DE3519050A1 - Method and control arrangement for setting a gear-shaped workpiece - Google Patents

Abstract

The invention relates to the setting of a gear-shaped workpiece on a tooth-flank grinding machine. The aim of the invention is to eliminate control manipulations which are to be carried out manually. The object of successively moving the grinding body from any initial position relative to the workpiece into a defined end position is achieved without the need for transducers arranged in the work space. The essence of the invention consists in the fact that the grinding body is moved relative to the workpiece, during which radial feed adjustments of the grinding body and rotary movements of the workpiece alternate with one another, into a defined end position at the tooth root of a tooth gap. The changes in direction during the relative movement are initiated by the varying power consumption of the motor of the grinding body. The varying power consumption arises during the approximately graduated movement performed at least along one tooth flank. The invention can be used in the tooth-flank grinding of gear-shaped workpieces. <IMAGE>

Description

Method and control arrangement for setting up a tooth

wheel-shaped workpiece The field of application of the invention is Setting up a gear-shaped workpiece on a tooth flank grinding machine with a rotary feed of the workpiece or tangential feed of the workpiece or grinding wheel with single-flank grinding, a radial infeed of the grinding wheel with two-flank grinding, the radial infeed being triggered by a start signal * the center of the workpiece is almost an extension of the center line of the grinding tool and the infeed positions of the starting points of the edges are saved.

A positioning device is already from the patent DD 0153196 known for grinding wheel and gear on tooth flank grinding machines that set up of the grinding wheel with respect to a tooth gap of the gear, means of a slow rolling movement and a simultaneous continuous infeed movement the relative position between the tooth gap and that in it becomes as far as predetermined Deep immersed grinding wheel is extended until the grinding wheel has a Tooth flank touched The contact is made by means of an optical or acoustic sensor signaled or perceived by an operator; the then one Button pressed. This is the reached position of the feed drive in one Computer saved. This is followed by the same process for the second tooth flank at. A middle position is created from the two stored touch positions calculated as the starting position of the grinding tool for the subsequent tooth flank grinding is usable.

The disadvantage of the proposed solution is that the operator does the necessary Must make rough positioning of the tooth gap to the grinding wheel. This solution is thus not fully automatable and not for a fully automatic one sequence suitable for tooth flank grinding.

It has already been suggested for positioning the workpiece to use a measuring control opposite the grinding wheel, with the encoder in the direction the bed slide movement is arranged next to the grinding wheel. If one assumes that to eliminate the thermal changes in position of the grinding wheel the positioning is dressed, the following disadvantages remain: The proposed The measuring device only includes probing the tooth gap and the tooth gap center It does not include determining the left and right game display and the radial Positioning, so this proposal is not for a fully automatic either Work sequence suitable for tooth flank grinding. In addition, when changing the Diamonds the measurement control are readjusted From DE-OS 27 17 517 is still an indexing device for adjusting the position of gears known that one aligned radially to the gear and by means of auxiliary power in this radial direction Includes moveable index pen.

If the random position of the gearwheel shows that the index pin is in the Course of the radial movement first on the tooth tip surface instead of on a tooth gap hits, it is briefly withdrawn by an assistant and the gear is tightened rotated a predetermined amount and released the clamping device again.

The two cases of the first contact of the index pin with the tooth tip surface and an index pin with a tooth flank differs from an adjustable limit switch Cam.

This solution has the disadvantages of being able to distinguish manual adjustment must be made in both cases mentioned. These The setting must be renewed for different workpiece diameters and If necessary, extends beyond the cams to the limit switch itself. This solution, too, is therefore in favor of incorporating the set-up into an automated one Tooth flank grinding process unsuitable.

Finally, radio controls are already known. They are based on that the infeed of a rotating grinding wheel with respect to a workpiece ends as soon as both touch each other. As a result of the touch, the Grinding body motor nahxew its active power consumption what by means of a threshold switch is determined for the active power variable.

In the context of such calls, it is also from DE-OS 20 04 911 already known, the contact triggered the delivery from a rapid feed to switch to a work feed.

The aim of the invention is to achieve that the manual execution There are no operator actions during setup.

Those described in the characteristics of the known technical solutions Deficiencies are caused by the lack of orientation towards the involvement of the furnishing in an automated process of tooth flank grinding To eliminate this cause, The invention is based on the object of a method and a control arrangement for setting up a gear-shaped work piece on a tooth flank grinding machine with a rotary infeed of the work piece or tangential infeed of the workpiece or grinding wheel for single-flank grinding, a radial infeed of the grinding wheel for tooth flank grinding, the radial infeed being triggered by a start signal the center of the workpiece is almost an extension of the center line of the grinding tool is located, the infeed positions of the starting points of the edges are saved and in the control arrangement a first drive for the radial infeed of the grinding wheel a measuring system, a first power switch and a first direction changer, one second drive for the rotary movement of a rotary table on which the workpiece is clamped is. a measurement system, a memory, a second power switch and a second Direction switch are assigned. using a sparkly responsive first threshold switch, which controls the first power switch, to be designed in such a way that the grinding wheel successively from any initial position relative to the workpiece is brought into a defined end position.

According to the invention this is achieved in that the grinding wheel is dependent stopped by a predetermined first cutting force in the radial infeed and the workpiece is rotated, the workpiece either immediately depending on a second Cutting force, which is smaller than the first cutting force, stopped in the rotary movement and the grinding wheel is advanced again radially, depending on the workpiece from a predetermined third cutting force; which is greater than the first cutting force, is reversed in the rotary movement that the radial infeed of the grinding wheel and the rotational movement of the workpiece triggered as a function of the first cutting force be carried out in continuous change along a tooth flank, the radial infeed is ended when the radial target position is reached, the start position of the first flank is present when the third cutting force after reaching the radial Position is reached for the first time, the start position of the second edge is present and the sparking is stopped when the third cutting force reaches the second time is.

The control arrangement is characterized in that a second Threshold switch, a first gate, a second gate, an inverter, a first OR element, a second OR gate and a counter with the counting positions zero to three are provided are, the input of the second threshold switch parallel to the input of the first Threshold switch is arranged, the switching threshold of the second threshold switch is set higher than the switching threshold of the first threshold switch that Output of the first threshold switch via the inverter and the first gate with the Control input of the first power switch and parallel to it with the first input of the first OD-R element is connected, the output of the first OR element is connected to the control input of the second power switch via the second gate, the second threshold switch on the output side with the control inputs of the second Direction switch, the memory and the counter is connected, the output of the Counter with the control input of the second gate and the first input of the second OR gate connected is the output of the measuring system for the radial position with the second input of the first OR gate and the second input of the second OR gate is connected, the output of the second OR gate with the control input of the first gate is connected and the measuring system for the rotational position of the workpiece connected to the storage.

The solution according to the invention brings the rotating grinding wheel in the radial target position, transmits successively to both edges and saves them Start positions of the two flanks.

The solution according to the invention is explained below using an exemplary embodiment described in more detail. The figure shows the control arrangement for carrying out the method in a schematic representation.

A tooth flank grinding machine, not shown, includes a Bed slide 1 carrying a rotary table 2 on which a gear 3 is clamped is. The rotational movement of a grinding wheel 4 is driven by a direct current motor 5 generated, which is connected to a power supply via a switch 6 and thereby consuming a power corresponding to the respective load, which is consumed by a Performance aesser 7 is recorded.

A first drive, which has a first motor 8 with a radial measuring system 9 and contains a screw drive 10 is for the radial infeed of the grinding wheel 4 is provided with respect to the gear 3. In the supply line to the motor 8 are a first Mains switch 11 and a first direction switch 12 are arranged.

A second drive to which a second motor 13 with a measuring system for the rotational position of the workpiece 14 and a worm gear 15 are concerned the rotary movement of the rotary table 2. The second motor 13 is a second power switch 16 and a second direction switch 17 connected upstream.

A first threshold value switch is located on the power meter 7 in parallel 18 and a second threshold switch 19 connected. The outcome of the first Threshold switch 18 is via an inverter 20 and a first gate 21 with the Control input of the first power switch 11 and in parallel with the first input of the first OR gate 22 connected. The output of the first OR gate 22 is connected to the control input of the second power switch 16 via a second gate 23.

The control inputs are at the output of the second threshold switch 19 of the second directional switch 17+ of the counter 24 and the memory 25 connected. At the output of the counter 24 is the control input of the second gate 23 and parallel connected to the first input of the second OR gate 26.

At the output of the measuring system for the radial position 9 are the second Input of the second OR gate 26 and, in parallel, the second input of the first OR gate 22 connected. The control input is at the output of the second OR gate 26 of the first gate 21 connected.

The measuring system for the rotational position of the workpiece 14 is with the Memory 25 connected.

The counter 24 is set so that it is with single-flank grinding at counting position three and with two-flank grinding a signal is given in counting position two issues.

In addition, the first direction of rotation of the workpiece is the same as grinding.

How the control works when grinding in single-flank grinding is as follows: The radio control is activated with an on-switch that is not shown activated. The counter 24 is at the counting position zero.

When the switch 6 is inserted, the grinding wheel 4 rotates, the assumes a starting position removed from the gear 3. The performance tester 7 gives an analog signal that maps the no-load power of the grinding wheel 4.

The switching threshold of the second threshold switch 19 is higher set as the switching threshold of the first threshold switch 18, this in turn higher than the said analog signal. Both threshold switches 18 and 19 remain for the time being in their starting position and emit an O-signal. The second power switch 16 is not activated and is open. The second drive stands still.

Since the inverter 21 outputs a low signal, it becomes the first power switch 11 activated and closed.

The first drive puts the grinding wheel 4 in the direction of the gear 3 to.

When sparking off, the power consumed by the grinding wheel 4 increases compared to the previous idle power.

The analog signal emitted by the power meter 7 rises and leaves switch the first threshold switch 18 on the output side from O-Slgaal to L-signal. As a result, the first power switch 11 is opened and the second power switch 16 is closed. The radial infeed is ended and instead a rotary movement of the rotary table 2 initiated together with the spanned gear 3.

A distinction must be made between two possible cases for the further process, which depend on the direction of the first rotary movement of the rotary table 2.

As a first case it should be assumed that the rotational movement initiated of the rotary table 2 has the direction in which the touched tooth flank is still is pressed more against the grinding wheel 4. The ones from the rotating grinding wheel 4 consumed power increases even more, so that the second threshold switch 19 responds.

Its output signal acts on the second direction switch 17, which switches the rotary movement of the rotary table 2 in the opposite direction. At the same time, the counter 24 is brought into the counting position "one". I will continue the memory 25 is activated and the rotary position is stored. This value will be later overwritten.

By changing the direction of the rotary movement of the rotary table 2 removes the gear 3 from the grinding body 4 in approximately tangential Direction. The power meter 7 outputs a signal that again indicates the idle power of the grinding wheel 4 corresponds, both threshold switches 18 and 19 toggle into their Return to the starting position and issue an O signal. The second power switch 16 is opened and the first power switch 11 closed again. It sets a new one Radial infeed of the grinding body 4 with respect to the gear 3.

From now on, a sequence of movements occurs in which a radial infeed occurs of the grinding wheel 4 and a rotary movement of the rotary table 2 in the last-mentioned Alternate direction. The distances covered are at the distance of the upper and hysteresis-related lower response threshold of the first threshold switch 18 in Relation to the output signal level of the ventilation meter7 at no-load power. There is an approximately step-shaped relative movement between the grinding body 4 and the gear 3, which runs along a tooth flank. Reached the grinding wheel 4 the radial nominal position, then the measuring system for the radial position 9 an L signal. As a result, the first port 21 and thus the first power switch 11 opened and via the first OR gate 22 and the second gate 23 of the power switch 16 closed. This switches off the radial infeed and the rotary movement switched on although the first cutting force has not been reached. This will make the The workpiece flank is moved towards the grinding wheel, which corresponds to the adjacent flank in the Table gear belongs.

When the third cutting force is reached, the second threshold switch is activated 19 activated. As a result, the memory 25 is activated, the counter 24 to "two" switched and the second direction switch 17 switched. This causes a Saving the first rotational position of the workpiece 3 for the flank that has been spotted and a change in workpiece rotation.

When the second cutting force is reached again, the second threshold switch 19 activated. The memory 25 is activated as a result and the second rotational position of the workpiece 3 is stored for this sparked flank. Furthermore, the counter 24 is switched to "three". At "three" the counter gives 24 an L signal.

This opens the second gate 23 and the rotational movement of the workpiece switched off. The calling process is finished.

The second case is that the initiated rotary movement of the rotary table 2 has the direction in which the tooth flank touched by the grinding wheel 4 is moved away. In contrast to the first case, the sequence of movements already occurs from now on on, in which there is a radial infeed of the grinding wheel 4 and a rotary movement of the rotary table 2 alternate in the manner previously described. The second threshold switch 19 is activated the first time when the grinding wheel 4 at the tooth base is the opposite Tooth flank touches. Until the shutdown of all three drives is compared to In the first case one more change of direction when moving between the two tooth flanks executed along the tooth base, meets the grinding body 4 at the beginning of the setup process on a tooth tip surface, then there is also the second case because the one introduced Rotary movement of the rotary table 2 has that direction in which the touched Tooth flank is moved away from the grinding wheel.

How the control works when grinding with two flanks is partly different.

The set rotation of the workpiece agrees with the direction of rotation when grinding, the sequence of the sparking process is up to the alternating radial Infeed and turning of the workpiece when touching a flank are the same.

If the second flank comes into contact, the cutting force increases until the third cutting force is reached. This becomes the second threshold value switch 19 activated.

6 counter 24 outputs an L signal when the number is "one". Through this the second gate 23 and via the second OR gate 26 the first gate 21 are closed.

This enables the rotation of the workpiece and the radial infeed switched off. In addition, the memory 25 is activated and the rotational position of the workpiece saved. This ends the setup process.

List of the reference symbols used 1 - bed slide 2 - rotary table 3 - gear 4 - grinding wheel 5 - DC motor 6 - switch 7 - power meter 8 - Motor 9 - Measuring system for the radial position of the grinding tool 10 - Screws rubbed 11 - power switch 12 - direction switch 13 - motor 14 - measuring system for the Rotational position of the workpiece 15 - worm drive 16 - power switch 17 - direction switch 18 - Threshold switch 19 - Threshold switch 20 - Negator 21 - Gate 22 - OR gate 23 - Gate 24 - Counter 25 - Memory 26 - OR element

Claims (2)

Method and control arrangement for setting up a gear-wheel-shaped Workpiece Claims 1. A method for setting up a gear-shaped workpiece on a tooth flank grinding machine with a rotary feed of the workpiece or tangential infeed of the workpiece or grinding tool for single-flank grinding. a radial infeed of the grinding wheel. Two flank bevel with the radial infeed is triggered by a start signal, the workpiece center is almost in extension the center line of the grinding tool and the infeed positions of the starting points the edges are stored, characterized in that; that the grinding wheel depends stopped by a predetermined first cutting force in the radial infeed and the workpiece is rotated, the workpiece either immediately depending on a second Cutting force. which is smaller than the first cutting force, stopped in the rotary movement and the grinding wheel is advanced again radially, depending on the workpiece from a predetermined third cutting force which is greater than the first cutting force, reversed in the rotary movement, that the radial infeed of the grinding tool and the one triggered as a function of the first cutting force Rotary movement of the workpiece made in continuous change along a tooth flank the radial infeed is ended when the radial target position is reached is. the start position of the first flank is present when the third cutting force is reached the first time after reaching the radial position; the address the second flank is present and the spotting is terminated when the third cutting force the second time is reached. 2. Control arrangement for performing the method according to claim 1 being a. first drive for the radial infeed of the grinding wheel a measuring system, a first power switch and a first direction switch4 to a second drive for the rotary movement of a rotary table on which the workpiece is clamped, a measuring system, a memory, a second power switch and a second directional switch assigned; using a first threshold switch that responds to a spark, which controls the first power switch, characterized in that a second threshold switch (19), a first gate (21) and a second gate (23), an inverter (20), a first OR gate (22), a second 00ER gate (26) and a counter (24) with the counting positions Zero to three are provided, the input of the second threshold switch (19) is arranged parallel to the input of the first threshold switch (18), the switching threshold of the second threshold switch (19) is higher than the switching threshold of the first threshold switch (18) the output of the first threshold switch (18) is set via the Inverter (20) and the first gate (21) with the control input of the first power switch (11) and connected in parallel to the first input of the first OR gate (22) is the outcome of the first OR gate (22) over the second gate (23) is connected to the control input of the second power switch (16) * the second Threshold switch (19) on the output side with the control inputs of the second direction switch (17). the memory (25) and the counter (24) are connected; the output of the counter (24) with the control input of the second gate (23) and the first input of the second oDeR member (26) is connected * the output of the measuring system for the radial position (9) with the second input of the first OR gate (22) and the second input of the second OR gate (26) is connected, the output of the second OR gate (26) is connected to the control input of the first gate (21) and the measuring system for the rotational position of the workpiece (14) is connected to the memory (25).