CH692450A5 - Programmatic grinder. - Google Patents

Programmatic grinder. Download PDF

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Publication number
CH692450A5
CH692450A5 CH278297A CH278297A CH692450A5 CH 692450 A5 CH692450 A5 CH 692450A5 CH 278297 A CH278297 A CH 278297A CH 278297 A CH278297 A CH 278297A CH 692450 A5 CH692450 A5 CH 692450A5
Authority
CH
Switzerland
Prior art keywords
workpiece
spindle
grinding
machine
guide
Prior art date
Application number
CH278297A
Other languages
German (de)
Inventor
Fritz Fahrni
Original Assignee
Ewag Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ewag Ag filed Critical Ewag Ag
Priority to CH278297A priority Critical patent/CH692450A5/en
Publication of CH692450A5 publication Critical patent/CH692450A5/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00Component parts such as frames, beds, carriages, headstocks
    • B24B41/06Work supports, e.g. adjustable steadies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00Drives or gearings; Equipment therefor
    • B24B47/02Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables

Description


  


 Technical field
 



  The invention relates to a program-controlled grinding machine, according to the preamble of claim 1, for grinding workpieces, in particular metallic workpieces, such as tools of machine tools.  


 State of the art
 



  Program-controlled grinding machines are u. a.  for grinding or regrinding of processing tools (drills, milling cutters, cutting blades, chisels, round broaching tools etc. ) used for machine tools, these processing tools made of metal and / or other materials, such as. B.  ceramic materials.  A machine tool can only machine a workpiece as precisely as the machining tool used allows.  Therefore, extreme precision is required for grinding or regrinding these processing tools.  This high level of accuracy can usually only be achieved using grinding machines that have program control.  



  Nowadays, numerical controls (NC or CNC controls) are preferably used as program controls for grinding machines, in particular tool grinding machines.  In principle, however, other program controls for grinding machines are also possible, e.g. B.  Cam controls or mechanical post-form controls.  In the following, a program-controlled grinding machine is understood to mean a grinding machine that is influenced by any analog or digital program control.  



  Program-controlled grinding machines are u. a.  known from EP-A1 072 887 and EP-A2 611 630.  EP-A1 072 887 describes a program-controlled grinding machine which is constructed in the widely used column construction.  This grinding machine has a vertical column, on which a grinding spindle head is arranged, which carries one or more grinding spindles.  The grinding spindles are equipped with one or more grinding wheels.  The grinding spindle head is pivotable and translationally arranged on the column in the vertical direction. 

   The column, in turn, is rotatable about a vertical axis and horizontally displaceable along a translational axis next to a workpiece holder, the workpiece holder holding the workpiece to be ground being adjustable with respect to the translatory and rotational axes relative to the column.  For processing rotating workpieces, such as. B.  Drill, the workpiece holder can have a workpiece clamping device rotatable about a horizontal workpiece rotation axis for holding the workpiece to be ground.  



  Column-shaped grinding machines have the advantage, on the one hand, that they can be used to machine workpieces that have a considerable extent, at least in the horizontal direction.  On the other hand, these grinding machines have a number of disadvantages.  So their construction is technically complex and the freedom for processing is z. T.  restricted by the column.  Long, unproductive adjustment paths for the grinding wheels are required for certain grinding work, which increases the cost of operating the grinding machine.  Due to the asymmetrical arrangement of the column with respect to the workpiece (the column is on one side next to the workpiece) z. B.  right and left spiral milling cutters, drills etc.  cannot be sanded at the same level, which requires repeated clamping to sand them.  



  The grinding machine known from EP-A2 611 630 is designed in a portal construction and has a workpiece holder arranged on a turntable, which can have a workpiece clamping device that can be rotated about a horizontal workpiece rotation axis, for receiving preferably rotating workpieces.  The turntable is arranged so that it can pivot about a vertical C axis on a slide that can be moved horizontally in the X direction, the linear guideway of the slide being firmly attached to the machine bed of the grinding machine. 

   A portal-shaped structure with two lateral stands and a horizontal bridge connecting the two stands, which runs above the machine bed and on which the grinding spindle head can be adjusted along a horizontal Y-axis and a vertical Z-axis and, if necessary, about a vertical axis of rotation, is also attached to the machine bed is pivotally arranged.  



  A grinding machine designed in accordance with the teaching of EP-A2 611 630 is suitable due to its symmetrical machine structure with regard to the workpiece for the equal ranking grinding of right and left spiral workpieces.  Due to the arrangement of the workpiece holder on a turntable, which in turn is arranged on a slide, only relatively small workpieces can be processed.  The workpiece, including the workpiece clamping device and any means available for supporting and / or stabilizing the workpiece, must find space on the turntable.  This is particularly the grinding of relatively long and thin workpieces (z. B.  Drills) with a grinding machine of this type.  


 Presentation of the invention
 



  The object of the invention is to provide a grinding machine which overcomes the disadvantages of the known grinding machines mentioned above and is particularly suitable for the economical and precise grinding of long, thin workpieces.  



  The solution to the problem is the subject of independent claim 1.  



  A program-controlled grinding machine according to the invention has a workpiece holding device which is translationally movable by means of first drive means along a machine bed in the X direction and is designed to receive a workpiece to be ground, and a workpiece guide device which is translationally movable by means of second drive means on the machine bed in the X direction is designed to guide and / or support the workpiece to be ground.  The second drive means can be controlled in such a way that it is optionally possible to move the workpiece guide device synchronously with the workpiece holding device or to block the workpiece guide device with respect to the machine bed.  



  The grinding machine according to the invention in particular also enables the precise grinding of long and thin workpieces, in that the workpieces can always be optimally supported at the grinding location by means of the workpiece guide device, while the workpiece held by the workpiece holding device is moved past the grinding location.  



  Because the workpiece guide device only has to be moved either synchronously with the workpiece holder device or blocked at one location on the machine bed, the drive means of the workpiece guide device can be driven indirectly by the drive means of the workpiece holder device.  As a result, in the grinding machine according to the invention only the drive means of the workpiece holding device need to be controlled directly by the program control of the grinding machine, which reduces the manufacturing costs and the effort for programming the program control in comparison to a grinding machine with two drive means controlled directly by the program control.  



  The grinding machine according to the invention has z. B.  A grinding machine constructed according to the teaching of EP-A2 611 630 has the further advantage that the support steady rest (and possibly the counter tip) are not connected in series-kinematics over several stages with respect to the machine bed.  In the grinding machine according to EP-A2 611 630, a support bezel would, if desired, be arranged on the swiveling rotary plate carrying the tool holder, which in turn is arranged on a slide that can be moved linearly with respect to the machine bed.  The movements of the support steady rest (and possibly counter tip) are thus connected in series-kinematics to the swiveling movement of the turntable and the linear movement of the slide. 

   With series-kinematically sequential movements, on the one hand the masses to be moved by the drives become large, which has a disadvantageous effect on the maximum achievable accelerations and thus on the processing speed.  On the other hand, the total error of the movement of the last movement axis is composed of the sum of the deviations of the individual movement axes, which has a disadvantageous effect on the precision of the movement that can be achieved.  In contrast to the grinding machine according to EP-A2 611 630, in the grinding machine according to the invention the workpiece holding device, the support steady rest and possibly the countertip with respect to the machine bed are not movable in a serial kinematic, but in a parallel kinematic arrangement.  



  Preferably, the grinding machine according to the invention further comprises a longitudinal guide device fixedly arranged on the machine bed for guiding the translatory movements of the workpiece holding device and the workpiece guide device in the X direction.  



  According to a further preferred embodiment of the grinding machine according to the invention, the workpiece guide device has a positioning device for optionally positioning at least one guide element in a position for guiding and / or supporting the workpiece to be ground or in a neutral position in which the latter does not touch the workpiece to be ground.  



  The first drive means of a grinding machine according to the invention preferably comprise a first spindle driven by a motor, which interacts with a first nut fixedly attached to the workpiece holding device in order to translate the workpiece holding device in the X direction in the manner of a spindle-nut drive.  A ball screw is preferably used for this purpose.  However, other suitable linear drives (e.g. B.  a directly driven linear motor or a piston-cylinder drive) can be used to drive the workpiece holding device with respect to the machine bed.  



  The second drive means of a grinding machine according to the invention preferably comprise a second spindle driven by a motor, which interacts with a second nut fixedly attached to the workpiece guide device in order to translate the workpiece guide device in the X direction in the manner of a spindle-nut drive.  A ball screw is preferably used for this purpose.  The grinding machine preferably further comprises first coupling means for the optionally releasable, rotationally fixed coupling of the rotational movement of the first spindle with that of the second spindle, in order to optionally bring about a synchronous movement of the workpiece guide device with the workpiece holding device or a blocking of the workpiece guide device with respect to the machine bed (20).  



  In an alternative embodiment of the invention, other suitable linear drives (e.g. B.  a directly driven linear motor or a piston-cylinder drive) can be used to drive the workpiece guide device with respect to the machine bed.  



  In a further preferred embodiment of the invention, the grinding machine further comprises a counter-sharpening device, which can be translated in the X direction by means of third drive means on the machine bed and is designed to guide and / or support the workpiece to be ground, the third drive means being controllable in such a way that optionally a synchronous one Moving the counterpoint device with the workpiece holding device or blocking the counterpoint device with respect to the machine bed is possible.  The third drive means preferably in turn comprise a ball screw. 

   Furthermore, the grinding machine preferably comprises second coupling means for the optionally releasable, rotationally fixed coupling of the rotational movement of the first spindle with that of the third spindle, in order to optionally bring about a synchronous movement of the counter-sharpening device with the workpiece holding device or to block the counter-sharpening device with respect to the machine bed.  However, other suitable linear drives can also be used to drive the counterpoint device with respect to the machine bed.  



  In an alternative embodiment of the invention, instead of the coupling means mentioned above, suitably controlled drive means can be provided in order to ensure that the workpiece guide device or  to effect the counter-sharpening device with the workpiece holding device.  



  The grinding machine according to the invention preferably comprises a U-shaped portal with two lateral stands, which are fixedly arranged on the machine bed, and an essentially horizontal bridge connecting the two stands, which can be moved translationally above the machine bed in the vertical Z direction and arranged on the two stands in this way for carrying a grinding spindle head that the machine bed, the two stands and the bridge limit a passage free in the X direction for at least partially carrying out a workpiece to be ground.  The portal is preferably arranged with respect to the machine bed in such a way that the workpiece guide device can be moved translationally in the X direction through the free passage. 

   It is further preferred that the workpiece holding device and - if present - the counter-pointed device can also be moved through the free passage.  Furthermore, the grinding spindle head is preferably translationally movable essentially horizontally with respect to the machine bed 20 and at right angles to the X direction in a Y direction and is arranged on the portal bridge so as to be pivotable about a substantially vertical axis of rotation.  



  The following detailed description of the present invention in conjunction with the accompanying drawings serves only as an example for a better understanding of the invention and is not to be interpreted as a limitation of the scope of the patent claims.  Further advantageous embodiments and combinations of features are readily apparent to those skilled in the art from the following description in conjunction with the accompanying drawings and the entirety of the claims, which, however, are still within the scope of the present invention.  


 Brief description of the drawings
 



  The drawings illustrate an embodiment of the present invention.  Show it:
 
   FIG.  1 shows a grinding machine according to an exemplary embodiment of the invention in a schematic perspective illustration;
   FIG.  2 shows a section of the grinding machine according to FIG.  1 in perspective.  
 


 Ways of Carrying Out the Invention
 



  The in Fig.  1 has a stable, box-shaped machine bed 20, which is produced, for example, as a cast part from gray cast iron or as a welded construction.  The machine bed 20 is essentially rectangular in plan view and has two long sides 22, 24 which are significantly longer than the rear side 23 and the front side 21 of the machine bed 20.  



  On the top 25 of the machine bed 20, a longitudinal guide 50 is arranged approximately centrally between the two long sides 22, 24 of the machine bed 20.  The longitudinal guide 50 comprises two guide rails 54, 55 which are arranged parallel to one another and are fixed on the upper side 25 of the machine bed 20 and extend essentially in the X direction (in the longitudinal direction of the machine bed 20) along the longitudinal sides 22, 24 of the machine bed 20 over the entire length extend the machine bed 20.  As in Fig.  2 can be clearly seen, the guide rails 54, 55 in the embodiment of the invention shown in the figures have a substantially square cross section.  However, other guide rails or other suitable guide means for linear guidance in the X direction can also be used.  



  On the longitudinal guide 50, three carriages 60, 70, 80 are mounted one behind the other in the X-direction in the longitudinal direction X of the machine bed, one behind the other.  For the sake of clarity,  2, the rearmost carriage 60 (with the workpiece holder 61 described below) and the bellows for covering the spindles are not shown.  



  The rearmost carriage 60 carries a workpiece holder 61 for holding or clamping a workpiece to be ground.  The workpiece holder 61 according to the embodiment of the invention shown in the figures has a workpiece clamping device 62 which can be rotated about a horizontal workpiece rotation axis A and is in the form of a chuck 62 for receiving preferably round workpieces.  The workpiece clamping device 62 is arranged on the slide 60 of the workpiece holder 61 such that the axis of rotation A lies in the X direction, parallel to the longitudinal guide 50.  The workpiece clamping device 62 is coupled to a suitable actuator in order to carry out a rotary actuating movement about the axis of rotation A in a manner known per se - controlled by the program control of the grinding machine 10 - in accordance with a control program. 

   For this purpose, the actuator comprises an electric motor 63 arranged on the carriage 60, which is coupled to the workpiece clamping device 62 via a worm gear in order to drive it for rotation.  The electric motor 63 is controlled by the program control of the grinding machine 10.  



  The middle slide 70 is designed to carry one or more support or guide means for supporting and / or guiding the workpiece to be ground.  In the grinding machine 10 according to the invention shown in the figures, the slide 70 carries a support bezel 72 and a guide bush 74.  The support steady rest 72 or the guide sleeve 74 can optionally - controlled by the program control of the grinding machine 10 - be moved on the carriage 70 into a position for supporting and / or guiding the workpiece to be ground or into a neutral position, in which the latter it is to be ground Do not touch the workpiece. 

   In the embodiment shown in the figures, the support bezel 72 and the guide bush 74 are on a longitudinal guide in the Y direction (i.e. H.  horizontally and at right angles to the X direction) slidably mounted on the carriage 70.  By a first spindle-nut drive, which is shown in Fig.  2 schematically illustrated electric motor 71 is actuated, the support steady rest 72 can either be in a position for supporting and / or guiding the workpiece to be ground approximately in the middle of the slide 70 or in a neutral position at the slide end, which is closer to the long side 22 of the machine bed 20 lies, are moved. 

   A second spindle-nut drive, which is shown in Fig.  2 schematically illustrated electric motor 73 is actuated, the guide bush 74 can either be in a position for supporting and / or guiding the workpiece to be ground approximately in the middle of the carriage 70 or in a neutral position at the end of the carriage, which is closer to the longitudinal side 24 of the machine bed 20 lies, are moved.  The electric motors 71, 73 are controlled by the program control of the grinding machine 10.  



  In alternative embodiments of the invention, one or more different support and / or guide means for the tool to be ground, which are carried on the carriage 70, can also be used with other suitable adjusting devices (such as e.g. B.  a piston-cylinder actuator or a swivel mechanism) are moved into and out of a supporting or guiding position, or the carriage 70 can carry a supporting and / or guiding device fixedly mounted thereon.  



  The foremost carriage 80 carries a so-called counter tip or centering tip 82 in order to stabilize and / or center the workpiece to be ground at its end opposite the end on the workpiece holder side.  The counter tip 82 is fixed on the slide 80 and exactly in the center of the workpiece rotation axis A and serves to stabilize / center, in particular, long, thin workpieces which are rotated about the workpiece rotation axis A during grinding by means of the rotatable workpiece clamping device 62.  



  For the translatory displacement of the slides 60, 70, 80 in the X direction on the longitudinal guide 50, the grinding machine 10 has three spindles 51, 52, 53, which essentially extend in the X direction (parallel to the guide rails 54, 55) extend the entire length of the machine 20.  The spindles 51, 52, 53 are in the axial direction (i.e. H.  in the X direction) immovable and rotatable on the machine bed 20 about rotation axes.  The spindles 51, 52, 53 are arranged with respect to the machine bed 20 such that their axes of rotation run in the X direction, parallel to the guide rails 54, 55 and to the workpiece rotation axis A.  



  The spindles 51, 52, 53 are each supported in the area of the two axial spindle ends in suitable bearings on the machine bed 20, the bearings either on bearing blocks, as shown in FIG.  2 shown at 56, or in the front and / or rear end walls of the machine bed 20 are fixedly arranged on the machine bed 20.  



  As in Fig.  2 can be seen, the spindle 51 is arranged in such a way that it is passed under the slide 80 with the opposite tip 82 and the slide 70 with the support means 72, 74 without touching them.  The spindle 51 interacts with a nut which is fastened to the slide 60 with the workpiece holder 61 in order to translate the slide 60 on the linear guide 50 in the X direction in the manner of a spindle-nut drive.  



  Similarly, the spindle 52 is arranged such that it is passed under the slide 80 with the counter tip 82 and the slide 60 with the workpiece holder 61 without touching it.  The spindle 52 cooperates with a nut 75 which is fastened to the slide 70 with the support means 72, 74 in order to translate the slide 70 on the longitudinal guide 50 in the X direction in the manner of a spindle-nut drive.  



  The spindle 53 is arranged in an analogous manner such that it is carried out under the slide 60 with the workpiece holder 61 and the slide 70 with the support means 72, 74 without touching them.  The spindle 53 interacts with a nut 85 which is fastened to the slide 80 with the counter tip 82 in order to translate the slide 80 on the longitudinal guide 50 in the X direction in the manner of a spindle-nut drive.  



  In the embodiment shown in the figures, for the spindle-nut drives 51; 52, 75 and 53, 85 ball screws used.  In principle, however, other suitable spindle-nut drives can also be used for the translatory drive of the slides 60, 70 and 80 on the longitudinal guide 50.  



  In the exemplary embodiment of the invention shown in the figures, the spindle 51, which cooperates with the nut on the slide 60 with the workpiece holder 61, is driven to rotate via a toothed belt 58 by an electric motor 57.  The electric motor 57 and the toothed belt 58 are arranged on the machine bed in the region of the axially rear ends of the spindles 51, 52, 53, near the rear side 23 of the machine bed 20, the electric motor 57 being controlled by the program control of the grinding machine 10.  



  The spindle 52, which cooperates with the nut 75 on the slide 70 with the support means 72, 74, has a coupling 91 designed as a first coupling means in the region of its axially front spindle end.  In order to drive the spindle 52 for rotation, it is connected to the spindle 51 driven by the electric motor 57 via the coupling 91 and a toothed belt 92.  The clutch 91 - controlled by the program control of the grinding machine 10 - can be actuated in such a way that it either effects a rotationally fixed connection between the spindle 51 and the spindle 52 via the toothed belt 92 or releases this rotationally fixed connection.  When the clutch 91 is engaged, the toothed belt 92 effects a rotationally fixed connection between the spindle 51 and the spindle 52 in such a way that the rotational movement of the spindle 51 is coupled to that of the spindle 52. 

   The spindle 52 is then driven to rotate by the spindle 51 in such a way that the slide 70 with the support means 72, 74 is moved in translation in the X direction in synchronism with the slide 60 with the workpiece holder 61.  When the clutch 91 is disengaged, torque is no longer transmitted from the spindle 51 to the spindle 52.  In the embodiment of the invention shown in the figures, the self-locking of the spindle-nut drive 52, 75 is in this case large enough to block the slide 70 on the longitudinal guide 50 with respect to the machine bed 20.  In an alternative embodiment of the invention, a braking device that can be controlled by the program control of the grinding machine 10 is provided in order to optionally block the slide 70 on the longitudinal guide 50 (and thus the machine bed 20).  



  In an analogous manner, the spindle 53, which interacts with the nut 85 on the slide 80 with the counter tip 82, has a coupling 93 designed as a second coupling means in the region of its axially front spindle end, which coupling - again controlled by the program control of the grinding machine 10 - can be actuated in this way is that it either causes a non-rotatable connection between the spindle 51 and the spindle 53 via a toothed belt 94 or releases this non-rotatable connection. 

   When the clutch 93 is engaged, the toothed belt 94 provides a rotationally fixed connection between the spindle 51 and the spindle 53 such that the rotational movement of the spindle 51 is coupled to that of the spindle 53 and the spindle 53 is driven to rotate by the spindle 51 in this way that the slide 80 with the counter tip 82 is moved in translation in the X direction in synchronism with the slide 60 with the workpiece holder 61.  When the clutch 91 is disengaged, no more torque is transmitted from the spindle 51 to the spindle 53 and the slide 80 is blocked due to the self-locking of the spindle-nut drive 53, 85 on the longitudinal guide 50 with respect to the machine bed 20. 

   Again, a braking device that can be controlled by the program control of the grinding machine 10 can be provided in order to optionally block the slide 70 on the longitudinal guide 50 (and thus the machine bed 20).  



  With this embodiment of the invention, an inexpensive construction of the grinding machine 10 is achieved, since only a single program-controlled drive spindle 51 is required to drive and control the three carriages 60, 70, 80 and the other two drive spindles 52, 53 indirectly via this one program-controlled drive spindle 51 are driven to rotate.  



  For grinding z. B.  a long, thin workpiece can first the desired support element, for. B.  the support steady rest 72, on which the carriage 70 is moved in the Y direction into a position for supporting and / or guiding the workpiece to be ground.  Then the workpiece to be ground is clamped in the chuck 62 of the workpiece holder 61.  Then, when the carriage 80 is blocked (i.e. H.  with the coupling 93 released, the slide 60 can be moved on the longitudinal guide 50 until the workpiece to be ground contacts the counter tip 82 and is thus centered and stabilized by the latter.  At the same time, if necessary, the slide 70 can be moved in synchronism with the slide 60 on the longitudinal guide 50 in order to bring the slide 70 to the grinding location below the portal 30. 

   The three slides can then be moved in the X direction to their starting position for the actual grinding process, either all three being moved synchronously with one another or the slide 60 being moved alone or together with one of the other two.  As soon as the three carriages 60, 70, 80 have reached the starting position for the grinding process, the coupling 91 can be released and the coupling 93 can be coupled in order to grind the workpiece together with the synchronously running carriages 60 and 80 on the support bezel which is stationary with respect to the machine bed 72 and also to move the stationary grinding spindle 42 past,

   the steady rest 72 preferably supports and / or guides the workpiece to be ground in the vicinity of the grinding location and the counter tip 82, which moves synchronously with the workpiece, continuously stabilizes the moving workpiece.  



  As an alternative, both the clutch 91 and the clutch 93 can also be engaged for grinding in order to move both the support bezel 72 and the counter tip 82 synchronously with the slide 60 (and thus with the workpiece to be ground).  



  If desired, a workpiece can also be ground on the fly, i. H.  without stabilization or centering by the counter tip 82.  In this case, the counter tip 82 is preferably moved to the front end of the longitudinal guide 50 and then the coupling 93 is disengaged and the carriage 80 is thus blocked so that the counter tip 82 which is not required does not unnecessarily restrict the machining space for grinding.  The grinding can then either be carried out either with the clutch 91 engaged and thus in synchronism with the workpiece moving support bezel 72 or with the clutch 91 disengaged and thus the stationary support bezel 72.  



  It goes without saying that, as a further alternative, a workpiece can also be ground without any support and / or guidance by the counter tip 82, the support bezel 72 or the guide bush 74.  For this, e.g. B.  Both the slide 70 and the slide 80 are displaced to the front end of the guide 50 in such a way that neither the support bezel 72 nor the guide bush 74 nor the counter tip 82 touch the workpiece to be ground.  Couplings 91 and 93 are then released for grinding.  



  The spindle-nut drives 51; 52, 75; 53, 85, the coupling devices 91, 93, the toothed belts 58, 92, 94 and the electric motors are shielded with bellows in a manner customary for grinding machines for protection against contamination by grinding dust and / or other foreign substances.  A first bellows 95 covers the electric motor 57, the toothed belt 58 and the spindles 51, 52, 53 from the rear spindle ends to the slide 60.  A second bellows 96 extends between the slides 60 and 70.  A third bellows 97 covers the spindles 51, 52, 53 between the carriages 70 and 80, and a fourth bellows 98 extends from the carriage 80 to the front spindle ends and, in addition to the spindles 51, 52, 53, also covers the bearing block 56, the clutches 91, 93 and the timing belts 92, 94.  



  On the upper side 25 of the machine bed 20, a portal-shaped structure 30, hereinafter referred to as the portal 30, is also firmly connected.  The U-shaped portal 30 has two essentially vertical side walls or stands 31, 32 and a substantially horizontal bridge 33 connecting the two stands 31, 32 and to be arranged above the machine bed 20.  For rigid attachment of the stands 31, 32 to the machine bed 20, the former can be fastened to the latter by means of screws or by welding, or the machine bed 20 together with the stands 31, 32 can be designed as a one-piece casting. 

   The bridge 33 extends in the Y direction, i. H.  horizontally and at right angles to the X direction, from the stand 31 to the stand 32 and is arranged so as to be longitudinally displaceable in the vertical Z direction on the two stands 31, 32 in order to enable a height adjustment of the bridge 33 and of the grinding spindle head 40 arranged thereon.  To adjust the height of the bridge 33, a vertical spindle is attached to each of the two stands 31, 32, each of which cooperates with a nut, which is fastened to one of the two ends of the bridge 33 on the support side, in the manner of a spindle-nut drive.  For this purpose, two ball screws are preferably used for the two spindle-nut drives along the stands 31, 32. 

   The two spindles are driven by toothed belts by a single, common electric motor, so that an exactly parallel displacement of the bridge 33 along the two stands 31, 32 is ensured.  The in Fig.  1, the electric motor shown schematically at 38 is arranged in the machine bed 20 below the top 25 thereof and is controlled by the program control of the grinding machine 10.  As usual with grinding machines, the two spindle-nut drives for the height adjustment of the bridge 33 for protection against contamination by grinding dust and / or other foreign matter are each with a bellows from the stand foot to the bridge 33 and a further bellows from the bridge 33 to shielded upper end of the stand. 

   Of these four bellows is shown in Fig.  1, the bellows 34 is shown as an example, which extends along the stand 31 from the top 25 of the machine bed 20 to the bridge 33.  



  The portal 30 forms, together with the machine bed 20, a free passage 36 in the X direction, delimited by the upper side 25 of the machine bed 20, the stands 31, 32 and the bridge 33, through which the guide rails 54, 55 of the longitudinal guide pass approximately in the middle 50 run.  As a result, both the slide 70 together with the support means 72, 74 and the slide 60 together with the workpiece holder 61 and the slide 80 together with the counter tip 82 can be displaced through the free passage 36 of the portal 30.  Thus, the entire workpiece to be ground can be moved through the passage 36 for grinding, and there is no restriction in principle on the length of the workpieces to be ground, which is due in principle to the construction of the grinding machine 10.  



  On the bridge 33, a linear guide is arranged, which for guiding a in the Y direction, i. H.  horizontally and at right angles to the X direction, on the bridge 33 slidably arranged carriage 37 is used.  The carriage 37 is moved translationally in the Y direction on the linear guide on the bridge 33 by a servomotor (not shown) arranged on the bridge 33.  This servomotor is controlled by the program control of the grinding machine 10.  The servomotor and the linear guide on the bridge 33 are in turn shielded by bellows 45, 46.  



  A grinding spindle head 40 is arranged on the carriage 37 so as to be pivotable about an essentially vertical axis of rotation C.  In the grinding machine 10 shown in the figures, the grinding spindle head 40 can be pivoted by 360 ° about the axis of rotation C by means of the electric motor 41.  As known per se, the grinding spindle head 40 can comprise one or more grinding spindles 42, each of which is equipped with one or more grinding wheels 44.  The one or more grinding spindles are driven by an electric motor 47 flanged to the grinding spindle head in a manner customary for grinding machines.  



  The actuator 38 for the height adjustment of the bridge 33, the actuator for the linear displacement of the slide 37 in the Y direction and the actuator 41 for the swiveling movement of the grinding spindle head 40 are controlled by the program control of the grinding machine 10 in order to translate the respective movement according to a control program in Y or  Z direction as well as a rotary adjustment movement around the axis of rotation C.  



  In an alternative embodiment of the grinding machine according to the invention, which is not shown in the drawings, the grinding spindle head is additionally arranged on the slide of the portal so as to be pivotable about a horizontal pivot axis.  In another alternative embodiment of the invention, the portal bridge is rigidly and non-displaceably attached to the two portal stands, and the translational displaceability of the grinding spindle head in the Y and Z directions is provided by a cross slide attached to the portal bridge.  



  Overall, in the grinding machine according to the invention, the grinding spindle head 40 in the area of the passage 36 formed by the portal 30 and the machine bed 20 can be displaced translationally with respect to the machine bed 20 in a horizontal Y direction and a vertical Z direction and pivoted about a vertical axis of rotation C.  



  In summary, it can be stated that the invention provides a program-controlled grinding machine which, in particular, also enables the precise grinding of long and thin workpieces by moving long workpieces for grinding through the portal passage 36 and the workpieces by means of a support bezel 72 or a guide bush 74 can always be optimally supported at the grinding location.  Because the grinding spindle head 40 can be moved on both sides of a workpiece to be ground centrally in the portal passage and can also be pivoted about the vertical axis of rotation C, right-hand and left-hand spiral workpieces can also be ranked equally with the grinding machine 10 (i.e. H.  without reclamping) and therefore be ground economically. 

Claims (10)

  1. Program-controlled grinding machine (10) with a workpiece holding device (60, 61), which is translationally movable in the X direction along a machine bed (20) by means of first drive means (51) and is designed to hold a workpiece to be ground, characterized in that the grinding machine further comprises a workpiece guide device (70, 72, 74) which is translationally movable in the X direction on the machine bed (20) on the machine bed (20) and is designed for guiding and / or supporting the workpiece to be ground, the second drive means (52, 75) can be controlled in such a way that either synchronous movement of the workpiece guide device (70, 72, 74) with the workpiece holding device (60, 61) or blocking of the workpiece guide device (70, 72, 74) with respect to the machine bed (20) is possible ,
Second
 Grinding machine (10) according to claim 1, characterized in that it further comprises a longitudinal guide (50, 54, 55) arranged fixedly on the machine bed (20) for guiding the translatory movements of the workpiece holding device (60, 61) and the workpiece guide device (70, 72 , 74) in the X direction.
3. Grinding machine (10) according to claim 1 or 2, characterized in that the workpiece guide device (70, 72, 74) a positioning device for optionally positioning at least one guide element (72, 74) in a position for guiding and / or supporting the to be ground Workpiece or in a neutral position, in which the latter does not touch the workpiece to be ground.
4th
 Grinding machine (10) according to one of claims 1 to 3, characterized in that the first drive means (51) comprise a first spindle (51) driven by a motor (57), which are fixedly attached to the workpiece holding device (60, 61) first nut cooperates in order to translate the workpiece holding device (60, 61) in the X direction in the manner of a spindle-nut drive.
5th
 Grinding machine (10) according to claim 4, characterized in that the second drive means (52, 75) comprise a second spindle (52) which interacts with a second nut (75) fixedly attached to the workpiece guide device (70, 72, 74), in order to translate the workpiece guide device (70, 72, 74) in the X direction in the manner of a spindle-nut drive, and the grinding machine (10) furthermore first coupling means (91) for the optionally releasable, rotationally fixed coupling of the rotary movement of the first spindle (51 ) with that of the second spindle (52) in order to selectively synchronously moving the workpiece guide device (72, 74) with the workpiece holder device (60, 61) or blocking the workpiece guide device (72, 74) with respect to the machine bed (20) cause.
6th
 Grinding machine (10) according to one of claims 1 to 5, characterized in that it further comprises a translationally movable in the X direction on the machine bed (20) by means of third drive means (53, 85) for guiding and / or supporting the workpiece to be ground trained counterpoint device (80, 82), the third drive means (53, 85) being controllable in such a way that either synchronous movement of the counterpoint device (80, 82) with the workpiece holding device (60, 61) or blocking of the counterpoint device (80, 82) with respect to the machine bed (20) is possible.
7th
 Grinding machine (10) according to claim 6, characterized in that the third drive means (53, 85) comprise a third spindle (53) which cooperates with a third nut (85) fixedly attached to the counter-sharpening device (80, 82) in order to Kind of a spindle-nut drive to move the counter-pointed device (80, 82) translationally in the X direction, and the grinding machine (10) further second coupling means (93) for selectively releasable rotationally fixed coupling of the rotary movement of the first spindle (51) with that of third spindle (53) to selectively cause a synchronous movement of the counter-tip device (80, 82) with the workpiece holder (60, 61) or blocking the counter-tip device (80, 82) with respect to the machine bed (20).
8th.
 Grinding machine (10) according to one of claims 1 to 7, characterized by a U-shaped portal (30) with two lateral stands (31, 32) which are fixedly arranged on the machine bed (20), and one of the two stands (31, 32) connecting, essentially horizontal bridge (33), to be arranged above the machine bed (20), translationally movable in the vertical Z direction on the two stands (31, 32), for carrying a grinding spindle head 40 such that the machine bed (20), the two stands (31, 32) and the bridge (33) delimit a passage (36) which is free in the X direction for at least partially carrying out a workpiece to be ground.
9. Grinding machine (10) according to claim 8, characterized in that the workpiece guide device (70, 72, 74) is translationally movable in the X direction through the free passage (36).
10th
 Grinding machine (10) according to claim 8 or 9, characterized in that the grinding spindle head (40) translationally substantially horizontally with respect to the machine bed (20) and at right angles to the X direction in the Y direction and movable about a substantially vertical axis of rotation ( C) is arranged pivotably on the bridge (33).
CH278297A 1997-12-03 1997-12-03 Programmatic grinder. CH692450A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH278297A CH692450A5 (en) 1997-12-03 1997-12-03 Programmatic grinder.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH278297A CH692450A5 (en) 1997-12-03 1997-12-03 Programmatic grinder.
DE1998155197 DE19855197A1 (en) 1997-12-03 1998-11-30 Program-controlled grinding machine

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
DE102004012823A1 (en) * 2004-03-16 2005-10-06 Vollmer Werke Maschinenfabrik Gmbh Device and method for clamping and positioning workpieces of different lengths between two tips
WO2013178625A1 (en) 2012-05-30 2013-12-05 Vollmer Werke Maschinenfabrik Gmbh Device for sharpening tools with cutters, such as for example drills, milling tools or the like
EP3711900A1 (en) 2019-03-22 2020-09-23 VOLLMER WERKE Maschinenfabrik GmbH Method and device for processing identical workpieces

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DE10028791A1 (en) * 2000-06-15 2002-01-03 Matthias Kaempfer Grinding machine for operating a grinding head sliding on a portal has a machine bed, a workpiece carrier and two props on each side of the workpiece carrier interconnecting via a lateral tie-bar to form a portal to overlap the carrier.
DE10062922A1 (en) * 2000-12-16 2002-06-20 Blohm Maschb Gmbh Workpiece holder for a grinding machine
US7226340B2 (en) 2004-03-05 2007-06-05 Alfred H. Schutte Gmbh & Co. Kg Grinding machine
DE102007009948A1 (en) * 2007-03-01 2008-09-04 Braun Gmbh Machine rounding ends of toothbrush bristles, has rounding tool led along path defined by guidance system associated with two or more axes
CN102229075B (en) 2011-05-16 2013-01-09 湘潭三峰数控机床有限公司 Multi-carriage symmetrical numerical control jig grinding machine
DE102015004211B4 (en) * 2015-03-31 2017-03-23 Emag Holding Gmbh After the pick-up process working grinding machine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004012823A1 (en) * 2004-03-16 2005-10-06 Vollmer Werke Maschinenfabrik Gmbh Device and method for clamping and positioning workpieces of different lengths between two tips
US7165483B2 (en) 2004-03-16 2007-01-23 Vollmer Werke Maschinenfabrik Gmbh Apparatus and method for clamping and positioning workpieces of different length between two centers
WO2013178625A1 (en) 2012-05-30 2013-12-05 Vollmer Werke Maschinenfabrik Gmbh Device for sharpening tools with cutters, such as for example drills, milling tools or the like
DE102012010689A1 (en) 2012-05-30 2013-12-05 Vollmer Werke Maschinenfabrik Gmbh Device for sharpening tools with cutting edges, such as drills, milling cutters or the like
US10532439B2 (en) 2012-05-30 2020-01-14 Vollmer Werke Maschinenfabrik Gmbh Device for sharpening tools with cutters, such as for example drills, milling tools or the like
EP3711900A1 (en) 2019-03-22 2020-09-23 VOLLMER WERKE Maschinenfabrik GmbH Method and device for processing identical workpieces

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