US20160256974A1 - Honing machine for bearing rings and method for feeding such a machine with bearing rings - Google Patents
Honing machine for bearing rings and method for feeding such a machine with bearing rings Download PDFInfo
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- US20160256974A1 US20160256974A1 US15/016,482 US201615016482A US2016256974A1 US 20160256974 A1 US20160256974 A1 US 20160256974A1 US 201615016482 A US201615016482 A US 201615016482A US 2016256974 A1 US2016256974 A1 US 2016256974A1
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- honing
- pin
- bearing ring
- damper
- work piece
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- 230000007246 mechanism Effects 0.000 claims description 22
- 230000005484 gravity Effects 0.000 claims description 9
- 238000013016 damping Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 229910003460 diamond Inorganic materials 0.000 claims description 4
- 239000010432 diamond Substances 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 description 21
- 239000004575 stone Substances 0.000 description 5
- 238000007689 inspection Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 229920002994 synthetic fiber Polymers 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 2
- 239000004149 tartrazine Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 230000003993 interaction Effects 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
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- 238000005096 rolling process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Classifications
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- 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
- B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
- B24B19/06—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements for grinding races, e.g. roller races
-
- 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
-
- 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
- This invention relates to a honing machine which can be used for a honing process on bearing rings. This invention also relates to a method for feeding a honing machine with bearing rings.
- a honing machine provided with a honing tool or “honing stone” which is brought into contact with a raceway of a bearing ring, in order to improve its finish.
- each bearing ring is held in a honing station and driven in rotation with respect to the honing tool which remains stationary.
- a bearing ring present in the honing station must be supported by a work piece holder which is generally provided with pads mounted on a concave surface which is shaped according to the dimensions of the bearing rings to be processed in the honing machine.
- the pads are used to precisely center each bearing ring with respect to a rotation axis of a rotatable member which drives the bearing ring in rotation with respect to the honing stone. Thus, it is essential that the pads are correctly positioned with respect to the rotation axis.
- pads made of a hard material are difficult to use, since there exists a risk of breakage of the pads, upon the impact of a ring entering the honing station.
- An alternative consists in using relatively soft pads, such as pads made of a synthetic material. A drawback of this approach is that such pads tend to wear off, so that they do not allow a precise positioning of the bearing rings with respect to the rotation axis.
- a bearing manufacturer generally offers a range of bearings whose inner and outer rings have different dimensions.
- bearing rings with different dimensions have to be successively processed on a honing machine.
- the work piece holder When it is needed to switch the honing machine from a configuration where it handles a first type of bearing rings to another configuration where it handles a second type of rings, the work piece holder has to be changed and carefully positioned with respect to a frame of the honing machine. Because of the limitations of the current work piece holders, such an operation implies that a dummy bearing ring must be located in the honing station and manually centered on the rotation axis in order to be used as a reference for the pads of a new work piece holder to be installed in the honing station. This complicated setting operation is time consuming and requires a highly qualified manpower.
- the present invention aims at solving these problems with a new honing machine having a work piece holder which can be provided with hard and long-lasting pads, with a low breakage risk.
- the invention concerns a honing machine for bearing rings, this machine including a frame, a honing tool, a honing station for holding a bearing ring in position with respect to the honing tool, the honing station including a work piece holder with a concave surface equipped with at least one pad for supporting a bearing ring.
- the work piece holder is equipped with a damper movable between a first active configuration, where it protrudes on a path of a bearing ring moving towards the work piece holder in the honing station, and a second passive configuration, where it is out of reach of a bearing ring in the honing station.
- the damper is capable of preventing a direct impact between a bearing ring entering the honing station and the pads of the work piece holder. Since the pads are not subjected to a large number of impacts, they can be made in a hard material, which allows them not to wear off as quickly as pads made of a synthetic material. Since the pads do not wear off, their dimensions remain constant and the work piece holder can be installed within the honing station without having to use a dummy bearing ring.
- such a honing machine can incorporate one or several of the following features:
- the invention also concerns a method for feeding a honing station of a honing machine as described here-above.
- a method for feeding a honing station of a honing machine as described here-above includes at least the following steps consisting in:
- the damper of the honing machine includes a pin movable in translation along a vertical direction as mentioned here-above, it can be provided that, during step c), an upper surface of the pin is moved downwardly by gravity up to a level where it is below an upper surface of an adjacent pad of the work piece holder.
- FIG. 1 is a partial perspective view of a honing machine according to the invention in a loading configuration
- FIG. 2 is a perspective view similar to FIG. 1 , when the honing machine is in a honing configuration;
- FIG. 3 is a perspective view of a first transfer box, which belongs to a transfer mechanism of the honing machine of FIG. 1 ;
- FIG. 4 is a perspective view of a second transfer box, which belongs to the same transfer mechanism
- FIG. 5 is a partial front view of the machine of FIGS. 1 and 2 , where some parts are omitted, for the sake of clarity;
- FIG. 6 is a front view similar to FIG. 5 , at a smaller scale and where some side panels have been removed in order to show the bearing rings in the transfer mechanism;
- FIG. 7 is a front view similar to FIG. 6 where, for the sake of clarity only two bearing rings are represented in the machine, which is in the configuration of FIGS. 5 and 6 ;
- FIGS. 8, 9, 10, 11, 12, 13, and 14 are front views similar to FIG. 6 when the transfer mechanism of the honing machine is in successive configurations;
- FIG. 15 is an enlarged detailed view of a work piece holder of the machine of FIGS. 1 to 14 , when this work piece holder is in the configuration of FIG. 13 ;
- FIG. 16 is a perspective view of the work piece holder in the configuration of FIG. 15 ;
- FIG. 17 is an enlarged view, similar to FIG. 15 when the work piece holder is in the configuration of FIG. 14 ;
- FIG. 18 is a perspective view of the work piece holder in the configuration of FIG. 17 , in a direction close to the one of FIG. 16 ;
- FIG. 19 is a perspective view of the work piece holder, in the configuration of FIGS. 17 and 18 , in another direction.
- the honing machine 2 represented on FIGS. 1 to 19 includes a base frame 4 which supports a fixed pole 6 .
- a honing stone 8 is supported by an arm 10 which extends upwardly from fixed bracket 6 .
- Honing machine 2 also includes a movable frame 12 slidable, with respect to base frame 4 , along a fixed longitudinal axis X 4 , in two opposite directions, as shown by double arrow A 1 .
- a non-represented actuator such as an electric motor or a pneumatic or hydraulic cylinder, drives movable frame 12 in translation along axis X 4 .
- Movable frame 12 supports a honing station 14 where a bearing ring 100 is held in position for interaction with the honing stone 8 . More precisely, movable frame 12 supports a rotary actuator, in the form of an electric motor 16 , which is adapted to drive bearing ring 100 present in holding station 14 around a rotation axis X 14 which is fixed with respect to frame 12 and parallel to axis X 4 . Movable frame 12 supports a holding mechanism 17 provided with two rollers 172 adapted to come into contact with a lateral surface of bearing ring and to push this ring towards electric motor 16 , in order to make a friction type connection between bearing ring 100 and a rotating member 162 driven by motor 16 in rotation around axis X 14 .
- holding mechanism 17 is movable with respect to frame 12 , in translation along an axis X 17 parallel to axes X 4 and X 14 , between a loading configuration of honing machine 2 represented on FIG. 1 and a honing configuration represented on FIG. 2 .
- rollers 172 do not contact bearing ring 100 whereas, in the configuration of FIG. 2 , rollers 172 push bearing ring 100 against rotating member 162 .
- Honing station 14 includes, amongst others, a work piece holder 18 which has a concave surface 182 , with a section perpendicular to axis X 14 in the form of an arc of a circle centered on axis X 14 .
- This work piece holder is selected in order to match the outer dimensions of bearing rings to be processed by honing machine 2 .
- work piece holder is generally changed when a new type of bearing rings is to be processed in honing machine 2 .
- Honing machine 2 also includes a transfer mechanism 20 which is used to successively feed honing station 14 with bearing rings stored in an inlet chute 22 .
- Transfer mechanism 20 includes a first transfer box 202 and a second transfer box 204 which is located immediately below the first transfer box.
- the words “below”, “above”, “inferior” or “superior” relate to a working configuration of honing machine 2 .
- “Above” or “superior” relates a surface or a part which is oriented towards the top of machine 2 in such a configuration
- “below” or “inferior” relates to a surface or a part which is oriented to the bottom of this machine.
- First transfer box 202 is visible alone on FIG. 3 and includes a first metallic side wall 2020 and a second metallic side wall 2022 .
- Two spacers 2024 and 2026 made of a synthetic material are interposed between side walls 2020 and 2022 , so that an inside volume V 202 of first transfer box 202 is defined between side walls 2020 and 2022 .
- An inspection window 2028 is provided on side wall 2022 and allows checking the content of volume V 202 through side wall 2022 .
- Spacer 2024 extends on the whole height of side walls 2020 and 2022 and protrudes downwardly with respect to these two walls.
- Spacer 2026 extends between lower parts of side walls 2020 and 2022 , so that an inlet opening 202 A is defined on the lateral side of box 202 visible on FIG. 2 .
- This inlet opening 202 A allows introduction of a bearing ring within volume V 202 .
- an outlet bottom opening 202 B is defined between the lower edges of side walls 2020 and 2022 and between spacers 2024 and 2026 .
- Reference character 2026 A denotes the upper surface of spacer 2026 . This upper surface 2026 A is inclined towards outlet opening 202 B. In other words, this surface lowers in the direction of outlet opening 202 B.
- Reference characters 2024 B and 2026 B respectively denote the vertical surfaces of spacers 2024 and 2026 which face each other. In the direction of axis Y 202 , outlet opening 202 B is defined between surfaces 2024 B and 2026 B. Reference character D 2 denotes the distance measured between surfaces 2024 B and 2026 B along axis Y 202 .
- Second transfer box 204 also includes two metallic side walls 2040 and 2042 and two synthetic spacers 2044 and 2046 .
- An inspection window 2048 is provided in side wall 2042 and allows inspection of the inside volume V 204 of second transfer box 204 .
- An inlet opening 204 A of second transfer box 204 is defined between the top edges of side walls 2040 and 2042 .
- An outlet opening 204 B of second transfer box 204 is defined between spacers 2044 and 2046 , below the respective central portions of the lower edges of side walls 2040 and 2042 .
- Reference character 2046 A denotes the upper surface of spacer 2046 . This surface is horizontal.
- Reference character 2046 B denotes an end face of spacer 2046 oriented towards spacer 2044 .
- Outlet opening 204 B is defined, along axis Y 204 , between spacer 2044 and end face 2046 B.
- inlet opening 204 A is vertically aligned with outlet opening 202 B, so that a bearing ring can go from volume V 202 into inside volume V 204 by gravity.
- Transfer mechanism 20 also includes a first pneumatic cylinder 206 mounted on frame 12 and adapted to drive first transfer box 202 in translation along an axis Y 202 which is horizontal and perpendicular to axis X 4 .
- Double arrow A 2 represents the to-and-fro movements of first transfer box 202 in the direction of axis Y 202 .
- Cylinder 206 is a rodless cylinder whose output member is connected to first transfer box 202 .
- a second pneumatic cylinder 208 is mounted on movable frame 12 and its output member is connected to second transfer box 204 and drives this box in translation along a second axis Y 204 which is parallel to axis Y 202 .
- Double arrow A 4 shows the to-and-fro movements of second transfer box 204 along axis Y 204 .
- Honing machine 2 also includes an inlet chute 22 and an outlet chute 24 .
- bearing rings go from inlet chute 22 to outlet chute 24 via transfer mechanism 20 and honing station 14 .
- Outlet chute 24 is provided with a side wall 242 and an inductive sensor 244 which allows detecting the presence of a bearing ring in an inside volume V 24 of chute 24 , when the ring lies or rolls on a lower surface 246 of outlet chute 24 .
- FIGS. 6 to 14 For the sake of clarity, side walls 2022 , 2042 and 242 are omitted on FIGS. 6 to 14 , in order to show inside volumes V 202 , V 204 and V 24 and their content.
- An inlet gate 26 is arranged between inlet chute 22 and transfer mechanism 20 and this inlet gate is controlled by a pneumatic cylinder 28 .
- cylinders 206 , 208 and 28 respectively form actuators for items 202 , 204 and 26 .
- other types of actuators can be used, for instance hydraulic cylinders, mechanical jacks or electric motors.
- work piece holder 18 is equipped with two pads 184 and 186 whose outer or exposed surfaces, respectively 184 A and 196 A, slightly protrude with respect to concave surface 182 , by a few tenth of millimeters, so as to make sure that each bearing ring will touch only the pads and thereby be accurately positioned.
- Pad 184 is located in the lower part of honing station 14 , below bearing ring 100 present in this station.
- Pad 184 is substantially aligned, along a vertical direction, with axis X 14 .
- Pad 186 is located on a side of honing station 14 , actually on the same side as inlet chute 22 , roughly at the same height as axis X 14 .
- the shape of work piece holder 18 in particular the radius of curvature of concave surface 182 and the location of pads 184 and 186 depend on the geometry of the bearing rings to be processed in honing machine 2 .
- each pad 184 or 186 A of each pad 184 or 186 is advantageously formed of a layer of polycrystalline diamond or “PCD”, which presents a high mechanical stiffness.
- This high stiffness layer has a thickness between 1 and 500 ⁇ m and is applied on an armature 184 B or 86 B made for instance of carbide, with a thickness between 0.1 and 10 mm, preferably equal to about 0.2 mm.
- armature 184 B or 186 B and the high stiffness layer can be made in other materials with suitable mechanical properties to resist wear, shocks and lower the variation of dimensions with temperature and time.
- the thickness of the high stiffness layers forming surfaces 184 A and 186 A is exaggerated, in order to show these layers more easily.
- a through hole 188 is provided on work piece holder 18 and extends vertically and downwardly from a stepped portion 182 A of concave surface 182 .
- Through hole 188 is visible on FIG. 15 via a local cutaway of work piece holder 18 , which is metallic.
- Z 188 denotes the central axis of through hole 188 .
- a metallic pin 190 is slidably mounted within through hole 188 and movable along axis Z 188 between a first position, represented on FIGS. 15 and 16 , and a second position, represented on FIGS. 17 to 19 .
- Pin 190 has an upper head 192 with an upper surface 192 A adapted to be in contact with a lower portion of the outer radial surface of bearing ring 100 present in honing station 14 , as explained here-under.
- Pin 190 also has a lower sole 194 which defines a peripheral shoulder 196 around the main portion of pin 190 .
- a coil spring 280 is mounted around pin 190 , between shoulder 196 and a lower surface 183 of work piece holder 18 .
- pin 190 when pin 190 is in its first position, its head 192 protrudes upwardly with respect to surface 184 A of pad 184 . Thus, head 192 of pin 190 is on the path of a bearing ring falling towards work piece holder 18 .
- upper surface 192 A of head 192 when pin 190 is in its second position, upper surface 192 A of head 192 does not protrude above surface 184 A. In this position, surface 192 A is slightly below surface 184 A, so that a bearing ring lying on work piece holder 18 does not contact pin 190 . In other words, in this second position, pin 190 is out of reach of a ring present in honing station 14 .
- a shaft 30 is mounted on movable frame 12 next to work piece holder 18 and its longitudinal axis Y 30 is parallel to axes Y 202 and Y 204 .
- shaft 30 is rotatably supported by movable frame 12 , so that it can rotate around axis Y 30 between a first position, represented on FIGS. 15 and 16 , and a second position, represented on FIGS. 17 to 19 .
- a first end 302 of shaft 30 is equipped with a paddle 304 which extends radially with respect to axis Y 30 , so that it is located directly below sole 194 in the configuration of FIGS. 15 and 16 . More precisely, in this configuration, sole 194 lies against an upper surface 306 of paddle 304 .
- the second end 308 of shaft 30 which is opposite to first end 302 , is connected to a rocker arm 310 .
- the end of rocker arm 310 opposite to shaft 30 is connected to an output rod 320 of a gas cylinder 32 .
- gas cylinder 32 forms an actuator which allows pivoting shaft 30 , in rotation around axis Y 30 , between the position of FIGS. 15 and 16 , on the one hand, and the position of FIGS. 17 to 19 , on the other hand.
- Gas cylinder 32 can also be used to dampen a rotation movement of shaft 30 around axis Y 30 , in the direction of arrow R 1 on FIG. 16 , as explained here-below.
- a non-represented pneumatic control unit is connected to cylinders 206 , 208 , 28 and 32 and pilots these actuators, according to a predetermined sequence, which is explained here-below.
- Feeding of honing station 14 is now explained in connection to FIGS. 5 to 19 .
- FIG. 6 shows two bearing rings 102 in transfer mechanism 20 but, for the sake of clarity, only one bearing ring 102 is represented on FIGS. 7 to 14 .
- the configuration of honing machine 2 is the same on FIGS. 6 and 7 .
- bearing ring 100 is present in honing station 14 and centered on axis X 14 , in front of rotary member 162 .
- Inlet gate 26 has been opened by cylinder 28 and bearing ring 102 enters inside volume V 202 of first transfer box 202 via inlet opening 202 A.
- bearing ring 102 rolls on upper surface 2026 A of spacer 2026 and falls within inside volume V 204 of second transfer box 204 via outlet opening 202 B of box 202 and inlet opening 204 A of box 204 .
- bearing ring 102 goes, by gravity, from inside volume V 202 into inside volume V 204 .
- inside volume V 202 of first transfer box 202 accommodates bearing ring 102 until it falls down into inside volume V 204 of second transfer box 204 .
- volume V 204 accommodates most of bearing ring 102 , but a top part of the ring remains in volume V 202 .
- bearing ring 102 is blocked within volume V 204 , and actually protrudes upwardly into volume V 202 since ring 102 lies on the upper surface 2046 A of spacer 2046 .
- space 2046 works as a platform for supporting bearing ring 102 within volume V 204 .
- ring 102 is located, along axis Y 202 , between spacers 2024 and 2026 . More precisely, transfer box 202 is designed so that distance D 2 is slightly larger than the outside diameter of ring 102 .
- ring 102 is guided between vertical surfaces 2024 B and 2026 B. In this configuration, bearing ring 102 does not interfere with bearing ring 100 because the opening defined between spacers 2024 and 2046 is not large enough for ring 102 to move downwardly by gravity.
- second transfer box 204 is moved along axis Y 204 by cylinder 208 , in the direction of arrows A 8 and A 9 on FIGS. 8 and 9 , so that it reaches the position of FIG. 9 .
- its bottom outlet opening 204 B is laterally offset from honing station 14 .
- bearing ring 100 Due to the movement of second transfer box 204 between the configuration of FIG. 8 and the configuration of FIG. 9 , bearing ring 100 is ejected from honing station 14 by the end face 2046 B of spacer 2046 . Then, ring 200 falls within the inside volume V 24 of outlet chute 24 . During the movement of second transfer box 204 in the direction of arrows A 8 and A 9 , bearing ring 102 rolls on upper surface 2046 A of platform or spacer 2046 .
- Cylinder 206 is piloted in a next step in order to move first transfer box 202 along axis Y 202 in the same direction as second transfer box 204 has been moved previously, as shown by arrow A 10 on FIG. 10 . Because of the translation movement of first transfer box 202 , spacer 2026 works as a pusher for pushing bearing ring 102 in the same direction, towards spacer 2044 , within inside volume V 204 and along axis Y 204 . On this occasion, bearing ring 102 rolls on surface 2046 A.
- first transfer box 202 goes on up to a point where outlet opening 202 B is vertically aligned with honing station 14 , along a vertical axis Z 14 which crosses axis X 14 , as shown on FIGS. 10 and 11 .
- This movement of first transfer box 202 results in moving bearing ring 102 towards bottom outlet opening 204 B.
- the platform formed by spacer 2046 temporary holds bearing ring 102 within inside volume V 204 , from the configuration of FIG. 8 to the configuration of FIG. 11 .
- bearing ring 100 rolls on surface 246 within chute 24 and passes in front of inductive sensor 244 , so that the ejection of bearing ring 100 from rolling station 14 is automatically detected.
- second transfer box 204 is moved along axis Y 204 in the opposite direction, as shown by arrow A 12 on FIG. 2 that is in a direction opposite to the movement of first transfer box 202 in the previous step.
- paddle 304 lies on the downward vertical path of sole 194 when pin 190 moves from its first position to its second position. Because of the biasing effort of spring 280 , sole 194 is in contact with paddle 304 as long as shaft 30 remains in its first angular position. In the second angular position of shaft 30 , paddle 304 is out of reach of sole 194 , so that shaft 30 does not interact with pin 190 which is only subjected to its weight and to the action of spring 280 . Thus, pin 190 automatically reaches its second position where surface 192 A is below surface 184 A.
- Spring 280 pushes sole 194 away from surface 183 , so that head 192 comes into contact with surface portion 182 A, to the point that head 192 does not protrude upwardly with respect to surface 184 A of pad 184 , as explained here-above.
- ring 102 reaches the configuration of FIG. 14 where it is centered on axis X 14 within honing station 14 .
- centering of ring 102 with respect to axis X 14 is obtained via pads 184 and 186 which are precisely positioned with respect to frame 12 and can withstand a large number of operations because of their structural hardness.
- ring 102 is ready for being pushed by holding mechanism 17 against rotating member 162 , so that it can be driven in rotation around axis X 14 by electric motor 16 once movable frame 12 has been moved along axis X 4 in order to align, along axis X 4 , the inner radial surface of ring 102 , now present in honing station 14 , with honing stone 8 .
- gas cylinder 32 actuates rocker arm 310 to bring shaft 30 back to its first position, which brings pin 190 back to its position of FIGS. 12 to 16 .
- inspection windows 2028 and 2048 allow checking the position of bearing ring 102 in transfer mechanism 20 .
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Abstract
A honing machine for bearing rings includes a frame, a honing tool, a honing station for holding a bearing ring in position with respect to the honing tool, the honing station includes a work piece holder with a concave surface equipped with at least one pad for supporting a bearing ring. The work piece holder is equipped with a damper movable between a first active configuration and a second passive configuration. In the first active configuration, the damper protrudes on a path of a bearing ring moving towards the work piece holder in the honing station. In the second passive configuration, the damper is out of reach of a bearing ring in the honing station.
Description
- This is a Non-Provisional Patent Application, filed under the Paris Convention, claiming the benefit of Europe (EP) Patent Application Number 15305316.0, filed on 2 Mar. 2015 (02.03.2015), which is incorporated herein by reference in its entirety.
- This invention relates to a honing machine which can be used for a honing process on bearing rings. This invention also relates to a method for feeding a honing machine with bearing rings.
- In the field of bearings manufacturing, it is known to use a honing machine provided with a honing tool or “honing stone” which is brought into contact with a raceway of a bearing ring, in order to improve its finish. During a honing process, each bearing ring is held in a honing station and driven in rotation with respect to the honing tool which remains stationary. A bearing ring present in the honing station must be supported by a work piece holder which is generally provided with pads mounted on a concave surface which is shaped according to the dimensions of the bearing rings to be processed in the honing machine. The pads are used to precisely center each bearing ring with respect to a rotation axis of a rotatable member which drives the bearing ring in rotation with respect to the honing stone. Thus, it is essential that the pads are correctly positioned with respect to the rotation axis.
- When the honing station is fed by gravity with bearing rings, pads made of a hard material are difficult to use, since there exists a risk of breakage of the pads, upon the impact of a ring entering the honing station. An alternative consists in using relatively soft pads, such as pads made of a synthetic material. A drawback of this approach is that such pads tend to wear off, so that they do not allow a precise positioning of the bearing rings with respect to the rotation axis.
- Moreover, a bearing manufacturer generally offers a range of bearings whose inner and outer rings have different dimensions. Thus, bearing rings with different dimensions have to be successively processed on a honing machine. When it is needed to switch the honing machine from a configuration where it handles a first type of bearing rings to another configuration where it handles a second type of rings, the work piece holder has to be changed and carefully positioned with respect to a frame of the honing machine. Because of the limitations of the current work piece holders, such an operation implies that a dummy bearing ring must be located in the honing station and manually centered on the rotation axis in order to be used as a reference for the pads of a new work piece holder to be installed in the honing station. This complicated setting operation is time consuming and requires a highly qualified manpower.
- The present invention aims at solving these problems with a new honing machine having a work piece holder which can be provided with hard and long-lasting pads, with a low breakage risk.
- To this end, the invention concerns a honing machine for bearing rings, this machine including a frame, a honing tool, a honing station for holding a bearing ring in position with respect to the honing tool, the honing station including a work piece holder with a concave surface equipped with at least one pad for supporting a bearing ring. According to the invention, the work piece holder is equipped with a damper movable between a first active configuration, where it protrudes on a path of a bearing ring moving towards the work piece holder in the honing station, and a second passive configuration, where it is out of reach of a bearing ring in the honing station.
- Thanks to the invention, the damper is capable of preventing a direct impact between a bearing ring entering the honing station and the pads of the work piece holder. Since the pads are not subjected to a large number of impacts, they can be made in a hard material, which allows them not to wear off as quickly as pads made of a synthetic material. Since the pads do not wear off, their dimensions remain constant and the work piece holder can be installed within the honing station without having to use a dummy bearing ring.
- According to further aspects of the invention which are advantageous but not compulsory, such a honing machine can incorporate one or several of the following features:
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- Each pad of the work piece holder is coated with a high stiffness material, in particular with a layer of polycrystalline diamond.
- The damper includes a pin, which is movable in translation along a vertical axis, and damping means for braking a vertical downward displacement of the pin.
- The pin is movable along the vertical axis between a first position, where it protrudes upwardly with respect to an adjacent pad of the work piece holder, and a second position, where an upper surface of the pin is below an upper surface of the adjacent pad.
- The damping means include a rotatable shaft movable in rotation around its longitudinal axis, between a first angular position where it interacts with a vertical downward movement of the pin between its first and second positions and a second angular position where the shaft is out of reach of the pin, and a gas cylinder for moving the shaft between its first and second positions, and reverse.
- The shaft is provided with a paddle which lies on the downward path of the pin between its first and second positions, when the shaft is in its first angular position, and which is away from the downward path, when the rotating shaft is in its second angular position.
- The paddle is secured to a first end of the shaft and the gas cylinder is connected by a rocker arm to a second end, opposite to the first end, of the shaft.
- The honing machine includes elastic means for biasing the pin downwardly.
- The elastic means bias the pin against the paddle when the rotating shaft is in its first angular position.
- The elastic means is a coil spring mounted around the pin and compressed between a lower surface of the work piece holder and a peripheral shoulder of the pin.
- The work piece is provided with a vertical through hole and the pin is slidably movable inside the vertical through hole.
- The pin has an upper head for receiving an outer surface of a bearing ring, the concave surface of the work piece holder has a stepped portion, which is below an exposed surface of an adjacent pad and the upper head of the pin is accommodated above the stepped portion of the upper surface of the work piece holder and at a level below the upper surface of the adjacent pad when the damper is in its second passive configuration.
- The honing machine includes a transfer mechanism for feeding the honing station with bearing rings, one after the other, the transfer mechanism including a first transfer box, adapted to accommodate a bearing ring and movable in translation, in a to-and-fro movement with respect to the frame, along a first axis, a second transfer box, adapted to accommodate a bearing ring and movable in translation, in a to-and-fro movement with respect to the frame, along a second axis parallel to the first axis, first driving means for driving the first transfer box in translation along the first axis and second driving means for driving the second transfer box in translation along the second axis, in such a way that the second transfer box is located under and adjacent the first transfer box, above the honing station, and that the second transfer box has a top inlet opening which is vertically aligned with a bottom outlet opening of the first transfer box.
- The invention also concerns a method for feeding a honing station of a honing machine as described here-above. Such a method includes at least the following steps consisting in:
-
- a) setting the damper in its first active configuration
- b) introducing the bearing ring by gravity into the honing station up to a point where it contacts the damper
- c) setting the damper in its second passive configuration
- Moreover, when the damper of the honing machine includes a pin movable in translation along a vertical direction as mentioned here-above, it can be provided that, during step c), an upper surface of the pin is moved downwardly by gravity up to a level where it is below an upper surface of an adjacent pad of the work piece holder.
- The invention will be better understood on the basis of the following description which is given in correspondence with the annexed figures and as an illustrative example, without restricting the object of the invention. In the annexed figures:
-
FIG. 1 is a partial perspective view of a honing machine according to the invention in a loading configuration; -
FIG. 2 is a perspective view similar toFIG. 1 , when the honing machine is in a honing configuration; -
FIG. 3 is a perspective view of a first transfer box, which belongs to a transfer mechanism of the honing machine ofFIG. 1 ; -
FIG. 4 is a perspective view of a second transfer box, which belongs to the same transfer mechanism; -
FIG. 5 is a partial front view of the machine ofFIGS. 1 and 2 , where some parts are omitted, for the sake of clarity; -
FIG. 6 is a front view similar toFIG. 5 , at a smaller scale and where some side panels have been removed in order to show the bearing rings in the transfer mechanism; -
FIG. 7 is a front view similar toFIG. 6 where, for the sake of clarity only two bearing rings are represented in the machine, which is in the configuration ofFIGS. 5 and 6 ; -
FIGS. 8, 9, 10, 11, 12, 13, and 14 are front views similar toFIG. 6 when the transfer mechanism of the honing machine is in successive configurations; -
FIG. 15 is an enlarged detailed view of a work piece holder of the machine ofFIGS. 1 to 14 , when this work piece holder is in the configuration ofFIG. 13 ; -
FIG. 16 is a perspective view of the work piece holder in the configuration ofFIG. 15 ; -
FIG. 17 is an enlarged view, similar toFIG. 15 when the work piece holder is in the configuration ofFIG. 14 ; -
FIG. 18 is a perspective view of the work piece holder in the configuration ofFIG. 17 , in a direction close to the one ofFIG. 16 ; and -
FIG. 19 is a perspective view of the work piece holder, in the configuration ofFIGS. 17 and 18 , in another direction. - The
honing machine 2 represented onFIGS. 1 to 19 includes a base frame 4 which supports afixed pole 6. Ahoning stone 8 is supported by anarm 10 which extends upwardly fromfixed bracket 6. -
Honing machine 2 also includes amovable frame 12 slidable, with respect to base frame 4, along a fixed longitudinal axis X4, in two opposite directions, as shown by double arrow A1. A non-represented actuator, such as an electric motor or a pneumatic or hydraulic cylinder, drivesmovable frame 12 in translation along axis X4. -
Movable frame 12 supports a honingstation 14 where abearing ring 100 is held in position for interaction with the honingstone 8. More precisely,movable frame 12 supports a rotary actuator, in the form of anelectric motor 16, which is adapted to drive bearingring 100 present in holdingstation 14 around a rotation axis X14 which is fixed with respect to frame 12 and parallel to axis X4.Movable frame 12 supports aholding mechanism 17 provided with tworollers 172 adapted to come into contact with a lateral surface of bearing ring and to push this ring towardselectric motor 16, in order to make a friction type connection between bearingring 100 and a rotatingmember 162 driven bymotor 16 in rotation around axis X14. Actually, holdingmechanism 17 is movable with respect to frame 12, in translation along an axis X17 parallel to axes X4 and X14, between a loading configuration of honingmachine 2 represented onFIG. 1 and a honing configuration represented onFIG. 2 . In the configuration ofFIG. 1 ,rollers 172 do not contactbearing ring 100 whereas, in the configuration ofFIG. 2 ,rollers 172push bearing ring 100 against rotatingmember 162. - In the following description, unless otherwise specified, one considers honing
machine 2 in its loading configuration. For the sake of clarity, items 4 to 10 and 17 are omitted onFIGS. 5 to 14 . - Honing
station 14 includes, amongst others, awork piece holder 18 which has aconcave surface 182, with a section perpendicular to axis X14 in the form of an arc of a circle centered on axis X14. This work piece holder is selected in order to match the outer dimensions of bearing rings to be processed by honingmachine 2. Thus, work piece holder is generally changed when a new type of bearing rings is to be processed in honingmachine 2. - Honing
machine 2 also includes atransfer mechanism 20 which is used to successively feed honingstation 14 with bearing rings stored in aninlet chute 22. -
Transfer mechanism 20 includes afirst transfer box 202 and asecond transfer box 204 which is located immediately below the first transfer box. - In the present description, the words “below”, “above”, “inferior” or “superior” relate to a working configuration of honing
machine 2. “Above” or “superior” relates a surface or a part which is oriented towards the top ofmachine 2 in such a configuration, whereas “below” or “inferior” relates to a surface or a part which is oriented to the bottom of this machine. -
First transfer box 202 is visible alone onFIG. 3 and includes a firstmetallic side wall 2020 and a secondmetallic side wall 2022. Twospacers side walls first transfer box 202 is defined betweenside walls inspection window 2028 is provided onside wall 2022 and allows checking the content of volume V202 throughside wall 2022. -
Spacer 2024 extends on the whole height ofside walls Spacer 2026 extends between lower parts ofside walls inlet opening 202A is defined on the lateral side ofbox 202 visible onFIG. 2 . This inlet opening 202A allows introduction of a bearing ring within volume V202. Moreover, an outlet bottom opening 202B is defined between the lower edges ofside walls spacers -
Reference character 2026A denotes the upper surface ofspacer 2026. Thisupper surface 2026A is inclined towards outlet opening 202B. In other words, this surface lowers in the direction of outlet opening 202B. - Reference characters 2024B and 2026B respectively denote the vertical surfaces of
spacers -
Second transfer box 204 also includes twometallic side walls synthetic spacers inspection window 2048 is provided inside wall 2042 and allows inspection of the inside volume V204 ofsecond transfer box 204. An inlet opening 204A ofsecond transfer box 204 is defined between the top edges ofside walls second transfer box 204 is defined betweenspacers side walls -
Reference character 2046A denotes the upper surface ofspacer 2046. This surface is horizontal. - Reference character 2046B denotes an end face of spacer 2046 oriented towards
spacer 2044. Outlet opening 204B is defined, along axis Y204, betweenspacer 2044 and end face 2046B. - In working configurations of
transfer mechanism 20,inlet opening 204A is vertically aligned with outlet opening 202B, so that a bearing ring can go from volume V202 into inside volume V204 by gravity. -
Transfer mechanism 20 also includes a firstpneumatic cylinder 206 mounted onframe 12 and adapted to drivefirst transfer box 202 in translation along an axis Y202 which is horizontal and perpendicular to axis X4. Double arrow A2 represents the to-and-fro movements offirst transfer box 202 in the direction of axis Y202.Cylinder 206 is a rodless cylinder whose output member is connected tofirst transfer box 202. - A second
pneumatic cylinder 208 is mounted onmovable frame 12 and its output member is connected tosecond transfer box 204 and drives this box in translation along a second axis Y204 which is parallel to axis Y202. Double arrow A4 shows the to-and-fro movements ofsecond transfer box 204 along axis Y204. - Honing
machine 2 also includes aninlet chute 22 and anoutlet chute 24. Inmachine 2, bearing rings go frominlet chute 22 tooutlet chute 24 viatransfer mechanism 20 and honingstation 14. -
Outlet chute 24 is provided with aside wall 242 and aninductive sensor 244 which allows detecting the presence of a bearing ring in an inside volume V24 ofchute 24, when the ring lies or rolls on alower surface 246 ofoutlet chute 24. - For the sake of clarity,
side walls FIGS. 6 to 14 , in order to show inside volumes V202, V204 and V24 and their content. - An
inlet gate 26 is arranged betweeninlet chute 22 andtransfer mechanism 20 and this inlet gate is controlled by apneumatic cylinder 28. - In this example,
cylinders items - As shown on
FIGS. 15 to 19 ,work piece holder 18 is equipped with twopads concave surface 182, by a few tenth of millimeters, so as to make sure that each bearing ring will touch only the pads and thereby be accurately positioned.Pad 184 is located in the lower part of honingstation 14, below bearingring 100 present in this station.Pad 184 is substantially aligned, along a vertical direction, with axis X14.Pad 186 is located on a side of honingstation 14, actually on the same side asinlet chute 22, roughly at the same height as axis X14. The shape ofwork piece holder 18, in particular the radius of curvature ofconcave surface 182 and the location ofpads machine 2. - The exposed
surface pad FIGS. 15 and 17 , the thickness of the high stiffnesslayers forming surfaces - A through
hole 188 is provided onwork piece holder 18 and extends vertically and downwardly from a steppedportion 182A ofconcave surface 182. Throughhole 188 is visible onFIG. 15 via a local cutaway ofwork piece holder 18, which is metallic. - Z188 denotes the central axis of through
hole 188. Ametallic pin 190 is slidably mounted within throughhole 188 and movable along axis Z188 between a first position, represented onFIGS. 15 and 16 , and a second position, represented onFIGS. 17 to 19 .Pin 190 has anupper head 192 with anupper surface 192A adapted to be in contact with a lower portion of the outer radial surface of bearingring 100 present in honingstation 14, as explained here-under. Pin 190 also has a lower sole 194 which defines aperipheral shoulder 196 around the main portion ofpin 190. Acoil spring 280 is mounted aroundpin 190, betweenshoulder 196 and alower surface 183 ofwork piece holder 18. - As shown on
FIGS. 15 and 16 , whenpin 190 is in its first position, itshead 192 protrudes upwardly with respect tosurface 184A ofpad 184. Thus,head 192 ofpin 190 is on the path of a bearing ring falling towardswork piece holder 18. As shown onFIGS. 17 to 19 , whenpin 190 is in its second position,upper surface 192A ofhead 192 does not protrude abovesurface 184A. In this position,surface 192A is slightly belowsurface 184A, so that a bearing ring lying onwork piece holder 18 does not contactpin 190. In other words, in this second position, pin 190 is out of reach of a ring present in honingstation 14. - A
shaft 30 is mounted onmovable frame 12 next to workpiece holder 18 and its longitudinal axis Y30 is parallel to axes Y202 and Y204. Actually,shaft 30 is rotatably supported bymovable frame 12, so that it can rotate around axis Y30 between a first position, represented onFIGS. 15 and 16 , and a second position, represented onFIGS. 17 to 19 . - A
first end 302 ofshaft 30 is equipped with apaddle 304 which extends radially with respect to axis Y30, so that it is located directly below sole 194 in the configuration ofFIGS. 15 and 16 . More precisely, in this configuration, sole 194 lies against anupper surface 306 ofpaddle 304. - The
second end 308 ofshaft 30, which is opposite tofirst end 302, is connected to arocker arm 310. The end ofrocker arm 310 opposite toshaft 30 is connected to anoutput rod 320 of agas cylinder 32. Thus,gas cylinder 32 forms an actuator which allows pivotingshaft 30, in rotation around axis Y30, between the position ofFIGS. 15 and 16 , on the one hand, and the position ofFIGS. 17 to 19 , on the other hand.Gas cylinder 32 can also be used to dampen a rotation movement ofshaft 30 around axis Y30, in the direction of arrow R1 onFIG. 16 , as explained here-below. - A non-represented pneumatic control unit is connected to
cylinders - Feeding of honing
station 14 is now explained in connection toFIGS. 5 to 19 . - On these figures, a bearing ring present in honing
station 14 is referenced 100, whereas a bearing ring to be fed to honingstation 14 is referenced 102.FIG. 6 shows two bearingrings 102 intransfer mechanism 20 but, for the sake of clarity, only onebearing ring 102 is represented onFIGS. 7 to 14 . The configuration of honingmachine 2 is the same onFIGS. 6 and 7 . In this configuration, bearingring 100 is present in honingstation 14 and centered on axis X14, in front ofrotary member 162.Inlet gate 26 has been opened bycylinder 28 andbearing ring 102 enters inside volume V202 offirst transfer box 202 viainlet opening 202A. In this configuration, bearingring 102 rolls onupper surface 2026A ofspacer 2026 and falls within inside volume V204 ofsecond transfer box 204 via outlet opening 202B ofbox 202 and inlet opening 204A ofbox 204. In other words, and as shown by arrow A7 onFIG. 7 and by the comparison ofFIGS. 7 and 8 , bearingring 102 goes, by gravity, from inside volume V202 into inside volume V204. - Thus, inside volume V202 of
first transfer box 202 accommodates bearingring 102 until it falls down into inside volume V204 ofsecond transfer box 204. In the configuration ofFIG. 8 , and actually also in the configuration ofFIGS. 9 to 12 , volume V204 accommodates most ofbearing ring 102, but a top part of the ring remains in volume V202. - In the configuration of
FIG. 8 , bearingring 102 is blocked within volume V204, and actually protrudes upwardly into volume V202 sincering 102 lies on theupper surface 2046A ofspacer 2046. Thus,space 2046 works as a platform for supportingbearing ring 102 within volume V204. Moreover,ring 102 is located, along axis Y202, betweenspacers transfer box 202 is designed so that distance D2 is slightly larger than the outside diameter ofring 102. Thus, in the configuration ofFIG. 8 ,ring 102 is guided between vertical surfaces 2024B and 2026B. In this configuration, bearingring 102 does not interfere with bearingring 100 because the opening defined betweenspacers ring 102 to move downwardly by gravity. - From the configuration of
FIG. 8 ,second transfer box 204 is moved along axis Y204 bycylinder 208, in the direction of arrows A8 and A9 onFIGS. 8 and 9 , so that it reaches the position ofFIG. 9 . In this position ofsecond transfer box 204, its bottom outlet opening 204B is laterally offset from honingstation 14. - Due to the movement of
second transfer box 204 between the configuration ofFIG. 8 and the configuration ofFIG. 9 , bearingring 100 is ejected from honingstation 14 by the end face 2046B ofspacer 2046. Then, ring 200 falls within the inside volume V24 ofoutlet chute 24. During the movement ofsecond transfer box 204 in the direction of arrows A8 and A9, bearingring 102 rolls onupper surface 2046A of platform orspacer 2046. -
Cylinder 206 is piloted in a next step in order to movefirst transfer box 202 along axis Y202 in the same direction assecond transfer box 204 has been moved previously, as shown by arrow A10 onFIG. 10 . Because of the translation movement offirst transfer box 202, spacer 2026 works as a pusher for pushingbearing ring 102 in the same direction, towardsspacer 2044, within inside volume V204 and along axis Y204. On this occasion, bearingring 102 rolls onsurface 2046A. This movement offirst transfer box 202 goes on up to a point where outlet opening 202B is vertically aligned with honingstation 14, along a vertical axis Z14 which crosses axis X14, as shown onFIGS. 10 and 11 . This movement offirst transfer box 202 results in movingbearing ring 102 towards bottom outlet opening 204B. - The platform formed by
spacer 2046 temporary holds bearingring 102 within inside volume V204, from the configuration ofFIG. 8 to the configuration ofFIG. 11 . - As shown on
FIGS. 10 and 11 , bearingring 100 rolls onsurface 246 withinchute 24 and passes in front ofinductive sensor 244, so that the ejection of bearingring 100 from rollingstation 14 is automatically detected. - Once this detection has occurred, it is sure that no bearing ring remains in honing
station 14, so that this honing station can be loaded again with bearingring 102. To this end,second transfer box 204 is moved along axis Y204 in the opposite direction, as shown by arrow A12 onFIG. 2 that is in a direction opposite to the movement offirst transfer box 202 in the previous step. This bringstransfer mechanism 20 in a configuration whereoutlet openings second transfer boxes station 14. This is the configuration represented onFIG. 12 . - From this configuration and because of gravity,
ring 102 falls into honingstation 14, as shown by arrow A13 onFIGS. 12 and 13 . In other words, bearingring 102 follows a vertical downward path or trajectory, from volume V204 to honingstation 14, this path being shown by arrow A13 onFIGS. 12 and 13 . - The downward movement of
ring 10 is dampened bypin 190, which protrudes upwardly frompad 184 on the downward path of bearingring 102, sincework piece holder 18 is in the configuration ofFIGS. 15 and 16 . When bearingring 102 reaches head 192 ofpin 190, it exerts a downward effort E102, as represented onFIGS. 15 and 16 , which is transmitted bypin 190 to paddle 304 and tends to rotateshaft 30 around axis Y30, in the direction of rotation arrow R1. This rotation movement ofshaft 30 around its longitudinal axis is transmitted byrocker arm 310 torod 320 ofgas cylinder 32. In other words, effort E102 is transmitted as a pulling effort E′102 onrod 32, this pulling effort being dampened or slowed by the gas pressure withincylinder 32. Thus,shaft 30 andgas cylinder 32 work as braking means forpin 190, when it goes from its position ofFIGS. 15 and 16 to a lower position. - Once this dampening or braking effect of the downward movement of
ring 102 has been obtained with the damper formed ofpin 190,shaft 30 andcylinder 32,cylinder 32 is actuated to pushrod 320 outwardly, so thatrocker arm 310 andshaft 30 are brought into the configuration ofFIGS. 16 to 19 wherepaddle 304 is offset frompin 190. In other words,shaft 30 is brought bygas cylinder 32 androcket arm 310 from a first angular position with respect to axis Y30 to a second angular position. In the first angular position ofshaft 30,paddle 304 is in contact with sole 194, so thatpaddle 304 interacts with the downward movement ofpin 190 going from its first position to its second position. More precisely, whenshaft 30 is in its first angular position, paddle 304 lies on the downward vertical path of sole 194 whenpin 190 moves from its first position to its second position. Because of the biasing effort ofspring 280, sole 194 is in contact withpaddle 304 as long asshaft 30 remains in its first angular position. In the second angular position ofshaft 30,paddle 304 is out of reach of sole 194, so thatshaft 30 does not interact withpin 190 which is only subjected to its weight and to the action ofspring 280. Thus, pin 190 automatically reaches its second position wheresurface 192A is belowsurface 184A.Spring 280 pushes sole 194 away fromsurface 183, so thathead 192 comes into contact withsurface portion 182A, to the point that head 192 does not protrude upwardly with respect tosurface 184A ofpad 184, as explained here-above. - Then ring 102 reaches the configuration of
FIG. 14 where it is centered on axis X14 within honingstation 14. In this configuration, centering ofring 102 with respect to axis X14 is obtained viapads - In other words, thanks to the use of
pin 190,shaft 30 andgas cylinder 32, it is possible to usehigh resistance pads pads ring 102. - In the configuration of
FIG. 14 ,ring 102 is ready for being pushed by holdingmechanism 17 against rotatingmember 162, so that it can be driven in rotation around axis X14 byelectric motor 16 oncemovable frame 12 has been moved along axis X4 in order to align, along axis X4, the inner radial surface ofring 102, now present in honingstation 14, with honingstone 8. - At a later stage, which corresponds to the configuration of
FIG. 11 , that is when a bearing ring has just been ejected from honingstation 14,gas cylinder 32 actuatesrocker arm 310 to bringshaft 30 back to its first position, which bringspin 190 back to its position ofFIGS. 12 to 16 . - Throughout the process described here-above,
inspection windows ring 102 intransfer mechanism 20.
Claims (16)
1. A honing machine for bearing rings, this machine including:
a frame;
a honing tool;
a honing station for holding a bearing ring in position with respect to the honing tool, the honing station including a work piece holder with a concave surface equipped with at least one pad for supporting a bearing ring; and
a damper, the damper being movable between a first active configuration and a second passive configuration,
where, in the first active configuration, the damper protrudes on a path of a bearing ring moving towards the work piece holder in the honing station,
where, in the second active configuration, the damper is out of reach of a bearing ring in the honing station.
2. The honing machine according to claim 1 , wherein each pad of the work piece holder is coated with a high stiffness material, in particular with a layer of polycrystalline diamond.
3. The honing machine according to claim 1 , wherein each pad of the work piece holder is coated with a layer of polycrystalline diamond.
4. The honing machine according to claim 1 , the damper further including a pin and a damping feature,
wherein the pin is movable in translation along a vertical axis,
wherein the damping component is adapted for braking a vertical downward displacement of the pin.
5. The honing machine according to claim 4 , the work piece further comprising a vertical through hole,
wherein the pin is slidably movable inside the vertical through hole.
6. The honing machine according to claim 4 ,
the pin further comprising an upper head, wherein the upper head is adapted to receive an outer surface of a bearing ring; and
the concave surface of the work piece holder further comprising a stepped portion, wherein the stepped portion is located below an exposed surface of an adjacent pad;
wherein the upper head of the pin is accommodated above the stepped portion of the upper surface of the work piece holder and at a level below the upper surface of the adjacent pad, when the damper is in its second passive configuration.
7. The honing machine according to claim 4 , wherein the pin is movable along the vertical axis between a first position and a second position,
wherein, in the first position, the pin protrudes upwardly with respect to an adjacent pad of the work piece holder,
wherein, in the second position, an upper surface of the pin is positioned below an upper surface of the adjacent pad.
8. The honing machine according to claim 7 , the damping feature further including:
a rotatable shaft movable in rotation around its longitudinal axis, between a first angular position where it interacts with a vertical downward movement of the pin, between its first and second positions, and a second angular position where the shaft is out of reach of the pin; and
a gas cylinder for moving the shaft between a first position of the shaft and a second position of the shaft, and reverse.
9. The honing machine according to claim 8 , the shaft further comprising a paddle,
wherein the paddle lies on the downward path of the pin between a first position of the paddle and a second position of the paddle, when the shaft is in a first shaft angular position, and which is away from the downward path, when the rotating shaft is in its second angular position.
10. The honing machine according to claim 9 , wherein the paddle is secured to a first end of the shaft and the gas cylinder is connected by a rocker arm to a second end, opposite to the first end, of the shaft.
11. The honing machine according to claim 8 , further comprising an elastic element for biasing the pin downwardly.
12. The honing machine according to claim 11 , wherein the elastic element biases the pin against the paddle when the rotating shaft is in its first angular position.
13. The honing machine according to claim 11 , wherein the elastic element is a coil spring,
wherein the coil spring is mounted around the pin and compressed between a lower surface of the work piece holder and a peripheral shoulder of the pin.
14. The honing machine according to claim 1 , further comprising a transfer mechanism for feeding the honing station with bearing rings, one after the other, the transfer mechanism including:
a first transfer box, adapted to accommodate a bearing ring and movable in translation, in a to-and-fro movement with respect to the frame, along a first axis,
the first transfer box including a bottom outlet opening,
a second transfer box, adapted to accommodate a bearing ring and movable in translation, in a to-and-fro movement with respect to the frame, along a second axis, the second axis being parallel to the first axis,
the second transfer box including a top inlet opening,
a first driving mechanism for driving the first transfer box in translation along the first axis and
a second driving mechanism for driving the second transfer box in translation along the axis direction,
wherein the second transfer box is located under and adjacent the first transfer box, above the honing station, and that the second transfer box has a top inlet opening which is vertically aligned with a bottom outlet opening of the first transfer box.
15. A method for feeding a honing station of a honing machine with a bearing ring, the honing machine comprising:
a frame;
a honing tool;
a honing station for holding a bearing ring in position with respect to the honing tool, the honing station including a work piece holder with a concave surface equipped with at least one pad for supporting a bearing ring; and
a damper, the damper being movable between a first active configuration and a second passive configuration,
wherein, in the first active configuration, the damper protrudes on a path of a bearing ring moving towards the work piece holder in the honing station,
wherein, in the second active configuration, the damper is out of reach of a bearing ring in the honing station, the method comprising steps of:
a) setting the damper in a damper first active configuration;
b) introducing the bearing ring by gravity into the honing station up to a point where the bearing ring contacts the damper; and
c) setting the damper in its second passive configuration.
16. The method according to claim 15 , the damper further including a pin and a damping feature,
wherein the pin is movable in translation along a vertical axis,
wherein the damping component is adapted for braking a vertical downward displacement of the pin,
during the step of setting the damper in its second passive configuration, the method further comprising a step of moving an upper portion of the pin downwardly by gravity up to a level where it is below an exposed surface of an adjacent pad of the work piece holder.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15305316.0 | 2015-03-02 | ||
EP15305316.0A EP3064316A1 (en) | 2015-03-02 | 2015-03-02 | Honing machine for bearing rings and method for feeding such a machine with bearing rings |
Publications (1)
Publication Number | Publication Date |
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US20160256974A1 true US20160256974A1 (en) | 2016-09-08 |
Family
ID=52684172
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US15/016,482 Abandoned US20160256974A1 (en) | 2015-03-02 | 2016-02-05 | Honing machine for bearing rings and method for feeding such a machine with bearing rings |
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US (1) | US20160256974A1 (en) |
EP (1) | EP3064316A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114800009A (en) * | 2022-04-12 | 2022-07-29 | 银川金沃精工科技有限公司 | Bearing outer ring overturning, detecting and removing device, turning production line and machining method |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102146574B1 (en) * | 2020-03-20 | 2020-08-20 | 심조원 | Innerring grinding equipment |
CN117798722B (en) * | 2024-02-29 | 2024-05-28 | 江苏帝蒙德轴承有限公司 | Rolling bearing ring processingequipment |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3339312A (en) * | 1964-05-18 | 1967-09-05 | Fafnir Bearing Co | Honing apparatus |
DE1502051A1 (en) * | 1964-06-13 | 1969-06-04 | Zd Y Presneho Strojirenstvi Go | Trough-shaped drop magazine for round workpieces in automatic machine tools |
DE1577465A1 (en) * | 1966-01-08 | 1970-04-30 | ||
DE2326689B2 (en) * | 1973-05-25 | 1978-11-30 | Maschinenbau Grieshaber Gmbh & Co, 7620 Wolfach | Machine for fine machining of rotationally symmetrical workpieces |
US4136488A (en) * | 1977-08-29 | 1979-01-30 | Ex-Cell-O Corporation | Honing machine |
SU1237376A1 (en) * | 1984-05-23 | 1986-06-15 | Всесоюзный конструкторско-технологический институт строительного и дорожного машиностроения | Loading/unloading arrangement |
DE4005911C1 (en) * | 1990-02-24 | 1991-04-25 | Gmn Georg Mueller Nuernberg Ag, 8500 Nuernberg, De | |
CH701156B1 (en) * | 2006-12-28 | 2010-12-15 | Robotic Consulting S A R L | Grinding machine bearing rings. |
DE102010036470B4 (en) * | 2010-07-16 | 2018-04-26 | Thielenhaus Technologies Gmbh | Device for honing running surfaces on roller bearing rings |
-
2015
- 2015-03-02 EP EP15305316.0A patent/EP3064316A1/en not_active Withdrawn
-
2016
- 2016-02-05 US US15/016,482 patent/US20160256974A1/en not_active Abandoned
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114800009A (en) * | 2022-04-12 | 2022-07-29 | 银川金沃精工科技有限公司 | Bearing outer ring overturning, detecting and removing device, turning production line and machining method |
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