EP3283257B1 - Procédé et système de rectification extérieure d'éléments d'arbre entre des pointes - Google Patents

Procédé et système de rectification extérieure d'éléments d'arbre entre des pointes Download PDF

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Publication number
EP3283257B1
EP3283257B1 EP16715325.3A EP16715325A EP3283257B1 EP 3283257 B1 EP3283257 B1 EP 3283257B1 EP 16715325 A EP16715325 A EP 16715325A EP 3283257 B1 EP3283257 B1 EP 3283257B1
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EP
European Patent Office
Prior art keywords
supporting
grinding
shaft part
disc
support
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Application number
EP16715325.3A
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German (de)
English (en)
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EP3283257A1 (fr
Inventor
Erwin Junker
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Erwin Junker Grinding Technology AS
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Erwin Junker Grinding Technology AS
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Publication of EP3283257A1 publication Critical patent/EP3283257A1/fr
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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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/04—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally
    • 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
    • B24B41/067—Work supports, e.g. adjustable steadies radially supporting workpieces
    • 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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
    • B24B49/04—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent involving measurement of the workpiece at the place of grinding during grinding operation
    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/01—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor for combined grinding of surfaces of revolution and of adjacent plane surfaces on work
    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/18—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centreless means for supporting, guiding, floating or rotating work
    • B24B5/22—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centreless means for supporting, guiding, floating or rotating work for grinding cylindrical surfaces, e.g. on bolts

Definitions

  • the invention relates to a method for the external grinding of a shaft part with rotationally symmetrical sections and end faces having centering bores, and to a system comprising a grinding machine and such a shaft part.
  • a second basic grinding process is what is known as centerless grinding.
  • centerless grinding With centerless grinding, the workpiece is not held between centers; Rather, it is set in rotation by means of a grinding wheel and this opposite a regulating wheel for grinding or during grinding, with a so-called support ruler being provided under the workpiece in the grinding gap between the grinding wheel and the regulating wheel, on which the workpiece is supported during grinding .
  • a centerless grinding method of this type is particularly suitable for the external grinding of workpieces which are rotationally symmetrical or have rotationally symmetrical sections and are intended for mass production in large numbers.
  • the disadvantage of centerless grinding is that there is no longer any reference to centering with centerless grinding.
  • a cylindrical grinding machine for grinding between centers and for centerless grinding is described in the online article by mav.
  • the combination of grinding between centers and centerless grinding should lead to a significant reduction in processing time while at the same time increasing quality compared to grinding only between centers.
  • a predetermined material removal is first ground between the centers during grinding.
  • the clamping of the workpiece between the centers is released and then the centerless grinding process is carried out.
  • the workpiece is driven by the regulating wheel and is supported on each seat.
  • the centering points withdraw for the purpose of detaching the points from the workpiece, the workpiece is lowered onto the support rail arranged in the grinding gap.
  • the reference to the centering which is predetermined by the clamping between the centers, is retained or is only retained within small tolerances, since a reference change takes place during the grinding process.
  • the well-known Kronos L dual grinding machine uses both grinding processes, i.e. grinding between the centers and centerless grinding, on one machine.
  • the pre-grinding takes place between the tips, during which a clean, cylindrical outer surface is produced on the rotationally symmetrical sections.
  • the centers are loosened and centerless grinding follows.
  • centerless grinding this creates a new reference to what is known as the center, namely via the clean cylindrical surfaces of the rotationally symmetrical sections created during pre-grinding.
  • the grinding process is interrupted in any case after the pre-grinding and the subsequent release of the clamping between the centers when the center clamping on the workpiece is released. This is followed by the newly started centerless grinding. This means that the grinding time is increased in addition to the reference change of the reference longitudinal axis of the workpiece.
  • the disadvantage is that due to the clear technological separation between grinding between the centers and centerless grinding, the workpieces are not securely supported during grinding between the centers either by the support ruler or by the regulating wheel that is usually present in centerless grinding . Difficulties can therefore arise during grinding, particularly with long, thin shafts which are relatively flexible and unstable.
  • the object of the present invention is to provide a method for the external grinding of a shaft part having rotationally symmetrical sections and a system consisting of a grinding machine that implements the method and such a shaft part, by means of which the advantages of grinding between the centers, in particular the maintenance of an exact reference axis plays a role in grinding, can be used in order to be able to achieve a high quality of the grinding result on the ground workpiece, without additional steady rests having to be used even in the case of workpieces that have a certain flexibility with regard to their longitudinal axis.
  • the method according to the invention external grinding of a shaft part that has rotationally symmetrical sections and end faces in which centering bores are introduced is implemented.
  • the center bores define a reference longitudinal axis and axis of rotation of the shaft part, which must still be present after grinding for high accuracy of the shaft part or is of crucial importance for subsequent machining processes.
  • a measuring device records diameter values of the rotationally symmetrical sections of the shaft part. These measured values are transmitted to a control device, which the support device tracks the measured actual diameter values up to the finished size of the shaft part while continuously supporting the rotationally symmetrical sections.
  • the support device is preferably designed in the form of the first and the second support device as a support disc or a support ruler.
  • the main task of the support disk is that when grinding between the centers, support is provided on all parts of the shaft part where there are rotationally symmetrical sections.
  • the shaft part is located between the grinding wheel and the support disk, with the resulting grinding gap being closed at the bottom by a support ruler on which the shaft part is supported between the tips during grinding. This is how you find out Shaft part a support at least in the middle areas of its length, but always remains clamped between the tips during the entire grinding.
  • the shaft part is driven in rotation. This is preferably done by means of tips engaging in the centering bores or special drivers or a chuck that are adapted to the geometry of the workpiece.
  • the supporting disc is now designed in such a way that when it is placed against the shaft part, no slippage occurs between the supporting disc and the shaft part, i. This means that the support disk and the shaft part run essentially without slipping in relation to one another.
  • the grinding wheel, the shaft part and the support wheel are regulated with regard to their respective speed.
  • the speed control can be used to ensure that there is no slippage between the support disc and the shaft part, but on the other hand the grinding wheel creates optimal grinding engagement conditions on the shaft part.
  • the support disk is provided with a coating which is designed in the manner of a grinding wheel, the support disk being arranged opposite the grinding wheel and exercising its support function there, namely supporting the shaft part but not grinding.
  • a further embodiment is that the supporting disc is made of metal, for example steel or hard metal.
  • the supporting disc can be designed to be extremely wear-resistant.
  • the supporting device can track the currently measured diameter values up to the finished size of the shaft part
  • the diameter values are preferably measured by means of an in-process measurement.
  • the grinding process and thus the grinding result can be corrected immediately for each currently measured diameter.
  • the diameter is measured at at least one end of the shaft part.
  • the infeed value of the grinding wheel, the support wheel and the support fence are then controlled with this diameter measurement value.
  • the workpiece is usually measured at the diameters at both ends of the shaft. This makes it possible, on the one hand, to continuously measure the diameter of the workpiece at both ends of the shaft and thus also to determine the conicity deviation on the workpiece from the difference in the measured values.
  • the grinding wheel and the supporting wheel are designed in a preferred embodiment to be automatically pivotable with respect to their axes in the horizontal plane, each with CNC control.
  • this or the support ruler has infeed devices at both ends for infeed to the workpiece, so that the support ruler can be tilted to the central axis in a targeted manner by different infeed amounts. It is thus possible for the support ruler to be positioned exactly in line with the central axis of the workpiece or at an angle to the workpiece by means of different infeed amounts at the ends.
  • the support device has two support rulers which can be adjusted relative to one another and are designed in the form of a prism.
  • the two support rails represent the first support device and the second support device.
  • a method for the external grinding of a shaft part with rotationally symmetrical sections and with centerings attached to its end faces and defining a reference longitudinal axis and axis of rotation is implemented.
  • the method according to the invention according to this aspect of the invention ensures that during the grinding of the shaft part up to and including the end of the finish grinding, the shaft part ground with a grinding wheel is kept clamped between the centers gripping points, and at the same time both a support rail and a regulating wheel or a another support rail instead of the regulating wheel in constant engagement with the shaft part tracked to a respective current ground diameter.
  • the shaft part or workpiece is held between centers with the grinding wheel, at least during the substantial part of the grinding process.
  • a regulating wheel and a support rail basically corresponds to an arrangement for centerless grinding.
  • centerless grinding is not performed because the shaft member is kept tensioned between centers during grinding.
  • a regulating wheel and a support rail are provided in order to adequately support the shaft part during grinding on points. It is thus possible to achieve a high-precision grinding result even for relatively pliable or flexible workpieces without the provision of support rests.
  • the regulating wheel and the shaft part which is in particular driven in rotation, run essentially without slip relative to one another.
  • the slip-free operation ensures that the regulating wheel provides a reliable support function against the grinding forces introduced by the grinding wheel into the shaft part during grinding and that the regulating wheel cannot leave any surface markings, as is usually the case with support steady rests. Because the regulating wheel acts on exactly the points where grinding is to take place.
  • the grinding wheel, the shaft part and the regulating wheel are preferably speed-controlled. This allows optimal speed ratios to be set based on the grinding process.
  • the shaft part is driven by the grinding wheel and the regulating wheel during finish grinding, the grinding wheel and the regulating wheel forming a grinding gap in which the shaft part is arranged supported on the support rail.
  • This basic structure and the method implemented with it is similar to that in centerless grinding, with centerless grinding not taking place at all according to the invention.
  • the support rail and the additional support rail provided instead of the regulating wheel are adjusted relative to one another, with both support rails forming a prism which tracks the current ground diameter as a support device.
  • the respective current ground diameter of the rotationally symmetrical sections is preferably measured by means of an in-process measurement and is used in particular via a control device for controlling the tracking of the ground rotationally symmetrical section of the shaft part.
  • a control device for controlling the tracking of the ground rotationally symmetrical section of the shaft part.
  • the system according to the invention which consists of a grinding machine and a shaft part and is provided for the external grinding of the shaft part with rotationally symmetrical sections and end faces and centering bores introduced therein that define a reference longitudinal axis and axis of rotation of the shaft part, has a grinding spindle arranged on a CNC axis rotationally driven grinding wheel, a work headstock with a first tip and a tailstock with a second tip.
  • the shaft part is clamped or held by means of the first and the second tip during grinding and is driven to rotate about a reference longitudinal axis defined thereby.
  • the shaft part is permanently held or clamped during the entire grinding process.
  • a support device with a first and second support device that can be adjusted relative to one another and a measuring device for measuring current diameters of rotationally symmetrical sections of the shaft part are provided in the system according to the invention.
  • measurement signals from the current diameter of the rotationally symmetrical sections of the shaft part are forwarded to a control device or can be forwarded by this, whereby on the basis of these measured values the first and the second supporting device always correspond to the current diameter of the rotationally symmetrical section at which the current diameter is currently passing the measuring device has been determined, can be tracked in such a way that the shaft member is doubly supported by the support device opposed to the grinding wheel and with the tips engaged.
  • first and second support devices are not only always in contact with the respective rotationally symmetrical section of the shaft part, but the first and second support devices can track the current diameter of the respective rotationally symmetrical section.
  • tracking is to be understood as meaning that the respective support device is placed on the respective rotationally symmetrical section and is controlled in this regard in such a way that an optimal support function on the shaft part is ensured, but the support pressure is not so high that an high frictional resistance have a negative effect on the grinding forces to be applied or the grinding result as a whole.
  • friction-reducing surface coverings are arranged or provided on the supporting devices that support the workpiece over their length or that they are partially designed in such a way that only certain areas the support disc supports the workpiece.
  • the first supporting device is a supporting disc
  • the second supporting device is a support rule.
  • the support ruler is designed in such a way that it is basically used in centerless grinding.
  • the grinding wheel, the support wheel and the work headstock clamping the shaft part together with the tailstock each have an independent CNC drive, on the basis of which the respective speed can be regulated under CNC control.
  • the support disk is seated on a spindle and is preferably of divided design, with each part being able to track the current diameter of rotationally symmetrical sections of the shaft part while at the same time supporting these rotationally symmetrical sections.
  • both the first and the second supporting device are each a support ruler, which support rulers can be moved relative to one another when a prism-like support area is formed on the rotationally symmetrical section of the shaft part.
  • the measuring device is preferably designed as an in-process measuring device, by means of which current diameters can be measured while grinding is in progress.
  • FIG 1 the system according to the invention of the grinding machine and the shaft part or workpiece 10 is shown in a side view in a basic side view.
  • a grinding wheel 1 that can be advanced in the X1 direction is in engagement with the shaft part 10.
  • a support disk 2 that can be advanced along an X2 infeed axis onto the shaft part 10 and is in engagement with it.
  • the support disk 2 represents a first support device.
  • the shaft part 10 in turn is supported on a second support device in the form of a support ruler 3 .
  • the support ruler 3 can also be adjusted to the currently ground diameter of the shaft part 10 via a CNC axis. This means that the support ruler 3 can always be tracked to the currently ground diameter.
  • the grinding wheel 1 is mounted on a grinding spindle 4 (not shown), which is driven in rotation by a drive motor, also not shown.
  • the grinding spindle drive is equipped with a speed control, which is controlled by an in figure 1 for the sake of simplicity, also not shown CNC control of the grinding machine of the system according to the invention is controlled.
  • the infeed axes X1 for the grinding wheel 1 and X2 for the first supporting device designed as a supporting disk 2 are each designed as CNC axes.
  • the support disc 2 is placed on a support spindle 5 (not shown), which in turn is driven by a drive motor, also not shown, with speed control, the support spindle 5 being mounted on a support headstock (not shown), which is positioned along the CNC-controlled X2 axis shown. axis can be moved.
  • figure 2 shows the basic arrangement of the system according to the invention comprising the grinding machine and the shaft part in a viewing direction X according to FIG figure 1 dar.
  • the shaft part 10 is clamped between a tip 11 of a work headstock 13 and a tip 14 of a tailstock 15 .
  • the rotary entrainment of the shaft part 10 is effected by a driver 12.
  • the workpiece 10 remains clamped between the tips 11, 14 during the entire grinding process.
  • the tip 11 and the driver 12 of the work headstock 13 are driven by a CNC-controlled motor in rotation and with variable speed. After the shaft part 10 has been clamped between the tips 11, 14, the driver 12 ensures that the shaft part 10 is driven in rotation by means of a positive engagement.
  • the grinding wheel 1 of the grinding headstock as well as the supporting disks 2, 2' and the supporting ruler 3 are advanced via corresponding CNC-controlled axes.
  • Two support disks 2 , 2 ′ are arranged on the support spindle 5 and are placed on the shaft part 10 in its middle area, so that it is supported at two points between the tips 11 and 14 .
  • the support disks 2, 2' partially assume a support function in the central area on the shaft part 10, so to speak.
  • the regulating wheel in centerless grinding also takes on a driving or braking function for the workpiece during grinding in the solution according to the invention of the drive of the shaft part 10 via the drivers arranged on the workpiece spindle 13 .
  • the illustrated support function of the support disks 2, 2' ensures reliable grinding of the rotationally symmetrical sections with permanent clamping between the tips 11, 14, and specifically without the need for steady rests.
  • the support disks 2, 2' are in particular designed as low-wear disks made of hardened steel or hard metal.
  • the grinding spindle 4 with the grinding wheel 1 and the support spindle 5 with the support wheels 2, 2' are each on one Swivel axis mounted so that the spindles can be swiveled in a horizontal plane.
  • the respective pivoting movements or pivoting axes are identified by B1 or B2.
  • This procedure makes it possible to grind an exact cylindrical shape or a specific conicity on the workpiece.
  • This embodiment with the two pivot axes is a preferred, non-mandatory embodiment (not shown).
  • FIG 3 is a view along the section plane AA according to FIG figure 2 shown.
  • second support device not shown, is in figure 3 shown in the form of the support ruler 16.
  • This support or support ruler 16 designed as a support rail, has separate support areas 17, 17' and is adjusted by two CNC-controlled drives to the current, just ground diameter on the shaft part 10. During its clamping, the shaft part 10 partially rests between the tips 11, 14 on the support ruler 16 at its support regions 17, 17'.
  • the grinding headstock not shown, the support headstock also not shown, the workpiece headstock 13, the tailstock 15 and the support ruler or the support rail 16 with the drives 18, 19 are all mounted on a common machine bed 20.
  • At least An in-process diameter measuring head 21 is arranged at one of the two ends of the shaft part 10 .
  • In-process measuring heads 21, 22 are arranged on both shaft ends. With these measuring heads 21, 22, the respective current diameter of the shaft part can be continuously detected during grinding. The measured diameter values recorded in this way are transmitted to a machine controller (not shown). Based on these measured values, the machine control controls the support discs 2, 2' and the support ruler 16 continuously according to the current measured values on the shaft part 10, specifically during the entire grinding process until the finished size, ie the final size, is reached.
  • figure 4 is a view as per figure 3 shown, but with the difference that the driver 12 for the rotary drive of the shaft part 10 at in figure 4 finished loops shown are withdrawn.
  • the tips 11, 14 and the two support disks 2, 2' and the support ruler 16 remain permanently engaged on the shaft part 10, ie they touch the shaft part 10 and support it.
  • the drive does not take place via the workhead 13, but via the grinding wheel 1 (not shown) and the supporting discs 2, 2', with the shaft part 10 nevertheless remaining completely clamped between the centers 11, 14 during this phase.
  • the two measuring heads 21, 22 are in contact with the shaft part, so that the current shaft part diameter can be measured continuously during the process and, on the basis of these measured values for the respective current diameters, the support disks 2, 2' and the support ruler 16 can be continuously adjusted to the exact Target position can be employed.
  • the tips 11, 14 are only retracted for loading and unloading shaft parts or workpieces 10 from the grinding machine of the system according to the invention, namely along the displacement axes 23 or 24, so that a finish-ground shaft part 10 can be removed from the grinding machine.
  • the shaft part 10 is clamped between the centers 11, 14 during the entire grinding process, with the drivers 12 on the work headstock 13 ensuring that the shaft part 10 is driven in rotation during the grinding process.
  • two support disks 2, 2' are in turn arranged, which support the shaft part 10 in its middle region on the side opposite the grinding wheel engagement.
  • the shaft part 10 according to the embodiment figure 5 only one continuous, rotationally symmetrical section over the entire length of the shaft part is provided.
  • the shaft part 10 according to the embodiment figure 5 a waistband in its middle area.
  • This federal government also has flat surfaces 25, which are also ground with the grinding wheel.
  • the grinding wheel is divided into two partial grinding wheels 30, 30'.
  • the distance between the partial grinding wheels, both of which are arranged on the grinding spindle 4 is slightly greater than the width of the shoulder of the shaft part 10 that has the flat surfaces 25.
  • the partial grinding wheel 30 has an abrasive coating 31, whereas the partial grinding wheel 30' has an abrasive coating 32.
  • the partial grinding wheel 30 also has an abrasive coating on its end face, which points towards the partial grinding wheel 30 .
  • the grinding surface 33 provided there is used to grind the collar arranged in the middle region of the shaft part 10 with respect to its planar surface 25 .
  • the partial grinding wheel 30 ′ also has such a face side grinding coating, which is then arranged on the face side of the partial grinding wheel 30 ′ that points towards the partial grinding wheel 30 . So that the flat surface 25 can be ground on the collar of the shaft part 10, it is provided that the grinding wheel 30, 31 and the workpiece 10 or the shaft part 10 perform a relative movement to one another in the longitudinal direction of the shaft part 10.
  • the work headstock 13 with its tip 11 and the tailstock 15 with its tip 14 can be automatically moved axially under CNC control. This ensures that the shaft part 10 is axially infed with its flat side 25 against the grinding layer 33 of the partial grinding wheel 30 and the flat side 25 can thereby be ground.
  • the grinding of the face side takes place at least partially at the same time.
  • both the rotationally symmetrical peripheral sections as well as the Face 25 can be ground completely at the same time.
  • the grinding spindle 4 with its partial grinding wheels 30, 30' can also be displaced axially according to an embodiment that is not shown.
  • the axial displacement of the work headstock is effected by a CNC-controlled Z2 axis and the tailstock 15 by a likewise CNC-controlled Z1 axis.
  • CBN is the preferred coating for grinding the flat sides.
  • FIG 6 is in principle representation, which according to figure 1 corresponds to another embodiment shown.
  • the shaft part 10 is ground by the grinding wheel 1 again.
  • a support ruler 35 is provided, so that the shaft part 10 is reliably supported during grinding with permanent clamping between the centers by two support rulers, the support ruler 3 (second support device) and the support ruler 35 (first support device). is supported.
  • Both the support ruler 3 and the support ruler 35 can not only be set against the shaft part 10 via respective CNC-controlled infeed axes 36, 37, but can also be actively tracked to the current measured.
  • Both support rails 3, 35 are designed to be wear-resistant on their support surface, which is realized in particular by means of a PCD (polycrystalline diamond) coating.
  • the infeed or tracking of the support rails 3, 35 to the respective current diameter of the shaft part 10 takes place in dependence on one another, so that a reliable support of the workpiece 10 can be realized during the entire grinding process with permanent clamping between the centers.
  • Both support rulers 3, 35 form a V-shaped prism due to their mutually dependent adjustment or tracking to the current diameter of the shaft part 10.
  • the drivers 12 (not shown) must also engage in the workpiece in order to achieve the finished dimension in this exemplary embodiment, so that rotational entrainment of the shaft part 10 is ensured during the entire grinding process.
  • FIG 7 finally put one to the Figures 3 and 4 analog representation, which according to a view according to the section plane BB figure 6 indicates.
  • both support rulers 3, 35 each form a partial support for the shaft part 10.
  • the basic function, in which the tips 11, 14 clamp the workpiece during the entire grinding process, is also implemented in this exemplary embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Claims (18)

  1. Procédé de rectification extérieure d'un élément d'arbre (10) comprenant des parties à symétrie de révolution et des faces frontales, dans lesquelles des alésages de centrage sont ménagés, lesquels définissent un axe longitudinal de référence et un axe de rotation de l'élément d'arbre (10), dans lequel, pendant la rectification jusqu'à la fin de la rectification de finition au moyen d'une meule (1), l'élément d'arbre (10) est maintenu entre des pointes (11 ; 14) venant en prise dans les alésages de centrage et est supporté sur les parties à symétrie de révolution au moyen d'un équipement de support (2, 2' ; 3 ; 35) comprenant un premier et un deuxième dispositif de support, dans lequel l'élément d'arbre (10) est disposé entre la meule (1) et un premier dispositif de support (2, 2') de l'équipement de support (2, 2' ; 3, 35) et un dispositif de mesure est un dispositif de mesure en cours de fabrication (21) et mesure des valeurs de diamètre des parties à symétrie de révolution de l'élément d'arbre (10), transmet ces valeurs de mesure à un dispositif de commande et ce dispositif de commande, sur la base de ces valeurs de mesure, asservit activement le réglage de la meule (1) et l'équipement de support (2, 2' ; 3 ; 35), de manière à supporter en continu les parties à symétrie de révolution, aux valeurs de diamètre jusqu'à la dimension finie de l'élément d'arbre (10),
    caractérisé en ce que
    l'équipement de support (2, 2' ; 3 ; 35) présente un disque de support (2, 2') ou une règle d'appui (3 ; 35) comme premier dispositif de support et le deuxième dispositif de support présente une règle d'appui (3 ; 35) et au moyen du dispositif de commande, sur la base des valeurs de mesure, le disque de support (2, 2') et la règle d'appui (3 ; 35) ou les règles d'appui (3 ; 35), pendant la rectification, sont supportés de manière continue et permanente sur les parties à symétrie de révolution de l'élément d'arbre (10) entre les pointes (11, 14) et sont asservis à leurs valeurs de diamètre mesurées réelles.
  2. Procédé selon la revendication 1, caractérisé en ce que l'élément d'arbre (10) est entraîné en rotation.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'équipement de support (2, 2' ; 3 ; 35) présente le disque de support (2, 2') comme premier dispositif de support et le disque de support (2, 2') et l'élément d'arbre (10) tournent sensiblement sans glissement l'un par rapport à l'autre.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que l'équipement de support (2, 2' ; 3 ; 35) présente le disque de support (2, 2') comme premier dispositif de support et la meule (1), l'élément d'arbre (10) et le disque de support (2, 2') sont réglés en ce qui concerne leur vitesse de rotation respective.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que l'équipement de support (2, 2' ; 3 ; 35) présente le disque de support (2, 2') comme premier dispositif de support, l'élément d'arbre étant, lors de la rectification de finition, entraîné/freiné par le biais de la meule (1) et du disque de support (2, 2').
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que l'élément d'arbre (10) est disposé entre la meule (1) et le premier dispositif de support, présentant le disque de support (2, 2'), de l'équipement de support (2, 2' ; 3, 35), le disque de support (2, 2') étant réalisé avec une garniture à la manière d'une meule.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que la mesure des valeurs de diamètre s'effectue au moyen d'au moins deux dispositifs de mesure (21 ; 22).
  8. Procédé selon la revendications 1, caractérisé en ce que l'équipement de support (2, 2' ; 3 ; 35) présente deux règles d'appui (3 ; 35), lesquelles sont ajustées l'une par rapport à l'autre et sont réalisées sous la forme d'un prisme.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que la meule (1) et l'élément d'arbre (10) sont déplacés axialement l'un par rapport à l'autre et l'élément d'arbre (10) est rectifié en l'occurrence au moins partiellement en parallèle dans le temps sur la partie à symétrie de révolution et sur une face plane (25).
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que l'équipement de support (2, 2' ; 3 ; 35) présente le disque de support (2, 2') comme premier dispositif de support, le disque de support étant réalisé comme disque de réglage et l'élément d'arbre (10) entraîné en rotation tournant sensiblement sans glissement par rapport à celui-ci, la meule (1), l'élément d'arbre (10) et le disque de réglage étant en particulier réglés en termes de vitesse de rotation.
  11. Procédé selon la revendications 10, caractérisé en ce que l'élément d'arbre (10), lors de la rectification de finition, est entraîné par la meule (1) et le disque de réglage, la meule (1) et le disque de réglage formant un interstice de rectification dans lequel l'élément d'arbre est disposé de manière supportée sur le rail d'appui.
  12. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que les deux rails d'appui sont ajustés l'un par rapport à l'autre et forment un prisme comme équipement de support asservi au diamètre rectifié actuel respectif.
  13. Système constitué d'une rectifieuse et d'un élément d'arbre (10) pour la rectification extérieure de l'élément d'arbre (10) comprenant des parties à symétrie de révolution et des faces frontales comprenant des alésages de centrage ménagés dans celles-ci et définissant un axe longitudinal de référence et un axe de rotation de l'élément d'arbre (10), comprenant une meule (1) disposée sur une broche porte-meule (4) et entraînée en rotation par le biais d'un axe CNC, comprenant une poupée porte-pièce (13) dotée d'une première pointe (11) et comprenant une contrepoupée (15) dotée d'une deuxième pointe (14), l'élément d'arbre (10) étant, au moyen de la première et de la deuxième pointe (11 ; 14), pendant la rectification, entraîné de manière rotative autour d'un axe longitudinal de référence ainsi défini et maintenu de manière permanente,
    un équipement de support (2, 2' ; 3 ; 35) comprenant un premier et un deuxième dispositif de support, lesquels peuvent être ajustés l'un par rapport à l'autre, et un dispositif de mesure étant prévus, dispositif de mesure au moyen duquel des signaux de mesure du diamètre actuel de la partie à symétrie de révolution de l'élément d'arbre (10) peuvent être transmis à un dispositif de commande et sur la base desquels le premier et le deuxième dispositif de support sont constamment asservis au diamètre actuel de la partie à symétrie de révolution jusqu'à la dimension finie de telle sorte que l'élément d'arbre (10) soit supporté doublement par le biais des dispositifs de support (2, 2' ; 3 ; 35) en regard de la meule (1) et lorsque les pointes (11 ; 14) sont en prise pendant tout le processus de rectification,
    caractérisé en ce que
    le premier dispositif de support est un disque de support (2, 2') ou une règle d'appui (35) et le deuxième dispositif de support est une règle d'appui (35), laquelle peut être asservie constamment au diamètre actuel de la partie à symétrie de révolution jusqu'à la dimension finie de telle sorte que, lors de la rectification, les parties à symétrie de révolution de l'élément d'arbre (10) peuvent être supportées entre les pointes (11, 14).
  14. Système selon la revendication 13, caractérisé en ce que le premier dispositif de support est le disque de support (2, 2') et la meule (1), le disque de support (2, 2') et l'élément d'arbre (10) peuvent être réglés en termes de vitesse de rotation respectivement par commande CNC.
  15. Système selon la revendication 13, caractérisé en ce que le premier dispositif de support est le disque de support (2, 2'), le disque de support (2, 2') reposant sur une broche (5) et étant divisé et chaque élément pouvant être asservi au diamètre actuel de parties à symétrie de révolution correspondantes de l'élément d'arbre (10), de manière à supporter celles-ci.
  16. Système selon l'une des revendications 13 à 15, caractérisé en ce que le premier dispositif de support est une règle d'appui (3) et le deuxième dispositif de support est une autre règle d'appui (35), laquelle est déplaçable par rapport à la règle d'appui (3) en formant une région de support de type prisme au niveau de la partie à symétrie de révolution de l'élément d'arbre (10).
  17. Système selon l'une des revendications 13 à 16, caractérisé en ce que le dispositif de mesure est un dispositif de mesure en cours de fabrication (21).
  18. Système selon l'une des revendications 13 à 17, caractérisé en ce que des éléments d'entraînement (12) sont présents sur la broche porte-pièce (13), au moyen desquels l'élément d'arbre (10) peut être entraîné en rotation et lesquels peuvent être libérés de l'entrée en prise sur l'élément d'arbre (10).
EP16715325.3A 2015-04-13 2016-04-08 Procédé et système de rectification extérieure d'éléments d'arbre entre des pointes Active EP3283257B1 (fr)

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ES2930675T3 (es) 2022-12-20
JP2018513025A (ja) 2018-05-24
CN107530857A (zh) 2018-01-02
US20180085881A1 (en) 2018-03-29
US10766114B2 (en) 2020-09-08
EP3283257A1 (fr) 2018-02-21
DE102015206565A1 (de) 2016-10-13
DE102015206565B4 (de) 2024-02-08
WO2016166036A1 (fr) 2016-10-20

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