JPH11347934A - Cooling liquid supplying device for grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling liquid supplying device for properly supplying a cooling liquid to the grinding point as contacting point of a pin with a grinding wheel in a grinder machine which performs grinding in such a condition that the grinding point is revolved up and down and to the front and rear by the rotation of a crank shaft. SOLUTION: A grinding wheel 14 is supported reciprocatively fore and aft by a wheel rest advancing/retreating mechanism 15, and a revolving mechanism 20 is installed to revolve a pin 18 where the journal part 17 of a crank shaft 16 is supported ahead of the grinding wheel 14. The grinding wheel 14 is advanced and retreated while the pin 18 is revolved round the journal part 17, and the peripheral surface of the pin 18 revolving is ground by the grinding wheel 14. The facing of a nozzle 22 in a cooling liquid supplying device 21 is inclined along with advancing and retreating made by servo motors 28 and 31, and the cooling liquid is supplied correctly to the grinding point under control into the tangential direction of the grinding wheel passing the grinding point P1 of the pin 18 varying from time to time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coolant supply device for a grinding machine suitable for grinding a crankshaft, for example.

[0002]

2. Description of the Related Art In general, a crankshaft used for an automobile engine or the like is composed of a plurality of journals and a plurality of pins connected to positions eccentric from the center of each journal. Conventionally, when grinding the pin portion of the crankshaft, both ends of the journal portion of the crankshaft are gripped by the main shaft of the work gripping mechanism and the tailstock, and the journal portion is rotated around the pin portion to be ground. I was trying to make a turn. Then, the grinding wheel is brought into contact with the outer peripheral surface of the pin portion rotated at the predetermined position to grind the outer peripheral surface of the pin portion. Therefore, the grinding point facing the grinding wheel is maintained at the fixed position without change.

When the diameter of the grinding wheel is reduced due to the wear of the grinding wheel, the direction of the nozzle is changed, or the nozzle is moved by the amount of wear of the grinding wheel in parallel with the moving direction of the grinding wheel base. .

In the above-described grinding method, since the journal portion is turned, an indexing device for the position of the pin portion to be ground is required, and the indexing device becomes large. If the turning speed is increased to increase the grinding efficiency, the spindle turning mechanism for turning the journal part eccentrically becomes large. For this reason, in recent years, in a grinding operation of a pin portion of a crankshaft, a method of grinding by moving a grinding wheel back and forth while rotating the pin portion around a journal portion has been adopted.
Therefore, while the pin portion makes one turn, the grinding point between the pin portion and the grinding wheel moves in the vertical direction and the front-back direction every moment.
In such a grinding method as well, the supply device for supplying the cooling liquid from the nozzle is such that the cooling liquid nozzle 52 is synchronized with the forward and backward movement of the grinding wheel 51 as shown by a two-dot chain line as in the conventional method shown in FIG. A structure that swings and follows the grinding points P1, P2, P3, and P4 is employed.

[0005]

In the above-described conventional coolant supply apparatus shown in FIG. 8, only the coolant nozzle 52 swings, and the grinding point of the grinding wheel 51 is changed with the rotation of the pin W. P1 → P2 → P3 → P4, and the grinding point facing the grinding wheel 51 moves up and down. For this reason, the grinding direction of the grinding wheel 51 at the grinding point, that is, the tangential direction of the grinding wheel 51 passing through the grinding points P1 to P4 changes, but the direction in which the coolant is discharged by the nozzle 52 has no relation to the change in the grinding direction. , The pointing direction of the nozzle 52 is not properly adjusted. For example, the pin portion W
In the case where the grinding point Pn is located at the lowermost position P2 as shown by the chain line in FIG. 8, the pointing direction of the nozzle 52 becomes a shadow of the pin portion W, and the nozzle 52 cannot properly point the grinding point P2. ,
There has been a problem that the supply of the cooling liquid is insufficient, and the grinding burn of the work and the grinding accuracy are reduced.

A conventional example as shown in FIG. 9 has also been proposed. In this conventional example, a grindstone cover 56 that covers the grinding wheel 51 is provided on the upper surface of a grindstone table 55, and a mechanism 57 for moving the nozzle 52 back and forth is provided on the upper surface of the cover 56.

In the above conventional example, the position of the nozzle 52 is moved in the front-rear direction in accordance with the change of the grinding points P1 to P4 due to the turning of the crank pin portion W. , Grinding point P1 by grinding wheel 51
It is not possible to cope with the change in the grinding direction of the grinding wheel 51 due to the change of P4, the cooling liquid cannot be sufficiently supplied to the grinding point, and there is a problem that the workpiece is burnt or the grinding accuracy is reduced. .

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to appropriately supply a coolant to a grinding point when the grinding point of a workpiece by a grinding wheel fluctuates vertically and longitudinally. It is an object of the present invention to provide a cooling liquid supply device that can be used.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, both ends of a work are gripped and rotated by a work gripping mechanism, and the work is held in a radial direction from a rotation axis of the work. The grinding wheel is configured to move the grinding wheel back and forth to the ground portion located at a position displaced in the forward and backward directions so as to be able to move forward and backward, and the coolant to the ground portion is mounted on a grinding wheel table on which the grinding wheel is mounted. In a grinding machine equipped with a nozzle to be supplied, a nozzle directing means for directing a nozzle of the cooling liquid to a grinding point of the part to be ground is provided in synchronization with turning of the part to be ground, and the nozzle directing means is provided with: A forward / backward moving mechanism for moving the nozzle back and forth, a nozzle tilting mechanism supported by a saddle constituting the forward / backward moving mechanism, and tilting the nozzle in opposition to the grinding wheel, and an operation of the nozzle forward / backward moving mechanism and the nozzle tilting mechanism. Nozzle in front And a control unit for controlling so as to direct the grinding point.

According to a second aspect of the present invention, in the first aspect, the nozzle directing means includes an elevating mechanism for elevating and lowering the nozzle, and the nozzle elevating mechanism is a control device together with a nozzle tilting mechanism and a nozzle forward / backward moving mechanism. Is controlled so that the nozzle is directed to the grinding point.

According to a third aspect of the present invention, in the first or second aspect, the control device controls the operation of the nozzle pointing means so that the nozzle is directed in a designated direction at a grinding point of the grinding wheel. It is.

[0012] In the invention described in claim 4, in claim 2, the control device is arranged such that the nozzle is directed in a designated direction at a grinding point of the grinding wheel, and that the nozzle extends from the grinding point to the tip of the nozzle. The operation of the nozzle directing means is controlled so that the distance becomes constant.

[0013] In the invention described in claim 5, in claim 3 or 4, the control device changes the directional direction of the nozzle.
The control is performed in the tangential direction passing through the grinding point of the grinding wheel.
In the invention according to claim 6, in claim 3 or 4,
The control device is based on operation program data of a forward / reverse mechanism for moving a grinding wheel back and forth, and displacement data of a coordinate position in a vertical plane of a grinding point determined by operation program data of a turning mechanism of a part to be ground. Thus, the operation of the nozzle directing means is controlled.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, a grinding wheel cover 12 is provided on the upper surface of the grinding wheel base 11,
A grinding wheel 14 attached to a drive shaft 13 rotated by a motor (not shown) is housed inside the grinding wheel cover 12. The grindstone cover 12 and the grindstone wheel 14 can reciprocate in the front-rear direction toward a crankshaft 16 which is a work to be ground by a grindstone head back-and-forth moving mechanism 15 for moving the grindstone head 11 back and forth.

A crankshaft 16 to be ground is gripped by a work gripping mechanism (not shown) in front of the grinding wheel 14, that is, to the left in FIG. The crankshaft 16 includes a journal portion 17 and the journal portion 17.
And a crank pin portion 18 as a portion to be ground connected to a position eccentric by a predetermined distance from the center O1 position. Then, the journal portion 17 is gripped by a spindle (not shown) and a tailstock, and the crankshaft 1 is held.
6 is rotated at a predetermined position, the crank pin 1
Reference numeral 8 is adapted to be turned at a predetermined turning radius. The turning mechanism 20 of the crank pin section 18 turns the crank pin section 18 at a predetermined turning speed. Then, in synchronization with the turning operation of the crank pin portion 18, the grindstone head back-and-forth moving mechanism 15 is drive-controlled, so that the grinding wheel 14 is moved back and forth, and the pin portion 18 is ground by the grinding wheel 14. ing.

A coolant supply device 21 for supplying coolant is provided above the grinding wheel cover 12. The supply device 21 includes a nozzle forward / backward movement mechanism K1 that reciprocates a nozzle 22 that discharges a coolant in the front-rear direction,
Tilting mechanism K2 for tilting the rotary shaft 32 about the rotary shaft 32
It is composed of Therefore, the nozzle forward / reverse mechanism K
1 will be described. A mounting frame 23 is fixed to the upper surface of the grindstone cover 12, and bearings 2 are provided before and after the frame 23.
A feed screw 25 is rotatably supported at a predetermined position via 4 and 24. This feed screw 25 has a forward / backward saddle 2
6 is fitted via a nut member 27. The forward / reverse saddle 26 can be guided and moved in the front-rear direction by the upper surface 12a of the grindstone cover 12 and the vertical surface 23a of the mounting frame 23 as shown in FIG. The rear end of the feed screw 25 is connected via a joint 30 to a rotation shaft 29 of a servomotor 28 fixed to the upper surface of the cover 12. Then, when the motor 28 is rotated, the feed screw 25 is rotated, and the forward-reverse saddle 26 is reciprocated in the front-rear direction by the nut member 27.

Next, a description will be given of the nozzle tilting mechanism K2 mounted on the forward / reverse saddle 26 of the nozzle forward / backward mechanism K1. As shown in FIG. 5, a servomotor 31 is attached to the upper surface of the forward / reverse saddle 26, and a base end of the nozzle 22 is connected to a rotating shaft 32 of the motor 31. A flexible pipe 33 for supplying a cooling liquid to the nozzle 22 is connected to a base end of the nozzle 22. Then, the nozzle 22 is supplied from a cooling liquid supply source (not shown).
Can be supplied with a cooling liquid.

In this embodiment, the nozzle forward / reverse mechanism K
1 and the nozzle tilting mechanism K2 constitute the directing means of the nozzle 22. Next, referring to FIG. 6, a control device 35 for controlling the grinding operation of the grinding machine and the operation of the cooling liquid supply device 21 will be described.
Will be described.

The control unit 35 includes a central processing unit (C)
PU) 36, and the CPU 36 has a read only memory (ROM) 37 and a random access memory (RA).
M) 38 is connected. A drive circuit 40 is connected to the CPU 36 via an interface 39, and the servo motor 31 for tilting the nozzle 22 is connected to the drive circuit 40. The interface 39 is also connected to the servo motor 28 for operating the forward / backward saddle 26 via a drive circuit 40. An operation panel 41 for inputting various data is connected to the interface 39. In addition, interface 3
Reference numeral 9 denotes a servomotor 42 that constitutes the grinding wheel back-and-forth moving mechanism 15 for operating the grinding wheel head 11 via the drive circuits 40 and 40, and a turning mechanism 20 for turning the pin portion 18 of the crankshaft. Servo motors 43 are respectively connected. The CPU 36 controls the servo motor 31 by inputting the directional angle of the nozzle 22 with respect to the grinding point P1 from the operation panel 41 to calculate the directional angle of the nozzle 22 in accordance with the change in the grinding point.

Next, the operation of the cooling liquid supply device in the grinding machine configured as described above will be described. FIG.
Is that the crank pin portion 18 of the crank shaft 16 has the rotation center O 1 of the journal portion 17 and the drive shaft 13 of the grinding wheel 14.
The figure shows a case where it is located on a line connecting the rotation centers of. In this state, the grinding operation is started, the crank pin 18 is turned in the direction of arrow A about the rotation center O1 of the journal 17 and the grinding wheel 14 is rotated in the direction of arrow B. The grinding wheel 14 is moved forward by the wheel head back-and-forth moving mechanism 15, and the grinding wheel 14 is always brought into contact with the turning of the crank pin portion 18, so that the grinding is started.

The crankshaft 16 is rotated about the center O1 of the journal portion 17 by the servomotor 43 of the turning mechanism 20, so that the crankpin portion 18 has a predetermined turning radius from the rotation axis O1 of the journal portion 17 in FIG. The vehicle is turned at a predetermined speed in the direction of arrow A. Further, the grinding wheel 14 is moved forward and backward by the servomotor 42 of the grinding wheel back-and-forth moving mechanism 15 with the turning operation of the crank pin portion 18 in the direction of the arrow B. For this reason, the crank pin portion 18
As shown in FIG. 1 to FIG. 4, the turning operation is performed at a predetermined turning radius and speed, and the grinding wheel 14 is brought into contact with the outer peripheral surface of the turning crank pin portion 18 so that the crank pin portion 1 is rotated.
8 is ground.

In the above-described grinding operation of the crankpin portion 18, the grinding point P1 shown in FIG. 1 is set to 90 ° when the crankpin portion 18 is turned by 90 ° below the rotation axis O1 as shown in FIG. It becomes P2. Further, as shown in FIG. 3, the turning point becomes P3 when turned 180 °, and the turning point becomes P4 when turned 270 ° as shown in FIG. Thus, the grinding point of the crank pin portion 18 is P1
Since it changes every moment at P4, the directivity direction and the front and rear positions of the tip portion 22a of the nozzle 22 are changed by the forward and reverse rotation of the servo motors 28 and 31 in synchronization with the rotation of the crank pin portion 18, and the coolant is ground. Properly supplied to points P1 to P4.

That is, for the grinding point P1 shown in FIG.
The nozzle 22 is moved so as to point in a position pointing to the grinding point P1, that is, in a specified tangential direction of the grinding wheel 14 passing through the grinding point P1. As shown in FIG. 2, when the grinding point P2 moves downward, the nozzle 22 is tilted counterclockwise about the rotation shaft 32 so as to be directed in the tangential direction of the grinding wheel 14 passing through the grinding point P2. You. Further, as shown in FIG. 3, when the grinding point P3 is farthest from P1, the nozzle 22 is moved so as to point in the tangential direction of the grinding wheel 14 passing through the grinding point P3. Similarly, when the grinding point P4 of the crank pin portion 18 has moved to the uppermost end as shown in FIG. 4, the nozzle 22 is moved so as to point in the tangential direction of the grinding wheel 14 passing through the grinding point P4. Therefore, even if the grinding points P1 to P4 change every moment in the vertical direction, the front-back direction, and the combined direction thereof, the coolant can be supplied from the nozzle 22 to the grinding points P1 to P4 in an appropriate direction. Perform the work properly, and
Grinding burn can be prevented and grinding accuracy can be improved.

In the above-described embodiment, the direction of the nozzle 22 changes every moment during the grinding operation. However, the pressure and the spray speed of the coolant sprayed from the nozzle 22 are controlled by the coolant at the grinding points P1 to P4. Is desirably set so as to be substantially linear toward.

Next, the operation and effect of the coolant supply device in the grinding machine of the above embodiment will be described. (1) In the above-described embodiment, the directional angle of the nozzle 22 is changed following the rotation of the crank pin portion 18 of the crank shaft 16 to change to the grinding points P1 to P4. Even if the grinding points P1 to P4 fluctuate in the vertical direction, the front and rear direction, and the combined direction thereof, the coolant is properly supplied from the nozzle 22 to the grinding points of the crankpin portion 18 at the grinding points P1 to P4. Thus, grinding burns and a decrease in hardness of the crank pin portion 18 can be prevented, and the grinding accuracy can be improved.

(2) In the above embodiment, the servo motor 2
The control of 8 and 31 changes the directional angle of the nozzle 22 to the grinding point P.
Since the grinding wheel 14 is directed in a specified tangential direction, for example, passing through the grinding wheels P1 to P4, the nozzle 22 can accurately follow the displacement of the grinding points P1 to P4 of the crank pin portion 18, and the cooling can be performed. The supply of the liquid grinding points P1 to P4 can be performed appropriately. In addition, the amount of coolant used can be reduced.

(3) In the above embodiment, the control device 3
5, the grinding points P1 to P1 determined by the operation program data of the forward and backward movement mechanism 15 for moving the grinding wheel 14 forward and backward and the operation program data of the turning mechanism 20 of the pin portion 18
Based on the displacement data of the coordinate position in the vertical plane of P4,
The operation of the nozzle forward / backward moving mechanism K1 and the nozzle tilting mechanism K2 is controlled. For this reason, it is possible to easily deflect the pointing direction of the nozzle 22 to the designated, for example, tangential direction of the grinding wheel 14 passing through the grinding points P1 to P4.

Next, another embodiment of the present invention will be described. In another embodiment shown in FIG. 7, the entire cooling liquid supply device 21 of the embodiment shown in FIG. 1 is supported by an elevating mechanism K3 so that the position in the vertical direction can be adjusted. That is, a column 45 is erected on the upper surface of the whetstone cover 12, and a servomotor 46 for elevating is provided on the upper end surface of the column 45.
Is installed facing down. A nut member 48 is screwed into a feed screw 47 rotated by the motor 46, and a lifting frame 49 is attached to the nut member 48. Further, the descending frame 49 is provided with the nozzle forward / backward moving mechanism K1 and the nozzle tilting mechanism K2.

In this cooling liquid supply device, since the attitude of the nozzle 22 can be controlled by the forward and backward moving mechanism K1, the tilting mechanism K2, and the elevating mechanism K3, the distance L between the nozzle tip 22a and the grinding points P1, P2, P3, and P4. Can always be constant. For this reason, since the attitude control of the nozzle 22 can be performed more appropriately, it is possible to more appropriately supply the coolant to the grinding points P1 to P4.

The above embodiments can be modified as follows. In the above embodiment, the grinding wheel 1 passes through the grinding points P1 to P4.
The attitude of the nozzle 22 is controlled in the tangential direction of No. 4, but the nozzle 22 is directed between the tangential direction and an inclined direction inclined at a predetermined angle (for example, 10 to 40 degrees) away from the tangential direction. Is also good.

In the above-described embodiment, the attitude of the nozzle 22 is controlled based on the displacement data of the coordinate positions of the grinding points P1 to P4 set in advance. When the turning radius of the pin portion 18 from the center O1 of the journal portion 17 to the center of the pin portion 18 and the turning speed of the pin portion 18 are input, the attitude control of the nozzle 22 is automatically performed based on these input data. It may be configured to be performed.

[0032]

As described above, according to the first aspect of the present invention, the coolant can be appropriately supplied to the grinding point when the grinding point of the workpiece by the grinding wheel fluctuates in the vertical and longitudinal directions.

In the invention according to any one of the second to sixth aspects, it is possible to more appropriately supply the coolant to the grinding point, which is the above effect. In the invention according to claim 4,
Since the nozzle is oriented in the specified direction at the grinding point of the grinding wheel, and the distance from the grinding point to the tip of the nozzle is made constant, the supply of the coolant to the grinding point is more appropriately performed. It can be carried out.

According to the fifth aspect of the present invention, since the nozzle is directed in the tangential direction at the grinding point of the grinding wheel, the coolant can be more appropriately supplied to the grinding point.

According to the sixth aspect of the present invention, the grinding point in the vertical plane is determined by the operation program data of the forward / reverse mechanism for moving the grinding wheel back and forth and the operation program data of the turning mechanism of the part to be ground. Since the operation of the nozzle directing means is controlled based on the displacement data of the coordinate position,
The attitude control of the nozzle can be more appropriately performed in synchronization with the coordinate displacement of the grinding point.

[Brief description of the drawings]

FIG. 1 is a front view of a coolant supply device for a grinding machine embodying the present invention.

FIG. 2 is a front view of a cooling liquid supply device.

FIG. 3 is a front view of a cooling liquid supply device.

FIG. 4 is a front view of a cooling liquid supply device.

FIG. 5 is a partial cross-sectional view of a cooling liquid supply device.

FIG. 6 is a block circuit diagram showing a control device of the cooling liquid supply device.

FIG. 7 is a front view showing another embodiment of the present invention.

FIG. 8 is a front view of a conventional cooling liquid supply device.

FIG. 9 is a front view of a conventional cooling liquid supply device.

[Explanation of symbols]

12: grinding wheel cover, 14: grinding wheel, 15: wheel head back-and-forth moving mechanism, 16: crankshaft, 17: journal part,
18: Pin portion as a portion to be ground, 20: Revolving mechanism, 21
... Cooling liquid supply device, 22 ... Nozzle, 28, 31 ... Servo motor, 35 ... Control device, 45 ... Support column, 46 ... Elevating servo motor, 47 ... Feed screw, 48 ... Nut member, 4
9: lifting frame, K1: nozzle forward / backward movement mechanism, K2: nozzle tilting mechanism, K3: nozzle lifting / lowering mechanism.

Claims (6)

[Claims] 1. A grinding machine in which both ends of a workpiece are gripped and rotated by a workpiece gripping mechanism, and a grinding wheel is moved back and forth to a grinding portion at a position displaced in a radial direction from a rotation axis of the workpiece so as to advance and retreat. In a grinding machine configured to grind a grinding part and a nozzle that supplies a cooling liquid to the part to be ground is mounted on a grindstone table on which the grinding wheel is mounted, the cooling is performed in synchronization with turning of the part to be ground. Providing nozzle directing means for directing the nozzle of the liquid to the grinding point of the part to be ground, the nozzle directing means, a forward and backward moving mechanism for moving the nozzle back and forth,
A nozzle tilting mechanism that is supported by a saddle that constitutes the forward / backward moving mechanism and tilts the nozzle in opposition to the grinding wheel, so that the operation of the nozzle forward / backward moving mechanism and the nozzle tilting mechanism is directed to the grinding point. A coolant supply device in a grinding machine, comprising a control device for controlling. 2. The nozzle pointing device according to claim 1, wherein the nozzle directing means includes an elevating mechanism for elevating and lowering the nozzle, and the nozzle elevating mechanism moves the nozzle to the grinding point by a control device together with a nozzle forward / backward mechanism and a nozzle tilting mechanism. A coolant supply device in a grinding machine that is controlled to be directed. 3. The coolant in a grinding machine according to claim 1, wherein the control device controls the operation of the nozzle directing means so that the nozzle is directed in a designated direction at a grinding point of the grinding wheel. Feeding device. 4. The control device according to claim 2, wherein the control unit controls the nozzle so that the nozzle is directed in a designated direction at a grinding point of the grinding wheel, and the distance from the grinding point to the tip of the nozzle is constant. A coolant supply device in a grinding machine for controlling the operation of the nozzle directing means. 5. The coolant supply device in a grinding machine according to claim 3, wherein the control device controls a direction of the nozzle in a tangential direction passing through a grinding point of a grinding wheel. 6. The grinding device according to claim 3, wherein the control device is configured to determine operation program data of a forward / reverse mechanism for moving the grinding wheel back and forth, and operation program data of a turning mechanism of the part to be ground. A coolant supply device in a grinding machine for controlling the operation of a nozzle directing unit based on displacement data of a coordinate position in a vertical plane.