JPH0639050B2 - Rounding machine for slipper surface of rocker arm - Google Patents

Description

Description: TECHNICAL FIELD The present invention mainly relates to a rounding device for a slipper surface of a rocker arm that operates an intake / exhaust valve of an automobile engine, and more specifically, to a polishing surface of a grinding wheel. The rocker arm slipper surface can be rounded without forming a rounded shape, and each drive mechanism is automatically drive-controlled in association with each other, thereby improving work efficiency and manufacturing cost. The present invention relates to a rounding device for a slipper surface of a rocker arm, which can reduce the above.

(Prior Art) Conventionally, the processing for polishing the slipper surface of the rocker arm for operating the intake / exhaust valve of an automobile engine into a round shape has been performed by the apparatus shown in FIG. 15 in the following manner.

That is, the above-mentioned processing device is provided on the rotation axis a of the surface grinder,
A disk-shaped grinding wheel e is attached, and the grinding wheel e is formed to have the same outer peripheral surface (polishing surface) b as the finished shape (rounded shape) of the slipper surface d of the rocker arm c to be processed. ing. A support shaft f orthogonal to the rotation shaft a is swingable, and the rocker arm c is held and positioned by the support shaft f.

Then, while the grindstone e is driven to rotate, the rocker arm c is reciprocated in the support axis f direction,
A method has been adopted in which the slipper surface d is reciprocally moved with respect to the polishing surface b of the grinding wheel e to polish it into a desired rounded shape.

(Problems to be Solved by the Invention) However, such a processing method has the following disadvantages.

(1) When the polishing surface b has the finished shape of the slipper surface d of the rocker arm c to be machined as described above, the width W of the grinding wheel e is actually as shown in FIG. It must be set wider than the width w of the d in the rotation direction.

However, when the width W of the grinding wheel e is wider than the width w of the slipper surface d in this way, only the portion of the polishing surface b that is in contact with the slipper surface d is worn and reduced by the polishing process.
As a result, the cross-sectional shape of the entire polishing surface b in the width direction becomes different from the rounded shape of the slipper surface d with time. Then, a portion of the polishing surface b that remains unpolished is polished and removed by a trueing process, and the polishing surface b is formed again to have a rounded surface having the same shape as the slipper surface d. Needs to be fixed,
For this reason, it requires labor and cost, resulting in a decrease in work efficiency and an increase in manufacturing cost.

(2) On the polishing surface b of the grinding wheel e, a portion wider than the slipper surface d does not contribute to the rounding of the slipper surface d and is ground and removed by the trueing process as described above. The material is wastefully consumed, which also causes an increase in manufacturing cost.

(3) Since the polishing surface b has a shape corresponding to a specific slipper surface d, a plurality of types of rocker arms c having different radius dimensions (curvature radius dimension) of the slipper surface d
When machining, the grinding wheel e having a polishing surface b of a corresponding shape is replaced for each machining, or
Alternatively, it is necessary to reshape the polishing surface b of the grinding wheel e into the new rounded shape.

However, in the former case, the spare grinding wheel e to be replaced is
Since it is necessary to prepare the number corresponding to the round shape to be processed, the cost required for the preparation becomes large. On the other hand, in the latter case, not only the labor and cost for the trueing are required, but also the life itself is shortened due to the unnecessary polishing removal of the grinding wheel e.

(4) Of the above-described processing steps, most of the steps such as attaching / removing the rocker arm c to / from the support shaft f and reciprocating the rocker arm c have been performed manually.
For this reason, especially in a mass production site, coupled with the problem of the shape of the grinding wheel e, the work efficiency is very poor, and it is difficult to significantly reduce the manufacturing cost.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to perform the rounding on the slipper surface of the rocker arm without forming the rounded shape on the polishing surface of the grinding wheel, and each drive It is an object of the present invention to provide a rounding device for a slipper surface of a rocker arm, in which the mechanisms are automatically driven and controlled in association with each other to improve work efficiency and reduce manufacturing cost.

(Means for Solving the Problems) In order to achieve the above object, a radius processing device for a slipper surface of a rocker arm of the present invention includes a grinding wheel side unit including a rotationally driven disk-shaped grinding wheel, and a rocker arm. A jig side unit including a swingable jig to be held, a conveying means for conveying a rocker arm, and a rocker arm conveyed by the conveying means for carrying in and out of the jig of the jig side unit. The grinding wheel-side unit, the jig-side unit, and the carry-in / carry-out means are automatically associated with each other to automatically control the drive, and the grinding wheel is provided with a grinding wheel on one side thereof. The jig of the jig-side unit has a polishing surface formed of a plane perpendicular to the axis of the vehicle rotation shaft, and the jig of the jig-side unit has a rocker arm holder that holds the slipper surface of the rocker arm so as to face the polishing surface. Holding means, the swing axis of the jig is arranged with its swing axis parallel to the polishing surface, and is perpendicular to the polishing surface and the polishing surface and the slipper. The swing shaft is arranged so as to be in a plane including a contact line with a surface, the swing shaft is coupled to swing means for reciprocally rotating the jig within a set rotation angle range, and the grindstone-side unit and One of the jig-side units includes a space adjusting means for variably adjusting the space between the polishing surface of the grinding wheel and the swing axis of the jig.

The polishing surface is a circular polishing surface formed on the entire one side surface of the grinding wheel, or an annular polishing surface formed with a predetermined polishing surface width on the entire outer peripheral edge of the one side surface of the grinding wheel.

Further, in the case of the annular polishing surface, the polishing surface width h is such that the outer diameter of the annular polishing surface is 2r, and the outer diameter line of the annular polishing surface intersects the contour lines at both ends in the width direction of the slipper surface. When the central angle of the grinding wheel that sandwiches two points is θ,
It is represented by h = 2rsin ² θ / 4.

(Operation) The processing procedure of the slipper surface of the rocker arm by the radius processing apparatus of the present invention is as follows.

The unprocessed rocker arm transported by the transport means is
It is set on the jig of the jig side unit by the loading / unloading means and is rocked together with the jig. As a result, the slipper surface is swung in a predetermined rotation angle range with a predetermined turning radius, and during this swinging rotation, the required rounding is performed by the grinding surface of the grindstone-side unit grinding wheel.

The processed rocker arm is
From the jig of the jig side unit, it is carried out again onto the transport means,
Collected as a finished product.

At this time, the jig-side unit and the loading / unloading means are automatically driven and controlled in association with each other by the automatic control-side means.

Further, the slipper surface of the rocker arm is cut by rocking with respect to the polishing surface of the wheel that is rotationally driven,
Since it is configured to be rounded, the grinding surface of the grinding wheel does not need to have a specific finished shape of the slipper surface, and various rounded shapes can be processed by adjusting the swinging turning radius of the slipper surface. Is possible.

(Embodiment) FIG. 1 shows a radius machining device for a slipper surface of a rocker arm that is an embodiment according to the present invention. The radius machining device includes a grinding wheel side unit A including a grinding wheel 1 that is rotationally driven. A jig side unit B including a swingable jig 3 for holding the rocker arm 2, a carrying means C for carrying the rocker arm 2, a carrying-in / carrying-out means D for carrying the rocker arm 2 in and out of the jig 3. An automatic control means E for automatically driving and controlling these in association with each other is provided.

As shown in FIGS. 2 to 4, the grindstone-side unit A is composed of a spindle unit 4 and a sliding unit 5. In the illustrated example, two grindstone-side units A are mounted on a base frame 6. It is provided.

The spindle unit 4 rotationally drives the grinding wheel 1, and includes a rotating spindle 7 and a spindle motor 8 as main parts. As shown in FIG. 2, the rotary main shaft 7 has a main shaft main body 9
, And is rotatably held in a horizontal state via bearings 10, 10. The grinding wheel 1 is detachably attached to the tip of the rotary spindle 7 with a tightening nut 11.

Further, the timing pulley 1 is provided at the rear end of the rotary main shaft 7.
2 is attached. The spindle motor 8 is installed on the spindle body 9 and has a drive shaft 8a.
A timing pulley 13 is attached to the. The timing pulley 13 and the timing pulley 12 of the rotary spindle 7 are linked via a timing belt 14. As a result, the grinding wheel 1 is rotationally driven by the spindle motor 8 together with the rotary spindle 7 via the timing belt 14.

The grinding wheel 1 has a disk shape, and a polishing surface 1a is formed on one side surface thereof. That is, the polishing surface 1a
Is a circular polishing surface formed on the entire one side surface of the grinding wheel 1, and is a plane perpendicular to the axis of the rotary spindle 7.

The sliding unit 5 includes the polishing surface 1a of the grinding wheel 1,
Distance adjustment means for variably adjusting the distance from the center line (oscillation axis) of the oscillation shaft 15 of the jig 3, which is a slide base 16 that supports the spindle unit 4, and the slide base 16
Is provided as a main part with a servomotor 17 for moving the motor in a direction parallel to the rotating main shaft 7.

The main spindle body 9 of the main spindle unit 4 is fixedly mounted on the sliding base 16. The sliding base 16 is
A fixed table 18 fixed to the base frame 6 is slidable in a direction parallel to the rotary main shaft 7. Further, the sliding base 16 has a screw hole 16 extending in the horizontal direction.
The ball screw 19 is coupled to the screw hole 16a so as to be relatively movable forward and backward. The ball screw 19
Is rotatably held on the fixed base 18 via bearings 20, 20 in a horizontal state. Ball screw 19
One end 19a of is connected to the drive shaft 17a of the servomotor 17 via a joint (not shown).

When the ball screw 19 is rotated in the forward and reverse directions by the servo motor 17, the spindle unit 4 is rotated.
Is reciprocally slid in the left-right direction in FIGS. 2 and 4 together with the sliding base 16 screwed into the ball screw 19 so as to make a notch in the slipper surface 2a of the rocker arm 2. The amount is adjusted.

The cut amount is detected and controlled by reading the rotation angle of the drive tree 17a of the servo motor 17 with a pulse encoder (not shown).

Further, in the illustrated example, the sliding unit 5 is provided in the grindstone side unit A so that the spindle unit 4 is moved and adjusted, but instead of this, the jig side unit B is adjusted in space. Means are provided for the jig side unit B
The jig 3 may be moved and adjusted.

As shown in FIGS. 2 to 4, the jig side unit B includes the jig 3, the swing shaft 15 and the servo motor 22 as main parts. In the illustrated example, two jig-side units B are provided on the base frame 6 corresponding to the grindstone-side units A, A.

The jig 3 includes rocker arm holding means for positioning and holding the rocker arm 2. In the illustrated example, the rocker arm holding means is composed of a shaft member 23, a pressing lever (pressing member) 24, and a positioning member 25, which are provided on the upper surface 3 a of the jig 3.

The shaft member 23 is provided so as to project upward from the upper surface 3a of the jig 3, and a shaft hole 26 provided in the longitudinal intermediate portion of the rocker arm 2 is fitted into the shaft member 23. The rocker arm 2
Is rotatably supported on the jig 3 in a horizontally rotatable manner.

The pressing lever 24 and the positioning member 25 are provided on the upper surface 3 a of the jig 3 on the rear surface 2 b side of the rocker arm 2 with respect to the grinding wheel 1.

As shown in FIG. 3, the pressing lever 24 is pivotally attached to a pivot 29 projecting upward from the upper surface 3a of the jig 3, and the tip 24a of the pressing lever 24 is attached to the rocker arm 2 as shown in FIG.
It is adapted to be locked to the base end side portion of the back surface 2b.
Reference numeral 30 is a spring for urging the pressing lever 24 toward the rocker arm 2 side. One end of the spring 30 is held by the upper surface 3a of the jig 3, and the other end thereof is the pressing lever 24. Is locked to. Instead of the pressing lever 24 in the illustrated example, another pressing member (not shown) that operates by a hydraulic cylinder, an air cylinder, or the like may be used.

Further, the positioning member 25 includes a plurality of screws 31, 31, ...
Is attached to the upper surface 3a of the jig 3, and the tip of the adjusting screw 32 screwed to the positioning member 25 is
The rocker arm 2 is adapted to be engaged with the slipper surface 2a side portion (tip end side portion) of the back surface 2b.

Therefore, the rocker arm 2 is urged by the pressing lever 24 to rotate clockwise around the shaft member 23 in FIG. 3, and is moved to a predetermined position by the adjusting screw 32 of the positioning member 25. It is supported so that the slipper surface 2a is positioned so as to face the polishing surface 1a of the grinding wheel 1.

The position of the slipper surface 2a of the rocker arm 2 can be adjusted by moving the adjusting screw 32 forward and backward. After adjusting the position of the slipper surface 2a, the adjusting screw 32 is securely held in that position by a lock nut 33 that is screwed into the adjusting screw 32.

Further, the lower surface 3b of the jig 3 is provided with a shaft mounting hole 34 as shown in FIG. A projection 15a provided on the upper end of the swing shaft 15 is fitted into the shaft mounting hole 34, and the swing shaft 15 and the jig 3 are connected by a plurality of screws 35, 35 ... Are united together.

The swing shaft 15 is rotatably attached to a shaft holding member 37 attached to the base frame 6 via bearings 36 ...
It is held vertically. Further, the lower end of the swing shaft 15 is connected to the servo motor 2 through a joint means (not shown).
It is linked to two drive shafts. Thereby, the jig 3
The slipper surface 2a of the rocker arm 2 held by
The forward / reverse rotation of the swing shaft 15 by the servo motor 22 causes the central axis WW of the swing shaft 15 (see FIG. 4).
It is reciprocally rotated within a set angle range centering around.
In addition, this angle range is a pulse encoder (not shown)
Thus, detection control is performed by reading the rotation angle of the drive shaft of the servo motor 22.

Further, the central axis (swing axis) W-W of the swing shaft 15
Are arranged in parallel to the polishing surface 1a as shown in FIG. 4 and are arranged so as to be in the vertical plane Z as shown in FIGS. 3, 5, and 6. ing. The vertical plane Z includes a contact line (a line parallel to the width direction of the slipper surface) that is perpendicular to the polishing surface 1a of the grinding wheel 1 and that is between the polishing surface 1a and the slipper surface 2a.

As shown in FIG. 1, the carrying means C is provided close to the edge 38 on the jig side unit B side of the base frame 6, and in the illustrated example, is parallel to the edge 38. It is composed of a carry-in conveyor 39 and a carry-out conveyor 40, which extend in parallel.

The carry-in conveyor 39 sequentially conveys the unprocessed rocker arm 2 to the carry-in / carry-out means D and supplies it, and is driven to move downward in FIG. Also,
Positioning stoppers 41, 41 are provided at the leading end of the carry-in conveyor 39, and the rocker arm 2 being conveyed is stopped by this positioning stopper and stands by there for a certain period of time.

On the other hand, the carry-out conveyor 40 sequentially receives and carries out the processed rocker arm 2 supplied from the carry-in / carry-out means D, like the carry-in conveyor 39.
In the figure, the vehicle is driven downward. In addition, a storage box 42 is arranged at the front end portion of the carry-out conveyor 40, and the rocker arms 2 that have been transported are sequentially stored in this storage box.

The carry-in / carry-out means D supplies the unprocessed rocker arm 2 supplied by the carry-in conveyor 39 and the jig 3 and carries in / out the machined rocker arm 2 from the jig 3. A robot, the first
As shown in FIG. 2, a moving table 43, and a loading loader 44 and a loading loader 45 mounted on the moving table 43 are provided as main parts.

The moving table 43 is driven by a driving unit (not shown).
That is, the rotation axis direction of the grinding wheel 1 (X direction in FIG. 1)
And is movable in a direction perpendicular to this (Y direction in FIG. 1). This moving range is detected by a limit switch (not shown) such as a proximity switch.

The carry-in loader 44 and the carry-out loader 45 are mounted vertically downward on the moving table 43, and by moving the moving table 43 in the X and Y directions, the two jigs 3 in FIG. , 3, the carry-in conveyor 39, and the carry-out conveyor 40.

As shown in FIGS. 13 (a) and 13 (b), the loading loader 44 includes a loader body 46 that can be moved up and down with respect to the moving table 43, and a tip portion (lower end) of the loader body 46. Part) provided with a collet chuck mechanism 47,
A lifting cylinder 48 for lifting the loader body 46.
And an operating cylinder 49 for operating the collet chuck mechanism 47. The collet chuck mechanism 47 includes a collet 47a and an operating rod 47b for expanding the collet 47a, and the operating rod 47b is connected to the operating cylinder 49. The collet 47a is always elastically urged downward by the spring 50.

The chucking operation of the rocker arm 2 by the loading loader 44 is as shown in FIG. 13 (a).
Is lowered, which causes the collet chuck mechanism 4 to move.
The collet 47a of No. 7 is inserted into the shaft hole 26 of the unprocessed rocker arm 2 waiting on the carry-in conveyor 39 up to a midway part. Subsequently, the working cylinder 49
Of the collet 47a by the projecting operation of the shaft hole 26
The rocker arm 2 is expanded inside, and thereby the rocker arm 2 is chucked. Then, the loader main body 46 is raised by the retracting operation of the elevating cylinder 48 in this chuck state.

On the other hand, the mounting operation (loading operation) of the rocker arm 2 to the jig 3 by the loading loader 44 is as shown in FIG. 13 (b). While the arm 2 is being chucked, it is lowered, and immediately before the collet 47a hits the shaft member 23 of the jig 3, the working cylinder 49a
Moves back and forth, and the collet 47a contracts and closes, whereby the chucking force of the rocker arm 2 by the collet 47a is relaxed. When the lifting cylinder 48 further projects, the lower end edge 46a of the loader body 46 is moved.
Thereby, the rocker arm 2 is pushed into the shaft member 23 and set. In this case, the collet 47a is always in contact with the shaft member 23 by the urging force of the spring 50.

As shown in FIGS. 14 (a) and 14 (b), the carry-out loader 45 includes a loader body 51 that can be moved up and down with respect to the moving table 43, and a tip portion (lower end) of the loader body 51. Section), an elevating cylinder 53 for elevating the loader body 51, and an actuating cylinder 54 for activating the chuck mechanism 52.

The chuck mechanism 52 includes a sliding pin 52a, a pressing cylinder 52
It consists of b and L-shaped chuck claws 52c. The sliding pin 52a is slidably provided in the loader body 51 in the vertical direction, and is elastically urged downward by a spring 55. The holding cylinder 52b is provided on the loader body 51 so as to be slidable in the vertical direction, and is elastically biased downward by a spring 56. The stopper cylinder 52b is prevented from coming off from the loader body 51 by a stopper (not shown). An upper end portion of the chuck claw 52c is pivotally attached to a support cylinder 58 by a support shaft 57, and is connected to the operating cylinder 54. 5
9 is a positioning stopper.

The chucking operation of the rocker arm 2 by the carry-out loader 45, as shown in FIG. 14 (a), first, the loader main body 51 is lowered by the projecting operation of the elevating cylinder 53 to slide the chuck mechanism 52. The moving pin 52a elastically contacts the upper end of the shaft member 23 of the jig 3. At the same time, the lower end of the pressing cylinder 52b elastically contacts the upper surface of the processed rocker arm 2 held by the shaft member 23.

Next, by the retracting operation of the operating cylinder 54, the chuck claw 52c swings around the support shaft 57, and the tip portion 60 thereof is inserted into the lower side of the rocker arm 2. At this time, the positioning stopper 59 comes into contact with the support cylinder 58 to position the chuck claw 52c.

When the operating cylinder 54 further retracts, the chuck claw 52c maintains the posture thereof and the supporting cylinder 5 is held.
Rise with 8. Then, the rocker arm 2 also
The chuck claw 52c is lifted in a state of being sandwiched between the tip portion 60 and the pressing cylinder 52b, and by this lifting operation, the sliding pin 52a is inserted into the shaft hole 26 of the rocker arm 2 and the rocker arm 2 is moved. Is chucked. Then, in this chuck state, the loader body 51
Rises due to the retracting operation of the lifting cylinder 53 (see FIG. 14 (b)).

On the other hand, in the unloading operation of the rocker arm 2 onto the unloading conveyor 40 by the unloading loader 45, first, the loader main body 51 is lowered by the protruding operation of the elevating cylinder 53.
Next, due to the projecting operation of the operating cylinder 54, the chuck claw 52c maintains its posture, and the supporting cylinder 58 is held.
Descends with. Thereby, the rocker arm 2
Also the tip portion 60 of the chuck claw 52c and the holding cylinder 52b.
The slide pin 52a is relatively retracted (withdrawn) from the shaft hole 26 of the rocker arm 2 by the descending operation while being sandwiched by the rocker arm 2.

When the operating cylinder 54 further projects, the chuck claw 52c swings around the support shaft 57, and the tip 60 thereof is removed from the rocker arm 2 side.
As a result, the rocker arm 2 has the holding cylinder 52b.
It is pressed by and is placed on the carry-out conveyor 40.

The automatic control means E is specifically an NC controller and is housed in a control box (not shown).
Required numerical data is input through an operation panel provided in the control box, whereby the grindstone side unit A, the jig side unit B, the transfer means C, and the loading / unloading means (loading / unloading robot) D. , The actuators of the automatic control means E are driven and controlled in relation to each other.

Next, a method of rounding the slipper surface 2a of the rocker arm 2 by the apparatus of the present invention configured as described above will be described.

When the unprocessed rocker arm (work) 2 is automatically or manually placed on the carry-in conveyor 39, each rocker arm 2 is carried by the carry-in conveyor 39 in the downward direction in FIG. .

The conveyed rocker arm 2 is positioned by the positioning stopper 41 at the leading end of the carry-in conveyor 39 and stands by at this position.

The loading loader 44 of the loading / unloading robot D is moved above the positioning stopper 41, and the rocker arm 2 standing by on the loading conveyor 39 is chucked and lifted by the above-described operation (FIG. 13 (a)). )reference).

The loading / unloading loader 45 of the loading / unloading robot D is the first
In the figure, the upper rocker arm 2 is moved above the jig 3 of the jig side unit B, and the processed rocker arm 2 on the jig 3 is chucked and lifted by the above-described operation (fourteenth
See Fig. (A) and Fig. 14 (b).

The loading loader 44 is moved above the jig 3, and the unprocessed rocker arm 2 chucked in the above step is set on the jig 3 by the above-described operation (see FIG. )reference).

Then, the unprocessed rocker arm 2 set on the jig 3 is subjected to rounding processing in accordance with a grinding process described later.

On the other hand, the carry-out loader 45 includes the carry-out conveyor 40.
The processed rocker arm 2 that has been chucked in the above process is placed on the carry-out conveyor 40 by the above-described operation.

The processed rocker arm 2 carried out onto the carry-out conveyor 40 is housed in the housing box 42 as a finished product.

The steps from to are repeated again, and this time, the rounding process by the lower grindstone side unit A and the jig side unit B in FIG. 1 is executed.

 After that, the steps from to are repeated.

Next, the grinding step will be described.

i) The grinding wheel 1 is moved to the grinding position by the sliding unit 5.

ii) By means of the spindle motor 8 of the grinding wheel side unit A (the spindle motor 8 is constantly driven during the grinding process)
Is driven to rotate, the servo motor 22 of the jig side unit B is activated, and the jig 3 moves the axis O of the swing shaft 15.
It is rotated forwards at a constant speed in the direction of the grinding wheel 1 (clockwise in FIG. 5) about the (oscillation axis WW).

As a result, the slipper surface 2 a of the rocker arm 2 rotated about the axis O is the polishing surface 1 of the grinding wheel 1.
By a, a rounded surface having a radius of curvature R is roughly finished.

When the rough finishing is completed, the slipper surface 2a is located away from the polishing surface 1a of the grinding wheel 1 in the clockwise direction in FIG.

iii) When the rough finishing is completed, the grinding wheel 1 is moved by the sliding unit 5 in the direction of the jig 3 (rightward in FIG. 3) by the finishing allowance, for example, 0.02 mm, and finish grinding is performed. Is located in position.

iv) On the other hand, as described above, the slipper surface 2a is the polishing surface 1
When it becomes a state away from a, the rotation direction of the swing shaft 15 is switched to the opposite direction (counterclockwise direction in FIG. 5) by the servo motor 22 under a preset condition, and the constant speed is maintained. At the position where the jig 3 is returned and rotated, and the jig 3 returns to the standby position (the position indicated by the chain double-dashed line in FIG. 5),
The forward rotation is stopped.

By this backward rotation, as shown in FIG. 6, the slipper surface 2a of the rocker arm 2 is polished by the polishing surface 1a by the above-mentioned finishing allowance and finished to a predetermined radius dimension R ₀ .

The above is mainly the case where the rough grinding and the finish grinding are each performed once, but when the grinding allowance of the slipper surface 2a is large, the operations i) and ii) are repeated an appropriate number of times. .

As described above, the rocker arm 2 is swung with respect to the polishing surface 1a of the rotating grinding wheel 1 about the swing shaft 15, so that the slipper surface 2a of the rocker arm 2 has the above curvature. A rounded surface having a radius R ₀ will be very easily formed.

Moreover, even when the radius dimension formed on the slipper surface 2a is changed, the grinding wheel side unit A is moved by the sliding unit 5, so that the rocker arm 2 is moved.
The distance between the rocking center O and the polishing surface 1a of the grinding wheel 1 is set to a desired new radius dimension. Therefore, it is possible to freely form rounded surfaces of various sizes on the slipper surface 2a by using the same grinding wheel 1. Therefore, as in the conventional rounded processing technique described above, new rounded surfaces are formed on the outer peripheral surface. There is no need to replace it with another spare grinding wheel on which the grinding surface has been formed, or to true the grinding surface of the new grinding wheel on the outer peripheral surface of the grinding wheel in use.

When the polishing surface 1a of the grinding wheel 1 is worn,
The swing center O of the jig 3 is slightly moved in the radial center direction of the grinding wheel 1, and the slipper surface 2a of the rocker arm 2 is moved.
Contact the new polished surface 1a that is not worn,
Alternatively, the grinding wheel 1 may be reattached so that the side surface of the grinding wheel 1 opposite to the polishing surface 1a faces the rocker arm 2 side. Therefore, a plurality of slipper surfaces 2a are attached to the slipper surface 2a by the same grinding wheel 1. It is possible to perform rounding processing over a number of times. Therefore, the life of the grinding wheel 1 is remarkably extended as compared with the conventional case where the rounded grinding surface is formed on the outer peripheral surface of the grinding wheel 1 (see FIG. 15), whereby the slipper surface 2a is processed. The cost can be reduced.

FIG. 7 shows another embodiment of the present invention.
It is a modification of the structure of the grinding wheel 1 in the embodiment of FIGS.

That is, a cylindrical or frustoconical recess 1c is provided on one side surface of the grinding wheel 1, and an annular polishing surface 1b having a predetermined polishing surface width (radial width) h is formed on the outer peripheral edge portion of the side surface. Has been done.

The polishing surface width h is set so that the entire width direction of the slipper surface 2a (the direction perpendicular to the paper surface of FIG. 7) is polished linearly, and the setting conditions are set as follows.

In FIG. 8, S is the width dimension of the slipper surface 2a, and the straight line WW shows the central axis (rocking axis) of the rocking shaft 15.

In order for the slipper surface 2a to be linearly polished in its entire width direction, points C and D at which the outer diameter line of the annular polishing surface 1b intersects the contour lines at both ends in the width direction of the slipper surface 2a, Further, the inner diameter line is the central axis line W- of the swing shaft 15.
If the point in contact with W is E, then C and D are the central axis W
It may be located on -W.

When the grinding surface width h satisfies this condition, the rotation center of the grinding wheel 1 is O'and the outer diameter of the annular grinding surface 1b is 2
r, the inner diameter is 2r ', and the central angle ∠CO'D of the grinding wheel 1 which sandwiches two points where the outer diameter line of the annular polishing surface 1b intersects the contour lines at both ends in the width direction of the slipper surface 2a is θ, From the right angle ΔCEO ′, r ′ = r cos θ / 2 h = r−r ′ = r (1-cos θ / 2) Also, from cos θ / 2 = cos ² θ / 4−sin ² θ / 4 h = 2r sin ² θ / 4 Therefore, when r and θ are determined, the polishing surface width h can be calculated by using one of the above formulas.

In consideration of the fact that the grinding wheel width h is elastically deformed at the contact portion between the grinding wheel 1 and the slipper surface 2a to make surface contact (almost line contact) with a slight width, the polishing surface width h is usually calculated from the condition shown in FIG. r is slightly large and r'is slightly small (for example, about 0.5 mm)
Then, it is determined to be about 2.5 mm (see the width between two-dot chain lines in Fig. 8).

Then, when the grinding wheel 1 is configured as in the illustrated example, the annular polishing surface 1b of the grinding wheel 1 is on the straight line parallel to the central axis WW of the swing shaft 15 and the rocker arm 2 The slipper surface 2a is almost in contact with the entire width direction. For this reason, a rounded surface having a radius R ₀ centered on the rotation center O of the swing shaft 15 is machined on the slipper surface 2a while maintaining a straight state in the entire width direction (see FIG. 9 (b)). be able to.

Moreover, the polishing surface width h of the annular polishing surface 1b is 2.5.
Since it is determined to be around mm and is sufficiently smaller than the length of the slipper surface 2a in the rotation direction, the annular polishing surface 1b is worn in the same shape as the round shape of the slipper surface 2a. Therefore, even if the annular polishing surface 1b of the grinding wheel 1 is abraded over time, the slipper surface 2a can be rounded without re-trueing.

In addition, the polishing surface width h of the annular polishing surface 1b is sufficiently smaller than the distances R and _R0 between the rotation center O of the swing shaft 15 and the annular polishing surface 1b, and is kept substantially flat even after abrasion. Therefore, even when the radius dimension formed on the slipper surface 2a changes, the distances R and R ₀ can be changed without replacing the grinding wheel 1.
It is possible to perform rounded processing of various dimensions on the slipper surface 2a only by changing the.

Moreover, when the grinding surface width h of the grinding wheel 1 is properly selected, the amount of material used for the grinding wheel 1 is reduced, which is economical. Moreover, since it is not necessary to true the annular grinding surface 1b of the grinding wheel 1 as described above, it is possible to use a borazon grinding wheel as the grinding wheel 1 and prolong the life of the grinding wheel 1.

Further, in the case of the grinding wheel 1 having this configuration, the polishing surface width h of the annular polishing surface 1b and the central axis (swing axis) WW of the swing shaft 15 are obtained.
10 (a) and 11 (a), the cross-sectional shape of the slipper surface 2a in the width direction is shown in FIGS. 10 (b) and 11 (b), respectively. It becomes like This is because in FIG. 10 (a), the slipper surface 2a is contacted and polished between the annular polishing surface 1b and the FG on the WW line, but is not polished because it is not contacted between FC and GD. In FIG. 11 (a), the CHs and the JDs are in contact with each other and are polished, but the HJs are not in contact and polished.

In each of the above-described embodiments, the rounding of the slipper surface 2a of the rocker arm 2 is performed by the shaft hole 26 of the rocker arm 2.
Is rotatably held and the rocker arm 2
However, the case where the rocker arm 2 is fixed to a required position by the pressing lever 24 and the positioning member 25 has been described. However, the rocker arm 2 is not provided with the shaft hole 26 but is held on the jig 3 by other means. In this case, it is obvious that the slipper surface 2a can be rounded in exactly the same manner.

In addition, in the R processing device of the illustrated example, by NC control,
A series of processing steps such as rocker arm transportation, loading / unloading to / from jigs, and processing are fully automated, making it suitable for large-scale high-volume production. Instead of the output robot D, a semi-automatic device may be adopted by employing a hand-pulling machine (not shown) for manually setting the rocker arm 2 on the jig 3.

As described above in detail, according to the present invention, various excellent operational effects as listed below are exhibited.

(1) While the slipper surface of the rocker arm is pressed against the polishing surface formed on a plane perpendicular to the rotation axis of the grinding wheel,
Since it is swung about the swing axis located at a predetermined radius dimension from the polishing surface, the slipper surface polished by the polishing surface is formed into a radius surface having the radius radius as the radius. In addition, the polishing surface is always worn in a flat shape.

Therefore, the trueing process which is indispensable in the prior art in which the polished surface is formed into a round shape is not necessary because of the abrasion of the polished surface with time. Therefore, the labor and cost associated therewith are unnecessary, and the decrease in work efficiency and the increase in manufacturing cost are effectively prevented.

(2) Further, since the entire grinding surface of the grinding wheel contributes to the rounding of the slipper surface, the grinding wheel material is not wastefully consumed, and the cost can be reduced and the manufacturing cost can be reduced.

(3) In the device of the present invention, in either one of the grinding wheel side unit and the jig side unit, an interval for variably adjusting the interval between the polishing surface of the grinding wheel and the swing axis of the swing axis of the jig. Adjustment means are provided.

Therefore, since it is possible to freely form rounded surfaces of various dimensions on the slipper surface of the rocker arm simply by changing the distance between the polishing surface and the swing axis, even when changing the rounded dimensions of the slipper surface, the grindstone You don't have to replace the car or re-true the grinding surface of the grinding wheel.

Therefore, unlike the conventional case, it is not necessary to prepare the spare wheel wheels to be replaced in the number corresponding to the rounded shape to be processed, or the labor and cost for the trueing are unnecessary, and the cost can be reduced in this respect as well.

(4) In the apparatus of the present invention, a series of processing steps such as transfer of rocker arm, loading / unloading to / from jig and processing are completely automated by automatic control such as NC control. In combination with the advantage of the shape of the grinding wheel, the working efficiency is very good and the manufacturing cost can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing an outline of the entire device for rounding the slipper surface of a rocker arm that is an embodiment according to the present invention. FIG. 2 is a front view showing the main part of the same R-processing apparatus in a partial cross section. FIG. 3 is a plan view showing a partial cross-section of a relationship between a rocker arm and a main part of the R processing device. FIG. 4 is a front view showing a partial cross-section of the relationship between the rocker arm and the main part of the R processing device. FIG. 5 is a plan view of essential parts showing a state where roughening is performed on the slipper surface of the rocker arm by the same radius processing device. FIG. 6 is a plan view of relevant parts showing a state where the slipper surface of the rocker arm is subjected to final rounding by the same rounding device. FIG. 7 is a plan view showing a modified example of the grinding wheel in the R processing device in relation to the slipper surface of the rocker arm. FIG. 8 is an explanatory diagram showing the setting conditions of the polishing surface width of the annular polishing surface of the grinding wheel shown in FIG. 9 (a), 9 (b), 10 (a), 10 (b), and 11 (a) and 11 (b) are respectively shown in FIG. It is explanatory drawing which shows the influence which the contact position of the annular grinding | polishing surface of a grinding wheel and the slipper surface of a rocker arm gives to the axial cross-sectional shape of a slipper surface. FIG. 12 is a schematic perspective view showing a loading / unloading robot of the same R processing apparatus. 13 (a) and 13 (b) are longitudinal sectional views showing a loading loader of the loading / unloading robot, and FIG. 13 (a) shows a rocker arm chucked, and FIG. b) shows when the rocker arm is set on the jig. FIG. 14 (a) and FIG. 14 (b) are vertical cross-sectional views showing a loading / unloading loader of the loading / unloading robot, and FIG. 14 (a) shows a rocker arm chucked on a jig. Fig. 14
(b) shows the time when the rocker arm is unloaded from the jig. FIG. 15 is a plan view showing, in a partial cross section, a conventional rounding device for a slipper surface of a rocker arm. A: Grindstone side unit, B: Jig side unit, C:
Conveying means, D ... Carrying in / out means, E ... Automatic control means, 1
...... Grinding wheel 1a …… Circular polishing surface 1b …… Polishing surface 2
…… Rocker arm, 2a …… Slipper surface, 2b ……
Rear surface, 3 ... Jig, 4 ... Spindle unit, 5 ... Sliding unit (interval adjusting means), 7 ... Rotating spindle (grinding wheel rotating shaft), 15 ... Oscillating shaft, 16 ... Sliding Base, 17 ...
Servo motor, 22 ... Servo motor (oscillating means), 2
3, 24, 25 ... Rocker arm holding means, 23 ...
Shaft member, 24 ...... Pressing lever (pressing member), 25 ... Positioning member, 26 ... Rocker arm shaft hole, 32 ...
Adjustment screw, 43 ... Moving table, 44 ... Carry-in loader, 45 ... Carry-out loader, WW ... Swing axis, Z ...
… Vertical plane, h… Polishing surface width

Claims (8)

[Claims] 1. A grindstone-side unit including a disk-shaped grindstone wheel that is rotationally driven, a jig-side unit including a swingable jig that holds a rocker arm, and a transfer unit that transfers the rocker arm. The rocker arm transported by the transport means is loaded into and unloaded from the jig of the jig side unit, and the whetstone side unit, the jig side unit, and the loading / unloading means are associated with each other. And an automatic control means for automatically controlling the drive, wherein the grinding wheel has a polishing surface formed on a side surface thereof which is a plane perpendicular to the axis of the grinding wheel rotating shaft, The tool has a rocker arm holding means for holding a slipper surface of a rocker arm so as to face the polishing surface, and a swing axis line of a swing shaft of the jig is arranged parallel to the polishing surface. Along with And is arranged so as to be perpendicular to the polishing surface and in a plane including a contact line between the polishing surface and the slipper surface, and the swing shaft reciprocates the jig within a set rotation angle range. Interval adjustment means coupled to a swinging means for rotating, and one of the grindstone-side unit and the jig-side unit variably adjusts the distance between the polishing surface of the grinding wheel and the swing axis of the jig. Includes rocker arm slipper face radius processing equipment. 2. The apparatus for rounding a slipper surface of a rocker arm according to claim 1, wherein the gap adjusting means is provided in the grindstone side unit, and the gap adjusting means includes a spindle unit including the grindstone wheel. A sliding unit comprising a sliding base for supporting and a servomotor for sliding the sliding base in the direction of the grinding wheel rotating shaft. 3. The rocker arm slipper surface rounding apparatus according to claim 1, wherein the loading / unloading means is movable in the grinding wheel rotation axis direction and in a direction perpendicular thereto. A loading / unloading robot including a loading loader and a loading loader provided on a moving table. 4. A device for rounding a slipper surface of a rocker arm according to claim 1, wherein the automatic control means is an NC controller. 5. The device for rounding a slipper surface of a rocker arm according to claim 1, wherein the polishing surface is a circular polishing surface formed on the entire one side surface of the grinding wheel, and the swing shaft. Is movable in the radial direction of the polishing surface orthogonal to the contact line between the polishing surface and the slipper surface. 6. The rounding device for a slipper surface of a rocker arm according to claim 1, wherein the polishing surface is formed with a predetermined polishing surface width all around the outer peripheral edge of one side surface of the grinding wheel. Those that have an annular polishing surface. 7. A device for rounding a slipper surface of a rocker arm according to claim 6, wherein the polishing surface width h of the annular polishing surface is such that the outer diameter of the annular polishing surface is 2r and the annular polishing surface is When the central angle of the grinding wheel that sandwiches two points where the outer diameter line of the surface intersects the contour lines at both ends in the width direction of the slipper surface is represented by the following formula. h = 2rsin ² θ / 4 8. The rocker arm slipper surface rounding apparatus according to claim 1, wherein the rocker arm holding means includes a shaft member, a pressing member, and a positioning member provided on an upper surface of the jig. The shaft member is fitted into a shaft hole provided in a longitudinally intermediate portion of the rocker arm to pivotally support the rocker arm, and the pressing member has one end on the back surface of the rocker arm. The one end portion is elastically biased toward the grinding wheel side by being locked to the side portion, and the positioning member has an adjusting screw screwed into the positioning member, and the tip of the adjusting screw is It is designed to be locked on the opposite side of the back of the rocker arm.