JPH05324021A - Feedback type machining condition correcting device - Google Patents

Abstract

PURPOSE:To improve the precision of correction by a machining system, which feeds size information on a work after machining back and corrects the constant size point of a constant size device, even in a state wherein the waiting time of the work after machining for size measurement is varied. CONSTITUTION:An all-work measuring instrument 14 which is arranged on the downstream side of a machining machine 10 and measures the internal diameter of a machined hole and a work quantity counter 34 which measures the number of waiting works as the number of works staying between the machining instrument 10 and all-work measuring instrument 14 are connected to a controller 28. This controller 28 is connected to the constant size device 22 which controls a machining tool. Further, the controller 28 sequentially determines a correction value for the constant size point, and uses fuzzy inference to determine the current correction value according to the size error of the measured value by the all-work measuring instrument 14 from a command, its variation tendency, at least one correction value determined before the last time, and the number of waiting works.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for feeding back dimensional information of a work after processing to correct the processing conditions, and more particularly to a technique for improving the accuracy of the correction.

[0002]

2. Description of the Related Art For example, a machined portion such as an inner cylindrical surface such as a cylinder bore of an engine of a vehicle or an outer cylindrical surface such as a journal surface of a crankshaft of an engine has an actual dimension such as an actual diameter accurately matching a target dimension. A feedback type processing condition correction device is used to perform the processing as described above.

There are the following types of this device. It is used by being connected to (a) processing tool control means that controls processing tools that sequentially process multiple workpieces according to processing conditions, and (b) dimension measurement means that sequentially measures the dimensions of multiple processed workpieces. A feedback type machining condition correction device that is configured to obtain information regarding the dimensions of each machined workpiece based on the measurement result by the dimension measuring means,
Based on this, the processing conditions of the processing tool are corrected.

Conventionally, this type of feedback type machining condition correcting apparatus has been designed to acquire only the dimensional error of each machined workpiece as dimensional information and correct the machining conditions. However, the correction of the processing conditions should be performed by considering as many factors as possible that affect the actual size of the work. Therefore, the conventional device cannot sufficiently improve the accuracy of the correction.

In view of such circumstances, the present applicant has previously developed the following device. This is the applicant's Japanese patent application No. 4
A feedback type machining condition correction device described in the specification of No. 61305, wherein a dimension information acquisition means for acquiring not only a dimension error of a workpiece after machining but also a change tendency thereof as dimension information. Processing condition correction means for determining a correction value for the processing condition based on the dimension information. Further, the applicant is a feedback type machining condition correcting apparatus described in the specification of Japanese Patent Application No. 4-61306 of the present applicant, wherein the dimensional information acquisition means and the correction value of the machining condition are sequentially determined. A processing condition correction means for determining the present correction value based on the acquired dimensional information and the past correction value including at least the previous correction value has also been developed.

[0006]

These developed feedback type machining condition correcting devices (hereinafter simply referred to as "developing devices") are also used by being connected to the machining tool control means and the dimension measuring means. In the processing tool control means and the dimension measuring means, the dimension measurement means does not immediately measure the dimension of the workpiece as soon as the workpiece is processed by the processing tool. It is usually performed after waiting for the completion of the dimension measurement of the formed work. Therefore, in the above-mentioned development device, the standard value of the number of waiting workpieces that are machined workpieces and waiting for dimension measurement is uniquely set, and the optimum control rule is set under the standard value, The condition correcting means is supposed to correct the processing condition of the work to be processed next by the processing tool according to the control rule and based on the latest dimension information (information based on the latest dimension measurement result). .. However, the number of waiting works may actually deviate greatly from the standard value. Therefore, the above-described developed device has a problem in that the desired correction accuracy cannot be realized when the number of standby works deviates greatly from the standard value.

As described above, the problem of the device for correcting the machining condition by the feedback system on the assumption that the number of waiting works is constant has been described by taking the above-mentioned developed device as an example. However, this problem is not limited to the developed device. As described above, similarly, there is a conventional apparatus that acquires only the dimension error as the information regarding the dimension error and corrects the processing condition based on the feedback error.

Based on the above circumstances, the present invention provides
(a) Connected to a processing tool control means for controlling a processing tool for sequentially processing a plurality of workpieces of at least one type according to processing conditions, and (b) a dimension measuring means for sequentially measuring the dimensions of a plurality of processed workpieces In a feedback type machining condition correction device used after being corrected, the above problem is solved by correcting the machining condition in consideration of not only the dimension information of the work but also the number of waiting works. Is.

[0009]

In order to solve this problem, the gist of the present invention is to process the above-mentioned feedback type machining condition correcting device based on the measurement result by the dimension measuring means as shown in FIG. Dimension information acquisition means 1 for acquiring information about the dimensions of each work for each type of work,
Standby work number acquisition means 2 for acquiring, for each type of work, the number of workpieces that have been processed by the processing tool and are waiting for the dimension measurement by the dimension measurement means, and processing of the work to be processed next by the processing tool. The processing condition correction means 3 determines the correction value of the condition based on the dimension information and the number of standby works acquired by the dimension information acquisition means 1 and the standby work number acquisition means 2 for the same work type. There is something to do.

The present invention can be applied to the case where only one type of work is processed by the same processing tool, and the case where a plurality of types of work are processed. "Work" does not always mean "a plurality of works having different target dimensions". If the target size, that is, the target machining shape is the same, but the rigidity of the work is different, it may be appropriate to change the machining conditions accordingly. Work "is" multiple types of work "
This is because

Further, one mode of the "machining condition correcting means 3" in the present invention defines the relationship between the dimensional information and the correction value for each type of work and individually for all possible numbers of waiting works. One control rule to be stored is stored in advance, the control rule is selected according to the acquired number of standby works and the actual type of the work, and in accordance with that, the processing condition is obtained based on the acquired dimension information. Can be determined.

According to another mode, a plurality of representative control rules corresponding to representative ones of all the control work rules among all the control rules can be stored in advance for each kind of work. However, each of the representative control rules corresponding to the actual type of workpiece estimates the degree of influence that it is expected to have on the true correction value under the acquired number of standby workpieces. It is also possible to determine the correction value of the processing condition based on the rule and the respective influence degrees thereof.

Yet another aspect is that, for each type of work,
One control rule representative of all the control rules and the relationship between the number of standby works and the correction coefficient are stored in advance, and first, according to the representative control rule corresponding to the actual type of work, and Candidate values for the correction values of the processing conditions are determined based on the acquired dimension information, and the correction coefficient is determined according to the above relationship and according to the number of standby works acquired, and the determined correction value candidates are determined. It is also possible to determine the true value of the correction value from the value and the correction coefficient.

Still another aspect is that, for each type of work,
Prescribes the relationship between the number of standby works, dimension information, and correction values 1
Each control rule is stored in advance, and the correction value of the processing condition is determined according to the control rule and based on the acquired number of standby workpieces and dimension information and the actual type of workpieces. You can also

[0015]

In the apparatus of the present invention, the dimension information acquisition means 1 acquires the dimension information of each work processed by the processing tool for each work type based on the measurement result by the dimension measurement means, and the standby work number acquisition means. 2, the number of workpieces machined by the same machining tool and waiting for dimension measurement by the dimension measuring means is acquired for each type of workpiece, and the machining condition correcting means 3 acquires the acquired dimension information and standby workpieces. The correction value of the processing condition is determined based on the number and the type of work. The correction value for the processing condition is determined in consideration of not only the dimension information and the type of work but also the number of waiting works.

[0016]

As described above, according to the present invention, since it is possible to correct the machining condition in consideration of the number of waiting works, even if the number of waiting works varies greatly, the machining conditions can be accurately adjusted. The effect that it becomes possible to correct is obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A processing system including a feedback type fixed point correction device according to an embodiment of the present invention will be described in detail below with reference to the drawings.

This processing system is used for an automobile engine,
A cylinder block having a plurality of cylinder bores is a workpiece to be machined, and an inner cylindrical surface of each cylinder bore of each cylinder block is a machined hole to be machined, which is provided for honing the machined hole. That is,
In the present embodiment, a work in which a plurality of machined holes are set is one aspect of the “work” in the present invention.

As shown in FIG. 2, this processing system has
A processing machine 10 that has a processing line (indicated by arrows in the drawing) in which a plurality of works of only types are conveyed in a line, and at a certain position among them, a horn is used as a processing tool to honing each cylinder bore of each work. Is arranged, and at a certain position on the downstream side thereof, the total number measuring machine 14 for measuring the inner diameter of each machined hole for all the honed workpieces 14
Are arranged.

The processing machine 10 is provided with processing tools for each processing hole (equal to the number of processing holes in each work), and further,
A drive device for driving each processing tool is also provided for each processing hole. The in-process measuring head 18 is incorporated inside the horn of each processing tool. Each in-process measuring head 1
Numeral 8 measures the inner diameter of the machined hole by the air micrometer method during machining while moving with the horn. On the other hand, the total number measuring machine 14 includes a post-process measurement head 20 for each processed hole. Each post-process measurement head 20
Measures the inner diameter of the processed hole by an electric micrometer method.

That is, in the present embodiment, the inner diameter of the processed hole is one aspect of the "dimension" in the present invention, and
The total number measuring machine 14 is one mode of the "dimension measuring means".

The processing machine 10 and the in-process measuring head 18
And are respectively connected to the sizing device 22. On the other hand, the total number measuring machine 14 is connected to a control device 28 mainly composed of a computer including a CPU, a ROM and a RAM. The control device 28 is also connected to the sizing device 22 and further has a data bank 32 as a device for storing data.
Is also connected to.

In this embodiment, on the processing line between the processing machine 10 and the total measuring machine 14, the total measuring machine 1
There is a work waiting for the measurement by 4 and the number of such waiting works is measured by a work number counter 34 mainly composed of a computer. The work number counter 34 includes a first sensor 36 (for example, a limit switch or the like) 36 for detecting the carry-out of the work from the processing machine 10 and a second sensor 38 (for example, a limit switch or the like) for detecting the carry-in of the work to the total number measuring machine 14. ), And the count value of the number of standby works is incremented by 1 each time the first sensor 36 detects the work carry-out, while the second sensor 38 counts the work carry-in every time the work carry-in is detected. The current value of the number of waiting works is measured by subtracting the value by one.

That is, in the present embodiment, the work number counter 34 cooperates with the first and second sensors 36, 38 to provide the "standby work number obtaining means 2" of the present invention.
It constitutes one aspect.

In addition, in addition, such a number of waiting works means a dead time in the control system in which the dimension information of the total number measuring machine 14 is an input signal and the correction value U of the sizing point in the control device 28 is an output signal. To do. Explaining the concept of dead time concretely, when the number of waiting works is 0,
Since the total number measuring machine 14 measures the dimension of the work immediately after the end of the machining, the dead time becomes 1, whereas when the number of standby works is Y (≧ 1), the total number measuring machine 14
Means that the dimension of the workpiece machined (Y + 1) times before is measured by the machine 10, so that the dead time is (Y +
1).

Next, the operation will be described.

Since a plurality of machined holes in each workpiece are machined at the same time by different machine tools and the operation for each machined hole is common, the operation for one machined hole will be described as a representative. And

Further, hereinafter, the processing machine 10, the in-process measuring head 18, the sizing device 22, the post-process measuring head 20, the control device 28 and the data bank 32 are related to a typical one processing hole. It means a part.

The sizing device 22 has its sizing point calibrated by an operator prior to a series of processes (a plurality of processes). Specifically, while the master work finished to the same size as the target size is being measured by the in-process measuring head 18, the reference voltage representing the sizing point is the output voltage from the in-process measuring head 18 (measurement It is calibrated by the operator so that the difference between the two is zero, which is exactly the same as (representing dimensions). Then, the sizing device 22 sequentially monitors the inner diameter of the hole being machined through the in-process measuring head 18, and when the measured size by this reaches the sizing point, the actual size reaches the target size. Anticipatingly, a control signal to the effect that one machining is to be finished is output to the processing machine 10 (more precisely, the drive device). Furthermore, this sizing device 2
2 is that if the correction value U of the sizing point is input from the outside, the sizing point is corrected accordingly, so that the inner diameter of the processing hole machined by the processing machine 10 is actually within a certain tolerance. To do. That is, in the present embodiment, the sizing point is one aspect of the "machining condition" in the present invention.

The sizing device 22 is determined by determining the sizing point correction value.
Is output to the control device 28. Control device 2
8, the measurement value of the machined holes by the total number measuring machine 14 is input as the measurement data, and based on this, the correction value U of the sizing point is obtained using the fuzzy inference while using the data bank 32. To decide.

Therefore, the control device 28 stores in advance the program represented by the flowchart of FIG. 3 in the ROM of its computer, and also stores the data for fuzzy inference in advance. The data for the fuzzy inference includes (a) an inference program, (b) a plurality of membership functions relating to an error value R which is a difference between a measured value X by the post-process measuring head 20 and a target value A ₀ , (c) an error A plurality of membership functions with respect to the derivative T of the value R,
(d) Multiple membership functions related to the correction value U of the sizing point, (e) Multiple membership functions related to the dead time MS, (f) Error value R, differential value T and correction value U It consists of multiple fuzzy rules.

Regarding the error value R, as it increases from negative to positive, "NB", "NM", "N"
Seven fuzzy labels are prepared, which sequentially change to "S", "ZO", "PS", "PM" and "PB".
Each membership function is graphically represented in FIG. For the differential value T, as it increases from negative to positive, “NB”, “NS”,
Five fuzzy labels that sequentially change to “ZO”, “PS” and “PB” are prepared, and the membership functions of each are represented by a graph in FIG. With respect to the correction value U, as it increases from negative to positive, “NB”, “NM”, “NS”, “Z
Seven fuzzy labels that sequentially change to “O”, “PS”, “PM”, and “PB” are prepared, and the respective membership functions are graphically represented in FIG. It should be noted that the increase of the correction value U means that the sizing point becomes higher and the diameter of the machined hole becomes larger, while
The decrease of the correction value U means that the sizing point is lowered and the diameter of the machined hole is reduced. For dead time MS, as it increases from 1 to 20, "P
Three fuzzy labels that sequentially change to "S", "PM", and "PB" are prepared, and the membership function of each is represented by a graph in FIG.

Three fuzzy rule groups are prepared,
It is considered to be optimum when the dead time MS is 1, 10 and 20, respectively. The optimum fuzzy rule group when the dead time MS is 1 is shown in the table below.

[0034]

[Table 1]

In this table, an example of the fuzzy rule is represented by If R = NS and T = PS then U = PS.

The optimum fuzzy rule group when the dead time MS is 10 is shown in the table below.

[0037]

[Table 2]

The optimum fuzzy rule group when the dead time MS is 20 is shown in the table below.

[0039]

[Table 3]

Basically, each of the fuzzy rule groups is
The correction value U decreases as the fuzzy label of the error value R increases (hereinafter, the error value R simply increases. The same applies to other parameters), and the correction value U increases as the differential value T increases. It is also designed to reduce U.

By the way, the in-process measuring head 18 may break down for some reason, and in this case, the measurement accuracy of the in-process measuring head 18 suddenly and greatly decreases. Nevertheless, if the correction value U is determined by relying on the output signal from the in-process measuring head 18, the actual dimensional accuracy of the machined hole may deviate from the allowable tolerance range.

In view of such circumstances, each fuzzy rule group basically has a sudden increase in the value X measured by the post-process measuring head 20 and a large increase in the measured value X. In each case, the correction amount U is also designed to approach 0 sufficiently. In this way, when the in-process measurement head 18 fails, the output signal from it is ignored, and machining is performed assuming that the sizing point up to the previous time is appropriate this time, so that the in-process measurement is performed. It is possible to maintain the dimensional accuracy of the machined hole at a high level without being greatly affected by the failure of the measuring head 18.

As described above, each fuzzy rule group is basically designed on the basis of the same idea, but in order to stabilize the dimensional variation of the product regardless of the size of the dead time MS, each waste is set. Each fuzzy rule group is designed in consideration of the unique circumstances of each time MS.

The program shown in FIG. 3 will be described. In brief, this program first calculates a current error value R _i based on the current measured value X _i , calculates a differential value T _i of the current error value R _i , and subsequently calculates the error value R _i. Based on the differential value T _i and the dead time MS, fuzzy inference is used to determine a candidate correction value U _i which is a candidate value of the true correction value U _i ^* at this time, and it is used as a candidate correction value U in the past. Correction is performed to determine the genuine correction value U _i ^* for this time.

Specifically, first, in step S1 (hereinafter,
It is simply represented by S1. The same applies to other steps)
At, a target value A ₀ of the inner diameter of the machined hole, parameters such as constants ω and n _max related to a moving average described later, and the like are input.
Subsequently, in S2, the measured value X _i (i = 0, 1, ...) Of this time is input from the total number measuring instrument 14, and in S3, it is acquired from the data bank 32 (see FIG. 8) before this time. A plurality of measured values X _i-1 , X _i-2 , ... (Hereinafter, simply referred to as past measured values X) are input.

Then, in step S4, based on the past measured value X and the present measured value X _i , the present measured value X _i is removed from the present measured value X _{i in} order to remove the adjacent variation (short period component) thereof. A moving average value P _i is calculated for X _i . In particular,

[0047]

[Equation 1]

It is calculated using the following equation. However, here, “ω _i ” is a weighting coefficient related to the current measured value X _i ,
“N _max ” means the number of measured values X in the past, and each is a known constant.

In this step, the measured value X _i of this time is directly used as the moving average value P _{i of} this time while the number of measured values X currently stored in the data bank 32 does not reach n _max. It has become so.

Therefore, for example, for a plurality of measured values X _i shown in the graph of FIG. 9 (a), a plurality of moving average values P _i shown in the graph of FIG. 9 (b) must be calculated. become.

When the execution of S4 is completed, in S5,
An error value R _{i of the} current moving average value P _{i from} the target value A ₀ is calculated. Then, in S6, the data bank 32
The moving average value P of the past m (≧ 2) times is input from the above, and the least squares regression line is calculated from them and the moving average value P _{i of} this time, and its differential value T _i (that is, the calculated minimum value). When the slope of the square regression line is θ (radian), tan θ) is calculated.

In this step, the differential value T _{i of} this time is set to 0 while the number of moving average values P currently stored in the data bank 32 does not reach m. The past moving average value P required to calculate the differential value T _i
Not all of them are ready.

If the error value R _i and the differential value T _{i of} this time are calculated as described above, the number of waiting works is input from the work number counter 34 in S7, and then S
8, the error value R _i and the differential value T _i and the dead time M
Fuzzy inference based on S and is performed.

This fuzzy inference will be specifically described. First, a fuzzy inference value (logical sum) based on the error value R _i and the differential value T _i is calculated for each fuzzy rule group.
When the dead time MS is ₁ , ₁₀ and ₂₀ , the optimum fuzzy rule groups are individually ORed with the membership functions of FIGS. 4 to 6 as the logical sums y ₁ , y ₁₀ and y _20.
Is calculated. Subsequently, for each of the three membership functions in FIG. 7, the fitness z _PS , z _PM and z _PB corresponding to the current value of the dead time MS is calculated, and thereafter,
The goodness of fit z _PS is multiplied by the logical sum y ₁ , z _PM is multiplied by y ₁₀ , and z _PB is multiplied by y ₂₀ , respectively, and the final fuzzy inference value y is calculated by summing these three products. To be done. Finally, the calculated fuzzy inference value y is defuzzified according to a defuzzification rule (not shown) to calculate the candidate correction value U _i this time.

Then, in S9, the data bank 32
From the past two candidate correction values U _i-1 and U _i-2 are input, and then, in S10, a least squares regression line is calculated from them and the current candidate correction value U _i, and The candidate correction value U _i is corrected to the value assumed by the calculated least-squares regression line to obtain the true correction value U of this time.
_i ^* is calculated. That is, in this step,
By correcting the candidate correction value U _i of this time by using the two past candidate correction values U based on the fact that the genuine correction value U ^* originally shows the continuity that it smoothly changes as the machining progresses. This time, the genuine correction value U _i ^* is calculated.

In this step, while the number of candidate correction values U currently stored in the data bank 32 does not reach 2, the current candidate correction value U _i remains the current genuine correction value U _i. It is supposed to be ^* .

Then, in S11, the present measured value X
_i is stored in the data bank 32, the moving average value P _{i of} this time is also stored in S12, the candidate correction value U _{i of} this time is also stored in S13, and the true correction value U _i ^{* of} this time is also stored in S14. To be done. Subsequently, in S15, the current authenticity correction value U _i ^* is output to the sizing device 22, and in S16, one of the plurality of fuzzy rules that was met in the current fuzzy calculation in the current execution of S8 ( The number of each fuzzy rule (fitness of at least one of the error value R and the differential value T is not 0) and the value of the membership function are also stored in the data bank 32. As described above, one execution of the program is completed, and subsequently, the next execution is performed in steps after S2.

The reason why the number of the plurality of fuzzy rules which is adapted in the fuzzy operation this time is stored is as follows. That is, if they are saved, for example, the type and frequency of the fuzzy rules used in the processing after the series of processing are completed, and the contents of the fuzzy rules and each membership function are used by using them. This is because the characteristics can be tuned easily and accurately.

As is clear from the above description, in the present embodiment, since the true correction value U ^* is determined in consideration of not only the information on the dimensional error but also the dead time MS, the dead time MS varies. It is possible to stabilize the dimensional variation of the product regardless of the above.

Further, in the present embodiment, since the true correction value U ^* is determined in consideration of not only the error value R but also the differential value T as the dimension information, the above-mentioned signal drift of the in-process measuring head 18 is determined. It is possible to obtain an effect that the diameter of the machined hole can be machined with high accuracy, irrespective of disturbances such as measurement errors and failures based on the above.

Furthermore, in the present embodiment, the present true correction value U _i ^* is determined on the basis of the fact that the true correction value U ^* indicates continuity. It is also possible to obtain the effect that the dimensional variation stabilizes almost independently of the variation.

Furthermore, in the present embodiment, a rule empirically recognized as existing between the error value R, the differential value T, and the correction value U, that is, a so-called empirical rule, indicates whether it exhibits linearity. Regardless of whether it shows non-linearity, it is faithfully expressed as a fuzzy rule and the processing conditions are corrected according to its empirical rules, so the processing conditions are corrected more appropriately in relation to various factors related to processing. The effect that it becomes possible to obtain is also obtained. However, the present invention can also be implemented as a method for determining the correction value of the processing condition using a control theory other than fuzzy reasoning, for example, PID control theory or modern control theory.

Further, in this embodiment, the dead time M
Since the fuzzy rule group is not stored for each S but only the typical fuzzy rule group is stored, the cost and time required for the storage can be reduced.

Further, in this embodiment, the fuzzy rule group is not influenced by the dead time MS, and the fuzzy rule group and the membership function of the dead time MS can be designed separately from each other. It is like this. Therefore, the burden of the designer on the maintenance is a dead time MS for each fuzzy rule group.
It is also possible to obtain the effect of being reduced compared to the case of designing in consideration of the influence of.

As is clear from the above description, in the present embodiment, the sizing device 22 constitutes one aspect of the "working tool control means" of the present invention, and among the control devices 28, FIG.
The part that executes S1 to 6, 10 and 11 of the above constitutes one mode of the "dimension information acquisition means 1", and the part of the control device 28 that executes S7 to 9 and S12 to 14 of FIG. This constitutes one aspect of the condition correcting means 3 ".

Although one embodiment of the present invention has been described above with reference to the drawings, the present invention can be implemented in other modes.

For example, in the above embodiment, based on the fact that the true correction value U _i ^* originally shows continuity,
Although ^* authentic correction value U _i was adapted to be acquired by correcting the correction value U _i calculated in S8 in FIG. 3 in the last correction value U, the present invention doing so It is not essential for implementation, and the present invention can be implemented, for example, by immediately setting the correction value U _i calculated in S8 to the true correction value U _i ^* .

In the above embodiment, each fuzzy rule group is a two-input one-output type in which the error value R and the differential value T are input and the correction value U is output. It is also possible to use a three-input one-output system in which the value R, the differential value T, and the dead time MS are input, and the correction value U is output.

Further, in the above-mentioned embodiment, the fixed point correction device used for a single-flow type machining line having one machining machine 10 and one 100% measuring machine 14 and capable of machining only one kind of work. It was an example of applying the present invention to
The present invention can also be applied to a fixed-size point correction device used for another type of processing line.

For example, the present invention can be applied to a fixed-point correction device used for the above-mentioned single-flow processing line for processing a plurality of kinds of works. In this case, the "standby work number acquisition means 2" in the present invention can be configured as follows, for example.

That is, as shown in FIG. 10, in addition to the work number counter 34, the first and second sensors 36, 38, (a) a work which is arranged at the entrance of the processing machine 10 and carried in there. Of the identification sensor 50 (the signal from this is also transmitted to the sizing device 22 to select the processing conditions for each type of work), and (b) the total number measuring machine 14
An identification sensor 52 that is arranged at the entrance of the post, and that identifies the type of the work carried into it (the signal from here is also transmitted to the total counting machine 14 so that the probe of the post-process measuring head 20 is Selected), and the work number counter 34 is provided with a counter value for each kind of work, and if the first sensor 36 detects the carry-out of the work from the processing machine 10, The counter value corresponding to the type of work (identified by the identification sensor 50) is incremented by 1, while the second sensor 3
When the carry-in of the work into the total number measuring machine 38 is detected by 8, the counter value corresponding to the kind of the work (identified by the identification sensor 52) is decreased by 1, so that the standby work for each work type is decreased. The number can be taken.

Since the fact that the work has been carried into the total counting machine 14 can be indirectly detected by using the signal from the identification sensor 52, when the identification sensor 52 is provided, the second sensor 38 is provided. Can be omitted.

Furthermore, as shown in FIG.
It is also possible to apply the present invention to a fixed point correction device used for a confluence type processing line having a plurality of, and only one total number measuring machine 14 and capable of processing only one type of work. In this case, there is only one type of work, but it is necessary to correct the processing conditions for each processing machine 10 (for example, even if the type of the processing machine 10 is 1, It is desirable that the "standby work number acquisition means 2" in the present invention be, for example, as follows, since the machining characteristics are usually different for each.

That is, as shown in the figure, the work number counter 34, the first and second sensors 36, 38 are included, and the first sensor 36 is arranged for each processing machine 10, while the second sensor Although the sensor 38 is also arranged for each processing machine 10, it is also arranged at the end position of each of a plurality of partial processing lines extending in parallel downstream from each processing machine 10, and the work number counter 34 is arranged for each processing machine 10. If the counter value is prepared for each (i.e., for each number for identifying the processing machine 10) and each of the first sensors 36 detects that the work is carried out from each processing machine 10, the processing machine that processed the work is processed. The counter value corresponding to the number 10 (which is found from the location of the first sensor 36 that has detected the work unloading) is incremented by 1, while each second sensor 38 causes the total number measuring instrument 38 to When the carry-in of the work is detected, the counter value corresponding to the number of the processing machine 10 that processed the work (which is known from the location of the second sensor 38 that has detected the work carry-in) is decreased by 1. It is desirable to acquire the number of standby works for each processing machine 10. In addition, in this merging type processing line, 100
Since the work carried out toward the second sensor 3 is designed to be immediately carried into the total number measuring machine 14,
8 is the processing machine 1 for detecting the introduction of the work into the total counting machine 14.
It can be done every zero.

Furthermore, the present invention can be applied to a fixed-point correction device used for the above-mentioned flow dividing type processing line for processing a plurality of types of works. In this case, since it is necessary to correct the processing conditions not only for each processing machine 10 but also for each type of work, the "standby work number acquisition means 2" in the present invention is as follows, for example. It is desirable to do.

That is, as shown in FIG. 12, in addition to the work number counter 34, the first and second sensors 36, 38, (a) the work placed at the entrance of each processing machine 10 and carried into it. An identification sensor 70 for identifying the type of
(b) An identification sensor 72 that is arranged at the entrance of the total counting machine 14 and identifies the type of the work carried into it is included, and the work number counter 34 is set to the work type and the number of the processing machine 10. A counter value is prepared for each combination, and if each first sensor 36 detects that the work is carried out from each processing machine 10, the type of the work (identified by the identification sensor 70) and the work are identified. The counter value corresponding to the combination with the number of the processed processing machine 10 (which is found from the location of the first sensor 36 that has detected the work unloading) is incremented by 1, while each second sensor 38 causes the total counting machine 38 to operate. If the loading of the work into the
Type of work (identified by the identification sensor 72)
By decrementing the counter value corresponding to the combination of the number and the number of the processing machine 10 that processed the work (which is found from the location of the second sensor 38 that has detected the introduction of the work) by 1, It is desirable to acquire the number of standby works for each combination with the type of work.

If the identification sensor 72 identifies not only the type of the workpiece but also the type of the processing machine 10 that processed the workpiece (for example, the processing machine 10 that processed the workpiece).
No. of the processing machine 10 can be directly or indirectly attached to the processing machine 10 and the number can be read by the identification sensor 72, it is possible to identify the type of the processing machine 10 that processed the workpiece), and the second sensor 38 can be omitted. You can also

Further, in the above-described embodiment, a plurality of processing parts are set for one work, each of the plurality of works is in sequence, and the plurality of processing parts in each work are different from each other. In addition to the simultaneous machining, the dimensional information is obtained for each machined part, and the correction value of the machining condition of each machined part is individually determined based on the dimensional information. However, at least one of the plurality of processed parts is represented.
Although the dimensional information is acquired only for the individual pieces and the correction value of the processing condition is actually determined only for the representative processed part,
For other processed parts, the present invention can be implemented by diverting the determined correction value and omitting the actual determination of the correction value.

Further, in the above-mentioned embodiment, the "workpiece" in the present invention has the cylindrical surface which extends straight without changing the diameter and is used as the processing portion. It is also possible to implement the present invention assuming that there is a cylindrical surface that extends straight while changing the above, and that there is a processed portion. In the former case, since the diameter of each cylindrical surface is usually measured as one dimension, that one dimension is the "dimension" in the present invention. On the other hand, in the latter case, since the dimension is usually measured at each axial position of the cylindrical surface, the dimension at each axial position is the “dimension” in the present invention.

In addition to these, the present invention can be carried out in various modified and improved modes based on the knowledge of those skilled in the art without departing from the scope of the claims.

[Brief description of drawings]

FIG. 1 is a block diagram conceptually showing the structure of the present invention.

FIG. 2 is a diagram showing a configuration of a processing system including a feedback type fixed point correcting device according to an embodiment of the present invention.

FIG. 3 is a ROM of a computer of the control device in FIG.
4 is a flowchart showing a program stored in the.

4 is a graph showing a plurality of membership functions stored for an error value R in a ROM of the control device in FIG.

5 is a graph showing a plurality of membership functions stored with respect to a differential value T in the ROM of the control device in FIG. 2. FIG.

6 is a graph showing a plurality of membership functions stored with respect to a correction value U in the ROM of the control device in FIG. 2. FIG.

7 is a graph showing a plurality of membership functions stored with respect to the dead time MS in the ROM of the control device in FIG.

8 is a diagram conceptually showing the structure of a data bank in FIG.

FIG. 9 is a graph showing an example of measured values and a moving average value acquired for the measured values in the above-described example.

FIG. 10 is a diagram for explaining the principle of acquiring the number of standby works in the fixed-dimension point correction device that is another embodiment of the present invention.

FIG. 11 is a diagram for explaining the principle of acquiring the number of standby works in the fixed-dimension point correction device that is still another embodiment of the present invention.

FIG. 12 is a diagram for explaining the principle of obtaining the number of standby works in the fixed-dimension point correction device that is still another embodiment of the present invention.

[Explanation of symbols]

 10 Processing machine 14 Total number measuring machine 18 In-process measuring head 20 Post-process measuring head 22 Sizing device 28 Control device 32 Data bank 34 Work counter

Claims (1)

[Claims] 1. A processing tool control means for controlling a processing tool for sequentially processing a plurality of workpieces of at least one type according to processing conditions, and (b) a dimension for sequentially measuring the dimensions of a plurality of processed workpieces. A feedback type machining condition correction device used by being connected to a measuring means, wherein dimension information acquisition is performed for each type of workpiece, based on the measurement result by the dimension measuring means. Means, a standby workpiece number obtaining means for obtaining the number of workpieces processed by the processing tool, which are waiting for the dimension measurement by the dimension measuring means, for each type of the workpiece, and is processed next by the processing tool. The correction values of the machining conditions of the work to be processed are respectively calculated by the dimension information acquisition means and the standby work number acquisition means for the work of the same type as the work. Feedback type processing condition correction unit which comprises a processing condition correction means for determining based on the acquired size information and the number of waits workpiece.