JP2792401B2 - Control device for multi-axis grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the improvement of machining accuracy in the grinding of a work, and more particularly, to a method having a plurality of work chuck shafts, each of which holds a work held by each of the work chuck shafts. The grinding accuracy of a multi-axis grinding machine that grinds with one grindstone or grinding wheel attached to a workpiece is detected from the taper value of each workpiece machining surface, and the machining accuracy of a plurality of workpiece chuck shafts is determined based on the detection result. mean change the request of, by axis each workpiece chuck according to the mean change, modify the grinding condition of the wheel when determining the predetermined parameter corresponding to the processing condition of the grinding wheel by both the determined parameters for each axis the workpiece chuck The present invention relates to a control device for a multi-axis grinding machine which corrects the processing accuracy by performing the processing.

[0002]

2. Description of the Related Art In general, in the grinding of a workpiece, a high processing accuracy is required for a desired processing size together with a high surface roughness having a high smoothness. Therefore, in a grinding machine, conventionally, a configuration is adopted in which a processing dimension of a work is measured in an in-process or a post-process, and a measurement result is fed back to correct the processing accuracy. holding the workpiece, the workpiece chuck shaft for rotation is driven high <br/> speed rotation, also to the wheel spindle that is attached to the tip of the grinding wheel is also driven high speed, the entire body of the grinder drive motor
Thermal expansion easily occurs due to the transmission of heat generated by the grinding wheel, deformation around the work chuck shaft, around the grindstone shaft, etc., as well as sharpening according to the wear of the grindstone with the progress of grinding and the operation time after dressing processing. Changes in grinding wheel conditions, such as a decrease, are a significant cause of lowering grinding accuracy.

As a countermeasure for improving the processing accuracy of such a grinding machine, Japanese Patent Application Laid-Open No. Sho 62-107970 discloses a grinder control device which has a grindstone shaft provided with a grindstone at the tip thereof, and a grindstone. A correction device that corrects with a correction tool, a grinder, a taper correction device that corrects the taper of a work by adjusting a center point of reciprocation (oscillation) of the grindstone in the axial direction of the work or an inclination angle of the grindstone with respect to the work, a processing speed detector that detect the machining number of workpieces, according to the grinding wheel diameter measuring device for detecting the grinding wheel diameter, machined tapered measuring unit and the grindstone diameter for measuring the amount of taper of the work, state of wear of the grindstone correction tool, etc. Further, a control device that includes a taper correcting device that controls the taper correcting device and corrects the grinding accuracy is disclosed. In other words, a proposal has been made to improve the processing accuracy by detecting a change in the processing accuracy according to the progress of the grinding process and changing the grinding conditions.

[0004]

However, the control device for a grinding machine according to the above-mentioned conventional proposal relates to a grinding machine having a single work chuck shaft. On the other hand, in recent years, a plurality of work chuck shafts are provided, and a plurality of works are held on a plurality of shafts by one chuck, and a grinding process for a plurality of works is performed by a grindstone attached to a tip of a single grindstone shaft. Multi-axis grinding machines that can be performed as a series of grinding processes have been put to practical use. In such a multi-axis grinding machine, when the average value of the processing accuracy is measured for each work chuck axis, generally different results are obtained between the axes. That is, if the above-described conventional control method for correcting machining accuracy is applied to such a multi-axis grinding machine, there is a disadvantage that a plurality of control devices are required.

However, in a multi-axis grinding machine, the tendency of the machining accuracy of a plurality of work chuck shafts to decrease is such that, for some of the plurality of work chuck shafts, the machining accuracy is smaller than a desired machining dimension value. The actual grinding dimension of the workpiece has a tendency to decrease in machining accuracy, tapering divergently from the chuck shaft end side to the free end side, and changes in machining accuracy in the remaining axis are tapered in the opposite direction. There is no tendency, and all axes always show the same tendency of change in machining accuracy.

Accordingly, an object of the present invention is to pay attention to the uniformity in the changing tendency of the processing accuracy of such a multi-axis grinding machine,
An object of the present invention is to provide a control device for a multi-axis grinding machine which can correct a decrease in processing accuracy of a plurality of work chuck shafts by a control action of one control means.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a method in which a plurality of workpieces on a plurality of workpiece chuck shafts are successively mounted on a single grinding wheel shaft according to a predetermined grinding program. In a multi-axis grinding machine having a configuration in which grinding is performed and dressing of a grindstone is appropriately performed by a dresser device, the processing precision after the grinding processing is twice measured by the processing precision measuring means for all the work chuck shafts. The amount of change in machining accuracy is calculated for each work chuck axis by calculating means by measuring the difference and calculating the difference value, and the average of the series of changes for each axis is calculated for all axes. In order to correct the decline in machining accuracy predicted in the next grinding process, the average change in machining accuracy obtained as a calculation result is used to predict the machining accuracy for each work chuck axis. By adjusting and correcting the set value of the grinding condition of the grindstone by feedback control, the control device based on the technical idea of correcting the grinding accuracy of each work chuck shaft and improving the machining accuracy was configured. Things.

That is, according to the present invention, a plurality of work chuck shafts, a grindstone shaft having a grindstone for performing a grinding process of a work held by the plurality of work chuck shafts attached to the tip end, A multi-axis grinder for correcting the grinding accuracy of each work chuck shaft of a grinder provided with a numerical control means for controlling the work grinding by the attached grindstone according to a predetermined numerical control program and a dresser device for grindstone dressing In the control device, processing accuracy detection means for detecting, via a taper value, the grinding accuracy of the workpiece on each of the work chuck shafts that have been ground by the grindstone, A work chuck shaft detecting means for identifying and detecting the work chuck shaft, and a dressing indicating a dressing state of the grinding wheel by the dresser device. Dressing data detecting means for detecting and transmitting grinding data, and adjusting predetermined parameters indicating grinding conditions of the grindstone for each work held on each of the work chuck shafts to correct the grinding accuracy of each work. Machining accuracy correcting means, data of a taper value representing machining accuracy for each of the work chuck axes detected by the machining accuracy detecting means, an identification number of the work chuck axis detected by the work chuck axis detecting means, the dressing From the dressing data and the like detected and transmitted by the data detecting means, an average change amount of the machining accuracy for the plurality of work chuck axes is obtained, and the grinding wheel is grinded for each work chuck axis in accordance with the average change amount of the work accuracy. A predetermined parameter value corresponding to the processing condition is determined, and the determined parameter value is It actuates the machining accuracy correction means I is the respective workpiece chuck axis different modifying the machining precision machining accuracy correction control means and the multi-axis grinding machine control system having the configuration provided is provided.

[0009]

According to the above construction, the machining accuracy correction control means is configured to calculate the average change amount of the machining accuracy obtained for all the work chuck axes at the time of setting a predetermined parameter corresponding to the grinding condition of the grinding wheel for each work chuck axis. Is fed back to obtain the value of the parameter that has been corrected and adjusted, and the corrected parameter value is applied to the processing accuracy correcting means to operate the processing accuracy correcting means. The processing accuracy can be corrected for each work chuck shaft of the multi-axis grinding machine.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the embodiments shown in the accompanying drawings. FIG. 1 is a block diagram showing an overall configuration of a control device of a multi-axis grinding machine according to an embodiment of the present invention, and FIG. 2 is a flowchart showing a correction operation of processing accuracy performed by the control device.

Referring now to FIG. 1, a multi-axis grinding machine 10 according to an embodiment of the present invention is a machine body 1 having two work chuck shafts 12A and 12B erected on a base 13 as an example.
The machine body 14 has a built-in rotary motor for driving the work chuck shafts 12A and 12B, a reduction gear mechanism, and the like.

Each of the work chuck shafts 12A and 12B has a well-known chuck pawl mechanism at a tip thereof, and has a work W
1 and W2, and these work chuck shafts 12A,
A grindstone table 16 is provided at a position facing 12B. On the wheel head 16, the grinding wheel spindle 18 is provided, the grinding wheel 20 at the tip of the high-speed rotatably accommodated grinding wheel axis 18 A in whetstone spindle 18 is mounted detachably, the high-speed rotation of the grinding wheel 20 Thus, the workpieces W1 and W2 held by the workpiece chuck shafts 12A and 12B can be subjected to grinding. At this time, the above-mentioned grindstone base 16 and grindstone spindle 18 incorporate a grindstone feed mechanism for giving a cutting feed to the grindstone 20, an oscillation mechanism for giving an oscillation operation (reciprocating motion) to the grindstone 20, and the like. , optionally grinding end surface of the traverse mechanism and the grinding wheel 20 to traverse operate the grinding wheel 20 to the workpiece chuck shaft 1 2A or 12B parallel to the axial direction, a predetermined inclination angle with respect to the processed surface of the workpiece W1 or W2 A swivel mechanism or the like that rotates and adjusts so as to abut at (swivel angle) is also provided.

The body 14 is formed, for example, so as to be pivotable about a horizontal axis parallel to the work chuck shafts 12A and 12B, and is provided on the front surface of the body 14.
One of the two work chuck shafts 12A and 12B can be indexed to a position where one of the shafts 12A or 12B faces the grindstone 20 in the axial direction, that is, a position where the grindstone 20 performs a grinding operation. Therefore, the airframe 1
Reference numeral 4 denotes an axis number detector including a dog 30A or 30B for identifying an axis number on a side portion of each of the work chuck shafts 12A and 12B, and the dog 30A or 30B including a limit switch fixed at a predetermined position. When engaged with 32,
Which work chuck shaft 12A or 12B
The detection signal of the detector 32 is sent to the work chuck shaft number detecting means 34.

A dresser 40 for dressing the grindstone 20 is provided in the vicinity of the grindstone table 16, and the dresser 40 and the grindstone table 16 are formed so that they can approach or separate from each other. The dresser 40 is provided so as to perform a dressing function for dressing.
Is configured to perform a dressing operation when a dressing command is appropriately received via the grinding wheel state detecting means 42 in accordance with a predetermined grinding program from a numerical controller NC described later. Therefore, the grinding wheel 20 sharpened by dressing from the numerical controller NC via the grinding wheel state detecting means 42 performs the grinding operation on the workpiece W1 or W2 thereafter, or repeats the same type of workpiece grinding operation. When performing, the dressing state of the grinding action surface of the grindstone 20 that changes depending on how many pieces of the workpiece grinding have been performed after the dressing, that is,
It is possible to detect the detection signal of the grinding wheel state.

Further, a machining accuracy measuring device 46 for detecting the grinding accuracy of the workpieces W1, W2, etc. is provided on the machine base 13, and the machining accuracy measuring device 46 includes a well-known electric micrometer or a Marposs inner diameter. It consists meter or the like, having a measuring probe 46A on the tip, for example, the inner surface grinding process of the workpiece W2, loaded with the measurement probe 46 a to be grinding plane of the workpiece, the workpiece W2 workpiece chuck shaft 1
To measure the degree of taper from the chuck end side of 2B toward the work front end side, that is, whether the tape has a tapered shape diverging toward the work front end side,
It is formed so that the processing accuracy of the surface to be ground can be measured by actually measuring whether or not it has a converging taper shape, and the measurement data is sent to the processing accuracy detector 48. That is, the processing accuracy measuring device 46 and the processing accuracy detector 48 constitute the processing accuracy detecting means essential for the present invention.

It is desirable that the machining accuracy measuring device 46 is also connected and configured so that the machining accuracy is automatically measured in response to the measurement command from the numerical controller described above. It is possible to measure the accuracy at any time, such as after a predetermined grinding process, after the end of the machining process, etc. It is also possible to configure to execute. According to the present invention, there is further provided a control device as a main device for correcting the grinding accuracy of the work, and this control device is provided on a control panel outside the machine base 13 and is a known device. It is provided with a grinding control section 50 which can be constituted by a personal computer or the like, and has the work chuck axis number detecting means 34, the grinding wheel state detecting means 42, and the processing accuracy measuring device 4 of the multi-axis grinding machine described above.
6 and a processing accuracy detector 48, which is connected via a signal line.

The control unit 50 is a well-known processor unit or a known processor unit for correcting the processing accuracy of the work grinding performed on each of the plurality of work chuck shafts 12A and 12B of the above-described multi-axis grinding machine by a feedback control method. A grinding condition calculating means 52 comprising a CPU and having a memory means 52A pre-stored with predetermined arithmetic expressions and the like connected thereto is provided. The grinding condition calculating means 52 includes the above-described processing accuracy detecting means 48, Detection signals from the detection means 42, the work chuck axis number detection means 34, and the like are input via interface means (not shown). Grinding condition setting means 54A, 54B are connected to the grinding condition calculating means 52 in correspondence with the number of work chuck axes, and the respective grinding conditions determined by the above-mentioned grinding condition calculating means 52 for each of the work chuck shafts 12A, 12B. ,
For example, the work of the grinding portion of the grindstone 20 can be performed by setting the stroke amount of the grindstone oscillation (reciprocating motion), the start position or the end position of the oscillation, or the swivel angle of the grindstone shaft 18A to which the grindstone 20 is attached. It is possible to store and store parameters that affect the processing accuracy, such as the inclination angle with respect to the processing surface. The grinding condition setting means 54A and 54B are connected to the grinding condition selecting means 56 provided as means for selecting grinding conditions for a plurality of workpiece chuck axes. Reference numeral 56 denotes the grinding condition setting means 54 for setting the respective grinding conditions of the work chuck shaft 12A or 12B.
A and 54B can be selectively read.

Further, the grinding control section 50 includes a grinding condition changing means 58 which constitutes a processing accuracy correcting means of the present invention, and the grinding condition changing means 58 changes the grinding condition of the grindstone 20 from the present value to each of the above. Grinding condition setting means 54A for each axis,
This is a means for changing and setting the grinding conditions stored and stored in the 54B to execute the correction of the processing accuracy, and actually sends new grinding conditions to the numerical controller NC to perform the grinding by the numerical controller NC The grinding condition of the program is modified to adjust and correct the grinding action of the grindstone 20.

Next, the operation of correcting the grinding accuracy performed by the above-described control device will be described below. In the following description, for convenience, an example in which the inner surfaces of the cylinders of the workpieces W1 and W2 are internally ground will be described with reference to the flowchart of FIG. Work W1, gripped by the work chuck shafts 12A and 12B of the multi-axis grinding machine,
In the grinding process for performing the grinding process of W2, usually, first, one of the work chuck shafts 12A processes the work W1 according to a grinding program from the numerical controller NC, and the processing accuracy after the processing is determined. The measurement and the like are performed, and then the work W2 gripped by the work chuck shaft 12B is similarly subjected to the grinding and the processing accuracy measurement after the processing. During this time, a new work W1 is exchanged and attached to the work chuck shaft 12A to prepare for the next grinding. Needless to say, work replacement and attachment for replacing the work W2, for which grinding has been completed, with a new work W2 are also sequentially performed on the work chuck shaft 12B.

Now, during the grinding process of the above-mentioned multi-axis grinding machine, the processing accuracy of the workpieces W1 and W2, typically,
The taper value is measured by the processing accuracy measuring device 46 from the length from the innermost position of the inner surface of the processed cylinder to the entrance end position of the workpiece and the diameter value at both positions, and data on the taper value of the measurement result is The data is input from the processing accuracy detector 48 to the memory means 52A connected to the grinding condition calculating means 52 of the grinding control unit 50 via the detection signal line, and is temporarily stored and stored in the memory means 52A (step 1).

Here, the detection data of the processing accuracy is obtained by measuring and detecting the processing accuracy of each of the work chuck shafts 12A and 12B after at least two grinding steps, that is, after the previous processing and after the current processing. The detection data of the two processing precisions are stored and accumulated in the memory means 52A. Therefore, unlike the illustrated embodiment, the multi-axis grinding machine having N work chuck shafts stores and accumulates (2 × N) pieces of processing accuracy data, and also has two workpieces as shown in the illustrated example. The grinding machine provided with the chuck shafts 12A and 12B stores and accumulates four processing accuracy data.

[0022] On the other hand, such a workpiece W1, W2 of the grinding inter the extent, of the grinding wheel 20 dressed is performed by a dresser 40 against the grinding wheel 20 of the multi-axis grinding machine dressing is whether or not made The data, that is, the data of the grinding wheel state is detected from the machining program of the numerical controller NC via the grinding wheel state detecting means 42, and this grinding wheel state detection signal is also transmitted via a signal line to the memory means 52A of the grinding controller 50.
And stored and stored in the means 52A (step 2).

Similarly, the workpiece chuck shafts 12A, 12B which detect the Docs 30A, 30B with the limit switch 32
Is also detected by the work chuck axis number detecting means 34, and the detected data is input to and stored in the memory means 52A of the grinding control section 50 (step 3).

As described above, the memory means 52A stores and accumulates the processing accuracy detection data and the grinding wheel state data in correspondence with the axis numbers of the respective work chuck shafts 12A and 12B. The detection data is read out by the grinding condition calculating means 52,
The amount of change in the processing accuracy, that is, the amount of change in the taper value, is calculated for each of the work chuck shafts 12A and 12B. This calculation is based on the same subtraction formula, paying attention to the fact that the change in machining accuracy on a plurality of work chuck axes of a multi-axis grinding machine has the same tendency, such as whether the increase or decrease is uniform for all axes. Is performed. That is, for example, assuming that two taper values, which are detection data of machining accuracy between the previous time and the present time in the work chuck shaft 12A, are A1 and A2, an operation for obtaining a difference therebetween is performed, and a change amount ΔA = A2−A1 is obtained. . Similarly, assuming that two taper values B1 and B2, which are the detection data of the machining accuracy of the previous and current machining on the work chuck shaft 12B, are B1 and B2, an operation of a variation ΔB = B2−B1 is performed.

Subsequently, the grinding condition calculating means 52 divides ΔA and ΔB obtained as a result of the above calculation by the number of work chuck axes, X = 2, thereby obtaining an average change amount ΔAV.
(2) = (ΔA + ΔB) / 2 is obtained (step 4).
If the number of work chuck axes is N, ΔA, ΔB...
It is needless to say that the change amounts of N machining precisions of ΔN are obtained, and the average change amount ΔAV (N) obtained by dividing the total number of axes X = N is obtained.

After obtaining the average value ΔAV (2) of the change amount of the machining accuracy for all the work chuck axes, these are added to the current machining accuracy detection data A1 and B2, and the data of the next machining accuracy are obtained. Is temporarily input and stored in the memory means 52A as a predicted value. Next, from the predicted value of the next machining accuracy obtained as described above, a value for adjusting and correcting the grinding conditions when the next work W1 and W2 is ground by the respective work chuck shafts 12A and 12B is determined. (Step 5). This determination is made, for example, by the data value indicating the grinding accuracy after the inner surface grinding of the work, that is, the amount of change in the taper value from the work chuck shaft end side to the tip side of the work is the result of the previous measurement and detection, plus How to adjust and change the grinding conditions in accordance with both the tendency to increase and the case to show a negative increase tendency is experimentally determined in advance on a plurality of points in the relationship between the vertical and horizontal axes. Then, it is obtained, stored as graph data in the memory means 52A, and registered.

When the above-mentioned predicted value of the next processing accuracy is obtained, what kind of increase in the amount of change obtained as a difference value between the predicted value and the processing accuracy A2 and B2 by the current measurement and detection is obtained. The grinding condition calculating means 52 determines whether or not there is a tendency, and the determination result is stored in the memory means 52.
A means for adjusting the grinding conditions and obtaining correction values by comparing the data table or the graph data of A with the above-mentioned arithmetic means 5
2 may be determined.

The most preferable values for the grinding conditions include the stroke amount of the oscillation operation (reciprocating motion) applied to the grindstone 20 of the grindstone spindle 18 during the grinding operation, and the before and after the oscillation operation. The position or the like is used as a parameter. In the stage of experimentally obtaining the data table or graph data of the above-described grinding conditions,
If it is determined in consideration of the dressing state of the grinding wheel 20, the grinding wheel state detecting means 42 in step 2
The adjustment and the correction value of the grinding condition can be determined in consideration of the detection input of the grinding wheel state input through the CPU.

The adjustment and correction values of the grinding conditions obtained above are used to adjust and correct the current processing condition values to obtain the grinding conditions for executing the next grinding, and thus the correction thus obtained. grinding conditions after the input in step 3 from the workpiece chuck axis number detecting means 34 in the memory means 52A, in correspondence with the axis number stored, the workpiece chuck shafts 12A, grinding condition set for each 12B means 54 a It is set to 54 B (step 6). After setting the next grinding condition, when the next grinding process is sequentially performed on each of the work chuck shafts 12A and 12B,
Axis each grinding condition setting means 56 selects and reads the grinding conditions are set to the grinding condition setting unit 54 A, 54 B for each axis, and inputs the grinding condition changing means 58 (Step 7).

Accordingly, the grinding condition changing means 58 inputs the inputted grinding condition to the numerical control unit NC of the multi-axis grinding machine, and performs the next grinding according to the grinding condition on each of the work chuck shafts 12A, 12B. (Step 8). In the above-described embodiment, when the inner surface grinding of a work is performed while giving an oscillation operation to the grindstone 20 by the frequently used oscillation grinding method, the wear of the grindstone and the machine body generally follow the progress of the grinding process. Under such circumstances, in order to improve the processing accuracy of the grinding process, in order to reduce the taper that occurs on the surface to be ground of the work, , Wheel head 16, wheel spindle 18
It is known that it is effective to adjust the rear end position and the stroke amount before the oscillation operation given to the grindstone 20 via the grinding wheel. In addition, the taper value is measured and detected after the grinding, and the detection result is fed back to adjust and correct the next grinding with the oscillation position as a correction parameter.

Further, in a multi-axis grinding machine, attention is paid to the fact that a decrease in grinding accuracy occurs for each work chuck axis due to a unified tendency, and the average change in machining accuracy for all axes is obtained by calculation. A predicted change amount of the next processing accuracy is obtained by using the amount, and the obtained predicted change amount is reduced by correcting the oscillation position, thereby improving the processing accuracy.

In the above-described embodiment, the description has been given of the case where the oscillation position and the oscillation stroke amount are adjusted as the parameters for adjusting and correcting the grinding conditions. By rotating the shaft 18A, the inclination angle (swivel angle) between the grinding surface portion of the grindstone 20 and the grinding surface of the work is selected as a parameter,
Even if the parameters are adjusted and corrected, the same operation and effect as in the above-described embodiment can be achieved.

Further, in the above-described embodiment, the amount of change is obtained by measuring and detecting the taper value, which is an index of the grinding accuracy, twice, and the oscillation position is determined in accordance with the tendency of increase or decrease in the change. Instead, the relationship between various taper values and the oscillation position to be applied to the grindstone is experimentally obtained in advance over a wide range of taper values, and the relationship is determined, for example, in a table ( Table) and registered in the memory means, and in the stage of correcting the oscillation position by feedback as described above in order to correct the processing accuracy during the grinding process, the actual measurement and detection were performed from the relationship stored above. If the correction value of the oscillation position is weighted and corrected in accordance with the range of the taper value in which the taper value is generated, the texture on the surface to be ground can be corrected. Since the modified according to whether Pas reduction is to what extent occurs, finer improves the machining accuracy, it is possible to improve.

[0034]

As described above, according to the present invention, in a multi-axis grinding machine having a plurality of work chuck shafts, the processing accuracy after the grinding process for each of all the work chuck shafts is measured twice by the processing accuracy measuring means. Then, by calculating the difference value, the amount of change in machining accuracy for each work chuck axis is obtained by the calculating means, and the change in each series of each axis is calculated for all the axes to calculate an average value. Use the average change amount of the processing accuracy obtained as above for the prediction of the processing accuracy for each work chuck axis, and set the grinding conditions of the grinding wheel to correct the decrease in the processing accuracy predicted in the next grinding process By adjusting and correcting the value by feedback control, the grinding accuracy of each work chuck axis is corrected and the processing accuracy is improved, so that the processing accuracy of each axis of the multi-axis grinding machine is adjusted. Modified standing, relatively easy to improve the machining accuracy compared with troublesome resistance when improving, yet is of reasonably achievable effects are obtained if.

Further, in the multi-axis grinding machine, the fact that the increasing trend of the amount of change in machining accuracy occurs uniformly for all of the plurality of work chuck shafts, the machining accuracy of each work chuck shaft is reduced. When calculating the amount of change, it is only necessary to measure and detect the processing accuracy of the workpiece only after the previous and the current two grinding operations, and to calculate the changing tendency of the processing accuracy independently for each work chuck axis. In order to improve the grinding accuracy by quickly finding the tendency of the change in the grinding accuracy in contrast to the fact that the change tendency cannot be grasped unless the grinding accuracy is measured and detected many times, and by modifying the grinding conditions As a result, an effect of efficiently improving the accuracy of grinding can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an overall configuration of a control device for a multi-axis grinding machine according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a correction operation of processing accuracy performed by the control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Multi-axis grinder 10 12A ... Work chuck shaft 12B ... Work chuck shaft 13 ... Machine stand 14 ... Machine body 16 ... Grinding wheel stand 18A ... Grinding wheel shaft 20 ... Grinding stone 30A ... Dog 30B ... Dog 32 ... Limit switch 34 ... Work chuck shaft Number detecting means 40 Dresser 42 Grinding wheel state detecting means 46 Machining accuracy measuring device 48 Machining accuracy detector 50 Grinding control section 52 Grinding condition calculating means 52A Memory means 54 Grinding condition setting means 56 Grinding for each axis Condition selecting means 58 ... Grinding condition changing means

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B24B 49/18 B24B 5/06 B24B 47/25

Claims (1)

(57) [Claims] 1. A work comprising: a plurality of work chuck shafts; a grindstone shaft having a tip attached to a grindstone for performing a grinding process of a work held by the plurality of work chuck shafts; and a grindstone attached to the grindstone shaft. Numerical control means for controlling the grinding in accordance with a predetermined numerical control program, and a multi-axis grinding machine control device for correcting the grinding accuracy in each work chuck shaft of the grinding machine equipped with a dresser device for grinding wheel dressing, Processing accuracy detecting means for detecting, via a taper value, the grinding accuracy of the work on each work chuck shaft ground by the grindstone, and identifying the work chuck shaft that is currently performing work grinding by the grindstone of the grindstone shaft, Work chuck axis detecting means for detecting, and detecting and transmitting dressing data indicating a dressing state of the grindstone by the dresser device. Dressing data detecting means, and a processing accuracy correcting means capable of adjusting a predetermined parameter indicating a grinding processing condition of the grindstone for each work held on each of the work chuck shafts, and correcting the grinding accuracy of each work. Data of a taper value representing the processing accuracy of each work chuck axis detected by the processing accuracy detection means, an identification number of the work chuck axis detected by the work chuck axis detection means, detected by the dressing data detection means , machining of the grinding wheel in accordance with the average amount of change in the machining accuracy with from the dressing data sent <br/> obtain an average change amount of the machining accuracy regarding the plurality of workpiece chuck axis for each workpiece chuck shafts A predetermined parameter value corresponding to the condition is obtained, and the processing accuracy is corrected according to the obtained parameter value. A machining accuracy correction control means for operating the means and correcting the machining accuracy for each work chuck axis.