bores in workpieces - Google Patents
Method and machine for honing bores in workpieces Download PDFInfo
- Publication number
- EP0430816A1 EP0430816A1 EP90403419A EP90403419A EP0430816A1 EP 0430816 A1 EP0430816 A1 EP 0430816A1 EP 90403419 A EP90403419 A EP 90403419A EP 90403419 A EP90403419 A EP 90403419A EP 0430816 A1 EP0430816 A1 EP 0430816A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lapping
- expansion
- progressive
- line
- lines
- 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.)
- Withdrawn
Links
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
- B24B33/02—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 method for lapping bores in parts, as well as to a machine for implementing this method.
- Lapping (called “honing” in the Anglo-Saxon literature) of bores is carried out at present, either according to the lapping process known as by expansion, or according to the lapping process known as progressive.
- Lapping by expansion consists in introducing, into the bore to be lapped, an expansion lapping machine animated with a rotary movement and an oscillating movement back and forth along the axis of rotation and in increasing the diameter of the lapping during running in. This expansion is therefore comparable to the advance movement that a tool undergoes during machining operations such as grinding.
- the main advantage of lapping by expansion is that it allows, thanks to the expansion of the lapping during lapping, to remove a comparatively large amount of material in a single pass.
- the main drawback of lapping by expansion consists in the fact that a coarse grinding abrasive expansion lapping such as is necessary to obtain a large material removal in a single pass, allows only a relatively low precision and above all a relatively poor surface finish.
- the progressive lapping consists in making a lapping of a fixed diameter, animated by a movement of a rotation about its axis, a single movement back and forth (back and forth) in a bore. Since the quantity of material removed on each pass is small, it is necessary, when the total quantity of material to be removed is large, to subject each bore to a relatively large number of progressive lapping passes using a relatively number important of successive lappers having increasingly fine grains. This progressive lapping makes it possible to obtain high precision and a good surface condition, but this by means of the use of a large number of lapping devices when the quantity of material to be removed is large. Each of these progressive lappers must be adjusted with precision, so that the setting time of a progressive lapping machine comprising a large number of lappers is long. In addition, the cost price and the size of the lapping machine increases with the number of laps.
- the present invention relates to a lapping process for bores meeting the two requirements of high precision and significant removal of material.
- the subject of the invention is also a machine of relatively simple and compact structure and of a reduced cost price allowing a precise running-in, with reduced setting times, on bores requiring a significant removal of material.
- each bore is subjected successively to a roughing by lapping by expansion followed by a finishing by progressive lapping.
- the roughing can comprise one or two lapping passes by expansion and the finishing can comprise at least two progressive lapping passes.
- the machine according to the invention for lapping bore in parts comprises at least one spindle for expansion by lapping, at least two spindles for progressive lapping, and means for bringing each part successively to the spindle for expansion by lapping and each of the progressive lapping pins.
- a progressive lapping pass requires a time which is substantially half that of an expansion lapping pass. This is the reason why the machine according to the invention can advantageously comprise two parallel lines of lapping by expansion and a single line of progressive lapping, means being provided for bringing to the single line of progressive lapping the rough parts coming from of either of the two lapping lines by expansion.
- the single progressive lapping line and each of the two expansion lapping lines are provided with independent feed conveyors for the parts
- the machine is supplied with parts by the conveyor a first of the two lapping lines by expansion
- the progressive lapping line is arranged downstream of the second lapping line by expansion
- two independent shuttle carriers are arranged between the two lapping lines by expansion, upstream and downstream of these.
- a scrap reception line also served by the downstream shuttle transporter is disposed downstream of the first lapping line by expansion.
- Figures 1 and 2 show, one in side view and the other in plan, a lapping machine according to the invention combining expansion lapping and progressive lapping.
- the lapping machine as illustrated in FIGS. 1 and 2 comprises, on a common frame 1, a first line 2 of lapping by expansion, a second line 3 of lapping by expansion and a line 4 of progressive lapping.
- the two lines 2, 3 for lapping by parallel expansion are each served by a conveyor 5, 6, the supply of the machine with the lapping part being effected by the conveyor 5 serving line 2.
- Line 4 for progressive lapping is served by a transporter 7 which is located downstream and in the extension of the transporter 6 from the second line 3 of lapping by expansion. It is also by the transporter 7 that the lapped parts of the machine are removed.
- a waste reception line 8 is served by a transporter 9 mounted downstream and in the extension of the transporter 5.
- a first shuttle conveyor 10 is arranged upstream of the two lines 2, 3 for lapping by expansion and a second shuttle conveyor 11 is arranged downstream of the two lines 2, 3 for lapping by expansion, that is to say also upstream of the progressive lapping line 4 and of the scrap reception line 8.
- carriers 5, 6, 7, 9, 10 and 11 are independent carriers.
- the first line of lapping by expansion comprises a lapping unit 12 with a single spindle 13 of lapping by expansion, the lapping unit 12 being followed by a control unit 14.
- the second line 3 of lapping by expansion comprises a lapping unit 15 with a single spindle 16 for lapping by expansion, the lapping unit 15 being followed by a control unit 17.
- the progressive lapping line 4 comprises a lapping unit 18 with three pins 19, 20, 21 of progressive lapping, the laps of which are filled with abrasive with grains of increasing fineness.
- the combination, on a single machine, of lapping by expansion and progressive lapping allows, by means of a reduced number of lapping, to operate precision lapping on bores having initially wide tolerances, lapping by expansion providing a roughing followed by '' a gradual lapping finish with a reduced number of laps.
- the parallel arrangement of two lapping lines by expansion, the provision of independent transporters for each of the lapping lines, and the arrangement of two shuttle carriers one upstream and the other downstream of the two lapping lines by expansion allows the two roughing lines to be machined optimally by expansion lapping and, after the roughing, to direct the rough parts, according to their state, either on the single finishing line 4 by progressive running-in, ie on line 8 for receiving scrap.
- each bore to more than one roughing pass by lapping by expansion and / or to provide a finish comprising a number of progressive lapping passes other than three.
- the invention is also applicable to lapping machines comprising a single roughing line by expansion lapping and / or more than one finishing line by progressive lapping, although the arrangement shown and described constitutes a solution. preferred from the performance point of view, taking into account the different times of expansion lapping and progressive lapping.
Landscapes
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
La présente invention se rapporte à un procédé de rodage d'alésage dans des pièces, ainsi qu'à une machine pour la mise en oeuvre de ce procédé.The present invention relates to a method for lapping bores in parts, as well as to a machine for implementing this method.
Le rodage (appelé "honing" dans la littérature anglo-saxonne) d'alésages s'effectue à l'heure actuelle, soit suivant le procédé de rodage dit par expansion, soit suivant le procédé de rodage dit progressif.Lapping (called "honing" in the Anglo-Saxon literature) of bores is carried out at present, either according to the lapping process known as by expansion, or according to the lapping process known as progressive.
Le rodage par expansion consiste à introduire, dans l'alésage à roder, un rodoir à expansion animé d'un mouvement de rotation et d'un mouvement oscillatoire en va-et-vient suivant l'axe de rotation et à augmenter le diamètre du rodoir au cours du rodage. Cette expansion est donc comparable au mouvement d'avance que subit un outil lors d'opérations d'usinage telles que la rectification. Le principal avantage du rodage par expansion consiste dans le fait qu'il permet, grâce à l'expansion du rodoir en cours de rodage, d'enlever une quantité comparativement importante de matériau en une seule passe. Le principal inconvénient du rodage par expansion consiste dans le fait qu'un rodoir à expansion à abrasif à gros grains tel qu'il est nécessaire pour obtenir un enlèvement de matière important en une seule passe, ne permet qu'une précision relativement faible et surtout un état de surface relativement médiocre.Lapping by expansion consists in introducing, into the bore to be lapped, an expansion lapping machine animated with a rotary movement and an oscillating movement back and forth along the axis of rotation and in increasing the diameter of the lapping during running in. This expansion is therefore comparable to the advance movement that a tool undergoes during machining operations such as grinding. The main advantage of lapping by expansion is that it allows, thanks to the expansion of the lapping during lapping, to remove a comparatively large amount of material in a single pass. The main drawback of lapping by expansion consists in the fact that a coarse grinding abrasive expansion lapping such as is necessary to obtain a large material removal in a single pass, allows only a relatively low precision and above all a relatively poor surface finish.
C'est la raison pour laquelle il a déjà été proposé de soumettre des alésages à deux passes de rodage par expansion, la première passe constituant un ébauchage s'effectuant à l'aide d'un rodoir à expansion à abrasif à gros grains et la deuxième passe constituant une finition s'effectuant à l'aide d'un rodoir à abrasif à grains fins. Cependant cette deuxième passe de finition ne permet pas toujours d'obtenir la précision et l'état de surface nécessaires.This is the reason why it has already been proposed to subject bores to two expansion lapping passes, the first pass constituting a roughing-up carried out using a coarse grinding abrasive lapping and the second pass constituting a finishing effecting using a fine-grained abrasive lapping. However, this second finishing pass does not always allow the necessary precision and surface condition to be obtained.
Le rodage progressif consiste à faire effectuer à un rodoir de diamètre fixe, animé d'un mouvement d'un rotation autour de son axe, un seul mouvement de va-et-vient (aller et retour) dans un alésage. La quantité de matière enlevée à chaque passe étant faible, il est nécessaire, lorsque la quantité totale de matière à enlever est importante, de faire subir à chaque alésage un nombre relativement important de passes de rodage progressif à l'aide d'un nombre relativement important de rodoirs successifs ayant des grains de plus en plus fins. Ce rodage progressif permet d'obtenir une grande précision et un bon état de surface, mais cela moyennant la mise en oeuvre d'un grand nombre de rodoirs lorsque la quantité de matière à enlever est importante. Chacun de ces rodoirs progressifs doit être réglé avec précision, de sorte que le temps de réglage d'une machine de rodage progressif comprenant un grand nombre de rodoirs est long. De plus, le prix de revient et l'encombrement de la machine de rodage augmente avec le nombre des rodoirs.The progressive lapping consists in making a lapping of a fixed diameter, animated by a movement of a rotation about its axis, a single movement back and forth (back and forth) in a bore. Since the quantity of material removed on each pass is small, it is necessary, when the total quantity of material to be removed is large, to subject each bore to a relatively large number of progressive lapping passes using a relatively number important of successive lappers having increasingly fine grains. This progressive lapping makes it possible to obtain high precision and a good surface condition, but this by means of the use of a large number of lapping devices when the quantity of material to be removed is large. Each of these progressive lappers must be adjusted with precision, so that the setting time of a progressive lapping machine comprising a large number of lappers is long. In addition, the cost price and the size of the lapping machine increases with the number of laps.
La présente invention a pour objet un procédé de rodage d'alésages répondant aux deux impératifs de précision élevée et d'enlèvement important de matière. L'invention a également pour objet une machine de structure relativement simple et compacte et d'un prix de revient réduit permettant un rodage de précision, avec des temps de réglage réduits, sur des alésages nécessitant un enlèvement important de matière.The present invention relates to a lapping process for bores meeting the two requirements of high precision and significant removal of material. The subject of the invention is also a machine of relatively simple and compact structure and of a reduced cost price allowing a precise running-in, with reduced setting times, on bores requiring a significant removal of material.
Suivant le procédé conforme à l'invention de rodage d'alésages dans des pièces, on soumet chaque alésage successivement à un ébauchage par rodage par expansion suivi d'une finition par rodage progressif.According to the process according to the invention of lapping of bores in parts, each bore is subjected successively to a roughing by lapping by expansion followed by a finishing by progressive lapping.
Dans le cadre de l'invention, l'ébauchage peut comprendre une ou deux passes de rodage par expansion et la finition peut comprendre au moins deux passes de rodage progressif.Within the framework of the invention, the roughing can comprise one or two lapping passes by expansion and the finishing can comprise at least two progressive lapping passes.
La machine conforme à l'invention de rodage d'alésage dans des pièces comprend au moins une broche de rodage par expansion, au moins deux broches de rodage progressif, et des moyens pour amener chaque pièce successivement à la broche de rodage par expansion et à chacune des broches de rodage progressif.The machine according to the invention for lapping bore in parts comprises at least one spindle for expansion by lapping, at least two spindles for progressive lapping, and means for bringing each part successively to the spindle for expansion by lapping and each of the progressive lapping pins.
D'une manière générale, une passe de rodage progressif demande un temps qui est sensiblement de moitié inférieur à celui d'une passe de rodage par expansion. C'est la raison pour laquelle la machine conforme à l'invention peut avantageusement comprendre deux lignes parallèles de rodage par expansion et une seule ligne de rodage progressif, des moyens étant prévus pour amener à l'unique ligne de rodage progressif les pièces ébauchées venant de l'une et de l'autre des deux lignes de rodage par expansion.Generally speaking, a progressive lapping pass requires a time which is substantially half that of an expansion lapping pass. This is the reason why the machine according to the invention can advantageously comprise two parallel lines of lapping by expansion and a single line of progressive lapping, means being provided for bringing to the single line of progressive lapping the rough parts coming from of either of the two lapping lines by expansion.
Suivant un mode de réalisation préféré de l'invention, l'unique ligne de rodage progressif et chacune des deux lignes de rodage par expansion sont munies de transporteurs d'avancement indépendants pour les pièces, la machine est alimentée en pièces par le transporteur d'une première des deux lignes de rodage par expansion, la ligne de rodage progressif est disposée en aval de la deuxième ligne de rodage par expansion, et deux transporteurs-navettes indépendants sont disposés entre les deux lignes de rodage par expansion, en amont et en aval de ces dernières.According to a preferred embodiment of the invention, the single progressive lapping line and each of the two expansion lapping lines are provided with independent feed conveyors for the parts, the machine is supplied with parts by the conveyor a first of the two lapping lines by expansion, the progressive lapping line is arranged downstream of the second lapping line by expansion, and two independent shuttle carriers are arranged between the two lapping lines by expansion, upstream and downstream of these.
De préférence, une ligne de réception de rebut également desservie par le transporteur-navette aval est disposé en aval de la première ligne de rodage par expansion.Preferably, a scrap reception line also served by the downstream shuttle transporter is disposed downstream of the first lapping line by expansion.
En se référant aux dessins schématiques annexés, on va décrire ci-après plus en détail un mode de réalisation illustratif et non limitatif de l'objet de l'invention; sur les dessins:Referring to the accompanying schematic drawings, an illustrative and nonlimiting embodiment of the subject of the invention will be described below in more detail; on the drawings:
les figures 1 et 2 représentent, l'une en vue latérale et l'autre en plan, une machine de rodage conforme à l'invention combinant le rodage par expansion et le rodage progressif.Figures 1 and 2 show, one in side view and the other in plan, a lapping machine according to the invention combining expansion lapping and progressive lapping.
La machine de rodage telle qu'illustrée par les figures 1 et 2 comprend, sur un bâti 1 commun, une première ligne 2 de rodage par expansion, une deuxième ligne 3 de rodage par expansion et une ligne 4 de rodage progressif.The lapping machine as illustrated in FIGS. 1 and 2 comprises, on a common frame 1, a
Les deux lignes 2, 3 de rodage par expansion en parallèle sont desservies chacune par un transporteur 5, 6, l'alimentation de la machine en pièce à roder s'effectuant par le transporteur 5 desservant la ligne 2. La ligne 4 de rodage progressif est desservie par un transporteur 7 qui se trouve en aval et dans le prolongement du transporteur 6 de la deuxième ligne 3 de rodage par expansion. C'est également par le transporteur 7 que s'effectue l'évacuation des pièces rodées de la machine.The two
Une ligne 8 de réception de rebut est desservie par un transporteur 9 monté en aval et dans le prolongement du transporteur 5.A waste reception line 8 is served by a transporter 9 mounted downstream and in the extension of the
Un premier transporteur-navette 10 est disposé en amont des deux lignes 2, 3 de rodage par expansion et un deuxième transporteur-navette 11 est disposé en aval des deux lignes 2, 3 de rodage par expansion, c'est-à-dire également en amont de la ligne 4 de rodage progressif et de la ligne 8 de réception de rebut.A
Il est à noter que les transporteurs 5, 6, 7, 9, 10 et 11 sont des transporteurs indépendants.It should be noted that
La première ligne 2 de rodage par expansion comprend une unité de rodage 12 avec une unique broche 13 de rodage par expansion, l'unité de rodage 12 étant suivie d'une unité de contrôle 14. De façon analogue, la deuxième ligne 3 de rodage par expansion comprend une unité de rodage 15 avec une unique broche 16 de rodage par expansion, l'unité de rodage 15 étant suivie d'une unité de contrôle 17.The first line of lapping by expansion comprises a
La ligne 4 de rodage progressif comprend une unité de rodage 18 avec trois broches 19, 20, 21 de rodage progressif dont les rodoirs sont garnis d'abrasif à grains de finesse croissante.The
La combinaison, sur une seule machine, du rodage par expansion et du rodage progressif permet, moyennant un nombre réduit de rodoirs, d'opérer un rodage de précision sur des alésages ayant initialement des tolérances larges, le rodage par expansion procurant un ébauchage suivi d'une finition par un rodage progressif avec un nombre réduit de rodoirs.The combination, on a single machine, of lapping by expansion and progressive lapping allows, by means of a reduced number of lapping, to operate precision lapping on bores having initially wide tolerances, lapping by expansion providing a roughing followed by '' a gradual lapping finish with a reduced number of laps.
La disposition en parallèle de deux lignes de rodage par expansion, la prévision de transporteurs indépendants pour chacune des lignes de rodage, et la disposition de deux transporteurs-navettes l'un en amont et l'autre en aval des deux lignes de rodage par expansion permet de desservir de façon optimale en pièces à usiner les deux lignes d'ébauchage par rodage par expansion et, à la suite de l'ébauchage, d'aiguiller les pièces ébauchées, selon leur état, soit sur l'unique ligne 4 de finition par rodage progressif, soit sur la ligne 8 de réception de rebut.The parallel arrangement of two lapping lines by expansion, the provision of independent transporters for each of the lapping lines, and the arrangement of two shuttle carriers one upstream and the other downstream of the two lapping lines by expansion allows the two roughing lines to be machined optimally by expansion lapping and, after the roughing, to direct the rough parts, according to their state, either on the
Bien entendu, l'invention n'est pas limitée aux modes de réalisation représentés et décrits. Il serait ainsi possible, dans le cadre de l'invention, de soumettre chaque alésage à plus d'une passe d'ébauchage par rodage par expansion et/ou de prévoir une finition comprenant un nombre de passes de rodage progressif différent de trois.Of course, the invention is not limited to the embodiments shown and described. It would thus be possible, within the scope of the invention, to subject each bore to more than one roughing pass by lapping by expansion and / or to provide a finish comprising a number of progressive lapping passes other than three.
Par ailleurs, l'invention est applicable également à des machines de rodage comprenant une seule ligne d'ébauchage par rodage par expansion et/ou plus d'une ligne de finition par rodage progressif, bien que l'agencement représenté et décrit constitue une solution préférée du point de vue rendement, compte tenu des temps différents du rodage par expansion et du rodage progressif.Furthermore, the invention is also applicable to lapping machines comprising a single roughing line by expansion lapping and / or more than one finishing line by progressive lapping, although the arrangement shown and described constitutes a solution. preferred from the performance point of view, taking into account the different times of expansion lapping and progressive lapping.
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8915837A FR2654969B1 (en) | 1989-11-30 | 1989-11-30 | METHOD FOR LODING HORNS IN PARTS, AND MACHINE FOR IMPLEMENTING THIS METHOD. |
| FR8915837 | 1989-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0430816A1 true EP0430816A1 (en) | 1991-06-05 |
Family
ID=9388004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90403419A Withdrawn EP0430816A1 (en) | 1989-11-30 | 1990-11-30 | Method and machine for honing bores in workpieces |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0430816A1 (en) |
| FR (1) | FR2654969B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2767276B1 (en) * | 1997-08-14 | 1999-10-29 | Spms Honimatic | MULTI-SPINDLE LAPPING MACHINE |
| US6250999B1 (en) * | 1997-09-12 | 2001-06-26 | Spms Honimatic | Multi-spindle lapping machine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE871707C (en) * | 1951-09-26 | 1953-03-26 | Kordt & Co G M B H | Method and machine for lapping holes |
| GB1337272A (en) * | 1970-01-13 | 1973-11-14 | Hartle Ltd Derek | Honing tool arrangements |
| US4397384A (en) * | 1981-03-06 | 1983-08-09 | Nohren Jr John E | Manufacturing system and transport assembly |
| WO1988009080A1 (en) * | 1987-05-07 | 1988-11-17 | Black & Decker Inc. | Streamlined production of electric motor armatures and stators |
-
1989
- 1989-11-30 FR FR8915837A patent/FR2654969B1/en not_active Expired - Fee Related
-
1990
- 1990-11-30 EP EP90403419A patent/EP0430816A1/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE871707C (en) * | 1951-09-26 | 1953-03-26 | Kordt & Co G M B H | Method and machine for lapping holes |
| GB1337272A (en) * | 1970-01-13 | 1973-11-14 | Hartle Ltd Derek | Honing tool arrangements |
| US4397384A (en) * | 1981-03-06 | 1983-08-09 | Nohren Jr John E | Manufacturing system and transport assembly |
| WO1988009080A1 (en) * | 1987-05-07 | 1988-11-17 | Black & Decker Inc. | Streamlined production of electric motor armatures and stators |
Non-Patent Citations (1)
| Title |
|---|
| VDI ZEITSCHRIFT. vol. 127, no. 18, septembre 1985, DUSSELDORF DE page 720 "Mehrfachhonen von Lagerbohrungen" * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2654969A1 (en) | 1991-05-31 |
| FR2654969B1 (en) | 1994-07-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FR2651705A1 (en) | METHOD FOR FINISHING FLANGES OF TOOTHED WHEELS, ESPECIALLY TEMPERED, AND TOOL FOR IMPLEMENTING SAID METHOD | |
| EP0640435B1 (en) | Grinding machine | |
| EP0495691A1 (en) | Cylindrical grinding machine | |
| EP0430816A1 (en) | Method and machine for honing bores in workpieces | |
| FR2593734A1 (en) | MILLING MACHINE, ESPECIALLY FOR THE DEGREASING AND FINISHING OF LONG CYLINDRICAL OBJECTS | |
| FR2485423A1 (en) | FOREST POINT GRINDING MACHINE | |
| FR2463232A1 (en) | TOOLS FOR THE EXTRACTION OF ROCKS AND MINERALS | |
| FR2720964A1 (en) | Device for cutting parts on a lathe. | |
| GB2329350A (en) | Improved grinding process. | |
| CH675219A5 (en) | ||
| FR2752760A1 (en) | MACHINING UNIT WITH ROTATING HEAD | |
| FR2535637A1 (en) | METHOD AND DEVICE FOR MACHINING BY ELECTRIC SHOCK WITH A MOBILE WIRE SUPPORT | |
| US3045399A (en) | Method for honing bearing surfaces | |
| FR2488541A1 (en) | Programmable rectifying grinding machine - uses slide mounted self-redressing grinders serving turntable with chucks for individual work pieces | |
| FR2583664A1 (en) | Machine tool for cutting a cylindrical surface | |
| FR2521896A1 (en) | SINGLE PASS CALIBRATION TOOL AND WEAR COMPENSATION MACHINE | |
| EP0342153B1 (en) | Auxiliary device for precisely turning a work piece | |
| EP0478439B1 (en) | Machine for manufacturing ground screws starting from rods | |
| SU1079420A1 (en) | Apparatus for dressing a grinding wheel with a diamond roller | |
| FR2464130A1 (en) | IMPROVEMENTS IN OR RELATING TO SURFACING DEVICES, PARTICULARLY FOR PERFORMING WORKS FOR FINISHING PIECES OF WOOD | |
| FR2948589A1 (en) | ABRASIVE STONE RODOR AND METHOD OF RUNNING USING THE RODOR | |
| BE897754A (en) | AUTOMATIC DUAL COMPENSATION WHEEL CONDITIONING METHOD AND DEVICE | |
| FR2575953A1 (en) | Centreless grinding machine for external cylindrical grinding of hollow cylindrical parts, in particular of sleeves for cylinders of internal combustion engines | |
| CH586094A5 (en) | Light grinding or milling machine with automatic loading - has twin heads with headstock alternating between them as loading arm operates | |
| CA1179141A (en) | Stationary grinding wheel dressing unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE ES FR GB IT LI SE |
|
| 17P | Request for examination filed |
Effective date: 19910703 |
|
| 17Q | First examination report despatched |
Effective date: 19921116 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19930327 |