JP6871075B2 - Honing machine and processing method using it - Google Patents

Description

The present invention relates to a honing machine for polishing an inner diameter surface by pressing a honing grindstone against an inner diameter surface of a hole of a work piece, and a processing method using the same.

Conventionally, a honing machine has been known in which a grindstone attached to a columnar spindle is pressed against an inner diameter surface of a hole of a work piece and reciprocates and rotates while applying a constant load to polish the inner diameter surface. The honing machine performs machining by centering the tool and the work on the tool side or the jig side and aligning them with the pre-machined holes. As a jig for centering, for example, a jig having a floating mechanism is known (see, for example, Patent Document 1).

Further, as a honing machine, for example, a small-diameter honing tool provided with a honing grindstone as in Patent Document 2 is known. This honing tool is reciprocated in the axial direction of the inner diameter surface of the hole to be machined with a small diameter (for example, within 20 mm in diameter) of the workpiece, and while rotating around the axis, the honing grindstone is given a cutting operation with a constant depth of cut. , The inner diameter surface of the hole to be machined is honing.

Japanese Patent No. 26099989 Japanese Unexamined Patent Publication No. 2006-346837

In a small-diameter honing tool as in Patent Document 2, since the grindstone expansion mechanism is provided in the small-diameter shaft at the tip of the tool, only one honing grindstone is provided in a part in the circumferential direction. In the case of a single grindstone, the load fluctuation due to the stroke causes the tool or work to tilt. Further, the load fluctuation in rotation increases the movement in the circumferential direction and causes the movement that impairs the perfect circular shape. Further, it leads to the occurrence of inclination, stable processing cannot be performed, and the finishing accuracy cannot be improved.

The present invention has been made in view of this point, and an object of the present invention is to improve machining accuracy without impairing the floating function of the jig.

In order to achieve the above object, in the present invention, a plurality of fluid discharge portions for discharging fluid from a predetermined position in the circumferential direction are provided with respect to the work holder or the inner rotating body of the jig having a floating function.

Specifically, in the first invention, a rotary spindle that can reciprocate in the axial direction of the inner diameter surface of the hole to be machined and can rotate around the axis, and a honing that is detachably attached to the tip of the rotary spindle. It is assumed that the honing machine is provided with a tool and a work holding jig that supports the work in a horizontally floating state with the work being oriented so that the hole to be machined extends in the vertical direction.

The honing tool is provided with at least one honing grindstone that can project and retract in the radial direction.
The work holding jig is
Jig base and
An outer rotating body that is rotatably supported about the first horizontal axis and movably supported along the first horizontal axis with respect to the jig base.
An inner rotating body that is supported so as to be rotatable about a second horizontal axis extending in a direction perpendicular to the first horizontal axis with respect to the outer rotating body and movably along the second horizontal axis.
A work holder that is fixed to the inner rotating body and that positions and holds the work in a removable manner.
A plurality of fluid discharge portions for discharging fluid from a predetermined position in the circumferential direction with respect to the work holder or the inner rotating body are provided so as to cancel the pressing force applied by the honing grindstone.

According to the above configuration, the fluid is discharged from a predetermined position in the circumferential direction to the work holder or the inner rotating body that holds the work from the plurality of fluid discharge portions, so that the pressing force applied by, for example, one honing grindstone during grinding is applied. Discharge pressure can be applied from the opposite side to counteract the force. Therefore, precise machining is possible by utilizing the floating function of the work holding jig.

In the second invention, in the first invention,
The plurality of fluid discharge portions are configured to discharge fluid from the opposite side of the honing grindstone in accordance with the rotation of the honing grindstone so as to cancel the pressing force applied by the honing grindstone.

According to the above configuration, for example, by applying a reaction force to a force in one direction by a single grindstone from the fluid discharge portion, the swing of the work holding jig can be suppressed, and the work holding jig can be suppressed. Precise processing is possible by taking advantage of the floating function.

In the third invention, in the first invention,
The plurality of fluid discharge portions are configured to be able to form a desired inner diameter surface shape by adjusting the pressure of the fluid in response to the pressing force applied by the honing grindstone.

According to the above configuration, if a force larger than the pressing force of the grindstone is supplied, a state of over-cutting is intentionally created, and conversely, a state of uncut portion is intentionally created by supplying a force smaller than the pressing force of the grindstone to create a perfect circle. It is also possible to make a desired inner diameter surface shape instead of the shape.

In the fourth invention, in any one of the first to third inventions,
The plurality of fluid discharge portions are provided at predetermined intervals on the work holder or the annular body provided around the inner rotating body.

According to the above configuration, since the fluid discharge portions may be provided on the annular body at predetermined intervals, a plurality of fluid discharge portions can be easily formed with a simple configuration.

In the fifth invention, in the fourth invention,
The annular body is fixed to the jig base.

According to the above configuration, the jig base can reliably receive the reaction force of the annular body.

In the sixth invention, in the fourth or fifth invention,
A pair of upper and lower annular bodies is provided.

According to the above configuration, by arranging the two stages up and down, an appropriate reaction force can be applied to the inner rotating body or the work holder in accordance with the vertical movement of the stroke.

In the seventh invention, in any one of the fourth to sixth inventions,
A connecting groove for communicating adjacent air outlets is formed on the peripheral edge of the air outlets of the plurality of fluid discharge portions on the inner diameter surface of the annular body.

According to the above configuration, rectification occurs by communicating the adjacent fluid discharge portions with each other through the connecting groove, so that the fluid is appropriately flowed into the adjacent outlet where the fluid is not discharged, and the fluid flows rapidly. Adverse effects are prevented.

In the eighth invention, in any one of the fourth to seventh inventions,
The plurality of fluid discharge portions are provided in multiples of 4.

According to the above configuration, the formation and control of the fluid discharge portion is easy, and the reaction force control becomes easy by increasing the number of the fluid discharge portions.

In the ninth invention, in any one of the first to eighth inventions,
The plurality of fluid discharge parts are composed of discharge parts for discharging high-pressure air.
It is configured to blow out in a direction that cancels the pressing force of the honing grindstone in accordance with the rotation of the honing grindstone.

According to the above configuration, the high-pressure air is clean without the need for recovery, and it is easy to perform precise control such as canceling the pressing force of the honing wheel.

In a tenth invention, a rotating spindle that can reciprocate in the axial direction of the inner diameter surface of a hole to be machined and can rotate around the axis, a honing tool that is detachably attached to the tip of the rotating spindle, and the work. Is premised on a machining method using a honing machine equipped with a work holding jig that supports the work in a horizontally floating state with the hole to be machined oriented so as to extend in the vertical direction.
The above processing method is
The honing tool is provided with at least one honing grindstone capable of projecting and retracting in the radial direction, and the work holding jig is rotatable about a jig base and a first horizontal axis with respect to the jig base. In addition, it can be rotated around an outer rotating body that is movably supported along the first horizontal axis and a second horizontal axis that extends in a direction perpendicular to the first horizontal axis with respect to the outer rotating body. Further, an inner rotating body that is movably supported along the second horizontal axis, a work holder that is fixed to the inner rotating body and that positions and holds the work in a removable manner, and a pressing force applied by the honing grindstone. A preparatory step of providing a plurality of fluid discharge portions for discharging fluid from a predetermined position in the circumferential direction with respect to the work holder or the inner rotating body so as to cancel out the above.
A calculation process for calculating the discharge pressure of the fluid that cancels the pressing force that presses the workpiece with the honing tool, and
The work mounting process for attaching the work to the work holder, and
While rotating the honing tool around the rotating spindle, the honing grindstone is reciprocated in the axial direction of the inner diameter surface of the hole to be machined of the work to press the honing grindstone against the inner diameter surface and cancel the pressing force by the honing grindstone. The configuration includes a grinding step of discharging the fluid from the corresponding one of the plurality of fluid discharge portions according to the position of the honing grindstone in the direction.

According to the above configuration, the fluid is discharged from a predetermined position in the circumferential direction to the work holder or the inner rotating body that holds the work from the plurality of fluid discharge portions, so that the pressing force applied by, for example, one honing grindstone is canceled. As such, the discharge pressure can be applied from the opposite side. Therefore, precise machining is possible by utilizing the floating function of the work holding jig.

As described above, according to the present invention, the jig is configured to discharge the fluid from the fluid discharge portion provided at a predetermined position in the circumferential direction with respect to the work holder holding the work or the inner rotating body. Machining accuracy can be improved without impairing the floating function.

FIG. 2 is a cross-sectional view taken along the line II of FIG. It is a perspective view which shows the state which the work is honing with the honing tool which concerns on embodiment of this invention. It is a perspective view which looked at the state which the workpiece is honing with the honing tool which concerns on embodiment of this invention from another direction. It is a perspective view which shows the inner ring body enlarged. It is a perspective view which shows the outer ring body enlarged. The graph explaining the valve control which concerns on embodiment of this invention is shown. The graph explaining the valve control which concerns on other Examples of this invention is shown. It is schematic cross-sectional view which shows the relationship between the honing tool and each machined surface when the honing tool moves to the upper end side. It is schematic cross-sectional view which shows the relationship between the honing tool and each machined surface when the honing tool moves to the lower end side.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show a state in which the work 50 is honing with the honing tool 1 of the honing machine according to the embodiment of the present invention. For example, the work 50 is a valve block of a hydraulic device. Although not shown in detail, the honing machine itself may have a known structure. For example, a rotatable and vertically reciprocating rotary spindle 2 to which the honing tool 1 is attached, and the rotary spindle 2 can be rotated and moved up and down. It is equipped with a driving means for reciprocating. The rotational speed, vertical reciprocating speed, depth of cut, and the like of the rotating spindle 2 can be precisely controlled by a control device (not shown).

As shown in FIG. 1, the honing tool 1 is configured to be reciprocated in the axial direction and rotatably inserted into the machined hole 51 of the work 50 in the axial direction, and protrudes and retracts in the radial direction. It is equipped with one possible honing wheel 6. Specifically, the honing grindstone 6 is built in the tip 4 of the tool body 3 whose tip side is narrowed, and the grindstone pressing pin (not shown) inserted through the internal through hole 5 is moved up and down to an appropriate height. By driving, the amount of protrusion in the radial direction is adjusted. For example, the tip 4 of the tool body 3 has a diameter of 20 mm or less, which is considerably smaller than a normal one. Further, as shown in FIG. 2 and the like, the grindstone position detection switch 7 is provided on the honing tool 1. The grindstone position detection switch 7 is composed of, for example, a proximity switch, detects the rotation angle of the honing tool 1 from the presence or absence of the protrusion 7a provided on the honing tool 1, and high-pressure air from the honing grindstone 6 and the air discharge portion 20 described later. It is possible to synchronize with the discharge timing of.

The honing machine includes a work holding jig 10 that supports the work 50. The work holding jig 10 is configured to be able to support the work 50 so that the work 50 floats in the horizontal direction in a state where the hole 51 to be machined is oriented so as to extend in the vertical direction. The work holding jig 10 includes a jig base 11 formed of a plurality of metal members. As shown in FIG. 3, the jig base 11 includes, for example, a bottom plate 11b having a lower opening 11a and a pair of first side plates 11c erected at opposite positions on the left and right sides of the bottom plate 11b. There is. The pair of first side plates 11c are connected to the second side plates 11d, respectively. As shown in FIG. 1, a horizontal first horizontal shaft 12 is rotatably provided in the same linear shape in the first bushes 12a provided at opposite positions on the upper side of the pair of first side plates 11c. .. The outer rotating body 13 is rotatably supported around the first horizontal shaft 12. The shape of the outer rotating body 13 is not particularly limited, but first through holes 13a through which the first horizontal shaft 12 is inserted are provided at positions facing each other of the annular main body. The tip end side of the first horizontal shaft 12 is inserted into the first through hole 13a in a state of being prevented from coming off by the first retaining pin 13c, and the outer rotating body 13 is paired with the first side plate 11c through the first horizontal shaft 12. It is supported with a gap between them. As a result, for example, by moving the outer rotating body 13 together with the first horizontal axis 12, it becomes possible to move horizontally along the first horizontal axis 12 by the amount of this gap, and it is possible to rotate around the first horizontal axis 12. It has become.

Further, a second through hole 13b is provided at a position shifted by 90 ° in the circumferential direction with respect to each first through hole 13a in the outer rotating body 13, and a second bush provided in the second through hole 13b. A second horizontal shaft 14 is rotatably and horizontally inserted through 12b. That is, the axial direction of the second horizontal axis 14 is perpendicular to the axial direction of the first horizontal axis 12 in a plan view. The tip end side of the second horizontal shaft 14 is inserted into, for example, an inner through hole 15a provided at a position facing the cylindrical inner rotating body 15 in a state of being prevented from coming off by a second retaining pin 15b. As a result, the inner rotating body 15 can rotate around the pair of second horizontal axes 14, and the second horizontal is equal to the gap between the outer peripheral surface of the inner rotating body 15 and the inner peripheral surface of the outer rotating body 13. It is supported so as to be horizontally movable along the shaft 14.

The cylindrical body of the inner rotating body 15 is provided with a work holder 16 that removably positions and holds the work 50. As a result, the work 50 is supported so as to be horizontally movable in two dimensions and swingable in three dimensions with respect to the jig base 11. The work holder 16 has a substantially cylindrical shape, and can be attached to and detached from the inner rotating body 15 with a mounting bolt 16a. If the mounting bolt 16a is removed and pulled up, the work 50 together with the work holder 16 can be removed from the inner rotating body 15. The lid member 16b may be removed and the work 50 alone may be removed from the work holder 16.

As a feature of this embodiment, the work holding jig 10 includes an air discharge unit 20 as a plurality of fluid discharge units that discharge fluid from a predetermined position thereof. Specifically, the plurality of air discharge portions 20 are composed of discharge portions for discharging high-pressure air, and are blown out in a direction that cancels the pressing force of the honing grindstone 6 in accordance with the rotation of the honing grindstone 6. It is configured. Hydraulic oil or the like can be considered as the fluid, but high-pressure air has the advantage of being clean and easy to control without the need for recovery.

The plurality of air discharge portions 20 are provided at predetermined intervals on the annular bodies 21, 22, 24, 25 provided around the work holder 16 or the inner rotating body 15. In this embodiment, the plurality of air discharge units 20 are provided, for example, eight on the upper side and eight on the lower side, for a total of 16. This number is not particularly limited, but it is desirable to provide a multiple of 4. The plurality of air discharge units 20 are configured to discharge the fluid from the opposite side of the honing grindstone 6 in accordance with the rotation of the honing grindstone 6 so as to cancel the pressing force applied by the honing grindstone 6. Specifically, two upper and lower annular bodies are provided on the outer circumference of the work holder 16, and by providing the annular bodies at equal intervals, a plurality of air discharge portions 20 can be easily formed.

The upper first outer annular body 21 and the first inner annular body 22 are connected to each other by, for example, press fitting. As shown in FIG. 4, the first inner annular body 22 has, for example, eight rectangular outlets 22a at equal intervals. The outlets 22a are connected to each other by, for example, three upper and lower connecting grooves 22b. A connecting groove 22b is formed on the peripheral edge of the outlets 22a of the plurality of air discharge portions 20 on the inner diameter surface of the first inner annular body 22 to communicate the adjacent outlets 22a with each other. As shown in FIG. 5, the first outer annular body 21 has a fixing screw 21a for fixing to the first side plate 11c of the jig base 11, and the air supply port 21b is equal to or equal to the air outlet 22a. Eight are provided at intervals. The air supply port 21b is provided with eight connector portions 23 for connecting air pipes.

The lower second outer annular body 24 and the second inner annular body 25 are also connected to each other in the same manner, and have the same configuration as those illustrated in FIGS. 4 and 5. The second outer annular body 24 is fixed to the second side plate 11d of the jig base 11.

By arranging the annular bodies in two upper and lower stages in this way, an appropriate reaction force is appropriately applied to the inner rotating body 15 or the work holder 16 from the opposite side of the honing grindstone 6 in accordance with the stroke vertical movement of the honing grindstone 6. You can do it. Then, by fixing the first outer annular body 21 and the second outer annular body 24 to the jig base 11, respectively, the reaction forces of the first outer annular body 21 and the second outer annular body 24 can be reliably received. It has become like.

Further, the size of the gap between the outlet 22a of the first inner annular body 22 and the inner rotating body 15 and the gap between the outlet 22a of the second inner annular body 25 and the outer circumference of the work holder 16 is preferably about 20 μm, respectively. .. If the gap is too small, the pressure will not be released well, and the residual pressure will remain even after switching and the inclination will change. On the other hand, if the gap is too wide, an appropriate reaction force cannot be generated.

-Processing method using a honing machine-
Next, a processing method using the honing processing machine according to the present embodiment will be described.

First, in the preparation step, the honing machine is prepared, and the honing tool 1 is attached to the tip of the rotary spindle 2. The honing tool 1 is provided with one honing grindstone 6 capable of projecting and retracting in the radial direction. Further, although not shown in detail, an air source is prepared so that high-pressure air can be sent to the air discharge portions 20 as a plurality of fluid discharge portions, and each air tube is piped to each connector portion 23 via an air valve.

Then or in advance, in the calculation step, the discharge pressure of the high-pressure air capable of canceling the pressing force for pressing the work W by the honing tool 1 is calculated (details will be described later).

Next, in the work mounting step, the work 50 is mounted on the work holder 16.

Next, in the grinding step, while rotating the honing tool 1 around the rotating spindle 2, the honing grindstone 6 is pressed against the inner diameter surface by reciprocating in the axial direction of the inner diameter surface of the hole 51 to be machined of the work W, and the honing grindstone is pressed. High-pressure air is discharged from the corresponding one of the plurality of air discharge portions 20 according to the position of the honing grindstone 6 in the direction of canceling the pressing force of 6. (Specific procedure will be described later).

-Example-
Next, the processing method using the honing processing machine described in the above embodiment will be described with reference to Examples.

The air discharge portions 20 were provided at eight locations at equal intervals in the circumferential direction above and below the center of the work, for a total of 16 locations. Control is performed to change the air blowing position in synchronization with the rotation of the honing grindstone 6. By this interlocking operation, a reaction force against the pressing force of the honing grindstone 6 is applied to the work holding jig 10.

For example, the size of the air outlet 22a is 23.5 mm in width and 15 mm in height when viewed from the side. Then, the area becomes 352.7 mm, and when high-pressure air of 20.367 MPa is supplied, a reaction force of 1.23 N can be generated. Then, a connecting groove 22b having a depth of 0.02 mm and a width of about 1 mm is provided on the peripheral edge of the outlet 22a.

Next, a specific method of controlling the supply of high-pressure air will be described.

First, the start point θ0 of the phase detection switch 7 is set on the spindle grindstone surface of the honing grindstone 6.

Then, the valves corresponding to the eight upper and eight lower outlets 22a are switched to sequentially distribute the air to each outlet 22a.

As an operation method, for example, when the rotation speed of the honing grindstone 6 is 200 rpm, the stroke speed is 2000 mm / min, and the vertical stroke distance is 10 mm, the operating method is 0.3 seconds / rev and 0.3 seconds / 10 mm. The blowing time at each outlet 22a is 0.0375 seconds.

Next, the control method will be described. First, the rotation is started from θ0, and at the same time, the vertical stroke movement is started from the center of the work to the upper side. Then, the rotation angle of the spindle grindstone surface is processed by using the detection signal from the grindstone position detection switch 7.

Next, the supply of high-pressure air is started from the outlet 22a of the first outlet P1 on the upper side in accordance with the position of the honing grindstone 6.

Next, the time of 1/8 rotation at a rotation speed of 200 rpm is 0.0375 seconds, and the pressure at this time interval is applied to the upper blowing portions P1 to P8. The discharge position is synchronized with the rotation of the honing grindstone 6, and the valve is switched in time units. The synchronization timing is adjusted using the rotation angle detected from the grindstone position detection switch 7.

Next, in a situation where the discharge of the upper blowing portions P1 to P8 is stopped, the vertical stroke of the honing grindstone 6 is moved below the vertical center. At this time, it is necessary to control the control valve switching and the discharge position switching. For example, it is necessary to utilize residual pressure or actively supply to the partition surface.

Next, at the same time as the start of movement of the honing grindstone 6 below the vertical center (0.3 seconds after the start of control), the air supply is switched to the lower blowout portions P10 to P16. In the case of the above conditions, after 0.3 seconds, one rotation is completed, so the supply is switched to the lower outlet P9.

Next, the air blowing position is switched to the lower blowing portions P9 to P16 in synchronization with the rotation of the honing grindstone 6 starting from the lower blowing portion P9.

Then, the upper and lower strokes are sequentially switched, and the above steps are carried out until the end of cutting to perform machining.

When the processing is completed, the work 50 is taken out and the next work 50 is processed.

-Discharge pressure calculation procedure-
An example of the discharge pressure calculation procedure in the above calculation step is shown. Here, the setting is made by calculating from the specific cutting resistance. First, the processing force F1 is obtained. The machining force F1 is obtained from the chip thickness (cutting speed / rotation speed) × length × width × ratio cutting resistance. For example, 0.03 / 210 × 27 × 2 × 0.24 = 0.00185 kgf (0.018N). In other words, it is a value that can be ignored because it is very small.

Next, the pressing force F2 is obtained. The force generated is estimated using the measured value of the notch shaft motor load during machining. For example, the measured value is 305N, and the component force of the 4 ° cone is Cos (4) × (305 / 9.8) = 31.046kgf (304.25N). The grindstone has three hooking ranges from the first machined surface 50a to the third machined surface 50c, and is considered as 1/3 force per surface. The force applied to the first machined surface 50a is 31.046 / 3 = 10.34 kgf (101.33N), and the force on each surface is + for convenience of analysis on the upper side and-on the lower side via the operating shaft. Notated as.

As shown in FIG. 8A, when the grindstone stroke is at the upper part, the A side is + 10.3 kgf, the B side is + 10.34 kgf, and the C side is -10.34 kgf, and + 10.34 kgf remains from the difference force. .. As shown in FIG. 8B, when the grindstone stroke is at the lower part, the B surface is + 10.34 kgf, the C surface is -10.34 kgf, and the D surface is -10.34 kgf, and -10.34 kgf remains from the difference force. .. That is, by stroking the honing tool 1 up and down, a positive and negative force of 10.34 kgf is constantly generated.

On the other hand, the operating resistance of the work holding jig is 0.24 kgf (actual measurement value), and when subtracted from the generated force, a positive / negative force of 10.1 kgf (98.98 N) is generated in the work 50. This force has a cutting speed of φ0.001 mm / sec, and can be assumed by superimposing the measured values when the speed is changed. Since a processing method for controlling the force of the cutting shaft is used in the normal honing process, this force can be easily formulated.

Next, the stroke force F3 generated by the stroking is determined. Using the calculation formula used in the calculation of the processing force F1, 400/210 × 3.5 × 2 × 0.24 = 3.2 kgf (31.3 N). The length is 3.5 because the processing length is used. The above equation is a force when pulled straight, and since there is a direction of rotation, the force is replaced as a component force (crosshatch angle).

Assuming that the processing conditions are φ11 (circumferential length 34.54 mm), 210 rpm, stroke F400 mm / min, and 1.905 mm per rotation, the component force is Tan (1.905 / 34.54) = 3.157 °. Therefore, the thrust direction Cos (3.157) × 3.2 = 3.195 kgf (31.3 N). Since this force is received by the edge of the wall, it is dispersed as it is in the 90 ° direction and a force is applied in the tool thrust direction. However, since the thrust direction rigidity is very strong, the work 50 is used as the reaction force. Consider that it can be treated as a pressing force. That is, a positive / negative force of 3.195 kgf (31.3 N) is generated in the work 50.

It is estimated that the component force in the rotation direction Sin (3.157) × 3.2 = 0.17 kgf is more often absorbed by the tool bending, and may be excluded from the influence.

Therefore, the force F4 that shakes the work holding jig 10 is F4 = F1 + F2 + F3, and has a fluctuating force of 0.00185 + 10.1 + 3.195≈13.296 kgf (130.3N).

That is, the unbalanced pressing force F4 generated by the pressing force applied by the honing grindstone 6 is 130.3N.

If the size of the air outlet 22a is 65 mm in the outer diameter of the work holder 16, the length in the circumferential direction of 45 ° divided into eight equal parts is about 25.51 mm. Assuming that the room is divided by a thickness of 2 mm, the height of the outlet 22a is 2.35 cm, the width is 1.5 cm, and the area is 3.527 cm2. In order to obtain a reaction force of 130.3 N with this magnitude, 1 / 3.526 × 130.3 = 37.0 N, and a discharge pressure of 0.37 MPa / cm2 is required.

Here, it was found that by providing the connecting groove 22b, the air flow is rectified and the residual pressure can be obtained for a long time. It was also found that wrapping with air from adjacent outlets 22a can contribute to stabilizing the supply to some extent.

-Valve control-
As shown in FIG. 6, when the ON / OFF time was 0.022 seconds (pause 0.011 seconds), the operation diagram shown in FIG. 6 was obtained. When the corresponding valve receives an open command, the valve opening time including rising and falling is set to 0.037 seconds.

There is a lap time of 0.007 seconds as a reaction time between the adjacent outlets 22a. This lap time of 0.007 seconds is about 3.5 ° with an outer diameter of 65 mm (φ65 × 3.14 × 3.5 ° / 360 ° = 1.98 mm), which is comparable to a thickness of 2 mm. In other words, it was found that it was possible to supply to both sides while passing through the wall.

By adjusting at least the dividing range to the wrapping time between the adjacent outlets 22a and using the connecting groove 22b, it is possible to survive the portion that cannot be supplied. When the number of revolutions was increased, a response delay occurred, but the relationship between opening and closing was constant, and it was found that there was no problem in use.

As another example, the case of rotation of 400 rpm is shown in FIG. You can see that the lap time is getting longer. From this, it can be seen that when the number of revolutions is high, it is no longer necessary to consider the transition and the region that cannot be supplied. However, it becomes the limit of valve response. For example, when applying the condition that the rotation speed of the honing tool 1 is less than 200 rpm, it is important to consider the above-mentioned opening / closing relationship.

-Action and effect of this embodiment-
As described above, in the present embodiment, high-pressure air is discharged from a plurality of air discharging portions 20 to the work holder 16 or the inner rotating body 15 holding the work W from a predetermined position in the circumferential direction. Therefore, for example, one honing. A discharge pressure can be applied from the opposite side so as to cancel the pressing force applied by the grindstone 6. Therefore, precise machining is possible by utilizing the floating function of the work holding jig 10.

In the present embodiment, rectification occurs by communicating the adjacent air discharge portions 20 with each other through the connecting groove 22b, so that the fluid is appropriately flowed into the adjacent outlet 22a where the fluid is not discharged, and the air flows rapidly. The adverse effects of this are prevented.

In the present embodiment, since the annular body may be provided at equal intervals, the air discharge portions 20 can be easily formed and controlled, and the reaction force can be easily controlled by increasing the number of the air discharge portions 20.

Therefore, according to the honing machine according to the present embodiment, the fluid is discharged from the air discharge portion 20 provided at a predetermined position in the circumferential direction with respect to the work holder 16 holding the work W or the inner rotating body 15. Therefore, the machining accuracy can be improved without impairing the floating function of the jig.

(Other embodiments)
The present invention may have the following configuration with respect to the above embodiment.

That is, in the above embodiment, the high-pressure air is discharged so as to cancel the pressing force applied by the honing grindstone 6, but if a force larger than the pressing force of the honing grindstone 6 is supplied, the overcut state is smaller than the opposite. It is also possible to intentionally create a state of uncut portion by supplying a force to obtain a desired inner diameter surface shape that is not a perfect circular shape. That is, the shape can be controlled by changing the pressure supplied to the valve. If the pressure cannot be changed significantly at the adjacent portion, a gentle shape change can be achieved.

Although the control in the above embodiment is performed by controlling only the time, the displacement sensor for the inner rotating body 15 and the work holder 16 is attached to the upper and lower stages, and the air discharge amount at each outlet 22a is corrected in real time. You may.

It should be noted that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications and applications.

1 Honing tool
2 rotary spindle
3 Tool body
4 tip
5 Through hole
6 Honing whetstone
7 Grindstone position detection switch
10 Work holding jig
11 Jig base
11a Lower opening
11b bottom plate
11c 1st side plate
11d 2nd side plate
12 1st horizontal axis
12a 1st bush
12b 2nd bush
13 Outer rotating body
13a 1st through hole
13b 2nd through hole
13c pin
14 2nd horizontal axis
15 Inner rotating body
15a Inner through hole
15b pin
16 Workholder
16a mounting bolt
16b Lid member
20 Air discharge part (fluid discharge part)
21 First outer ring
21a Fixing screw
21b Air supply port
22 First inner ring
22a outlet
22b connecting groove
23 Connector part
24 Second outer ring
25 Second inner ring
50 works
50a-50d 1st to 4th machined surfaces
51 Hole to be machined
P1 to P8 Upper outlet
P9 to P16 Lower outlet

Claims (10)

A rotating spindle that can be reciprocated in the axial direction of the inner diameter surface of the work hole to be machined and that can rotate around the axis, a honing tool that is detachably attached to the tip of the rotating spindle, and the workpiece that has the machined hole In a honing machine equipped with a work holding jig that supports the work in a floating state in the horizontal direction while facing so as to extend in the vertical direction.
The honing tool comprises at least one honing grindstone capable of radially projecting and retracting.
The work holding jig is
Jig base and
An outer rotating body that is rotatably supported about the first horizontal axis and movably supported along the first horizontal axis with respect to the jig base.
An inner rotating body that is supported so as to be rotatable about a second horizontal axis extending in a direction perpendicular to the first horizontal axis with respect to the outer rotating body and movably along the second horizontal axis.
A work holder that is fixed to the inner rotating body and that positions and holds the work in a removable manner.
A honing processing machine including a plurality of fluid discharge portions for discharging fluid from a predetermined position in the circumferential direction with respect to the work holder or the inner rotating body. In the honing processing machine according to claim 1,
The plurality of fluid discharge portions are configured to discharge fluid from the opposite side of the honing grindstone in accordance with the rotation of the honing grindstone so as to cancel the pressing force applied by the honing grindstone. Honing machine. In the honing processing machine according to claim 1,
The honing machine is characterized in that the plurality of fluid discharge portions are configured to be able to form a desired inner diameter surface shape by adjusting the pressure of the fluid in response to the pressing force applied by the honing grindstone. In the honing processing machine according to any one of claims 1 to 3,
A honing machine characterized in that the plurality of fluid discharge portions are provided at predetermined intervals on an annular body provided around the work holder or the inner rotating body. In the honing processing machine according to claim 4,
The annular body is a honing machine characterized in that it is fixed to the jig base. In the honing processing machine according to claim 4 or 5.
The above-mentioned annular body is a honing processing machine characterized in that a pair of upper and lower rings is provided. In the honing processing machine according to any one of claims 4 to 6.
A honing machine characterized in that a connecting groove for communicating adjacent air outlets is formed on the peripheral edge of the air outlets of the plurality of fluid discharge portions on the inner diameter surface of the annular body. In the honing processing machine according to any one of claims 4 to 7.
A honing machine characterized in that the plurality of fluid discharge portions are provided in multiples of 4. In the honing processing machine according to any one of claims 1 to 8.
The plurality of fluid discharge parts are composed of discharge parts for discharging high-pressure air.
A honing processing machine characterized in that it is configured to be blown out in a direction that cancels the pressing force of the honing grindstone in accordance with the rotation of the honing grindstone. A rotating spindle that can be reciprocated in the axial direction of the inner diameter surface of the work hole to be machined and that can rotate around the axis, a honing tool that is detachably attached to the tip of the rotating spindle, and the workpiece that has the machined hole In a machining method using a honing machine equipped with a work holding jig that supports the work in a floating state in the horizontal direction while facing so as to extend in the vertical direction.
The honing tool is provided with at least one honing grindstone capable of projecting and retracting in the radial direction, and the work holding jig is rotatable about a jig base and a first horizontal axis with respect to the jig base. In addition, it can be rotated around an outer rotating body that is movably supported along the first horizontal axis and a second horizontal axis that extends in a direction perpendicular to the first horizontal axis with respect to the outer rotating body. Further, an inner rotating body that is movably supported along the second horizontal axis, a work holder that is fixed to the inner rotating body and that positions and holds the work in a removable manner, and a pressing force applied by the honing grindstone. A preparatory step of providing a plurality of fluid discharge portions for discharging fluid from a predetermined position in the circumferential direction with respect to the work holder or the inner rotating body so as to cancel out the above.
A calculation process for calculating the discharge pressure of the fluid that cancels the pressing force that presses the workpiece with the honing tool, and
The work mounting process for attaching the work to the work holder, and
While rotating the honing tool around the rotating spindle, the honing grindstone is reciprocated in the axial direction of the inner diameter surface of the hole to be machined of the work to press the honing grindstone against the inner diameter surface and cancel the pressing force by the honing grindstone. A processing method using a honing machine, which comprises a grinding step of discharging the fluid from the corresponding one of the plurality of fluid discharge portions according to the position of the honing grindstone in the direction.

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