JPH1015780A - Sizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a sizing device for generating a sizing signal with reference of a workpiece having different sizing values in directions. SOLUTION: A sizing device is provided with a measuring head 13 for generating a measuring signal showing the dimension of a workpiece 100a, signal processing circuits 18, 19, 20, 21, 22 for processing the measuring signal and a calculation processing means 25 for outputting the sizing signal to vary working requirements when a desired dimension is reached from the output signal of the signal processing circuit. The signal processing circuit is constituted to convert the measuring signal to a signal suited to process the measuring signal with the calculating processing means. Then, the signal processing circuit is limited in the optimum input range of the measuring signal converted to a signal suited to be processed by the calculation processing means. The signal processing circuit is provided with size shift circuits 16, 17 for shifting the strength of the measuring signal by a set shift amount and shift amount setting means 28, 29 to set a shift amount of the size shift circuit for comparing the measuring signal to a predetermined threshold value so that the measuring signal enters the optimum input range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device for measuring a dimension of a machined portion of a workpiece during machining and outputting a measurement signal called a sizing signal when the dimension reaches a predetermined machining dimension. The present invention relates to a sizing device, and more particularly to a sizing device capable of outputting a sizing signal even for a work other than a cylinder.

[0002]

2. Description of the Related Art It has been practiced to improve the processing accuracy by measuring the dimensions of a processed portion of a work during processing. For example, if a target dimension is set in advance, and a processing stop signal is output when or before the measured dimension reaches the target dimension, and processing is stopped, high-precision processing is possible.
A device that measures the dimensions of the processed portion during processing and outputs a signal for controlling the processing operation is called a sizing device.

[0003] For example, in grinding, the degree of surface finish varies depending on the processing amount per unit time, that is, the speed at which the grindstone is moved with respect to the work. Therefore, in the grinding process, high-speed processing is performed up to a dimension larger than the target dimension by a predetermined amount, and thereafter, processing is performed slowly so as to improve the finish, so that high-speed, accurate and good finish is achieved. ing. In practice, it is common to perform processing in the order of a rough polishing step with a high processing speed, a fine polishing step with a low processing speed, and a spark-out step performed to improve the finished state with almost no processing. . In the sizing device, the dimensions of roughing to fine polishing, fine polishing to spark out, and processing stop are set in advance.
It is configured to output a fixed size signal when the set size is reached.

[0004] In grinding, since the processing is performed by bringing a rotating grindstone into contact with a rotating work, generally the outer diameter of the work is important, and a sizing device also measures the outer diameter and outputs a sizing signal. Output. The measuring head that measures the dimensions of the work used in such a sizing device can be basically any type that can measure the outer diameter of the processed part even during processing. Although not shown, a sizing device using a measuring head of a type in which a most commonly used contact comes into contact with a portion to be measured and detects displacement of the contact will be described as an example.

When the outer diameter of a workpiece is measured with a cylindrical rotating body, a probe of a measuring instrument such as a stylus in contact with the outer diameter portion is moved to a position symmetrical with respect to the rotation axis of the rotating body. Measure while setting and rotating the work. The value of the outer diameter was calculated from the sum of the outputs of the two tracings. Normally, a master having a target shape serving as a reference is set, and measurement is performed after setting a measurement value when the master is measured to be zero. Such a setting operation is called a master set.

FIG. 5 is a diagram showing a basic configuration of a conventional processing system using a sizing device having a differential transformer in a detection unit. As shown in FIG. 5, the grinding wheel 1 rotating at high speed
In step 11, the workpiece 100 is ground. Work being processed 100
The measuring elements 11 and 12 extending from the measuring head 13 are in contact with the outer diameter portion of the measuring element 13. First and second detectors 14 and 15 each composed of a differential transformer or the like are provided in the head 13 to detect displacements of the tracing styluses 11 and 12, respectively. Outputs of the first and second detectors 14 and 15 are input to first and second size shift circuits 16 and 17, and then converted into DC signals by first and second rectifier circuits 18 and 19, and are added to an adder circuit. Then, a signal indicating the sum of them, that is, a measurement signal indicating the outer diameter of the workpiece 100 is output. Minimum value storage circuit 21
Is a circuit for detecting and storing the minimum value of the output of the adder circuit 20. The analog / digital (A / D) conversion circuit 2
4 converts the output of the minimum value storage circuit 21 into a digital signal, and the computer 25 reads it. In the computer 25, the read value is compared with a preset sizing value which is a dimension value of the roughening to the fine polishing, a sparkout from the fine polishing, and the processing stop. When the value is reached, a predetermined sizing signal is obtained. Is output. Normally, the signal processing / conversion unit and the data processing unit are collectively called a sizing device, but the sizing device including the measuring head 13 may also be called a sizing device. Here, a sizing device including the measuring head 13 is used, but is not limited to this. Note that the minimum value storage circuit 21 may be a circuit that detects and holds the minimum value from the value of the digital signal output from the A / D conversion circuit 21, and may be realized by the computer 25.

In the configuration shown in FIG. 5, the output of the addition circuit 20 is A
After the digital signal is converted by the / D conversion circuit 21, it is read by a computer 25 constituted by a microcomputer or the like, and is compared with a fixed size value, but the output of the addition circuit 20 is set in advance. It is also possible to provide a circuit for comparing with an analog voltage corresponding to the sizing value to generate a sizing signal. In recent years, it is common to process digitally measured values with a computer, so in the following description, an example of computer processing will be described. However, the present invention is not limited to this and can be applied to any method. It is.

What matters when measuring dimensions is the measurement range and measurement accuracy. The displacement can be measured in a range where the output signal changes with respect to the displacement (preferably a range in which the output signal changes linearly). However, the dynamic range of the post-processing circuit and the conversion range of the A / D conversion circuit 21 can be measured. If it is made to correspond to a range, there arises a problem that measurement cannot be performed with sufficient accuracy. Therefore, the measurement accuracy can be varied by changing the amplification factor of the post-processing circuit in accordance with the output of the measuring head, or a predetermined signal value can be added to the post-processing circuit to move (shift) the range in which measurement can be performed with high accuracy. ) To be able to do it. The first and second size shift circuits 16 and 17 in FIG. 5 are circuits for that purpose. Although the detailed configuration of the size shift circuit will be described later, in the circuit of FIG. 5, the first and second size shift circuits 16 and 17 receive signals from the first and second detection units in response to a size shift signal from the computer 25. Is added to a signal having a predetermined amplitude to convert the signal into a signal having a predetermined range of amplitude. The measured value is a value obtained by adding the size shift to the value detected at this time. The setting of the size shift circuit is performed according to the shape of the work set in advance by the operator.

[0009]

If the work is a cylindrical object, the displacement of the probe is small even if the work is rotated, and the range in which the measurement can be performed with high accuracy at the time of setting the master is set according to the shape of the work. Processing can be controlled using a sizing device as shown in FIG. However, for example, when the work has a large diameter (long diameter) and a small diameter (short diameter) depending on the direction, such as the camshaft shown in FIG. 6,
Measurement cannot be performed with the same size shift circuit setting. The workpiece rotates around the rotation center 101 during processing, but if the first probe 11 comes into contact with the workpiece 100 from above, the first probe 11 will move upward when a large radius portion of the long diameter comes upward. When the major axis comes to the side from this state, the first gauge head 11 moves downward, and maintains substantially the same displacement until the large radius part of the major axis comes to the opposite side. The displacement of the second probe 12 is opposite to that of the first probe 1. Therefore, the amplitude of the signal output from the first detection unit 13 greatly changes when the large radius part of the large diameter comes upward and when the large radius part of the large diameter comes downward, and the setting of the first size shift circuit is the same. Then, a situation arises in which one state can be measured but cannot be measured in the other state.

Therefore, when a fixed size signal for a work such as a camshaft shown in FIG. 6 is generated, the minor dimension can be measured when the large radius part of the workpiece comes to the side.
A sizing signal was generated only for the minor axis. But,
In this case, since the dimension cannot be controlled in the major axis direction, there is a problem that high-precision processing is difficult. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to realize a sizing device that generates a sizing signal even for a workpiece having a different sizing value depending on a direction with a simple configuration.

[0011]

In order to achieve the above object, a sizing apparatus according to the present invention compares a measurement signal with a predetermined threshold value and measures a portion of a workpiece by measuring the measurement signal. A shift amount setting means for determining whether or not the size shift circuit is to be set and setting a shift amount of the size shift circuit is provided, and the size shift circuit is switched according to a plurality of dimensions which are processing target values.

In other words, the sizing device of the present invention comprises a measuring head for outputting a measuring signal indicating a dimension of a processed portion of a workpiece, a signal processing circuit for processing a measuring signal output from the measuring head, and a signal processing circuit. A processing means for outputting a fixed size signal for changing the processing condition when the dimension of the processed portion reaches a preset target dimension from the output signal of A sizing device for converting a measurement signal into a signal suitable for processing by arithmetic processing means, and a signal processing circuit for optimal input of the measurement signal capable of converting the measurement signal into a signal suitable for processing by the arithmetic processing means. Limited range. In order to achieve the above object in such a sizing device, a size shift circuit for shifting the intensity of the measurement signal by a set shift amount, a measurement signal is compared with a predetermined threshold value, and the measurement signal is adjusted to an optimum input range. And a shift amount setting means for setting a shift amount of the size shift circuit so as to fall within the range.

In the case of an object to be measured whose dimensional value varies depending on the direction, the value of the measurement signal greatly changes according to the rotation of the object to be measured. Therefore, the signal processing circuit includes a minimum value storage circuit that stores the minimum value of the measurement signal, and a maximum value storage circuit that stores the maximum value of the measurement signal. Of the minimum value or the minimum value stored in the minimum value storage circuit or the maximum value storage circuit is changed in accordance with the setting of the shift amount.

In the case of an ordinary sizing device, the measuring head has two detecting sections for detecting two surface positions of the workpiece, and the signal processing circuit has a measuring section output from the two detecting sections. In general, the size of the workpiece is calculated from the sum of the signals. In this case, the size shift circuit also shifts the intensity of the measurement signal output from the two detectors so as to shift the intensity of the measurement signal.
Provided. In this case, it is desirable that the shift amount setting means independently sets the shift amounts of the two size shift circuits.

In the sizing apparatus according to the present invention, the shift amount setting means compares the measurement signal with a predetermined threshold to determine which part of the workpiece the measurement signal is to measure, and the size shift circuit , The measurement range of the size shift circuit can be switched according to a plurality of dimensions that are the processing target values. Therefore, it is possible to measure even an object to be measured whose dimensional value differs depending on the direction.

In the case of an object to be measured whose dimensional value differs depending on the direction, there are a plurality of dimensions that need to be managed, and the value of the measurement signal is slightly larger than the minimum and maximum values of these multiple dimensions (processing). (The value obtained by adding the minute).
Therefore, the signal processing circuit is provided with a minimum value storage circuit and a maximum value storage circuit, and the arithmetic processing means stores the minimum value storage circuit and the maximum value storage in accordance with the setting of the shift amount of the size shift circuit by the shift amount setting means. By reading either the minimum value or the minimum value stored in the circuit, it is determined whether the size of the target processed portion has reached a preset target size.

In a normal sizing device, the measuring head has two tracing styluses and two detecting portions for detecting the displacement of the tracing stylus, and the signal processing circuit detects the sum of the measuring signals output from the two detecting portions. It is common to calculate the dimensions of the workpiece. In this case, two size shift circuits are provided so as to shift the intensities of the measurement signals output from the two detectors, respectively, but the shift amounts of the two size shift circuits are independently set by the shift amount setting means. Then, it is possible to cope with an object to be measured having various shapes. For example, if the workpiece has a shape as shown in FIG. 6, usually, two size shift circuits are set to a shift amount corresponding to the short diameter, and the shift corresponding to the long diameter is performed only when the long diameter comes. Set to quantity. Therefore, the two size shift circuits are not simultaneously set to the shift amount corresponding to the long diameter. On the other hand, for example, when processing an elliptical shape, the two measurement signals change in the same way.
The shift amounts of the size shift circuits may be switched simultaneously.

[0018]

FIG. 1 is a block diagram showing the overall configuration of a processing system according to an embodiment of the present invention. In FIG. 1, reference numeral 100a denotes a work, 11 and 12 denote probes, 13 denotes a measurement head, and 14 and 15 denote probes 11 and 12.
The first and second detectors 16 and 17 are composed of differential transformers for detecting the displacements of the first and second detectors, respectively. The first and second detectors 16 and 17 shift the intensity of the measurement signal output from the first and second detectors 14 and 15, respectively. Reference numerals 18 and 19 denote first and second rectifier circuits for rectifying the outputs of the first and second size shift circuits 16 and 17, respectively, to convert them into DC signals, and reference numeral 20 denotes first and second rectifier circuits. An addition circuit 21 calculates the sum by adding the outputs of the rectifier circuits 18 and 19, a minimum value storage circuit 21 detects and stores the minimum value of the output of the addition circuit 20, and 2
2 is a maximum value storage circuit for detecting and storing the maximum value of the output of the adder circuit 20, 23 is a switch for selecting one of the outputs of the minimum value storage circuit 21 and the maximum value storage circuit 22, and 2 is a switch.
Reference numeral 4 denotes an A / D conversion circuit for converting the output of either the minimum value storage circuit 21 or the maximum value storage circuit 22 selected by the switch 23 into a digital signal; 25, a computer constituting arithmetic processing means; The first D / A conversion circuit sets the shift amount of the first size shift circuit 16 in accordance with the set value from 25, and the 27 sets the shift amount of the second size shift circuit 17 in accordance with the set value from the computer 25. A second D / A conversion circuit, 28 is a first shift amount setting circuit, 29 is a second shift amount setting circuit, and 30 to 32 are parts constituting the first shift amount setting circuit.
Denotes an auxiliary rectifier circuit, 31 denotes a threshold value setting circuit, and 32 denotes a comparison circuit. The second shift amount setting circuit 29 has the same configuration as the first shift amount setting circuit 28.

The first and second detectors 14 and 1 shown in FIG.
5, first and second rectifier circuits 16 and 17, adder circuit 20,
Since the A / D conversion circuit 24 is the same as that used in the conventional sizing device, the description is omitted here. FIG.
FIG. 3 is a diagram showing a configuration of a part of the first detection unit 14 and a first size shift circuit 16, and a second size shift circuit 17 has a similar configuration. FIG. 3 is a diagram showing signals in the circuit of FIG.

As shown in FIG. 2, reference numerals 40 to 44
Is a part that constitutes a differential transformer of the first detection unit 14, and an iron core 40 provided at one end of the tracing stylus 11 is displaced in a primary coil 41 and two secondary coils 42 and 43. An AC signal is applied to the primary coil 41 from an oscillator 44, and a difference occurs between the induced electromotive forces induced in the secondary coils 42 and 43 according to the position of the iron core 40. The difference between the induced electromotive forces of the secondary coils 42 and 43 is amplified by the amplifier 45.
The signal output from the amplifier 45 is an AC signal as shown in FIG. 3A, and is an AC signal that changes at the same cycle as the AC signal output from the oscillator 44. This AC signal changes its amplitude in accordance with the position of the iron core 40.
Specifically, when the iron core 40 is at an intermediate position between the two secondary coils 42 and 43, the induced electromotive force induced in the two secondary coils 42 and 43 is equal, and the signal output from the amplifier 45 is zero. is there. As the iron core 40 is displaced from this state, the amplitude of the AC signal output from the amplifier 45 increases. When the displacement of the iron core 40 is small, the signal becomes as shown by b in the figure, and when the displacement of the iron core 40 becomes large, the signal becomes as shown by a. If the size shift circuit is not provided, the AC signal output from the amplifier 45 is rectified by a rectifier circuit, so that a DC signal having a voltage corresponding to the amplitude of the AC signal as shown in (2) of FIG. can get. The voltage of this DC signal indicates displacement. This is the operation of the differential transformer.

In a range where the difference between the induced electromotive forces induced in the two secondary coils 42 and 43 according to the displacement of the iron core 40 simply changes, the displacement of the iron core 40 is corrected by having a linearity. It is possible to measure. The resolution of the measurement is determined by the ability to discriminate the change of the rectified DC signal. For example, when the measurement signal is A / D converted and read as a digital signal, if it is converted into a 10-bit digital signal, it can be decomposed into 1024 levels. If the measuring range of the measuring head is ± 10 mm, the resolution is about 20 μm. Therefore, when it is necessary to measure at a resolution of 2 μm or less, the measurement range needs to be a small range of ± 1 mm or less. Conversely, if the measurement range is ± 50 mm, the resolution will be very large at 100 μm.

Therefore, the resolution of measurement can be changed, and the range in which measurement can be performed with high resolution can be switched. The resolution of the measurement is changed by changing the amplification factor of the signal, but the range that can be measured at a high resolution is switched by a size shift circuit. In FIG.
The size shift circuit includes an adder circuit 46 and a variable amplifier circuit 48.
The shift amount in the size shift circuit is determined by converting the set value from the computer 25 into an analog signal by the D / A conversion circuit 26 and setting the amplification factor of the variable amplifier circuit 48. For example, when the output of the amplifier 45 is a signal indicated by c in (3) of FIG. 3, the signal from the oscillator 44 is inverted and amplified by the variable amplifying circuit 48 and an amplitude close to the output of c as indicated by d is obtained. Signal having the opposite phase. The signal d of the opposite phase and the amplifier 4
When the output c of 5 is added, a signal as shown by e is output. In this way, by appropriately setting the set value from the computer 25 to the D / A conversion circuit 26 in accordance with the output from the amplifier 45, that is, the measurement unit, the amplitude of the signal output from the addition circuit 46 is always adjusted. It can be in a predetermined range. If the amplification factor of each circuit is set so that the limit value of such a range becomes the maximum value and the minimum value of the A / D conversion circuit, the measurement can be performed with high accuracy in the entire measurement range. This is the configuration and function of the size shift circuit. The measurement value at the time of size shift is obtained by adding the value of the size shift to the measured value.

There are provided first and second size shift circuits for performing the above-described size shift on the outputs of the first detector 14 and the second detector 15. First and second
The shift amount of the size shift circuit is determined by the first D / A conversion circuit 2
6 and the setting value to the second D / A conversion circuit 27 can be set independently. Outputs of the first and second size shift circuits are first and second rectifier circuits 18 and 1 respectively.
9 and converted by the adder 20 into the first and second DC signals.
The sum of the outputs of the rectifier circuits 18 and 19 is calculated. The output of the adding circuit 20 corresponds to the diameter of the work 100. The output of the addition circuit 20 is a minimum value storage circuit 21 and a maximum value storage circuit 22.
Is input to The maximum value storage circuit 22 is formed of, for example, a known peak hold circuit, and stores the maximum value of the input signal after being reset by a reset signal applied from the outside. The minimum value storage circuit 21 is also the maximum value storage circuit 22.
And the only difference is that the input signal is inverted. The switch 23 selects which output of the minimum value storage circuit 21 and the maximum value storage circuit 22 is input to the A / D conversion circuit 24.

The auxiliary rectifier circuit 30 of the first shift amount setting circuit 28 has the same configuration as the first and second rectifier circuits 18 and 19, and converts the output of the first detector 14 into a DC signal.
The signal input to the auxiliary rectifier circuit 30 is a signal that has not been size-shifted, and is a signal indicating the entire measurement range of the first detection unit 14. The threshold value setting circuit 31 includes the workpiece 1
A threshold value is set in advance according to the shape of 00. The threshold value setting circuit 31 is configured by, for example, a volume and allows a user to directly set a threshold value, or can set the threshold value via a computer using a D / A conversion circuit or the like. it can. The comparison circuit 32 compares the output of the auxiliary rectifier circuit 30 with a threshold value and sends the comparison result to the computer 25.

FIG. 4 shows a work 100a as shown in FIG.
1st and 2nd shift amount setting circuit 2 when
FIGS. 8A and 8B are diagrams illustrating output changes of auxiliary rectifier circuits 8 and 29, and
And g indicate the outputs of the auxiliary rectifier circuits of the first and second shift amount setting circuits, respectively, and h and i indicate the threshold values. As shown, the output of the auxiliary rectifier circuit of the second shift amount setting circuit 29 is shifted by 180 ° with respect to the output of the auxiliary rectifier circuit 30 of the first shift amount setting circuit 28. Here, the first
When the output f of the auxiliary rectifier circuit 30 of the shift amount setting circuit 28 is larger than the threshold value h, a value is set in the first D / A conversion circuit 26 so that the measurement range corresponds to the larger radius of the major axis.
At other times, a value is set in the first D / A conversion circuit 26 so that the measurement range corresponds to the minor axis. Similarly, the output g of the auxiliary rectifier circuit of the second shift amount setting circuit 29 is the threshold value i
When the value is larger, the second D / A conversion circuit 27 sets a value for setting a measurement range corresponding to the larger radius of the major axis. At other times, the second D / A conversion circuit 27 sets a value for setting a measurement range corresponding to the shorter diameter. Set.

Here, the first and second size shift circuits 1
If both 6 and 17 are set in the measurement range corresponding to the minor axis, the output of the minimum value storage circuit 21 is input to the A / D conversion circuit 24 because the machining state of the minor axis is a problem. Then, the computer 25 can read the output of the minimum value storage circuit 21, and if one of the first and second size shift circuits 16 and 17 is set in the measurement range corresponding to the long diameter, Since the processing state is a problem, the output of the maximum value storage circuit 22 is input to the A / D conversion circuit 24 so that the computer 25 can read the output of the maximum value storage circuit 22. The values of the minimum value storage circuit 21 and the maximum value storage circuit 22 are reset when the respective values are switched to be read. The computer 25 generates a fixed size signal based on the value thus read.

In the above-described embodiment, the measurement can be performed when the large radius portion reaches the first and second tracing styluses 11 and 12. The second shift amount setting circuit may not be provided.
In the above embodiment, the case where the work having the shape shown in FIG. 6 is measured has been described. For example, even when the work having the elliptical shape is processed using the apparatus of the embodiment, the fixed-size signal is generated. It is also possible to make it. In that case, only one of the first and second shift amount setting circuits may be provided, and the first and second size shift circuits 16 and 1 may be provided.
The shift amount of 7 is switched in the same manner.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, the minimum value storage circuit 21 and the maximum value storage circuit 22 are realized by analog circuits. However, if the sampling speed of the A / D conversion circuit is sufficiently high and the processing speed of the computer 25 is sufficiently high, the output of the addition circuit 20 is sufficient. May be converted into a digital signal by an A / D conversion circuit, and then the minimum value and the maximum value may be calculated by digital processing.

The first and second shift amount setting circuits 28
After the outputs of the first and second D / A conversion circuits 2 and 29 are input to the computer 25 once,
The values that determine the measurement range were set in 6, 27.
A circuit whose value is selected by the output of the first and second shift amount setting circuits 28 and 29 is provided, and the output is output by the first and second D /
It is also possible to input to the A conversion circuits 26 and 27.

Furthermore, if the first and second rectifier circuits 18, 19 and the adder circuit 20 have sufficiently high accuracy over the entire measurement range and define the resolution, the number of bits of the A / D converter circuit is sufficient. Alternatively, a circuit for shifting the output of the first and second rectifier circuits 18 and 19 may be used as the size shift circuit. Furthermore, in the above embodiment, the diameter of the workpiece can be measured using two probes, but it is also possible to use one probe to generate a sizing signal only by the change. In this case, only one of the measuring unit, the size shift circuit, the rectifier circuit, the D / A converter circuit, and the shift amount setting circuit is required, and the adder circuit 20 is not required.

[0031]

As described above, according to the present invention,
Since a plurality of different dimensions can be measured and managed depending on the direction, a sizing device capable of managing a plurality of dimensions other than a cylindrical shape and corresponding to a workpiece (work) that needs to generate a sizing signal. Can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a sizing device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a size shift circuit in the embodiment.

FIG. 3 is a diagram illustrating processing in a size shift circuit according to the embodiment.

FIG. 4 is a diagram illustrating switching of a size shift amount and switching of reading of a minimum value and a maximum value in the present embodiment.

FIG. 5 is a diagram showing a configuration of a conventional sizing device.

FIG. 6 is a diagram showing an example of a workpiece shape in which it is difficult to generate a sizing signal in a conventional sizing device.

[Explanation of symbols]

 11, 12 ... Probe 13 ... Measuring head 14, 15 ... Detection unit 16, 17 ... Size shift circuit 18, 19 ... Rectifier circuit 20 ... Addition circuit 21 ... Minimum value storage circuit 22 ... Maximum value storage circuit 24 ... A / D Conversion circuit 25 ... Computer 26 ... First D / A conversion circuit 27 ... Second D / A conversion circuit 28,29 ... Shift amount setting circuit 100,100a ... Workpiece (work)

Claims (3)

[Claims] 1. A measuring head (13) for outputting a measuring signal indicating a dimension of a processed portion of a workpiece (100), and a signal processing circuit (18,) for processing the measuring signal output from the measuring head (13). 19, 20, 21, 22) and an arithmetic processing means for outputting, from an output signal of the signal processing circuit, a fixed size signal for changing a processing condition when a size of a processed portion reaches a preset target size. (25)
A sizing device for converting the measurement signal output from the measurement head (13) into a signal suitable for processing by the arithmetic processing means (25), the signal processing circuit comprising: The optimal input range of the measurement signal which can convert the measurement signal into a signal suitable for processing by the arithmetic processing means (25) is limited, and the intensity of the measurement signal is shifted by a set shift amount. A size shift circuit (16, 17) for comparing the measured signal with a predetermined threshold value, and shifting the size shift circuit (16, 17) so that the measured signal falls within the optimum input range. A sizing device comprising: shift amount setting means (28, 29) for setting an amount. 2. The signal processing circuit includes a minimum value storage circuit (21) that stores a minimum value of the measurement signal, and a maximum value storage circuit (22) that stores a maximum value of the measurement signal. Arithmetic processing means (25) stores the minimum value storage circuit (21) and the maximum value storage circuit (22) stored in the minimum value storage circuit (21) in accordance with the setting of the shift amount of the size shift circuit by the shift amount setting means. The sizing apparatus according to claim 1, wherein a change is made between a minimum value and the minimum value. 3. The measuring head (13) includes two detectors (14, 14) for detecting two surface positions of the processed part.
15), wherein the size shift circuit includes the two detection units (14, 1).
5) two size shift circuits (16, 17) for respectively shifting the intensity of the measurement signal output from the above (5), wherein the shift amount setting means is configured to perform the shift of the two size shift circuits (16, 17). 3. The sizing device according to claim 2, wherein the amounts are independently set.