JP3275585B2 - Honing method and honing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a honing head to which a grinding wheel is attached and rotated and axially moved while a grinding wheel is expanded and pressed against a work hole inner surface of a work with a predetermined expansion pressure. The present invention relates to a honing method and a honing apparatus for grinding an inner surface of a processing hole.

[0002]

2. Description of the Related Art In general, when finishing the inner surface of a processing hole of a work, for example, the inner surface of a cylinder bore in a cylinder block of an engine, honing is performed using a honing apparatus. In the honing process, the inner surface of a processing hole is ground using a grindstone. The grinding stone is usually a rectangular parallelepiped and is arranged at a plurality of equal intervals in a circumferential direction with a central axis direction of the processing hole as a longitudinal direction. Multiple whetstones
A tool called a horn, which is inserted into the processing hole and is arranged radially with respect to its central axis, is pressed against the inner surface of the processing hole, and is rotated and reciprocated in the axial direction to smooth the inner surface of the processing hole. Processing with high accuracy (Japanese Unexamined Patent Publication No. 56-7 / 1981)
6374).

FIG. 4 is a schematic diagram showing the configuration of a horning apparatus, in which a honing head 1 having a grindstone is used.
This shows a state in which honing is being performed on a cylinder bore 5 which is a processing hole of a cylinder block 3 which is a work. In the honing process, a coolant, which is a coolant controlled at a predetermined temperature, is mainly supplied between the honing head 1 and the cylinder bore 5 in the honing apparatus by the coolant supply device 7. The coolant supply device 7 operates in conjunction with the honing device. That is, the coolant is supplied along with the operation of the honing device, and the supply of the coolant stops when the operation of the honing device stops.

[0004]

In the honing process described above, the inner diameter of the cylinder bore 5 is slightly affected by the room temperature. 5A shows the temporal change of the room temperature, and FIG. 5B shows the temporal change of the error with respect to the target inner diameter value of each cylinder bore. According to this, it is understood that the error with respect to the target inner diameter value changes following the room temperature. For this reason, the correction value for the target inner diameter value is fed back to the honing apparatus based on the room temperature to perform the honing, thereby making it possible to reduce the processing error due to the change in the room temperature.

However, when the honing machine is stopped due to replacement of the honing head for honing a cylinder block having a different cylinder bore inner diameter, or some trouble occurs on the production line before and after the honing. In the meantime, the supply of coolant that is thermally affected by room temperature will also stop, so the cylinder block that was continuously receiving coolant before it stopped will not receive coolant after it stopped. The thermal stability corresponding to the room temperature up to now is broken, and the change in the inner diameter of the cylinder bore following the room temperature as shown in FIG. 5 causes a discontinuity A of the diameter change as shown in FIG. Will be.

In the above-mentioned discontinuous point A, as shown in FIG.
(A) does not coincide with the room temperature, and therefore, the diameter correction value cannot be fed back according to the room temperature, and the processing accuracy is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to continuously change the error of the finished diameter in a machining hole between works corresponding to room temperature even when the operation of the honing machine is stopped.

[0008]

In order to achieve the above object, the present invention firstly provides a honing head for holding a grindstone which is pressed with a predetermined processing pressure against the inner surface of a processing hole of a work, by rotating and rotating a shaft. While receiving the supply of the cooling liquid while moving in the direction, based on the room temperature, feedback the correction value for the target inner diameter value of the processing hole, in the honing processing method of grinding the inner surface of the processing hole, When a plurality of workpieces are continuously machined, even when the operation of the honing machine equipped with the honing head is stopped during the continuous machining, the supply of the coolant is continued.

Second, in the first machining method, the work is a cylinder block, the machining hole is a cylinder bore of the cylinder block, and a water jacket that opens in the outer peripheral portion of the cylinder bore in the same direction as the honing head insertion side. And a processing method for supplying a coolant to the inner surface of the cylinder bore from a side opposite to a direction in which the honing head is inserted, when performing honing processing on the cylinder bore.

Third, in the first processing method, when performing a honing process on a workpiece having an opening hole in the outer peripheral portion of the processing hole in the same direction as the insertion side of the honing head, the opening hole is formed. This is a processing method in which a coolant is supplied in the closed state from the same direction as the insertion direction of the honing head.

Fourth, a honing head for holding a grindstone pressed with a predetermined working pressure against the inner surface of a working hole of a workpiece rotates and moves in the axial direction while receiving a supply of a cooling liquid from a cooling liquid supply means. In a honing machine that performs a grinding process on the inner surface of the processing hole by feeding back a correction value to a target inner diameter value of the processing hole based on the operation of the cooling liquid supply unit, a plurality of workpieces are processed. Even when the operation of the present apparatus is stopped during continuous processing, the apparatus is configured to be continuously performed.

Fifth, in the fourth configuration, the workpiece is a cylinder block, the machining hole is a cylinder bore of the cylinder block, and the cylinder block is opened in the outer peripheral portion of the cylinder bore in the same direction as the honing head insertion side. And a coolant discharge port of the coolant supply means is arranged toward the inner surface of the cylinder bore on a side opposite to a direction in which the honing head is inserted into a processing hole.

Sixth, in the fourth configuration, the workpiece is:
An opening is provided on the outer periphery of the processing hole in the same direction as the insertion side of the honing head, and a closing member for closing the opening of the opening is arranged on the work.

Seventh, in the sixth configuration, the closing member has a through hole into which the honing head can be inserted, and a coolant discharge port in the coolant supply means is provided on an inner surface of the through hole.

[0015]

According to the first method or the fourth configuration, even when the operation of the honing apparatus is stopped, the supply of the cooling liquid to the inner surface of the processing hole is continuously performed. Cooling fluid is supplied in the same way as the work being machined before the stop, the work is thermally stable before and after the machine is stopped, and the error in the bore diameter of the work is a continuous one that follows the room temperature. Becomes

According to the second method or the fifth configuration, since the coolant is supplied toward the cylinder bore from the side of the outer periphery of the cylinder bore opposite to the opening of the water jacket, the supplied coolant is supplied to the water jacket. Inflow is prevented. It is.

According to the third method or the sixth configuration, even if the coolant is supplied from the opening side of the opening that opens in the same direction as the direction in which the honing head is inserted, the opening is closed. Therefore, the flow of the cooling liquid into the opening hole is avoided.

According to the seventh configuration, even if the coolant is discharged from the coolant discharge port located in the same direction as the direction in which the honing head is inserted, the opening is closed. Coolant inflow is avoided.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic structural view of a honing machine according to an embodiment of the present invention. A cylinder block 9 as a work is set on a machining table 10, and machining of the cylinder block 9 is performed. Honing processing is performed on the inner surface of the cylinder bore 11 by the honing head 13. In the cylinder block 9, a water jacket 10 is formed in an outer peripheral portion of the cylinder bore 11 as an opening hole opening upward.

The honing head 13 is inserted into the main body 15 and can be moved up and down by a hydraulic cylinder (not shown). A plurality of honing heads 13 are pressed toward the inner surface of the cylinder bore 11 by descending the taper cone 17 and are arranged in a plurality in the circumferential direction. And a rectangular parallelepiped grindstone 21 that is mounted on the outer peripheral surface of the shoe 19 and grinds the inner surface of the cylinder bore 11 in the figure in the vertical direction. The honing head 13 drives a vertically moving cylinder and a rotary motor (not shown) as a whole in a state where the grindstone 21 is pressed against the inner surface of the cylinder bore 11 by a predetermined pressing pressure (expansion pressure) by the taper cone 17 and the shoe 19. The honing process is performed while moving up and down while rotating.

Cylinder block 9 and honing head 1
3, a guide member 21 provided on the main body side of the honing apparatus is disposed.
Has a guide hole 21 a for guiding the honing head 13 into the cylinder bore 11.

On the processing table 10 in the cylinder block 9, a coolant nozzle 23 is installed as a coolant discharge port for injecting and supplying coolant as a coolant to the inner surface of the cylinder bore 11. Coolant nozzle 2
The coolant injected from 3 is the water jacket 1
It shall not reach the upper opening of zero. To the coolant nozzle 23, the other end of a supply pipe 27, one end of which is connected to a coolant supply device 25 as a coolant supply means, is connected. The coolant supply device 25 is provided with a collection pipe 29 for collecting coolant discharged from the coolant nozzle 23.
Is connected, the coolant collected in the collection pipe 29 is controlled at a predetermined temperature, and the supply pipe 2 is controlled by a built-in pump.
7 The coolant supply unit 25 is provided with the operation unit 3
The operation from 1 starts and stops the operation separately from the operation of the honing machine.

According to the honing apparatus described above, when the honing apparatus is operated by the honing head 13 to perform honing on the inner surface of the cylinder bore 11, the coolant supply device 25 is also operated by operating the operating section 31. . Thereby, the coolant nozzle 23
The honing head 13 rotates and moves up and down in a state where the coolant is supplied to the inner surface of the cylinder bore 11 from above.

In such honing, while the honing apparatus itself is operating, the supply of coolant is continued, and as shown in FIG. Changes continuously following room temperature. Here, even if the honing head 13 is replaced or the honing machine is stopped due to some trouble on the production line before and after the honing process, the coolant supply device 25 is connected to the honing machine. Since it is operating separately, the supply of coolant is continued during this time. Therefore, even if the honing device is stopped as described above, the continuous change of the inner diameter of the cylinder bore 11 following the room temperature is maintained, and the correction value for the target inner diameter value is set based on the room temperature. , And the processing accuracy is maintained as desired.

At this time, the coolant is supplied from the coolant nozzle 23 installed below the cylinder block 9 toward the cylinder bore 11, and the coolant is supplied to the cylinder block 9.
The coolant does not reach the upper end of the water jacket 10, so that the coolant does not enter the water jacket 10, the coolant is prevented from being taken out to a subsequent process after the honing process, and the consumption of the coolant is reduced.

By preventing the coolant from being taken out to the subsequent process, it is possible to prevent the oil-based coolant usually used for honing from being mixed with the water-soluble coolant usually used in the subsequent process, for example, the finishing process. In addition, performance degradation and deterioration of the water-soluble coolant are prevented.

FIG. 2 is a schematic structural view of a honing apparatus showing another embodiment of the present invention. In this embodiment, a guide member 33 disposed between the cylinder block 9 and the honing head 13 is provided with a coolant discharge port 35a as a coolant discharge port instead of the coolant nozzle 23 in the embodiment of FIG. Coolant passage 3
5 are formed.

The guide member 33 includes the honing head 13
And a guide hole 33a as a through-hole for guiding the coolant into the cylinder bore 11, the coolant discharge port 35a is provided in the guide hole 33a, and it is possible to cope with the cylinder block 9 having three cylinder bores 11. Has become. In other words, three guide holes 33a are provided as shown in FIG. 3, which is a cross-sectional view taken along the line BB of FIG.
The guide hole 33a has a diameter substantially equal to or slightly larger than that of the cylinder bore 11 and an inner peripheral edge portion of the water jacket 10a.
It is formed so as to be located further inside.

The guide member 33 includes a pair of arms 3.
An operating rod 39 of a hydraulic cylinder 37 fixed to the main body side of the honing apparatus is mounted on the upper end of the arm 36. The guide member 33 is moved by the operation of the hydraulic cylinder 37 as shown in FIG.
It can be moved up and down in the inside, and is kept in close contact with the upper surface of the cylinder block 9 during honing. As a result, during honing, the bottom surface of the guide member 33 blocks the upper opening of the water jacket 10 of the cylinder block 9.

In the honing apparatus of FIG. 2 as well, the coolant supply unit 25 can continuously supply the coolant even when the honing apparatus is stopped. As in the embodiment of FIG. The continuous change between the cylinder blocks 9 following the room temperature of the inner diameter of 11 is maintained, and a correction value for the target inner diameter value can be fed back to the honing machine based on the room temperature. Maintained as desired.

In this embodiment, although the coolant is supplied from above the cylinder block 9,
Since the water jacket 10 is closed by the bottom surface of the guide member 33, the flow of the coolant into the water jacket 10 is avoided, and the mixing of the oil-based coolant into the water-soluble coolant in a later process is prevented.

[0033]

As described above, according to the first or fourth aspect, even when the operation of the honing apparatus is stopped, the supply of the cooling liquid to the inner surface of the processing hole is continued. As a result, the coolant is supplied to the work after the stop as well as the work being processed before the stop, the work is kept thermally stable before and after the equipment is stopped, and the error of the bore diameter changes even at room temperature. The correction value for the target inner diameter value can be fed back to the honing apparatus based on the room temperature, and the processing accuracy can be improved.

According to the second or fifth aspect, the coolant is supplied from the outer peripheral portion of the cylinder bore from the side opposite to the opening of the water jacket, so that the supplied coolant is prevented from flowing into the water jacket. It is possible to prevent the cooling liquid from being taken out to a later process.

According to the third or sixth aspect of the present invention, even if the coolant is supplied from the opening side of the opening that opens in the same direction as the direction in which the honing head is inserted, the opening is closed. Therefore, it is possible to prevent the coolant from flowing into the opening hole, and to prevent the coolant from being taken out to a subsequent process.

According to the seventh aspect of the present invention, even if the coolant is discharged from the coolant discharge port located in the same direction as the direction in which the honing head is inserted, the opening is closed. The inflow of the cooling liquid is avoided, and it is possible to prevent the cooling liquid from being taken out to a subsequent process.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a honing apparatus showing one embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a honing apparatus showing another embodiment of the present invention.

FIG. 3 is a sectional view taken along the line BB of FIG. 2;

FIG. 4 is a schematic configuration diagram of a horning apparatus showing a conventional example.

FIG. 5 is a diagram showing a temporal change characteristic of an error of a target inner diameter value of a cylinder bore with respect to a change in room temperature.

FIG. 6 is a change characteristic diagram of an error in the diameter of a cylinder bore including a state in which the honing apparatus is stopped and the supply of coolant is stopped.

[Explanation of symbols]

 9 Cylinder Block (Work) 10 Water Jacket (Opening Hole) 11 Cylinder Bore (Working Hole) 13 Honing Head 21 Grinding Stone 23 Coolant Nozzle (Cooling Fluid Discharge Port) 25 Coolant Feeder (Cooling Fluid Supply Means) 33 Guide Member (Closing Member) 33a Guide hole (through hole) 35a Coolant discharge port (coolant discharge port)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B24B 33/00-33/10 B24B 55/02 B23Q 11/10

Claims (7)

(57) [Claims] 1. A honing head for holding a grindstone pressed with a predetermined processing pressure against an inner surface of a processing hole of a work,
While receiving the supply of coolant while rotating and moving in the axial direction,
Based on the room temperature, a correction value for the target inner diameter value of the processing hole is fed back, and in a honing processing method of performing a grinding process on the inner surface of the processing hole, when a plurality of workpieces are continuously processed, A honing method comprising continuously supplying the cooling liquid even when the operation of the honing apparatus having the honing head is stopped during the continuous processing. 2. A work is a cylinder block, a processing hole is a cylinder bore of the cylinder block, and a water jacket is provided on an outer peripheral portion of the cylinder bore in the same direction as a honing head insertion side, and a honing process is performed on the cylinder bore. 2. The honing method according to claim 1, wherein the cooling liquid is supplied from the side opposite to the insertion direction of the honing head toward the inner surface of the cylinder bore. 3. When honing a workpiece having an opening formed in the outer peripheral portion of the processing hole in the same direction as the insertion side of the honing head, a honing head is supplied with a coolant while the opening is closed. 2. The honing method according to claim 1, wherein the feeding is performed in the same direction as the insertion direction of the honing. 4. A honing head for holding a grindstone pressed with a predetermined processing pressure against an inner surface of a processing hole of a work,
While receiving the supply of the coolant from the coolant supply means while rotating and moving in the axial direction, the correction value for the target inner diameter value of the machining hole is fed back based on the room temperature to grind the inner surface of the machining hole. In a honing machine that performs machining, the operation of the cooling liquid supply unit is performed continuously even when the operation of the machine is stopped during the continuous machining of a plurality of workpieces. Honing machine. 5. The workpiece is a cylinder block, the processing hole is a cylinder bore of the cylinder block, and the cylinder block has a water jacket that is opened in the outer peripheral portion of the cylinder bore in the same direction as the honing head insertion side. The coolant discharge port in the coolant supply means is
5. The honing apparatus according to claim 4, wherein the honing head is disposed toward the inner surface of the cylinder bore on a side opposite to a direction in which the honing head is inserted into the processing hole. 6. The work has an opening in the outer peripheral portion of the processing hole in the same direction as the insertion side of the honing head, and a closing member for closing the opening of the opening is disposed on the work. The honing apparatus according to claim 4, wherein 7. The cooling member according to claim 6, wherein the closing member has a through hole into which the honing head can be inserted, and a cooling liquid discharge port in the cooling liquid supply means is provided on an inner surface of the through hole. Honing equipment.