JP2003019655A - Honing method and honing apparatus for cylinder liner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform deglazing machining for obtaining required surface roughness efficiently in a short time by preventing the occurrence of clogging in a grinding wheel and dispensing with dressing. SOLUTION: The grinding wheel 10 is formed by integrally joining a roughing grinding wheel 10a having hard abrasive grains positioned at the leading side to the rotating direction of a honing head 11 and a finishing grinding wheel 10b positioned on the following side and formed of hard resin without abrasive grains. The grinding wheel 10 is mounted on four grinding wheel holders 15 fitted to the periphery of the honing head 11 with a clamper. While the honing head 11 is rotated and moved in the axial direction of a cylinder liner 2 by an operating device 17, sharp crest parts of crests and valleys created on the inner peripheral surface 2a of the cylinder liner 2 by deglazing machining using the roughening grinding wheel 10a at the leading side are favorably flattened to be equalized by the finishing grinding wheel 10b at the trailing side. Thus, the inner peripheral surface 2a with a required surface roughness can be obtained in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a honing method and a honing device for degrading (sharpening) the inner peripheral surface of a cylinder liner of an internal combustion engine.

[0002]

2. Description of the Related Art In recent years, in an internal combustion engine, particularly a diesel engine, a material having a high hardness has been adopted for a cylinder liner in order to cope with a severe use condition accompanying the increase in output. By the way, the cylinder liner corrects the inner peripheral surface that is unevenly worn due to use to a perfect circle or a state close to it during regular inspections and repairs, and also deglazing the inner peripheral surface that is mirror-finished and deteriorates oil retention. Honing is performed to improve the oil retention by applying.

Conventionally, in the honing of the cylinder liner, a metal bond grindstone has been used in view of the high hardness material of the cylinder liner, but the clogging is severe and dressing of the grindstone is required during the honing process. There is a problem that the glazing process takes a long time. Therefore, in order to solve this problem, (1) using a segment type grindstone in which two kinds of high hardness grindstone parts are located in front of and behind the rotating direction of the honing head to integrate the inner peripheral surface of the cylinder liner A method of honing in one stroke (Patent No. 2884048), (2) A cylinder liner using a grindstone in which a roughing grindstone and a finishing grindstone made of a plastic filament containing an abrasive are alternately arranged around a honing head. Method for honing the inner peripheral surface of a machine in two steps of roughing and finishing (Japanese Patent Laid-Open No. 6-155)
No. 282) has been proposed.

[0004]

However, in the former case, if a grindstone that easily falls is used as the grindstone preceding the grindstone in the rotating direction of the grindstone, the grindstone followed by the fallen grind will cause It may be pushed into the peripheral surface, and the abrasive grains embedded in the piston ring or the piston may damage the piston ring in the stroke direction of the piston, causing problems such as running out of the lubricating oil film and deterioration of the sealing performance of the piston ring.

Further, in the latter case, since the gap between the preceding roughing grindstone and the subsequent finishing grindstone is wide in the rotational direction of the grindstone, the grindstone moves in the axial direction of the cylinder liner during honing. When rotating while rotating, the rotation phase shifts significantly, so if the peaks of the valleys created by deglazing are not averaged, or at the end of honing, the roughing grindstone preceding and finishing grindstone There is a problem that the portion between them remains without being averaged by the finishing grindstone. Furthermore, in addition to the deglazing process with the preceding roughing grindstone, the degrading process with the polishing agent of the subsequent finishing grindstone is performed, so the peaks and valleys produced by the degrading process of the preceding roughing grindstone are average. There is also a problem that it is not processed.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to efficiently perform deglazing processing in a short time without causing dressing without causing clogging of a grindstone and to obtain a required surface roughness. It is an object of the present invention to provide a honing method and a honing device for a cylinder liner that can obtain the inner peripheral surface of the.

[0007]

The present invention is characterized by the following points in order to solve the above problems. That is,
A honing method for a cylinder liner according to claim 1,
A plurality of grindstones mounted around the honing head are pressed against the inner peripheral surface of the cylinder liner, and the honing head is rotated in the circumferential direction of the cylinder liner and moved in the axial direction, so that the inner peripheral surface of the cylinder liner is rotated. In the honing method of a cylinder liner for deglazing, the grindstone is a rough-grinding grindstone formed by fixing hard abrasive grains located on the leading side with respect to the rotating direction of the honing head, and the abrasive grain located on the trailing side. It is characterized in that it is integrally joined with a finishing grindstone made of a hard resin having no.

In the above cylinder liner honing method, roughening grindstones located on the leading side with respect to the direction of rotation of the honing head form peaks and valleys on the inner peripheral surface of the cylinder liner by deglazing, and immediately thereafter, Since the finishing grindstone made of hard resin on the trailing side moves in a state of being pressed against the inner peripheral surface of the cylinder liner, the sharp crest portion generated in the deglazing process is well averaged by the hard resin. It

At this time, the abrasive grains that have fallen off from the rough-working grindstone on the leading side and the grinding dust of the cylinder liner enter between the hard resin of the finishing grindstone on the trailing side and the inner peripheral surface of the cylinder liner to cause free grinding. The polishing action as particles is added, and the above-mentioned averaging action is more favorably performed. Therefore, according to the honing method for the cylinder liner, the inner peripheral surface of the cylinder liner having the required surface roughness can be reliably repaired. Also, the rough grinding wheel on the leading side is thinned by the thickness of the grinding wheel of the finishing grinding stone on the trailing side, and the abrasive grains are likely to fall off, so that clogging does not occur and dressing of the rough processing grinding stone during honing It becomes unnecessary.

A honing method for a cylinder liner according to a second aspect of the present invention comprises rotating a honing head in the circumferential direction of the cylinder liner with a plurality of grindstones mounted around the honing head being pressed against the inner peripheral surface of the cylinder liner. In the honing method of the cylinder liner that is moved in the axial direction and is degrading the inner peripheral surface of the cylinder liner, the grindstone is a rough processing grindstone formed by fixing hard abrasive grains and a hard resin having no abrasive grains. The finishing grindstones made of are alternately arranged at predetermined intervals in the circumferential direction of the honing head.

In this cylinder liner honing method, when the honing head is rotated and ridges and valleys are created on the inner peripheral surface of the cylinder liner by the deglazing process using the roughing grindstone, a finishing grindstone made of hard resin is then formed on the cylinder liner. The sharp crest portion generated in the deglazing process is well leveled and averaged by the hard resin, since it moves while being pressed against the inner peripheral surface.
An effect similar to that of the invention described in (1) can be obtained.

A honing method for a cylinder liner according to a third aspect is the honing method according to the first or second aspect, characterized in that a grinding fluid is supplied to a deglazing portion of the inner peripheral surface of the cylinder liner of the grindstone. To do. In the honing method for this cylinder liner, the grinding fluid sprinkled on the deglazing portion allows the abrasive grains and cylinder liner grinding chips that have fallen off the rough grinding stone to be easily washed away from the inner peripheral surface of the cylinder liner.
Along with the fact that the finishing grindstone is made of hard resin, there is no problem that the falling abrasive grains are embedded in the inner peripheral surface of the cylinder liner or the inner peripheral surface of the cylinder is damaged by the falling abrasive grains.

According to a fourth aspect of the present invention, there is provided a honing device for a cylinder liner, comprising a honing head having a plurality of grindstones mounted on its periphery, a supporting member for supporting the honig head and installing the honing head at a machining position of the cylinder liner, and the grindstone. An operating device for rotating the honing head in the circumferential direction of the cylinder liner and axially moving it while being pressed against the inner peripheral surface of the cylinder liner, and being pressed against the inner peripheral surface of the cylinder liner by the operating device. In a honing device for a cylinder liner for degrading the inner peripheral surface of a cylinder liner by moving the grindstone in the circumferential direction and the axial direction of the cylinder liner, each grindstone is a leading side with respect to the rotation direction of the honing head. Roughing grindstone made by fixing hard abrasive grains located at A finishing grinding wheel made of no hard resin and is characterized in that it is joined together.

In this honing device for a cylinder liner, the honing head is rotated and the cylinder liner is moved in the axial direction by the operating device, and deglazing is performed by the roughing grindstone located on the leading side in the rotational direction of the honing head. The sharp crests of the crests and troughs formed on the inner peripheral surface of the cylinder liner during the machining are, immediately thereafter, favorably leveled and averaged by a finishing grindstone made of a hard resin on the trailing side. With this cylinder liner honing device,
The inner peripheral surface of the cylinder liner with the required surface roughness can be reliably repaired, the roughing grindstone on the leading side does not become clogged, and the dressing of the roughing grindstone during honing is unnecessary, and the honing time is reduced. There is provided a honing device capable of significantly shortening

According to a fifth aspect of the present invention, there is provided a honing device for a cylinder liner, comprising a honing head having a plurality of grindstones mounted on its periphery, a supporting member for supporting the honig head and installing the honing head at a machining position of the cylinder liner, and the grindstone. An operating device for rotating the honing head in the circumferential direction of the cylinder liner and axially moving it while being pressed against the inner peripheral surface of the cylinder liner, and being pressed against the inner peripheral surface of the cylinder liner by the operating device. In a honing device for a cylinder liner for degrading the inner peripheral surface of a cylinder liner by moving the grindstone in the circumferential direction and the axial direction of the cylinder liner, the grindstone includes a grindstone formed by fixing hard abrasive grains and a grindstone. A grindstone made of hard resin that does not have particles, and a predetermined interval around the honing head. Only, characterized in that it is arranged alternately.

In this honing device for a cylinder liner, the honing head is rotated and the cylinder liner is moved in the axial direction by an operating device, and the honing head is subjected to deglazing with a roughing grindstone. Since the sharp peaks of the ridges and valleys created in 1 above are satisfactorily leveled by a finishing grindstone made of a hard resin and averaged, a honing device that operates almost in the same manner as the invention according to claim 5 is provided.

A honing device for a cylinder liner according to a sixth aspect of the present invention is the honing device according to the fourth or fifth aspect, wherein a plurality of grindstones are provided at predetermined intervals in the axial direction of the honing head. It is characterized by. In this honing device for the cylinder liner, loose abrasive grains such as falling abrasive grains and grinding debris from the rough-worked grindstone produced by honing the cylinder liner are easily washed away from the slits of the grindstone by the grinding liquid, and the free grindstone is removed. Excessive grinding action and increase in grinding resistance due to grains are prevented.

A honing device for a cylinder liner according to claim 7 is the honing device according to any one of claims 4 to 6, wherein the finishing grindstone is formed of a phenol resin having a hardness of 100 to 115 on a Rockwell M scale. It is characterized by In this cylinder liner honing device, loose abrasive grains formed from the rough-finished grindstone or grinding dust on the inner peripheral surface of the cylinder liner are appropriately supplemented to the hard resin of the finishing grindstone to remove the debris from the cylinder liner. The peaks in the peaks and valleys formed by glazing are satisfactorily satisfactorily polished and averaged by the action of the free abrasive grains, and the free abrasive grains are embedded in the inner peripheral surface of the cylinder liner or damaged. Does not cause a problem.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a honing device for a cylinder liner according to the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 is a cylinder liner 2 for repairing an internal combustion engine such as a diesel engine.
It is a honing device that is used by being mounted on the erection stand 3 on which is installed. The honing device 1 includes a pair of parallel columns 5 and 5 having upper ends connected by a yoke 4, and a guide member 6 that is vertically moved (moves in the axial direction of the column 4) by being guided by the columns 5 and 5. A grindstone rotating device 8 attached to the guide member 6 and suspended from the other end (lower end) of an air cylinder 7 supported at one end (upper end) by the yoke 4, and rotated by the grindstone rotating device 8. The honing head 11 is connected to the drive shaft 9 and has a plurality of grindstones 10 on the outer periphery thereof, and an oiling device 13 supported by the drive shaft 9 and having a spray nozzle 12 at the bottom.

Fixing members 5a and 5a are fixed to the lower ends of the columns 5 and 5, respectively.
Is inserted into a mounting hole provided on the upper surface of the temporary mount 3 to be fixedly installed on the temporary mount 3 in a state parallel to the axis of the cylinder liner 2. The length of the yoke 4 and the guide member 6 can be expanded and contracted, and the distance between the columns 5 and 5 can be adjusted according to the diameter of the cylinder liner 2. .

The honing head 11 has the drive shaft 9
Has a head main body 11a detachably connected to the end (lower end) of the head main body 11a via a clutch ring 14, and a cylindrical support arm 11b extending in the radial direction is provided on the outer peripheral portion of the head main body 11a. , The upper and lower two form a pair, and four pairs are fixed at equal intervals in the circumferential direction of the head body 11a. A grindstone holder 15 is provided at the outer ends of the pair of upper and lower arms 15a, 15a which are inserted and supported by the pair of support arms 11b, 11b and are movable in the axial direction. It is fixed so that it is parallel to. A recess 15b is formed on the outer surface of the grindstone holder 15, and the grindstone 10 is fitted into the recess 15b and fixed by a bolt 16a via a clamper 16.

Each of the arms 15a can be adjusted in the axial direction by operating a handle 8a provided on the grindstone rotating device 8 through an arm expansion / contraction adjusting mechanism (not shown). Further, by operating the adjusting bolt 8c of the tension adjusting mechanism 8b provided in the grindstone rotating device 8, each arm 15a is pressed outward by the spring force, and the honing head of the grindstone 10 fixed to the grindstone holder 15 is operated. The urging force of 11 on the outside in the radial direction can be adjusted.

The air cylinder 7, the grindstone rotating device 8, the arm expansion / contraction adjusting mechanism, the tension adjusting mechanism 8b and the like constitute an operating device 17 for the honing head 11. In addition, a washing oil receiving can 18 is provided on the floor surface inside the temporary mount 3.
Is installed and collects the grinding fluid that has been lubricated in the deglazing portion of the cylinder liner 2 and sucks the grinding fluid through the filter 19 with the oil feed pump 20 to supply the hose 21.
It is adapted to be transferred to the lubricator 13 via the.

Next, as shown in FIGS. 3 to 5, the grindstone 10 is a rough-processed grindstone 10 formed by fixing hard abrasive grains located on the leading side in the rotation direction a of the honing head 11.
and a finishing grindstone 10b made of a hard resin having no abrasive grains, which is located on the trailing side of the rotation direction a, are integrally joined to each other to form a segment structure. Further, in the grindstone 10, a plurality of rough-worked grindstones 10a and a finish grindstone 10b are arranged in series in the axial direction with slits 22 having a predetermined gap at the same position in the axial direction of the honing head 11.

The roughening grindstone 10a has a grain size of 30 to 20.
0 (JIS, B4130 standard) diamond abrasive grains,
CBN abrasive grain and grain size 30-220 (JIS, R6001
Hard abrasive grains such as WA abrasive grains and GC abrasive grains according to the above standard) are fixed by metal bond, vitrified bond, resin bond, electrodeposition, etc. to form a plate shape. The grain size of the abrasive grains and the fixing method thereof are not limited to the above.

The finishing grindstone 10b is a phenol resin,
Hardness of epoxy resin is 90 on Rockwell M scale
A plate-shaped hard resin having a size of 120 to 120, preferably 100 to 115 can be used. When the hardness of the hard resin is smaller than the above range, loose abrasive grains generated by degrading (sharpening) the inner peripheral surface 2a of the cylinder liner 2 by the roughing grindstone 10a are buried in the resin as described later. As a result, the peak portions in the peaks and valleys formed by the deglazing process are not sufficiently satisfactorily polished and averaged by the action of the loose abrasive grains.

When the hardness of the hard resin is larger than the above range, the free abrasive grains are not captured by the resin to a proper depth, and the peak portions cannot be averaged. As a result of pressing the loose abrasive grains on the inner peripheral surface 2a of the, the free abrasive grains are embedded in the inner peripheral surface 2a,
It is not preferable because it causes damage. The roughening grindstone 10a and the finishing grindstone 10b are integrally joined to each other at their facing plate surfaces with an adhesive such as an epoxy adhesive, and the outer peripheral surface 10c is at the center of the honing head 11 (of the drive shaft 9). (Center) is set along the same circumference with the center.

Next, the operation of the honing device 1 having the above-described structure and the honing method for deglazing the inner peripheral surface 2a of the cylinder liner 2 using the honing device 1 will be described. First, the cylinder liner 2 is removed from the diesel engine to be repaired, the cylinder portion of the cylinder liner 2 is inserted into the central hole 3a of the temporary mount 3, and the flange portion is fixed to the upper surface of the temporary mount 3. . Then, the honing device 1 is fixedly installed on the temporary mount 3 by inserting the fixing members 5a, 5a of the columns 5, 5 into the mounting holes provided on the upper surface of the temporary mount 3. At this time, the axis of the cylinder liner 2 and the axis of the honing head 11 are aligned.

After that, the air cylinder 7 is operated to lower the grindstone rotating device 8 retracted to the upper position, so that the honing head 11 is inserted into the cylinder liner 2 and positioned at the honing start position. . Next, by operating the handle 8a of the grindstone rotating device 8, the arms 15a, 1 of the honing head 11 in the contracted state are moved through the arm expansion / contraction adjusting mechanism (not shown).
5a is extended, the outer peripheral surface 2c of the grindstone 10 fixed to the grindstone holder 15 is brought into contact with the inner peripheral surface 2a of the cylinder liner 2, and the adjusting bolt 8c of the tension adjusting mechanism 8b is operated, whereby The contact pressure (surface pressure) on the inner peripheral surface 2a of the cylinder liner 2 is appropriately adjusted.

When the preparation is completed, the honing head 11 is lowered by the extension operation of the air cylinder 7 while the honing head 11 is rotated through the drive shaft 9 by the operation of the grindstone rotating device 8, and the cylinder by the grindstone 10 is moved. Honing of the inner peripheral surface 2a of the liner 2 is performed. When the honing head 11 reaches the lower end of the cylinder liner 2, this time, the air cylinder 7 is contracted and the honing head 11 is moved.
Raise and perform honing in the same manner. As for the rotation speed and the vertical movement speed of the honing head 11, the angle of the setting mark formed on the inner peripheral surface 2a of the cylinder liner 2 by the deglazing process by honing is within a predetermined angular range (30
To 60 °).

During this honing, the grinding fluid in the lubricator 13 is always sprayed through the nozzle 12 to the deglazing portion of the inner peripheral surface 2a of the cylinder liner 2. The grinding liquid dropped into the washing oil receiving can 18 together with the grinding dust by this spraying is filtered, and then the hose 2 is fed by the oil feeding pump 20.
1 is collected again in the lubricator 13 and reused. During the honing, the grindstone rotating device 8 is moved by the guide member 6 along the columns 5 and 5, and the honing head 11 moves up and down with its axis aligned with the axis of the cylinder liner 2. Therefore, even if the cylinder liner 2 is eccentrically worn, its inner peripheral surface 2a is finished to be a perfect circle.

As described above, the honing head 11 is driven by the operating device 17 such as the grindstone rotating device 8 and the air cylinder 7.
Is rotated and moves in the axial direction of the cylinder liner 2, and when the grindstone 10 of the honing head 11 performs deglazing processing on the inner peripheral surface 2a of the cylinder liner 2, it precedes the rotational direction of the honing head 1. The rough grinding wheel 10a located on the side of the cylinder liner 2 creates ridges and valleys on the inner peripheral surface 2a of the cylinder liner 2 by deglazing. Immediately after that, a finish made of hard resin without abrasive grains located on the trailing side. Since the grindstone 10b moves in a state of being appropriately pressed against the inner peripheral surface 2a of the cylinder liner 11, the sharp crest portion generated in the deglazing process is well leveled by the hard resin and averaged. An inner peripheral surface 2a having a surface roughness is obtained.

The honing of the cylinder liner 2 causes the abrasive grains that have fallen off the rough-working grindstone 10a on the leading side, and the cylinder liner 2 removed by these abrasive grains.
Grinding debris enters between the hard resin of the finishing grindstone 10b on the trailing side and the inner peripheral surface 2a of the cylinder liner 2 to act as free abrasive grains, and the mountain portion generated by the deglazing process is polished, The averaging is performed better. Further, since the finishing grindstone 10b on the trailing side is a hard resin having no abrasive grains and has a hardness lower than that of the inner peripheral surface 2a of the cylinder liner 2, the abrasive grains that have fallen off from the roughing grindstone 10a on the leading side are hard resin. The inner peripheral surface 2a of the cylinder liner 2 is pressed against the inner peripheral surface 2a of the cylinder liner 2 and the inner peripheral surface 2a of the cylinder liner 2 is not damaged or is easily washed away from the inner peripheral surface 2a of the cylinder liner 2 by the grinding liquid. .

The rough-working grindstone 10a on the leading side is thinned by the thickness of the grindstone of the finishing grindstone 10b on the trailing side, and the abrasive grains easily fall off, so that the rough-working grindstone during honing does not occur. The dressing of 10a is unnecessary. As a result, the honing time is shortened by the time conventionally required for dressing a grindstone, and the time for repairing the cylinder liner 2 by honing can be greatly shortened.

Incidentally, the honing device 1 of the above-mentioned embodiment
In the first embodiment, the grindstone 10 of the honing head 11 is configured by integrally joining the leading-side rough-working grindstone 10a and the trailing-side finishing grindstone 10b made of hard resin to each other, to form the grindstone holder 15
Since it is fixed to the above, it is preferable that the averaging action of the crests of the ridges and valleys generated by the deglazing process is performed extremely well, but not limited to this, the roughing grindstone 10a and the finishing grindstone 10b made of hard resin are used as the honing head. It may be fixed to each grindstone holder 15 with a slight distance in the front-rear direction with respect to the rotation direction of 11.

Further, as shown in FIG. 6, the roughing grindstone 10a and the finishing grindstone 10b made of a hard resin are not joined together, but are supported by the support arm 11b of the honing head 11 to surround the honing head 11. The rough-working grindstones 10a and the finishing grindstones 10b made of hard resin may be alternately attached to the plurality of grindstone holders 15 arranged at predetermined intervals in the direction. Further, although an example in which four grindstones 10 are provided around the honing head 11 has been shown, the number of grindstones 10 provided around the honing head 11 is not limited to four and may be any other number.

Further, in the honing device 1 of the above-mentioned embodiment, the roughing grindstone 10a in the grindstone 10 and the finishing grindstone 10b made of hard resin are provided with slits 22 at predetermined intervals in the axial direction of the honing head 11. Since a plurality of them are arranged in series, loose abrasive grains such as lost abrasive grains and grinding debris generated by honing the cylinder liner 2 are easily washed away from the slit 22 by the grinding liquid, and the excess abrasive grains cause the excess abrasive grains. It is preferable that a large grinding action and an increase in grinding resistance are prevented, but not limited to this, the roughing grindstone 10a and the finishing grindstone 10b made of a hard resin are
The honing heads 11 may be formed as one piece that is continuous in the axial direction.

In the cylinder liner honing method of the above-described embodiment, the cylinder liner 2 is removed from the internal combustion engine and fixed to the temporary mount 3, and the honing device 1 is installed on the temporary mount 3 to perform honing. However, instead of this, a stud bolt or the like for fixing the cylinder head fixed to the upper surface of the cylinder column of the internal combustion engine is used, and the stanchions 5, 5 of the honing device 1 are attached to the stud. The cylinder liner 2 may be inserted and supported, and the cylinder liner 2 may be honed by the honing device 1 while the cylinder liner 2 is still attached to the internal combustion engine. In this way, the cylinder liner 2 does not have to be removed from the internal combustion engine, so that honing can be performed efficiently.

[0039]

As described above, the present invention has the following excellent effects. According to the honing method for a cylinder liner according to claim 1 and claim 2, the inner peripheral surface of the cylinder liner, which is degraded with a roughing grindstone having hard abrasive grains fixed thereto, is made of a hard resin having no abrasive grains. Since it is averaged with a finishing grindstone, it is possible to reliably repair the inner peripheral surface of the cylinder liner with the required surface roughness, and the roughening grindstone easily clogs because its abrasive grains easily fall off. Since there is no need to dress the rough-processed grindstone during honing, at least the amount of time that was conventionally required for dressing the grindstone,
Honing time can be shortened, and the time for deglazing and repairing the cylinder liner by honing can be greatly shortened.

According to the honing method of the cylinder liner of the third aspect, the grinding fluid sprinkled on the deglazing portion causes the abrasive grains that have fallen off the rough grinding wheel and the grinding debris of the cylinder liner to move to the inner circumference of the cylinder liner. Since it is easily washed off from the surface, in combination with the fact that the finishing grindstone is a hard resin, falling abrasive grains are embedded in the inner peripheral surface of the cylinder liner, or the inner peripheral surface of the cylinder is damaged by the falling abrasive particles. It is possible to reliably prevent the occurrence of such a trouble.

According to the honing device for a cylinder liner of the fourth and fifth aspects, the inner peripheral surface of the cylinder liner having a required surface roughness can be reliably repaired by deglazing. It is possible to provide a honing device that does not cause clogging of a rough-working grindstone, does not require dressing of the rough-working grindstone during honing, and can significantly reduce the honing time.

According to the honing device for a cylinder liner of the sixth aspect, loose abrasive grains such as falling abrasive grains and grinding debris from the rough-finished grindstone produced by honing the cylinder liner are ground from the slits of each of the grindstones. It becomes easy to wash away with the liquid, and it is possible to prevent excessive or irregular grinding action of the inner peripheral surface of the cylinder liner due to the loose abrasive grains and increase in grinding resistance.

According to the honing device for a cylinder liner of the seventh aspect, since the finishing grindstone having no abrasive grains is made of a hard resin having an appropriately set hardness, it is possible to remove the abrasive grains falling from the rough-processed grindstone. Free abrasive grains consisting of grinding dust, etc. on the inner peripheral surface of the cylinder liner are appropriately supplemented to the hard resin of the finishing grindstone, and the mountain portion in the mountain valley portion formed by the deglazing process of the cylinder liner is the free abrasive. The effect of polishing and averaging by the action of the grains is performed well, and this allows the inner peripheral surface of the cylinder liner to be accurately measured without causing defects such as embedding free abrasive grains or causing damage. It can be finished by glazing.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a honing device for a cylinder liner according to the present invention.

FIG. 2 is a view on arrow EE of FIG.

FIG. 3 is an enlarged view of an X portion of FIG.

FIG. 4 is a view on arrow B of FIG.

5 is a view on arrow C of FIG.

FIG. 6 is a plan view showing another example of the honing head.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Honing device 2 Cylinder liner 2a Inner peripheral surface 3 Temporary mount 4 Yoke 5 Strut 6 Guide part 7 Air cylinder 8 Grinding wheel rotating device 9 Drive shaft 10 Grinding wheel 10a Roughing grindstone 10b Finishing grindstone 11 Honing head 13 Lubricator 15 Grindstone holder 15a Arm 16 Clamper 17 Actuator

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsuzo Iwasawa             1-10-1 Kamatahonmachi, Ota-ku, Tokyo Stock             Niigata Iron Works Motor Company F-term (reference) 3C058 AA02 AA09 AA18 BA07 CA02                       CB03 CB10

Claims (7)

[Claims] 1. A cylinder, wherein a plurality of grindstones mounted around a honing head are pressed against the inner peripheral surface of a cylinder liner, and the honing head is rotated in the circumferential direction of the cylinder liner and moved in the axial direction, In a honing method of a cylinder liner for degrading the inner peripheral surface of a liner, the grindstone is a rough grindstone formed by fixing hard abrasive grains located on the leading side with respect to the rotating direction of the honing head, and the trailing side. A honing method for a cylinder liner, characterized in that a finishing grindstone made of a hard resin having no abrasive grains located at is integrally joined. 2. A cylinder that rotates the honing head in the circumferential direction of the cylinder liner and moves in the axial direction with a plurality of grindstones mounted around the honing head pressed against the inner peripheral surface of the cylinder liner. In the honing method of a cylinder liner for degrading the inner peripheral surface of a liner, the grindstone is a roughing grindstone formed by fixing hard abrasive grains and a finishing grindstone made of a hard resin having no abrasive grains, of the honing head. A honing method for a cylinder liner, characterized in that they are alternately arranged at predetermined intervals in the circumferential direction. 3. The honing method for a cylinder liner according to claim 1, wherein the grinding liquid is supplied to a portion of the grindstone where the inner peripheral surface of the cylinder liner is subjected to a deglazing process. 4. A honing head having a plurality of grindstones mounted on the periphery thereof, a support member for supporting the honig head at a machining position of a cylinder liner, and a state in which the grindstone is pressed against an inner peripheral surface of the cylinder liner. And an operating device for rotating the honing head in the circumferential direction of the cylinder liner and moving it in the axial direction, and the grinding stone pressed against the inner peripheral surface of the cylinder liner by the operating device is set in the circumferential direction of the cylinder liner. In a honing device of a cylinder liner for degrading the inner peripheral surface of a cylinder liner by moving in the axial direction, each of the whetstones adheres hard abrasive grains located on the leading side with respect to the rotating direction of the honing head. With a rough grinding wheel
A honing device for a cylinder liner, which is integrally joined to a finishing grindstone made of hard resin having no abrasive grains located on the trailing side. 5. A honing head having a plurality of grindstones mounted on its periphery, a support member for supporting the honig head and installing it at a processing position of a cylinder liner, and a state in which the grindstone is pressed against an inner peripheral surface of the cylinder liner. And an operating device for rotating the honing head in the circumferential direction of the cylinder liner and moving it in the axial direction, and the grinding stone pressed against the inner peripheral surface of the cylinder liner by the operating device is set in the circumferential direction of the cylinder liner. In a cylinder liner honing device for degrading the inner peripheral surface of a cylinder liner by moving in the axial direction, the grindstone is made of a hard-working grindstone formed by fixing hard abrasive grains and a hard resin having no abrasive grains. The finishing grindstones are alternately arranged at predetermined intervals in the circumferential direction of the honing head. Honing device of the cylinder liner. 6. The honing device for a cylinder liner according to claim 4, wherein a plurality of the grindstones are provided with slits at predetermined intervals in the axial direction of the honing head. 7. The honing device for a cylinder liner according to claim 4, wherein the finishing grindstone is formed of a phenol resin having a hardness of 100 to 115 on a Rockwell M scale. .