JP3239651B2 - Honing device and honing 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 method for rotating a honing head provided with a plurality of grinding wheels at appropriate intervals in a circumferential direction and reciprocating in an axial direction while synchronizing a plurality of grinding wheels on the outer side of the honing head. The present invention relates to a honing apparatus and a honing method for performing honing processing by moving an inner surface of a bore in a workpiece such as a cylinder block by moving in a radial direction.

[0002]

2. Description of the Related Art A general honing apparatus will be briefly described.

[0003] A work fixing device for supporting and fixing a workpiece having a bore is provided below the main body frame in the honing apparatus. A honing head is provided above the main body frame and above the work fixing device so as to be rotatable and reciprocally movable in the axial direction (the depth direction of the bore). In order to rotate the honing head, a head rotation motor is provided at an appropriate position on the main body frame.

The honing head includes a plurality of grindstones movable in a radial direction (radial direction of the honing head) at appropriate intervals in a circumferential direction. It moves in the direction.
The grindstone operating device includes an operating rod having a tapered cone as shown in Japanese Utility Model Application Laid-Open No. 3-11554, an operating cylinder for moving the operating rod in the axial direction, and the like.

[0005] The honing device is provided with an air measuring device for measuring the bore diameter during honing. The air measuring device includes an air nozzle provided on a head body of a honing head for injecting air,
A converter is provided for converting the pressure fluctuation of the air into a measurement signal corresponding to the processing diameter of the bore. Then, when the measurement signal corresponding to the predetermined processing diameter is converted by the converter, the working cylinder in the grinding wheel operating device is controlled so that the plurality of grinding wheels are moved in the outer radial direction by the operation of the control device and stopped. Is what you do.

Therefore, a workpiece having a bore is supported and fixed by the work fixing device. Next, the honing head is moved in the axial direction and inserted into the bore of the workpiece. Then, while rotating the honing head by driving the motor for rotating the head and reciprocating the honing head in the axial direction, a plurality of grindstones are synchronously moved in the outer radial direction by driving the working cylinder in the grindstone operating device. By pressing against the inner surface of the bore, the inner surface of the bore of the workpiece is ground to perform honing. Here, the honing process includes a roughing process in which the roughing is performed at a high speed of the honing head and a semi-finishing process in which the rotating speed of the honing head is a medium speed after performing the roughing. And a finishing step of performing finishing while the rotation speed of the honing head is low after performing the semi-finishing.

Before shifting to the finishing step, air is injected from the air nozzle to the inner surface of the bore, and the pressure fluctuation of the air is converted by a converter into a measurement signal corresponding to the processing diameter of the bore. Measure the processing diameter. Then, after the transition to the finishing processing, when the measurement signal corresponding to the predetermined processing diameter is converted by the converter, the control device appropriately controls the working cylinder to move the plurality of grinding wheels in the outer radial direction. Let me stop.

[0008]

The relationship between the output of the measurement signal converted by the converter and the rotation speed of the honing head has a relationship as shown in FIG. That is, when the rotation speed of the honing head is high, the amplitude of the measurement signal is small and the sensitivity of the measurement signal is inferior to that when the rotation speed is low.

Therefore, the measurement accuracy of the bore diameter in the semi-finishing process is significantly inferior to the measurement accuracy of the bore machining in the finishing process, and the grinding amount in the semi-finishing process is considerably larger than a predetermined grinding allowance. There are quite a few things that happen. Therefore, if the grinding amount in semi-finishing is considerably larger than the predetermined grinding allowance,
There is a problem that the grinding allowance in the finishing processing is small and sufficient finishing processing cannot be performed, and the accuracy of the honing processing on the inner surface of the bore deteriorates. Further, when the grinding amount in the semi-finishing process is considerably smaller than a predetermined grinding allowance, there is a problem that the grinding allowance in the finishing process is increased, the finishing process requires a lot of time, and the working efficiency is deteriorated.

In the semi-finishing process or the finishing process, the rotation speed of the honing head is not always constant, and the rotation speed of the honing head may be changed due to clogging of the grindstone, change of the grindstone, or the like. Therefore, when the rotation speed of the honing head changes, the amplitude of the output of the measurement signal changes, so that stable measurement cannot be performed, and there is a problem that the honing processing accuracy is deteriorated.

[0011]

Means for Solving the Problems In order to solve the conventional problems as described above, in the present invention, as a first means, a work fixing device for supporting and fixing a workpiece having a bore is provided. A honing head is provided at a position facing the work fixing device so as to be rotatable and reciprocable in the axial direction, and a plurality of grindstones movable in the radial direction (radial direction of the honing head) are provided in the honing head at appropriate intervals in the circumferential direction. The honing head is further provided with an air nozzle for injecting air against the inner surface of the bore, and the pressure fluctuation or flow rate of the air is provided. A converter for converting the fluctuation into a measurement signal corresponding to the bore diameter is provided, and when the rotation speed of the honing head changes, this measurement signal is transmitted to the honing head. Characterized by comprising providing an amplifier for amplifying in response to rotation speed.

As a second means, a work fixing device for supporting and fixing a workpiece having a bore is provided, and a honing head is provided at a position facing the work fixing device so as to be rotatable and reciprocally movable in the axial direction. The honing head is provided with a plurality of radially movable grindstones at appropriate intervals in the circumferential direction, and provided with a grindstone actuating device that synchronously moves the plurality of grindstones to the outer radial direction. An air nozzle for injecting air to the bore inner surface of the bore is provided, and a converter for converting a pressure fluctuation or a flow rate fluctuation of the air into a measurement signal corresponding to a processing diameter of the bore is provided, and a rotation speed of the honing head changes. An amplifier for amplifying the measurement signal in a stepwise manner corresponding to the rotation speed of the honing head is provided.

As a third means, in addition to the constituent elements of the first or second means, when a measurement signal corresponding to a predetermined processing diameter is amplified by the amplifier, a plurality of grinding wheels move in the outer radial direction. And a control device for controlling the grinding wheel operating device so as to stop the operation.

As a fourth means, a plurality of grinding wheels are synchronously moved in the outer radial direction while a honing head provided with a plurality of grinding wheels at appropriate intervals in the circumferential direction is rotated and reciprocated in the axial direction. By doing so, in the honing method for performing honing by grinding the inner surface of the bore of the bore in the workpiece, the pressure fluctuation or flow rate fluctuation of the air injected from the air nozzle provided in the honing head to the inner surface of the bore, A step of converting the measurement signal into a measurement signal corresponding to the bore diameter; and amplifying the measurement signal in accordance with the rotation speed when the rotation speed of the honing head changes.

As a fifth means, a plurality of grinding wheels are synchronously moved in the outer radial direction while a honing head provided with a plurality of grinding wheels at appropriate intervals in the circumferential direction is rotated and reciprocated in the axial direction. Thus, in the honing method of performing honing by grinding the inner surface of the bore of the bore in the workpiece, the pressure variation or flow rate variation of the air injected from the air nozzle provided in the honing head to the inner surface of the bore is reduced. A step of converting the measurement signal into a measurement signal corresponding to a processing diameter, wherein when the rotation speed of the honing head changes, the measurement signal is amplified stepwise in accordance with the rotation speed.

As a sixth means, a plurality of grinding wheels are synchronously moved in the outer radial direction while a honing head provided with a plurality of grinding wheels at appropriate intervals in the circumferential direction is rotated and reciprocated in the axial direction. In the honing method, in which the inner surface of the bore in the workpiece is ground and the honing is performed, a roughing process is performed in which the rotation speed of the honing head is high and a honing process is performed after the roughing is performed. A medium finishing step in which the rotational speed of the head performs medium finishing under a medium speed state, and a finishing step in which the rotational speed of the honing head performs finishing under a low speed state after performing the medium finishing processing, After or before the transition to the semi-finishing process, pressure fluctuations or flow fluctuations of the air injected from the air nozzles provided in the honing head to the inner surface of the bore , Into a measurement signal corresponding to the machining diameter of the bore, before the transition from the semi-finishing step finishing process, characterized by comprising amplified the measurement signal corresponding to the rotational speed of the honing head.

As a seventh means, the honing head provided with a plurality of whetstones at appropriate intervals in the circumferential direction is rotated and reciprocated in the axial direction, while simultaneously moving the plurality of whetstones in the outer radial direction. In the honing method, in which the inner surface of the bore in the workpiece is ground and the honing is performed, a roughing process is performed in which the rotation speed of the honing head is high and a honing process is performed after the roughing is performed. A medium finishing step in which the rotational speed of the head performs medium finishing under a medium speed state, and a finishing step in which the rotational speed of the honing head performs finishing under a low speed state after performing the medium finishing processing, After or before the transition to the semi-finishing process, the pressure fluctuation or flow rate fluctuation of the air injected from the air nozzle provided in the honing head to the inner surface of the bore is determined. Is converted to a measurement signal corresponding to the bore diameter, and the measurement signal is amplified stepwise according to the rotation speed of the honing head before shifting from the semi-finishing process to the finishing process. And

According to an eighth aspect, in addition to the constituent features of any one of the fourth to seventh means, the workpiece is an engine cylinder block having a plurality of bores. Features.

[0019]

With the above arrangement, the workpiece having the bore is supported and fixed by the work fixing device. Next, the honing head is moved in the axial direction and inserted into the bore of the workpiece. Then, while the honing head is rotated by driving the head rotating device and the honing head is reciprocated in the axial direction, a plurality of grindstones are synchronously moved in the outer radial direction by the driving of the grindstone actuating device to the inner surface of the bore. And press-contact to grind the inner surface of the bore of the workpiece to perform honing. Here, the honing process includes a roughing process in which the roughing is performed at a high speed of the honing head and a semi-finishing process in which the rotating speed of the honing head is a medium speed after performing the roughing. And a finishing step of performing finishing while the rotation speed of the honing head is low after performing the semi-finishing.

Under the above-mentioned operation, air is injected from the air nozzle to the inner surface of the bore after or before the transition to the semi-finishing step, and the pressure fluctuation or flow rate fluctuation of the air is detected by the converter. The bore diameter is measured by converting the signal into a measurement signal corresponding to the diameter.

Before the transition from the semi-finishing process to the finishing process, the measurement signal is amplified by an amplifier in accordance with the rotation speed of the honing head. Further, when the rotation speed of the honing head is changed (increased or decreased) due to clogging of the grindstone, change of the grindstone, etc. in the semi-finishing process or the finishing process, the measurement signal is rotated by the amplifier. Amplify according to speed.

When the amplifier converts a measurement signal corresponding to a predetermined machining diameter after the completion of the finishing process, the controller controls the grinding wheel operating device to move the plurality of grinding wheels in the outer radial direction. Let me stop.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to this embodiment will be described below with reference to the drawings.

Referring to FIGS. 1 and 2, a lower portion of a main body frame 3 (FIG. 1) of a honing apparatus 1 according to this embodiment is shown.
In the lower part of FIG.
A work fixing device 5 for supporting and fixing a workpiece W having a bore H is provided. The work fixing device 5 includes a support table 7 for supporting the workpiece W and a clamp for clamping an end of the workpiece W. And a clamping device 9 for performing the operation.

Above the work fixing device 5, a honing head 11 is provided so as to be rotatable and reciprocally movable in the axial direction (in the depth direction of the bore H and in the vertical direction in this embodiment).

More specifically, a cylindrical rotary sleeve 1 is provided above the work fixing device 5 above the main body frame 3.
3 is provided rotatably via a support member 15. In order to rotate the rotary sleeve 13, a head rotation motor 17 is provided at an appropriate position on the main body frame 3, and the rotation shaft of the head rotation motor 17 connects the sprockets 19, 21 and the chain 23 to the rotary sleeve 13. Connected via The rotating sleeve 13 has a spindle 2
5 is provided so as to be vertically movable, and the spindle 25 cannot rotate with respect to the rotary sleeve 13 by the action of a key or a spline. In order to move the spindle 25 in the vertical direction, a head axis moving cylinder 29 having a vertically movable piston rod 27 is provided on the upper part of the main body frame 3. 25 is rotatably connected to the upper end portion through appropriate means. A cylindrical head body 31 of the honing head 11 is integrally connected to a lower end of the spindle 25.

With the above configuration, the head rotating motor 17
Of the rotary sleeve 13 by driving the sprockets 19, 2
1. By rotating through the chain 23, the spindle 25 and the honing head 11 can be integrally rotated. The honing head 11 can be integrally moved in the axial direction by moving the spindle 25 in the axial direction (vertical direction) by driving the head shaft moving cylinder 29.

The honing head 11 has a plurality of grindstones 33 at appropriate intervals in the circumferential direction, and the plurality of grindstones 33 are movable in the radial direction.

More specifically, a plurality of slits 35 are provided in the cylindrical head body 31 at appropriate intervals in the circumferential direction, and each slit 35 is provided with a grindstone shoe 37 having a grindstone 33 on the outside. Each is provided so as to be movable in the radial direction. A ring-shaped spring 39 is provided at the upper end and the lower end of the plurality of grindstone shoes 37 so as to bias the plurality of grindstone shoes 37 in the inner radial direction.

In order to move the plurality of grindstones 33 in the outer radial direction in synchronization with each other, an operating rod 43 having a plurality of taper cones 41 for pressing the plurality of grindstone shoes 37 in the outer radial direction is provided in the head main body 31. It is provided movably. In order to move the operating rod 43 up and down, an operating cylinder 47 having a piston rod 45 capable of pressing the operating rod 43 from above is provided inside the spindle 25, and the operating rod 43 is appropriately provided. It is urged upward by the action of the spring 49.

With the above structure, the piston rod 45 is moved downward by driving the operating cylinder 47 and the operating rod 43 is pressed from above, whereby the operating rod 43 is moved downward against the urging force of the spring 49. Then, the plurality of grindstone shoes 37 are pressed and moved in the outer radial direction while resisting the urging force of the spring 39 in synchronization with the action of the taper cone 41. Thus, the plurality of grindstones 33 can be moved in the outer radial direction synchronously.

Further, the piston rod 45 is moved upward by the driving of the working cylinder 47 to release the pressing state of the working rod 43, so that the working rod 43 is moved upward together with the urging force of the spring 49. The plurality of grindstone shoes 37 are moved in the inner radial direction in synchronization with the urging force of the spring 39. by this,
The plurality of grindstones 33 can be synchronously moved in the inner radial direction.

The head body 31 is provided with a plurality of carbide guides 51 at appropriate intervals in the circumferential direction in addition to the slit 35.
To the bore H of the workpiece W.

The honing apparatus 1 according to this embodiment has a bore H
An air measuring device 53 for measuring the processing diameter of the workpiece is provided.

More specifically, referring to FIGS. 1, 3, and 4, an appropriate number of carbide guides 5 out of the plurality of carbide guides 51 are shown.
1 is provided with an air nozzle 55 for injecting air to the bore inner surface Ha, and the air nozzle 55 is connected to the air passages 57 and 5.
9 and an air source 61 via appropriate means. The air passage 59 is connected to an A / E converter 63 for converting the pressure fluctuation (or flow rate fluctuation) of the air into a measurement signal (fixed-size signal) corresponding to the processing diameter of the bore H. An amplifier 65 is connected to the A / E converter 63.
When the rotation speed of the honing head 11 changes (increases or decreases), for example, when the rotation speed of the honing head 11 increases by 10%, the measurement signal is amplified by 10%. In this case, the signal is amplified stepwise as shown in FIG. This amplifier 65 is connected to a control device 67,
The control device 67 is connected with an encoder 69 provided in the working cylinder 47 and the head rotation motor 17. The control device 67 controls the amplifier 65
When the measurement signal corresponding to the predetermined processing diameter is amplified by the control, control is performed so that the piston rod 45 of the working cylinder 47 stops moving downward.

Next, a honing method according to this embodiment will be described.

A workpiece having a bore H (a cylinder block for an engine having a plurality of bores H in this embodiment) is supported on a support base 7 of the workpiece fixing device 5, and the workpiece is held by a clamp device 9. Clamp the end of W. Next, the honing head 11 is moved downward by driving the head shaft moving cylinder 29 and inserted into the bore H. The honing head 11 is rotated by the driving of the head rotating motor 17 and the honing head 1 is driven by the driving of the head axis moving cylinder 29.
By moving the plurality of grindstones 33 in the outer radial direction synchronously by driving the operation cylinder 47 while reciprocating the shaft 1 in the axial direction (up and down direction), and pressing the grindstones 33 against the inner surface Ha of the bore of the workpiece W. The honing process is performed by grinding the inner surface Ha of the bore. Here, the honing processing includes a roughing step of performing roughing with the rotation speed of the honing head 11 at a high speed, and a medium speed process with the rotation speed of the honing head 11 at a medium speed state after performing the roughing. A semi-finishing process for performing the finishing process, and a finishing process for performing the finishing process while the rotation speed of the honing head 11 is low after performing the semi-finishing process.

Under the above-described operation, air is injected from the air nozzle 55 to the bore inner surface Ha after or before the transition to the semi-finishing step, so that the A / E converter 63
Pressure fluctuations or flow fluctuations of the air due to the bore inner surface Ha.
By converting into a measurement signal corresponding to the processing diameter of the bore H, the processing diameter of the bore H is measured. Before shifting to the finishing process (before shifting from the beginning of the intermediate finishing process to the finishing process, or before shifting to the finishing process from the middle of the intermediate finishing process), the amplifier 65 converts the measurement signal to the rotation speed of the honing head 11. Amplify accordingly. Further, when the rotation speed of the honing head 11 is changed (increased or decreased) due to clogging of the grindstone 33, change of the grindstone 33, or the like in the semi-finishing process or the finishing process, the measurement signal is honed by the amplifier 65. Amplification is performed according to the rotation speed of the head 11.

Then, when the measuring signal corresponding to the predetermined machining diameter is output by the amplifier 65 after shifting to the finishing step, the control device 67 controls the working cylinder 47 to move the plurality of grindstones 33 in the outer radial direction. Let me stop moving.

According to the invention of this embodiment, the measurement signal corresponding to the processing diameter of the bore H is amplified according to the rotation speed of the honing head 11 before shifting to the finishing step, so that in the semi-finishing step. The measurement accuracy of the processing diameter of the bore H is not remarkably inferior to the measurement accuracy of the processing diameter of the bore H in the finishing process, and the grinding amount in the intermediate finishing processing is considerably larger or smaller than a predetermined grinding allowance. Will not be done. Therefore, since an appropriate grinding allowance can be taken in the finishing process, the necessary and sufficient finishing is performed to improve the honing accuracy, and the work efficiency is improved by avoiding unnecessary finishing time. Can be achieved.

Further, during the semi-finishing step or the finishing step,
For reasons such as clogging of the grindstone 33 and change of the grindstone 33,
When the rotation speed of the honing head 11 is changed, the measurement signal can be amplified in accordance with the rotation speed of the honing head 11, and the amplitude of the output of the measurement signal is stable, and Performing the measurement improves the honing accuracy.

[0042]

As will be understood from the above description of the embodiments, according to the first to eighth aspects of the present invention,
Before shifting to the finishing process, the measurement signal corresponding to the bore diameter is amplified according to the rotation speed of the honing head, so that the measurement accuracy of the bore diameter in the semi-finishing process can be improved. This is not significantly inferior to the measurement accuracy of the above, and the amount of grinding in the semi-finishing processing does not become much larger or smaller than a predetermined grinding allowance. Therefore, since an appropriate grinding allowance can be taken in the finishing process, the necessary and sufficient finishing is performed to improve the honing accuracy, and the work efficiency is improved by avoiding unnecessary finishing time. Can be achieved.

According to the invention as set forth in claims 1 to 5 or 8, in addition to the above effects, during the semi-finishing step or the finishing step, the grinding wheel may be clogged or the grinding wheel may be changed. When the rotation speed of the honing head is changed, the measurement signal can be amplified in accordance with the rotation speed of the honing head. To improve honing accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a honing device according to the present embodiment.

FIG. 2 is a cross-sectional view of the honing head.

FIG. 3 is a block diagram showing a control device.

FIG. 4 is a diagram showing a rate of change in the rotation speed of the honing head and a rate of change in the amplification.

FIG. 5 is a diagram illustrating a relationship between a rotation speed of a honing head and a measurement signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Honing device 5 Work fixing device 11 Honing head 17 Head rotation motor 33 Grinding wheel 47 Working cylinder 53 Air measuring device 55 Air nozzle 63 A / E converter 65 Amplifier 67 Control device W Workpiece H Bore Ha Bore inner surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B24B 33/00-33/10 B23Q 17/20-17/22 B24B 49/00-49/10 G01B 13 / 08-13/10

Claims (8)

(57) [Claims] A work fixing device for supporting and fixing a workpiece having a bore is provided. A honing head is provided at a position facing the work fixing device so as to be rotatable and reciprocally movable in an axial direction. A plurality of whetstones that can be moved in the radial direction are provided at appropriate intervals in the circumferential direction, and a whetstone actuating device that moves the plurality of whetstones in the outer radial direction in synchronization with each other is further provided, and the honing head further includes a bore of the bore. An air nozzle for injecting air to the inner surface is provided, and a converter for converting pressure fluctuation or flow rate fluctuation of the air into a measurement signal corresponding to the processing diameter of the bore is provided. A honing apparatus comprising an amplifier for amplifying a signal in accordance with a rotation speed of the honing head. 2. A honing head is provided at a position opposed to the work fixing device so as to be rotatable and reciprocally movable in the axial direction. A plurality of whetstones that can be moved in the radial direction are provided at appropriate intervals in the circumferential direction, and a whetstone actuating device that moves the plurality of whetstones in the outer radial direction in synchronization with each other is further provided. An air nozzle for injecting air, and a converter for converting a pressure fluctuation or a flow rate fluctuation of the air into a measurement signal corresponding to the processing diameter of the bore. A honing device comprising an amplifier that amplifies in a stepwise manner in accordance with the rotation speed of a honing head. 3. A control device for controlling the wheel operating device so that when a measurement signal corresponding to a predetermined processing diameter is amplified by the amplifier, the plurality of wheels are stopped from moving in the outer radial direction. The honing device according to claim 1 or 2, wherein 4. A honing head provided with a plurality of whetstones at appropriate intervals in a circumferential direction is rotated and reciprocated in an axial direction, while simultaneously moving the plurality of whetstones in an outer radial direction to thereby obtain a coating. In a honing method for performing honing by grinding an inner surface of a bore in a workpiece, a pressure variation or a flow variation of air injected from an air nozzle provided on the honing head to the inner surface of the bore is measured in accordance with a processing diameter of the bore. A honing processing method comprising the step of: converting the measured signal into a signal when the rotational speed of the honing head changes. 5. A method in which a plurality of grinding wheels are synchronously moved in the outer radial direction while rotating and axially reciprocating a honing head provided with a plurality of grinding wheels at appropriate intervals in a circumferential direction. In a honing method for performing honing by grinding the inner surface of a bore of a bore in a workpiece, a pressure variation or a flow rate variation of air injected from an air nozzle provided in the honing head to the inner surface of the bore is changed to a processing diameter of the bore. Converting a corresponding measurement signal into a corresponding measurement signal, wherein when the rotation speed of the honing head changes, the measurement signal is amplified stepwise in accordance with the rotation speed. 6. A honing head provided with a plurality of whetstones at appropriate intervals in a circumferential direction is rotated and reciprocated in an axial direction, while simultaneously moving the plurality of whetstones in an outer radial direction to thereby provide a covering. In a honing method for performing honing by grinding an inner surface of a bore of a bore in a workpiece, a roughing step of performing roughing under a high-speed state of the honing head, and a honing head after performing the roughing. A semi-finishing process in which the semi-finishing process is performed at a rotation speed of medium speed, and a finishing process of performing a finishing process in a low-speed state of the honing head after performing the semi-finishing process. After or before shifting to the process, the pressure fluctuation or flow rate fluctuation of the air injected from the air nozzle provided in the honing head to the inner surface of the bore is determined by And conversion to the measured signal corresponding to the machining diameter, before the transition from the semi-finishing step finishing process, honing method characterized by comprising amplified the measurement signal corresponding to the rotational speed of the honing head. 7. A honing head provided with a plurality of whetstones at appropriate intervals in the circumferential direction is rotated and reciprocated in the axial direction, and the plurality of whetstones are synchronously moved in the outer radial direction. In a honing method for performing honing by grinding an inner surface of a bore of a bore in a workpiece, a roughing step of performing roughing under a high-speed state of the honing head, and a honing head after performing the roughing. A semi-finishing process in which the semi-finishing process is performed at a rotation speed of medium speed, and a finishing process of performing a finishing process in a low-speed state of the honing head after performing the semi-finishing process. After or before shifting to the process, the pressure fluctuation or flow rate fluctuation of the air injected from the air nozzle provided in the honing head to the inner surface of the bore of the bore is determined. Converting to a measurement signal corresponding to the processing diameter of the bore, and amplifying the measurement signal in a stepwise manner corresponding to the rotation speed of the honing head before shifting from the semi-finishing process to the finishing process. Honing method. 8. The honing method according to claim 4, wherein the workpiece is a cylinder block for an engine having a plurality of bores.