JP3275590B2 - 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 honing head having a proper spacing in a circumferential direction while rotating and reciprocating a spindle integrally provided with a honing head in a depth direction of a bore of a workpiece. The present invention relates to a honing apparatus and a honing method for performing honing on an inner surface of a bore of a workpiece by synchronously moving a plurality of provided grindstones in an outer 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 spindle integrally provided with 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 depth direction of the bore. The honing head is provided with 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 grinding wheel operating device includes an operating rod having a tapered cone as shown in Japanese Utility Model Laid-Open Publication No. Hei 3-11554, a grinding wheel operating cylinder for moving the operating rod in the depth direction, and the like.

In order to measure the processing diameter of the portion to be measured in the depth direction of the bore at the time of honing, the honing head is provided with an air nozzle for injecting air, and the pressure fluctuation of the air is measured at an appropriate position. A converter is provided for converting into a measurement signal corresponding to the machining diameter of the part. In order to measure the depth position of the measured portion of the bore, for example, a spindle is provided with a linear scale extending in the depth direction, and a fixed portion is provided with a depth for electrically or magnetically measuring the scale of the linear scale. A position measuring sensor is provided.

Therefore, the workpiece having the bore is supported and fixed by the work fixing device.

Next, the honing head is moved in the depth direction approaching the work fixing device and inserted into the bore.
Then, while rotating the honing head and reciprocating the honing head in the depth direction, a plurality of grindstones are synchronously moved in the outer radial direction by driving the grindstone working cylinder in the grindstone actuating device, and are moved relative to the bore inner surface. Honing is performed on the inner surface of the bore of the workpiece by pressing. During the honing process, air is injected from the air nozzle to the inner surface of the bore, and the pressure change of this air is converted by the converter into a measurement signal corresponding to the processing diameter of the measured part of the bore. Measure the diameter. In addition, the depth position measurement sensor electrically or magnetically measures the depth position of the measured portion of the bore. When the measurement signal corresponding to the predetermined machining diameter is converted by the converter when the predetermined depth position is measured by the depth position measurement sensor, the control device appropriately controls the grinding wheel working cylinder. To stop the plurality of grinding wheels from moving in the outer radial direction.

[0007]

Since the depth position of the measured portion in the depth direction of the bore is measured electrically or magnetically by the depth position measuring sensor, the depth position of the measured portion is determined. Is highly responsive, and no significant delay occurs in measuring this depth position. On the other hand, since the processing diameter of the measured portion of the bore is measured using air as a medium, the measurement of the processing diameter has low response, and a large delay time occurs in the measurement of the processing diameter. The delay time is not always constant and irregular due to reasons such as a change in temperature in the morning and evening, a change in environmental temperature such as a change in temperature in summer and winter, and a change in usage of the air supply source. Therefore, there is a time lag between the measurement of the depth position of the measured portion of the bore and the measurement of the processing diameter of the measured portion, so that the processing diameter of the bore becomes a predetermined processing diameter at a predetermined depth position. Honing processing is difficult, and there is a problem that honing processing accuracy deteriorates.

[0008]

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 spindle integrally provided with a honing head is provided at a position facing the work fixing device so as to be rotatable and reciprocally movable in the depth direction of the bore, and the honing head is provided with a plurality of radially movable grindstones. The honing head is equipped with a honing head to measure the processing diameter of the part to be measured in the depth direction of the bore. A first air nozzle for injecting air to the inner surface, and a pressure of air injected from the first air nozzle in a first air passage connecting the first air nozzle and the first air source; A first converter for converting a dynamic or flow rate variation into a first measurement signal corresponding to a processing diameter of the measured portion in the depth direction of the bore is provided, and a depth position of the measured portion in the bore is measured. Therefore, a detection target having a tapered surface inclined in the depth direction is provided on one of the spindle or the fixed portion, and a second air nozzle for injecting air to the tapered surface on the other of the fixed portion or the spindle is provided. In the middle of the second air passage connecting the second air nozzle and the second air source, the pressure fluctuation or the flow fluctuation of the air injected from the second air nozzle is measured in the second measurement corresponding to the depth position of the part to be measured. A second converter for converting the signal into a signal is provided, and between the first air nozzle and the first converter in the first air passage, in order to make measurement conditions in the first and second converters substantially the same. Part air volume , And characterized by being constituted of an air volume of the portion between the second converter and the second air nozzle in the second air passage to be substantially the same.

As a second means, in addition to the constituent elements of the first means, the first air source and the second air source are used as a common air source.

As a third means, in addition to the constituent elements of the first means or the second means, an air volume of a portion between the first converter and the first air source in the first air passage is determined. ,
The air volume of the portion between the second converter and the second air source in the second air passage is configured to be substantially the same.

As a fourth means, in addition to the constituent elements of any one of the first means to the third means, a second measurement signal corresponding to a predetermined depth position by the second converter is provided. When a first measurement signal corresponding to a predetermined machining diameter is converted by the first converter when the first wheel is converted, the wheel operating device is configured to stop the plurality of wheels from moving in the outer radial direction. And a control device for controlling the

As a fifth means, the honing head is provided with a proper spacing in the circumferential direction while rotating and reciprocating a spindle integrally provided with the honing head in the depth direction of the bore of the workpiece. In the honing method of performing honing on the inner surface of the bore of the workpiece by synchronously moving a plurality of whetstones in the outer radial direction, to measure the processing diameter of the measured part in the depth direction of the bore. Injecting air from a first air nozzle provided in the honing head to a portion to be measured, and using a first converter provided in the middle of a first air passage connected to the first air nozzle, the air is supplied to the measurement target. Converting the pressure fluctuation or the flow rate fluctuation into a first measurement signal corresponding to the processing diameter of the measured part, and measuring the depth position of the measured part of the bore by using the fixed part or the spine. A second air nozzle provided on one of the dollars injects air onto a tapered surface inclined in the depth direction of the detection object provided on the other of the spindle or the fixed portion, and a second air nozzle connected to the second air nozzle. 2
Converting a pressure fluctuation or a flow rate fluctuation of the air into a second measurement signal corresponding to the depth position of the measured portion by a second converter arranged in the middle of the air passage, In order to make the measurement conditions in the first and second converters substantially the same, the air volume in a portion between the first air nozzle and the first converter in the first air passage and the air volume in the second air passage The air volume in a portion between the second air nozzle and the second converter is made substantially the same.

According to a sixth aspect, in addition to the constituent features of the fifth aspect, the workpiece is a cylinder block for an engine having a plurality of bores.

[0014]

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 approaching the work fixing device and inserted into the bore. Then, while the spindle integrally provided with the honing head is rotated and reciprocated in the depth direction of the bore of the workpiece, the honing head is provided with an appropriate interval in the circumferential direction by driving the grindstone operating device. The honing work is performed on the inner surface of the bore of the workpiece by synchronously moving the grindstone in the outer radial direction and pressing against the inner surface of the bore.

In order to measure the processing diameter of the portion to be measured in the depth direction of the bore under the above operation, air is injected from the first air nozzle provided with the honing head to the portion to be measured. The air pressure fluctuation or flow fluctuation is converted into a first measurement signal corresponding to the processing diameter of the measured part.
Further, in order to measure the depth position of the measured portion of the bore, the second air nozzle provided on one of the fixed portion and the spindle is inclined in the depth direction on the detection object provided on the other of the spindle and the fixed portion. The air is jetted onto the tapered surface, and the pressure fluctuation or flow rate fluctuation of the air is converted into a second measurement signal corresponding to the depth position of the measured portion.

When the second converter converts a second measurement signal corresponding to a predetermined depth position, the first converter converts a first measurement signal corresponding to a predetermined processing diameter. Then, the controller controls the grindstone operating device to stop the plurality of grindstones from moving in the outer radial direction.

[0017]

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

Referring to FIG. 1 and FIG. 2, a lower portion (FIG. 1) of a main body frame 3 in a honing apparatus 1 according to the present embodiment.
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 workpiece fixing device 5, a spindle 13 having a honing head 11 is rotatable and has a bore H.
Are provided so as to be able to reciprocate in the depth direction (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.
5 is rotatably provided via a support member 17. In order to rotate the rotary sleeve 15, a rotary motor 19 is provided at an appropriate position above the main body frame 3, and the rotary shaft of the rotary motor 19 is attached to the rotary sleeve 15 via sprockets 21, 23 and a chain 25. Connected.
The rotary sleeve 15 is provided with a spindle 13 movably in the vertical direction, and the spindle 13 cannot rotate with respect to the rotary sleeve 15 by the action of a key or a spline. In order to move the spindle 13 vertically, the reciprocating cylinder 2 having a vertically movable piston rod 27 on the upper part of the main body frame 3.
The distal end of the piston rod 27 is rotatably connected to the upper end of the spindle 13 via appropriate means. A cylindrical head body 31 of the honing head 11 is integrally connected to a lower end of the spindle 13.

With the above configuration, the head rotating motor 19
Drives the rotary sleeve 15 to sprockets 21 and
3. By rotating through the chain 25, the spindle 13 and the honing head 11 can be integrally rotated. The honing head 11 can be integrally moved in the depth direction by moving the spindle 13 in the depth direction (vertical direction) by driving the reciprocating 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 a radial direction (a radial direction of the honing head 11).

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 tapered cones 41 for pressing the plurality of grindstone shoes 37 in the outer radial direction is provided in the head body 31 in the vertical direction. It is provided movably. In order to move the operating rod 43 up and down, the grinding wheel operating cylinder 4 having a piston rod 45 capable of pressing the operating rod 43 from above is provided inside the spindle 25.
The operating rod 43 is urged upward by the action of an appropriately provided spring 49.

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

The piston rod 45 is moved upward by the driving of the grinding wheel operating cylinder 47 so that the operating rod 4
By releasing the pressing state of 3, the operating rod 43 is moved upward together with the urging force of the spring 49, and the plurality of grindstone shoes 37 are moved in the inner radial direction in synchronization with the urging force of the spring 39. . Thus, 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, and the plurality of carbide guides 51 are provided on the head body 31.
To the bore H of the workpiece W.

The honing apparatus 1 according to this embodiment has a bore H
Is provided with a first air measuring device 53 for measuring the processing diameter of the portion to be measured in the depth direction.

More specifically, referring to FIGS. 1 and 3,
The first air nozzle 5 for injecting air to the bore inner surface Ha is provided to an appropriate number of the carbide guides 51 among the plurality of carbide guides 51.
5 is provided, and the first air nozzle 55 is connected to the first air passage 5.
7 and a sub air circuit 59 connected to the air source 61. In the first air passage 57, the pressure fluctuation (or the flow rate fluctuation) of the air is set to a first value corresponding to the processing diameter of the measured portion of the bore H.
First A / E converter 63 for converting to a measurement signal (fixed-size signal)
Are connected, and the first A / E converter 63 is connected to the control device 65. The grindstone working cylinder 47 is connected to the control device 65.

In addition to the first air measuring device 53, the honing device 1 measures the depth position of the measurement target portion of the bore H (in this embodiment, the same as the height position of the first air nozzle 55). A two-air measuring device 67 is provided.

More specifically, the spindle 13 is provided with a detection object 71 having a tapered surface 69 inclined in the depth direction, and air is supplied to the tapered surface 69 near the spindle 13 in the fixed portion 73. A second air nozzle 75 for jetting is provided. Here, as shown in FIG.
Instead of providing the second air nozzle 75, the detection target 71 may be provided near the spindle 13 in the fixing portion 73, and the second air nozzle 75 may be provided on the spindle 13. Further, the detected object 71 provided on the spindle 13 or the fixed portion 73 is shown in FIGS.
4 (a) and FIG.
As shown in (b), it may be configured in a ring shape.

The second air nozzle 75 is connected to the second air passage 7
7 and the sub air passage 59, and is connected to the air source 61.
A second A / E converter 79 is provided for converting a pressure variation or a flow variation of the air injected from the air nozzle 75 into a second measurement signal corresponding to the depth position of the measured part.

The second A / E converter 79 has a first A / E converter.
Similarly to the converter 63, the controller 65 is connected to the control device 65. When the second A / E converter 79 converts the second measurement signal corresponding to the predetermined depth position, the control device 65 When the first measurement signal corresponding to the predetermined machining diameter is converted by the first A / E converter 63, the grinding wheel operating cylinder 47 is controlled so as to stop the plurality of grinding wheels 33 from moving in the outer radial direction. It is.

Here, the air volume of the portion between the first air nozzle 55 and the first A / E converter 63 in the first air passage 57, and the second air nozzle 75 and the second A / E conversion in the second air passage 77 It is configured so that the air volume of the portion between the containers 79 is substantially the same. Further, the air volume in the portion between the first A / E converter 63 and the air source 61 in the first air passage 57 and the second air volume in the second air passage 77
The air volume in the portion between the / E converter 79 and the air source 61 is configured to be substantially the same.

Next, the 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 work fixing device 5, and the workpiece is clamped by a clamping device 9. Clamp the end of W. Next, the honing head 11 is moved downward by driving the reciprocating cylinder 29 to be inserted into the bore H. The honing head 11 is rotated by the rotation motor 17 and the reciprocating cylinder 29 is driven to reciprocate the honing head 11 in the axial direction (vertical direction).
The honing work is performed on the bore inner surface Ha by driving the plurality of grindstones 33 in the outer radial direction synchronously by the driving of the drive unit 7 and pressing the grindstones 33 against the bore inner surface Ha of the workpiece W.

Under the above operation, in order to measure the processing diameter of the measured portion in the depth direction of the bore H, air is injected from the first air nozzle 55 to the measured portion,
The A / E converter 63 converts the pressure fluctuation or the flow rate fluctuation of the air into a first measurement signal corresponding to the processing diameter of the part to be measured.

Further, in order to measure the depth position of the portion to be measured of the bore H, air is jetted from the second air nozzle 75 to the object 71 to be detected, and the second A / E converter 7 is used.
9 converts the pressure fluctuation or flow rate fluctuation of the air into a second measurement signal corresponding to the depth position of the measured part.

When the second A / E converter 79 converts the second measurement signal corresponding to the predetermined depth position, the first A / E converter 63 converts the second measurement signal corresponding to the predetermined processing diameter. When one measurement signal is converted, the controller 65 controls the grindstone working cylinder 47 to stop the plurality of grindstones 33 from moving in the outer radial direction.

According to the invention of this embodiment, the measurement of the processing diameter of the measured portion in the depth direction of the bore H and the measurement of the depth position of the measured portion are both performed using air as a medium. The measurement conditions for the processing diameter of the measurement part and the measurement conditions for the depth position of the processing part are almost the same. Irregular delay time does not occur only in one measurement. And measurement of the depth position), an irregular delay time occurs. In particular, the air volume of the portion between the first air nozzle 55 and the first converter 63 in the first air passage 57 and the air volume of the portion between the second air nozzle 75 and the second converter 79 in the second air passage 77 And the air source 61 in the first air measuring device 53 and the air source 61 in the second air measuring device 67 are made common, so that the responsiveness of measurement in the first and second converters 63 and 79 is improved. By making them approximately equal, it is possible to reliably suppress a time lag between the measurement of the processing diameter of the processed portion and the measurement of the depth position of the processed portion. Therefore, honing can be easily performed so that the bore diameter becomes a predetermined diameter at a predetermined depth position.

The object 71 to be detected is shown in FIG.
In the case of a non-annular configuration as shown in (a), the rotational position (rotary plate) of the honing head 11 can also be measured by the second air measuring device 67.

[0042]

As will be understood from the above description of the embodiment, according to any one of the first to sixth aspects of the present invention, the portion to be measured in the depth direction of the bore is provided. Since the measurement of the processing diameter of the workpiece and the measurement of the depth position of the part to be measured are both performed using air as a medium, an irregular delay time does not occur in only one of the measurements, and an irregular delay time occurs in both of the measurements. A regular delay time occurs. In particular, the air volume of the portion between the first air nozzle and the first converter in the first air passage is substantially equal to the air volume of the portion between the second air nozzle and the second converter in the second air passage. , The response of the measurements in the first and second converters is made substantially equal, and the time lag between the measurement of the processing diameter of the processing portion and the measurement of the depth position of the processing portion. Can be reliably suppressed. Therefore, honing can be easily performed so that the bore diameter becomes a predetermined diameter at a predetermined depth position.

Further, according to the invention described in any one of the second to fourth aspects, the first air source and the second air source are commonly used, so that the above-mentioned effect is further enhanced. Can be improved.

[Brief description of the drawings]

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

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

FIG. 3 is a control block diagram according to the embodiment.

FIG. 4 is a view taken along the line IV-IV in FIG. 3;

FIG. 5 is a diagram showing an attitude in which the positions of a second air nozzle and a detection target are changed.

FIG. 6 is a view taken along the line VI-VI in FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 honing device 11 honing head 13 spindle 33 grindstone 47 grindstone working cylinder 53 first air measuring device 55 first air nozzle 57 first air passage 61 air source 63 first A / E converter 67 second air measuring device 69 tapered surface 71 Detector 73 Fixed part 75 Second air nozzle 77 Second air passage 79 Second A / E converter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B24B 33/00-33/08 B24B 49/06-49/10 B23Q 17/20-17/22 G01B 13 / Ten

Claims (6)

(57) [Claims] A work fixing device for supporting and fixing a workpiece having a bore is provided, and a spindle integrally provided with a honing head is rotatable at a position facing the work fixing device and can be rotated in a depth direction of the bore. The honing head is provided with a plurality of radially movable grindstones at appropriate intervals in the circumferential direction, and the honing head is provided with a grindstone actuating device that synchronously moves the plurality of grindstones in the outer radial direction. In order to measure the processing diameter of the portion to be measured in the depth direction of the bore, the honing head includes a first air nozzle for injecting air to the inner surface of the bore, and a first air nozzle connected to the first air source. In the middle of one air passage, a pressure variation or a flow variation of the air injected from the first air nozzle is changed to a first value corresponding to the processing diameter of the measured part in the depth direction of the bore.
A first converter for converting the measurement signal into a measurement signal, wherein one of the spindle and the fixed portion has a tapered surface inclined in a depth direction for measuring a depth position of the measured portion of the bore; A body is provided, and a second air nozzle for injecting air to the tapered surface is provided on the other of the fixed portion or the spindle, and in the middle of a second air passage connecting the second air nozzle and a second air source, This second
A second converter for converting a pressure variation or a flow variation of the air injected from the air nozzle into a second measurement signal corresponding to the depth position of the part to be measured is provided, and a measurement condition in the first and second converters is set. In order to make them substantially the same, an air volume of a portion between the first air nozzle and the first converter in the first air passage, and an air volume between the second air nozzle and the second converter in the second air passage. A honing device characterized in that the air volume of the portion is substantially the same. 2. The honing apparatus according to claim 1, wherein the first air source and the second air source are used as a common air source. 3. An air volume in a portion of the first air passage between the first converter and the first air source, and
3. The honing apparatus according to claim 1, wherein an air volume of a portion of the air passage between the second converter and the second air source is substantially equal. . 4. When a second measurement signal corresponding to a predetermined depth position is converted by the second converter, a first measurement signal corresponding to a predetermined processing diameter is converted by the first converter. Then, a control device for controlling the grindstone actuating device so as to stop the plurality of grindstones from moving in the outer radial direction is provided, any one of claims 1 to 3 characterized by the above-mentioned. The honing device according to claim 1. 5. A plurality of whetstones provided with a honing head at appropriate intervals in a circumferential direction while rotating a spindle integrally provided with a honing head and reciprocating in a depth direction of a bore of a workpiece. In the honing method of performing honing processing on the inner surface of the bore of the workpiece by synchronously moving the outer diameter direction, the honing head is used to measure the processing diameter of the measured part in the depth direction of the bore. Injecting air from the first air nozzle provided in
Converting a pressure fluctuation or a flow rate fluctuation of the air into a first measurement signal corresponding to a processing diameter of a part to be measured by a first converter disposed in a first air passage connected to the air nozzle; In order to measure the depth position of the portion to be measured, the second air nozzle provided on one of the fixed portion or the spindle is inclined in the depth direction on the detection object provided on the other of the spindle or the fixed portion. In addition to injecting air to the tapered surface, a pressure change or a flow rate change of the air is changed to a depth position of the portion to be measured by a second converter arranged in the middle of a second air passage connected to the second air nozzle. Corresponding second
Converting the measurement signal into a measurement signal, in order to make the measurement conditions in the first and second converters substantially the same, between the first air nozzle and the first converter in the first air passage. The honing method is characterized in that the air volume of the portion is substantially the same as the air volume of the portion between the second air nozzle and the second converter in the second air passage. 6. The honing method according to claim 5, wherein the workpiece is a cylinder block for an engine having a plurality of bores.