DE102014111317A1 - Apparatus and method for dressing a grinding wheel - Google Patents

Abstract

An apparatus (500) and corresponding method of dressing a cup-shaped grinding wheel (200) having an inner contour and an outer contour for grinding workpieces (300) in a grinding machine, the apparatus (500) including a first spindle (102) for receiving and rotationally driving the grinding wheel (200) and a second spindle (103) for receiving and rotationally driving a dresser (101); and a controller (S) and axle drives for relatively moving the grinding wheel (200) relative to the dresser (101) to assist in dressing the dresser (101) can be brought into operative connection with the grinding wheel (200), characterized in that the device (500) is designed to set at least one parameter differently when dressing the inner contour of the grinding wheel (200) than when dressing the outer contour of the grinding wheel ( 200).

Description

Field of the invention

The present invention relates to an apparatus and a method for dressing a grinding wheel designed for grinding workpieces in a grinding machine, wherein the cup-shaped grinding wheel during dressing with a rotary driven dresser is operably engageable.

 In particular, this is about cup-shaped grinding wheels, which are coated or coated so that they can be conditioned by means of a rotary driven dresser. The dressing of such grinding wheels is carried out by means of a motor-driven dressing wheel or roller (here called a dresser) which is coated with hard-material grains (for example diamonds). The dresser is brought into operative connection with the grinding wheel and a relative movement is predetermined in order to machine the relevant areas of the grinding wheel.

 A pot-shaped grinding wheel always has a convex grinding flank with a cone outer ring and a concave grinding flank with a conical inner ring. With conventional devices, a cup-shaped grinding wheel has hitherto been dressed by means of a dresser as follows. Typically, the dresser is arranged axially parallel to the axis of rotation of the cup grinding wheel during dressing. Both the inner cone and the cone outer ring of the grinding wheel are dressed. In the case of the convex grinding flank (here also referred to as outer contour), there is less interference during dressing than in the case of the concave grinding flank (here also referred to as inner contour).

There is a solution for dressing a grinding wheel, in which the axis of the dressing roller is not parallel to the grinding wheel axis and the dressing roller executed and hired so that the Anschmiegung should be similar inside and outside. Details are for example the book "Gleason bevel gear technology; Foundations of engineering science and state-of-the-art manufacturing processes for bevel gears ", Hermann J. Stadtfeld, expert Verlag, 2013, pages 370-371 , refer to.

It is known that the dressing process depends on the speed ratio between the grinding wheel and the dresser. There are publications that deal with the precise geometrical and technical details of dressing a cup wheel. As an example, here is the publication by N. Weßels to name under the title "Flexible bevel gear grinding with corundum in varied series production", reports from production engineering, WZL, RWTH Aachen, Volume 3/2009, pages 24-58, Shaker Verlag, Aachen, Germany, ISBN 978-3-8322-8441-1 took place.

 It is also known that the surface finish of concave tooth flanks and convex tooth flanks of a workpiece, which have been machined by grinding with a previously dressed cup wheel, may differ.

 It is now the task to change the surface quality of concave tooth flanks and convex tooth flanks of a workpiece by influencing the topography of a cup-shaped grinding wheel. In particular, it is about e.g. adapt the surface quality of the concave tooth flanks to the surface quality of the convex tooth flanks.

 According to the invention, the actual grinding process between the grinding wheel and the workpiece is not intervened, but the dressing of the cup-shaped grinding wheel is changed in order to fulfill the objective of the task. By the method and apparatus of the invention cup-shaped grinding wheels can be dressed so that the dynamic grain diameter can be adjusted for the inner contour and for the outer contour of the grinding wheel or can be selectively adjusted in relation to each other.

 The dynamic grain path radius in this context describes the movement of a point during dressing on the dresser relative to the movement of a point on the grinding wheel. By specifically adjusting the dynamic grain path radius for the inner contour and for the outer contour, grinding wheels can be dressed so that they produce the desired surface quality during subsequent grinding of the concave and convex tooth flanks of a workpiece.

Preferred embodiments of the invention are based on the finding that the grinding pattern on the tooth flanks is of particular importance for the running quality of a ground gear. For the In addition to the conditions of engagement when grinding with the grinding wheel, the grinding pattern also determines the topography and roughness of the grinding wheel. However, a special role also plays the mentioned dynamic grain radius, which is adjusted or specified according to the invention during dressing so that a desired grinding pattern can be achieved.

• • auf der inneren und äußeren Kontur der Schleifscheibe eine ähnliche (identische) Struktur erzeugt wird, die zu vergleichbaren erzeugten Rauheitswerten an konkaven und konvexen Zahnflanken des Werkstücks führt;
• • auf der inneren und äußeren Kontur der Schleifscheibe in Kombination mit den unterschiedlichen lokalen Abrichtzustellungen und Abrichtvorschüben, aus denen der lokale Überdeckungsgrad resultiert, gezielt eine ähnliche Struktur erzeugt wird, die, zu vergleichbaren erzeugten Rauheitswerten an konkaven und konvexen Zahnflanken des Werkstücks führt;
• • auf der inneren und äußeren Kontur der Schleifscheibe gezielt eine unterschiedliche Struktur erzeugt wird, die gezielt zu unterschiedlichen Rauheitswerten auf den konkaven und konvexen Zahnflanken des Werkstücks führt.

According to the invention, by a specific adaptation of the dressing parameters for the individual flanks of the grinding wheel, the dynamic grain path diameter of both flanks can be adjusted or adjusted in a targeted manner relative to one another such that

• A similar (identical) structure is produced on the inner and outer contour of the grinding wheel, resulting in comparable generated roughness values on concave and convex tooth flanks of the workpiece;
• On the inner and outer contour of the grinding wheel, in combination with the different local dressing feeds and dressing feeds, from which the local degree of coverage results, a similar structure is produced which results in comparable generated roughness values on concave and convex tooth flanks of the workpiece;
• • On the inner and outer contour of the grinding wheel targeted a different structure is generated, which leads specifically to different roughness values on the concave and convex tooth flanks of the workpiece.

 The invention makes it possible to provide a grinding wheel adapted to the particular application by the dressing process, which in turn results in a desired surface structure of the tooth flanks of a toothed wheel.

 The invention makes it possible not only to design the grinding process depending on the application, but also to optimize the dressing process so that it is particularly suitable for the respective grinding process. The invention offers the possibility of indirectly influencing the component properties or workpiece properties indirectly and nevertheless by the dressing process.

 The invention can also be applied to other machine concepts in which the dresser is not arranged axially parallel to the axis of rotation of the cup grinding wheel.

 The invention may be used in conjunction with the CD dressing process (continuous dressing) or the IPD dressing process (in-process dressing).

 The invention can be used in a (dressing) device into which the grinding wheel is introduced for dressing, or the invention can be used (in a secondary process) in grinding machines (grinding devices) in which a workpiece can be machined.

DRAWINGS

 An embodiment of the invention will be described in more detail below with reference to the drawings.

1A shows a schematic side view of an exemplary dresser;

1B shows a schematic sectional view of an exemplary cup-shaped grinding wheel;

2 shows a schematic sectional view of a portion of a cup grinding wheel, wherein an identical dresser is shown on both the inner contour and on the outer contour. The axes of rotation of the dresser and the grinding wheel are parallel.

3 shows a schematic end view of a portion of a cup grinding wheel, wherein both on the inner contour and on the outer contour depending on an identical dresser is shown. The axes of rotation of the dresser and the grinding wheel are parallel (here perpendicular to the drawing plane).

4 shows a schematic representation of a bevel gear grinding machine with axis designations and dressers;

5 shows an exemplary diagram in which the dynamic grain radius for inside and outside over the local grinding wheel diameter is plotted.

In the context of the present description, terms are used which are also used in relevant standards. It should be noted, however, that the use of these terms is for the convenience of understanding only. The inventive idea and the scope of the claims should not be limited by the specific choice of the terms in the interpretation. The invention can be readily applied to other conceptual systems and / or fields. In other fields the terms are to be applied analogously.

In the context of the invention is about cup-shaped grinding wheels 200 , An example is in 1B shown in schematic form. Such grinding wheels 200 are geometrically regarded as hollow cylinders that rotate about their axis R1. They have two conical grinding flanks forming a conical inner ring and a conical outer ring. The following are the outer contour of the grinding wheel 200 with the reference number 201 and the inner contour with the reference numeral 202 designated. The profile 203 the grinding wheel 200 can also be asymmetric. In 1B is a grinding wheel 200 with symmetrical profile 203 shown.

The device 100 (see eg 4 ) includes a dressing support 503 , with a device (eg in the form of a spindle 103 ) for picking up and turning a dresser 101 is provided. An example of a dresser 101 is in 1A shown in schematic form. The device (eg in the form of a spindle) for receiving and Drehantreiben the dresser 101 must be designed torsionally rigid, powerful and very precisely controllable. Details of this are well known, as many grinders with integrated dresser and also special (dressing) devices are available on the market today.

Preferably, in all embodiments, a dresser 101 used, which has the form of a roll or disc. The dresser 101 can also have a different shape as in 1A shown. The dresser 101 can be occupied eg with diamonds.

Because of the material removal associated with dressing on the grinding wheel 200 , is a precise path-controlled relative movement (for example, by a controller S specified) between the grinding wheel 200 and the dresser 101 required.

The device 100 therefore includes a controller S (preferably a CNC controller in all embodiments) and multiple axis drives. The control S, together with the axle drives, makes it possible to carry out the path-controlled relative movements of the dresser 101 in relation to the grinding wheel 200 , In the example of 4 is the dresser 101 stationary and is rotationally driven about a vertical axis R2 while the grinding wheel 200 is moved by the controller S path controlled. The axes R1 and R2 are (at least) parallel to each other in the moment shown.

• – das Verhältnis der Umfangsgeschwindigkeiten vS der Schleifscheibe 200 und vR des Abrichters 101 (Abrichtverhältnis q_d genannt);
• – den Abrichtbetrag;
• – die Abrichtgeschwindigkeit und den daraus resultierenden Überdeckungsgrad, der sich zwischen dem Abrichter 101 und der Schleifscheibe 200 ergibt.

The dressing process and thus the achieved grinding tool surface structure on the grinding wheel 200 are defined by:

• The ratio of the peripheral speeds vS of the grinding wheel 200 and vR of the dresser 101 (Dressing ratio q _d called);
• - the dressing amount;
• - The dressing speed and the resulting degree of overlap, which is between the dresser 101 and the grinding wheel 200 results.

The dressing ratio q _d is the quotient of the peripheral speeds v R of the dresser 101 and vS the grinding wheel 200 , as follows: qd = vR / vS (1)

The dressing can be done in synchronism with q _d > 0 and in the opposite direction with q _d <0. The dressing ratio q _d has a significant influence on the formation of cutting tracks or tracks of the individual diamonds of the dresser 101 on the grinding wheel 200 , By the dressing ratio q _d thus also the Wirkrautiefe the grinding wheel 200 affected. That is, the dressing ratio q _d has an influence on the abrasive tool surface structure.

When performing in synchronization, one typically operates with a q _d between 0.4 and 1.6, while in the opposite direction, one typically operates with a q _d between -0.5 and -1.2. A particularly low roughness of the tooth flanks of a ground workpiece 1 For example, you can reach it with a grinding wheel 200 which was trained in the mating with a q _d between -0.6 and -0.8. Good surfaces at especially good economy can be achieved, for example, with a grinding wheel 200 , which was dressed in synchronism with a q _d between 0.6 and 0.7.

 However, the present invention can not be applied only in these parameter windows.

Preferably, in all embodiments, a specifically selected, constant dressing ratio q _{d is} used. However, a continuous adaptation of the dressing ratio q _{d is also} possible.

It is important that due to geometric conditions when specifying an operative connection between the dresser 101 and the grinding wheel 200 Differences in the dressing contact between the dresser 101 and the two conical grinding flanks (outer contour 201 and inner contour 202 ) of the grinding wheel 200 result.

2 shows a schematic sectional view of a portion of a cup grinding wheel 200 , where both on the inner contour 202 as well as on the outer contour 201 one identical dresser each 101 are shown. The cup grinding wheel 200 is arranged here hanging with vertical axis of rotation R1 (as well as in 4 ). The axis of rotation R2 of the dresser 101 and the rotation axis R1 of the grinding wheel 200 run parallel (at least) in the moment shown. The two conical grinding flanks (outer contour 201 and inner contour 202 ) have different flank angles φ _s . The different flank angles φ _{s of} the two grinding flanks lead to different local dressing adjustments a _ed at the grinding flanks (see 2 ). The dressing feed a _ed is a function of the dressing amount a _d and the flank angle φ _{s of} the respective grinding flank of the grinding wheel 200 , The dressing feed a _ed determines the actual amount of transfer at the grinding flank in the normal direction. The following applies: a _ed = a _d × sin φ _s (2)

Together with the convex-convex contact (when dressing the outer contour 201 the grinding wheel 200 ) and the concave-convex contact (when dressing the inner contour 202 the grinding wheel 200 This leads to significantly different effective dressing _{roller diameters} d _eqd on the outer contour 201 and on the inner contour 202 , In addition, different geometric contact _lengths l _{gd result} (see 3 ).

3 shows a schematic end view of a part of a cup grinding wheel 200 (viewed in the axial direction), both on the inner contour 202 as well as on the outer contour 201 one identical dresser each 101 are shown. The axes of rotation of the dresser R2 and the grinding wheel R1 are parallel (they are perpendicular to the plane of the drawing).

The equivalent dressing _{roll diameter} d _{eqd, outside} on the outer contour 201 can be determined as follows:

The equivalent dressing _{roll diameter} d _{eqd, inside} on the inner contour 202 can be determined as follows:

From these two equations (3a) and (3b) it can be seen that the equivalent dressing _{roll diameter} d _{eqd, outside is} smaller than the dressing _{roll diameter} d _{eqd, inside} . This is due to the fact that two convex surfaces touch outside, while inside a convex surface with a concave surface touch. From the front view of the 3 It can be seen that correspondingly inside the contact _length l _{gd, inside is} greater than the contact _length l _{gd, outside the} outside. These contact lengths are in 3 purely schematically represented by tangentially arranged double arrows of different lengths. It should also be noted that the respective diameter inside and outside with the height position (profile height called) of the dresser 101 opposite the grinding wheel 200 changed. That's because the profile 203 the grinding wheel 200 conical contours 201 . 202 Has.

It becomes clear from these considerations that the contact conditions between dressers 101 and grinding wheel 200 due to the geometric conditions and due to process parameters clearly distinguish between the inner profile and the outer profile. In addition, these contact conditions are dependent on the position of the dresser 101 relative to the grinding wheel 200 dynamically changeable.

These different geometrical conditions result in different surface structures of the grinding wheel 200 , These different surface structures produce different roughness on the tooth flanks of the gears to be ground (workpieces 1 ). Mostly the produced surface quality is at the outer contour 201 the grinding wheel 200 worse than on the inner contour 202 , This is partly due to the fact that the outer contour 201 a smaller equivalent Abrichtrollendurchmesser d _{eqd, outside} than the inner contour 202 ,

Another parameter that plays a role in dressing is the degree of coverage u _d . The coverage degree u _d is defined as follows, where a _{pd is} the engagement width of the dresser 101 and s _d the dressing feed are:

The degree of coverage u _d describes how tight the individual tracks of the dressing on the contour 201 . 202 the grinding wheel 200 resulting feed spirals lie against each other. The dressing feed s _d is proportional to the dressing feed rate and inversely proportional to the speed of the grinding wheel 200 , An overlap degree u _d <1 describes a non-overlapping, spirally encircling dressing track on the grinding tool 200 , For a u _d <1, not the entire surface of the grinding tool will be 200 trained, but the surface is covered with individual (dressing) traces.

However, the previous consideration is not complete, since here the so-called dynamic grain path radius d _{dnd is} not taken into account. The dynamic grain path radius d _dnd describes, as already mentioned, the movement of a point (or diamond) on the dresser 101 relative to the movement of a point (or grain) on the grinding wheel 200 , In addition to the effective dressing _{roll diameter} d _{eqd, the} dynamic grain path radius d _dnd is additionally influenced by the dressing _ratio q _d . Mathematically, the dynamic grain orbit radius d _dnd can be defined as follows:

From this equation (5) one can derive the following special cases: q _{d dnd} 0 (standing dresser) ∞ 1 0

The equation (5) shows that the particle orbit radius d _dnd is a function which has a function of the effective Abrichtrollendurchmesser d _eqd and the Abrichtverhältnis q _d. From the equations (3a) and (3b), it can be seen that the effective dressing _roller diameters d _{eqd are quantities} that are _different from the diameter d _{R of} the dresser 101 and the diameter d _{S of} the grinding wheel 200 be determined. However, these quantities are not constant, since, for example, the actual diameter of the outer contour 201 the grinding wheel 200 reduced because of penetration into the material of the grinding wheel 200 Material is removed. The actual diameter of the inner contour 202 the grinding wheel 200 on the other hand, it gets bigger as material is also removed during dressing. Added to this is the reduction of the circumference of the dresser 101 that results when dressing. In 2 is the original contour of the profile 203 the grinding wheel 200 shown in original condition by a dashed line. The contour of the profile 203 the grinding wheel 200 in the actual state currently shown is represented by a solid polyline. The position of the outer contour is in the current state with the reference numeral 201 * and the position of the inner contour by the reference numeral 202 * , The area between the outer contour and the actual contour is the penetration area of the grinding wheel 200 in their material the dresser 101 has penetrated.

However, these diameters d _R and d _S are also, as already mentioned, a constant change during the dresser 101 along the profile 203 to be led. Based on 2 it can be seen that the diameter d _{S, inside of} the grinding wheel 200 gets smaller when the dresser 101 parallel to the axis R1 is moved up (which is a deeper immersion into the interior of the cup grinding wheel 200 corresponds). If the dresser 101 parallel to the axis R1 is moved down (causing a move out of the inside of the cup grinding wheel 200 corresponds), so the diameter d _{S, inside} larger. The diameter d _{S, outside} changes accordingly, with an asymmetrical profile here 203 the conicity is different inside than outside.

However, the equation (5) also shows that the grain path radius d _dnd represents a function, which additionally has a function of the Abrichtverhältnis q _d. Equation (1) states that the dressing ratio q _{d is} proportional to the peripheral speed v R of the dresser 101 and inversely proportional to the peripheral speed vS of the grinding wheel 200 is.

The grain path radius d _dnd is thus a function that dynamically changes during dressing.

• A1. Erzeugen einer identischen oder nahezu gleichen Oberflächenstruktur auf der Innenkontur 202 und der Aussenkontur 201 der Schleifscheibe 200.
• A2. Auf der Innenkontur 202 und der Aussenkontur 201 der Schleifscheibe 200 in Kombination mit den unterschiedlichen lokalen Abrichtzustellungen und Abrichtvorschüben s_d, aus denen der sogenannte lokale Überdeckungsgrad u_d resultiert, gezielt eine identische oder nahezu gleiche Oberflächenstruktur erzeugen, die zu vergleichbaren erzeugten Rauheitswerten an beiden konvexen und konkaven Zahnflanken einer Zahnlücke eines Werkstücks (Zahnrad) führt.
• A3. Auf der Innenkontur 202 und der Aussenkontur 201 der Schleifscheibe 200 gezielt eine unterschiedliche Oberflächenstruktur erzeugen, die gezielt zu unterschiedlichen Rauheitswerten an beiden Zahnflanken einer Zahnlücke eines Werkstücks (Zahnrad) führt.

The invention is based on the approach to make the parameters that affect the dressing geometrically and / or technologically, specifically to make changeable. The targeted adaptation of these parameters can be used for dressing the inner contour 202 other conditions are given than for the outer contour 201 , Here are the following cases / situations:

• A1. Generating an identical or nearly identical surface structure on the inner contour 202 and the outer contour 201 the grinding wheel 200 ,
• A2. On the inner contour 202 and the outer contour 201 the grinding wheel 200 in combination with the different local Abrichtzustellungen and Abrichtvorschüben s _d , which results in the so-called local coverage u _d produce targeted an identical or almost identical surface structure, which leads to comparable roughness generated on both convex and concave tooth flanks of a tooth gap of a workpiece (gear) ,
• A3. On the inner contour 202 and the outer contour 201 the grinding wheel 200 selectively generate a different surface structure that leads specifically to different roughness values on both tooth flanks of a tooth gap of a workpiece (gear).

If you want, for example, according to the case A1, the dynamic grain radius d _dnd for the inner contour 202 the same as for the outer contour 202 , then: d _{dnd, inside} = d _{dnd, outside} (6)

Equation (3b) states that the equivalent dressing _{roll diameter} d _{eqd is inside} the inner contour 202 permanently changes, since the actual diameter of the inner contour 202 the grinding wheel 200 with penetration into the material of the grinding wheel 200 gets bigger. The equivalent dressing _{roll diameter} d _{eqd, outside} on the outer contour 202 also changes permanently, because the actual diameter of the outer contour 202 with penetration into the material of the grinding wheel 200 gets smaller. Calculations show that with increasing time both values d _{eqd, inside} and d _{eqd, outside become} smaller (if one of these values on a certain profile height of the profile 203 the grinding wheel 200 considered), wherein the difference between these two sizes does not remain constant but is also subject to change.

The diameter d _R, however, can be assumed to be constant in a first approximation that the dresser 101 is designed significantly harder and therefore shows less wear.

The changes of the two values d _{eqd, inside} and d _{eqd, outside} can not be directly through the device 100 , respectively by the controller S of this device 100 to be influenced. In equation (5), however, the dressing ratio q _{d can be} influenced. This can be done by looking at the peripheral speeds vR of the dresser 101 and vS the grinding wheel 200 dynamically governs to satisfy the condition of equation (6). Here again, it should be noted that the circumferential speeds vR and vS also have a dependency on the respective actual diameter. If the diameter d _{R is} assumed to be constant for a first approximation (for the reasons indicated above), then the peripheral velocities v R directly follow the angular velocity of the dresser 101 that from the device 100 , respectively by the controller S of this device 100 , is specified. On the one hand, the peripheral speed vS depends on the instantaneous angular velocity of the grinding wheel 200 and on the other hand from the current diameter (inside or outside).

 Preferably, the controller S is designed in all embodiments so that it is able to determine and specify the parameters during dressing according to the predetermined case A1, A2 or A3.

In the simplest case, the parameters are determined and for the subsequent dressing of a grinding wheel 200 fixed (unchangeable) given. That is, in this case, the controller S controls the dressing based on previously determined and set parameters. That is, the web-guided relative movement of grinding wheel 200 and dresser 101 , and the peripheral speed vR and / or vS are controlled by the controller S based on previously determined and determined parameters.

 However, particularly preferred embodiments are those in which the kinematic dressing parameters are designed as dynamic parameters that are changed stepwise or continuously during dressing based on the continuous change of the dynamic grain path radius to meet the specifications (A1, A2 or A3, as the case may be) ,

5 shows an exemplary diagram in which the dynamic grain radius for inside d _{dnd, inside} and outside d _{dnd, outside} the local grinding wheel diameter (diameter d _{S, inside} and d _{S, outside of} the grinding wheel 200 ) is applied. The curve shown in solid form represents the course of the grain path radius d _{dnd, inside} , while the dashed curve represents the course of the grain path radius d _{dnd, outside} .

An exemplary CNC-controlled spiral bevel grinding machine 500 is in 4 shown. The grinding machine 500 has in the example shown a vertically suspended grinding spindle 102 (A1 axis). The workpiece to be machined 1 sits on the B axis. The dresser 101 sits on another vertical spindle 103 on a dressing support 503 is arranged. Furthermore, several linear axes X, Y and Z are provided. The controller S is shown in schematic form as an external switching block which is connected via a communication link 504 with the machine 500 connected is. This arrangement is to be understood as an example.

Preferably, in all embodiments of the invention, the controller S is designed as a programmable (CNC) controller S such that a constant dressing ratio q _{d can be} predetermined for the dressing. However, in all embodiments, the dressing ratio q _d for dressing can also be set to a variable value.

Preferably, in all embodiments of the invention, the controller S is designed as a programmable (CNC) controller S such that a first dynamic grain path radius d _dnd for dressing the inner contour 202 and a second dynamic grain path radius d _dnd for dressing the outer contour 201 can be specified.

The first dynamic grain path radius d _dnd for dressing the inner contour 202 may be identical or nearly identical to the second dynamic grain radius d _dnd for dressing the outer contour 201 ,

The first dynamic grain path radius d _dnd and / or the second dynamic grain path radius d _dnd can / can be variably predefinable.

 In order to specify the parameters or to program the controller S, an interface (for example a touch-sensitive screen) can be used in a known manner (not shown).

The invention described herein can also be practiced on other grinding machines. Or she can in a device 100 are used, especially for dressing a grinding wheel 200 is designed. Also such a device 100 includes the required axle drives and a (preferably programmable) controller S. workpiece 1 contraption 100 trainer 101 first spindle / grinding spindle 102 second spindle 103 cup-shaped grinding wheel 200 outer contour 201 Actual outer contour 201 * inner contour 202 Actual inner contour 202 * profile 203 workpiece 300 grinding machine 400 contraption 500 Abrichtsupport 503 communication link 504 Dressing amount a _d Dressing a _ed Abrichtverhältnis q _d Equivalent dressing roll diameter d _eqd dynamic grain path radius _dnd Diameter of the dresser d _R Outer diameter of the grinding wheel d _{S, outside} Inner diameter of the grinding wheel d _{s, inside} Contact length outside l _{gd, outside} Contact length in l _{gd, inside} Rotation axis of the grinding wheel R1 Rotation axis of the dresser R2 control S Profile angle of the grinding wheel φ _s Contact ratio you Peripheral speeds of the dresser vR Peripheral speeds of the grinding wheel vS linear axes X, Y, Z

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• "Gleason bevel gear technology; Fundamentals of engineering science and state-of-the-art manufacturing processes for bevel gears ", Hermann J. Stadtfeld, expert Verlag, 2013, pages 370-371 [0004]
• "Flexible bevel gear grinding with corundum in variant-rich series production", reports from production engineering, WZL, RWTH Aachen, Volume 3/2009, pages 24-58, Shaker Verlag, Aachen, Germany, ISBN 978-3-8322-8441-1 [0005]

Claims (15)

Contraption ( 100 . 500 ) for dressing a cup-shaped grinding wheel ( 200 ), which has an inner contour ( 202 ) and an outer contour ( 201 ) for grinding workpieces ( 300 ) in a grinding machine ( 400 ), the device ( 100 . 500 ) a first spindle ( 102 ) for receiving and Drehantreiben the grinding wheel ( 200 ) and a second spindle ( 103 ) for picking up and turning a dresser ( 101 ), and a control (S) and axle drives for relative movement of the grinding wheel ( 200 ) in relation to the dresser ( 101 ) during dressing of the dressers ( 101 ) in operative connection with the grinding wheel ( 200 ), characterized in that the device ( 100 . 500 ) is designed for dressing the inner contour ( 202 ) of the grinding wheel ( 200 ) at least one parameter other than when dressing the outer contour ( 201 ) of the grinding wheel ( 200 ). Contraption ( 100 . 500 ) according to claim 1, characterized in that the dressing factor (q _d ) is a predefinable parameter, wherein preferably the dressing factor (q _d ) during dressing of the inner contour ( 202 ) is greater than the dressing factor (q _d ) when dressing the outer contour ( 201 ). Contraption ( 100 . 500 ) according to claim 1, characterized in that for the dressing of the inner contour ( 202 ) a first parameter and for the dressing of the outer contour ( 201 ), a second parameter can be predetermined, wherein the first parameter of the second parameter is unsuccessful. Contraption ( 100 . 500 ) according to claim 3, characterized in that during the dressing of the inner contour ( 202 ) the first parameter and / or during the dressing of the outer contour ( 201 ) the second parameter are changeable. Contraption ( 100 . 500 ) according to claim 1 or 2, characterized in that during dressing of the inner contour ( 202 ) a different dynamic grain radius (d _dnd ) can be specified than when dressing the outer contour ( 201 ), where the dynamic grain radius (d _dnd ) is the movement of a point on the dresser ( 101 ) relative to the movement of a point on the grinding wheel ( 200 ) describes. Contraption ( 100 . 500 ) according to claim 1, 2, 3 or 4, characterized in that in addition at least one of the following values is a predefinable parameter: - the local dressing delivery and / or - the local dressing advance and / or - the local coverage (u _d ). Contraption ( 100 . 500 ) according to one of the preceding claims, characterized in that the controller (S) as a programmable controller (S) is designed so that a first dynamic grain radius (d _dnd ) for the dressing of the inner contour ( 202 ) and a second dynamic grain path radius (d _dnd ) for dressing the outer contour ( 201 ) can be specified. Contraption ( 100 . 500 ) according to claim 7, characterized in that during the dressing of the inner contour ( 202 ) the first dynamic grain radius (d _dnd ) and / or during the dressing of the outer contour ( 201 ) the second dynamic grain radius (d _dnd ) are variable. Contraption ( 100 . 500 ) according to claim 7, characterized in that the first dynamic grain radius (d _dnd ) and / or the second dynamic grain radius (d _dnd ) as a function of at least one further value can be predetermined. Contraption ( 100 . 500 ) according to one of the preceding claims, characterized in that it is a dressing device into which the grinding wheel ( 200 ) can be introduced for dressing. Contraption ( 100 . 500 ) according to one of the preceding claims 1 to 10, characterized in that it is a dressing device which can be used in a grinding machine, wherein the grinding machine for grinding a workpiece with the grinding wheel ( 200 ) is designed. Method of dressing a cup-shaped grinding wheel ( 200 ) with a dresser ( 101 ), whereby the grinding wheel ( 200 ) an inner contour ( 202 ) and an outer contour ( 201 ) for grinding workpieces ( 300 ) in a grinding machine ( 400 ), comprising the steps of: - rotating the grinding wheel ( 200 ) about a first axis of rotation (R1), - rotational driving of the dresser ( 101 ) about a second axis of rotation (R2), - Specifying a first parameter for dressing the inner contour ( 202 ), - specifying a second parameter for dressing the outer contour ( 201 ), whereby the first parameter differs from the second parameter, - path-controlled movement of the grinding wheel ( 200 ) in relation to the dresser ( 101 ) to the inner contour ( 202 ) and the outer contour ( 201 ) for dressing with the dresser ( 101 ), wherein the first parameter when dressing the inner contour ( 202 ) and the second parameter when dressing the outer contour ( 201 ) be applied. A method according to claim 12, characterized in that the dressing factor (q _d ) will specify as a parameter, wherein preferably the dressing factor (q _d ) during dressing of the inner contour ( 202 ) is greater than the dressing factor (q _d ) when dressing the outer contour ( 201 ). A method according to claim 12 or 13, characterized in that during the path-controlled moving when dressing the inner contour ( 202 ) the first parameter and / or during the path-controlled movement when dressing the outer contour ( 201 ) the second parameter are changeable. Method according to claim 12 or 13, characterized in that during dressing of the inner contour ( 202 ) a different dynamic grain radius (d _dnd ) can be specified than when dressing the outer contour ( 201 ), where the dynamic grain radius (d _dnd ) is the movement of a point on the dresser ( 101 ) relative to the movement of a point on the grinding wheel ( 200 ) describes.

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