JP3241453B2 - Grinding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding method for continuously grinding a cylindrical or cylindrical outer diameter portion of a workpiece and a portion where in-process measurement is impossible or difficult. .

[0002]

2. Description of the Related Art A conventional grinding method in which a valve shaft used for a rotary control valve of a power steering device of an automobile is used as a workpiece will be described with reference to FIG. Eight grooves 2 are formed in advance on the surface of the columnar portion 1a of the workpiece 1 at eight locations along the axial direction, and then the center holes 3 provided at both ends of the workpiece 1 are ground. After that, the outer diameter rough grinding is performed on the portion having the groove 2 of the cylindrical portion 1a of the workpiece 1 and the bearing assembly portion 1b by the rough grinding whetstone 4.
A portion having the groove 2 of the cylindrical portion 1a is subjected to an outer diameter finish grinding by a finish grinding grindstone 5, and a chamfering grindstone 6 is provided on both sides of the groove 2 of the cylindrical portion 1a as shown in FIG.
Chamfer grinding is performed by.

In each of the above-mentioned steps, processing is performed in the order of the above-mentioned steps using three grinding machines, a rough grinding machine, a finishing grinding machine, and a chamfering grinding machine. Since the in-process measurement is impossible in the chamfering grinding, the outer diameter dimension processed in the finishing grinding process is detected by the contact type AE sensor 7, and the thermal displacement of the grinding wheel head is determined based on the detection result. It has been corrected.

[0004]

In the above-described conventional grinding method, both the outer diameter finish grinding and the chamfering grinding of both sides of the groove are performed by separate grinding machines. Alignment failure occurs during attachment and detachment. This misalignment causes the outer diameter of the workpiece to fluctuate during chamfering by the chamfering grinder, and this wobble adds to an error due to thermal displacement, so that a large correction is required. FIG.
As shown in the figure, since the detection accuracy of the AE sensor 7 is limited due to noise such as coolant, an error occurs in the contact detection position, and when the chamfering grinding of both sides of the groove 2 occurs due to an error in the chamfer width dimension of the groove 2. There is a problem that defective products are generated.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, eliminates a misalignment of a workpiece, eliminates a dimensional error and an inaccuracy of a chamfer width on both sides of a groove, and uses a single grinding machine to remove the workpiece. It is an object of the present invention to provide a grinding method capable of performing high-precision grinding on an outer diameter portion and a portion where in-process measurement is impossible or difficult, and can reduce equipment cost.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a columnar portion and a columnar portion formed on the outer peripheral surface of the columnar portion.
Are provided at equal intervals in the circumferential direction of the part and are cylindrical
Having a plurality of grooves extending in an axial part of the portion
An object grinding method, wherein the outer peripheral surface of the cylindrical portion is roughly ground.
A first grindstone having a large diameter, a finish grinding of the outer peripheral surface,
A second grindstone having a small diameter for chamfering a groove;
A first step of roughly grinding the outer peripheral surface of the columnar portion with the first grinding wheel;
And a sizing device for the outer peripheral surface of the cylindrical portion after the rough grinding.
While using in-process measurement with
A second step of finishing grinding with
It is checked by the sizing device that the finish grinding to the diameter has been completed.
A third step of determining the position of the second grindstone when it is issued;
After the finish grinding, the chamfered portion of the groove is
A fourth step of determining a position directly opposite to the stone;
The indexed groove based on the determined position of the second grinding wheel
Fifth step for cutting the second grindstone into the chamfered portion of
And a tip .

[0007]

In the grinding method of the present invention , the first step
In-process by providing
Rough grinding on the outer peripheral surface of a cylindrical part of a work piece that can be measured
Milling and finishing grinding and in-process measurement are impossible or difficult
Difficult chamfering of grooves can be performed while the workpiece is mounted on the table of one grinder.
Unlike the case where the workpiece is attached to and detached from the table of the grinder, and each of the grindings is performed, the alignment defect of the workpiece that occurs when the workpiece is attached and detached is eliminated, and the coaxiality is improved. For this reason, when grinding in a part where in-process measurement is impossible or difficult, inaccuracy due to run-out of the workpiece during grinding is eliminated, and highly accurate processing can be performed.

In addition, a sizing device used for grinding the outer peripheral surface of the cylindrical portion of the workpiece can be used with less influence of noise, and therefore, the grinding of the outer peripheral surface of the cylindrical portion can be performed. Finished diameter after finishing can be measured accurately, and the second
By performing the correction of the wheel head of the thermal displacement of the grinding wheel precisely, the second
The position of the grindstone can be determined accurately. The chamfering of the groove portion where the in-process measurement of the workpiece is impossible or difficult is performed by using the position of the second grindstone obtained at the end of the grinding.
Since the cutting is performed based on the reference, the processing accuracy of the groove portion is improved.

Further, after the outer peripheral surface of the columnar portion of the workpiece is roughly ground with a large-diameter first grindstone efficiently , the groove portion is chamfered.
Grinding is performed using a small-diameter second grindstone that can be machined until the finish diameter is reached. Based on the position of the second grindstone at that time,
Since Lee down process measurement performs chamfering impossible or difficult groove portions by cutting, thereby enabling a high grinding both accuracy and efficiency. Also, in-process measurement
Grinding and in-process of outer peripheral surface of cylindrical part of possible workpiece
Conventionally, two grinders are used for chamfering grooves where measurement is impossible, but in the present invention only one grinder is required.
Equipment costs can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a composite grinding machine for performing a grinding method according to a first embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a bed. On the bed 11, a table 12 is provided, and a first grindstone table 13 for outer diameter rough grinding and a second grindstone table 14 for outer diameter finishing and chamfering grinding are provided. , Left and right, and the compound grinding machine has a dual head configuration.

The table 12 is configured to reciprocate in the Z-axis (left / right) direction via a feed screw shaft 16 by driving a table moving servomotor 15 provided on the bed 11. The headstock 17 and tailstock 1 are placed on the table 12.
8 are provided, between which the workpiece 1 is detachably held. The workpiece 1 is a valve shaft used for a rotary control valve of a power steering device.

[0012] the headstock 17, the spindle 20 is rotated by driving the spindle rotation servomotor 19, and the drive fitting 21 for transmitting a rotational force to the workpiece 1 is provided from the spindle 20, the servo motor for spindle rotation 19 is provided with an encoder 22 for detecting the rotation of the main shaft 20. In addition, 3
Reference numerals 3 and 34 denote centers of the spindle and tailstock.

The first and second grinding wheel heads 13 and 14 are provided with a servomotor 2 for moving the first and second grinding wheel heads provided on the bed 11.
X through the feed screw shafts 25 and 26 by the drive of
The servomotors 23 and 24 are configured to reciprocate in the axial (front-back) direction.
Encoders 23a and 24a for detecting rotations of the motors 3 and 24 are provided. In addition, the first and second grinding wheel shaft driving devices 2
First and second grinding wheel shafts 29, 30 rotated by 7, 28
The first and second grindstones 31 and 32 are detachably fitted and fixed respectively.

The first and second grindstone shafts 29 and 30 are opposed to each other and project to the left and right of the first and second grindstone stands 13 and 14, respectively. It is arranged parallel to the moving direction. The first grindstone 31 is for rough grinding, the second grindstone 32 is for finish grinding and chamfering grinding,
The second grindstone 32 has a smaller outer diameter than the first grindstone 31 and an axial length substantially equal to the length of the groove 2 of the workpiece 1.

Numeral 40 denotes a numerical controller, which is provided with a central processing unit (CPU) 41, a memory 42, and interfaces 43 and 44. On one interface 43, drive circuits 45 and 46 for controlling the position of the first and second grindstone heads, a drive circuit 47 for controlling the position of the table, and a drive circuit 48 for controlling the rotation of the spindle are provided. , 46, 47 and 48, respectively, to control the servo motors 23, 24, 15 and 19, respectively. One interface 43 is provided at an appropriate position of the encoders 22, 23a and 24a and the table 12. It is configured to input measurement values from the sizing device 49, respectively, and the other interface 44 is connected to a keyboard 50.

Next, a description will be given of a grinding method according to an embodiment of the present invention, which is performed using the grinding machine having the above-described configuration.
A groove 2 is formed in a workpiece 1 in the same manner as in the conventional example described above,
After the center holes 3 (see FIG. 2) provided at both ends are ground by using another grinding machine, the spindle-side center 33 and the tailstock center 3 are ground.
The workpiece 1 is detachably held on the table 12 by engaging and supporting the center holes 3 with the workpiece 4 respectively. Then, the first grindstone base 13 positions the first grindstone 31 behind the portion where the groove 2 of the workpiece 1 is formed, and the second grindstone base 32 is retracted.

In this state, rough grinding, finish grinding, and chamfer grinding of both sides of the groove are sequentially performed according to the flowchart shown in FIG. First, the numerical controller 40 is operated by operating the keyboard 50, the workpiece 1 is rotated around the axis by driving the spindle rotation servomotor 19, and the rough grinding is performed by driving the first grinding wheel shaft driving device 27. While rotating the first grindstone 31 around the axis, the first grindstone base 13 and the first grindstone 31 are driven by the servomotor 23 for moving the first grindstone base 13 so that the X is orthogonal to the first grindstone axis 29.
In the direction shown by the solid line in FIG.
The outer peripheral surface of the workpiece 1 has an outer diameter portion (outer peripheral portion) of a portion where the groove 2 of the cylindrical portion 1a of the workpiece 1 is formed and a bearing assembly portion 1b.
Surface) to perform rough grinding.

In the following description, the set value refers to a finish dimension value of the workpiece 1 stored in the memory 42 in advance. The measured value refers to a value of the outer diameter of the ground portion of the workpiece 1 measured by the sizing device 49. The coordinate value is a value indicating the position of the grindstone heads 13 and 14 obtained from the values of the encoders 23a and 24a that detect the rotation of the servomotors 23 and 24.

The rough grinding is performed by a signal from the central processing unit 41 up to the first set value for rough grinding stored in the memory 42 of the numerical controller 40. That is, the fact that the rough grinding has reached the first set value is detected by the first measurement value detected by the sizing device 49. Thereafter, the central processing unit 41 compares the first measured value with the first coordinate value indicating the position of the first grindstone 31 obtained from the encoder 23a to calculate a difference. In addition, the thermal displacement of the first grindstone 31 and the like is corrected, the dimensional control of the rough grinding is performed by in-process measurement, and the rough grinding process is completed.

The thermal displacement of the grindstone table 13 is corrected in the rough grinding step because the rapid advance end of the grindstone can be fixed with respect to the workpiece 1 when the next rough grinding of the workpiece 1 is performed. In addition, variations in the grinding time of the rough grinding can be reduced.

Next, the first grindstone table 13 is retracted to the position before the start of rough grinding and stopped, and the rotation of the first grindstone 31 is stopped. The table moving servomotor 15 is driven slightly behind the start of retreat of the first grindstone table 13 to move the table 12 rightward in FIG.
The grindstone 32 and the columnar portion 1a of the workpiece 1 are opposed to each other.

In this state, while the second grindstone shaft driving device 28 is driven to rotate the second grindstone 32 for finish grinding and chamfering grinding, the second grindstone head moving servomotor 24 is driven to drive the second grindstone head. 14 and the second grindstone 32 are advanced in the X direction orthogonal to the second grindstone axis 30, and the outer peripheral surface of the second grindstone 32 is formed in the groove of the cylindrical portion 1 a of the workpiece 1 as shown by the dashed line in FIG. 2. Finish grinding is performed while the table 12 is reciprocated in the Z-axis direction while being brought into contact with the outer diameter portion of the portion having 2.

The finish grinding is performed by a signal from the central processing unit 41 up to the second set value for finish grinding stored in the memory 42. That is, the fact that the finish grinding has reached the second set value is detected by the second measurement value detected by the sizing device 49. Thereafter, the central processing unit 41 compares the second measured value with the second coordinate value indicating the position of the second grindstone table 14 obtained from the encoder 24a to calculate a difference. In addition to the value, the thermal displacement of the second grinding wheel head 14 and the like is corrected, the dimensional control of the finish grinding is performed by in-process measurement, and the finish grinding process is completed.

Subsequently, a portion of the workpiece 1 where in-process measurement is impossible, specifically, both sides of the groove 2 formed in the cylindrical portion 1a of the workpiece 1 is chamfered and ground. In this chamfering grinding, the second grinding wheel table 14 is retracted in the X-axis direction, the second grinding wheel 32 is separated from the outer peripheral surface of the workpiece 1, and the table 12 is moved in the Z-axis direction. 1 groove 2
And the second grindstone 32 (see dashed line in FIG. 2, FIG. 4).
reference).

Next, the rotation of the workpiece 1 about the C axis by the spindle motor 19 and the second wheel head 14 and the second wheel 32 by the second wheel head moving servo motor 24.
By simultaneous control of CX axis by movement of X axis direction,
As shown in FIG. 4, both side portions of the groove 2 of the workpiece 1 are symmetrically performed with the second grindstone 32 with respect to the center 2 a in the width direction of the groove 2.

This chamfering grinding is performed by rotating the workpiece 1 counterclockwise and clockwise around the C axis from the reference position 2a to divide one side portion of the groove 2 into the other side portion. Alternatively, the workpiece 1 is rotated in one direction to correct the grinding error of the reference position 2a on the left and right in FIG. Chamfering.

Note that chamfering is performed on all the grooves 2 of the workpiece 1, that is, on both sides of the grooves 2 provided at eight locations in the circumferential direction of the workpiece 1. After grinding one side of the groove 2, a method of grinding the other side of all the grooves 2, after grinding one side of the groove 2,
There is a method of sequentially grinding the other side portion of the groove 2 for eight grooves 2.

After the chamfering of both sides of all the grooves 2 of the workpiece 1 is completed, the second grindstone table 14 is returned to the position before the finish grinding, and the rotation of the second grindstone 32 is stopped. At the same time, the table 12 is returned to the position before the rough grinding is performed, and the rotation of the spindle 20 is stopped. Thereafter, the holding of the workpiece 1 after the completion of the grinding by the spindle side center 33 and the tailstock side center 34 is released, the workpiece 1 is carried out of the table 12, and the unprocessed workpiece is removed. Center 3
It is detachably mounted on the table 12 by 3, 34,
Thereafter, performing the above-described grinding on the unprocessed workpiece is repeated.

As described above, in the first embodiment, after the workpiece 1 is roughly ground by the first grindstone 31 provided on one grinder, the finish grinding and the groove 2 are performed by the second grindstone 32.
Grinding on both sides of the grinding machine makes it possible to perform grinding more efficiently than conventional grinding methods, in which workpieces are sequentially replaced on three grinders. Grinding, finish grinding and chamfer grinding can be performed efficiently, and equipment costs can be reduced.

In the first embodiment, while the workpiece 1 is mounted on the table 12 of one grinding machine,
Various types of grinding can be performed, eliminating alignment defects that occur when attaching and detaching a workpiece as in the conventional example.
Since the coaxiality is improved, there is no inaccuracy due to runout of the outer diameter of the workpiece during the finish grinding and the grinding process on both sides of the groove. Is improved.

Further, based on the signal of one sizing device 49 provided on the table 12, the thermal displacement of the first and second grindstone bases 13 and 14 during rough grinding and finish grinding can be corrected by in-process measurement. Becomes easier. Further, the fact that the outer diameter of the workpiece has been ground to the predetermined finish diameter by the second grindstone 32 is accurately detected by using the sizing device 49 having little influence of noise, and detected by the sizing device 49. By comparing the measured second value and the second coordinate value indicating the position of the second grindstone head 14, the displacement caused by the heat of the second grindstone head 14 can be obtained accurately, so that the thermal displacement is corrected. The error is reduced, and the shape accuracy at the time of chamfering both sides of the groove 2 where the in-process measurement performed by the grindstone 32 of the second grindstone stand 14 is impossible is improved.

When the outer diameter portion of the workpiece 1 is roughened, the bearing assembly portion 1b is also machined, so that the coaxiality between the assembly portion 1b and the chamfered portions on both sides of the groove 2 is improved. In addition, the valve characteristics after the control valve is mounted on the workpiece 1 as the valve shaft are improved.

A grinding method according to a second embodiment of the present invention will be described with reference to FIG. In FIG. 5, reference numeral 51 denotes a workpiece formed of a cam shaft formed by axially separating a cylindrical journal portion 52 and a cam portion 53 for which in-process measurement is difficult, and the workpiece 51 has both ends. It is engaged and supported by the spindle side center 33 and the tailstock center 34, and is detachably mounted above a table not shown in FIG.

A first grindstone table 13 for rough grinding of the outer diameter of the journal part 52 and a second grindstone table 14 for both outer diameter finishing and grinding of the cam part 53 are provided side by side on the left and right sides. The compound grinding machine has a dual head configuration, and the first grinding wheel head 13
The outer diameter of the first grindstone 31 mounted on the second grindstone and the outer diameter of the second grindstone 32 mounted on the second grindstone stand 14 are substantially equal. The configuration of the composite grinding machine used in the second embodiment other than that described above is as follows.
It has almost the same configuration as the composite grinding machine used in the first embodiment.

In the grinding method according to the second embodiment, the outer diameter portion of the journal portion 52 of the workpiece 51 is roughly ground by the first grindstone 31 mounted on the first grindstone table 13, and then the rough grinding is completed. The outer diameter portion is finish-ground by the second grindstone 32 mounted on the second grindstone table 14, and thereafter, the outer peripheral surface of the cam portion 53, which is difficult to process by the in-process measurement of the workpiece 51 by the second grindstone 32. Grinding.

In the first embodiment, each of the grindings in the second embodiment is performed by chamfering both sides of the groove of the workpiece by the second grindstone 32, except that the outer peripheral surface of the cam portion 53 is ground. , And the first embodiment. In the second embodiment, a plurality of journal portions 52 formed on the workpiece 51 are provided.
Even if all of the plurality of cam portions 53 are ground after the rough grinding is performed, and then all of the plurality of cam portions 53 are ground, the rough grinding and the finish grinding are repeatedly performed on the journal portion 52 to repeat the entire grinding. The cam portion 53 may be appropriately ground following the finish grinding of an arbitrary journal portion 52 by grinding the portion 52.

A grinding method according to a third embodiment of the present invention will be described with reference to FIG. In FIG. 6, reference numeral 61 denotes a workpiece in which a large outer diameter portion 62 is formed at one end and a large outer diameter portion 62 and a small outer diameter cylindrical portion 63 are integrally formed coaxially with the large outer diameter portion 62. The large-diameter portion 62 of the object 61 is detachably held by a chuck 64 fixed to the tip of the spindle 20.

First grindstone 31 for rough grinding of outer diameter of cylindrical portion 63
The first for grinding the inner diameter of the cylindrical portion, which is difficult to process by the outer diameter finish grinding in-process measurement of the cylindrical portion 63, is difficult.
The grindstone 32 is provided on a first grindstone stand and a second grindstone stand not shown in FIG. The configuration of the composite grinding machine used in the third embodiment other than that described above is almost the same as that of the composite grinding machine used in the first embodiment.

The grinding method according to the third embodiment uses the first grinding stone 3
1, the outer diameter portion of the cylindrical portion 63 of the workpiece 61 is roughly ground, and then the outer diameter portion after the rough grinding is finish-ground by the second grindstone 32, and then the second grindstone 32 is cylindrically shaped. Part 6
3 is ground from the right side, and the second grindstone 32 grinds the inner diameter portion of the cylindrical portion 63 where in-process measurement is difficult.

Then, rough grinding according to the second and third embodiments,
In finish grinding, the difference is calculated by comparing the measured value detected by the sizing device with the coordinate value detected by the encoder that detects the rotation of the drive motor that drives the grinding wheel head, and adds this difference to the coordinate value to calculate the difference. First, the correction for the thermal displacement of the second grinding wheel head is performed separately. 5 and 6, the same reference numerals as those in FIGS. 1 and 2 indicate corresponding parts.

[0041]

As described above, the present invention provides a cylinder
Between the cylindrical part and the outer peripheral surface of the cylindrical part in the circumferential direction of the cylindrical part
And a part of the columnar part in the axial direction.
A method of grinding a workpiece having a plurality of extending grooves.
And a large-diameter first grinding wheel for roughly grinding the outer peripheral surface of the cylindrical portion.
Finishing grinding of the outer peripheral surface and chamfering of the groove.
And a second grindstone having a small diameter.
A first step of rough grinding with the first grinding wheel, and after the rough grinding
Inpurose scan measured by the sizing device the outer peripheral surface of the cylindrical portion
While the second grinding stone finish grinding to a predetermined diameter
2 steps, the outer peripheral surface is finish-ground to a predetermined diameter.
Second grinding when it is detected by the sizing device
A third step of determining the position of the stone, and after the finish grinding
Position the chamfered portion of the groove at a position directly facing the second grindstone
A fourth step of determining, and the position of the determined second grinding wheel
With respect to the chamfered part of the groove
The fifth step of cutting the second grindstone is provided , so that the following effects can be obtained.

That is, according to the grinding method of the present invention ,
By including the first to fifth steps,
Outer peripheral surface of cylindrical part of workpiece that can be measured in process
Rough grinding and chamfering are impossible or difficult groove finish grinding and in-process measurement can be performed while wearing the workpiece on one of the grinding machine table, as in the prior art for, two Unlike the case where the workpiece is attached to and detached from the table of the grinding machine, and each of the grinding operations is performed, there is no misalignment of the workpiece that occurs when the workpiece is attached or detached, and the coaxiality is improved. For this reason, when grinding a groove portion in which in-process measurement is impossible or difficult, inaccuracy due to runout of the workpiece during grinding is eliminated, and high-precision machining can be performed.

Further, a sizing device used for grinding the outer peripheral surface of the columnar portion of the workpiece can be used with less influence of noise. Therefore , the outer peripheral surface of the cylindrical portion is ground. Finished diameter after finishing can be measured accurately, and the second
By accurately correcting the thermal displacement of the grindstone head,
The position of the grindstone can be determined accurately. And in the groove part where in-process measurement of the workpiece is impossible or difficult
In the chamfering process, the position of the second grinding wheel obtained at the end of the grinding
Since the cutting is performed based on the reference, the processing accuracy of the groove portion is improved.

Further, after the outer peripheral surface of the columnar portion of the work is roughly ground with a large-diameter first grindstone efficiently , the groove portion is chamfered.
Grinding is performed using a small-diameter second grindstone that can be machined until the finish diameter is reached. Based on the position of the second grindstone at that time,
Since Lee down process measurement performs chamfering impossible or difficult groove portions by cutting, thereby enabling a high grinding both accuracy and efficiency. Also, in-process measurement
Grinding and in-process of outer peripheral surface of cylindrical part of possible workpiece
Conventionally, two grinders are used for chamfering grooves where measurement is impossible, but in the present invention only one grinder is required.
Equipment costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a composite grinding machine that performs a grinding method according to a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a relationship between a workpiece and a grindstone according to a first embodiment of the present invention in the order of steps;

FIG. 3 is a flowchart of a grinding method according to the first embodiment.

FIG. 4 is a partial cross-sectional view showing a state where both sides of a groove of a workpiece according to the first embodiment are chamfered and ground;

FIG. 5 is an explanatory diagram showing a positional relationship between a workpiece and a grindstone according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a positional relationship between a workpiece and a grindstone according to a third embodiment of the present invention.

FIG. 7 is an explanatory view showing a conventional grinding method in the order of steps.

FIG. 8 is a partial cross-sectional view showing a state where both sides of a groove of a workpiece are chamfered by a conventional grinding method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Workpiece 2 Groove 11 Bed 12 Table 14 2nd grindstone table 15 Servo motor for table movement 19 Spindle rotation motor 20 Main shaft 22 Encoder 24 2nd grindstone table movement servomotor 24a Encoder 28 Second grindstone drive device 30 Second Grinding wheel shaft 32 Second grindstone 33 Spindle side center 34 Tailstock side center 40 Numerical controller 41 Central processing unit 42 Memory 49 Sizing device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-289651 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B24B 19/00

Claims (1)

(57) [Claims] 1. A columnar portion and a columnar portion formed on an outer peripheral surface of the columnar portion.
Are provided at equal intervals in the circumferential direction of the part and are cylindrical
Having a plurality of grooves extending in an axial part of the portion
An object grinding method, comprising: a large-diameter first grindstone for rough grinding an outer peripheral surface of the cylindrical portion;
Small grinding for finishing grinding of the outer peripheral surface and chamfering of the groove
A second grindstone having a diameter, wherein the outer peripheral surface of the cylindrical portion is roughly ground with the first grindstone.
Step, the outer peripheral surface of the cylindrical portion after the rough grinding is
Finish to a specified diameter with the second whetstone while measuring the process
The second step of grinding, and that the outer peripheral surface has been finish-ground to a predetermined diameter,
Find the position of the second grinding wheel when it is detected by the sizing device
A third step, and after the finish grinding, the chamfered portion of the groove is subjected to the second grinding.
A fourth step of determining a position facing the stone, and determining the position based on the determined position of the second grinding wheel.
Cut the second grinding stone into the chamfered part of the groove
And a fifth step .