JPH08257905A - Automatic sizing device - Google Patents

Abstract

PURPOSE: To provide an automatic sizing device which can discriminate a precise contact position of a working tool with a work, thus decreasing dead time even if a working condition is changed by wear to the processing tool, the tolerance of the work or the like. CONSTITUTION: An automatic sizing device for a cylindrical outside diameter grinding machine measures the dimension of a work 100 through a measuring part 12 in working and stops the movement of a wheel spindle stock 40 when the work 100 has reached its required size. At this moment, it is possible to detect wear to a grinding wheel 10 and the amount of an error in thermal deformation or the like of the wheel spindle stock 40 by a deviation from the value zero of the indicator of an electric micrometer 44 (indicated with an indicating value 46) which shows the position of the wheel spindle stock 40 fitted separately. An automatic zero adjusting circuit 48 is operated, and the electric micrometer 44 is zero-adjusted so that the position of the wheel spindle stock 40 may show zero. In processing the next work, it is possible to make such control as the contact starting position of the grinding wheel 10 with the work 100 can be always the same, from the position of the wheel spindle stock 40 and the dimension of the work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic sizing device, and more particularly to an in-process type automatic sizing device for continuously measuring the size of a workpiece and transmitting a processing stop signal when the size reaches a predetermined size. Regarding

[0002]

2. Description of the Related Art An in-process type automatic sizing device applied to a grinder or a lathe, etc., when a work dimension reaches a preset dimension during machining, the rough sizing to the fine sizing The machining time is shortened by switching the machining speed from high-speed machining such as (spark-out) to low-speed machining and using the high-speed machining as much as possible.

Further, as described below, until just before the machining tool comes into contact with the work material, the machining tool is fast-forwarded at a speed faster than the above-mentioned rough-grinding feed so as to reduce wasteful time as much as possible. That is, the maximum size of the processing tool,
The contact position between the machining tool and the work is calculated from the maximum value of the work material dimensional tolerance, and deceleration from the fast feed to the rough grinding feed is performed immediately before the work (first method).

Further, when the machining tool comes into contact with the work, the load current of the spindle motor increases. Therefore, the contact between the machining tool and the work is detected from the minute change in the current, and after the work is contacted, deceleration to the roughing feed is performed. Is performed (second method). In addition, acoustic emission (AE) generated at the time of contact
There is also proposed a method in which the contact is determined by detecting the value, and after the contact with the work, the deceleration to the roughing feed is performed (third method).

[0005]

However, in the first method, when the deceleration position is fixed, the tool diameter decreases due to the friction of the working tool, or the work size tolerance is close to the minimum value. Since the switching point to deceleration is too early, wasteful time becomes long and work efficiency deteriorates.

Further, in both the second and third methods, since it is decelerated to the roughing feed after detecting that the working tool has contacted the work, another drawback occurs. That is, if the approaching speed by fast-forwarding is high, there is a risk that not only the work will be damaged at the time of contact but the work will be a defective product, but also the processing tool may be damaged in some cases. The present invention has been made in view of such circumstances, wear of the processing tool, even if the processing conditions change due to the tolerance of the work material, etc., without directly measuring the wear amount of the processing tool, An object of the present invention is to provide an automatic sizing device that accurately determines the contact position of a work and reduces the dead time.

[0007]

In order to achieve the above object, the present invention continuously measures the size of a work piece while processing the work piece with a working tool of a working portion, and reaches a predetermined size. Then, in an in-process type automatic sizing device that sends a machining stop signal, the driving means for moving the machining part toward and away from the workpiece and the position of the machining part moved by the driving means are detected. Based on the detection values from the processing portion position detecting means, the workpiece dimension detecting means for continuously detecting the dimension of the workpiece, and the processing portion position detecting means and the dimension detecting means of the workpiece. , A calculation means for obtaining a contact position of the processing tool and the work piece, and a feed speed of the processing part from a high speed feed to a low speed feed in front of the surface of the work piece based on the contact position calculated by the calculation means As the drive means And control means for controlling is characterized in that it is composed of.

[0008]

According to the present invention, the dimension of the workpiece is detected by the dimension detecting means of the workpiece and the position of the machining tool is measured by the machining tool position detecting means. And
Based on the detected values from the dimension detection means of the workpiece and the machining tool position detection means, the contact position of the machining tool and the workpiece is calculated by the computing means. The control means drives the work tool to advance and retreat on the basis of the contact position calculated by the calculation means so that the feed speed of the work tool is changed from a high speed feed to a low speed feed in front of the work surface. To control. As a result, the position at which the feed speed of the machining tool is switched from high-speed feed to low-speed feed can be made variable according to the size of the workpiece, and a constant amount of switching from high-speed feed to low-speed feed It can be done from the front.

According to another aspect, the machining tool position detecting means is provided with a zero point adjusting means for setting a zero point of the machining tool, and when the workpiece is machined to a design dimension and a machining stop signal is transmitted. , Adjust the position of this machining tool to the zero point. As a result, the contact position between the machining tool and the workpiece can always be detected accurately regardless of the wear of the machining tool and the dimensional difference of the work material.

As described above, the dead time can be reduced in the working process.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an automatic sizing device according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of an automatic sizing device for a cylindrical outer diameter grinding machine to which the automatic sizing device according to the present invention is applied. The work 100
In the following description, the radius of the design dimension is WD, the machining allowance is δ (see FIG. 4), the reference position of the wheel head 40 is GP, and the movement amount from the reference position is α. The movement of the grindstone base 40 gradually decreases α, and the machining allowance δ also decreases accordingly.

The automatic sizing device shown in FIG. 1 mainly includes a work size detecting section 13 for detecting the outer diameter of the work 100.
A grindstone position detecting unit 43 for detecting the position of the grindstone 40 to which the grindstone 10 is rotatably attached (movement amount α from the reference position GP), a drive motor 41 for moving the grindstone 40 forward and backward, A determination unit 72 that determines the feed speed of the grinding wheel base 40 based on the detection values of both detection units 13 and 43, and a determination unit 7
Drive motor 4 based on the feed rate determined in 2
1 and a control unit 70 for driving 1.

The outer diameter of the work 100 is detected by the work size detector 13 by the work size detector 12 and the electric micrometer 14, and the outer diameter of the work is continuously measured during the machining of the work. The work size detector 12 converts a mechanical displacement amount generated according to the outer diameter size of the work 100 into an electric signal, and outputs this electric signal to the electric micromeme 14. The electric micrometer 14 detects the outer diameter dimension of the work 100 from this electric signal, and causes the work dimension indicator 16 to display the outer diameter dimension of the work 100.

On the other hand, the position of the grindstone base 40 in the grindstone base position detecting section 43 is detected by a grindstone position detector 42 and an electric micrometer 44. The wheel head position detector 42 converts the movement amount α of the wheel head 40 from the reference position GP into an electric signal, and outputs this electric signal to the electric micrometer 44. The electric micrometer 44 detects the position of the wheel head 40 from this electric signal, and the wheel head position indicator 4
6 displays the position of the grindstone base 40.

An automatic zero adjustment circuit 48 is connected to the electric micrometer 44, and the automatic zero adjustment circuit 48 is connected.
Receives the actuation signal from the automatic zero adjustment actuation pulse generator 50 and zeroes the electric micrometer 44. still,
Details will be described later. The determination unit 72 is mainly composed of the arithmetic unit 1.
8, 20, 52, comparators 22, 24, 54, inverters 26, 28, 60, and AND gates 30, 32, 3
It is composed of 4, 56. The determination unit 72 is the whetstone base 40 detected by the whetstone head position detection unit 43.
And the AND gates 30 and 3 based on the detected value of the work size detected by the work size detection unit 13.
A signal of 1 or 0 is output from 2, 34, 56 to the control unit 70, and the feed speed of the grindstone 40 is fast-forwarded, rough-edged feed, precision-edged feed, and fixed-size (by a combination of these 1 and 0 signals). Feed stop). The feed speed is reduced in the order of fast feed, rough feed, fine feed, and sizing.

In the judging section 72, the calculator 18 is
The outer diameter dimension (2 (WD + δ)) of the workpiece 100 output from the electric micrometer 14 and the workpiece dimension (2FG) at the time of starting the polishing feed are input, and the difference (2 (W
D + δ-FG)) is output to the comparator 22. Calculator 20
Is the work 10 output from the electric micrometer 14.
The size 0 (2 (WD + δ)) and the design size (2WD) are input, and the difference (2δ) between them is output to the comparator 24.

The calculator 52 obtains the position (GP + α) of the grindstone 40 output from the electric micrometer 44 and the size of the work 100 output from the electric micrometer 14 via the half attenuator 58. Value (WD + δ)
And the set value (S) of the gap between the work 100 and the grindstone 10 when the grindstone base 40 is switched from the fast feed to the rough grinding feed, and the difference between these values ((GP + α)-(WD +
δ) −S) is output to the comparator 54.

The comparators 22, 24, 54 output a High level signal (hereinafter referred to as a signal of 1) when the input signal is positive, and a Low level signal (hereinafter referred to as a signal of 1) when the input signal is 0 or negative. 0 signal) is output. This comparator 2
The combination of 0 and 1 signals output from 2, 24, 54 changes according to the machining status of the work 100, and includes inverters 26, 28, 60, AND gates 30, 32, 3, 3.
The logic circuit composed of 4, 56 includes comparators 22, 24,
Based on the combination of 0 and 1 signals output from 54, 1 is output from any one of AND gates 30, 32, 34 and 56, and fast feed, rough lab feed, fine lab feed, fixed size (and fast feed). Return) is determined.

FIG. 2 is a table showing the feed rates with respect to the outputs of the comparators 22, 24 and 54. When a start signal for instructing the start of processing is input to the AND gate 56, the processing is thereby started.
The control unit 70 controls the AND gates 30 and 3 of the determination unit 72.
Based on the outputs from 2, 34, 56, the drive motor 41
Is controlled to control the feed rate of the grinding wheel head 40.

The details of the operation of the automatic sizing device will be described below in several stages. (1) Reference setting For reference setting, set the reference master (designed size 2WD) at the mounting position of the work, move the work size detector 12 forward, and measure the outer diameter of the reference master. The electric micrometer 14 is adjusted so that the indicator value of the indicator 16 shows zero. That is, the zero adjustment is performed so that 0 is displayed on the work size indicator 16 when measuring the size of 2WD.

Then, the grindstone base 40 is moved forward (moved to the right in the figure) to bring the grindstone surface into contact with the reference master, and the signal output from the grindstone position detector 42 at this time, that is, the grindstone. The electric micrometer 44 is adjusted so that the indication value of the table position indicator 46 becomes zero (the position of the grinding wheel base when the grinding wheel surface comes into contact with the reference master is defined as the reference position GP). This zero adjustment is performed by the wheel head position detector 4
2 position adjustment and electrical voltage adjustment. (2) Loading of work First, the grindstone 40 and the work size detector 12 are retracted,
Remove the reference master at the work mounting position. At this time,
The indication value of the wheel head position indicator 46 increases to a positive value.
The value indicated by the wheel head position indicator 46 is α. Then, the workpiece to be machined is attached to the workpiece attachment position, and the workpiece dimension detector 12 is moved forward so that the dimension of the workpiece can be measured. Measured value of the work dimension at this time, that is,
The indicated value of the work size indicator 16 indicates 2δ (where δ is a value of machining allowance (see FIG. 4)). (3) Machining of work When the start switch (not shown) is turned on, the start signal of the AND gate 56 becomes 1 and machining of the work is started. By the way, in the calculator 52, the value of (GP + α)-(WD + δ) -S is calculated, but since the electric micrometers 44 and 14 perform zero adjustment in GP and WD, respectively, GP
Since = WD = 0, the value of α-δ-S (1) is output from the calculator 52. That is, the calculator 52 calculates the distance from the current position of the grinding wheel head 40 to the position where the roughing feed is started.

Since the gap between the grindstone 10 and the work 100 is larger than S when the work 100 is newly attached, the equation (1) is larger than 0, and the comparator 54 outputs 1. Therefore, 1 is output from the AND gate 56, and the grindstone base 40 advances fast forward. The value of α gradually decreases as the wheel head 40 advances. When the grindstone base 40 moves to the start position of the rough grinding feed (the position where the gap between the grindstone 10 and the workpiece 100 becomes S) and reaches α = δ + S, the output voltage of the calculator 52 becomes 0 (of the formula (1)). Output = 0), the output signal of the comparator 54 becomes 0, the output of the AND gate 56 also becomes 0, and the fast-forward signal to the control unit 70 is stopped.

On the other hand, the inverter 60 outputs a signal of 1, and the comparators 22 and 24 still output 1 because δ> 0. Therefore, 1 is output from the AND gate 30, and the grindstone base 40 moves forward by the rough-grinding feed. When the grindstone 40 is moved forward by the rough grinding feed in this way, the following feed control is performed in the same manner as in a normal automatic sizing device.

That is, the grindstone base 40 starts the rough grinding feed position (the position where the gap between the grindstone 10 and the workpiece 100 becomes S).
When moving to, the output of comparator 54 becomes 0, and AND
The output of the gate 56 also becomes zero. On the other hand, the comparators 22 and 24
1 is output from. Therefore, 1 is output from the AND gate 30, and the grindstone base 40 moves forward by the rough-grinding feed.

When the grindstone head 40 moves forward by the rough grinding feed and the outer diameter dimension 2 (WD + δ) of the work becomes equal to or smaller than the fine grinding dimension 2FG, the outputs of the comparators 22 and 54 become 0 and the output of the comparator 24 becomes 1. The output of the AND gate 32 becomes 1. As a result, the grindstone base 40 is advanced by the precision polishing feed. Then, when the outer diameter dimension 2 (WD + δ) of the work becomes the design dimension 2WD, the outputs of the comparators 22, 24, 54 are all 0,
The output of the AND gate 34 becomes 1. As a result, the grindstone base 40 is stopped, and after sparking out for a certain period of time, it is quickly returned to the work machining start position.

As described above, when the processing of one work is completed,
This work is removed, then a new work is fixed at the work mounting position, and the work machining is repeated. (4) Automatic correction of grindstone wear When the above-described processing steps are repeatedly performed on a large number of workpieces, the size of the grindstone 10 gradually decreases due to wear or dressing. When the size of the grindstone 10 becomes smaller,
The gap between the grindstone 10 and the workpiece 100 when the grindstone base 40 is switched from the rapid feed to the rough-grinding feed becomes larger than the set value S, and the dead time of the machining process increases.

That is, since the feed rate of the grindstone base 40 is controlled based on the dimension of the grindstone 10 at the time of the reference setting regardless of the change in the dimension of the grindstone 10, the feed rate can be switched from the fast feed to the rough grinding feed. It is performed at a position where the gap between the grindstone 10 and the workpiece 100 becomes S in the size of the grindstone 10 when the reference is set. Therefore, as the size of the grindstone 10 becomes smaller, the gap between the grindstone 10 and the workpiece 100 at the time of switching from the fast-forwarding to the rough-grinding feeding becomes larger than the above S by that much.

When the gap between the grindstone 10 and the workpiece 100 increases at the time of switching from the rapid feed to the rough grinding feed, the rough grinding feed time increases until the grinding stone 10 and the work 100 come into contact with each other, and the dead time increases accordingly. , In the case of inner diameter grinding, since the grindstone size is small, the amount of wear is large and the dead time is significantly increased). 5, FIG. 6, FIG. 7 and FIG.
If the grindstone 10 is not worn after the standard setting is made in the above-mentioned machining process, and before the machining (the grindstone base 40
Is located at the backward end), the grindstone 10 and the workpiece 100
3 is a state diagram and a table showing the outer diameter dimension of the work 100 and the position of the grindstone base 40 at the time of contact and at the time of sizing respectively.

5, FIG. 6, and FIG.
6A and FIG. 7A show the state when the grindstone 10 is not worn (when the grindstone wear amount is 0), and FIG. 6 (a),
FIG. 7A shows a state where the grindstone 10 is worn (when the grindstone wear amount = −r). 5, 6, and 7
And as shown in FIG. 8, when the grindstone 10 is not worn, the outer diameter dimension of the workpiece 100 before processing is 2 (WD +
δ _m ), the wheel head position is GP + α _t , the wheel 10 and the workpiece 1
When the wheel head position at the time of contact of 00 is GP + α _c , when the wheel 10 is worn, the wheel 10 and the workpiece 100
The wheel head position at the time of contact is GP + α _c −r, and the wheel head position at the time of sizing is GP−r.

When the grindstone 10 is not worn, FIG.
As shown in (A), the position of the grindstone surface (distance from the reference position GP) and the indicated value of the grindstone position indicator 46 are equal, and when the grindstone surface advances from the workpiece 100 to the position of the gap S, rapid feed to rough grinding is performed. You can switch to sending. Further, when the machining of the workpiece is completed and the fixed size is reached, that is, when δ = 0, the indicated value of the workpiece size indicator 16 shows zero, and at the same time, the indicated value of the wheel head position indicator 46 also becomes zero. Indicates.

However, when the grindstone 10 is worn, the position of the grindstone surface is the value indicated by the grindstone position indicator 46.
9 is subtracted from the wear amount −r of 0, and as shown in FIG. 9B, the locus of the grindstone surface moves in parallel with the locus of the indicated value of the wheel head position indicator 46 by the wear amount −r. Draw the trajectory you did. Therefore, when the grindstone base 40 is switched from the rapid feed to the rough grinding feed at the position of GP + α _c + S, the grindstone surface is still at the position of GP + α _c + S + r, and the grindstone 10 and the workpiece at the time of switching the feed speed from the fast feed to the rough grinding feed. 1
The gap with 00 increases to S + r. This increase of r in the gap increases the wasted time of the roughing feed.

Further, when the grindstone 10 is worn and becomes small, the grindstone base 40 moves forward further in order to process to a fixed size, and as a result, the grindstone position indicator 4
A value of 6 will pass zero and indicate a negative value. The difference from zero indicates the amount of wear of the grinding wheel −r. Therefore, the reference position GP is moved by the amount of wear −r corresponding to the amount of wear of the grindstone 10, and the reference position is again set so that the position of the grindstone surface (distance from the reference position GP) becomes equal to the value indicated by the wheel head position indicator 46. Make settings. At this time, the reference master is not set to the work attachment position again and the reference is not set, but when the machining of the work is finished, the work is regarded as the reference master and the zero adjustment of the electric micrometer 44 is performed. .

That is, when the processing of the work is completed, this work is processed to have the same dimensions as the above-mentioned reference master, so that this can be regarded as the reference master. Then, when the processing of the work is completed, the work and the grindstone 1
0 is in full contact, and if the electric micrometer 44 is adjusted to zero at this time, the reference position GP has moved by the wear amount −r, and the position of the grindstone surface and the position of the grindstone position indicator 46 are indicated. The values are equal.

As a result, the feed speed of the grinding wheel head can be switched from the rapid feed to the rough grinding feed at the position where the gap between the grindstone 10 and the workpiece 100 becomes the set value S regardless of the change in the dimension of the grindstone 10 due to abrasion or the like. No need to waste time. The locus in FIG. 9B represents a machining process when the reference position GP is moved by the wear amount −r and zero adjustment is performed. According to this locus, the machining process is similar to that of FIG. 9A, and the dead time in the locus machining process is reduced.

The zero adjustment of the electric micrometer 44 is performed by the automatic zero adjustment operation pulse generator when a signal of 0 is output from the comparator 24 to the automatic zero adjustment operation pulse generator 50 when the workpiece becomes a certain size. 50 is performed by driving the automatic zero adjustment circuit 48 by this 0 signal. (5) Simplification of reference setting It is possible to easily perform the reference setting operation of (1) by utilizing the automatic correction of the grindstone wear amount of (4).

That is, it is not easy to bring the grindstone into contact with the reference master accurately. In particular, the reference master is a highly accurate dimensional reference, and it is not preferable that the reference master be damaged by the contact of an incorrect grindstone. Therefore, as for the reference setting, when the reference master is set to the work attachment position as in (1), the grindstone base 40 is moved forward and stopped before the grindstone surface comes into contact with the reference master. For example, a protective sheet is sandwiched between the reference master and the whetstone surface so that the whetstone surface is incompletely contacted with the reference master or is set just before contact. Then, the electric micrometer 44 is adjusted to zero.

When the work is set to the work mounting position in this state and the work machining is started, the rough-grinding feed is started earlier (that is, the machining time becomes longer) at first, but this work is started. At the end of processing, the amount of grindstone wear is automatically corrected (the gap due to incomplete contact between the reference master and the grindstone surface is judged as grindstone wear), so that the rough grinding feed can be started accurately after the second time. become. (6) Cumulative correction amount processing Except for the correction value of the electric micrometer 44 for the first time for correcting the error of the reference setting shown in (5), if the correction values for the second time and thereafter are sequentially added, this value Indicates the total amount of wear of the grindstone from the start of processing.

Therefore, by presetting the wear limit value suitable for the processing state in the control unit 70, it becomes possible to display a warning by voice, light or the like when to dress or replace the grindstone. The basic circuit configuration and operation of the automatic sizing device according to the present invention have been described above. As a result, regardless of the work size tolerance and the grindstone size, the feed speed of the grinding wheel head is always switched from the fast feed to the rough grinding feed at a predetermined distance immediately before the work surface, and the dead time is reduced.

In the above embodiment, the computer system may be used for the determination of the feed rate based on the detected work size and the position of the wheel head, the feed speed control of the wheel head, the zero adjustment of the electric micrometer, and the like. FIG. 3 shows an automatic sizing device according to the present invention (automatic sizing device for a cylindrical outer diameter grinding machine).
FIG. 1 is a configuration diagram showing an embodiment in which the above is realized by a computer system. The same parts as those in the configuration of FIG. 1 are designated by the same reference numerals.

As shown in the figure, the electric micrometer 1
The measurement value of the workpiece size output from the No. 4 and the measurement value of the position of the grindstone 40 output from the electric micrometer 44 are selectively taken into the A / D converter 112 by the analog switch 110, and the analog signal is a digital signal. And is output to the register 114. Then, the multi-bit digital signal recorded in the register 114 is output to the display 124 and the printer 126 via the interface circuit 116, the CPU 118, the data memory 120, and the register 122.

Manual data such as the operation mode and processing conditions of the apparatus is input from the key switch 128, and optional data such as the temperature correction function and the size shift function are input from the external data input unit 130. CPU118
Performs various processes while referring to the data recorded in the data memory 120 according to the program recorded in the program memory 132.

In the automatic sizing apparatus described above, the zero adjustment of the electric micrometers 14 and 44 does not zero the output of the electric micrometer itself, but the measured value at the time of the zero adjustment is stored in the data memory 120. Record and then subtract the measured value at the time of zero adjustment from the measured value output from the electric micrometer. Thereby, the same processing as the automatic sizing device shown in FIG. 1 can be performed.

In the above-mentioned embodiment, the zero adjustment of the electric micrometer 44 is performed every time when the work is finished, but the zero adjustment may be performed only when the grindstone is worn by a certain amount or more. In the above embodiment, the grinder has been described, but the present invention is not limited to this, and may be applied to other machine tools such as a lathe.

In the above embodiment, the work 100 is fixed,
The grindstone base 40 is moved and the amount of movement thereof is detected, but these are relative, and the grindstone base 40 may be fixed, and the work 100 may be moved to detect the movement amount. Both the work 100 and the grindstone 40 may be moved. In these cases, the same components as those shown in FIGS. 1 and 3 are used.

[0045]

As described above, according to the automatic sizing apparatus of the present invention, the machining tool and the workpiece are processed based on the detected values from the machining position detecting means and the dimension detecting means of the workpiece. Obtain the contact position of the object, and based on this contact position,
Since the feed speed of the processing portion is changed from high speed feed to low speed feed in front of the surface of the work piece, regardless of wear of the work tool and dimensional difference of the work piece, the work tool and the work piece are accurately The contact position can be detected, and the dead time in the processing process can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an automatic sizing device for a cylindrical outer diameter grinding machine to which the automatic sizing device according to the present invention is applied.

FIG. 2 shows a start signal and comparators 54, 22, 24.
It is a logical value table showing the feed rate for the signal output from.

FIG. 3 is a configuration diagram showing an embodiment in which an automatic sizing device (automatic sizing device for a cylindrical outer diameter grinding machine) according to the present invention is realized by a computer system.

FIG. 4 is an explanatory diagram showing a design dimension WD of a work material and a machining allowance δ.

FIG. 5 is a state diagram showing a state of a grindstone base and a work in a work processing step.

FIG. 6 is a state diagram showing a state of a grindstone base and a work in a work processing step.

FIG. 7 is a state diagram showing a state of a grindstone base and a work in a work processing step.

FIG. 8 is a table showing a grindstone base position and a work size in a work processing step.

FIG. 9 is a graph showing the position of a grindstone base and the locus of the grindstone surface in a work machining process.

[Explanation of symbols]

 10 ... Whetstone 12 ... Workpiece size detector 14 ... Electric micrometer 16 ... Workpiece size indicator 18, 20, 52 ... Arithmetic unit 22, 24, 54 ... Comparator 40 ... Whetstone stand 42 ... Whetstone stand position detector 44 ... Electricity Micrometer 46 ... Wheel head position indicator 48 ... Automatic zero adjustment circuit 50 ... Automatic zero adjustment operation pulse generator 70 ... Control unit 72 ... Judgment unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B23Q 17/22 B23Q 17/22 A B24B 49/04 B24B 49/04 A 49/10 49/10

Claims (5)

[Claims] 1. An in-process type automatic measuring device for continuously measuring a dimension of a workpiece while machining the workpiece with a machining tool of a machining section and transmitting a machining stop signal when the dimension reaches a predetermined dimension. In the dimension device, a driving unit that moves the processing unit forward and backward toward the workpiece, a processing unit position detection unit that detects a position of the processing unit moved by the driving unit, and a dimension of the workpiece. A workpiece size detecting means for continuously detecting, and a calculation for obtaining a contact position of the processing tool and the workpiece based on detection values from the processing part position detecting means and the workpiece size detecting means. Means, and a control means for controlling the driving means so that the feed speed of the processing section is changed from high speed feed to low speed feed before the surface of the workpiece based on the contact position calculated by the calculation means. Characterized by And automatic sizing device. 2. The machining portion position detecting means detects the wear amount of the machining tool from the position of the machining portion when a machining stop signal is transmitted, and the control means considers the wear amount and the machining tool. 2. The automatic sizing device according to claim 1, wherein the position at which the high speed feed is switched to the low speed feed is changed. 3. A zero point adjustment for adjusting the zero point of the machining portion position detecting means so that the position of the machining portion detected by the machining portion position detecting means becomes a zero point when the machining stop signal is transmitted. The automatic sizing device according to claim 1, further comprising means for changing a contact position of the work tool and the work piece due to wear of the work tool by adjusting a zero point. 4. The control means adds the wear amount of the machining tool every time the machining stop signal is transmitted and the zero point adjustment means performs the zero point adjustment, and when the total wear amount exceeds the limit value, the tool change, 4. The automatic sizing device according to claim 3, wherein a warning is displayed on dressing and the like. 5. The zero point adjusting means adjusts the zero point when the position of the machining tool when the machining stop signal is transmitted is displaced by a predetermined amount or more with respect to the zero point. Automatic sizing device.