JP2001252867A - Radius measurement type sizing control method and radius measurement type sizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out sizing machining by using a radius measurement type sizing device and without stopping cut and feed. SOLUTION: In this radius measurement type sizing machining wherein a cylindrical part of a workpiece is circularly machined, the radius of a measurement portion in the single phase of the circumference of the rotating cylindrical part during the machining is measured by a measuring head. An added-up value of a measured radius value and a calculated radius value is worked out by a calculation means. The measured radius value is measured by the measuring head during the machining and the calculated radius value is measured in the phase positioned at a angle of 180 deg. circumferentially from the measurement portion. The added-up value is made to serve as a measured diameter value at the cylindrical part for the sizing machining to be carried out by a control means. The calculation means works out a tool cutting depth per half-turn of the cylindrical part by multiplying the tool cutting depth by the proportion of half-turn time of the cylindrical part to cutting time on the basis of the tool cutting depth, the cutting time, and the half-turn time of the cylindrical part in a fixed working process section set as a parameter in advance. Additionally, the calculation means works out the calculated radius value by adding the measured value to the tool cutting depth per half-turn of the cylindrical part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radius measurement type sizing process in which a radius of a workpiece is measured and a sizing control is performed in a grinding process or a turning process.

[0002]

2. Description of the Related Art In the prior art, a measuring head of a sizing device in a grinding process or a turning process includes a method of detecting the diameter of a workpiece by a gauge that sandwiches the outer peripheral surface of the workpiece from a diametric direction and a method of detecting the diameter of the workpiece. V block and V that can contact the outer peripheral surface
There is a type (see FIG. 5) of detecting a radius at one circumferential point on the outer peripheral surface of a workpiece, comprising a probe which is urged in a protruding direction from the center of the block and protrudes freely.

[0003]

A measuring head of the type in which the diameter of the workpiece is detected by a gauge that sandwiches the outer peripheral surface of the workpiece from the diametrical direction directly detects the diameter of the workpiece, so that the measurement value has a problem. However, it is unsuitable for measuring a processing location that is in planetary motion with respect to the center of rotation of the workpiece, such as a crankpin of a crankshaft.

A measuring head of a type for detecting a radius at one point on the outer peripheral surface of a workpiece is a V block,
It is suitable for on-machine measurement of a processing part that performs this type of planetary motion. However, during the cutting feed, the radius of the rotating workpiece changes according to the circumferential phase with respect to the machining point in contact with the tool, as shown in FIG. Therefore, the measurement value of detection at a single point by the V block does not become an accurate measurement value.

Therefore, as shown in FIG. 5, the cutting feed is intermittently performed, and the workpiece is rotated a suitable number of times (N times) every time the cutting feed is temporarily stopped, so that the machining with the tool is continued. Then, a value obtained by doubling the radius measurement value obtained by detection of the measuring head after that is set as the diameter measurement value (Dn) as the target value (D
Sizing control must be performed in comparison with f).

[0006] The measurement after the cutting feed is intermittently performed and the workpiece is rotated several times as appropriate each time the cutting feed is temporarily stopped increases the processing time and decreases the processing efficiency. The present invention provides a radius measurement type sizing process that can perform sizing without stopping cutting feed, that is, without lowering the processing efficiency, while using the radius measurement type sizing device.

[0007]

SUMMARY OF THE INVENTION A radius measuring type sizing apparatus according to the present invention is a measuring apparatus for processing a cylindrical portion of a workpiece into a circular shape. A measuring head for measuring a radius of the rotating cylinder, a calculating means for calculating a sum value of a radius value of a phase which is π radian (180 degrees) apart from the measuring point in a circumferential direction, and a rotating cylinder portion being processed with the sum value. Control means for controlling the size as a measured diameter value.

[0008] As means for obtaining a radius value of a phase π radian (180 degrees) in the circumferential direction from the measurement point, a memory means for storing an actually measured radius value measured by a measuring head is provided. Means for treating the stored measured radius value before half rotation as a radius value of a phase π radians (180 degrees) in the circumferential direction away from the measurement point, or one of the rotating cylindrical parts being machined to the measured radius value. Means for calculating by adding the tool cutting amount per / 2 rotation, for example, the tool cutting amount and cutting time for a certain machining process section set in advance as a parameter, and 1 of the rotating cylindrical portion being machined.
Multiplying the ratio of the occupation of the 1/2 rotation time of the rotating cylindrical portion during machining to the cutting time on the basis of the 1/2 rotation time by the amount of tool cut-in, the tool per 1/2 rotation of the rotating cylindrical portion during machining. There is a means for calculating a cutting amount and adding the tool cutting amount to an actually measured radius value.

A radius measuring type sizing control method according to the present invention is directed to a radius measuring type sizing apparatus, in which a cylindrical portion of a workpiece is machined into a circular shape using a radius measuring type sizing device. The radius of the measurement point of the circumferential single phase is measured, and the measured actual radius value and π radian (1
(80 degrees) apart from each other and the sum of the values is controlled as the measured diameter value of the rotating cylindrical portion being processed.

As a method of obtaining a radius value of a phase which is π radians (180 degrees) in a circumferential direction from the above-mentioned measurement point, for example, an actually measured radius value during machining is stored in a memory means, and the memory means stores the measured radius value in the memory means. Using the stored actual radius value before half a rotation, π radians (18
0 degree) is treated as a radius value of a phase separated, or is calculated by adding a tool cutting amount per 1/2 rotation of the rotating cylindrical portion being processed to an actually measured radius value.

[0011] Then, 1/1 of the rotating cylindrical portion during the above-mentioned processing.
As an example of the method of obtaining the tool cutting amount per two rotations,
The amount of cutting of the tool, the cutting time, and the 1/2 rotation time of the rotating cylinder during machining for a certain machining process section are set as parameters in advance, and the 1/2 rotation of the rotating cylinder during machining with respect to the cutting time is set. It is calculated by multiplying the ratio of time occupied by the amount of tool cutting.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A crank grinding machine provided with a radius measuring type sizing device according to an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a grinding wheel base 2 slidably provided in a cutting direction in a bed 1 is moved in an X-axis direction by a feed screw mechanism 4 driven by a feed servo motor 3, and the feed servo motor Numeral 3 is controlled and driven by a numerical controller 20 described later.

A crankshaft W, which is a workpiece, is held by a center of a tailstock and a work spindle which is rotationally driven by a work headstock, and a Z-axis perpendicular to the X-axis direction (perpendicular to the plane of FIG. 1). The crankpin P of the crankshaft W is driven to rotate around and revolves around the axis of the journal.

The grindstone stand 2 is provided with a grindstone shaft (not shown) protruding in the Z-axis direction so as to be rotationally driven by a grindstone motor (not shown). At the tip of the grinding wheel shaft, a grinding wheel 5, for example, having a thickness of 5 to 10
A grinding wheel having a super-abrasive layer bonded to diamond, preferably CBN abrasive grains, for example, by vitrified bond, is mounted on the order of mm. Then, the grindstone surface of the outer peripheral surface is opposed to the crankpin P of the crankshaft W.

A sizing device A is mounted on the grinding wheel base 2. A base of a first arm 8 is attached to a top of a support member 6 erected on the grindstone base 2 via a support shaft 7 rotatable in the Z-axis direction. The base of the second arm 10 is mounted via a support shaft 9 that can rotate in any direction.

The second arm 10 is shown in FIG.
Is rotatable clockwise, but is rotatable counterclockwise only until it contacts a stopper 19 provided at the tip of the first arm 8. Second arm 10 and Z
At the distal end of the measuring rod 11 whose base is perpendicular to the axis and whose base is attached to the distal end of the second arm 10, a V-block 12 that can come into contact with the outer peripheral surface of the crankpin P of the crankshaft and protrudes from the center of the V-block 12. A measuring head H comprising a probe 13 which is urged in the direction and protrudes forward and backward is attached.

The tip of the probe 13 comes into contact with the crankpin P in contact with the V-shaped surface of the V-block 12, and outputs the advance / retreat as an electric signal to a numerical controller 20 described later. The V-block 12 is provided with a guide member 14 extending downward to guide the V-block 12 moving toward the crankpin P so as to contact the crankpin P.

At the base of the first arm 8, an operating member 15 having a stepped swinging arm 15 a on the base side and a contact piece 15 b on the tip side is formed substantially perpendicular to the first arm 8. It is attached integrally. A hydraulic cylinder 16 is provided horizontally on the grindstone base 2, and the tip of the piston rod 16 a protruding rearward can contact the contact piece 15 b of the operating member 15.

Therefore, in FIG. 1, the piston rod 16a
When the first arm 8 is extended,
Is rotated clockwise about the support shaft 7 and the piston rod 1
When 6a retracts, the first arm 8 rotates counterclockwise around the support shaft 7 due to the weight of the second arm 10 and the measuring head H.

The numerical control unit 20 includes a CPU 21, a ROM
22, and a RAM 23 are mutually connected via a bus 24. The CPU 21 includes an interface 25
Are connected so as to input a drive command to the X-axis servo motor control circuit 17 via the. The X-axis servo motor control circuit 17 drives the corresponding servo motor 3 and is connected to the servo motor 3 so that a feedback signal is input from the encoder 3a of the servo motor 3.

An input / output device 30 including a CRT 31 and a numeric keypad 32 is connected to the bus 24 via an interface 26. The ROM 22 stores a system control program and the like, and the RAM 23 stores a machining control program and the like. Further, the numerical controller 20
In addition, the measuring head H of the sizing device A provided on the grinding wheel head 2 is connected to the bus 24 via an interface 18 including an AD converter. The CPU 21 is provided with a calculating means for accurately calculating the diameter of the crankpin P during grinding, which will be described later, based on the radius measurement signal input from the measuring head H of the sizing device A.

The sizing of a crank pin of a crankshaft by a crank grinder equipped with a radius measuring sizing device according to an embodiment of the present invention will be described. First, both ends of a crankshaft W, which is a workpiece, are held at the center of the work headstock and the center of the tailstock, and the fixed-size grinding portion is a crankpin P.

In the numerical controller 20, a predetermined fixed-size grinding program is input in advance from the input / output device 30, and the following steps are performed according to the program. The grinding wheel 5 of the grinding wheel head 1 is rotationally driven by the motor of the grinding wheel head 1, the table on which the center of the work headstock and the tailstock are mounted is moved in the Z-axis direction, and the crankpin P to be ground is ground. It is positioned at a position facing the grinding wheel 5 of the table 1.

When the work spindle is rotationally driven, the crankshaft W is rotated around the journal axis, and the crankpin P revolves around the journal axis.
The feed servomotor 3 is driven by the X-axis servomotor control circuit 17 based on a command from the numerical controller 20. As a result, the grinding wheel head 2 moves forward and backward through the feed screw mechanism 4. You do it.

In this case, a command synchronized with the drive of the machine spindle servomotor based on the command from the numerical controller 20 is added to the drive of the feed servomotor 3, and the crankpin P revolves for the feed of the grinding wheel head 1. Forward / backward movement is added. As described above, in the synchronized state between the rotation of the spindle and the advance / retreat of the grinding wheel head, first, the grinding wheel head 2 is rapidly fed from the standby position and approaches the opposing crankpin P.

Then, rough grinding feed is performed. After the grinding wheel 5 comes into contact with the crankpin P, the crankpin P is roughly ground by the grinding wheel 5. As will be described later, according to the operation of the sizing device, the cutting feed of the grindstone table 2 by the feed servomotor 3 is switched to the fine grinding feed based on a command from the numerical controller 20, and the grinding wheel 5
Is finely ground.

Then, in accordance with the operation of the sizing device, the cutting feed of the grinding wheel base 2 by the feed servomotor 3 is switched to the fine grinding feed based on a command from the numerical controller 20, and the crank pin P is moved by the grinding wheel 5. Fine grinding. When the crank pin P has a predetermined finishing dimension, the cutting feed of the grinding wheel head 2 by the feed servomotor 3 is temporarily stopped based on a command from the numerical controller 20 according to the operation of the sizing device, and spark out is performed. . Thereafter, the feed servomotor 3 is controlled based on a command from the numerical controller 20.
As a result, the grinding wheel head 2 is quickly returned to the standby position, the rotational drive of the work spindle and the movement of the grinding wheel head 2 in synchronism therewith are stopped, and the grinding process is completed.

In the above-mentioned grinding, the operation of the sizing device will be described. When the rough grinding proceeds somewhat and a ground surface appears,
Hydraulic cylinder 1 based on a command from numerical controller 20
6. The piston rod 16a is retracted from the standby position where the piston rod 16a protrudes.

Then, the operating member 15, the first arm 8 and the second arm 10 of the sizing device A at the standby position due to the weight of the measuring head H and the like of the sizing device A move around the support shaft 7 in FIG. It rotates counterclockwise to a predetermined position. In the meantime, the guide member 14 comes close to the crankpin P while contacting the crankpin P from above, and the V-block 12 and the probe 13 that come close to the crankpin P integrally with the guide member 14 until the probe contacts the crankpin P. invite.

Since the V-block 12 and the probe 13 are brought into contact with the crankpin P before reaching the final rotation position of the first arm 8, the rotation of the second arm 10 is prevented, and the final movement of the first arm 8 is stopped. By rotation, it is separated from the stopper 19 by an appropriate distance. As a result, the V block 12 and the probe 13 come into contact with the outer peripheral surface of the crankpin P from above due to the weight pressure. At this time, the probe 13 that contacts the crankpin P before the V block 12 is
It is pushed into 2 and retreats.

Then, as the cutting feed of the grinding wheel 5 proceeds and the diameter of the crank pin P to be ground decreases, the probe 13 retreats into the V block 12. That is, a position signal of the probe 13 that is displaced by coming into contact with the outer peripheral surface of the crankpin P is input to the numerical controller 20 via the interface 18 during the grinding.

The two bearing surfaces of the V-block 12 which are in contact with the outer peripheral surface of the crankpin P and are opened at a predetermined angle and the crankpin P
It is well known geometrically that the radius of a cylindrical body (cross-sectional circle) such as the crankpin P is measured in relation to the position of the tip of the probe 13.

As shown in FIG. 3, since the rotation of the crank pin P and the cutting feed of the grinding wheel 5 are continuously performed in synchronization with each other, the radius of the crank pin P is determined by the outer peripheral surface of the grinding wheel 5. Immediately after the contact, i.e., the outer peripheral surface portion immediately after the grinding is minimized, gradually increases in the rotational direction of the crankpin P, and immediately before the contact with the outer peripheral surface of the grinding wheel 5, that is, the outer peripheral surface portion immediately before the grinding is maximized. .

The measuring head H is located above the crankpin P during the grinding process, and always measures the radius of the peripheral surface portion which has reached the measuring position (phase position approximately 1/4 turn after the grinding position). Measuring. In other words, the radius of the peripheral surface that has been ground by the grinding wheel 5 at the cutting feed position at a time point about 1/4 rotation before the measurement is measured. In FIG. 3, the measurement position of the probe 13 is assumed to be a position advanced by 1/4 rotation from the grinding position in FIG. 3 for convenience. Degree) advanced position.

Therefore, the (radius) measured value measured by the measuring head H is smaller than 1/2 of the actual diameter value D of the crankpin P, and the measured value of the measuring head H is one of the diameter value of the crankpin P. / 2, and when the fixed-size grinding is performed, the actual crankpin P is largely finished.

Therefore, the measured value D of the diameter of the crankpin P, which is assumed to be measured based on the (radius) measured value measured by the measuring head H, is obtained by performing a correction calculation according to the following equation. (See FIG. 3) D = R + {(T / t) × a + R} = 2R + (T / t) × a D: Measured value of crankpin P diameter (μm) T: Required half rotation of crankpin P Time (ms) t: Cutting time of each grinding step of grinding wheel 5 (ms) a: Cut amount of grinding wheel 5 at cutting time t (μm) R: Measurement value by measuring head H (μm)

As described above, the position signal of the probe 13 of the measuring head H, that is, the measured value (R) signal during the grinding process, which is input to the numerical controller 20 via the interface 18 and input to the numerical controller 20 and stored. Numerical control device 2 based on various set values according to the grinding conditions
At 0, the calculation by the above equation is performed.

[0038]

The calculation result is used as a diameter measurement value D of the crankpin P and controlled by the numerical controller 20 in accordance with the grinding program in a measurement process as shown in FIG.
The measurement processing is performed by 21.

1. The measurement cycle starts. 2. The coarse grinding step (F) stored in the numerical controller 20
= 1) Command is set. 3. The measurement signal of the measurement head is input to the numerical controller 20, and the measurement signal is read (R1).

4. It is determined whether the grinding is rough grinding (F = 1). 5. When determining that the grinding being performed is coarse grinding (F = 1), the CPU 21 sets various rough grinding setting values (a1, t1, T1, Df + S1) stored in the RAM.

6. D1 = R1 × 2 + (T1 / t1) × a
1 is performed, and D1 is calculated. 7. D1 and Df + S1 are compared, and the above-described steps 3 to 7 are repeated until D1 reduced by rough grinding reaches Df + S1.

8. When D1 reduced by the coarse grinding reaches Df + S1, the CPU 21 sets F = 2,
A fine grinding command is output, the feed servomotor 3 is driven at the fine grinding feed speed, and the feed of the grinding wheel head 2 is set as the fine grinding feed, and the process returns to step 3. 9. When the measurement signal reading (R2) of the measuring head is performed in the step 3, and it is determined in the step 4 that the grinding is not the rough grinding (F = 1), it is determined whether the grinding is the fine grinding (F = 2). Be done

10. When the CPU 21 determines that the grinding being performed is the fine grinding (F = 2), the various setting values (a2, t2, T2, Df +) for the fine grinding stored in the RAM 23 are stored.
Set S2). 11 (6). The calculation of D2 = R2 × 2 + (T2 / t2) × a2 is performed, and D2 is calculated.

12 (7). D2 and Df + S2 are compared, and until D2, which decreases in fine grinding, reaches Df + S2,
Steps 3, 4, 10, 6 and 7 are repeated. 13. When D2 reduced by fine grinding reaches Df + S2,
The CPU 21 sets F = 3, outputs a fine grinding command, drives the feed servo motor 3 at the fine grinding feed speed, and returns to the above-mentioned step 3 with the feed of the grindstone table 2 as the fine grinding feed.

14 (9). The measurement signal reading (R3) of the measuring head is performed in the step 3, and the grinding is performed in the rough grinding (F) in the step 4.
= 1) If not, it is determined whether or not the grinding is fine grinding (F = 2). The CPU 21 determines that the grinding being performed is fine grinding (F = 2).
If it is determined that they are not, the various setting values (a3, t3, T3, Df) for fine grinding stored in the RAM 23 are set.

16 (6). D3 = R3 × 2 + (T3 / t
3) The calculation of × a3 is performed, and D3 is calculated. 17 (7). D3 is compared with Df, and the above-mentioned steps 3, 4, 15, 6, and 7 are repeated until D3, which is reduced by fine grinding, reaches Df.

18. When D3, which is reduced by the fine grinding, reaches Df, the CPU 21 executes the wheel wheel retreat after spark out. As a result, the feed servomotor 3 is stopped based on the command, spark-out starts, the hydraulic cylinder 16 operates, and the piston rod 16a extends from the measurement position in the retracted state (shown by the solid line in FIG. 1). . Then, the operation member 15 of the sizing device A at the measurement position, the first
The arm 8 and the second arm 10 rotate clockwise around the support shaft 7 in FIG. 1 to a predetermined position, and the measuring head H of the sizing device A returns to the standby position.

After a predetermined spark-out time has elapsed based on a command signal from the numerical controller 20, the feed servomotor 3 is driven by the output from the drive circuit 17, and the grinding wheel head 2 is moved via the ball screw mechanism 4. At the rapid return speed to the standby position and stop, and the spindle servomotor is stopped. 19. Thus, the grinding process ends.

In the above-described embodiment, the radius value of the phase π radians (180 degrees) in the circumferential direction from the measurement point, that is, (Rn + Δdn) in FIG. 3 is calculated. It does not matter. Specifically, each measurement phase (for example, π / 18
(0 radians or π / 360 radians), the measured radius dimension is updated and stored in a predetermined storage area of the RAM 23, and at the same time, the phase of the angle phase having a phase difference of π radian from the angle phase from which each measured radius dimension is extracted is set. The measured radius dimension may be read from the RAM 23, and the read measured radius dimension detected before the half rotation may be used.

Although the sizing device according to the above embodiment is applied to a crankpin grinding machine, the present invention is not limited to a crankpin grinding machine, but may be applied to a plurality of axially existing plural workpieces on the same workpiece. The present invention can also be applied to a grinder which needs to grind the processed portion, for example, a general multi-stage cylindrical grinder or a crank grinder journal grinder.

Further, in the above embodiment, the CPU 21 of the numerical controller 20 for controlling the grinding machine executes the measurement cycle routine shown in FIG. 4, but this is executed by a computer other than the computer having the CPU 21. A routine may be executed.

[0053]

In the radius measuring type sizing apparatus according to the present invention, the cutting operation is performed during the cutting feed in the radius measuring type sizing apparatus using a measuring head for detecting the radius at one point on the outer circumferential surface of the workpiece. To eliminate inaccuracies in diameter measurements due to the fact that the radius of the rotating workpiece changes due to the circumferential phase with respect to the machining point that comes into contact with the tool, the cutting feed is intermittent, and every time the cutting feed is suspended. The sizing process can be performed continuously without the necessity of continuing the machining with the tool by rotating the workpiece several times as appropriate. Therefore, the processing time does not become long and the processing efficiency does not decrease.

Further, in the radius measuring type sizing apparatus according to the present invention, there is provided a diameter measuring type sizing apparatus using a measuring head of a type for detecting the diameter of a workpiece by a gauge sandwiching the outer peripheral surface of the workpiece from the diametric direction. Differently, for example, measuring points such as crankpins of crankshafts are suitable for use in machining with planetary motion.

[Brief description of the drawings]

FIG. 1 is a side view of a radius measuring type sizing device for a crank grinding machine according to an embodiment of the present invention.

FIG. 2 is a block diagram of a numerical control device of the crank grinding machine provided with the radius measuring type sizing device in the embodiment of the present invention.

FIG. 3 is an explanatory diagram of a diameter measurement value calculation of the radius measurement type sizing device in the embodiment of the present invention.

FIG. 4 is a flowchart executed by the CPU of the numerical controller for radius measurement type sizing control in the embodiment of the present invention.

FIG. 5 is an explanatory diagram of sizing control of a radius measuring type sizing device according to a conventional technique.

[Explanation of symbols]

 Reference Signs List 1 bed 2 wheel head 3 feed servo motor 4 feed screw mechanism 5 grinding wheel A sizing device 6 support member 7, 9 support shaft 8 first arm 10 second arm 11 measuring rod H measuring head 12 V block 13 probe 14 guide member DESCRIPTION OF SYMBOLS 15 Operating member 15a Oscillating arm 15b Contact piece 16 Hydraulic cylinder 16a Piston rod 20 Numerical control device 21 CPU 22 ROM 23 RAM 24 Bus 25, 26, 18 Interface 17 X-axis servo motor control circuit 30 Input / output device 31 CRT 32 Numeric keypad W Crankshaft P Crankpin

Continuation of the front page F term (reference) 3C001 KB07 SB04 TA05 TB03 3C029 BB03 3C034 AA01 BB91 CA02 CB03 DD01 3C043 AC21 CC03 DD06 3C045 HA07

Claims (8)

[Claims] In a sizing process for processing a cylindrical portion of a workpiece into a circular shape, a radius of a measuring point of a circumferential single phase of a rotating cylindrical portion being processed is measured, and the measured radius value and the measured radius value are measured. A sizing control method in which a radius value of a phase separated by π radians (180 degrees) in a circumferential direction from a point is added, and the sum value is controlled as a measured diameter value of the rotating cylindrical portion being processed. The measured radius value before half a rotation is stored in a memory means, and π radians (1
The radius value of the phase that is separated by 80 degrees) is the actually measured radius value before half a rotation stored in the memory means.
Sizing control method. 3. A π radian (1) in a circumferential direction from a measurement point.
2. The sizing control method according to claim 1, wherein the radius value of the phase separated by 80 degrees is calculated by adding a tool cutting amount per 1/2 rotation of the rotating cylindrical portion being processed to the actually measured radius value. 4. The tool cutting amount per 1/2 rotation of the rotating cylindrical portion during machining is defined as a tool cutting amount and a cutting time for a constant machining process section, and a half rotation of the rotating cylindrical portion during machining. 4. The sizing control method according to claim 3, wherein the time is set in advance as a parameter, and the time is calculated by multiplying a ratio of a half rotation time of the rotating cylindrical portion being machined to the cutting time by a tool cutting amount. 5. A measuring head for measuring a radius of a measuring point of a circumferential single phase of a rotating cylindrical portion during processing in a sizing processing device for processing a cylindrical portion of a workpiece into a circular shape, and measuring with a measuring head during processing. Calculating means for calculating the sum of the actually measured radius value and the radius value having a phase π radian (180 degrees) in the circumferential direction away from the measurement point, and the measured diameter value of the rotating cylindrical portion being machined using the sum value And a control means for performing sizing control. 6. A memory means for storing a measured radius value before a half rotation, wherein the measured radius value before the half rotation stored in said memory means is π radians (180 radians) in a circumferential direction from a measurement point.
6. The radius-type sizing device according to claim 5, wherein the radius-type sizing device is treated as a radius value of a phase apart. 7. A π radian (1) in a circumferential direction from a measurement point.
The radius type sizing device according to claim 5, wherein the radius value of the phase separated by 80 degrees is calculated by adding a tool cutting amount per 1/2 rotation of the rotating cylindrical portion being processed to the actually measured radius value. . 8. The amount of tool cutting per one-half rotation of the rotating cylindrical part during machining includes the amount of tool cutting and the cutting time for a certain machining process section, and one-half rotation of the rotating cylindrical part during machining. 8. The radius type sizing according to claim 7, wherein the time is set in advance as a parameter, and the ratio of the 1/2 rotation time of the rotating cylindrical portion being machined to the cutting time is multiplied by the tool cutting amount. apparatus.