EP0669188B1 - Dispositif de centrage et de blocage d'une pièce en vue de son rodage à l'aide d'un rodoir à expansion - Google Patents
Dispositif de centrage et de blocage d'une pièce en vue de son rodage à l'aide d'un rodoir à expansion Download PDFInfo
- Publication number
- EP0669188B1 EP0669188B1 EP95400391A EP95400391A EP0669188B1 EP 0669188 B1 EP0669188 B1 EP 0669188B1 EP 95400391 A EP95400391 A EP 95400391A EP 95400391 A EP95400391 A EP 95400391A EP 0669188 B1 EP0669188 B1 EP 0669188B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- component
- lapping
- fluid
- sense
- 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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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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
-
- 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
- B24B33/10—Accessories
Definitions
- the present invention relates to a centering device and clamping of a part with a view to lapping it using a expansion, including a support by which the lapping part is applied against a fixed stop, and a set of two fluid pistons acting on said support.
- Another known centering and clamping device designed specially for lapping pinions includes a fixed stop against which the lapping pinion is applied directly by a support on which acts a set of concentric fluid pistons.
- This set includes a first fluid piston having a large stroke relative to its cylinder, and a second fluid piston interposed between the support and the first piston and having a reduced stroke with respect to this latest.
- the stroke of the first piston is fixed and is chosen so only when the first piston is in full travel in the direction in advance and the second piston at full travel in the reverse direction, it There remains, between the pinion and the support and / or the fixed stop, a slight lower clearance at the stroke of the second piston.
- the pinion being angularly immobilized by an anti-rotation system, we then engage in the pinion the lapping driven in rotation and the lapping is expanded until the establishment of a predetermined braking torque between the lapping and the pinion, indicating that the abrasive stones of the lapping being in contact with the pinion bore, the latter is centered relative to the lapping.
- the second piston is then fed into the direction of advance so that the pinion thus centered is clamped by the support against the fixed stop for its running-in.
- This known device while offering advantages over to the cassette device (less wearing parts, possibility of making coincide the pinion-support and pinion-stop contact surfaces with reference surfaces recessed on the pinion), nevertheless presents the drawback that the stroke of the first piston is fixed and predetermined, so that with each pass of a pinion having a thickness axial given to a pinion having another axial thickness, it is necessary also to change the stopper to replace it with a stopper having a complementary axial dimension.
- the present invention relates to a centering and clamping device of a part with a view to running in with an expansion lapping, device which, while being simple in structure, can be used without modification for lapping parts with different axial thicknesses.
- step c) the supply of fluid to the second piston in the reverse direction according to step c) is effected through the first piston, in which case step c) also includes the supply of fluid to the first piston in the reverse direction.
- this blocking element is constituted by a fluid clamping sleeve, of a type known per se.
- a pinion 1 whose bore must be run in is brought by means not shown, on a support surface 2, below a stop 3 installed in a fixed position, at a distance above from surface 2, on a support 3a.
- the support 3a and the stop 3 are crossed by a passage hole for the introduction, from the top, an expansion lapping 4 in the bore of the pinion 1.
- This device comprises a cylinder 6 in which is vertically movable back and forth a first piston 7 itself serving as a guide for a second piston 8 extended upwards by a rod 8a which carries, via a spherical bearing 9, a support piece 10 for the pinion 1 to be lapped.
- the support piece 10 which is hollowed out in its upper part to be able receive the lower end of lapping 4 is mobile, under the action of the two pistons 7 and 8, in a hole 11 in the support surface 2, to lift and clamp the pinion 1 against the stopper 3.
- a fluid clamping sleeve 12 is fixed in the cylinder 6, around a rod 7a which extends the piston 7 downwards beyond cylinder 6 at its lower part.
- the first piston 7 can be supplied with pressurized fluid in the direction of advance, on its underside by a connector 13 and in the direction of recoil on its upper face by a fitting 14 on the cylinder 6.
- the second piston 8 can be supplied with pressurized fluid in the direction of advance, on its underside by a connector 15 provided on the rod 7a and in the backward direction on its upper face by a passage 16 provided in the piston 7 and communicating with the fitting supply 14 of the latter.
- the clamping sleeve 12 can be supplied with fluid by a fitting 17 on cylinder 6.
- the support 3a carries a finger 18 protruding downwards to serve as an anti-rotation element for the pinion 1, as described in more detail below.
- the device 5 is shown in the position of rest, the two pistons 7 and 8 being in the backward position (position lower) and the clamping sleeve 12 being loosened.
- pressurized fluid fittings 13 and 15 to move the two pistons 7 and 8 in the direction in advance (upwards), i.e. the piston 8 at full travel in the direction of advance and the piston 7 in the direction of advance until the clamping of the pinion 1 by the support piece 10 against the stopper 3.
- the finger 18 of the support 3a of the stop 3 automatically engages with pinion teeth 1 and prevents rotation of the latter.
- the clamping sleeve is fed 12 in pressurized fluid through its connector 17, so that the sleeve 12 blocks the piston rod 7a 8a in its position relative to the cylinder 6.
- the fluid supply is reversed under pressure of the first piston 7 and the second piston 8, putting pressurized connection 15 and pressurized connection 14 and, by Consequently, the passage 16 which communicates with the fitting 14.
- the first piston 7 blocked by the adapter sleeve 12 does not change position, while the second piston 8 is thus brought to the bottom of travel in reverse direction (down). Therefore, the support piece 10 drops from the value of the stroke of the second piston 8 and thus debrides the pinion 1 while holding it in engagement with the finger 18.
- a fourth step we introduce from the top, through the support 3a and the stop 3, the expansion lapping 4 in the bore pinion 1 and, while rotating the lapping, we expand the latter so that its running-in stones come into contact with the bore of pinion 1 to be lapped.
- This expansion continues until that a predetermined torque is measured, by a torque detector, between lapping 4 and pinion 1 angularly immobilized by the finger 18.
- the detection of this couple is the sign that the pinion 1 is perfectly centered on the lap.
- a fifth step we reverse the feed again of the second piston 8, by pressurizing its connector 15, so that the piston 8 is brought back to the bottom in the opposite direction in advance (upwards) and re-clamps against the stop 3 the pinion 1 beforehand centered by lapping 4.
- the actual lapping of the pinion 1 can then be carried out by lapping 4, the device 5 remaining in the same position.
- the stroke of the second piston 8 can be very short (of the order 0.5 mm) since this piston has the unique function of allowing, after clamping of the pinion, an unclamping of the pinion for centering of the latter by lapping 4 and, then, a re-clamping of the pinion after centering by lapping 4.
- the first piston 7 must on the other hand have a sufficient stroke to allow the clamping, against the same fixed stop 3, of all sprockets 1 to run in, i.e. compensation for differences of axial thickness that these pinions 1 can have between their two opposite reference surfaces coming into contact with one fixed stop 3 and the other with the movable support piece 10 of the device 5.
- the anti-rotation finger 18 is a fixed part, not ordered, which is not requested during running-in properly said, the pinion then being immobilized angularly by its blocking against the stopper 3.
- the hydraulic control 19 of the device 5 includes three subsets 20, 21 and 22.
- the subset 20 piston 7 forward / backward, connected to fittings 13 and 14, control the advance and retreat of the piston 7 (and the retreat of the piston 8) and includes a 4/3 solenoid valve (four ports, three positions) a regulator pressure and two flow limiters (non-return valves with throttles).
- the sub-assembly 21 for advancing the piston 8, connected to the connector 15, controls the advance of the piston 8 and includes a 4/2 solenoid valve (four holes including one plugged, two positions), a regulator pressure and a flow limiter.
- the hydraulic control 19 of the device 5 is completed by an electronic control 23 which controls the progress sequences as described above, involving a measurement of the torque on lapping 4 (detector element 24) to define the end of the pinion centering cycle 1.
- This torque measurement can be done, for example, by measuring the current absorbed by the motor electric lapping drive, or in any other way known per se.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Description
Claims (5)
- Dispositif de centrage et de bridage d'une pièce (1) en vue de son rodage à l'aide d'un rodoir à expansion (4), comprenant un appui (10) par lequel la pièce (1) à roder est appliquée contre une butée fixe (3), un ensemble de deux pistons à fluide concentriques (7,8) agissant sur ledit appui (10), ledit ensemble étant composé dun premier piston (7) à grande course et d'un second piston (8) à course réduite intercalé entre ledit appui (10) et le premier piston (7), et des moyens anti-rotation (18) pour immobiliser angulairement la pièce à roder, caractérisé par le fait qu'il comprend, en outre, un élément de blocage (12) pour bloquer à volonté le premier piston (7) par rapport à son cylindre (6), et une commande adaptée pour, successivement,a) - alimenter les deux pistons (7,8) en fluide dans le sens d'avance de manière à brider la pièce (1) par l'appui (10) contre la butée (3), le second piston (8) étant à fond de course dans le sens d'avance,b) - bloquer le premier piston (7) dans sa position par rapport à son cylindre (6) par l'élément de blocage (12)c) - inverser l'alimentation du second piston (8) pour l'amener à fond de course dans le sens de recul et débrider la pièce (1),d) - introduire le rodoir (4) dans la pièce (1) immobilisée angulairement par les moyens anti-rotation (18) et, en l'entraínant en rotation, faire expanser le rodoir (4) jusqu'à l'établissement d'un couple prédéterminé entre le rodoir et la pièce (1) qui se trouve ainsi centrée, ete) - inverser de nouveau l'alimentation du second piston (8) pour ramener ce dernier à fond de course dans le sens d'avance et rebrider contre la butée (3) la pièce (1) ainsi centrée.
- Dispositif suivant la revendication 1, caractérisé par le fait que la commande est adaptée pour permettre, à la suite de l'étape e), def) alimenter le premier piston (7) dans le sens d'avance et débloquer l'élément de blocage (12) jusqu'à la fin de l'opération de rodage de la pièce.
- Dispositif suivant la revendication 1, caractérisé par le fait que l'alimentation en fluide du second piston (8) dans le sens de recul se fait par l'alimentation en fluide du premier piston (7) dans le sens de recul.
- Dispositif suivant l'une quelconque des revendications précédentes, caractérisé par le fait que l'élément de blocage du premier piston (7) est constitué par un manchon de serrage (13) à fluide fixé au cylindre (6) du premier piston (7).
- Dispositif suivant l'une quelconque des revendications précédentes pour le rodage de pignons, caractérisé par le fait que les moyens anti-rotation (18) sont constitués par un élément (18) fixe coopérant avec la denture du pignon (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9402256A FR2716640B1 (fr) | 1994-02-28 | 1994-02-28 | Dispositif de centrage et de blocage d'une pièce en vue de son rodage à l'aide d'un rodoir à expansion. |
| FR9402256 | 1994-02-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0669188A1 EP0669188A1 (fr) | 1995-08-30 |
| EP0669188B1 true EP0669188B1 (fr) | 1999-01-13 |
Family
ID=9460488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95400391A Expired - Lifetime EP0669188B1 (fr) | 1994-02-28 | 1995-02-24 | Dispositif de centrage et de blocage d'une pièce en vue de son rodage à l'aide d'un rodoir à expansion |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5667425A (fr) |
| EP (1) | EP0669188B1 (fr) |
| DE (1) | DE69507173T2 (fr) |
| ES (1) | ES2125568T3 (fr) |
| FR (1) | FR2716640B1 (fr) |
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| US2535199A (en) * | 1947-05-28 | 1950-12-26 | Bryant Grinder Corp | Gear holding diaphragm chuck |
| US3029562A (en) * | 1959-08-12 | 1962-04-17 | Emerson Electric Mfg Co | Stator bore honing machine and method of honing |
| US3552069A (en) * | 1967-08-04 | 1971-01-05 | Nat Automatic Tool Co | Floating seat structure for honing machines and the like |
| US3557492A (en) * | 1969-06-25 | 1971-01-26 | Barnes Drill Co | Clamping fixture for a machine tool |
| JPS5145036Y2 (fr) * | 1972-10-19 | 1976-11-01 | ||
| DE2903622C3 (de) * | 1979-01-31 | 1994-11-17 | Gehring Gmbh & Co Maschf | Vorrichtung zum Halten von Werkstücken, insbesondere von Zahnrädern |
| DE3125188C3 (de) * | 1981-06-26 | 1995-06-14 | Gehring Gmbh & Co Maschf | Vorrichtung zum Halten von Werkstücken |
| FR2541613B3 (fr) * | 1983-02-25 | 1985-12-06 | Gehring Gmbh Maschf | Dispositif pour tenir des pieces a usiner, notamment des roues dentees aux fins de glacage de l'alesage axial central |
-
1994
- 1994-02-28 FR FR9402256A patent/FR2716640B1/fr not_active Expired - Fee Related
-
1995
- 1995-02-23 US US08/393,537 patent/US5667425A/en not_active Expired - Fee Related
- 1995-02-24 ES ES95400391T patent/ES2125568T3/es not_active Expired - Lifetime
- 1995-02-24 DE DE69507173T patent/DE69507173T2/de not_active Expired - Fee Related
- 1995-02-24 EP EP95400391A patent/EP0669188B1/fr not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US5667425A (en) | 1997-09-16 |
| DE69507173D1 (de) | 1999-02-25 |
| FR2716640A1 (fr) | 1995-09-01 |
| DE69507173T2 (de) | 1999-09-16 |
| ES2125568T3 (es) | 1999-03-01 |
| FR2716640B1 (fr) | 1996-05-03 |
| EP0669188A1 (fr) | 1995-08-30 |
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